Electrically driven work vehicle

Abstract

To provide an electrically driven work vehicle capable of reducing power consumption of a battery unit.SOLUTION: In a wheel loader 100 operated using a storage battery unit 12 as a power source, the storage battery unit 12 is placed at the rear end of a rear frame 2. A motor 13, a hydraulic actuator 32 and others which are main devices to be cooled are arranged near a cab 9. Among a circulation pump 19, a heat exchanger 21, a blower 22, and others which constitute a cooler, the circulation pump 19 and the storage battery unit 12 are arranged vertically in the cross direction of the rear frame 2, and the heat exchanger 21 and the blower 22 are arranged in attitude where the suction surface and the discharge surface of the blower 22 intersect a straight line in the horizontal direction of the rear frame 2.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an electrically driven work vehicle that uses a battery unit such as a storage battery as a power source. [Background technology]

[0002] A wheel loader, one example of a work vehicle, has a body structure separated into a front and rear section. The driver's cab is located in front of the rear section, and the engine, which is the power source for the powertrain, is often mounted behind the cab.

[0003] For example, Patent Document 1 discloses a wheel loader in which a front frame constituting the front section and a rear frame constituting the rear section are connected to be rotatable in the left-right direction, a loading device composed of a bucket and link mechanism etc. is provided on the front frame, and hydraulic actuators such as hydraulic pumps and the power train including a torque converter, transmission, propeller shaft, axles etc. are arranged near the driver's cab on the rear frame. In addition, since heat is generated as mechanical loss from the engine and hydraulic actuators etc., a cooling device is mounted on the rear section that combines a heat exchanger such as a radiator or oil cooler with a blower (cooling fan) that supplies air to the heat exchanger, and these heat exchangers and blowers are arranged at the very rear of the rear frame. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2013-209940 A Summary of the Invention [Problem to be solved by the invention]

[0005] As described above, in the case of a wheel loader equipped with an engine as a power source, the heat exchanger and the blower are mounted at the rear end of the vehicle body. On the other hand, from the viewpoint of contributing to the SDGs goals, there is a demand for an electrically driven wheel loader that is powered by a storage battery that does not emit CO2. In that case, if a motor is mounted as a driving source for the powertrain and the motor is controlled by an inverter, it becomes possible to operate as a work vehicle in the same way as an engine-driven wheel loader. Since the motor is connected to a transmission, a hydraulic pump, etc., it is preferable that the motor is disposed in the center of the vehicle body where they are mounted, and the inverter that controls the motor is also disposed near the center of the vehicle body near the motor. In addition, since the motor, hydraulic actuator, etc. generate heat as mechanical loss, it is necessary to mount a cooling device that recovers this heat, and it is considered that the heat exchanger and the blower are mounted at the rear end of the vehicle body, as in the case of an engine-driven type.

[0006] However, in an electrically driven work vehicle, if the heat exchanger and blower, which are components of the cooling system, are located at the rear end of the vehicle body, the devices to be cooled, such as the motor and hydraulic actuators, are mainly located in the center of the vehicle body, so the distance from these devices to the cooling system becomes long, and the piping for the cooling medium connecting the heat exchanger and the devices to be cooled becomes long accordingly. As a result, there are problems such as complicated piping arrangement and increased pressure loss due to piping resistance, which increases the power consumption of the storage battery.

[0007] SUMMARY OF THE PRESENT DISCLOSURE An object of the present invention is to provide an electrically driven work vehicle that is capable of reducing the amount of power consumption of the battery unit. [Means for solving the problem]

[0008] In order to achieve the above-mentioned object, the present invention provides an electrically driven work vehicle comprising a vehicle body having a front frame and a rear frame, a driver's cab provided in a front portion of the rear frame, a battery unit mounted on the rear frame, a motor that operates using the battery unit as a power source, and a cooling device that cools heat generated by the motor, the cooling device having a circulation pump that supplies a cooling medium to the motor, a heat exchanger that exhausts heat recovered by the cooling medium, and a blower that supplies air to the heat exchanger, wherein the battery unit is mounted on the rear end portion of the rear frame, the motor is disposed on the side of the driver's cab of the rear frame, the circulation pump and the battery unit are arranged vertically along the fore-and-aft direction of the rear frame, and the heat exchanger and the blower are arranged in a position where the intake surface and exhaust surface of the blower intersect with the left-right direction of the rear frame. Effect of the Invention

[0009] According to the present invention, it is possible to reduce the power consumption of a battery unit. Problems, configurations and effects other than those described above will become apparent from the following description of the embodiments. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a side view of a wheel loader according to a first embodiment of the present invention. [Diagram 2] FIG. 1 is a plan view of a wheel loader according to a first embodiment. [Diagram 3] FIG. 2 is a cross-sectional view taken along line III-III in FIG. [Figure 4] FIG. 2 is a diagram showing an arrangement of a plurality of electrically-driven devices provided in the cooling device. [Diagram 5] FIG. 2 is a block diagram showing a schematic configuration of an electric power system. [Figure 6] FIG. 2 is a block diagram showing a schematic configuration of an electric equipment cooling circuit. [Figure 7] 1 is a block diagram showing a schematic configuration of a hydraulic equipment cooling circuit; [Figure 8]1 is a block diagram showing a schematic configuration of an air conditioner cooling circuit. [Figure 9] FIG. 2 is a block diagram showing a schematic configuration of a cooling circuit for a storage battery unit. [Figure 10] FIG. 5 is a side view of a wheel loader according to a second embodiment of the present invention. [Figure 11] FIG. 11 is a plan view of the wheel loader according to the second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, as one aspect of the work vehicle according to the first embodiment of the present invention, a wheel loader that performs loading and unloading work to excavate earth, sand, minerals, etc. and load them into a loading destination such as a dump truck or a hopper will be described.

[0012] First, the configuration of a wheel loader 100 will be described with reference to Figs. 1 to 3.

[0013] FIG. 1 is a side view of a wheel loader 100 according to a first embodiment of the present invention, FIG. 2 is a plan view of the wheel loader 100 according to the first embodiment, and FIG. 3 is a cross-sectional view taken along line III-III in FIG.

[0014] The wheel loader 100 is an articulated work vehicle that is steered by bending the vehicle body near the center, and a front frame 1 that constitutes the front part of the vehicle body and a rear frame 2 that constitutes the rear part of the vehicle body are connected so as to be rotatable in the left and right direction by a center joint 3. The front frame 1 bends in the left and right direction relative to the rear frame 2 by steering operation.

[0015] The vehicle body is provided with four wheels 4, two of which are front wheels 4A provided on both the left and right sides of the front frame 1, and the remaining two wheels 4 are rear wheels 4B provided on both the left and right sides of the rear frame 2. In the left-right direction of the vehicle body, the right hand side of an operator seated in the driver's seat facing forward is defined as the right side of the vehicle body, and the left hand side of the operator is defined as the left side of the vehicle body.

[0016] A hydraulically driven working device 5 is attached to the front of the front frame 1. The working device 5 has a lift arm 6 attached to the front frame 1 so as to be rotatable in the vertical direction, two lift arm cylinders (not shown) that drive the lift arm 6, a bucket 7 attached to the tip of the lift arm 6 so as to be rotatable in the vertical direction, a bucket cylinder 7A that drives the bucket 7, and a bell crank 8 that is rotatably connected to the lift arm 6 and constitutes a link mechanism between the bucket 7 and the bucket cylinder 7A.

[0017] The rear frame 2 is provided with a cab 9 for an operator to sit in, a machine room 10 that houses various devices required for driving the wheel loader 100, and a counterweight 11 for maintaining balance with the working implement 5 so that the vehicle body does not tilt. In the rear frame 2, the cab 9 is located at the front, the counterweight 11 at the rearmost end, and the machine room 10 between the cab 9 and the counterweight 11. In addition, a rectangular parallelepiped storage battery unit 12 is mounted on the rear end of the rear frame 2, and the wheel loader 100 is an electrically driven work vehicle that operates using the storage battery unit 12 as a power source.

[0018] The cab 9 is located at approximately the upper center of the vehicle body, and is installed in front of the rear frame 2. A motor 13, a transmission 14, a hydraulic pump 15, a propeller shaft 16, a compressor 17, and the like are disposed below the cab 9. In addition, a hydraulic oil tank 18, and components of a cooling system, such as a circulation pump 19, a compressor 20, a heat exchanger 21, and a blower 22, are mounted behind the cab 9, and in addition, an inverter 23, a DCDC converter 24, and a charging device 25 are also installed. Each of these devices is housed in the machinery room 10 together with the storage battery unit 12, and is covered by the cover of the machinery room 10.

[0019] The traveling power train is composed of an inverter 23, a motor 13, a transmission 14, a propeller shaft 16, front and rear axles (a front axle 26 and a rear axle 27), and four wheels 4 (front wheels 4A and rear wheels 4B). The vehicle is also equipped with a hydraulic cylinder for bending the vehicle body in an articulated manner and a hydraulic cylinder for a hydraulically driven working device 5, and as a hydraulic power train for extending and retracting these hydraulic cylinders, a hydraulic device is mounted that drives a hydraulic pump 15 with the inverter 23 and the motor 13 and is composed of a valve (not shown), a hydraulic oil tank 18, etc. One of the two motors 13 shown in FIG. 2 is for traveling and the other is for hydraulics. These two motors 13 and the hydraulic pump 15 are connected to the transmission 14 and are disposed below the machine room 10 and approximately in the center of the vehicle body.

[0020] The rear frame 2 is mounted with a cooling device that cools down the heat generated by the motor 13 and inverter 23, which are components of the driving powertrain, the motor 13, hydraulic pump 15 and inverter 23, which are components of the hydraulic powertrain, and the storage battery unit 12, which is the power source.In addition, the driver's cab 9 is equipped with an air conditioner operated by the cooling device.

[0021] 4 is a diagram showing the arrangement of a plurality of electrically-driven devices provided in the cooling device. As shown in FIG. 4, among the devices arranged behind the cab 9, the electrically-driven devices of the circulation pump 19, the compressor 20, the inverter 23, the DCDC converter 24, and the charging device 25 are arranged in a vertically stacked state on an appropriate support member attached to the rear frame 2. For example, a rack-shaped subframe 28 is attached as a support member behind the cab 9, and the charging device 25, the DCDC converter 24, and the inverter 23 are assembled in this subframe 28 in order from the bottom, and the circulation pump 19 and the compressor 20 are mounted on the top stage. However, the arrangement of these electrically-driven devices is only an example, and the arrangement order of the electrically-driven devices is not limited to the form shown in FIG. 4, for example, the arrangement order of the inverter 23 and the DCDC converter 24 may be reversed. In addition, the heat exchanger 21 is either a radiator, an oil cooler, or a condenser, and such a heat exchanger 21 is combined with a blower 22 to form a set, and these sets of heat exchanger 21 and blower 22 are arranged on both the left and right sides of the electric equipment including the circulation pump 19 and the compressor 20, respectively.

[0022] By mounting the storage battery unit 12 on the rear end of the rear frame 2, a mounting space for components is secured between the cab 9 and the storage battery unit 12. By arranging electric equipment including the circulation pump 19 and the compressor 20 in this mounting space, the circulation pump 19 and the storage battery unit 12 are vertically arranged along a straight line along the front-to-rear direction of the rear frame 2. Meanwhile, two pairs of heat exchanger 21 and blower 22 are arranged, one on each side of the electric equipment including the circulation pump 19 and the compressor 20, and are arranged in parallel with the intake surface and exhaust surface of each blower 22 perpendicular (intersecting) to a straight line along the left-to-right direction of the rear frame 2.

[0023] Here, the blower 22 is disposed on the vehicle body inner side of the heat exchanger 21, and of the intake and exhaust surfaces of the blower 22, the intake surface side faces the circulation pump 19, and the exhaust surface side faces the heat exchanger 21. As a result, the heat exchanger 21 is disposed so as to exhaust heat from the inside to the outside in the left-right direction of the vehicle body. To exhaust heat from the heat exchanger 21 to the outside air, an opening (not shown) may be provided in the cover of the machine room 10, and the heat exchanger 21 and the exhaust port are preferably positioned above the rear wheels 4B.

[0024] In this way, the exhaust heat from the heat exchanger 21 is exhausted from the inside to the outside in the left-right direction of the vehicle body, but since the driver's cab 9 and hydraulic oil tank 18 are located in front of the heat exchanger 21 and the battery unit 12 is located behind the heat exchanger 21, outside air is taken in from at least one side, above or below the heat exchanger 21. In this case, intake from the upper side can be achieved by taking in outside air through an opening (not shown) provided in the cover of the machine room 10, and intake from the lower side can be achieved by taking in outside air through gaps between each device. And since each electric device, including the circulation pump 19 and compressor 20, is mounted in the space where the outside air circulates in this way, the exhaust heat from the outer surfaces of these electric devices can be dissipated to the outside air.

[0025] Fig. 5 is a block diagram showing a schematic configuration of an electric system mounted on a wheel loader 100. As shown in Fig. 5, the wheel loader 100 is equipped with a storage battery unit 12 and a charging device 25, and an external power source is connected to the charging device 25 to charge the storage battery unit 12 with electricity. The electricity charged in the storage battery unit 12 is then used to drive the wheels 4 of the traveling power train and the hydraulic pump 15 of the hydraulic power train via the inverter 23 and the motor 13, or to drive the motor 13 for the compressor 20. In addition, the voltage is stepped down by a DCDC converter 24 to drive the motor 13 for the circulation pump 19 or the motor 13 for the blower 22 and the control device 29.

[0026] Fig. 6 is a block diagram showing a schematic configuration of an electric equipment cooling circuit mounted on a wheel loader 100. As shown in Fig. 6, a circulation pump 19 distributes cooling water (cooling medium) to an inverter 23 and a motor 13, or to a DCDC converter 24 and a charging device 25, via cooling water piping, and the heat of the cooling water is discharged by a radiator 30, which is a heat exchanger, and circulated. In this case, the storage battery unit 12 is mounted on the rear end of the rear frame 2, and the storage battery unit 12 and the circulation pump 19 are vertically arranged along a straight line along the front-rear direction of the rear frame 2, and the radiator (heat exchanger) 30 and the blower 22 are arranged in parallel in an orientation perpendicular (intersecting) to a straight line along the left-right direction of the rear frame 2. Therefore, the length of the cooling water piping connecting the motor 13, which is an object to be cooled and arranged near the cab 9 (the cab 9 side of the rear frame 1B), and the radiator 30, and the length of the cooling water piping connecting the radiator 30 and the circulation pump 19 can be shortened.

[0027] Fig. 7 is a block diagram showing a schematic configuration of a hydraulic equipment cooling circuit mounted on a wheel loader 100. As shown in Fig. 7, hydraulic oil from a hydraulic oil tank 18 is distributed to a valve 31 by a hydraulic pump 15 to drive a hydraulic actuator (hydraulic cylinder) 32, and heat of the oil returning from the valve 31 is discharged by an oil cooler 33, which is a heat exchanger, via a hydraulic oil piping and circulated. In this case, the valve 31 to be cooled is disposed near (below) the cab 9, and the oil cooler 33, which is a heat exchanger, is disposed in the mounting space further forward in the vehicle body than the storage battery unit 12, so that the length of the hydraulic oil piping connecting the valve 31 and the oil cooler 33 and the length of the hydraulic oil piping connecting the oil cooler 33 and the hydraulic oil tank 18 can each be shortened.

[0028] Fig. 8 is a block diagram showing a schematic configuration of an air conditioner cooling circuit mounted on a wheel loader 100. As shown in Fig. 8, refrigerant gas compressed by the compressor 20 is discharged by the condenser 34, which is a heat exchanger, and the liquid refrigerant that has become high temperature and high pressure in the condenser 34 is decompressed by the expansion valve 35 through a refrigerant pipe, and the evaporator 36 recovers heat from the blown air and circulates it. In this case, the expansion valve 35 and the evaporator 36 are disposed in the cab 9, the storage battery unit 12 and the compressor 20 are vertically arranged along a straight line along the front-rear direction of the rear frame 2, and the condenser (heat exchanger) 34 and the blower 22 are disposed in parallel in an orientation perpendicular (intersecting) to a straight line along the left-right direction of the rear frame, so that the length of the refrigerant pipe connecting the condenser 34 and the expansion valve 35 and the length of the refrigerant pipe connecting the compressor 20 and the condenser 34 can be shortened.

[0029] FIG. 9 is a block diagram showing a schematic configuration of a cooling circuit for a battery unit mounted on a wheel loader 100. As shown in FIG. 9, the refrigerant gas compressed by the compressor 20 is discharged by the condenser 34, which is a heat exchanger, and the liquid refrigerant that has become high temperature and high pressure in the condenser 34 is decompressed by the expansion valve 35 through a refrigerant pipe, and the evaporator 36 recovers heat from the blown air and circulates it. Then, the circulation pump 19 distributes cooling water (cooling medium) through a cooling water pipe to the battery unit 12 to be cooled, and the evaporator 36 recovers heat from the high-temperature cooling water and circulates it. In this case, the expansion valve 35 and the evaporator 36 are disposed in the cab 9, the battery unit 12 and the circulation pump 19 are vertically arranged along a straight line along the front-rear direction of the rear frame 2, and the condenser (heat exchanger) 34 and the blower 22 are disposed in parallel in a position perpendicular (intersecting) to a straight line along the left-right direction of the rear frame, so that the length of the refrigerant pipe connecting the compressor 20 and the condenser 34 can be shortened.

[0030] Because the piping length of the cooling device can be shortened in this way, pressure loss of the circulating water and refrigerant decreases, and power consumption of electrically powered equipment such as the circulation pump 19 and compressor 20 is reduced. This reduces power consumption of the storage battery unit 12 by the circulation pump 19 etc., making it possible to ensure the operating time of the wheel loader 100. Furthermore, because the piping length of the cooling device is shortened, the layout of the piping can be simplified.

[0031] As described above, in the wheel loader 100 according to the first embodiment, the storage battery unit 12 as a power source is mounted on the rear end of the rear frame 2, thereby ensuring mounting space between the cab 9 and the storage battery unit 12, and the main equipment to be cooled, such as the motor 13 and hydraulic actuator 32, are arranged in the vicinity of the cab 9, and of the components of the cooling device, such as the circulation pump 19, heat exchanger 21 and blower 22, the circulation pump 19 and storage battery unit 12 are arranged vertically along a straight line along the fore-and-aft direction of the rear frame 2, and the heat exchanger 21 and blower 22 are arranged in a position such that the intake surface and exhaust surface of the blower 22 are perpendicular (intersect) to a straight line along the left-right direction of the rear frame 2.

[0032] With this configuration, the piping length of the cooling device arranged in the mounting space can be shortened, which reduces pressure loss of the circulating water and refrigerant and reduces power consumption of the circulation pump 19, compressor 20, etc. This reduces power consumption of the storage battery unit 12 by the circulation pump 19, etc., making it possible to ensure the operating time of the wheel loader 100. Also, because the piping length of the cooling device is shortened, the routing of the piping can be simplified. Furthermore, by mounting the storage battery unit 12 on the rear end of the rear frame 2, the capacity of the counterweight 11 required to maintain balance with the working device 5 can be reduced.

[0033] Furthermore, in the wheel loader 100 according to the first embodiment, the heat exchanger 21 is combined with the blower 22 to form a pair, and these pairs of the heat exchanger 21 and the blower 22 are arranged on both the left and right sides of the electric equipment such as the circulation pump 19 and the compressor 20, so that the intake of the heat exchanger 21 takes in outside air from at least one side in the vertical direction of the vehicle body. By mounting electric equipment such as the circulation pump 19 in a space where outside air circulates in this way, the exhaust heat from the outer surfaces of these electric equipment is efficiently dissipated to the outside air, and an efficient cooling effect can be achieved. Furthermore, the accumulation of dust on each electric equipment is suppressed, reducing the resulting deterioration over time and malfunctions.

[0034] Furthermore, in the wheel loader 100 according to the first embodiment, a plurality of electrically-driven devices, such as the circulation pump 19, compressor 20, inverter 23, DCDC converter 24, which are components of the cooling system, are mounted in a vertically stacked state on a support member such as the subframe 28 attached to the rear frame 2. This makes it possible to concentrate these electrically-driven devices in the mounting space between the cab 9 and the battery unit 12, improving the ease of assembly and maintenance of the vehicle.

[0035] Next, the configuration of a wheel loader 200 according to a second embodiment of the present invention will be described with reference to FIGS.

[0036] FIG. 10 is a side view of a wheel loader 200 according to a second embodiment of the present invention, and FIG. 11 is a plan view of the wheel loader 200 according to the second embodiment, and parts corresponding to those in FIGS. 1 and 2 are given the same reference numerals and duplicated explanations will be omitted.

[0037] As shown in Figures 10 and 11, the wheel loader 200 according to the second embodiment has a pair of a heat exchanger 21 and a blower 22 arranged on both the left and right sides of the storage battery unit 12 mounted on the rear end of the rear frame 2, and other than that the configuration is basically the same as the wheel loader 100 according to the first embodiment.

[0038] In the wheel loader 200 according to the second embodiment configured in this manner, too, by mounting the storage battery unit 12 to the rear end of the rear frame 2, mounting space is secured between the cab 9 and the storage battery unit 12, and in this mounting space, electric devices such as the circulation pump 19 and compressor 20 of the cooling system are arranged vertically in a straight line along the fore-and-aft direction of the rear frame 2, with the heat exchanger 21 and the blower 22 arranged in parallel on both the left and right sides of the storage battery unit 12, so that the length of the piping for the cooling system can be shortened, the power consumption of the storage battery unit 12 can be reduced, and the layout of the piping can be simplified.

[0039] The embodiments of the present invention have been described above. Note that the present invention is not limited to the above-described embodiments, and various modified examples are included. For example, the above-described embodiments have been described in detail to clearly explain the present invention, and are not necessarily limited to those having all of the configurations described. In addition, it is possible to replace a part of the configuration of this embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of this embodiment. Furthermore, it is possible to add, delete, or replace a part of the configuration of this embodiment with another configuration.

[0040] For example, in the above first and second embodiments, a wheel loader has been given as an example of one type of work vehicle, but the present invention is not limited to this and may be any electrically driven work vehicle equipped with a battery unit as a power source.

[0041] In addition, in the above first and second embodiments, a storage battery unit has been described as an example of a power source, but this is not limited to this, and a fuel cell may be used instead of the storage battery, or both a storage battery and a fuel cell may be used.

[0042] In addition, in the above first and second embodiments, a pair of heat exchanger 21 and blower 22 is arranged on both sides of the rear frame 2 in the left-right direction, respectively, but this is not limited to this, and a pair of heat exchanger 21 and blower 22 may be arranged on either the left or right side of the rear frame 2. [Explanation of symbols]

[0043] 1: Previous frame 2: Rear frame 3: Center joint 4: Wheels 5: Working equipment 9: Driver's cab 10: Machine room 11: Counterweight 12: Storage battery unit (battery unit) 13:Motor 14: Transmission 15: Hydraulic pump 16: Propeller shaft 17: Compressor 18: Hydraulic oil tank 19: Circulation pump 20: Compressor 21:Heat exchanger 22: Blower 23: Inverter 24: DCDC converter 25: Charging device 28: Subframe 30: Radiator (heat exchanger) 31: Valve 32: Hydraulic actuator 33: Oil cooler (heat exchanger) 34: Condenser (heat exchanger) 35: Expansion valve 36: Evaporator 100,200: Wheel loader (electrically driven work vehicle)

Claims

1. a vehicle body having a front frame and a rear frame; A cab provided at a front portion of the rear frame; A battery unit mounted on the rear frame; a motor that operates using the battery unit as a power source; a cooling device that cools heat generated by the motor; Equipped with The cooling device includes: a circulating pump for supplying a cooling medium to the motor; a heat exchanger that dissipates heat recovered by the cooling medium; A blower for supplying air to the heat exchanger; In an electrically driven work vehicle having The battery unit is mounted on a rear end portion of the rear frame, The motor is disposed on a side of the rear frame facing the cab, the circulation pump and the battery unit are arranged vertically along a front-rear direction of the rear frame, The heat exchanger and the blower are disposed in such a manner that an intake surface and an exhaust surface of the blower intersect with the left-right direction of the rear frame. An electrically driven work vehicle.

2. The electrically driven work vehicle according to claim 1, The heat exchanger and the blower are disposed on both the left and right sides of the circulation pump. An electrically driven work vehicle.

3. The electrically driven work vehicle according to claim 2, The blower is The intake surface side faces the circulation pump, and the exhaust surface side faces the heat exchanger, Air taken in from at least one of the upper and lower directions of the rear frame is supplied to the heat exchanger. An electrically driven work vehicle.

4. The electrically driven work vehicle according to claim 1, The heat exchanger and the blower are disposed on both the left and right sides of the battery unit. An electrically driven work vehicle.

5. The electrically driven work vehicle according to claim 1, The cooling device includes: In addition to the circulation pump, the system includes a plurality of electrically-driven devices having different functions, The plurality of electrically-driven devices include The devices are arranged in a vertically stacked state behind the driver's cab. An electrically driven work vehicle.

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