Patent Application
20250003183
This application claims the benefit of priority to Japanese Patent Application No. 2023-107901 filed on Jun. 30, 2023. The entire contents of this application are hereby incorporated herein by reference.
The present invention relates to a working machine such as a backhoe.
In a working machine disclosed in Japanese Unexamined Patent Application Publication No. 2021-4488, a control unit (controller) that controls an action of the working machine is disposed at a position near the front and inside a cover body covering a machine body, that is, at a position near the front and beside a prime mover.
Meanwhile, the inside of a machine body is likely to be at a high temperature with heat of a prime mover. In particular, an appropriate measure against heat is desired for a controller that controls an action of a working machine even though the controller is provided at a position separated from the prime mover similarly to the above-described working machine of the related art. As a measure for preventing an increase in temperature of the controller, for example, it is conceivable to dispose the controller so as to face a ventilation surface portion of a radiator, thereby causing cooling air for cooling the radiator to hit the controller. However, when the controller is disposed to face the ventilation surface portion of the radiator, the flow of the cooling air to the radiator is partially blocked, and cooling efficiency of the radiator may be reduced.
The present invention is made to solve such a problem, and an object of the present invention is to provide a working machine capable of efficiently cooling a cooler and a controller.
The following is a technical solution employed by the present invention to attain the object.
A working machine according to the present invention includes a machine body, a prime mover mounted on the machine body, a cooling fan to generate cooling air for cooling the prime mover, a cooler having a ventilation surface portion on which the cooling air hits, to cool a coolant to be circulated and supplied to the prime mover, and a controller. The cooler and the controller are disposed upstream of the prime mover in a flow direction of the cooling air, and the controller is disposed at a position not overlapping the ventilation surface portion when viewed in the flow direction.
The controller may be disposed below the cooler.
The working machine may include a shielding plate to provide partition between a prime mover chamber in which the prime mover is disposed and a space in which the controller is disposed. The controller may be disposed at a position facing a surface of the shielding plate opposite to the prime mover chamber.
The working machine may include a heat insulating member to cover a surface of the shielding plate near the prime mover chamber.
The working machine may include a battery to supply electric power to an electrical component including the controller mounted on the working machine, and the battery may be disposed at a position facing the controller with a first space, through which the cooling air F1 is able to flow, interposed therebetween.
The battery may be disposed above a bottom portion base plate of the machine body with a second space, through which the cooling air is able to flow, interposed with respect to the bottom portion base plate, and the second space may communicate with the first space in a downstream area of the second space in the flow direction of the cooling air.
A cover body defining an outer shell of the machine body may include a first outside air inlet provided at a position overlapping the ventilation surface portion when viewed in the flow direction, and a second outside air inlet provided lower than the first outside air inlet to cause the second space to communicate with an external space of the cover body.
The working machine may include a battery bracket attached to the bottom portion base plate, to support the battery. The battery bracket may include a base plate to support the battery from below, and the second space may be defined by the base plate and the bottom portion base plate.
The base plate may have a first communication opening to allow the cooling air to flow from the second space to the first space.
The working machine may include an intermediate frame to support the cooler from below. The intermediate frame has a second communication opening to allow the cooling air to flow from the first space to a space in which the cooler is disposed.
The second communication opening may be provided above the controller.
The above and other elements, features, steps, characteristics and advantages of the present invention will become more apparent from the following detailed description of the example embodiments with reference to the attached drawings.
A more complete appreciation of example embodiments of the present invention and many of the attendant advantages thereof will be readily obtained as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings described below.
Example embodiments will now be described with reference to the accompanying drawings, wherein like reference numerals designate corresponding or identical elements throughout the various drawings. The drawings are to be viewed in an orientation in which the reference numerals are viewed correctly.
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As illustrated in
In the present embodiment, a direction in which the operator seated on the operator's seat 6 faces (a direction of arrow X1 in
The traveling device 3 is a crawler type traveling device that supports the machine body 2 so as to be capable of traveling, and includes a traveling frame 3A and at least one traveling mechanism 3B. The traveling frame (track frame) 3A is a structure body to which the traveling mechanism 3B is attached on each of the left and right and that supports the machine body 2 from below. The traveling mechanism 3B is, for example, a crawler. The traveling mechanism 3B is driven by a traveling motor M1 provided in the traveling frame 3A. Note that the traveling device 3 is not limited to of the crawler type, and may be of a wheel type.
The traveling device 3 includes a dozer device 7. The dozer device 7 is provided at a front portion of the traveling frame 3A. The dozer device 7 is coupled to a dozer cylinder (hydraulic cylinder) provided in the traveling frame 3A, and is raised/lowered by the dozer cylinder being extended/contracted.
The working device 4 includes a boom 4A, an arm 4B, and a bucket 4C. Note that, instead of or in addition to the bucket 4C, another working tool (hydraulic attachment) that can be driven with a hydraulic fluid can be attached to the working machine 1. Examples of the other working tool include a hydraulic breaker, a hydraulic crusher, an angle broom, an earth auger, a pallet fork, a sweeper, a mower, and a snow blower.
The boom 4A is pivotally attached to a swing bracket 9 provided at a front portion of the machine body 2 so as to be swingable about a horizontal axis (an axis extending in the left-right direction). The boom 4A is coupled to the swing bracket 9 via a boom cylinder (hydraulic cylinder) C1, and is swung about the horizontal axis by the boom cylinder C1 being extended/contracted. Note that the swinging of the boom 4A is an action of raising the boom 4A upward in front of the machine body 2 or tilting the boom 4A forward of the machine body 2.
The arm 4B is pivotally attached to a distal end portion of the boom 4A so as to be swingable about a horizontal axis (an axis extending in the left-right direction). The arm 4B is coupled to the boom 4A via an arm cylinder (hydraulic cylinder) C2, and is swung about the horizontal axis by the arm cylinder C2 being extended/contracted. Note that the swinging of the arm 4B is an action of moving a distal end of the arm 4B toward the machine body 2 (crowding) or away from the machine body 2 (dumping).
The bucket 4C is pivotally attached to a distal end portion of the arm 4B so as to be swingable about a horizontal axis (an axis extending in the left-right direction). The bucket 4C is coupled to the arm 4B via a bucket cylinder (hydraulic cylinder) C3, and is swung about the horizontal axis by the bucket cylinder C3 being extended/contracted. Note that the swinging of the bucket 4C is an action of moving a distal end of the bucket 4C toward the machine body 2 (crowding) or away from the machine body 2 (dumping), and is, for example, an action of shoveling earth and sand or the like with the bucket 4C or dropping (discharging) the shoveled earth and sand or the like from the bucket 4C.
As illustrated in
A support bracket 8J that supports the working device 4 is provided at a front portion of the turning base plate 8. The support bracket 8J is provided to protrude forward from the front portion of the machine body 2, and the swing bracket 9 is connected to a distal end portion of the support bracket 8J. The swing bracket 9 is pivotally attached to the distal end portion of the support bracket 8J so as to be swingable about a vertical axis (an axis extending in the up-down direction). The swing bracket 9 is coupled to a swing cylinder (hydraulic cylinder) provided in the machine body 2, and is swung about the vertical axis by the swing cylinder being extended/contracted.
As illustrated in
In addition to the operator's seat 6, a traveling lever 11, an operation lock lever (unload lever) 12, manipulating levers 13L and 13R, a dozer lever 14, at least one operation switch 15, and at least one armrest 16 are provided in an upper portion of the machine body 2. The traveling lever 11 is an operation member for operating the traveling device 3, and is provided forward of the operator's seat 6. The operation lock lever 12 is an operation member for switching a hydraulic actuator mounted on the working machine 1 between an operable state and an inoperable state, and is provided at a left side portion of a left console portion 17L provided leftward of the operator's seat 6.
The manipulating levers 13L and 13R are operation members for operating the
machine body 2 and the working device 4, and are provided at the left console portion 17L provided leftward of the operator's seat 6 and a right console portion 17R provided rightward of the operator's seat 6, respectively. The dozer lever 14 is an operation member for operating the dozer device 7, and is provided rightward and rearward of the manipulating lever (right manipulating lever) 13R at the right console portion 17R.
The operation switch 15 includes a plurality of operation switches 15 that are operation members for operating various devices provided in the working machine 1 and are provided rearward of the dozer lever 14 at the right console portion 17R. The armrest 16 is a member on which an elbow and the like of the operator seated on the operator's seat 6 is placed, and is provided rearward of each of the manipulating levers 13L and 13R at the left and right console portions 17L and 17R.
As illustrated in
The prime mover 21 of the present embodiment is a diesel engine. As illustrated in
The hydraulic pump 22 is a device that is driven with power of the prime mover 21 and supplies a hydraulic fluid (pressure fluid) to hydraulic actuators such as hydraulic motors or hydraulic cylinders (swing cylinder, dozer cylinder, boom cylinder C1, arm cylinder C2, bucket cylinder C3) provided in the working machine 1. As illustrated in
The radiator 23 is a cooler that cools a coolant that is circulated and supplied to the prime mover 21. The oil cooler 24 is a cooler that cools a hydraulic fluid that is supplied to the hydraulic actuators. The radiator 23 and the oil cooler 24 are both disposed in a space S2 located leftward of the support frame 20 in the outer cover 10.
The reserve tank 25 is a device that stores the coolant. The reserve tank 25 is disposed in a space S3 located rearward of the support frame 20 in the outer cover 10. The battery 26 is a storage battery that supplies electric power to electrical components including a work lamp, a display, and meters (not illustrated), and the controller 28 mounted on the working machine 1.
The battery 26 is disposed in the left space S2 of the support frame 20. The battery 26 is attached to an upper portion of the turning base plate 8 via a battery bracket 30. An attachment structure of the battery 26 will be described later.
The isolator 27 is a device that supplies electricity generated by an alternator 31 to the battery 26. The isolator 27 is disposed in the rear space S3 of the support frame 20.
The controller 28 is a device (electronic control unit, ECU) that controls actions of various devices (some or all of devices such as the prime mover 21, the hydraulic pump 22, a hydraulic control valve, a cooling device, an attachment, a display, an operation device, an illumination device, a blower, an air conditioner, a communication device, an imaging device, an alarm device, and various sensors) mounted on the working machine 1. The controller 28 is disposed in the left space S2 of the support frame 20.
As illustrated in
A cooling fan 33 is provided at a left side portion of the prime mover 21. The cooling fan 33 is coupled to the drive shaft 21P of the prime mover 21 via the power transmission belt 32, and is rotationally driven with the rotational power of the prime mover 21 to generate cooling air F1 for cooling the prime mover 21 inside the machine body 2.
As illustrated in
The hood 10T that covers the prime mover 21 includes the first cover body 10A, the second cover body 10B, the third cover body 10C, and the fourth cover body 10D. The first cover body 10A, the second cover body 10B, the third cover body 10C, and the fourth cover body 10D are supported by the support frame 20 (see
As illustrated in
covers the front and upper side of the prime mover 21, and is fixed to left and right front pillar portions 20A and a rear upper frame portion 20E (see
The second cover body 10B is a cover member that covers the rear of the prime mover 21 (an upper region of the rear space S3 of the support frame 20), and a right side edge portion of the second cover body 10B is coupled to and supported by a right rear pillar portion 20B (see
The third cover body 10C is a cover member that covers the left of the prime mover 21 (an upper region of the left space S2 of the support frame 20), and a front edge portion of the third cover body 10C is coupled to and supported by the left front pillar portion 20A (see
The third cover body 10C has a first outside air inlet 41. The first outside air inlet 41 is an air intake for taking outside air into the machine body 2. The first outside air inlet 41 is covered with a member having air permeability, such as a perforated metal, an expanded metal, or a welded wire mesh.
The fourth cover body 10D is a cover member that covers the right of the prime mover 21, and is fixed to a side surface cover 10R (see
As illustrated in
As illustrated in
The fifth cover body 10E has a second outside air inlet (outside air inlet) 43. The second outside air inlet 43 is an air intake for taking outside air into the machine body 2. The second outside air inlet 43 includes a plurality of slits. Note that the second outside air inlet 43 is not limited to the slits, and may include a plurality of small holes, or may be an opening covered with a member having air permeability, such as a perforated metal, an expanded metal, or a welded wire mesh, similarly to the first outside air inlet 41 of the third cover body 10C.
As illustrated in
The front pillar portion 20A includes a pair of front pillar portions 20A disposed forward of the prime mover 21 so as to extend in the up-down direction and to be spaced apart from each other in the left-right direction. The rear pillar portion 20B includes a pair of rear pillar portions 20B disposed rearward of the prime mover 21 so as to extend in the up-down direction and to be spaced apart from each other in the left-right direction.
The upper side frame portion 20C is formed to extend rearward from each of upper portions of the left and right front pillar portions 20A. The upper side frame portions 20C are formed integrally with the front pillar portions 20A. Rear portions of the left and right upper side frame portions 20C are coupled and fixed to upper portions of the rear pillar portions 20B disposed rearward of the rear portions of the upper side frame portions 20C.
The front upper frame portion 20D is provided across the upper portions of the left and right front pillar portions 20A, and couples the upper portions to each other and couples front portions of the left and right upper side frame portions 20C to each other. The rear upper frame portion 20E is provided across the upper portions of the left and right rear pillar portions 20B, and couples the upper portions to each other and couples the rear portions of the left and right upper side frame portions 20C to each other.
The front attachment plate 20F is provided across lower portions of the left and right front pillar portions 20A and couples the lower portions to each other. The front attachment plate 20F is fixed to an upper portion of a partition wall 8A vertically provided on the turning base plate 8, by a bolt or the like. That is, the front pillar portions 20A are vertically provided on the upper portion of the partition wall 8A. The partition wall 8A is vertically provided forward of the prime mover 21 on the turning base plate 8, and provides partition between the prime mover chamber S1 and a space S4 located forward of the support frame 20.
The rear attachment plate 20G is fixed to each of upper portions of a pair of left and right bracket members 8B vertically provided on the turning base plate 8, by a bolt or the like. That is, the rear pillar portions 20B are vertically provided on the upper portions of the pair of bracket members 8B.
Thus, the support frame 20 is a structure body including the four pillar portions 20A and 20B standing on the upper portion of the turning base plate 8 and the plurality of frame portions 20C, 20D, and 20E connecting the pillar portions 20A and 20B substantially horizontally. Note that the support frame 20 is not limited to the configuration of the present embodiment, and can be appropriately changed in accordance with the arrangement, size, and the like of each device mounted on the machine body 2.
As illustrated in
A seal member 45 is provided at an outer side edge portion of the partition member 44. The seal member 45 is in contact with an inner side surface of the outer cover 10 (third cover body 10C). Accordingly, the partition member 44 and the seal member 45 prevent or reduce a flow of the outside air (cooling air F1) taken into the machine body 2 by the cooling fan 33 from the left space S2 to the rear space S3 of the support frame 20.
As illustrated in
The shroud 46 has an air-blowing opening 46A at the center. The air-blowing opening 46A is a substantially circular through hole, and causes the left space S2 of the support frame 20 to communicate with the prime mover chamber S1. The cooling fan 33 is disposed inside the air-blowing opening 46A. That is, the shroud 46 is provided so as to surround the outer periphery of the cooling fan 33.
As illustrated in
Thus, when the cooling fan 33 is actuated, outside air (cooling air F1) is taken into the left space S2 of the support frame 20 through the first outside air inlet 41, and is guided to the air-blowing opening 46A of the shroud 46 through the ventilation surface portion 24F of the oil cooler 24 and the ventilation surface portion 23F of the radiator 23, and is blown to the prime mover 21. Specifically, tubes through which cooling target fluids (coolant, hydraulic fluid) flow and fins attached to the tubes are disposed at the ventilation surface portions 23F and 24F of the radiator 23 and the oil cooler 24, and the cooling air F1 is guided to the air-blowing opening 46A of the shroud 46 through gaps between the tubes and the fins and is blown to the prime mover chamber S1. Accordingly, the cooling air F1 passing through the ventilation surface portions 23F and 24F cools the cooling target fluids (coolant, hydraulic fluid) of the oil cooler 24 and the radiator 23, and the cooling air F1 guided to the prime mover chamber S1 and passing through the periphery of the prime mover 21 cools the prime mover 21 and the like. In other words, the radiator 23 is disposed upstream of the prime mover 21 in the flow direction of the cooling air F1. Thus, the left space S2 of the support frame 20 includes a first cooling air passage extending from the first outside air inlet 41 to the prime mover chamber S1 through an arrangement space S5 of the radiator 23.
As illustrated in
The intermediate frame 47 supports the radiator 23 from below on the left of the prime mover 21. The radiator 23 is attached to an upper portion of the intermediate frame 47 by a bolt or the like. The controller 28 is disposed below the intermediate frame 47, that is, below the radiator 23 (see
As illustrated in
The communication opening 47A is provided above the controller 28. The communication opening 47A is provided at a position facing the controller 28 from above. The communication opening 47A is formed to have a larger opening area in the front-rear direction than the dimension of the controller 28 in the front-rear direction. Note that the communication opening 47A is not limited to the notch, and may be a hole having a substantially quadrangular shape or a substantially circular shape that vertically penetrates the intermediate frame 47. Alternatively, the intermediate frame 47 may include a pair of plate bodies arranged to be spaced apart from each other in the front-rear direction, and the communication opening 47A may be a spaced portion defined between the plate bodies.
The left attachment plate 48 is vertically provided leftward of the prime mover 21 on the upper portion of the turning base plate 8. The left attachment plate 48 extends along a lower surface portion of the intermediate frame 47 between the partition wall 8A and the left bracket member 8B, and supports the intermediate frame 47 from below.
As illustrated in
A shielding plate 49 is provided leftward of the left attachment plate 48 (outside the prime mover chamber S1). The shielding plate 49 is a substantially flat plate-shaped plate body having a size capable of shielding the entire opening 48A, and is fixed to a left side surface of the left attachment plate 48 (outside the prime mover chamber S1) by a bolt or the like to cover the opening 48A from the outside of the prime mover chamber S1. The controller 28 is fixed to a left side surface of the shielding plate 49 (outside the prime mover chamber S1) by a bolt or the like. Thus, the shielding plate 49 provides partition between the prime mover chamber S1 in which the prime mover 21 is disposed and the space S6 in which the controller 28 is disposed, and prevents or reduces a flow of the cooling air F1 (hot air) after cooling the prime mover 21 through heat exchange, remaining heat in the prime mover chamber S1, and the like to the arrangement space S6 of the controller 28.
Note that, as illustrated in
As illustrated in
The shielding plate 49 includes a grommet 52. The grommet 52 is a member through which the harness that is connected to the connecting portion 28A of the controller 28 passes, and that causes the left space S2 of the support frame 20 to communicate with the prime mover chamber S1 through the opening 48A of the left attachment plate 48.
As illustrated in
The battery bracket 30 includes a base plate 53, a lower portion attachment piece 54, at least one side portion attachment piece 55, at least one pillar 56, and a pressing plate 57. The battery 26 is placed on an upper portion of the base plate 53. As illustrated in
The first flange 58A is vertically provided along a front edge portion of the base plate 53, and supports the battery 26 from the front. The second flange 58B is vertically provided along a rear edge portion of the base plate 53, and supports the battery 26 from the rear. The third flange 59A and the fourth flange 59B are vertically provided along a right edge portion (an edge portion near the shielding plate 49) of the base plate 53, and support the battery 26 from the right (from the shielding plate 49 side).
The lower portion attachment piece 54 is provided to protrude downward from a lower surface portion of the base plate 53. A lower end portion of the lower portion attachment piece 54 abuts on an upper surface of the turning base plate 8 and is fixed by a bolt or the like. Thus, the lower portion attachment piece 54 extends from the base plate 53 to the turning base plate 8, and supports the base plate 53 above the turning base plate 8. Accordingly, an outside air introduction passage S7 that guides the outside air (cooling air F1) taken into the machine body 2 to the arrangement space S6 of the controller 28 is defined between the base plate 53 and the turning base plate 8. That is, the battery 26 is disposed above the turning base plate 8 with a predetermined second space (outside air introduction passage) S7, through which the cooling air F1 can flow, interposed with respect to the turning base plate 8.
The side portion attachment piece 55 is provided to protrude rightward from each of a right side portion of the first flange 58A and a right side portion of the second flange 58B, beyond the right edge portion of the base plate 53. A right end portion of the side portion attachment piece 55 abuts on the left side surface of the shielding plate 49 and is fixed by a bolt or the like. Thus, the side portion attachment piece 55 extends from the base plate 53 to the shielding plate 49 (see
The pillar 56 is vertically provided at each of the first flange 58A and the second flange 58B. That is, the pillar 56 is provided to extend upward from each of a front portion and a rear portion of the base plate 53. A lower end of the pillar 56 near the first flange 58A is bent in a substantially L shape, and is detachably engaged with and held by the first flange 58A. A lower end of the pillar 56 near the second flange 58B is fixed to the second flange 58B.
The pressing plate 57 is a plate member long in the front-rear direction and is provided to extend between upper ends of the two front and rear pillars 56. That is, the pressing plate 57 is supported from below by the two front and rear pillars 56. The pressing plate 57 is fixed to the upper ends of the two front and rear pillars 56 by nuts or the like in a state of abutting on an upper portion of the battery 26.
As illustrated in
The communication opening 60 is provided leftward of the controller 28, and expands the gap between the base plate 53 and the controller 28 in the left-right direction. The communication opening 60 is formed to have a larger opening area in the front-rear direction than the dimension of the controller 28 in the front-rear direction. Thus, the battery bracket 30 has the communication opening 60 that allows the cooling air F1 to flow from the outside air introduction passage S7 to the first space S8. Note that the communication opening 60 is not limited to the notch, and may be a substantially quadrangular through hole or a substantially circular through hole formed through the base plate 53. Also, a plurality of communication openings 60 may be provided in the base plate 53.
As illustrated in
The outside air introduction passage S7 communicates with the first space S8 between the battery 26 and the controller 28 in a downstream area of the outside air introduction passage S7 in the flow direction of the cooling air F1. The controller 28 is disposed in the downstream area of the outside air introduction passage S7 in the left space S2 of the support frame 20.
Thus, when the cooling fan 33 is actuated, the outside air (cooling air F1) is taken into the left space S2 of the support frame 20 through the second outside air inlet 43, and is guided to the arrangement space S6 of the controller 28 through the outside air introduction passage S7 below the battery 26. Furthermore, the outside air that has risen in the first space S8 between the battery 26 and the controller 28 is guided to the air-blowing opening 46A of the shroud 46 through the arrangement space S5 of the radiator 23, and is blown to the prime mover 21. Accordingly, the battery 26, the controller 28, the radiator 23, the prime mover 21, and the like are cooled. In other words, the controller 28 is disposed upstream of the prime mover 21 in the flow direction of the cooling air F1. Thus, the left space S2 of the support frame 20 includes a second cooling air passage extending from the second outside air inlet 43 to the prime mover chamber S1 through the arrangement space S6 of the controller 28.
Note that, in the above-described embodiment, the radiator (cooler) 23 is disposed leftward of the prime mover 21. However, the radiator 23 may be disposed rightward of the prime mover 21, or may be disposed forward or rearward of the prime mover 21, as long as the radiator 23 is disposed upstream of the prime mover 21 in the flow direction of the cooling air F1.
Also, in the above-described embodiment, the controller 28 is disposed below the radiator (cooler) 23. However, the controller 28 may be disposed above the radiator 23, forward or rearward of the radiator 23, or leftward or rightward of the radiator 23, as long as the controller 28 is disposed upstream of the radiator 23 in the flow direction of the cooling air F1.
The present invention provides a working machine 1 described in the following items.
(Item 1) A working machine 1 comprising: a machine body 2; a prime mover 21 mounted on the machine body 2; a cooling fan 33 to generate cooling air F1 for cooling the prime mover 21; a cooler 23 having a ventilation surface portion 23F on which the cooling air F1 hits, to cool a coolant to be circulated and supplied to the prime mover 21; and a controller 28), wherein the cooler 23 and the controller 28 are disposed upstream of the prime mover 21 in a flow direction of the cooling air F1, and the controller 28 is disposed at a position not overlapping the ventilation surface portion 23F when viewed in the flow direction.
With the working machine 1 according to Item 1, the cooling air F1 before cooling the prime mover 21 is guided to the ventilation surface portion 23F of the cooler 23 without being blocked by the controller 28, and hence both the cooler 23 and the controller 28 can be efficiently cooled.
(Item 2) The working machine 1 according to Item 1, wherein the controller 28 is disposed below the cooler 23.
With the working machine 1 according to Item 2, even when the cooling fan 33 is stopped, heat released from the cooler 23 is unlikely to flow to the space S6 in which the controller 28 is disposed, and hence the cooling efficiency of the controller 28 is further improved.
(Item 3) The working machine 1 according to Item 2, comprising: a shielding plate 49 to provide partition between a prime mover chamber S1 in which the prime mover 21 is disposed and a space S6 in which the controller 28 is disposed, wherein the controller 28 is disposed at a position facing a surface of the shielding plate 49 opposite to the prime mover chamber S1.
With the working machine 1 according to Item 3, a flow of the cooling air F1 after cooling the prime mover 21 through heat exchange, remaining heat in the prime mover chamber S1, radiant heat from the prime mover 21, and the like to the space S6, in which the controller 28 is disposed, can be prevented or reduced. Hence the cooling efficiency of the controller 28 is further improved.
(Item 4) The working machine 1 according to Item 3, comprising a heat insulating member 51 to cover a surface of the shielding plate 49 near the prime mover chamber S1.
With the working machine 1 according to Item 4, transfer of heat of the cooling air F1 after cooling the prime mover 21 through heat exchange, remaining heat in the prime mover chamber S1, radiant heat from the prime mover 21, and the like to the controller 28 can be more effectively prevented or reduced. Hence the cooling efficiency of the controller 28 is further improved.
(Item 5) The working machine 1 according to Item 3 or 4, comprising: a battery 26 to supply electric power to an electrical component including the controller 28 mounted on the working machine 1, wherein the battery 26 is disposed at a position facing the controller 28 with a first space S8, through which the cooling air F1 is able to flow, interposed therebetween.
With the working machine 1 according to Item 5, the cooling air F1 can be reliably brought into contact with the controller 28 by the cooling air F1 being caused to flow through the first space S8 between the battery 26 and the controller 28. Hence the cooling efficiency of the controller 28 is further improved. Accordingly, the thermal load on the controller 28 can be further reduced.
(Item 6) The working machine 1 according to Item 5, wherein the battery 26 is disposed above a bottom portion base plate 8 of the machine body 2 with a second space S7, through which the cooling air F1 is able to flow, interposed with respect to the bottom portion base plate 8, and the second space S7 communicates with the first space S8 in a downstream area of the second space S7 in the flow direction of the cooling air F1.
With the working machine 1 according to Item 6, the cooling air F1 can be reliably guided to the first space S8 through the second space S7 between the bottom portion base plate 8 and the battery 26. Hence the cooling efficiency of the controller 28 is further improved. Accordingly, the thermal load on the controller 28 can be further reduced.
(Item 7) The working machine 1 according to Item 6, wherein a cover body 10 defining an outer shell of the machine body 2 includes a first outside air inlet 41 provided at a position overlapping the ventilation surface portion 23F when viewed in the flow direction, and a second outside air inlet 43 provided lower than the first outside air inlet 41 to cause the second space S7 to communicate with an external space of the cover body 10.
With the working machine 1 according to Item 7, the cooling air F1 can be reliably guided from the second outside air inlet 43 to the first space S8 through the second space S7. Hence the cooling efficiency of the controller 28 is further improved. Accordingly, the thermal load on the controller 28 can be further reduced.
(Item 8) The working machine 1 according to Item 6, comprising: a battery bracket 30 attached to the bottom portion base plate 8, to support the battery 26, wherein the battery bracket 30 includes a base plate 53 to support the battery 26 from below, and the second space S7 is defined by the base plate 53 and the bottom portion base plate 8.
With the working machine 1 according to Item 8, the outside air (cooling air F1) taken into the machine body 2 by the cooling fan 33 is rectified by passing through the second space S7 defined by the base plate 53 of the battery bracket 30 and the bottom portion base plate 8, and is guided to the first space S8 between the battery 26 and the controller 28. Hence the cooling efficiency of the controller 28 is further improved. Accordingly, the thermal load on the controller 28 can be further reduced.
(Item 9) The working machine 1 according to Item 8, wherein the base plate 53 has a first communication opening 60 to allow the cooling air F1 to flow from the second space S7 to the first space S8.
With the working machine 1 according to Item 9, the cooling air F1 can be reliably guided from the second space S7 to the first space S8 through the first communication opening 60 provided in the base plate 53 of the battery bracket 30. Hence the cooling efficiency of the controller 28 is further improved. Accordingly, the thermal load on the controller 28 can be further reduced.
(Item 10) The working machine 1 according to any one of Items 5 to 9, comprising: an intermediate frame 47 to support the cooler 23 from below, wherein the intermediate frame 47 has a second communication opening 47A to allow the cooling air F1 to flow from the first space S8 to a space S5 in which the cooler 23 is disposed.
With the working machine 1 according to Item 10, the flow of the cooling air F1 in the first space S8 is stabilized by the cooling air F1 being caused to flow from the first space S8 to the space S5, in which the cooler 23 is disposed, through the second communication opening 47A provided in the intermediate frame 47. Hence the cooling efficiency of the controller 28 is further improved. Accordingly, the thermal load on the controller 28 can be further reduced.
(Item 11) The working machine 1 according to Item 10, wherein the second communication opening 47A is provided above the controller 28.
With the working machine 1 according to Item 11, the cooling air F1 flowing to the space S5, in which the cooler 23 is disposed, through the first space S8 can be reliably brought into contact with the controller 28. Hence the cooling efficiency of the controller 28 is further improved. Accordingly, the thermal load on the controller 28 can be further reduced.
While example embodiments of the present invention have been described above, it is to be understood that variations and modifications will be apparent to those skilled in the art without departing from the scope and spirit of the present invention. The scope of the present invention, therefore, is to be determined solely by the following claims.
Also, in the above-described embodiment, the example has been described in which the present invention is applied to the working machine such as a backhoe. However, an application target of the present invention is not limited to the working machine such as a backhoe, and may be applied to a construction machine such as a wheel loader, a compact track loader, or a skid-steer loader, or may be applied to an agricultural machine such as a tractor, a combine, a rice transplanter, or a lawn mower.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2023-107901 | Jun 2023 | JP | national |
