MOTOR AND PUMP

CROSS-REFERENCE TO RELATED APPLICATIONS

The present invention claims priority under 35 U.S.C. § 119 to Japanese Application No. 2022-212481 filed on Dec. 28, 2022, the entire content of which is incorporated herein by reference.

BACKGROUND
Field of the Invention

The disclosure provides a motor and a pump.

Background

A motor is known in which a stator winding included in a stator and a circuit board that supplies power to the stator winding are electrically connected via a guide plate. For example, there is known a motor having a structure for electrically connecting a stator winding and a circuit board by a guide plate held by a stator fixed to a motor housing.

In such a motor as described above, if the stator is fixed to the motor housing with its circumferential position displaced with respect to the motor housing, the circumferential position of the guide plate with respect to the circuit board is displaced. In this case, since the circumferential position of the guide plate cannot be aligned with the circuit board, there is a possibility that the connection between the guide plate and the circuit board becomes difficult. Thus, when the stator is mounted on the motor housing, it is necessary to increase the positional accuracy of the stator in the circumferential direction with respect to the motor housing, and this increases the number of manufacturing man-hours of the motor.

One of the purposes of this disclosure is to provide a motor and a pump that are able to suppress an increase in manufacturing man-hours in light of the above circumstances.

SUMMARY

One embodiment of the motor of this disclosure includes: a motor part having a rotor rotatable about the central axis, and a stator facing the rotor in a radial direction with a gap therebetween; a circuit board arranged on an axial one side of the motor part; a connection terminal arranged between the stator and the circuit board in an axial direction; and a motor housing having a cylindrical shape that extends in the axial direction and accommodating the motor part. The stator includes: an annular stator core; a coil having multiple coil bodies attached to the stator core; and an insulator arranged between the stator core and the coil. The connection terminal electrically connects the coil and the circuit board. The motor includes a terminal holder, which holds the connection terminal and is mounted on either the stator or the motor housing and moveable in the circumferential direction.

One embodiment of the pump includes motor and a pump mechanism connected to the rotor.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view showing a pump of a first embodiment.

FIG. 2 is a cross-sectional view of the pump of the first embodiment.

FIG. 3 is a top view showing a portion of the pump of the first embodiment.

FIG. 4 is a first perspective view showing a portion of the pump of the first embodiment.

FIG. 5 is a second perspective view showing a portion of the pump of the first embodiment.

FIG. 6 is a cross-sectional view showing a portion of the pump of the first embodiment.

FIG. 7 is a perspective view showing a terminal holder of the first embodiment.

FIG. 8 is a third perspective view showing a portion of the pump of the first embodiment.

FIG. 9 is a second cross-sectional view showing a portion of the pump of the first embodiment.

FIG. 10 is a third cross-sectional view showing a portion of the pump of the first embodiment.

FIG. 11 is a perspective view showing a connection terminal of the first embodiment.

FIG. 12 is a fourth cross-sectional view showing a portion of the pump of the first embodiment.

FIG. 13 is a top view showing a portion of a pump of a second embodiment.

FIG. 14 is a cross-sectional view showing a portion of a pump of a third embodiment.

DETAILED DESCRIPTION

According to one embodiment of this disclosure, it is possible to suppress an increase in the manufacturing man-hours of a motor and a pump.

The above and other elements, features, steps, characteristics and advantages of the present disclosure will become more apparent from the following detailed description of the preferred embodiments with reference to the attached drawings.

In the following description, a Z-axis is shown as appropriate in the drawing. The Z-axis indicates the direction in which a central axis J of the embodiments described below extends. The central axis J shown in each drawing is a virtual axis. In the following description, the direction in which the central axis J extends, namely the direction parallel to the Z-axis, is referred to as “axial direction”. The radial direction centered on the central axis J is simply referred to as “radial direction”. The circumferential direction centered on the central axis J is simply referred to as “circumferential direction”. The side in the axial direction toward which the arrow of the Z-axis indicates (+Z side) is referred to as the “upper side” or “axial one side”. The side in the axial direction opposite to the side that the arrow of the Z-axis indicates (−Z side) is referred to as the “lower side” or the “axial other side”. Moreover, the upper side and the lower side are merely names for explaining relative positional relationship between respective parts, and the actual layout relationship or the like may be those other than the layout relationship or the like indicated by these names.

The circumferential direction is indicated by an arrow θ in each drawing. The side facing the arrow θ in the circumferential direction is referred to as “circumferential one side”. The side in the circumferential direction opposite to the direction that the arrow θ indicates is referred to as “circumferential other side”. The circumferential one side is a side that advances clockwise around the central axis J when viewed from the axial one side. The circumferential other side is a side that advances counterclockwise around the central axis J when viewed from axial one side.

First Embodiment

A pump 1 of this embodiment shown in FIG. 1 is an electric pump installed on a device mounted on a vehicle. The device on which the pump 1 is mounted may be an automatic transmission or a drive device for driving the axle of the vehicle. As shown in FIG. 2, the device on which the pump 1 is mounted is called a mounted body 5. The pump 1 is, for example, an electric oil pump for supplying oil to device installed on a vehicle.

The pump 1 includes a motor 2 and a pump mechanism 40. The motor 2 includes a housing 10, a motor part 3, a circuit board 70, a terminal holder 15, connection terminals 50, and a sealer 63.

The housing 10 accommodates the motor part 3, the circuit board 70, the terminal holder 15, the connection terminals 50, the sealer 63, and the pump mechanism 40 inside. The housing 10 includes a motor housing 11, a board accommodator 13, a lid 14, and a pump cover 19. The motor housing 11, the board accommodator 13, the lid 14, and the pump cover 19 are separate members from each other. The board accommodator 13 is fixed to the upper side of the motor housing 11. The lid 14 is fixed to the upper side of the board accommodator 13. The pump cover 19 is fixed to the lower side of the motor housing 11.

The motor housing 11 has a substantially cylindrical shape that extends in the axial direction centered on the central axis J. The motor housing 11 accommodates the motor part 3, the terminal holder 15, the connection terminals 50, the sealer 63, and the pump mechanism 40 inside. The motor housing 11 has a peripheral wall 11a, a bottom 11d, a shaft supporter 11e, a sealer holder 11g, and a pump mechanism accommodator 11h.

The peripheral wall 11a surrounds the motor part 3, the terminal holder 15, the connection terminals 50, and the sealer 63 from the radially outer side. The peripheral wall 11a has a cylindrical shape that extends in the axial direction centered on the central axis J. The upper side end of the peripheral wall 11a is the upper side end of the motor housing 11. The peripheral wall 11a has a first opening 11b that is open at the upper side, and a fixed recess 11c. The fixed recess 11c is a groove recessed from the outer peripheral surface of the peripheral wall 11a toward the radially inner side. The fixed recess 11c is provided in the upper portion of the peripheral wall 11a. In this embodiment, the fixed recess 11c is provided all around the outer peripheral surface of the peripheral wall 11a.

The bottom 11d has a substantially annular shape centered on the central axis J. The radial outer edge of the surface facing the upper side of the bottom 11d is connected to the lower end of the peripheral wall 11a in the axial direction. The shaft supporter 11e is a substantially cylindrical shape that protrudes toward the upper side. The lower portion in the outer peripheral surface of the shaft supporter 11e is connected to the inner peripheral surface of the bottom 11d in the radial direction. The shaft supporter 11e is open at the upper side and the lower side. The sealer holder 11g protrudes toward the upper side from a surface facing the upper side of the shaft supporter 11e. The sealer holder 11g has a substantially cylindrical shape centered on the central axis J. The sealer 63 is held on the inner peripheral surface of the sealer holder 11g.

The pump mechanism accommodator 11h accommodates the pump mechanism 40 inside. The pump mechanism accommodator 11h protrudes from the bottom 11d toward the lower side. The pump mechanism accommodator 11h has a substantially cylindrical shape that is open at the lower side centered on the central axis J. The inside of the pump mechanism accommodator 11h is connected to the inside of the peripheral wall 11a through the inside of the shaft supporter 11e.

The pump cover 19 has a substantially disk shape centered on the central axis J. The pump cover 19 is arranged on the lower side of the pump mechanism 40. The pump cover 19 is fixed to a lower portion in an inner peripheral surface of the pump mechanism accommodator 11h. The pump cover 19 closes the opening of the pump mechanism accommodator 11h from the lower side. The pump cover 19 is provided with a sucker 19a, a suction port 19b, and a discharge port 19c.

The sucker 19a is a columnar shape that protrudes toward the lower side from the pump cover 19. A groove is provided in the outer peripheral surface of the sucker 19a, and an O-ring 69 is fitted in the groove. The suction port 19b is a hole that passes through the pump cover 19 and the sucker 19a in the axial direction. The discharge port 19c is a hole passing through the pump cover 19 in the axial direction. The suction port 19b and the discharge port 19c respectively connect the inside of the pump mechanism accommodator 11h and the outside of the pump 1. In this embodiment, oil is sucked into the pump mechanism accommodator 11h through the suction port 19b, and the oil is discharged to the outside of the pump 1 through the discharge port 19c.

The board accommodator 13 accommodates the circuit board 70 inside. The board accommodator 13 holds the circuit board 70. The board accommodator 13 is fixed to the upper end of the motor housing 11. The board accommodator 13 has a substantially annular shape centered on the central axis J. In this embodiment, the board accommodator 13 is made of resin. The board accommodator 13 has a board accommodating part 13a, a board holder 13f, a fixing claw 13b, and a flange 13c.

The board accommodating part 13a has a substantially annular shape centered on the central axis J. The board accommodating part 13a surrounds the circuit board 70 from the radially outer side. The board accommodating part 13a has a second opening 13i that is open at the lower side, and a third opening 13j that is open at the upper side. The inside of the motor housing 11 and the inside of the board accommodator 13 are connected through the first opening 11b and the second opening 13i. A step having a step surface 13e facing the upper side is provided on the inner side surface of the board accommodating part 13a. A groove is provided in the outer peripheral surface of the board accommodating part 13a, and an O-ring 67 is fitted in the groove.

The board holder 13f holds the circuit board 70. The board holder 13f protrudes toward the upper side from the step surface 13e. As shown in FIG. 3, in this embodiment, the board accommodator 13 has multiple board holders 13f. In this embodiment, the board accommodator 13 has three board holders 13f. The board holders 13f are arranged at substantially equal intervals along the circumferential direction. Each board holder 13f has a supporter 13g and an insertion part 13h. As shown in FIG. 2, the supporter 13g has a disk shape that protrudes toward the upper side from the step surface 13e. The plate surface of the supporter 13g faces the axial direction. The insertion part 13h has a columnar shape that protrudes toward the upper side from the supporter 13g. As shown in FIG. 3, the outer diameter of the insertion part 13h is smaller than the outer diameter of the supporter 13g.

As shown in FIG. 2, the fixing claw 13b protrudes toward the lower side from the board accommodating part 13a. The fixing claw 13b is arranged further on the radially outer side than the peripheral wall 11a. The tip of the fixing claw 13b protrudes toward the radially inner side. In this embodiment, the board accommodator 13 has multiple fixing claws 13b. Although not shown, in this embodiment, the board accommodator 13 has fourteen fixing claws 13b. As shown in FIG. 4, the fixing claws 13b are arranged at intervals along the circumferential direction. As shown in FIG. 2, the tip of each fixing claw 13b is located inside the fixed recess 11c of the motor housing 11. Since each fixing claw 13b is elastically deformable toward the radially inner side, it is possible to prevent the tip of each fixing claw 13b from coming off from the inside of the fixed recess 11c. Thereby, the board accommodator 13 is fixed to the motor housing 11.

As shown in FIG. 4, the flange 13c protrudes toward the radially outer side from the board accommodating part 13a. When viewed in the axial direction, the flange 13c has a substantially triangular shape with one corner protruding toward the radially outer side. The flange 13c is provided with a flange hole 13d penetrating through the flange 13c in the axial direction. A collar 83 with a cylindrical shape that extends in the axial direction is fixed to the flange hole 13d. In this embodiment, the board accommodator 13 has multiple flanges 13c. In this embodiment, the board accommodator 13 has two flanges 13c. The flanges 13c are provided at positions facing each other in the radial direction. When a bolt (not shown) is passed through the inside of the collar 83 from the upper side and the bolt is tightened in a screw hole (not shown) provided in the mounted body 5, each flange 13c is fixed to the mounted body 5, as shown in FIG. 2. Thereby, the motor 2 and the pump 1 are fixed to the mounted body 5.

The lid 14 has a lid part 14a and a connector accommodator 14e. The lid part 14a has a substantially cylindrical shape that protrudes in the axial direction centered on the central axis J. The lid part 14a is open at the lower side. The lid part 14a is fixed to the upper end of the board accommodator 13. Thereby, the lid 14 is fixed to the board accommodator 13. The lid part 14a covers the third opening 13j from the upper side.

As shown in FIG. 1, the connector accommodator 14e protrudes toward the upper side from the lid part 14a. The connector accommodator 14e has a substantially square tubular shape that is open at both the upper side and the lower side. The inside of the connector accommodator 14e is connected to the inside of the lid 14 through a hole (not shown) that passes through the lid part 14a in the axial direction.

As shown in FIG. 2, the motor part 3 is accommodated inside the motor housing 11. In the axial direction, the motor part 3 is arranged below the circuit board 70 and above the pump mechanism 40. The motor part 3 has a rotor 20 and a stator 30.

The rotor 20 is rotatable about the central axis J. The rotor 20 includes a rotor core 21, a magnet 22, and a shaft 23. The magnet 22 and the shaft 23 are fixed to the rotor core 21. The rotor 20 is supported rotatably around the central axis J by an inner peripheral surface of the shaft supporter 11e supporting the shaft 23. The shaft 23 has a columnar shape that extends in the axial direction centered on the central axis J. The shaft 23 is passed through the inside of the shaft supporter 11e in the axial direction, and is arranged across the inside of the peripheral wall 11a and the inside of the pump mechanism accommodator 11h.

The stator 30 is arranged on the radially outer side of the rotor 20. The stator 30 faces the rotor 20 in the radial direction with a gap. The stator 30 has a stator core 31, an insulator 32, and a coil 33.

The stator core 31 is annular surrounding the rotor core 21 from the radially outer side. The outer peripheral surface of the stator core 31 is fixed to the peripheral wall 11a of the motor housing 11. In this embodiment, the stator core 31 is press-fitted into the peripheral wall 11a. The stator core 31 may be fixed to the peripheral wall 11a by other methods such as bonding.

The insulator 32 is attached to the stator core 31. The insulator 32 is arranged between the stator core 31 and the coil 33. The insulator 32 insulates the stator core 31 and the coil 33. The insulator 32 has an annular wall 32a protruding toward the upper side. In the axial direction, the annular wall 32a is arranged between the stator core 31 and the circuit board 70. The annular wall 32a has a substantially annular shape centered on the central axis J. The annular wall 32a faces the peripheral wall 11a in the radial direction. The outer side surface of the annular wall 32a constitutes an upper portion in the outer side surface of the stator 30. That is, the outer side surface of the annular wall 32a is a portion of the outer side surface of the stator 30. As shown in FIG. 5, the annular wall 32a is provided with an insertion notch 32c, a recess 32e, and a mounting recess 30a.

The insertion notch 32c is a hole recessed from the upper end of the annular wall 32a toward the lower side. The insertion notch 32c is open at both sides in the radial direction. When viewed in the radial direction, the insertion notch 32c has a substantially rectangular shape. In this embodiment, multiple insertion notches 32c are provided in the annular wall 32a. Although not shown, in this embodiment, six insertion notches 32c are provided in the annular wall 32a. The insertion notches 32c are provided at intervals along the circumferential direction. In this embodiment, each pair of insertion notches 32c are arranged at substantially equal intervals along the circumferential direction. The two insertion notches 32c constituting the pair of insertion notches 32c are arranged at intervals along the circumferential direction.

The recess 32e is a hole recessed from a surface facing the upper side of the annular wall 32a toward the lower side. The recess 32d is open at both sides in the radial direction. When viewed in the radial direction, the recess 32d has a substantially rectangular shape. Although not shown, in this embodiment, three recesses 32e are provided in the annular wall 32a. The recesses 32e are provided at substantially equal intervals along the circumferential direction. In the circumferential direction, each recess 32e is provided between the pair of insertion notches 32c.

The mounting recess 30a is a hole recessed from the outer side surface of the annular wall 32a toward the radially inner side. That is, the mounting recess 30a is a hole recessed from the outer side surface of the stator 30 toward the radially inner side. The mounting recess 30a is open at both sides in the axial direction. The mounting recess 30a extends in the circumferential direction. When viewed in the radial direction, the mounting recess 30a has a substantially rectangular shape. The mounting recess 30a has two restriction surfaces 30b. One of the restriction surfaces 30b faces a circumferential one side (+θ side), and the other of the restriction surfaces 30b faces a circumferential other side (−θ side). In this embodiment, the restriction surface 30b has a planar shape. Moreover, the restriction surface 30b may be a tapered surface located on the circumferential one side or the circumferential other side as it goes toward the upper side, or may be curved.

In this embodiment, multiple mounting recesses 30a are provided in the annular wall 32a. In this embodiment, three mounting recesses 30a are provided in the annular wall 32a. The mounting recesses 30a are arranged at substantially equal intervals in the circumferential direction. In the circumferential direction, each mounting recess 30a is provided between the pair of insertion notches 32c and the other pair of insertion notches 32c. As shown in FIG. 6, a support surface 32b facing the lower side, namely the axial other side, is provided on the outer side surface of the annular wall 32a. That is, the support surface 32b is provided on the outer side surface of the insulator 32. Although not shown, in this embodiment, three support surfaces 32b are provided on the annular wall 32a. Each support surface 32b is a surface facing the lower side in the inner side surface of a different mounting recess 30a.

The coil 33 is electrically connected to the circuit board 70 through the connection terminal 50. Power is supplied to the coil 33 from the circuit board 70 through the connection terminal 50. As shown in FIG. 2, the coil 33 has multiple coil bodies 33a and coil lead-out wires 33c.

The multiple coil bodies 33a are attached to the stator core 31. The multiple coil bodies 33a are arranged further on the radially inner side than the annular wall 32a. As shown in FIG. 3, in this embodiment, the coil 33 has six coil bodies 33a. The coil bodies 33a are arranged at intervals along the circumferential direction.

The coil lead-out wire 33c is connected to the connection terminal 50. As shown in FIG. 5, the coil lead-out wire 33c is led out from the coil body 33a. Although not shown, in this embodiment, the coil 33 has six coil lead-out wires 33c. Each coil lead-out wire 33c is led out from a different coil body 33a. Each coil lead-out wire 33c is led out from the coil body 33a to the radially outer side of the annular wall 32a via a different insertion notch 32c. The path where each coil lead-out wire 33c is arranged and the connection structure of each coil lead-out wire 33c and the connection terminals 50 will be described in detail latter.

As shown in FIG. 2, the sealer 63 is held on the inner peripheral surface of the sealer holder 11g. The sealer 63 is arranged on the lower side than the rotor core 21. In this embodiment, the sealer 63 is a lip seal having a lip on the radially inner side. The lip of the sealer 63 is brought into contact with the outer peripheral surface of the shaft 23. Thereby, the sealer 63 seals between the shaft 23 and the motor housing 11.

The pump mechanism 40 is accommodated inside the pump mechanism accommodator 11h. The pump mechanism 40 has an inner rotor 41 and an outer rotor 42. The inner rotor 41 is connected to a portion in the shaft 23 protruding into the pump mechanism accommodator 11h. Thereby, the pump mechanism 40 is connected to the rotor 20. The inner rotor 41 has an annular shape that surrounds the shaft 23. The outer rotor 42 has an annular shape that surrounds the inner rotor 41. The inner rotor 41 and the outer rotor 42 are engaged with each other. Thereby, when the rotor 20 rotates around the central axis J, the inner rotor 41 and the outer rotor 42 also rotate around the central axis J.

The circuit board 70 is electrically connected to the coil 33 through the connection terminal 50. The circuit board 70 controls power to be supplied to the coil 33. As described above, the circuit board 70 is accommodated inside the board accommodating part 13a. The circuit board 70 is arranged on the upper side, namely the axial one side, of the motor part 3. The circuit board 70 is arranged on the lower side of the lid 14. The circuit board 70 has a plate shape that spreads in a direction perpendicular to the axial direction. As shown in FIG. 4, when viewed in the axial direction, the circuit board 70 has a substantially circular shape. The circuit board 70 is provided with multiple first via holes 70a and multiple second via holes 70b. Moreover, a connector 72 is mounted on the circuit board 70.

Each of the multiple first via holes 70a is a hole that passes through the circuit board 70 in the axial direction. In this embodiment, three first via holes 70a are provided. The first via holes 70a are arranged at substantially equal intervals along the circumferential direction. The insertion part 13h of the board holder 13f is passed through each first via hole 70a in the axial direction. In this embodiment, the insertion part 13h is fitted into each first via hole 70a. Thereby, a circumferential position and a radial position of the circuit board 70 with respect to the board accommodator 13 are determined. Moreover, as shown in FIG. 2, a surface facing the lower side of the circuit board 70 is supported in the axial direction by the supporter 13g of the board holder 13f. Thereby, the axial position of the circuit board 70 with respect to the board accommodator 13 is determined. Thereby, the circuit board 70 is held in the board accommodator 13.

As shown in FIG. 4, the multiple second via holes 70b are holes passing through the circuit board 70 in the axial direction. The second via hole 70b is, for example, a through hole. A conductive copper foil is provided on the inner side surface of the second via hole 70b. In this embodiment, six second via holes 70b are provided. In this embodiment, each pair of the second via holes 70b is arranged at substantially equal intervals along the circumferential direction. The two second via holes 70b constituting a pair of the second via holes 70b are arranged at intervals in the circumferential direction.

The connector 72 electrically connects an external device (not shown) for supplying power to the motor 2 to the circuit board 70. The connector 72 is mounted on a surface facing the upper side of the circuit board 70 and protrudes toward the upper side. The upper portion of the connector 72 is arranged inside the connector accommodator 14e shown in FIG. 2.

As shown in FIG. 2, the terminal holder 15 is accommodated inside the motor housing 11. In the axial direction, the terminal holder 15 is arranged between the stator core 31 and the circuit board 70. As shown in FIG. 3, the terminal holder 15 has a substantially annular shape that surrounds the central axis J. The terminal holder 15 holds the connection terminal 50. In this embodiment, the terminal holder 15 is mounted on the insulator 32. That is, the terminal holder 15 is mounted on the stator 30. As shown in FIG. 7, the terminal holder 15 has a body 16, a terminal holding part 17, and a claw 18.

In this embodiment, the body 16 is a plate shape that extends in the circumferential direction. As shown in FIG. 8, the body 16 is arranged on the upper side, namely the axial one side, of the stator core 31. As shown in FIG. 7, in this embodiment, the body 16 is composed of three extension parts 16a. Each extension part 16a has a plate shape that extends in the circumferential direction centered on the central axis J. The plate surface of each extension part 16a faces the axial direction. When viewed in the axial direction, the outer side surfaces of each extension part 16a facing the radially outer side has an arc shape centered on the central axis J. When viewed in the axial direction, the inner side surface of each extension part 16a facing the radially inner side has an arc shape centered on the central axis J. When viewed in the axial direction, the angle defined by a straight line connecting the central axis J and the end of one extension part 16a on the circumferential one side (+θ side) and a straight line connecting the central axis J and the end of the extension part 16a on the circumferential other side (−θ side) is approximately 90°. The extension parts 16a are arranged at substantially equal intervals along the circumferential direction. Each extension part 16a has a notch 16b recessed in the radial direction.

In this embodiment, the notch 16b is recessed from the outer side surface of the extension part 16a toward the radially inner side. The notch 16b is open at the upper side and the lower side. In this embodiment, one extension part 16a is provided with two notches 16b. The two notches 16b provided in one extension part 16a are arranged at intervals along the circumferential direction. Moreover, each notch 16b may also be a hole recessed from the inner side surface of the extension part 16a toward the radially outer side.

The claw 18 has a plate shape that extends from the body 16 to the lower side, namely the axial other side. More specifically, the claw 18 extends from substantially the center in the circumferential direction of the extension part 16a to the lower side. As shown in FIG. 6, the claw 18 is arranged on the radially outer side of the annular wall 32a and on the radially inner side of the peripheral wall 11a. The plate surface of the claw 18 faces the radial direction. As shown in FIG. 7, in this embodiment, the terminal holder 15 has multiple claws 18. In this embodiment, the terminal holder 15 has three claws 18. The multiple claws 18 are arranged at substantially equal intervals along the circumferential direction.

As shown in FIG. 6, each claw 18 has a protrusion 18a that protrudes toward the radially inner side. The protrusion 18a protrudes toward the radially inner side from the lower edge of the claw 18. Each protrusion 18a is arranged inside a different mounting recess 30a. In this embodiment, each claw 18 is elastically deformable toward the radially outer side. Each support surface 32b comes into contact with the protrusion 18a in the axial direction and suppresses movement of the terminal holder 15 to the upper side. Moreover, the terminal holder 15 is supported on the upper surface of the insulator 32, and the movement toward the lower side is suppressed. Thereby, the terminal holder 15 is mounted on the stator 30.

Although not shown, in this embodiment, the circumferential dimension of each protrusion 18a of each claw 18 is the same as the circumferential dimension of each claw 18. As shown in FIG. 8, the circumferential dimension of each claw 18 is smaller than the circumferential dimension of the mounting recess 30a. That is, the circumferential dimension of each protrusion 18a is smaller than the circumferential dimension of the mounting recess 30a. Therefore, each pf the protrusions 18a is able to move in the circumferential direction inside the mounting recess 30a. Thereby, the terminal holder 15 is able to move in the circumferential direction with respect to the stator 30. When viewed in the circumferential direction, each protrusion 18a overlaps the restriction surface 30b of the mounting recess 30a. Therefore, when the terminal holder 15 is moved to the circumferential one side (+θ side) with respect to the stator 30, the end of the protrusion 18a on the circumferential one side comes into contact with the restriction surface 30b that faces the circumferential other side (−θ side). Conversely, when the terminal holder 15 is moved to the circumferential other side with respect to the stator 30, the end of the protrusion 18a on the circumferential other side comes into contact with the restriction surface 30b that faces the circumferential one side. Thereby, it is possible to regulate the moving distance of the terminal holder 15 in the circumferential direction with respect to the stator 30.

As shown in FIG. 7, the t terminal holding part 17 has a substantially rectangular parallelepiped shape that extends in the axial direction. The two outer side surfaces of the terminal holding part 17 face the radial direction. In this embodiment, the terminal holder 15 has multiple terminal holding parts 17. In this embodiment, the terminal holder 15 has three terminal holding parts 17. As shown in FIG. 8, each terminal holding part 17 holds the connection terminal 50. That is, the terminal holder 15 holds multiple connection terminals 50. In this embodiment, the terminal holder 15 holds three connection terminals 50. As shown in FIG. 7, the terminal holding parts 17 are arranged at substantially equal intervals along the circumferential direction. Each terminal holding part 17 is arranged between the extension parts 16a arranged adjacent to each other in the circumferential direction. The upper portion of each terminal holding part 17 is connected in the circumferential direction to each extension part 16a arranged adjacent to each other in the circumferential direction. The lower end of each terminal holding part 17 is located below the lower end of the body 16. As shown in FIG. 8, the lower portion of each terminal holding part 17 is arranged inside the recess 32e of the annular wall 32a. Each terminal holding part 17 is arranged between the coil bodies 33a adjacent to each other in the circumferential direction.

Thus, according to this embodiment, compared with a case where the terminal holding part 17 is arranged on the upper side of the coil body 33a, it is possible to suppress the terminal holder 15 from increasing in size in the axial direction. As a result, it is possible to suppress the motor 2 and the pump 1 from increasing in size in the axial direction. Moreover, compared with the case where the terminal holding part 17 is arranged further on the radially outer side than the coil body 33a, it is possible to suppress the terminal holder 15 from increasing in size in the radial direction. As a result, it is possible to prevent the motor 2 and the pump 1 from increasing in size in the radial direction.

As shown in FIG. 7, each terminal holding part 17 has a holding hole 17a and a groove 17c. Each terminal holding part 17 is provided with an outer wall 17e. The holding hole 17a is a hole recessed from the upper side of the terminal holding part 17, namely the surface facing axial one side, toward the lower side, namely the axial other side. Although not shown, when viewed in the axial direction, the holding hole 17a has a substantially rectangular shape with the long side extending in the circumferential direction. As shown in FIG. 9, when viewed in the radial direction, the holding hole 17a has a substantially rectangular shape. As shown in FIG. 10, when viewed in the circumferential direction, the holding hole 17a has a substantially rectangular shape.

As shown in FIG. 7, the groove 17c is a hole recessed from the upper side, namely the axial one side, of the terminal holding part 17 toward the lower side, namely the axial other side. The groove 17c is open at the radially inner side and the radially outer side. The groove 17c traverses the holding hole 17a in the radial direction. The inside of the groove 17c is connected to the inside of the holding hole 17a. When viewed in the radial direction, the shape of the groove 17c is line-symmetric with a virtual line (not shown) passing through the circumferential center of the terminal holding part 17 as a symmetric axis. When viewed in the radial direction, the width of the upper portion of the groove 17c in the circumferential direction decreases from the upper side toward the lower side. When viewed in the radial direction, the lower portion of the groove 17c in the radial direction has a long hole shape that extends from the upper side to the lower side with approximately the same circumferential dimension. When viewed in the radial direction, the lower end of the groove 17c has a semicircular shape that protrudes toward the lower side.

The outer wall 17e has a plate shape that extends in a direction perpendicular to the radial direction. When viewed in the radial direction, the outer wall 17e has a substantially rectangular shape with the long side extending in the axial direction. The outer wall 17e is arranged at a radial distance from the terminal holding part 17. When viewed in the radial direction, the circumferential center side of the outer wall 17e overlaps the groove 17c. The portions on the circumferential two sides of the outer wall 17e face the surface of the terminal holding part 17 facing the radially outer side. The lower edge of the outer wall 17e protrudes toward the radially inner side and is connected to the lower edge of the terminal holding part 17.

The connection terminal 50 electrically connects the coil 33 and the circuit board 70. As shown in FIG. 2, the connection terminal 50 is arranged between the stator 30 and the circuit board 70 in the axial direction. As shown in FIG. 8, the connection terminal 50 is held by the terminal holding part 17 of the terminal holder 15. In this embodiment, the motor part 3 has the multiple connection terminals 50. In this embodiment, the motor part 3 has three connection terminals 50. The connection terminals 50 are arranged at substantially equal intervals along the circumferential direction. The connection terminal 50 has conductivity. In this embodiment, the connection terminal 50 is made of metal. As shown in FIG. 11, the connection terminal 50 includes a terminal body 51, a connection part 52, a board connection part 53, and a board supporter 54.

The terminal body 51 extends in the axial direction. The terminal body 51 has a first terminal body 51a, a second terminal body 51b, and a third terminal body 51c. The first terminal body 51a has a plate shape that extends in the axial direction. The plate surface of the first terminal body 51a faces the radial direction. When viewed in the radial direction, the first terminal body 51a has a substantially rectangular shape. As shown in FIG. 10, the first terminal body 51a is arranged between the circuit board 70 and the terminal holder 15 in the axial direction. The upper end of the first terminal body 51a is the upper end of the terminal body 51. The second terminal body 51b has a plate shape that extends to the radially inner side from the lower end of the first terminal body 51a. The plate surface of the second terminal body 51b faces the axial direction. As shown in FIG. 11, when viewed in the axial direction, the second terminal body 51b has a substantially rectangular shape. The third terminal body 51c has a plate shape that protrudes toward the lower side from an end on the radially inner side of the second terminal body 51b. The plate surface of the third terminal body 51c faces the radial direction. When viewed in the radial direction, the third terminal body 51c has a substantially rectangular shape. As shown in FIG. 9, the third terminal body 51c is arranged above the terminal holding part 17. The lower end of the third terminal body 51c is the lower end of the terminal body 51.

The connection part 52 has a plate shape that extends from the lower end of the third terminal body 51c to the lower side. That is, the connection part 52 extends from the terminal body 51 to the lower side, namely the axial other side. The plate surface of the connection part 52 faces the radial direction. When viewed in the radial direction, the connection part 52 has a substantially rectangular shape with the long side extending in the axial direction. The connection part 52 is arranged inside the holding hole 17a of the terminal holding part 17. As shown in FIG. 10, the radial dimension of the connection part 52 is smaller than the radial dimension of the holding hole 17a. That is, the radial dimension of the holding hole 17a is larger than the radial dimension of the connection part 52. As shown in FIG. 11, the connection part 52 has a press-contact part 52a, a first part 52b, a second part 52c, first press-fit parts 52d and 52e, and second press-fit parts 52g and 52i.

The press-contact part 52a is a hole recessed from the lower side of the connection part 52, namely the axial other side, toward the upper side, namely the axial one side. The press-contact part 52a is open at the radially inner side and at the radially outer side, namely on both sides in the radial direction. As shown in FIG. 9, when viewed in the radial direction, the shape of the press-contact part 52a is line-symmetric with a virtual line (not shown) passing through the circumferential center of the connection part 52 as a symmetric axis. When viewed in the radial direction, the circumferential dimension of the lower portion of the press-contact part 52a decreases from the lower side toward the upper side. When viewed in the radial direction, the upper portion of the press-contact part 52a has a long hole shape that extends from the lower side to the upper side with approximately the same circumferential dimension. When viewed in the radial direction, the upper end of the press-contact part 52a has a semicircular shape that protrudes toward the upper side. As shown in FIG. 8, when viewed in the radial direction, the press-contact part 52a overlaps the groove 17c. Thus, a space on the radially outer side of the terminal holding part 17 and a space on the radially inner side of the terminal holding part 17 are connected via the press-contact part 52a and the groove 17c.

As shown in FIG. 12, when viewed in the axial direction, the surface of the press-contact part 52a facing the circumferential one side (+θ side) is located on the circumferential one side as it goes from the two ends in the radial direction toward the center in the radial direction, and a corner 52m is defined at an end on the circumferential one side. When viewed in the axial direction, the corner 52m has a sharp shape toward the circumferential one side. When viewed in the axial direction, the surface of the press-contact part 52a facing the circumferential other side (−θ side) is located on the circumferential other side as it goes from the two ends in the radial direction toward the center in the radial direction, and a corner 52n is defined at an end on the circumferential other side. When viewed in the axial direction, the corner 52n has a sharp shape toward the circumferential other side. The corners 52m and 52n face each other in the circumferential direction.

As shown in FIG. 11, the first part 52b is a portion in the connection part 52 further on the circumferential other side (−θ side) than the press-contact part 52a. The second part 52c is a portion in the connection part 52 further on the circumferential one side (+θ side) than the press-contact part 52a. The first part 52b and the second part 52c extend in the axial direction.

The first press-fit part 52d protrudes from a lower portion of the first part 52b to the circumferential other side (−θ side). The first press-fit part 52e protrudes from a lower portion of the second part 52c to the circumferential one side (+θ side). The dimension between the end of the first press-fit part 52d on the circumferential other side and the end of the first press-fit part 52e on the circumferential one side is smaller than the circumferential dimension of the holding hole 17a shown in FIG. 9. Thus, when the connection part 52 is inserted into the holding hole 17a, the first press-fit parts 52d and 52e are press-fitted into the holding hole 17a. Thereby, the connection part 52 is held in the holding hole 17a. Moreover, when the connection part 52 is inserted into the holding hole 17a, the first part 52b is elastically deformed to the circumferential one side, and the second part 52c is elastically deformed to the circumferential other side.

As shown in FIG. 11, the second press-fit part 52g protrudes from the upper edge of the first part 52b to the circumferential other side (−θ side). When viewed in the radial direction, the surface of the second press-fit part 52g facing the lower side is a tapered surface located on the upper side as it goes toward the circumferential other side. The surface facing the upper side of the second press-fit part 52g has a planar shape that faces the upper side. The end of the circumferential other side of the surface facing the upper side of the second press-fit part 52g is connected to the end of the circumferential other side of the surface facing the lower side of the second press-fit part 52g. The end of the second press-fit part 52g on the circumferential other side constitutes an edge 52h that is sharp toward the circumferential other side. The second press-fit part 52i protrudes from an upper edge of the second part 52c to the circumferential one side (+θ side). When viewed in the radial direction, the surface facing the lower side of the second press-fit part 52i is a tapered surface located on the upper side as it goes toward the circumferential one side. The surface facing the upper side of the second press-fit part 52i has a planar shape that faces the upper side. The end of the circumferential one side of the surface facing the upper side of the second press-fit part 52i is connected to the end of the circumferential one side of the surface facing the lower side of the second press-fit part 52i. The end of the second press-fit part 52i on the circumferential one side constitutes an edge 52j that is sharp toward the circumferential one side. The dimension between the edge 52h and the edge 52j is smaller than the circumferential dimension of the holding hole 17a shown in FIG. 9. As a result, when the connection part 52 is inserted into the holding hole 17a, the second press-fit parts 52g and 52i are press-fitted into the holding hole 17a. Moreover, when the connection terminal 50 is about to move toward the upper side with respect to the terminal holding part 17, the edges 52h and 52j are caught by the inner side surface of the holding hole 17a, so it is possible to suppress the movement of the connection terminal 50 toward the upper side with respect to the terminal holding part 17. Thus, it is possible to determine the axial position of the connection terminal 50 to the terminal holder 15 accurately.

As shown in FIG. 11, the board connection part 53 has a plate shape that protrudes from the terminal body 51 toward the upper side, namely the axial one side. The plate surface of the board connection part 53 faces the radial direction. When viewed in the radial direction, the board connection part 53 has a substantially elliptical shape with the major axis extending in the axial direction. The board connection part 53 is provided with a hole penetrating through the board connection part 53 in the radial direction. When viewed in the radial direction, the hole has a substantially elliptical shape with the major axis extending in the axial direction. Since a hole is provided in the board connection part 53, the board connection part 53 is elastically deformable in the circumferential direction. Since a hole is provided in the board connection part 53, the board connection part 53 is elastically deformable in a direction crossing the axial direction. In this embodiment, the connection terminal 50 has two board connection parts 53. One board connection part 53 protrudes toward the upper side from an edge on the circumferential other side (−θ side) of the terminal body 51. The other board connection part 53 protrudes toward the upper side from the circumferential one side (+θ side) of the terminal body 51. The two board connection parts 53 are arranged at intervals along the circumferential direction.

As shown in FIG. 4, the board connection part 53 of each connection terminal 50 is passed through the second via hole 70b of the circuit board 70 in the axial direction. Each board connection part 53 is press-fitted into the second via hole 70b. As described above, since the board connection part 53 is elastically deformable in the circumferential direction, each board connection part 53 is fixed to the second via hole 70b by the restoring force of the board connection part 53. Thereby, each board connection part 53 is connected to the circuit board 70. Since the board connection part 53 is connected to the circuit board 70, the board connection part 53 and the circuit board 70 are electrically connected. Thus, according to this embodiment, in the process of connecting the connection terminal 50 and the circuit board 70, it is possible to connect each board connection part 53 to the second via hole 70b of the circuit board 70 by a simple work of moving the circuit board 70 toward the lower side from the upper side of the connection terminal 50 held by the terminal holder 15 beforehand. As a result, since the connection terminal 50 and the circuit board 70 are able to be connected easily, it is possible to suppress an increase of assembling man-hours of the motor 2 and the pump 1.

As shown in FIG. 11, the board supporter 54 protrudes toward the upper side from the terminal body 51. The board supporter 54 is arranged between two board connection parts 53. When viewed in the radial direction, the board supporter 54 has a substantially triangular shape that protrudes toward the upper side. The upper side end of the board supporter 54 is located below the upper end of the board connection part 53. As shown in FIG. 9, the board supporter 54 contacts a surface facing the lower side of the circuit board 70 in the axial direction. Thereby, the board supporter 54 supports the circuit board 70 in the axial direction. As a result, it is possible to enhance the positional accuracy of the circuit board 70 in the axial direction with respect to the terminal holder 15 by the connection terminal 50.

As shown in FIG. 12, in this embodiment, two coil lead-out wires 33c are connected to the connection part 52 of each connection terminal 50. Each two coil lead-out wire 33c is led out from each of a pair of the coil bodies 33a arranged to sandwich each terminal holding part 17 in the circumferential direction.

As described above, the coil lead-out wire 33c is led out from the coil body 33a to the radially outer side of the annular wall 32a via a different insertion notch 32c. One coil lead-out wire 33c, which is led out to the radially outer side of the annular wall 32a from the coil body 33a arranged on the circumferential one side (+θ side) of the terminal holding part 17, is led out toward the circumferential other side (−θ side) toward the terminal holding part 17, passed through the gap between the terminal holding part 17 and the outer wall 17e toward the circumferential outer side, then bent toward the radially inner side, and passed in the radial direction through the inside of the groove 17c of the terminal holding part 17 and the inside of the press-contact part 52a of the connection terminal 50. The other coil lead-out wire 33c, which is led out from the coil body 33a arranged on the circumferential other side of the terminal holding part 17, is led out toward the circumferential one side toward the terminal holding part 17, passed through the gap between the terminal holding part 17 and the outer wall 17e toward the circumferential one side, then bent toward the radially inner side, and passed in the radial direction through the inside of the groove 17c and the inside of the press-contact part 52a.

In this embodiment, the dimension of the gap between the corners 52m and 52n of the press-contact part 52a is smaller than the diameter of the coil lead-out wire 33c. Moreover, as described above, the first press-fit parts 52d and 52e and the second press-fit parts 52g and 52i of the connection part 52 are press-fitted to the inner side surface of the holding hole 17a in the radial direction, respectively. Thus, two coil lead-out wires 33c are press-fitted into the press-contact part 52a of the connection part 52, and thereby the coil lead-out wires 33c and the connection part 52 are connected. That is, the connection part 52 is connected to the coil 33. That is, the connection terminal 50 and the coil 33 are connected. Moreover, as described above, the circuit board 70 is connected to the board connection part 53 of the connection terminal 50. Thereby, the connection terminal 50 electrically connects the coil 33 and the circuit board 70. Moreover, in this embodiment, even if each connection terminal 50 is arranged displaced with respect to the stator 30 in the circumferential direction, by adjusting the length of the coil lead-out wire 33c between the coil body 33a and the connection terminals 50 as appropriate, it is possible to easily connect the coil lead-out wire 33c to the connection terminals 50.

According to the motor 2 according to this embodiment, the stator 30 includes the annular stator core 31, the coil 33 having the multiple coil bodies 33a attached to the stator core 31, and the insulator 32 arranged between the stator core 31 and the coil 33. The connection terminal 50 electrically connects the coil 33 and the circuit board 70, and the motor 2 includes the terminal holder 15 that holds the connection terminal 50 and is mounted on the stator 30 and movable in the circumferential direction. In a configuration in which the connection terminal 50 connecting the coil 33 and the circuit board 70 is held by, for example, the insulator 32 of the stator 30, when the stator 30 is fixed to the motor housing 11 with its circumferential position displaced with respect to the motor housing 11, the circumferential position of the connection terminal 50 with respect to the circuit board 70 is displaced. Therefore, in a process of connecting the connection terminal 50 and the circuit board 70, there is a possibility that the connection between the connection terminal 50 and the circuit board 70 becomes difficult. On the other hand, in this embodiment, the connection terminal 50 is held by the terminal holder 15 moveable in the circumferential direction with respect to the stator 30, and so the circumferential position of the connection terminal 50 with respect to the circuit board 70 is able to be adjusted. Thus, it is possible to simplify the work of connecting the connection terminal 50 to the circuit board 70. Moreover, the work of connecting the connection terminal 50 to the circuit board 70 is facilitated, and workability is excellent. Moreover, as a result of adjusting the circumferential position of the connection terminal 50 with respect to the circuit board 70, even if the circumferential position of the connection terminal 50 is displaced with respect to the stator 30, by adjusting the length of the coil lead-out wire 33c between the coil body 33a and the connection terminal 50 as appropriate as described above, it is possible to easily connect the coil lead-out wire 33c to the connection terminal 50. Thus, it is possible to simplify the work of connecting the coil 33 to the connection terminal 50. As a result, in this embodiment, even if the stator 30 is fixed to the motor housing 11 with its circumferential position displaced with respect to the motor housing 11, it is possible to simplify the work of connecting the coil 33 and the circuit board 70 through the connection terminal 50. Thus, it is possible to suppress an increase of manufacturing man-hours of the motor 2 and the pump 1.

According to this embodiment, the stator 30 has the mounting recess 30a recessed from the outer side surface of the stator 30 toward the radially inner side and extending in the circumferential direction. The terminal holder 15 has the body 16 that extends in the circumferential direction and is arranged on the upper side, namely the axial one side, of the stator core 31, and the claw 18 that extends from the body 16 to the lower side, namely the axial other side. The claw 18 has the protrusion 18a that protrudes toward the radially inner side, and the protrusion 18a is provided inside the mounting recess 30a. Thus, in a process of connecting the circuit board 70 and the connection terminal 50, the terminal holder 15 is moved in the circumferential direction along the outer side surface of the stator 30, so the circumferential position of the connection terminal 50 relative to the circuit board 70 is able to be adjusted. Thus, when the terminal holder 15 is moved in the circumferential direction, it is possible to suppress displacement of the radial position of the connection terminal 50 with respect to the circuit board 70, and to connect the circuit board 70 and the connection terminal 50 more easily. As a result, it is possible to suppress an increase in the manufacturing man-hours of the motor 2 and the pump 1 more suitably.

According to this embodiment, the stator 30 has the multiple mounting recesses 30a arranged at intervals along the circumferential direction. The terminal holder 15 has the multiple claws 18 arranged at intervals along the circumferential direction. Each protrusion 18a of the multiple claws 18 is arranged inside each of the multiple mounting recesses 30a. The circumferential dimension of the protrusions 18a is smaller than the circumferential dimension of the mounting recesses 30a, and when viewed from the circumferential direction, each protrusion 18a overlaps the restriction surface 30b, which is a surface facing the circumferential direction in the inner side surface of the mounting recess 30a. Thus, as described above, the moving distance of the terminal holder 15 in the circumferential direction with respect to the stator 30 is able to be restricted by the restriction surface 30b. Therefore, in a process of connecting the circuit board 70 and the connection terminal 50, when adjusting the circumferential position of the connection terminal 50 with respect to the circuit board 70, it is possible to suppress the connection terminal 50 from moving too much in the circumferential direction. As a result, it is possible to adjust the circumferential position of the connection terminal 50 with respect to the circuit board 70 more easily, and thereby it is possible to connect the circuit board 70 and the connection terminal 50 more easily. Thus, it is possible to suppress an increase in manufacturing man-hours of the motor 2 and the pump 1 more suitably.

According to this embodiment, the support surface 32b, which is a surface facing the lower side, namely the axial other side, in the inner side surface of the mounting recess 30a, is provided on the outer side surface of the insulator 32. The claw 18 is elastically deformable toward the radially outer side, and the support surface 32b supports the protrusion 18a in the axial direction. Accordingly, in a process of mounting the terminal holder 15 to the stator 30, when moving the terminal holder 15 toward the lower side from the upper side of the stator 30 fixed to the motor housing 11 beforehand, if the protrusion 18a of the claw 18 contacts with the outer side surface of the annular wall 32a of the insulator 32, the claw 18 is elastically deformed toward the radially outer side. Thereby, when inserting the claw 18 into the space between the annular wall 32a and the peripheral wall 11a, it is possible to prevent the claw 18 from being caught by the surface of the annular wall 32a facing the upper side, so it is possible to insert the claw 18 into the space between the annular wall 32a and the peripheral wall 11a easily. Moreover, when moving the terminal holder 15 toward the lower side to a position where the protrusion 18a faces the mounting recess 30a in the radial direction, it is possible to arrange the protrusion 18a inside the mounting recess 30a by the restoring force of the claw 18 directed toward the radially inner side. At this time, since the support surface 32b support the protrusion 18a in the axial direction, it is possible to determine the axial position of the terminal holder 15 with respect to the stator 30, and to mount the terminal holder 15 on the stator 30. Thus, in this embodiment, the terminal holder 15 is able to be mounted on the stator 30 only by the work of moving the terminal holder 15 toward the lower side, it is possible to simplify the work of mounting the terminal holder 15 to the stator 30. As a result, it is possible to suppress an increase in the manufacturing man-hours of the motor 2 and the pump 1.

Moreover, in this embodiment, it is possible to prevent the terminal holder 15 from moving in the axial direction relative to the stator 30, so it is possible to determine the axial position of the connection terminal 50 relative to the circuit board 70 with high accuracy. As a result, the connection terminal 50 is able to be connected to the circuit board 70 more easily, and so it is possible to suppress increase of assembling man-hours of the motor 2 and the pump 1 more suitably.

According to this embodiment, the terminal holder 15 holds the multiple connection terminals 50, and has an annular shape centered on the central axis J. Thus, since the terminal holder 15 is constituted of one member, it is possible to mount multiple connection terminals 50 on the stator 30 only by the work of mounting one member to the stator 30. Thus, since it is possible to simplify the work of mounting multiple connection terminals 50 to the stator 30, and so it is possible to suppress an increase in the number of manufacturing man-hours of the motor 2 and the pump 1 more suitably.

According to this embodiment, the terminal holder 15 has the terminal holding part 17 that holds the connection terminal 50. The terminal holding part 17 has the holding hole 17a recessed from a surface facing the upper side, namely the axial one side, of the terminal holding part 17, toward the lower side, namely the axial other side. The connection terminal 50 has the terminal body 51 that extends in the axial direction, and the connection part 52 that extends to the lower side from the terminal body 51 and that is connected to the coil 33. The connection part 52 is held in the holding hole 17a. Thus, in the process of mounting the connection terminal 50 to the terminal holder 15, it is possible to mount the connection terminal 50 on the terminal holder 15 only by the work of moving the connection terminal 50 toward the lower side from the upper side of the terminal holder 15 and inserting the connection part 52 into the holding hole 17a. As a result, it is possible to simplify the work of mounting the connection terminal 50 on the terminal holder 15, and so it is possible to suppress an increase in the number of manufacturing man-hours of the motor 2 and the pump 1 more suitably.

Moreover, in this embodiment, since the connection part 52 is held in the holding hole 17a, it is possible to determine the position of the connection part 52 relative to the terminal holder 15 with high accuracy. Thus, it is possible to stabilize the connection between the connection part 52 and the coil lead-out wire 33c, and so the coil 33 and the circuit board 70 are able to be connected stably through the connection terminal 50. As a result, it is possible to drive the motor 2 and the pump 1 stably and to enhance the output efficiency of the motor 2.

According to this embodiment, the connection part 52 has: the press-contact part 52a recessed from the lower side, namely the axial other side, of the connection part 52 toward the upper side, namely the axial one side, and open at both sides in the radial direction; and the first press-fit parts 52d and 52e press-fitted into holding holes 17a. The coil 33 has the coil lead-out wire 33c which is led out from the coil body 33a. The coil lead-out wire 33c is passed through the inside of the press-contact part 52a in the radial direction and press-fitted into the press-contact part 52a. Thus, in the process of mounting the connection terminal 50 to the terminal holder 15, it is possible to press-fit the connection part 52 into the holding hole 17a only by the work of moving the connection terminal 50 from the upper side of the terminal holder 15 to the lower side and inserting the connection part 52 into the holding hole 17a. Thus, it is possible to simplify the work of mounting the connection terminal 50 to the terminal holder 15, and to mount the connection terminal 50 on the terminal holder 15 firmly.

Moreover, in this embodiment, in the process of mounting the connection terminal 50 to the terminal holder 15, only by the work of arranging the coil lead-out wire 33c led out in the radial direction on the upper side of the holding hole 17a, and at the same time moving the connection terminal 50 from the upper side of the terminal holder 15 to the lower side and inserting the connection part 52 into the holding hole 17a, the coil lead-out wire 33c is able to be press-fitted into the press-contact part 52a, such that the coil lead-out wire 33c is connected to the connection terminal 50. That is, by one work of inserting the connection part 52 into the holding hole 17a, the connection terminal 50 is able to be mounted on the terminal holder 15 and the coil lead-out wire 33c and the connection terminal 50 are able to be connected, so it is possible to suppress an increase in manufacturing man-hours of the motor 2 and the pump 1 more suitably.

Moreover, in this embodiment, since the coil lead-out wire 33c is press-fitted into the press-contact part 52a, the coil lead-out wire 33c is able to be fixed to the connection part 52 firmly. Therefore, it is possible to stabilize the connection between the coil lead-out wire 33c and the connection terminal 50. Further, since the contact area of the coil lead-out wire 33c and the connection terminal 50 is able to be enlarged, it is possible to reduce contact resistance between the coil lead-out wire 33c and the connection terminal 50. Thereby, the coil 33 and the circuit board 70 are able to be connected stably via the connection terminal 50, so it is possible to drive the motor 2 and the pump 1 more stably, and to further enhance the output efficiency of the motor 2.

According to this embodiment, the connection part 52 has a plate shape with a plate surface facing the radial direction, and the radial dimension of the holding hole 17a is larger than the radial dimension of the connection part 52. If the circumferential dimension of the holding hole 17a relative to the circumferential dimension of the connection part 52 becomes too small due to the dimensional variation of the holding hole 17a and the connection part 52, there is a risk that the pressurizing force required for press-fitting the connection part 52 into the holding hole 17a increases. On the other hand, in this embodiment, as described above, the radial dimension of the holding hole 17a is larger than the radial dimension of the connection part 52, so when the circumferential force applied to the first part 52b and the second part 52c of the connection part 52 becomes too large, the first part 52b and the second part 52c are able to be displaced in the radial direction, so it is possible to suppress an increase in the circumferential force applied to the first part 52b and the second part 52c relatively. Thereby, it is possible to suppress an increase in the pressurizing force required for press-fitting the connection part 52 into the holding hole 17a, and so it is possible to easily mount the connection terminal 50 on the terminal holder 15. As a result, it is possible to suppress an increase in the manufacturing man-hours of the motor 2 and the pump 1 more suitably.

Moreover, in this embodiment, as described above, even if the circumferential dimension of the holding hole 17a relative to the circumferential dimension of the connection part 52 is too small, the circumferential force applied to each first part 52b and the second part 52c is able to be reduced, and so it is possible to suppress excessive increase in the circumferential pressure applied to the coil lead-out wire 33c press-fitted into the press-contact part 52a. Thus, it is possible to prevent the coil lead-out wire 33c from being damaged, and so it is possible to electrically connect the coil 33 and the circuit board 70 stably. As a result, it is possible to drive the motor 2 and the pump 1 stably, and enhance the output efficiency of the motor 2.

According to this embodiment, the terminal holding part 17 has the groove 17c recessed from the upper side, namely the axial one side, toward the lower side, namely the axial other side, and traversing the holding hole 17a in the radial direction. When viewed in the radial direction, the press-contact part 52a overlaps the groove 17c, and the coil lead-out wire 33c is passed through the inside of the groove 17c. Thus, in the process of connecting the coil lead-out wire 33c to the connection terminal 50, by passing the coil lead-out wire 33c in the radial direction through the inside of the groove 17c, the circumferential position of the coil lead-out wire 33c with respect to the holding hole 17a is able to be determined with high accuracy. Therefore, when inserting the connection part 52 into the holding hole 17a, it is possible to press-fit the coil lead-out wire 33c into the press-contact part 52a more easily. As a result, since the coil 33 and the connection terminal 50 are able to be connected more easily, it is possible to suppress an increase of manufacturing man-hours of the motor 2 and the pump 1 more suitably.

According to this embodiment, the terminal holder 15 has the notch 16b recessed in the radial direction. Thus, by a simple work of moving a jig or the like in the circumferential direction while hooking the notch 16b to the jig or the like, the terminal holder 15 is movable in the circumferential direction with respect to the stator 30, and the circumferential position of the connection terminal 50 with respect to the circuit board 70 is able to be adjusted easily. As a result, it is possible to suppress an increase in the manufacturing man-hours of the motor 2 and the pump 1.

Moreover, in this embodiment, the coil 33 is constituted of a coil wire whose circumference of the copper wire is covered with an insulating film such as enamel. When such a coil wire is used, a method for electrically connecting the coil lead-out wire 33c to the connection terminal 50 generally includes a method for connecting the coil lead-out wire 33c to the connection terminal 50 after removing an insulating film at least at a part in contact with the press-contact part 52a beforehand, and a method for performing connection welding such as fusing welding, in which the copper wire is able to be connected to the connection terminal 50 while melting the enamel wire.

On the other hand, in this embodiment, as described above, the corner 52m having a sharp shape toward the inside of the circumferential one side (+θ side) and the corner 52n having a sharp shape toward the circumferential other side (−θ side) are defined in the press-contact part 52a. The corners 52m and 52n face each other in the radial direction, and the gap between the corners 52m and 52n is smaller than the diameter of the coil lead-out wire 33c. Thus, by inserting the coil lead-out wire 33c from which the insulating film has not been removed into the inside of the press-contact part 52a from the lower side of the connection part 52, the insulating film of the coil lead-out wire 33c is able to be torn by the corners 52m and 52n, and so the press-contact part 52a and the copper wire of the coil lead-out wire 33c are able to be brought into contact with each other. Thereby, in the process of connecting the coil lead-out wire 33c to the connection terminal 50, the work of removing the insulating film of the coil lead-out wire 33c becomes unnecessary, so it is possible to simplify the work of connecting the coil lead-out wire 33c to the connection terminal 50. Moreover, since the coil lead-out wire 33c is able to be connected to the connection terminal 50 only by the simple work of inserting the coil lead-out wire 33c into the press-contact part 52a, it is possible to simplify the work of connecting the coil lead-out wire 33c to the connection terminal 50 compared with the case of performing the work of connection welding such as fusing welding. As a result, it is possible to suppress an increase in the manufacturing man-hours of the motor 2 and the pump 1 more suitably.

Second Embodiment

As shown in FIG. 13, a motor 202 of this embodiment is provided with multiple terminal holders 215. In this embodiment, the motor 202 is provided with three terminal holders 215. In the following description, the same reference numeral is given to the component of the same reference numeral as the first embodiment, and the description is omitted.

In this embodiment, each terminal holder 215 has a substantially circular arc shape centered on the central axis J. In this embodiment, the center angle of each terminal holder 215 is about 115°. Moreover, the center angles of the terminal holders 215 may be mutually different angles. The terminal holders 215 are arranged at intervals along the circumferential direction. Each terminal holder 215 has a body 216, the terminal holding part 17, and a claw (not shown) in the figure. The configuration of the terminal holding part 17 of this embodiment is identical to the configuration of the terminal holding part 17 of the first embodiment.

In this embodiment, the body 216 is a plate shape that extends in the circumferential direction. In this embodiment, the body 216 is composed of a pair of extension parts 216a. Each pair of extension parts 216a has a plate shape that extends in the circumferential direction centered on the central axis J. The plate surfaces of the pair of extension parts 216a face the axial direction. When viewed in the axial direction, the outer side surfaces of the pair of extension parts 216a facing the radially outer side have an arc shape centered on the central axis J. When viewed in the axial direction, the inner side surfaces of the pair of extension parts 216a facing the radially inner side have arc shapes centered on the central axis J. When viewed in the axial direction, the angle defined by a straight line connecting the central axis J and the end of the extension part 216a on the circumferential one side (+θ side) and a straight line connecting the central axis J and the end of the extension part 216a on the circumferential other side (−θ side) is about 45°. The pair of extension parts 216a are arranged at intervals along the circumferential direction. The pair of extension parts 216a are arranged so as to sandwich the terminal holding part 17 in the circumferential direction. The pair of extension parts 216a are connected to the terminal holding part 17 in the circumferential direction. The terminal holding part 17 of each terminal holder 215 holds the connection terminal 50. Moreover, the claws (not shown) may be provided on the pair of extension parts 216a, respectively, or may be provided on only one of the extension parts 216a.

The motor 202 according to this embodiment is provided with the multiple terminal holders 215 for holding the connection terminal 50. Each of the multiple terminal holders 215 has an arc shape centered on the central axis J, and the multiple terminal holders 215 are arranged along the circumferential direction. In a case where the terminal holder has an annular shape, when mounting the terminal holder to the stator 30, there is a need to arrange the protrusions of the multiple claws arranged surrounding the stator 30 almost simultaneously inside the mounting recess 30a of the stator 30. Therefore, in a process of mounting the terminal holder on the stator 30, it is necessary to move the terminal holder toward the lower side from the upper side of the stator 30, while making the center of the terminal holder and the center of the stator 30 precisely aligned. On the other hand, in this embodiment, since each terminal holder 215 has a circular arc shape, the claw of each terminal holder 215 is not arranged surrounding the stator 30. Therefore, in a process of mounting the terminal holder 215 to the stator 30, for example, the claw of the terminal holder 215 is located further on the radially outer side than the stator 30, and at the same time, the terminal holder 215 is moved toward the lower side, and after the protrusion of the claw faces the mounting recess 30a in the radial direction, the terminal holder 215 is moved toward the radially inner side and the protrusion is arranged inside the mounting recess 30a, thereby the terminal holder 215 is able to be mounted on the stator 30. Thus, when moving the terminal holder 215 from the upper side of the stator 30 to the lower side, there is no need to precisely align the center of the terminal holder 215 with the center of the stator 30, so it is possible to simplify the work of mounting the terminal holder 215 to the stator 30. As a result, it is possible to suppress an increase in the manufacturing man-hours of the motor 202 and a pump 201.

Moreover, the number of the terminal holders 215 possessed by the motor 202 is not limited to three, but may be two or four or more. Even in these cases, it is possible to simplify the work of mounting the terminal holder 215 to the stator 30.

Third Embodiment

As shown in FIG. 14, a motor housing 311 of a housing 310 of this embodiment has a mounting recess 311j, and a protrusion 318a of a terminal holder 315 is arranged inside the mounting recess 311j. In the following description, the same reference numeral is given to the component of the same reference numeral as the first embodiment, and the description is omitted.

The mounting recess 311j is a hole recessed from the inner side surface of a peripheral wall 311a toward the radially outer side. That is, the mounting recess 311i is a hole recessed from the inner side surface of the motor housing 311 toward the radially outer side. The mounting recess 311j extends in the circumferential direction. Although not shown, the mounting recess 311i has a substantially rectangular shape when viewed in the radial direction. Although not shown, the surface in the inner side surface of the mounting recess 311j facing the circumferential direction is a restriction surface. The mounting recess 311i has two restriction surfaces. One restriction surface faces the circumferential one side (+θ side), and the other restriction surface faces the circumferential other side (−θ side). Although not shown, in this embodiment, multiple mounting recesses 311j are provided in the peripheral wall 311a. In this embodiment, three mounting recesses 311j are provided in the peripheral wall 311a. The mounting recesses 311j are arranged at substantially equal intervals along the circumferential direction.

In this embodiment, the terminal holder 315 has the body 16, the terminal holding part 17, and a claw 318. The configuration or the like of the body 16 and the terminal holding part 17 in this embodiment are the same as the configuration or the like of the body 16 and the terminal holding part 17 in the first embodiment.

The claw 318 has a plate shape that extends from the body 16 to the lower side, namely the axial one side. The claw 318 is arranged on the radially outer side of the annular wall 32a and on the radially inner side of the peripheral wall 11a. The plate surface of the claw 318 faces the radial direction. Although not shown, in this embodiment, the terminal holder 315 has multiple claws 318. In this embodiment, the terminal holder 315 has three claws 318. The multiple claws 318 are arranged at intervals along the circumferential direction.

The claw 318 has the protrusion 318a protruding toward the radially outer side. The protrusion 318a protrudes toward the radially outer side from the lower edge of the claw 318. Each protrusion 318a is arranged inside a different mounting recess 311j. In this embodiment, each claw 318 is elastically deformable toward the radially outer side. Therefore, it is possible to suppress the movement of each protrusion 318a to the radially outer side. Moreover, the surface in the inner side surface of each mounting recess 311j facing the lower side contacts the protrusions 318a in the axial direction and supports the protrusions 318a in the axial direction. Thereby, the terminal holder 315 is mounted on the motor housing 311.

Although not shown, in this embodiment, the circumferential dimension of each protrusion 318a is smaller than the circumferential dimension of the mounting recess 311j. Therefore, the terminal holder 315 is moveable in the circumferential direction with respect to the motor housing 311. Although not shown, each protrusion 318a overlaps the restriction surface of the mounting recess 311j. Therefore, as in the first embodiment, it is possible to restrict the moving distance of the terminal holder 315 in the circumferential direction with respect to the motor housing 311 by the restriction surface.

According to this embodiment, a motor 302 includes the terminal holder 315 that holds the connection terminal 50 mounted on the motor housing 311 and movable in the circumferential direction. Thus, it is possible to adjust the circumferential position of the connection terminal 50 with respect to the circuit board 70, and so it is possible to simplify the work of connecting the connection terminal 50 to the circuit board 70. Moreover, as a result of adjusting the circumferential position of the connection terminal 50 with respect to the circuit board 70, even if the circumferential position of the connection terminal 50 with respect the stator 30 is displaced, it is possible to connect the coil lead-out wire 33c to the connection terminal 50 easily by appropriately adjusting the length of the coil lead-out wire 33c between the coil body 33a and the connection terminal 50, as described above. As a result, it is possible to simplify the work of connecting the coil 33 to the connection terminal 50. From the above, in this embodiment, it is possible to simplify the work of connecting the coil 33 and the circuit board 70 through the connection terminal 50 even if the stator 30 is fixed to the motor housing 311 with its circumferential position displaced with respect to the motor housing 311. Thus, it is possible to suppress an increase in manufacturing man-hours of the motor 302 and a pump 301.

According to this embodiment, the motor housing 311 has the mounting recess 311j recessed from the inner side surface of the motor housing 311 toward the radially outer side and extending in the circumferential direction. The terminal holder 315 has: the body 16 that extends in the circumferential direction and is arranged on the upper side, namely the axial one side, of the stator core 31; and the claw 318 that extends from the body 16 to the lower side, namely the axial other side. The claw 318 has the protrusion 318a that protrudes toward the radially outer side, and the protrusion 318a is arranged inside the mounting recess 311j. Thus, in the process of connecting the circuit board 70 and the connection terminal 50, the terminal holder 315 is able to be moved in the circumferential direction along the inner side surface of the motor housing 311. Accordingly, when moving the terminal holder 315 in the circumferential direction, it is possible to suppress displacement of the radial position of the connection terminal 50 with respect to the circuit board 70, so it is possible to connect the circuit board 70 and the connection terminal 50 more easily. As a result, it is possible to suppress an increase in the manufacturing man-hours of the motor 302 and the pump 301 more suitably.

Other configurations and other methods may be employed within the scope of the technical ideas of this disclosure, not limited to the embodiment described above. For example, the number of terminal holding parts that the terminal holder has may not be limited to three, and may be two or less, or four or more. Moreover, the number of connection terminals of the motor is not limited to three, but may be two or less, or four or more. Further, the number of coil lead-out wires connected to the connection terminal may be one, or three or more.

Moreover, the number of flanges of the board accommodator may be three or more. Further, the flange may be provided on the lid or on the motor housing.

Moreover, the method for connecting the board connection part 53 and the second via hole 70b is not limited to press-fitting, and connection by other method such as soldering is possible.

The application of the motor is not particularly limited. The motor may be installed on a device other than the pump. The use of the pump equipped with the motor to which this disclosure is applied is not particularly limited. The type of fluid sent by the pump is not particularly limited, and may be water or the like. The motor and the pump may be installed on device other than the vehicle. Moreover, each configuration and methods described in this specification may be combined as appropriate within a range that does not conflict with each other.

Further, this technology may have the following configuration. (1) A motor, including: a motor part having a rotor rotatable about a central axis and a stator facing the rotor in a radial direction with a gap therebetween; a circuit board arranged on an axial one side of the motor part; a connection terminal arranged between the stator and the circuit board in an axial direction; and a motor housing having a cylindrical shape that extends in the axial direction and accommodating the motor part. The stator includes an annular stator core; a coil having multiple coil bodies attached to the stator core; and an insulator arranged between the stator core and the coil. The connection terminal electrically connects the coil and the circuit board. The motor includes a terminal holder, which holds the connection terminal and is mounted on either the stator or the motor housing and moveable in a circumferential direction. (2) The motor according to (1), wherein the stator has a mounting recess recessed from an outer side surface of the stator toward a radially inner side and extending in the circumferential direction. The terminal holder includes: a body extending in the circumferential direction and arranged on an axial one side of the stator core, and a claw extending from the body to an axial other side. The claw has a protrusion protruding toward the radially inner side. The protrusion is arranged inside the mounting recess. (3) The motor according to (2), wherein the stator includes multiple mounting recesses arranged at intervals along the circumferential direction. The terminal holder includes multiple claws arranged at intervals along the circumferential direction. The protrusion of each of the multiple claws is arranged inside of each of the multiple mounting recesses. A circumferential dimension of the protrusion is smaller than a circumferential dimension of the mounting recess. When viewed in the circumferential direction, each of the protrusions overlaps with a surface in an inner side surface of the mounting recess facing the circumferential direction. (4) The motor according to (2) or (3), wherein a support surface, which is a surface in an inner side surface of the mounting recess facing an axial other side, is provided on an outer side surface of the insulator. The claw is elastically deformable toward a radially outer side. The support surface supports the protrusion in the axial direction. (5) The motor according to (1), wherein the motor housing has a mounting recess recessed from an inner side surface of the motor housing toward a radially outer side and extending in the circumferential direction. The terminal holder includes: a body extending in the circumferential direction and arranged on the axial one side of the stator core, and a claw extending from the body to the axial other side. The claw has a protrusion protruding toward the radially outer side. The protrusion is arranged inside the mounting recess. (6) The motor according to any one of (2) to (5), wherein the terminal holder holds multiple connection terminals, and has an annular shape centered on the central axis. (7) The motor according to any one of (2) to (5), including multiple terminal holders for holding the connection terminal. Each of the multiple terminal holders has an arc shape centered on the central axis, and the multiple terminal holders are arranged along the circumferential direction. (8) The motor according to any one of (1) to (7), wherein the terminal holder includes a terminal holding part for holding the connection terminal. The terminal holding part has a holding hole recessed from a surface facing an axial one side of the terminal holding part toward the axial other side. The connection terminal includes a terminal body extending in the axial direction, and a connection part extending from the terminal body to the axial other side and connected to the coil. The connection part is held in the holding hole. (9) The motor according to (8), wherein the connection part includes: a press-contact part recessed from an axial other side of the connection part to an axial one side and open at both sides in the radial direction; and a first press-fit part press-fitted into the holding hole. The coil includes a coil lead-out wire led out from the coil body. The coil lead-out wire is passed through the inside of the press-contact part in the radial direction and press-fitted into the press-contact part. (10) The motor according to (9), wherein the connection part has a plate shape with a plate surface facing the radial direction, and a radial dimension of the holding hole is larger than a radial dimension of the connection part. (11) The motor according to (9) or (10), wherein terminal holding part has a groove recessed from the axial one side to the axial other side and traversing the holding hole in the radial direction. When viewed in the radial direction, the press-contact part overlaps the groove. The coil lead-out wire is passed through inside of the groove. (12) A motor according to any one of (8) to (11), wherein the terminal holding part is arranged between the coil bodies adjacent to each other in the circumferential direction. (13) The motor according to any one of (1) to (12), wherein the terminal holder and has a notch recessed in the radial direction. (14) A pump, including a motor according to any one of (1) to (13) and a pump mechanism connected to the rotor.

Features of the above-described preferred embodiments and the modifications thereof may be combined appropriately as long as no conflict arises. While preferred embodiments of the present disclosure have been described above, it is to be understood that variations and modifications will be apparent to those skilled in the art without department from the scope and spirit of the present disclosure. The scope of the present disclosure, therefore, is to be determined solely by the following claims.

MOTOR AND PUMP

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CPC

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Priority Claims (1)