Work machine

Abstract

To provide a work machine such as a backhoe allowing a cooler and a control device to be efficiently cooled.SOLUTION: A work machine is provided with: a machine body; a motor mounted on the machine body; a cooling fan generating cooling air cooling the motor; a cooler having a ventilation surface against which the cooling air blows and cooling coolant circulated and supplied to the motor; and a control device. The cooler and the control device are placed at an upper side of a flow direction of the cooling air relating to the motor, and the control device is placed at a position not overlapping with the ventilation surface in a view from the flow direction of the cooling air.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a work machine such as a backhoe. [Background technology]

[0002] The working machine disclosed in Patent Document 1 has a controller (control device) that controls the operation of the working machine disposed at a front inner position of a cover body that covers the machine body, that is, at a front lateral position of the prime mover. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-4488 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the inside of the machine body is likely to become hot due to the heat of the prime mover, and appropriate heat countermeasures are required, especially for the control device that controls the operation of the work machine, even if it is located away from the prime mover as in the above-mentioned conventional work machine. Therefore, as a countermeasure to prevent the temperature rise of the control device, for example, it is considered to arrange the control device facing the ventilation surface of the radiator so that the cooling air that cools the radiator is directed at the control device. However, if the control device is arranged facing the ventilation surface of the radiator, the flow of the cooling air to the radiator is partially obstructed, and there is a risk that the cooling efficiency of the radiator will decrease.

[0005] The present invention has been made to solve such problems, and has an object to provide a work machine capable of efficiently cooling a cooler and a control device. [Means for solving the problem]

[0006] The present invention employs the following technical means to achieve the above object.

[0007] A working machine according to one embodiment of the present invention comprises a body, a prime mover mounted on the body, a cooling fan that generates cooling air to cool the prime mover, a cooler having a ventilation surface against which the cooling air hits and that cools a cooling liquid that is circulated and supplied to the prime mover, and a control device, wherein the cooler and the control device are arranged upstream of the flow direction of the cooling air relative to the prime mover, and the control device is arranged in a position that does not overlap with the ventilation surface when viewed from the flow direction. Effect of the Invention

[0008] According to the above-described working machine, both the cooler and the control device can be efficiently cooled by the cooling air before cooling the prime mover. [Brief description of the drawings]

[0009] [Figure 1] FIG. [Diagram 2] FIG. [Diagram 3] 1 is a left rear perspective view of the fuselage with the cover body partially separated. FIG. [Figure 4] FIG. 2 is a left rear perspective view showing the internal structure of the aircraft. [Diagram 5] FIG. 2 is a rear view showing the internal structure of the aircraft. [Figure 6] FIG. 2 is a left rear perspective view of the bottom substrate and support frame. [Figure 7] FIG. [Figure 8] FIG. [Figure 9] FIG. 2 is a partially exploded perspective view of the control device and its periphery. [Figure 10] FIG. [Figure 11] FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0011] As shown in Figs. 1 and 2, the working machine 1 of this embodiment is a backhoe equipped with a machine body (swivel base) 2, a traveling device 3, and a working device 4. A canopy 5 is mounted on the machine body 2. A driver's seat 6 in which an operator (driver) sits is provided inside the canopy 5. The canopy 5 is a protection mechanism for protecting the driver's seat 6, and has a roof protector 5A and a roof 5B. The working machine 1 is not limited to a backhoe, and may be another type of working machine. Also, the machine body 2 may be equipped with a cabin surrounding the driver's seat 6 instead of the canopy 5 as a protection mechanism for protecting the driver's seat 6.

[0012] In this embodiment, the direction in which the operator seated in the driver's seat 6 faces (the direction of the arrow X1 in Figs. 1 and 2) is the front of the machine body 2, and the opposite direction (the direction of the arrow X2 in Figs. 1 and 2) is the rear of the machine body 2. The left side of the operator (the direction of the arrow Y1 in Fig. 2) is the left side of the machine body 2, and the opposite direction (the direction of the arrow Y2 in Fig. 2) is the right side of the machine body 2. Furthermore, the upper side of the operator (the direction of the arrow Z1 in Figs. 1 and 2) is the top of the machine body 2, and the opposite direction (the direction of the arrow Z2 in Figs. 1 and 2) is the bottom of the machine body 2.

[0013] The traveling device 3 is a crawler type traveling device that supports the machine body 2 so that it can travel, and includes a traveling frame 3A and a traveling mechanism 3B. The traveling frame (track frame) 3A is a structure to which the traveling mechanisms 3B are attached on the left and right sides and 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 on the traveling frame 3A. Note that the traveling device 3 is not limited to a crawler type, and may be a wheel type.

[0014] The traveling device 3 is equipped with a dozer device 7. The dozer device 7 is provided at the front of the traveling frame 3A. The dozer device 7 is connected to a dozer cylinder (hydraulic cylinder) provided on the traveling frame 3A, and is raised and lowered by extending and contracting the dozer cylinder.

[0015] The working device 4 has a boom 4A, an arm 4B, and a bucket 4C. Note that, instead of or in addition to the bucket 4C, the working machine 1 can be equipped with another working tool (hydraulic attachment) that can be driven by hydraulic oil. 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.

[0016] The boom 4A is pivotally mounted to a swing bracket 9 provided at the front 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 connected to the swing bracket 9 via a boom cylinder (hydraulic cylinder) C1, and is swung about the horizontal axis by extending and contracting the boom cylinder C1. Swinging the boom 4A refers to the operation of raising the boom 4A above the front of the machine body 2 and tilting it forward of the machine body 2.

[0017] The arm 4B is pivotally attached to the tip of the boom 4A so as to be swingable around a horizontal axis (an axis extending in the left-right direction). The arm 4B is connected to the boom 4A via an arm cylinder (hydraulic cylinder) C2, and is swung around the horizontal axis by extending and contracting the arm cylinder C2. The swinging of the arm 4B refers to the operation of moving the tip of the arm 4B closer to the machine body 2 (crowd) or farther away from the machine body 2 (dump).

[0018] The bucket 4C is pivotally attached to the tip of the arm 4B so as to be swingable around a horizontal axis (an axis extending in the left-right direction). The bucket 4C is connected to the arm 4B via a bucket cylinder (hydraulic cylinder) C3, and is swung around the horizontal axis by extending and contracting the bucket cylinder C3. The swinging of the bucket 4C refers to the operation of moving the tip of the bucket 4C closer to (crowd) the machine body 2 or moving it away from (dump) the machine body 2, for example, the operation of scooping up soil and sand with the bucket 4C and dropping (discharging) the scooped soil and sand from the bucket 4C.

[0019] As shown in FIG. 1, the machine body 2 has a swivel base plate (bottom base plate) 8 that constitutes the bottom of the machine body 2. The swivel base plate 8 is formed of a thick plate material, and is supported on the upper part of the traveling device 3 via a swivel bearing 2J. That is, the machine body 2 is supported rotatably about a pivot axis L1 of the swivel bearing 2J with respect to the traveling device 3. The swivel axis L1 is the center of rotation of the swivel bearing 2J. The swivel base plate 8 is driven to rotate about the pivot axis L1 by a swivel motor provided on the traveling device 3.

[0020] A support bracket 8J that supports the working device 4 is provided at the front of the swivel base plate 8. The support bracket 8J is provided so as to protrude forward from the front of the machine body 2, and a swing bracket 9 is connected to its tip. The swing bracket 9 is pivotally attached to the tip 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 connected to a swing cylinder (hydraulic cylinder) provided on the machine body 2, and is swung about the vertical axis by extending and contracting the swing cylinder.

[0021] As shown in Figs. 1 to 3, a weight 10F is provided at the rear of the swivel base plate 8. The weight 10F is a member for achieving weight balance with the working device 4, and is disposed at the rear of the machine body 2. The weight 10F is formed in a substantially arc shape, and is provided so as to cover the inside of the machine body 2 from the rear. In other words, the weight 10F constitutes a part of the outer cover (cover body) 10 that constitutes the outer shell of the machine body 2.

[0022] Provided on the upper part of the machine body 2 are a driver's seat 6, a travel lever 11, an operation lock lever (unload lever) 12, control levers 13L, 13R, a dozer lever 14, an operation switch 15, and an armrest 16. The travel lever 11 is an operating member for operating the traveling device 3, and is provided in front of the driver's seat 6. The operation lock lever 12 is an operating member for switching the hydraulic actuator mounted on the work machine 1 between an operable state and an inoperable state, and is provided on the left side of the left console unit 17L provided to the left of the driver's seat 6.

[0023] The control levers 13L, 13R are operating members for operating the machine body 2 and the work device 4, and are provided on a left console section 17L provided to the left of the driver's seat 6, and a right console section 17R provided to the right of the driver's seat 6. The dozer lever 14 is an operating member for operating the dozer device 7, and is provided to the right rear of the control lever (right control lever) 13R on the right console section 17R.

[0024] The operation switches 15 are operation members for operating various devices equipped on the work machine 1, and a plurality of operation switches 15 are provided on the right console section 17R behind the dozer lever 14. The armrests 16 are members on which the operator seated in the driver's seat 6 places his / her elbows, and are provided on the left and right console sections 17L, 17R behind the control levers 13L, 13R, respectively.

[0025] As shown in Figures 3 and 4, a support frame 20 is provided inside the aircraft body 2. The aircraft body 2 also carries devices such as a prime mover 21, a hydraulic pump 22, a radiator 23, an oil cooler 24, a reserve tank 25, a battery 26, an isolator 27, and a control device 28. An outer cover (cover body) 10 constituting the outer shell of the aircraft body 2 includes a bonnet 10T that covers the prime mover 21. The support frame 20 supports the bonnet 10T.

[0026] The prime mover 21 in this embodiment is a diesel engine. As shown in Fig. 1 and Fig. 3, the prime mover 21 is disposed in a space (prime mover chamber) S1 below the driver's seat 6 and inside the support frame 20. Note that the prime mover 21 is not limited to a diesel engine, and may be a gasoline engine, an electric motor, or a hybrid prime mover having an engine and an electric motor.

[0027] The hydraulic pump 22 is a device that is driven by the power of the prime mover 21 and supplies hydraulic oil (pressurized oil) to hydraulic actuators such as hydraulic motors and hydraulic cylinders (swing cylinder, dozer cylinder, boom cylinder C1, arm cylinder C2, bucket cylinder C3) equipped in the work machine 1. As shown in Figures 4 and 5, the hydraulic pump 22 is connected to the right side of the prime mover 21.

[0028] The radiator 23 is a cooler that cools the coolant that is circulated and supplied to the prime mover 21. The oil cooler 24 is a cooler that cools the hydraulic oil that is supplied to the hydraulic actuator. Both the radiator 23 and the oil cooler 24 are disposed in the space S2 to the left of the support frame 20 inside the outer cover 10.

[0029] The reserve tank 25 is a device for storing coolant. The reserve tank 25 is disposed in a space S3 behind the support frame 20 inside the outer cover 10. The battery 26 is a storage battery that supplies power to electrical equipment including a work light, a display device, gauges, and a control device 28 (not shown) mounted on the work machine 1.

[0030] The battery 26 is disposed in the space S2 to the left of the support frame 20. The battery 26 is attached to the upper part of the swivel base plate 8 via a battery bracket 30. The attachment structure of the battery 26 will be described later.

[0031] The isolator 27 is a device that supplies electricity generated by the alternator 31 to the battery 26. The isolator 27 is disposed in the rear space S3 of the support frame 20.

[0032] The control device 28 is an electronic control unit (ECU) that controls the operation of various devices (part or all of the devices such as the prime mover 21, hydraulic pump 22, hydraulic control valve, cooling device, attachment, display device, operating device, lighting device, blower, air conditioner, communication device, imaging device, alarm device, various sensors, etc.) mounted on the work machine 1. The control device 28 is disposed in the left space S2 of the support frame 20.

[0033] 5, an alternator 31 is provided at the rear of the prime mover 21. The alternator 31 is connected to the drive shaft 21P of the prime mover 21 via a power transmission belt 32, and is rotationally driven by the rotational power of the prime mover 21 to generate electricity to be stored in the battery 26.

[0034] A cooling fan 33 is provided on the left side of the prime mover 21. The cooling fan 33 is connected to the drive shaft 21P of the prime mover 21 via a power transmission belt 32, and is rotationally driven by the rotational power of the prime mover 21 to generate cooling air F1 that cools the prime mover 21 inside the airframe 2.

[0035] 2 and 3, the outer cover 10 has a first cover body 10A arranged on the upper part of the body 2 and below the driver's seat 6, a second cover body 10B arranged on the upper side of the rear part of the body 2, a third cover body 10C arranged on the upper side of the left side of the body 2, a fourth cover body 10D arranged on the upper side of the right side of the body 2, a fifth cover body 10E arranged on the lower side of the left side of the body 2, and a weight 10F arranged on the lower side of the rear part of the body 2. Furthermore, although not shown, the outer cover 10 has a sixth cover body arranged on the lower side of the right side of the body 2 and a seventh cover body arranged on the front part of the body 2.

[0036] A bonnet 10T covering the prime mover 21 includes a first cover body 10A, a second cover body 10B, a third cover body 10C, and a 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 each supported by a support frame 20 (see FIG. 4).

[0037] As shown in Figures 1 and 3, the first cover body 10A is a cover member that covers the front and upper part of the prime mover 21, and is fixed to the left and right front support portions 20A and the rear upper frame 20E (see Figure 4) of the support frame 20 by bolts or the like.

[0038] The second cover body 10B is a cover member that covers the rear of the prime mover 21 (the upper area of ​​the rear space S3 of the support frame 20), and its right edge is connected and supported by a hinge mechanism to the right rear support column 20B (see FIG. 4) of the support frame 20. That is, the second cover body 10B is pivotally connected to the right rear support column 20B of the support frame 20 so as to be swingable about a vertical axis (an axis extending in the vertical direction). The isolator 27 and the reserve tank 25 are disposed inside (in front of) the second cover body 10B. Therefore, an operator can access the isolator 27, the reserve tank 25, the prime mover 21, etc. from the rear of the machine body 2 by swinging the second cover body 10B to the outside (rear) of the machine body 2 to open it.

[0039] The third cover body 10C is a cover member that covers the left side of the prime mover 21 (the upper area of ​​the left space S2 of the support frame 20), and its front edge is connected and supported by a hinge mechanism to the left front support column 20A (see FIG. 4) of the support frame 20. That is, the third cover body 10C is pivotally connected to the left front support column 20A of the support frame 20 so as to be swingable about a vertical axis (an axis extending in the vertical direction). The radiator 23 and the oil cooler 24 are disposed inside (to the right) of the third cover body 10C. The battery 26 is disposed inside and below (to the right) of the third cover body 10C. Therefore, an operator can access the radiator 23, the oil cooler 24, the battery 26, etc. from the left side of the machine body 2 by swinging the third cover body 10C to the outside (to the left) of the machine body 2 to open it.

[0040] The third cover body 10C has a first outside air intake 41. The first outside air intake 41 is an air supply port for taking outside air into the interior of the body 2. The first outside air intake 41 is covered with a breathable member such as punched metal, expanded metal, or wire mesh.

[0041] The fourth cover body 10D is a cover member which covers the right side of the prime mover 21, and is fixed by bolts or the like to a side cover 10R (see Figure 1) which is erected on the front right side of the driver's seat 6 (to the right of the feet of the operator seated in the driver's seat 6) on the upper part of the body 2.

[0042] 5, the fourth cover body 10D has an exhaust port 42. The exhaust port 42 discharges outside air (cooling air F1) taken into the interior of the body 2 to the outside. Similar to the first outside air intake 41 of the third cover body 10C, the exhaust port 42 is covered with a breathable member such as punched metal, expanded metal, or wire mesh.

[0043] 1 and 3, the fifth cover body 10E is a cover member that covers the left side of the prime mover 21 (the lower area of ​​the left space S2 of the support frame 20), and is fixed by a bracket member 8C (see FIG. 5) erected on the left side of the swivel base plate 8 and by bolts or the like to the lower part of the swivel base plate 8. The battery 26 and the control device 28 are disposed inside (to the right) of the fifth cover body 10E.

[0044] The fifth cover body 10E has a second outside air intake (outside air intake) 43. The second outside air intake 43 is an air supply port for taking outside air into the interior of the fuselage 2. The second outside air intake 43 is configured with a plurality of slits. Note that the second outside air intake 43 is not limited to slits, and may be configured with a plurality of small holes, or may be an opening covered with a breathable member such as punched metal, expanded metal, or wire mesh, similar to the first outside air intake 41 of the third cover body 10C.

[0045] 6, the support frame 20 is erected on the swivel base plate 8. The support frame 20 has a front support portion 20A, a rear support portion 20B, an upper side frame 20C, a front upper frame 20D, a rear upper frame 20E, a front mounting plate 20F, and a rear mounting plate 20G.

[0046] The front support portions 20A extend vertically in front of the motor 21 and are arranged in a pair with a gap in the left-right direction. The rear support portions 20B extend vertically behind the motor 21 and are arranged in a pair with a gap in the left-right direction.

[0047] The upper side frames 20C are formed to extend rearward from the upper portions of the left and right front support pillars 20A. The upper side frames 20C are formed integrally with the front support pillars 20A. The rear portions of the left and right upper side frames 20C are connected and fixed to the upper portions of the rear support pillars 20B disposed behind them.

[0048] The front upper frame 20D is provided between the upper parts of the left and right front support parts 20A and connects these upper parts and the front parts of the left and right upper side frames 20C. The rear upper frame 20E is provided between the upper parts of the left and right rear support parts 20B and connects these upper parts and the rear parts of the left and right upper side frames 20C.

[0049] The front mounting plate 20F is provided across the lower portions of the left and right front support columns 20A and connects the lower portions together. The front mounting plate 20F is fixed by bolts or the like to the upper portion of a partition wall 8A erected on the swivel base plate 8. That is, the front support column 20A is erected on the upper portion of the partition wall 8A. The partition wall 8A is erected in front of the prime mover 21 on the swivel base plate 8 and separates the prime mover chamber S1 from the space S4 in front of the support frame 20.

[0050] The rear mounting plate 20G is fixed by bolts or the like to the upper parts of a pair of left and right bracket members 8B erected on the swivel base plate 8. That is, the rear support portion 20B is erected on the upper parts of the pair of bracket members 8B.

[0051] In this manner, the support frame 20 is a structure having four support pillars 20A, 20B standing on the upper part of the swivel base plate 8, and a plurality of frame parts 20C, 20D, 20E connecting the support pillars 20A, 20B approximately horizontally. Note that the support frame 20 is not limited to the configuration of this embodiment, and can be appropriately changed according to the arrangement, size, etc. of each device mounted on the machine body 2.

[0052] 4, 7, and 8, a partition member 44 is provided on the left rear support portion 20B of the support frame 20. The partition member 44 extends from the upper part to the lower part of the left rear support portion 20B and protrudes leftward from the left rear support portion 20B, separating the left space S2 of the support frame 20 from the rear space S3.

[0053] A seal member 45 is provided on the outer edge of the partition member 44. The seal member 45 contacts along the inner side surface of the outer cover 10 (third cover body 10C). As a result, the partition member 44 and the seal member 45 prevent the outside air (cooling air F1) taken into the inside of the body 2 by the cooling fan 33 from flowing from the left space S2 of the support frame 20 to the rear space S3.

[0054] 5 and 8, a shroud 46 is provided on the left side of the support frame 20. The shroud 46 is an air guide member that guides the outside air (cooling air F1) taken into the interior of the fuselage 2 by the cooling fan 33 so that it flows efficiently from the left space S2 of the support frame 20 to the motor room S1. The shroud 46 is fitted into a space surrounded by the front support column part 20A, the rear support column part 20B, and the upper side frame 20C on the left side of the support frame 20, and separates the left space S2 of the support frame 20 from the motor room S1.

[0055] The shroud 46 has an air blowing opening 46A in the center. The air blowing opening 46A is a substantially circular through-hole, and connects the left space S2 of the support frame 20 with the motor 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.

[0056] As shown in FIG. 5, the radiator 23 has a ventilation surface 23F that the cooling air F1 hits. The radiator 23 is disposed to the left of the cooling fan 33 with the ventilation surface 23F facing the left-right direction, and covers the air blowing opening 46A of the shroud 46 from the left. The oil cooler 24 has a ventilation surface 24F that the cooling air F1 hits. The oil cooler 24 is disposed next to the left of the radiator 23 with the ventilation surface 24F facing the left-right direction. That is, the radiator 23 and the oil cooler 24 are disposed side by side in the left space S2 of the support frame 20 with the ventilation surfaces 23F, 24F facing the left-right direction. The first external air intake 41 provided in the third cover body 10C is provided at a position opposite to the left of the oil cooler 24, i.e., at a position overlapping with the ventilation surfaces 23F, 24F when viewed from the flow direction of the cooling air F1, and connects the space in which the oil cooler 24 and the radiator 23 are arranged to the external space of the third cover body 10C.

[0057] Therefore, when the cooling fan 33 is operated, outside air (cooling air F1) is taken into the left space S2 of the support frame 20 through the first outside air intake 41, passes through the ventilation surface 24F of the oil cooler 24 and the ventilation surface 23F of the radiator 23, is guided to the ventilation opening 46A of the shroud 46, and is sent to the prime mover 21. Specifically, the ventilation surfaces 23F, 24F of the radiator 23 and the oil cooler 24 are provided with tubes through which the fluid to be cooled (cooling liquid, hydraulic oil) flows, and fins attached to the tubes, and the cooling air F1 passes between the tubes and the fins and is guided to the ventilation opening 46A of the shroud 46, and is sent to the prime mover chamber S1. As a result, the cooling air F1 passing through the ventilation surfaces 23F, 24F cools the fluids to be cooled (cooling liquid, hydraulic oil) in the oil cooler 24 and the radiator 23, and the cooling air F1 guided to the motor chamber S1 and passing around the motor 21 cools the motor 21, etc. In other words, the radiator 23 is disposed upstream of the motor 21 in the flow direction of the cooling air F1. In this manner, the left space S2 of the support frame 20 includes a first cool air flow path that runs from the first outside air intake 41 through the arrangement space S5 of the radiator 23 to the motor chamber S1.

[0058] 5, 6 and 8, an intermediate frame 47 and a left mounting plate 48 are provided on the lower left side of the support frame 20. The intermediate frame 47 extends substantially parallel to the rotating base plate 8 below the shroud 46 and between the partition wall 8A and the left bracket member 8B, and divides the space outside (left side) of the motor chamber S1 into upper and lower spaces.

[0059] The intermediate frame 47 supports the radiator 23 from below on the left side of the prime mover 21. The radiator 23 is attached to the upper part of the intermediate frame 47 with bolts or the like. The control device 28 is disposed below the intermediate frame 47, i.e., below the radiator 23 (see Figs. 5 and 8). In more detail, as shown in Figs. 5 and 7, the control device 28 is disposed outside the ventilation surface 23F of the radiator 23 without overlapping with the ventilation surface 23F of the radiator 23 when viewed from the flow direction of the cooling air F1 flowing from the left side of the aircraft body 2 toward the ventilation surface 23F of the radiator 23 (see Fig. 10).

[0060] 5, 6, and 8, the intermediate frame 47 has a communication opening (second communication opening) 47A. The communication opening 47A is a substantially rectangular cutout formed along a side edge of the intermediate frame 47, and connects a space S5 above the intermediate frame 47 in which the radiator 23 is disposed, to a space S6 below the intermediate frame 47 in which the control device 28 is disposed.

[0061] The communication opening 47A is provided above the control device 28. The communication opening 47A is provided at a position facing the control device 28 from above. The communication opening 47A is formed with an opening area in the front-rear direction larger than the dimension of the control device 28 in the front-rear direction. Note that the communication opening 47A is not limited to a notch, and may be a substantially rectangular or circular hole that penetrates the intermediate frame 47 from top to bottom. Alternatively, the intermediate frame 47 may be composed of a pair of plates arranged at a distance from each other in the front-rear direction, and the communication opening 47A may be a spaced portion defined between the plates.

[0062] The left mounting plate 48 is erected on the upper part of the swivel base plate 8 to the left of the prime mover 21. The left mounting plate 48 extends along the lower surface of the intermediate frame 47 between the partition wall 8A and the left bracket member 8B, and supports the intermediate frame 47 from below.

[0063] 6 and 9, an opening 48A is provided in the left mounting plate 48. The opening 48A communicates between the motor chamber S1 and a space S6 in which the control device 28 is disposed (a space below the intermediate frame 47).

[0064] A shielding plate 49 is provided to the left of the left mounting plate 48 (outside the motor chamber S1). The shielding plate 49 is a substantially flat plate-shaped body having a size capable of shielding the entire opening 48A, and is fixed to the left side surface of the left mounting plate 48 (outside the motor chamber S1) with bolts or the like, and covers the opening 48A from the outside of the motor chamber S1. The control device 28 is fixed to the left side surface of the shielding plate 49 (outside the motor chamber S1) with bolts or the like. In this manner, the shielding plate 49 separates the motor chamber S1 in which the motor 21 is disposed from the space S6 in which the control device 28 is disposed, and prevents the cooling air F1 (hot air) after heat exchange cooling the motor 21, the heat retained in the motor chamber S1, and the like from flowing into the space S6 in which the control device 28 is disposed.

[0065] 10, a harness connection part 28A is provided at the front of the control device 28, and the control device 28 is attached to the shielding plate 49 in an inclined position with the connection part 28A facing forward and upward. This configuration improves the ease of connecting the harness compared to a case in which the control device 28 is attached to the shielding plate 49 in an attitude in which the connection part 28A faces horizontally forward.

[0066] 9, a heat insulating member 51 is provided on the right side surface (inside the motor chamber S1) of the shielding plate 49. The heat insulating member 51 covers almost the entire right side surface (inside the motor chamber S1) of the shielding plate 49 and suppresses the transfer of heat of the cooling air F1 after cooling the motor 21 by heat exchange, the heat retained in the motor chamber S1, the radiant heat from the motor 21, and the like to the control device 28.

[0067] The shielding plate 49 has a grommet 52. The grommet 52 is a member for passing a harness connected to the connection portion 28A of the control device 28, and connects the left space S2 of the support frame 20 to the motor chamber S1 through the opening 48A of the left mounting plate 48.

[0068] 8 to 11, a battery bracket 30 is provided to the left of the shielding plate 49 (outside the motor chamber S1). The battery bracket 30 is attached to the shielding plate 49 and the swivel base plate 8, and supports the battery 26 in the space S2 to the left of the support frame 20.

[0069] The battery bracket 30 has a base plate 53, a lower mounting piece 54, a side mounting piece 55, a support 56, and a pressing plate 57. The battery 26 is placed on the upper part of the base plate 53. As shown in Figs. 8 to 10, the base plate 53 has a first flange 58A, a second flange 58B, a third flange 59A, a fourth flange 59B, and a communication port (first communication port) 60. The base plate 53 is formed in a substantially flat plate shape larger than the lower surface of the battery 26, and supports the battery 26 from below. The base plate 53 is disposed substantially parallel to the swivel base plate 8, and a second space S7 described later is defined by the base plate 53 and the swivel base plate 8.

[0070] The first flange 58A stands along the front edge of the base plate 53 and supports the battery 26 from the front. The second flange 58B stands along the rear edge of the base plate 53 and supports the battery 26 from the rear. The third flange 59A and the fourth flange 59B stand along the right edge (the edge on the shielding plate 49 side) of the base plate 53 and support the battery 26 from the right (the shielding plate 49 side).

[0071] The lower mounting piece 54 is provided so as to protrude downward from the lower surface of the base plate 53. The lower end of the lower mounting piece 54 abuts against the upper surface of the swivel base 8 and is fixed by a bolt or the like. In this manner, the lower mounting piece 54 extends from the base plate 53 to the swivel base 8 and supports the base plate 53 above the swivel base 8. As a result, an outside air introduction path S7 is defined between the base plate 53 and the swivel base 8, which introduces outside air (cooling air F1) taken into the inside of the machine body 2 to the arrangement space S6 of the control device 28. That is, the battery 26 is arranged above the swivel base 8 across a predetermined second space (outside air introduction path) S7 through which the cooling air F1 can flow relative to the swivel base 8.

[0072] The side mounting piece 55 is provided on the right side of the first flange 58A and the right side of the second flange 58B, protruding rightward from the right edge of the base plate 53. The right end of the side mounting piece 55 abuts against the left side surface of the shielding plate 49 and is fixed by a bolt or the like. In this manner, the side mounting piece 55 extends from the base plate 53 to the shielding plate 49 (see FIG. 5), and supports the base plate 53 at a distance to the left of the shielding plate 49. As a result, the battery 26 is disposed in a position facing the control device 28 across a predetermined first space S8 through which the cooling air F1 can flow.

[0073] The pillars 56 are erected on the first flange 58A and the second flange 58B. That is, the pillars 56 extend upward from the front and rear of the base plate 53. The pillars 56 on the first flange 58A side have their lower ends bent into a substantially L-shape and are detachably engaged with the first flange 58A. The pillars 56 on the second flange 58B side have their lower ends fixed to the second flange 58B.

[0074] The pressing plate 57 is a plate material that is long in the front-rear direction, and extends between the upper ends of the two front and rear support columns 56. That is, the pressing plate 57 is supported from below by the two front and rear support columns 56. The pressing plate 57 is fixed to the upper ends of the two front and rear support columns 56 with nuts or the like while being in contact with the upper part of the battery 26.

[0075] As shown in Figures 8, 9, and 11, the communication opening 60 is a roughly rectangular notch formed along the right edge (the edge on the shielding plate 49 side) of the base plate 53, and is provided between the third flange 59A and the fourth flange 59B.

[0076] The communication opening 60 is provided to the left of the control device 28, and expands the gap between the base plate 53 and the control device 28 in the left-right direction. The communication opening 60 is formed to have an opening area in the front-rear direction larger than the dimension of the control device 28 in the front-rear direction. In this manner, 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 a notch, and may be a substantially rectangular through-hole or a substantially circular through-hole that penetrates the base plate 53. Also, a plurality of communication openings 60 may be provided in the base plate 53.

[0077] As shown in FIG. 5, the battery bracket 30 is provided between the left mounting plate 48 and the fifth cover body 10E, and supports the battery 26 to the left of the radiator 23. The control device 28 is provided to the right of the battery 26 and below the radiator 23. In this manner, the radiator 23 and the control device 28 are vertically arranged in the left space S2 of the support frame 20. The battery 26 and the control device 28 are horizontally arranged in the left space S2 of the support frame 20. The second outside air intake 43 provided in the fifth cover body 10E is provided below the first outside air intake 41. The second outside air intake 43 is provided at a position facing the left of the outside air introduction path S7 provided below the battery 26, and communicates the outside air introduction path S7 with the external space of the fifth cover body 10E.

[0078] The outside air introduction path S7 communicates with a first space S8 between the battery 26 and the control device 28 on the downstream side of the outside air introduction path S7 in the flow direction of the cooling air F1. The control device 28 is disposed in the left space S2 of the support frame 20 on the downstream side of the outside air introduction path S7.

[0079] Therefore, when the cooling fan 33 is operated, outside air (cooling air F1) is taken into the left space S2 of the support frame 20 through the second outside air intake 43, and is guided through the outside air introduction passage S7 below the battery 26 to the arrangement space S6 of the control device 28. Furthermore, the outside air that has risen in the first space S8 between the battery 26 and the control device 28 is guided through the arrangement space S5 of the radiator 23 to the air blowing opening 46A of the shroud 46 and is sent to the prime mover 21. This cools the battery 26, the control device 28, the radiator 23, the prime mover 21, etc. In other words, the control device 28 is disposed upstream of the flow direction of the cooling air F1 with respect to the prime mover 21. In this way, the left space S2 of the support frame 20 includes a second cool air flow path that runs from the second outside air intake 43 through the arrangement space S6 of the control device 28 to the prime mover room S1.

[0080] In the above embodiment, the radiator (cooler) 23 is arranged to the left of the prime mover 21, but the radiator 23 may be arranged to the right of the prime mover 21, or in front or rear of the prime mover 21, as long as it is located upstream of the flow direction of the cooling air F1 relative to the prime mover 21.

[0081] Further, in the above embodiment, the control device 28 is arranged below the radiator (cooler) 23, but the control device 28 may be arranged above the radiator 23, in front or behind the radiator 23, or to the left or right of the radiator 23, as long as the control device 28 is located upstream of the radiator 23 in the flow direction of the cooling air F1.

[0082] <Effects> Thus, the working machine 1 of the above embodiment comprises a body 2, a prime mover 21 mounted on the body 2, a cooling fan 33 that generates cooling air F1 to cool the prime mover 21, a cooler 23 having a ventilation surface 23F against which the cooling air F1 hits and that cools the cooling liquid that is circulated and supplied to the prime mover 21, and a control device 28, and the cooler 23 and the control device 28 are arranged upstream of the flow direction of the cooling air F1 relative to the prime mover 21, and the control device 28 is arranged in a position that does not overlap with the ventilation surface 23F when viewed from the above flow direction.

[0083] According to this configuration, the cooling air F1 before cooling the prime mover 21 is guided to the ventilation surface 23F of the cooler 23 without being obstructed by the control device 28, so that both the cooler 23 and the control device 28 can be cooled efficiently.

[0084] In addition, the control device 28 is disposed below the cooler 23.

[0085] According to this configuration, even if the cooling fan 33 is stopped, the heat released from the cooler 23 is unlikely to flow into the space S6 in which the control device 28 is disposed, so that the cooling efficiency of the control device 28 is further improved.

[0086] Furthermore, the working machine 1 of the above embodiment is provided with a shielding plate 49 that separates the engine room S1 in which the engine 21 is arranged from the space S6 in which the control device 28 is arranged, and the control device 28 is arranged in a position facing the surface of the shielding plate 49 opposite the engine room S1 side.

[0087] According to this configuration, the cooling air F1 after heat exchange cooling of the prime mover 21, the retained heat in the prime mover chamber S1, the radiant heat from the prime mover 21, etc. can be prevented from flowing into the space S6 in which the control device 28 is arranged, thereby further improving the cooling efficiency of the control device 28.

[0088] Furthermore, the work machine 1 of the above embodiment is provided with a heat insulating member 51 that covers the surface of the shielding plate 49 on the motor chamber S1 side.

[0089] According to this configuration, the heat of the cooling air F1 after cooling the prime mover 21 by heat exchange, the heat retained in the prime mover chamber S1, the radiant heat from the prime mover 21, etc. can be more effectively prevented from being transmitted to the control device 28, thereby further improving the cooling efficiency of the control device 28.

[0090] Furthermore, the work machine 1 of the above embodiment is equipped with a battery 26 that supplies power to electrical equipment including a control device 28 mounted on the work machine 1, and the battery 26 is positioned opposite the control device 28 across the first space S8 through which cooling air F1 can flow.

[0091] According to this configuration, by circulating the cooling air F1 through the first space S8 between the battery 26 and the control device 28, the cooling air F1 can be reliably brought into contact with the control device 28, thereby further improving the cooling efficiency of the control device 28. This makes it possible to further reduce the thermal load on the control device 28.

[0092] In addition, the battery 26 is arranged above the bottom substrate 8 of the body 2, separated by a second space S7 through which cooling air F1 can flow relative to the bottom substrate 8, and the second space S7 is connected to the first space S8 downstream in the flow direction of the cooling air F1 in the second space S7.

[0093] According to this configuration, the cooling air F1 can be reliably guided to the first space S8 through the second space S7 between the bottom substrate 8 and the battery 26, thereby further improving the cooling efficiency of the control device 28. This further reduces the thermal load of the control device 28.

[0094] In addition, the cover body 10 which forms the outer shell of the body 2 is provided with a first outside air intake 41 provided at a position overlapping with the ventilation surface portion 23F when viewed from the above-mentioned flow direction, and a second outside air intake 43 provided below the first outside air intake 41 and connecting the second space S7 with the external space of the cover body 10.

[0095] According to this configuration, the cooling air F1 can be reliably guided from the second outside air intake 43 through the second space S7 to the first space S8, further improving the cooling efficiency of the control device 28. This can further reduce the thermal load of the control device 28.

[0096] Furthermore, the work machine 1 of the above embodiment is provided with a battery bracket 30 attached to the bottom base plate 8 and supporting the battery 26, and the battery bracket 30 has a base plate 53 that supports the battery 26 from below, and the second space S7 is defined by the base plate 53 and the bottom base plate 8.

[0097] According to this configuration, the outside air (cooling air F1) taken into the inside of the 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 substrate 8, and is led to the first space S8 between the battery 26 and the control device 28, further improving the cooling efficiency of the control device 28. This further reduces the thermal load on the control device 28.

[0098] The base plate 53 also has a first communication port 60 through which the cooling air F1 flows from the second space S7 to the first space S8.

[0099] According to this configuration, the cooling air F1 can be reliably guided from the second space S7 to the first space S8 through the first communication port 60 provided in the base plate 53 of the battery bracket 30, further improving the cooling efficiency of the control device 28. This further reduces the thermal load of the control device 28.

[0100] Furthermore, the work machine 1 of the above embodiment is provided with an intermediate frame 47 that supports the cooler 23 from below, and the intermediate frame 47 has a second communication port 47A that allows cooling air F1 to circulate from the first space S8 to the space S5 in which the cooler 23 is arranged.

[0101] According to this configuration, by circulating the cooling air F1 from the first space S8 through the second communication port 47A provided in the intermediate frame 47 to the space S5 in which the cooler 23 is arranged, the flow of the cooling air F1 in the first space S8 is stabilized, and the cooling efficiency of the control device 28 is further improved. This makes it possible to further reduce the thermal load of the control device 28.

[0102] The second communication port 47A is provided above the control device .

[0103] According to this configuration, the cooling air F1 that passes through the first space S8 and flows into the space S5 in which the cooler 23 is arranged can be reliably brought into contact with the control device 28, thereby further improving the cooling efficiency of the control device 28. This makes it possible to further reduce the thermal load of the control device 28.

[0104] Although the present invention has been described above, the embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present invention is indicated by the claims, not by the above description, and is intended to include all modifications within the meaning and scope of the claims.

[0105] In addition, in the above-described embodiment, an example was described in which the present invention is applied to a work machine such as a backhoe, but the application of the present invention is not limited to this, and the present invention may be applied to other construction machines such as a wheel loader, a compact track loader, and a skid steer loader, and may be applied to agricultural machines such as a tractor, a combine harvester, a rice transplanter, and a lawn mower. [Explanation of symbols]

[0106] 1 Work equipment 2. Aircraft 3 Running gear 4 Work equipment 6 Driver's seat 8 Swivel base plate (bottom base plate) 10 Outer cover (cover body) 20 Support frame 21 Prime Mover 23 Radiator (cooler) 26 Battery 28 Control device 30 Battery bracket 33 Cooling fan 43 Second outside air intake (outside air intake) 47 Intermediate Frame 47A Communication port (2nd communication port) 48 Left mounting plate 49 Shield plate 51 Insulation materials 60 Communication port (1st communication port) F1 cooling air S1 Engine Room S6 Control unit layout space S7 Outside air intake (second space) S8 1st space

Claims

1. The aircraft and A prime mover mounted on the airframe; a cooling fan that generates cooling air for cooling the engine; a cooler having a ventilation surface portion to which the cooling air hits and configured to cool a cooling liquid circulated and supplied to the motor; A control device, the cooler and the control device are disposed upstream of the motor in a flow direction of the cooling air, The control device is disposed in a position that does not overlap with the ventilation surface portion when viewed from the flow direction.

2. The work machine according to claim 1 , wherein the control device is disposed below the cooler.

3. a partition plate separating a motor room in which the motor is disposed and a space in which the control device is disposed, 3. The work machine according to claim 2, wherein the control device is disposed at a position facing a surface of the shielding plate opposite to the engine compartment side.

4. The work machine according to claim 3, further comprising a heat insulating member covering a surface of the shielding plate facing the engine compartment.

5. a battery for supplying power to electrical equipment including the control device mounted on the work machine; 5. The work machine according to claim 3, wherein the battery is disposed at a position facing the control device across a first space through which the cooling air can flow.

6. the battery is disposed above the bottom board of the aircraft body, separated from the bottom board by a second space through which cooling air can flow; The work machine according to claim 5 , wherein the second space is in communication with the first space on a downstream side of the second space in a flow direction of the cooling air.

7. The work machine described in claim 6, wherein a cover body constituting the outer shell of the machine body is provided with a first outside air intake provided at a position overlapping with the ventilation surface portion when viewed from the flow direction, and a second outside air intake provided below the first outside air intake and connecting the second space with the external space of the cover body.

8. a battery bracket attached to the bottom substrate to support the battery; the battery bracket has a base plate that supports the battery from below, The work machine according to claim 6 , wherein the second space is defined by the base plate and the bottom base plate.

9. The work machine according to claim 8 , wherein the base plate has a first communication port through which the cooling air flows from the second space to the first space.

10. An intermediate frame is provided to support the cooler from below, The work machine according to claim 5 , wherein the intermediate frame has a second communication port through which the cooling air flows from the first space to a space in which the cooler is disposed.

11. The work machine according to claim 10, wherein the second communication port is provided above the control device.

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