Patent Application
20210210876
The present application claims priority to and incorporates by reference the entire contents of Japanese Patent Application No. 2020-001241 filed in Japan on Jan. 8, 2020.
The present invention relates to a conductor connecting structure.
Conventionally, there is a terminal block that absorbs a difference in height between the terminal block and a connecting member. Japanese Patent Application Laid-open No. 2004-327185 discloses a technique for absorbing a difference in height between a first fastening member and a connecting portion of a conductive path by moving the first fastening member in a fastening member housing chamber in a fastening direction, thereby fastening first and second connecting portions to fix them to a terminal block.
It is desirable to be capable of adjusting positions of conductors in a direction that intersects a fastening direction by screw members. For example, it is advantageous in absorbing tolerances if the positions of the conductors can be adjusted in a direction perpendicular to the fastening direction after co-fastening by the screw members is completed.
An object of the present invention is to provide a conductor connecting structure that enables positional adjustment of the conductors in a direction that intersects the fastening direction by the screw members.
In order to achieve the above mentioned object, a conductor connecting structure according to one aspect of the present invention includes a first conductor having a flat plate terminal portion; a second conductor having a flat plate terminal portion; a support having a recessed portion; a first screw member accommodated in the recessed portion; and a second screw member that co-fastens the terminal portion of the first conductor and the terminal portion of the second conductor by screwing to the first screw member, wherein the recessed portion has a first wall surface and a second wall surface that face each other in an opposing direction, and a restricting surface that connects the first wall surface and the second wall surface along the opposing direction and restricts rotation of the first screw member, the first wall surface and the second wall surface configure a retaining portion, located at a bottom of the recessed portion, configured to retain the first screw member before being screwed to the second screw member, and an allowable portion located closer to an inlet of the recessed portion than the retaining portion, and a distance between the first wall surface and the second wall surface in the allowable portion is greater than a distance between the first wall surface and the second wall surface in the retaining portion.
According to another aspect of the present invention, in the conductor connecting structure, it is preferable that the first screw member is a nut, the second screw member is a bolt, and the bolt is screwed to the nut and rotated relative to the nut to pull the nut out of the retaining portion.
According to still another aspect of the present invention, in the conductor connecting structure, it is preferable that the recessed portion has a third wall surface and a fourth wall surface that face each other and connect the first wall surface and the second wall surface along the opposing direction respectively; and each of the third and the fourth wall surfaces restricts the rotation of the first screw member as the restricting surface.
According to still another aspect of the present invention, in the conductor connecting structure, it is preferable that the support is a housing of a connector, the second conductor is a busbar that has a first terminal portion connected to the first conductor and a second terminal portion to be connected to a mating terminal, and is bent so that the first terminal portion and the second terminal portion are orthogonal to each other, and the opposing direction is a direction orthogonal to a main surface of the second terminal portion.
According to still another aspect of the present invention, in the conductor connecting structure, it is preferable that the housing has a rib configured to guide the first terminal portion along the opposing direction.
According to still another aspect of the present invention, in the conductor connecting structure, it is preferable that the first conductor is a terminal connected to a wire, the support is a housing of a connector, a portion between an outer peripheral surface of the wire and the housing is sealed by a sealing member, and the opposing direction is a direction orthogonal to an axial direction of the wire.
The above and other objects, features, advantages and technical and industrial significance of this invention will be better understood by reading the following detailed description of presently preferred embodiments of the invention, when considered in connection with the accompanying drawings.
A conductor connecting structure according to an embodiment of the present invention will be described in detail with reference to the drawings. The present invention is not limited by the accompanying embodiment. The components in the following embodiments include those that can be readily conceived by a person skilled in the art or those that are substantially the same.
Referring to
As illustrated in
The connector 1 according to the present embodiment is connected to two wires W. The two wires W are arranged in parallel and extend from the connector 1 in the same direction. In the following description, the axial direction of the wires W is referred to as a “first direction X”. The direction in which the wires W are aligned is referred to as a “second direction Y”. The second direction Y is orthogonal to the first direction X. The direction orthogonal to both the first direction X and the second direction Y is referred to as a “third direction Z”.
The housing 2 is a case body that accommodates the nuts 5, the busbars 4, the crimping terminals 3, the bolts 6, and the sealing members 7. The housing 2 has recessed portions 10 in a shape corresponding to the shape of the nuts 5. The nuts 5 according to the present embodiment are square nuts with a rectangular shape in plan view. The nuts 5 are accommodated in the respective recessed portions 10, as illustrated in
As illustrated in
The first terminal portions 41a, 42a respectively have through holes 41c, 42c and notches 41f, 42f. The through holes 41c and 42c are holes through which the respective bolts 6 are inserted. Guide ribs 27A, 27B (refer to
The second terminal portions 41b, 42b respectively have through holes 41d, 42d and engagement holes 41e, 42e. The through holes 41d and 42d are holes through which fastening members such as bolts are inserted. The second terminal portions 41b and 42b are fixed to the mating terminals, for example, by fastening members. The engagement holes 41e, 42e engage with locking portions 28b (refer to
The first busbar 41 is bent so that the first terminal portion 41a and the second terminal portion 41b are orthogonal to each other. The first busbar 41 and the second busbar 42 are installed in the housing 2 such that the first terminal portions 41a, 42a overlap with the respective nuts 5. At this time, the second terminal portions 41b, 42b penetrate through and protrude from the housing 2.
As illustrated in
The wire connecting portions 32 are tightened against core wires 35 of the wires W and are crimped against the core wires 35. The sealing members 7 are pre-mounted to the covering of the wires W. Furthermore, the retainer 8 is mounted to the wires W. The crimping terminals 3 are inserted into a second housing portion 21 of the housing 2, as illustrated in
The bolts 6 are then attached as illustrated in
The housing 2 has a fitting portion 28 fitted with the mating connector or a case body of a mating device. The fitting portion 28 is fitted with the mating portion and the second terminal portions 41b, 42b of the busbars 41, 42 are connected to the mating terminals.
The conductor connecting structure 100 according to the present embodiment is configured to allow relative movement of the busbars 41, 42 with respect to the housing 2, as will be described below. The busbars 41, 42, together with the terminal portions 31, the nuts 5, and the bolts 6, can move along the second direction Y relative to the housing 2. Therefore, the conductor connecting structure 100 according to the present embodiment can absorb tolerances when the busbars 41, 42 are connected to the mating terminals.
As illustrated in
The shape of the first housing portion 20 in plan view is substantially rectangular. The first housing portion 20 has a support wall 22, a first side wall 23A, a second side wall 23B, a third side wall 23C, and a fourth side wall 23D. The support wall 22 is a bottom wall of the first housing portion 20 and supports the busbars 41, 42, and the like. The first side wall 23A, the second side wall 23B, the third side wall 23C, and the fourth side wall 23D are erected from the edges of the support wall 22. The first side wall 23A, the second side wall 23B, the third side wall 23C, and the fourth side wall 23D are connected to each other to form a square cylindrical tube portion 23.
The first side wall 23A and the second side wall 23B are opposite to each other in the first direction X. The third side wall 23C and the fourth side wall 23D are opposite to each other in the second direction Y. The third side wall 23C and the fourth side wall 23D connect the end portions of the first side wall 23A and the end portions of the second side wall 23B along the first direction X.
The support wall 22 has a first through hole 24 and a second through hole 25. The through holes 24, 25 penetrate the support wall 22 along the third direction Z. The sectional shape of the through holes 24 and 25 is a rectangle in which the first direction X is the longitudinal direction. The two through holes 24, 25 are adjacent to the third side wall 23C and aligned along the first direction X. The first through hole 24 is adjacent to the first side wall 23A. The second through hole 25 is adjacent to the second side wall 23B. The second terminal portion 41b of the first busbar 41 is inserted into the first through hole 24. The second terminal portion 42b of the second busbar 42 is inserted into the second through hole 25.
The support wall 22 has the recessed portions 10. The recessed portions 10 include a first recessed portion 10A and a second recessed portion 10B. The first and the second recessed portions 10A and 10B are adjacent to the first side wall 23A and aligned along the second direction Y. A partition wall 26 is provided between the first recessed portion 10A and the second recessed portion 10B. The partition wall 26 is a wall portion that divides the first busbar 41 from the second busbar 42, and is a rib provided on the support wall 22. The shape of the partition wall 26 in plan view is L-shaped. The partition wall 26 has a first wall portion 26A and a second wall portion 26B. One end of the first wall portion 26A is connected to the first side wall 23A. The first wall portion 26A extends along the first direction X from the first side wall 23A toward the second side wall 23B. The second wall portion 26B is connected to the other end of the first wall portion 26A and extends along the second direction Y toward the third side wall 23C. The end of the second wall portion 26B is located between the first through hole 24 and the second through hole 25.
The first recessed portion 10A is located on the side of the first through hole 24 with respect to the first wall portion 26A. The second recessed portion 10B is located on the side of the fourth side wall 23D with respect to the first wall portion 26A. That is, the first wall portion 26A is located between the first recessed portion 10A and the second recessed portion 10B in the second direction Y. The support wall 22 has a first guide rib 27A and a second guide rib 27B. The first guide rib 27A is a rib that guides the first busbar 41 along the second direction Y. The first guide rib 27A extends along the second direction Y from the first wall portion 26A toward the third side wall 23C. The second guide rib 27B is a rib that guides the second busbar 42 along the second direction Y. The second guide rib 27B extends along the second direction Y from the fourth side wall 23D toward the first wall portion 26A.
As illustrated in
As illustrated in
The first through hole 24 and the second through hole 25 penetrate the fitting portion 28. Thus, as illustrated in
As illustrated in
As illustrated in
Mn1≤Wd1 (1)
On the other hand, when the movable range of the nut 5 in the retaining portion 16 is excessive, the position of the nut 5 with respect to the center line CL of the recessed portion 10 will be large, and the bolt 6 may be uninsertable to the nut 5. The maximum value of the distance between the first wall surface 11 and the second wall surface 12 is assumed to be Mx1, which is required so that the bolt 6 will not be uninsertable to the nut 5. In this case, the distance Wd1 in the retaining portion 16 is defined so that the following equation (2) is satisfied.
Wd1≤Mx1 (2)
The value of the distance Wd1 in the retaining portion 16 may be determined so that the nut 5 is substantially non-rotatable. The maximum value of the distance between the first wall surface 11 and the second wall surface 12 is assumed to be Mx2, which is required to make the nut 5 substantially non-rotatable. In this case, the distance Wd1 in the retaining portion 16 may be defined so that both equation (2) above and following equation (3) are satisfied.
Wd1≤Mx2 (3)
A distance Wd2 between the first wall surface 11 and the second wall surface 12 in the allowable portion 17 is greater than the distance Wd1 in the retaining portion 16. The allowable portion 17 is configured to allow movement of the nut 5 along the second direction Y in the state of completion of screwing the nut 5 to the bolt 6, as described below. On the first wall surface 11, the portion configuring the retaining portion 16 is closer to the center line CL than the portion configuring the allowable portion 17. Furthermore, on the second wall surface 12, the portion configuring the retaining portion 16 is closer to the center line CL than the portion configuring the allowable portion 17. Thus, in a state where the nut 5 is retained by the retaining portion 16, the first wall surface 11 of the allowable portion 17 and the second wall surface 12 of the allowable portion 17 are separated from the nut 5. An introducing tapered shape and a step are provided between the retaining portion 16 and the allowable portion 17.
For example, the value of the distance Wd3 is determined to make the nut 5 substantially non-rotatable. The maximum value of the distance between the restricting surface 13a and the restricting surface 14a is assumed to be Mx3, which is required to make the nut 5 substantially non-rotatable. In this case, the distance Wd3 is defined so that the following equation (4) is satisfied.
Wd3≤Mx3 (4)
The distance Wd3 may be defined so that the distance Wd3 absorbs tolerances and allows the nut 5 and the bolt 6 to be screwed together. The minimum value of the distance between the restricting surface 13a and the restricting surface 14a is assumed to be Mn2, which is required to align the nut 5 and the bolt 6. In this case, the distance Wd3 is defined so that the following equation (5) is satisfied.
Mn2≤Wd3 (5)
It is desirable that the distance Wd3 is defined within a range in which the bolt 6 will not be uninsertable to the nut 5. The maximum value of the distance between the restricting surface 13a and the restricting surface 14a is assumed to be Mx4, which is required so that the bolt 6 will not be uninsertable to the nut 5. In this case, the distance Wd3 is defined so that the following equation (6) is satisfied. The value of the distance Wd3 may be smaller than the value of the distance Wd1 in the retaining portion 16. However, the value of the distance Wd3 is not limited to this, and may be the same or substantially the same as the value of the distance Wd1 in the retaining portion 16.
Wd3≤Mx4 (6)
The tapered surfaces 13b, 14b are inclined with respect to the first direction X and the third direction Z, respectively. The tapered surfaces 13b, 14b are inclined so that the distance between the tapered surfaces 13b and 14b becomes greater toward the inlet of the recessed portion 10. The tapered surfaces 13b, 14b introduce the nut 5 between the restricting surfaces 13a, 14a.
In a state where the rotation of the nut 5 is restricted, the bolt 6 is further rotated relative to the nut 5, so that the nut 5 is pulled out from the retaining portion 16, as illustrated in
As illustrated in
The housing 2 according to the present embodiment is configured to allow movement of the busbars 4 along the second direction Y. For example, as illustrated in
The width of the first through hole 24 and the second through hole 25 is large enough to allow the second terminal portions 41b and 42b to move along the second direction Y. For example, as illustrated in
The conductor connecting structure 100 according to the present embodiment also allows the second busbar 42 to move in the second direction Y. As illustrated in
In the conductor connecting structure 100 according to the present embodiment, the direction in which the movement of the nuts 5 is allowed is a direction that is unlikely to affect the sealing performance by the sealing members 7. As illustrated in
As explained above, the conductor connecting structure 100 according to the embodiment includes the crimping terminals 3, the busbars 4, the housing 2, the nuts 5, and the bolts 6. The crimping terminals 3 are first conductors having the flat plate terminal portions 31. The busbars 4 are second conductors having the flat plate first terminal portions 41a, 42a. The housing 2 is a support having the recessed portions 10. The nuts 5 are first screw members housed in the recessed portions 10. The bolts 6 are second screw members that co-fasten the terminal portions 31 and the first terminal portions 41a, 42a by screwing to the nuts 5.
The recessed portion 10 have the first wall surface 11 and the second wall surface 12, which are opposite to each other in the second direction Y, and the restricting surfaces 13a, 14a. The restricting surfaces 13a and 14a connect the first wall surface 11 and the second wall surface 12 along the second direction Y, and are the surfaces that restrict the rotation of the nut 5. The first wall surface 11 and the second wall surface 12 configure the retaining portion 16 and the allowable portion 17. The retaining portion 16 is located at the bottom of the recessed portion 10 and retains the nut 5 before being screwed to the bolt 6. The allowable portion 17 is located closer to the inlet of the recessed portion 10 than the retaining portion 16. The distance Wd2 between the first wall surface 11 and the second wall surface 12 in the allowable portion 17 is greater than the distance Wd1 between the first wall surface 11 and the second wall surface 12 in the retaining portion 16. The conductor connecting structure 100 according to the present embodiment can allow movement of the nut 5 along the second direction Y, which is the opposing direction. In other words, the conductor connecting structure 100 according to the present embodiment allows position adjustment of the busbar 4 in a direction intersecting the fastening direction by the nuts 5 and the bolts 6.
According to the present embodiment, the first screw member is the nut 5 and the second screw member is the bolt 6. The bolt 6 is screwed to the nut 5 and rotated relative to the nut 5, thereby pulling the nut 5 out of the retaining portion 16. In other words, the nut 5 is retained by the retaining portion 16 when the screwing begins and is pulled out from the retaining portion 16 by the time the co-fastening is complete. The nut 5 pulled out from the retaining portion 16 is located in the space corresponding to the allowable portion 17 and is allowed to move along the second direction Y.
The recessed portion 10 according to the present embodiment has the third wall surface 13 and the fourth wall surface 14 that face each other and connect the first wall surface 11 and the second wall surface 12 along the second direction Y. Each of the third and the fourth wall surfaces 13 and 14 restricts rotation of the nut 5 as the restricting surfaces 13a and 14a. The rotation of the nut 5 is restricted by the third and the fourth wall surfaces 13 and 14, so that the screwing of the bolt 6 to the nut 5 is properly performed.
The support according to the present embodiment is the housing 2 of the connector 1. The second conductors are the busbars 4 having the first terminal portions 41a, 42a connected to the crimping terminals 3 and the second terminal portions 41b, 42b connected to the mating terminal 202. The busbars 4 are bent so that the first terminal portions 41a, 42a and the second terminal portions 41b, 42b are orthogonal to each other. The second direction Y, which is the opposing direction, is orthogonal to the main surfaces 41g, 41h of the second terminal portions 41b, 42b. This facilitates the absorption of tolerances in the connection of the mating terminal 202 to the second terminal portions 41b, 42b.
The housing 2 according to the present embodiment has the guide ribs 27A, 27B guiding the first terminal portions 41a, 42a along the second direction Y, which is the opposing direction. Therefore, the movement of the first terminal portions 41a, 42a along the second direction Y is smoothly performed.
The first conductors according to the present embodiment are the crimping terminals 3 connected to the wires W. The support is the housing 2 of the connector 1. A portion between the outer peripheral surface of the wires W and the housing 2 is sealed by the sealing members 7. The opposing direction is the second direction Y, which is orthogonal to the axial direction of the wires W. Therefore, the busbars 4 can be allowed to move without affecting the sealing performance of the seal members 7.
The first screw members accommodated in the recessed portions 10 may be the bolts 6. In this case, the head portions 6b of the bolts 6 are housed in the recessed portions 10. The male screw portions 6a partially protrude from the recessed portions 10, and are inserted into the through holes 41c, 42c of the first terminal portions 41a, 42a and the through holes 31a of the terminal portions 31. The nuts 5 are screwed to the male screw portions 6a and pull out the head portions 6b from the retaining portions 16 by rotation.
The shape of the nuts 5 accommodated in the recessed portions 10 and the shape of the head portions 6b of the bolts 6 accommodated in the recessed portions 10 are not limited to a rectangle. Instead of the rectangle, a polygon such as a hexagon may be adopted. The number of busbars 4 that the connector 1 has is not limited to two. The first conductors are not limited to the crimping terminals 3 connected to the wires W. The conductor connecting structure 100 may connect the busbars to each other. The conductor connecting structure 100 may co-fasten three or more terminal portions.
The fitting object of the connector 1 may be a fitting portion in the case body of the mating device. The object to which the conductor connecting structure 100 is applied is not limited to the connector 1. For example, the conductor connecting structure 100 can be applied to a terminal block. The conductor connecting structure 100 can be applied to various locations where a plurality of conductors are co-fastened by screw members.
The contents disclosed in the above-described embodiments and modifications can be combined as appropriate.
In a conductor connecting structure according to the embodiment, first and second wall surfaces of each recessed portion configure a retaining portion located at the bottom of the recessed portion and retaining a first screw member before being screwed to a second screw member, and an allowable portion located closer to the inlet of the recessed portion than the retaining portion. The distance between the first and the second wall surfaces in the allowable portion is greater than the distance between the first and the second wall surfaces in the retaining portion. The conductor connecting structure according to the embodiment provides the effect of enabling positional adjustment of conductors in a direction that intersects a fastening direction by the screw members.
Although the invention has been described with respect to specific embodiments for a complete and clear disclosure, the appended claims are not to be thus limited but are to be construed as embodying all modifications and alternative constructions that may occur to one skilled in the art that fairly fall within the basic teaching herein set forth.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2020-001241 | Jan 2020 | JP | national |
