electric tractor

Abstract

To provide an electrically-driven tractor, which has a structure strong enough to support a battery.SOLUTION: An electrically-driven tractor 1 is equipped with a battery 15, a transmission device 21, a body frame 30, a rear axle device 52, and a front axle device 51. The transmission device 21 changes speed of input power and outputs the power. The body frame 30 is fixed to the transmission device 21. The rear axle device 52 supports a rear wheel 8 and transmits power outputted from the transmission device 21 to the rear wheel 8. The front axle device 51 supports a front wheel 7. The rear axle device 52 and the front axle device 51 support a chassis 20 constituted to include the body frame 30 and the transmission device. The battery 15 is supported on the chassis 20.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a configuration for supporting various devices in an electric tractor. [Background technology]

[0002] Patent Document 1 discloses a tractor as an electric work vehicle. This tractor is configured with a battery and a motor instead of an engine. The battery is housed in a sealed state by a battery cover. The outer wall surface of the battery cover forms part of the exterior of the tractor. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-000957 Summary of the Invention [Problem to be solved by the invention]

[0004] The structure of the above-mentioned Patent Document 1 does not disclose a specific structure for supporting various devices of the electric tractor, and therefore there is room for improvement in terms of efficient use of space, etc.

[0005] The present invention has been made in view of the above circumstances, and one of its objects is to realize a strong structure for supporting a battery in an electric tractor.

[0006] The problem to be solved by the present invention is as described above. Next, the means for solving this problem and the effects thereof will be explained.

[0007] According to an aspect of the present invention, there is provided an electric tractor having the following configuration: That is, this electric tractor includes a battery, a transmission device, a machine frame, a rear axle device, a front axle device, The bonnet andThe transmission device changes the speed of input power and outputs it. The vehicle frame is fixed to the transmission device. The rear axle device supports rear wheels and transmits power output from the transmission device to the rear wheels. The front axle device supports front wheels. The rear axle device and the front axle device support a chassis configured to include the vehicle frame and the transmission device. The battery is supported by the chassis. The electric tractor includes a plate-shaped base member and a vibration-isolating member. The vibration-isolating member supports the base member on the vehicle frame in a vibration-isolating manner. The battery is fixed to the base member. The electric tractor includes an on-board charging device and a cooling device. The on-board charging device controls charging of the battery. The cooling device cools the battery. The battery, the on-board charging device, and the cooling device are disposed in the interior space of the hood. When the base member is separated from the vehicle frame, the on-board charging device and the cooling device are arranged on the base member side in addition to the battery.

[0008] This makes it possible to realize a strong support structure for supporting the weight of the battery and other components in the electric tractor. The battery support structure can be realized with a simple configuration using a plate-shaped base member. The battery, on-board charging device, and cooling device can be unitized based on the base member, and the unit can be mounted on the vehicle body. This makes it easy to handle during manufacturing of the tractor.

[0013] In the electric tractor, the battery is preferably located above the axle of the front wheels.

[0014] This makes it possible to easily ensure the minimum ground clearance of the electric tractor.

[0015] In the electric tractor, it is preferable that an on-board charging device that controls charging of the battery is disposed above the battery.

[0016] This allows for a compact arrangement including the battery and on-board charging device.

[0017] In the electric tractor, The following configuration It is preferable toIn other words, this electric tractor is machine A traction motor, which is an electric motor that generates power to propel the body. Equipped with The transmission device is disposed rearward of the vehicle body relative to the battery in a plan view. The vehicle frame includes left and right paired frame members. The traction motor is disposed rearward of the battery and forward of the transmission device in a plan view, and is disposed between the left and right frame members.

[0018] This allows the electric tractor to have a strong support structure that can support the weight of the battery and other components. Furthermore, because the traction motor is positioned rearward of the battery, it is easy to eliminate or shorten the drive shaft between the traction motor and the transmission device, which is located further rearward. Furthermore, because the traction motor is positioned toward the rear, space is available between the battery and the traction motor in plan view to accommodate components. Furthermore, because the traction motor is positioned between the left and right frame members, a compact configuration can be achieved.

[0019] In the electric tractor, The following configuration It is preferable to In other words, this electric tractor is oil The hydraulic pump includes a hydraulic pump and a pump motor. The pump motor is an electric motor that generates power to drive the hydraulic pump. The vehicle frame includes a pair of left and right frame members. At least a portion of the pump motor is located outboard of the frame members in the left-right direction of the vehicle.

[0020] This allows the pump motor to be compactly arranged in a position where it does not interfere with surrounding components.

[0021] The electric tractor preferably has the following configuration: the electric tractor includes a pump inverter for controlling the rotation speed of the pump motor, and at least a portion of the pump inverter is positioned laterally opposite to the pump motor and laterally outboard of the frame member.

[0022] This allows the pump inverter to be compactly positioned so that it does not interfere with surrounding components. Also, since the pump motor and pump inverter are allocated to the left and right sides of the machine frame, the machine balance can be improved.

[0023] In the electric tractor, The following configuration It is preferable to In other words, this electric tractor is Po Pump inverter of The pump inverter controls the rotation speed of the electric motor. The machine frame includes a pair of left and right frame members. At least a portion of the pump inverter is located outward in the left-right direction from the frame members.

[0024] This allows the pump inverter to be compactly arranged in a position where it does not interfere with surrounding components. [Brief explanation of the drawings]

[0025] [Figure 1] 1 is a side view showing the overall configuration of an electric tractor according to an embodiment of the present invention; [Figure 2] FIG. 2 is a perspective view showing a chassis of the electric tractor. [Figure 3] FIG. 10 is a perspective view showing the configuration inside the hood of an electric tractor with another configuration. [Figure 4] FIG. 4 is a perspective view of the inside of the hood from a different perspective than FIG. 3. DETAILED DESCRIPTION OF THE INVENTION

[0026] Next, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a side view of an electric tractor 1 according to an embodiment of the present invention.

[0027] The electric tractor 1 shown in Fig. 1 is configured as an agricultural tractor. The electric tractor 1 includes a traveling machine body 2 as a vehicle body portion that can travel in a farm field.

[0028] A work machine 3 can be connected to the traveling machine body 2. Examples of the work machine 3 include a cultivator (tillage machine), plow, fertilizer applicator, grass cutter, and seed sowing machine. Various types of work machines 3 can be attached to the traveling machine body 2 as needed.

[0029] The front of the traveling body 2 of the electric tractor 1 is supported by a pair of left and right front wheels 7, and the rear of the traveling body 2 is supported by a pair of left and right rear wheels 8.

[0030] A chassis 20, which is a strength member of the electric tractor 1, is provided below the traveling machine body 2. The chassis 20 is configured to include a housing 22 of a transmission device 21 and a machine body frame 30.

[0031] A speed change mechanism, for example, made up of a gear train, is disposed inside the transmission device 21. The transmission device 21 changes the speed of power input from a travel motor 41 (described later). The power changed in speed by the transmission device 21 is transmitted to a front axle device 51 and a rear axle device 52.

[0032] The transmission device 21 includes a housing 22 that houses a speed change mechanism. This housing is made of, for example, a casting. The housing of the transmission device 21 has high mechanical rigidity, and is therefore used as part of the chassis 20.

[0033] As shown in Fig. 2, the vehicle frame 30 is configured to include a pair of frame members 31, 32 arranged on the left and right. Each of the two frame members 31, 32 is formed in a plate shape and arranged so that its thickness direction is aligned with the left-right direction of the vehicle. An appropriate gap is formed between the two frame members 31, 32.

[0034] The rear end of each of the frame members 31, 32 is fixed to the transmission device 21. The frame members 31, 32 extend forward in a generally horizontal direction from the joint with the transmission device 21. Each of the frame members 31, 32 is formed by connecting multiple plate-shaped members in the front-to-rear direction.

[0035] The two frame members 31, 32 are arranged parallel to each other. As shown in Fig. 2, the aircraft frame 30 is provided with a plurality of connecting members 33, 34, 35. The connecting members 33, 34, 35 are arranged to extend in the left-right direction and connect the two frame members 31, 32 to each other. This increases the mechanical rigidity of the aircraft frame 30.

[0036] The front axle device 51 is connected to the vehicle frame 30 provided on the chassis 20. The front axle device 51 supports the weight of the front part of the chassis 20. The front wheels 7 shown in FIG. 1 are rotatably supported on both ends of the front axle device 51 in the vehicle width direction. The traveling vehicle body 2 is equipped with a transmission shaft 27 shown in FIG. 2. The transmission shaft 27 connects the front axle device 51 and the transmission device 21. Power is input to the front axle device 51 from the transmission device 21 via the transmission shaft 27. The front axle device 51 transmits the input power to the front wheels 7. As a result, the front wheels 7 are driven.

[0037] The rear axle units 52 are arranged in a pair on the left and right sides with the housing 22 of the transmission unit 21 in between. Each rear axle unit 52 is fixed to a side surface of the housing 22 of the transmission unit 21. The rear axle units 52 support the weight of the rear part of the chassis 20. A rear wheel 8 shown in FIG. 1 is rotatably supported on the outer end of each rear axle unit 52 in the vehicle width direction. The rear axle units 52 transmit power input from the transmission unit 21 to the rear wheels 8. As a result, the rear wheels 8 are driven.

[0038] A hood 9 is disposed at the front of the traveling machine body 2. A battery 15 is housed inside the hood 9. The battery 15 supplies power to a plurality of electric motors that are the drive sources of the electric tractor 1. The battery 15 may have any configuration and may be, for example, a lithium-ion secondary battery. The battery 15 is fixed so as to be placed on top of the machine frame 30. Therefore, the battery 15 is located higher than the axles 7a of the front wheels 7.

[0039] In the interior space of the hood 9, an on-board charging device 16 is provided above the battery 15. The on-board charging device 16 can charge the battery 15 by converting, for example, a household AC power supply voltage into a DC voltage.

[0040] A BMS unit (battery management system) 17 is provided in front of the battery 15 in the interior space of the hood 9. BMS is an abbreviation for battery management system. The BMS unit 17 is configured as a computer and is a type of ECU. The BMS unit 17 has the function of monitoring the voltage, temperature, etc. of the battery 15 and detecting abnormalities. The BMS unit 17 also estimates the remaining charge of the battery 15 and outputs the obtained information to the on-board charging device 16. This makes it possible to prevent the battery 15 from being overcharged.

[0041] A driver's seat 13 on which an operator can sit is provided behind the hood 9. A plurality of operating members that can be operated by the operator are arranged near the driver's seat 13. An example of an operating member is a steering wheel 12 arranged in front of the driver's seat 13. Although details are omitted, the operating members include, in addition to the steering wheel 12, a main shift lever, an auxiliary shift lever, a PTO shift lever, a hydraulic operation switch, a hydraulic operation lever, and the like.

[0042] The transmission 21 described above is disposed below the driver's seat 13. A housing 42 of a traction motor 41 is fixed to the front end of the housing 22 of the transmission 21. The traction motor 41 is configured as an electric motor, and its output shaft, although not shown, is oriented in the fore-and-aft direction of the vehicle body. The output shaft of the traction motor 41 protrudes rearward from the housing 42 and is connected to the input shaft of the transmission 21.

[0043] A well-known three-point link mechanism 25 is provided at the rear of the traveling machine body 2, and the work implement 3 can be connected to the traveling machine body 2 via this three-point link mechanism 25. A lifting actuator 26 is disposed near the three-point link mechanism 25. The lifting actuator 26 is configured, for example, by a hydraulic cylinder. By driving the lifting actuator 26, the height and posture of the work implement 3 attached to the traveling machine body 2 can be adjusted.

[0044] As shown in Figure 2, a hydraulic pump 43 is attached to the chassis 20 to supply hydraulic oil to various hydraulic devices. Hydraulic devices to which hydraulic oil is supplied include, but are not limited to, the lift actuator 26 and a hydraulic steering device (not shown). The hydraulic pump 43 is fixed to a surface of one frame member 31 that constitutes the vehicle frame 30, facing inward in the vehicle width direction. Although not shown, the drive input shaft of the hydraulic pump 43 is oriented along the vehicle width direction.

[0045] A pump motor 44 for driving the hydraulic pump 43 is attached to the chassis 20. The pump motor 44 is configured as an electric motor. The pump motor 44 is arranged to be aligned with the hydraulic pump 43 in the width direction of the machine body.

[0046] The pump motor 44 is fixed to a surface of the frame member 31 that faces outward in the width direction of the vehicle. In other words, the pump motor 44 is disposed on the opposite side of the frame member 31 from the hydraulic pump 43. Therefore, the housing of the pump motor 44 is located outward in the width direction of the vehicle than the vehicle frame 30.

[0047] Although not shown, the output shaft of the pump motor 44 is oriented along the width direction of the machine body. The output shaft of the pump motor 44 protrudes toward the center of the machine body so as to penetrate the frame member 31, and is connected to the drive input shaft of the hydraulic pump 43.

[0048] A pump inverter 45 for changing the rotation speed of the pump motor 44 is attached to the machine body frame 30. The pump inverter 45 is arranged so as to be aligned with the hydraulic pump 43 and the pump motor 44 in the approximate width direction of the machine body.

[0049] The pump inverter 45 is fixed to the frame member 32, of the pair of left and right frame members 31, 32 constituting the vehicle body frame 30, opposite the frame member 31 to which the pump motor 44 is attached. The pump inverter 45 is fixed to the surface of the frame member 32 that faces outward in the vehicle body width direction. Therefore, the pump inverter 45 is located outward of the vehicle body frame 30 on the opposite side to the pump motor 44 in the vehicle body width direction.

[0050] With this layout, the hydraulic pump 43, pump motor 44, and pump inverter 45 can be well supported by the chassis 20. Furthermore, since the pump motor 44 is disposed on one side of the machine frame 30 in the width direction of the machine body, and the pump inverter 45 is disposed on the opposite side, it is easy to ensure the balance of the machine body.

[0051] A PTO shaft (not shown) is disposed on the traveling body 2. The PTO shaft is connected to the drive input shaft of the work implement 3. To drive the PTO shaft, a PTO drive motor (not shown) is provided at an appropriate position on the traveling body 2. The PTO drive motor is configured as an electric motor. The work implement 3 can be driven by the PTO drive motor via the PTO shaft.

[0052] The electric tractor 1 of this embodiment is equipped with a traveling motor 41 as a drive source for traveling the traveling body 2. On the other hand, as a variation of the tractor specifications, it is also possible to use a configuration in which an engine is provided instead of an electric motor while keeping the chassis 20 in common.

[0053] Consider a case where the engine and clutch housings are used as part of the chassis in an engine specification. In this configuration, if you try to change to an electric motor specification, the housing will lose its strength as a strength member, and the chassis will not have sufficient strength. Therefore, it is difficult to share the chassis between the two specifications.

[0054] In this regard, in the chassis 20 of this embodiment, the vehicle frame 30 made up of a pair of plate-like members extends from the transmission device 21 to near the front end of the traveling vehicle body 2. In other words, the vehicle frame 30 is not interrupted in the middle. When this chassis 20 is applied to an engine specification, the engine can be installed in the space inside the hood 9 where the battery 15 was installed. In this way, when the chassis 20 configured in this embodiment is used for both the electric motor specification and the engine specification, the mechanical strength can be easily ensured for either specification.

[0055] In this embodiment, the traction motor 41 is disposed close to the front side of the transmission device 21. In this embodiment, the housing 42 of the traction motor 41 is fixed directly to the front part of the housing 22 of the transmission device 21. At least a portion of the housing 42 is disposed so as to be inserted between the left and right frame members 31, 32.

[0056] This layout makes it possible to directly connect the output shaft of the travel motor 41 and the input shaft of the transmission device 21. Therefore, a drive shaft connecting the two is omitted. However, the output shaft of the travel motor 41 and the input shaft of the transmission device 21 may be connected via a short drive shaft that is not exposed to the outside.

[0057] This direct-connect layout allows the travel motor 41 to be positioned toward the rear, and as shown in Fig. 2, an appropriate space S1 can be secured between the battery 15 and the travel motor 41 and between the left and right frame members 31, 32 in a plan view. In this embodiment, the hydraulic pump 43 and hydraulic piping 46 that guides hydraulic oil are disposed in this space. Therefore, the space can be effectively utilized to arrange the hydraulic pump 43 and other components in a compact manner.

[0058] As described above, the electric tractor 1 of this embodiment includes the battery 15, the transmission device 21, the body frame 30, the rear axle device 52, and the front axle device 51. The transmission device 21 changes the speed of input power and outputs it. The body frame 30 is fixed to the transmission device 21. The rear axle device 52 supports the rear wheels 8 and transmits the power output from the transmission device 21 to the rear wheels 8. The front axle device 51 supports the front wheels 7. The rear axle device 52 and the front axle device 51 support the chassis 20. The chassis 20 is configured to include the body frame 30 and the transmission device. The battery 15 is supported by the chassis 20.

[0059] This allows the electric tractor 1 to have a strong support structure that can support the weight of the battery 15 and the like.

[0060] In the electric tractor 1 of this embodiment, the battery 15 is located above the axle of the front wheels 7 .

[0061] This makes it possible to easily ensure the minimum ground clearance of the electric tractor 1.

[0062] In the electric tractor 1 of this embodiment, an on-board charging device 16 that controls charging of the battery 15 is disposed above the battery 15.

[0063] This allows a compact arrangement including the battery 15 and the on-board charging device 16 to be realized.

[0064] The electric tractor 1 of this embodiment also includes a body frame 30, a battery 15, a travel motor 41, and a transmission device 21. The travel motor 41 is an electric motor that generates power to propel the traveling body 2. The transmission device 21 is disposed rearward of the body from the battery 15 in a plan view. The body frame 30 includes frame members 31 disposed in pairs on the left and right. The travel motor 41 is disposed rearward of the battery 15 and forward of the transmission device 21 in a plan view, and is disposed between the left and right frame members 31, 32.

[0065] This allows the electric tractor 1 to have a strong support structure that can support the weight of the battery 15 and other components. Furthermore, because the travel motor 41 is located rearward of the battery 15, it is easy to omit or shorten the length of the drive shaft between the travel motor 41 and the transmission device 21, which is located further rearward. Because the travel motor 41 is located toward the rear, space is available between the battery 15 and the travel motor 41 in plan view in which components can be arranged. Because the travel motor 41 is located between the left and right frame members 31, 32, a compact configuration can be achieved.

[0066] The electric tractor 1 of this embodiment includes a body frame 30, a hydraulic pump 43, and a pump motor 44. The pump motor 44 is an electric motor that generates power to drive the hydraulic pump 43. The body frame 30 includes frame members 31, 32 that are arranged in a left-right pair. At least a portion of the pump motor 44 is located outboard of the frame members 31, 32 in the left-right direction of the body.

[0067] This allows the pump motor 44 to be compactly arranged in a position where it does not interfere with surrounding components.

[0068] The electric tractor 1 of this embodiment is equipped with a pump inverter 45 for controlling the rotation speed of the pump motor 44. At least a portion of the pump inverter 45 is located on the left-right opposite side of the pump motor 44 and outside the frame members 31, 32 in the left-right direction.

[0069] This allows the pump inverter 45 to be compactly arranged in a position where it does not interfere with surrounding members.

[0070] The electric tractor 1 of this embodiment includes a body frame 30 and a pump inverter 45. The pump inverter 45 controls the rotation speed of a pump motor 44, which is an electric motor. The body frame 30 includes frame members 31, 32 arranged in a pair on the left and right. At least a portion of the pump inverter 45 is located outward in the left-right direction from the frame members 31, 32.

[0071] This allows the pump inverter 45 to be compactly arranged in a position where it does not interfere with surrounding members, and can be firmly supported by the machine frame 30.

[0072] Next, another configuration for supporting the battery 15 and other components at the front of the aircraft will be described with reference to Figures 3 and 4. In the following description, components that are the same as or similar to those in the above-described embodiment will be denoted by the same reference numerals in the drawings, and descriptions thereof may be omitted.

[0073] 3 and 4, a multi-purpose plate (base member) 61 is disposed on the front of the body frame 30. The multi-purpose plate 61 is a horizontal, plate-like member. The multi-purpose plate 61 is disposed so as to straddle a pair of frame members 31, 32 provided on the body frame 30.

[0074] Two brackets extending outward on the left and right sides are provided on each of the two frame members 31, 32. A vibration-isolating member 62 is attached to each bracket. Each vibration-isolating member 62 is made of a material capable of absorbing impact, such as rubber. The four vibration-isolating members 62 support the underside of the multi-purpose plate 61. This allows the multi-purpose plate 61 to be supported on the aircraft frame 30 in a vibration-isolating manner.

[0075] The battery 15 described above is placed on the upper surface of the multi-purpose plate 61. The battery 15 is fixed to the multi-purpose plate 61 by a plurality of fixing blocks 63 or the like. To increase rigidity, the multi-purpose plate 61 may be formed with a protrusion that protrudes upward or downward.

[0076] A support frame 64 is provided on the upper side of the multi-purpose plate 61. The support frame 64 is configured by combining multiple linearly elongated members. The support frame 64 is disposed so as to surround the battery 15. The support frame 64 is fixed to the upper surface of the multi-purpose plate 61.

[0077] An on-board charging device 16 is fixed to the top surface of the battery 15. A BMS unit 17 is fixed to the front surface of the battery 15.

[0078] A terminal box 18 is disposed in front of the on-board charging device 16. The terminal box 18 is fixed to the upper part of the support frame 64. A plurality of electric wires (not shown) are connected to the terminal box 18. The terminal box 18 relays electricity between the battery 15 and the inverter 19, for example.

[0079] An inverter 19 is fixed to the underside of the multi-purpose plate 61. The inverter 19 controls the rotation speed of the travel motor 41. The inverter 19 is supported so as to be suspended from the multi-purpose plate 61. The inverter 19 is disposed at the front end of the vehicle frame 30, between a pair of left and right frame members 31, 32.

[0080] A cooling fan (cooling device) 38 is disposed on one of the left and right sides of the battery 15. A water-cooling system (not shown) is provided for cooling the battery 15. The cooling fan 38 blows air toward a radiator provided in the water-cooling system.

[0081] Thus, in the example of Figures 3 and 4, an electric unit consisting of a battery 15, an on-board charging device 16, a BMS unit 17, a terminal box 18, an inverter 19, and a cooling fan 38 is arranged on a multi-purpose plate 61 located above the body frame 30.

[0082] Therefore, if the multi-purpose plate 61 is removed from the machine frame 30, the battery 15, on-board charging device 16, BMS unit 17, terminal box 18, inverter 19, and cooling fan 38 are located on the multi-purpose plate 61 side. In this way, an electric unit can be constructed with the multi-purpose plate 61 as a base member, making it easy to share the chassis 20 with the engine specifications described above. In addition, this makes it easy to manufacture tractors with electric motor specifications.

[0083] As described above, the electric tractor 1 of this embodiment includes the plate-shaped multi-purpose plate 61 and the vibration-isolating member 62. The vibration-isolating member 62 supports the multi-purpose plate 61 on the vehicle frame 30 in a vibration-isolating manner. The battery 15 is fixed to the multi-purpose plate 61.

[0084] This allows the support structure for the battery 15 to be realized with a simple configuration using the plate-shaped multi-purpose plate 61.

[0085] The electric tractor 1 of this embodiment also includes an on-board charging device 16, a cooling fan 38, a BMS unit 17, an inverter 19, and a terminal box 18. The on-board charging device 16 controls charging of the battery 15. The cooling fan 38 cools the battery 15. The BMS unit 17 controls the battery 15. The inverter 19 controls the rotation speed of a traction motor 41 connected to the battery 15. The terminal box 18 relays electricity. When the multi-purpose plate 61 is separated from the body frame 30, the on-board charging device 16, cooling fan 38, BMS unit 17, inverter 19, and terminal box 18, in addition to the battery 15, are arranged on the multi-purpose plate 61 side.

[0086] This allows the electric-related devices to be unitized based on the multi-purpose plate 61, and the unit can be disposed on the traveling body 2. Therefore, the electric tractor 1 can be easily handled during manufacture, etc.

[0087] The preferred embodiment of the present invention has been described above, but the above configuration can be modified, for example, as follows.

[0088] 1 and 2, the lower surface of the battery 15 is at approximately the same height as the upper surface of the vehicle frame 30. Alternatively, the lower part of the battery 15 may be arranged so as to be inserted between the two frame members 31, 32. The lower end of the battery 15 may be arranged at a position lower than the axle of the front wheel 7.

[0089] Above the battery 15, various components (for example, electrical components such as a harness connector) can be arranged, in addition to the in-vehicle charging device 16.

[0090] The battery 15, the on-board charging device 16, and the BMS unit 17 may be disposed arbitrarily inside the hood 9. For example, both the on-board charging device 16 and the BMS unit 17 may be disposed above the battery 15.

[0091] The BMS unit 17 may be disposed above the battery 15, and the on-board charging device 16 may be disposed in front of the battery 15.

[0092] 3 and 4, the arrangement of the on-board charging device 16, BMS unit 17, terminal box 18, inverter 19, and cooling fan 38 can be changed as appropriate. For example, at least one of the on-board charging device 16, BMS unit 17, terminal box 18, and cooling fan 38 can be arranged below the multi-purpose plate 61. The inverter 19 can be arranged above the multi-purpose plate 61.

[0093] The pump motor 44 may be entirely or partially positioned on the left and right outer sides of the machine frame 30. The same applies to the pump inverter 45.

[0094] The pump inverter 45 may be positioned at any location, and may be disposed at the front end of the vehicle frame 30, for example.

[0095] The cooling fan 38 shown in FIG. 3 can be modified so that it simply blows air onto the battery 15 to cool it, instead of blowing air onto the radiator in the water-cooling system.

[0096] In the configurations of Figures 3 and 4, at least one of the on-board charging device 16, BMS unit 17, terminal box 18, inverter 19, etc. can also be attached to the vehicle frame 30 side rather than the multi-purpose plate 61 side.

[0097] The arrangement of the pump motor 44 and the pump inverter 45 shown in FIGS. 1 and 2 can also be applied to a configuration having a multi-purpose plate 61 as shown in FIGS. [Explanation of symbols]

[0098] 1 Electric Tractor 7 Front wheels 7a Front wheel axle 8 rear wheels 15 Battery 16 On-board charging device 17 BMS unit (ECU) 18 Terminal box 19 Inverter 20 chassis 21 Transmission device 30 aircraft frame 31 Frame members 32 Frame members 38 Cooling fan (cooling device) 41 Drive motor 43 Hydraulic pump 44 Pump motor (electric motor) 45 Pump inverter 51 Front axle device 52 Rear axle device 61 Multipurpose plate (base material) 62 Vibration-proof member

Claims

1. Battery and a transmission device that changes the speed of input power and outputs it; a body frame fixed to the transmission device; a rear axle device that supports rear wheels and transmits power output from the transmission device to the rear wheels; a front axle device that supports the front wheels; The bonnet and Equipped with the rear axle device and the front axle device support a chassis including the vehicle body frame and the transmission device; the battery is supported by the chassis; a plate-shaped base member; a vibration-isolating member that supports the base member on the aircraft frame in a vibration-isolating manner; Equipped with the battery is fixed to the base member; an on-board charging device that controls charging of the battery; a cooling device that cools the battery; Equipped with The battery, the on-board charging device, and the cooling device are disposed in an internal space of the hood, An electric tractor, characterized in that when the base member is separated from the vehicle frame, in addition to the battery, the on-board charging device and the cooling device are arranged on the base member side.

2. The electric tractor according to claim 1, The electric tractor is characterized in that the battery is located above the axle of the front wheels.

3. The electric tractor according to claim 1 or 2, An electric tractor, characterized in that an on-board charging device that controls charging of the battery is disposed above the battery.

4. The electric tractor according to claim 1, a travel motor, which is an electric motor that generates power to drive the machine; the transmission device is disposed rearward of the aircraft body relative to the battery in a plan view, the aircraft frame includes frame members arranged in pairs on the left and right, The electric tractor is characterized in that the traction motor is disposed rearward of the battery and forward of the transmission device in a plan view, and is disposed between the left and right frame members.

5. The electric tractor according to claim 1, A hydraulic pump, a pump motor that is an electric motor that generates power for driving the hydraulic pump; Equipped with the aircraft frame includes frame members arranged in pairs on the left and right, An electric tractor, wherein at least a portion of the pump motor is located outboard of the frame member in the left-right direction of the vehicle body.

6. The electric tractor according to claim 5, a pump inverter for controlling the rotation speed of the pump motor; An electric tractor, wherein at least a part of the pump inverter is located on the left-right opposite side of the pump motor and outside the frame member in the left-right direction.

7. The electric tractor according to claim 1, a pump inverter for controlling the rotation speed of the electric motor; the aircraft frame includes frame members arranged in pairs on the left and right, An electric tractor, wherein at least a portion of the pump inverter is located outward in the left-right direction from the frame member.

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