Electric work vehicle

Abstract

To provide an electric work vehicle which has good weight balance thereof in a longitudinal direction and is compact in a lateral width thereof, and in which a power transmission structure between a motor and a transmission device is easily simplified.SOLUTION: An electric work vehicle is provided with a battery 4, a motor M that is driven by electric power supplied from the battery 4, front wheels 10 and rear wheels 11 which are driven by the motor M, a transmission device T arranged closer to a rear side than the battery 4 and behind the motor M, and a front transmission mechanism FT extending forward from the transmission device T, which is configured so that driving force of the motor M is transmitted through the transmission device T and the front transmission mechanism FT to the front wheels 10. Front axles that are axles of the front wheels 10 are arranged in a longitudinal width of the battery 4, below the battery 4, and the motor M is arranged closer to a rear side than the front axles.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an electric work vehicle including a battery, a motor driven by electric power supplied from the battery, and a traveling device driven by the motor.

Background Art

[0002] The work vehicle (referred to as a "tractor" in Patent Document 1) described in Patent Document 1 includes an engine and a traveling device (referred to as "front wheels" and "rear wheels" in Patent Document 1) driven by the engine.

[0003] Further, the work vehicle described in Patent Document 1 includes a transmission device (referred to as a "transmission case" in Patent Document 1) that transmits the driving force of the engine to the traveling device.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the work vehicle described in Patent Document 1, it is conceivable to provide a battery and a motor in place of the engine. Thereby, it is possible to travel without discharging exhaust gas.

[0006] Furthermore, in the work vehicle described in Patent Document 1, it is conceivable to include an inverter that converts DC power from the battery into AC power and supplies it to the motor. Thereby, AC power can be supplied to the motor.

[0007] Here, generally, the size of the transmission device tends to be relatively large. Therefore, the weight of the transmission device tends to be relatively large.

[0008] In addition, when the work vehicle runs on the power from the battery, the larger the battery's storage capacity, the longer the running distance. Therefore, by adopting a battery with a relatively large storage capacity, the running distance can be made relatively long.

[0009] However, the larger the battery's storage capacity, the more likely the battery size is to increase. And the larger the battery size, the greater the battery weight.

[0010] Therefore, the battery weight is likely to become relatively large.

[0011] And depending on the arrangement of the battery, motor, inverter, and transmission, a situation where the weight balance of the machine body in the front-rear direction becomes poor is assumed. Also, a situation where the width of the machine body becomes relatively large is assumed. Also, a situation where the power transmission structure between the motor and the transmission becomes complicated is assumed.

[0012] For example, in a configuration where the transmission is arranged below the battery, in the front-rear direction of the machine body, the weight of the parts where the battery and the transmission are located is likely to become extremely large. As a result, the weight balance of the machine body in the front-rear direction is likely to become poor.

[0013] Also, for example, in a configuration where the motor is arranged on the left side of the battery and the inverter is arranged on the right side of the battery, the space required to arrange the battery, motor, and inverter is likely to be relatively large in the left-right direction of the machine body. As a result, the width of the machine body is likely to become relatively large.

[0014] Also, for example, in a configuration where the motor is arranged in front of the inverter, in the front-rear direction of the machine body, the inverter will be located between the motor and the transmission. Therefore, it is necessary to consider so that the power transmission structure between the motor and the transmission does not interfere with the inverter. As a result, the power transmission structure between the motor and the transmission is likely to become complicated.

[0015] An object of the present invention is to provide an electric work vehicle having a good weight balance of the vehicle body in the front-rear direction, a compact vehicle width, and a power transmission structure between a motor and a transmission that is likely to be simplified.

Means for Solving the Problems

[0016] The features of the present invention include a battery, a motor disposed below the battery and driven by electric power supplied from the battery, a traveling device driven by the motor, and an inverter disposed below the battery and in front of the motor, which converts DC power from the battery into AC power and supplies it to the motor, and a transmission disposed behind the battery and transmitting the driving force of the motor to the traveling device. The motor and the inverter are arranged side by side in the front-rear direction of the vehicle body.

[0017] In the present invention, the transmission is disposed behind the battery. As a result, the battery and the transmission are dispersedly arranged in the front-rear direction of the vehicle body.

[0018] As a result, the weight balance of the vehicle body in the front-rear direction becomes better than when the transmission is disposed below the battery.

[0019] Also, in the present invention, the motor and the inverter are arranged side by side in the front-rear direction below the battery.

[0020] As a result, the space required to arrange the battery, the motor, and the inverter becomes relatively small in the left-right direction of the vehicle body. Therefore, the vehicle width of the vehicle body becomes compact.

[0021] Moreover, in the present invention, the motor is disposed behind the inverter. Therefore, there is no need to consider that the power transmission structure between the motor and the transmission does not interfere with the inverter. As a result, the power transmission structure between the motor and the transmission is likely to be simplified.

[0022] That is, according to the present invention, it is possible to realize an electric work vehicle in which the weight balance of the vehicle body in the front-rear direction is good, the width of the vehicle body is compact, and the power transmission structure between the motor and the transmission device is likely to be simplified.

[0023] Furthermore, in the present invention, it is preferable that the vehicle body includes left and right main frames extending in the front-rear direction of the vehicle body, the inverter is supported by the left and right main frames, and the motor is disposed at a position sandwiched between the left and right main frames.

[0024] According to this configuration, the inverter is stably supported by the left and right main frames.

[0025] Moreover, according to this configuration, the arrangement position of the motor is lower than when the motor is disposed above the left and right main frames. As a result, the center of gravity of the vehicle body is lowered. As a result, the attitude stability of the vehicle body is improved.

[0026] Moreover, according to this configuration, the motor is protected by the left and right main frames. Therefore, it is not necessary to provide a dedicated member for protecting the motor. Therefore, the manufacturing cost is likely to be lower than the case where a dedicated member is provided for protecting the motor.

[0027] Furthermore, in the present invention, it is preferable that the vehicle body includes a radiator and a water pump for pumping cooling water passing through the radiator, and the water pump is disposed in front of the motor and below the inverter.

[0028] According to this configuration, when the motor is disposed at a position sandwiched between the left and right main frames, the water pump is also disposed at a position sandwiched between the left and right main frames. Therefore, the water pump is protected by the left and right main frames. Accordingly, there is no need to provide a dedicated member for protecting the water pump. Thus, compared with the case where a dedicated member is provided for protecting the water pump, the manufacturing cost is likely to be reduced.

[0029] Moreover, according to this configuration, the water pump is disposed below the inverter. Therefore, it is easy to dispose the inverter and the water pump so as to overlap each other in plan view.

[0030] And if the inverter and the water pump are disposed so as to overlap each other in plan view, the space required for disposing the inverter and the water pump is likely to be smaller in the front-rear direction of the aircraft body than when the water pump is disposed in front of or behind the inverter.

[0031] Therefore, according to this configuration, the aircraft body is likely to be compact in the front-rear direction.

[0032] Furthermore, in the present invention, it is preferable that the aircraft body includes a left main frame and a right main frame extending in the front-rear direction of the aircraft body, the inverter is supported by the left main frame and the right main frame, the inverter protrudes to the left side beyond the left end position of the left main frame, and protrudes to the right side beyond the right end position of the right main frame.

[0033] According to this configuration, the vertical length of the inverter is likely to be shorter than when the inverter is configured to fit between the left end position of the left main frame and the right end position of the right main frame. Thereby, the space required for disposing the inverter is likely to be smaller in the vertical direction of the aircraft body.

[0034] Therefore, according to this configuration, the aircraft body is likely to be compact in the vertical direction.

[0035] Furthermore, in the present invention, the inverter is supported by the left main frame and the right main frame via an inverter support portion. The inverter support portion protrudes to the left side of the left end position of the left main frame and protrudes to the right side of the right end position of the right main frame. It is preferable that the battery is supported by the inverter support portion via left and right battery support frames erected on the inverter support portion.

[0036] According to this configuration, the left and right battery support frames can be arranged so that the distance between the left and right battery support frames is wider than the distance between the left and right main frames. Thereby, the battery is more stably supported compared to the case where the distance between the left and right battery support frames is narrower than the distance between the left and right main frames.

[0037] Moreover, the inverter is protected by the left and right battery support frames. Thereby, it is not necessary to provide a dedicated member for protecting the inverter. Therefore, the manufacturing cost is likely to be lower than the case where a dedicated member is provided for protecting the inverter.

[0038] Furthermore, in the present invention, it is preferable to include a partition plate that partitions between the battery and the inverter.

[0039] According to this configuration, heat generated from the battery is less likely to be transmitted to the inverter. Thereby, it becomes easier to avoid the inverter becoming high temperature due to heat generated from the battery.

[0040] Furthermore, in the present invention, it includes a radiator located in front of the battery and a cooling fan that cools the radiator and is located in front of the battery. It is preferable that the cooling fan blows cooling air to the rear side and is arranged in a state spanning the battery and the inverter in the vertical direction of the machine body.

[0041] According to this configuration, the cooling air from the cooling fan flows in a state spanning the battery and the inverter in the vertical direction of the machine body. That is, a part of the cooling air from the cooling fan goes toward the battery, and another part goes toward the inverter.

[0042] Then, the battery is cooled by the cooling air going toward the battery. Also, the inverter is cooled by the cooling air going toward the inverter.

[0043] Therefore, according to this configuration, it becomes possible to cool the battery and the inverter by the cooling air from the cooling fan.

Brief Description of the Drawings

[0044]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Embodiments for Carrying Out the Invention

[0045] Embodiments for carrying out the present invention will be described with reference to the drawings. In the following description, in FIGS. 1 to 3, 6, and 7, the direction of arrow F shown is defined as "front", the direction of arrow B is defined as "rear", in FIGS. 3, 4, and 6, the direction of arrow L shown is defined as "left", and the direction of arrow R is defined as "right". Also, in FIGS. 1, 2, and 4, the direction of arrow U shown is defined as "up", and the direction of arrow D is defined as "down".

[0046] 〔Overall Structure of the Tractor〕 As shown in Fig. 1, the tractor A (corresponding to the "electric working vehicle" according to the present invention) includes left and right front wheels 10 (corresponding to the "traveling device" according to the present invention), left and right rear wheels 11 (corresponding to the "traveling device" according to the present invention), a cover member 12, and a tilling device 13.

[0047] The tractor A also includes a body frame 2 and an operation unit 3.

[0048] The body frame 2 is supported by the left and right front wheels 10 and the left and right rear wheels 11. The tilling device 13 is supported at the rear part of the body frame 2.

[0049] The cover member 12 is arranged at the front part of the body. The operation unit 3 is provided behind the cover member 12.

[0050] The operation unit 3 has a protection frame 30, an operation seat 31, a steering wheel 32, and a floor 33. An operator can sit on the operation seat 31. And the operator can perform various operation operations in the operation unit 3.

[0051] By operating the steering wheel 32, the left and right front wheels 10 are steered. Also, the operator can place his feet on the floor 33 while sitting on the operation seat 31.

[0052] That is, the tractor A includes an operation unit 3 having an operation seat 31 on which an operator can sit.

[0053] The tractor A also includes a traveling battery 4 (corresponding to the "battery" according to the present invention), a motor M, a transmission device T, and a front transmission mechanism FT.

[0054] The cover member 12 is configured to be swingable around an opening / closing axis Q (see Fig. 2) along the left-right direction of the machine body. Accordingly, the cover member 12 is configured to be openable and closable. When the cover member 12 is in the closed state, the traveling battery 4 is housed in the cover member 12. And the traveling battery 4 supplies electric power to the motor M.

[0055] The motor M is disposed below the traveling battery 4. And the motor M is driven by the electric power supplied from the traveling battery 4. The driving force of the motor M is transmitted to the transmission device T.

[0056] The transmission device T is located behind the traveling battery 4 and is disposed behind the motor M. Also, the front transmission mechanism FT extends forward from the transmission device T. And the transmission device T shifts the driving force received from the motor M and transmits it to the left and right rear wheels 11. Also, the driving force is transmitted from the transmission device T to the left and right front wheels 10 via the front transmission mechanism FT. Thereby, the left and right front wheels 10 and the left and right rear wheels 11 are driven.

[0057] That is, the tractor A includes a motor M that is disposed below the traveling battery 4 and is driven by the electric power supplied from the traveling battery 4. Also, the tractor A includes the left and right front wheels 10 and the left and right rear wheels 11 that are driven by the motor M.

[0058] Also, in this way, the tractor A is disposed behind the traveling battery 4 and includes a transmission device T that transmits the driving force of the motor M to the left and right front wheels 10 and the left and right rear wheels 11.

[0059] Also, the transmission device T transmits a part of the driving force received from the motor M to the tilling device 13. Thereby, the tilling device 13 is driven.

[0060] With the above configuration, the tractor A can perform tilling work with the tilling device 13 while traveling by the left and right front wheels 10 and the left and right rear wheels 11.

[0061] 〔Arrangement of Travel Battery, Motor, and Inverter〕 As shown in FIGS. 2 to 4, the travel battery 4 is disposed above the body frame 2. And a ventilation space S is formed between the body frame 2 and the travel battery 4.

[0062] That is, the tractor A includes the travel battery 4 disposed above the body frame 2.

[0063] In addition, the ventilation space S is a space configured to be ventilable.

[0064] The tractor A also includes an inverter 14. The inverter 14 is disposed below the travel battery 4. Also, the inverter 14 is disposed on the front side of the motor M.

[0065] And the inverter 14 is configured to convert DC power from the travel battery 4 into AC power and supply it to the motor M.

[0066] That is, the tractor A includes the inverter 14 disposed below the travel battery 4 and on the front side of the motor M, and configured to convert DC power from the travel battery 4 into AC power and supply it to the motor M.

[0067] The motor M and the inverter 14 are arranged side by side in the longitudinal direction of the body.

[0068] In addition, a first space S1 is formed between the inverter 14 and the travel battery 4. The first space S1 is included in the ventilation space S. That is, the first space S1 is a space configured to be ventilable.

[0069] In addition, a second space S2 is formed between the motor M and the travel battery 4. The second space S2 is included in the ventilation space S. That is, the second space S2 is a space configured to be ventilable.

[0070] The motor M is arranged so as to be in contact with the ventilation space S.

[0071] That is, the motor M is in contact with the ventilation space S.

[0072] The airframe frame 2 has left and right main frames 20 and an inverter support portion 21. The left and right main frames 20 extend in the longitudinal direction of the airframe.

[0073] That is, the tractor A is provided with a left main frame 20 and a right main frame 20 that extend in the longitudinal direction of the airframe.

[0074] The motor M is arranged at a position sandwiched between the left and right main frames 20.

[0075] The inverter support portion 21 is provided in a state spanning the left and right main frames 20. Further, the inverter support portion 21 is supported by the left and right main frames 20. And the inverter 14 is supported by the inverter support portion 21.

[0076] That is, the inverter 14 is supported by the left main frame 20 and the right main frame 20 via the inverter support portion 21.

[0077] In FIG. 3, a first left end position LE1, a second left end position LE2, and a third left end position LE3 are shown. The first left end position LE1 is the left end position of the left main frame 20. The second left end position LE2 is the left end position of the inverter 14. The third left end position LE3 is the left end position of the inverter support portion 21.

[0078] As shown in FIG. 3, the second left end position LE2 is located to the left of the first left end position LE1. That is, the inverter 14 protrudes to the left of the left end position of the left main frame 20.

[0079] Also, the third left end position LE3 is located to the left of the first left end position LE1 and the second left end position LE2. That is, the inverter support portion 21 protrudes to the left of the left end position of the left main frame 20.

[0080] Also, in FIG. 3, a first right end position RE1, a second right end position RE2, and a third right end position RE3 are shown. The first right end position RE1 is the right end position of the right main frame 20. The second right end position RE2 is the right end position of the inverter 14. The third right end position RE3 is the right end position of the inverter support portion 21.

[0081] As shown in FIG. 3, the second right end position RE2 is located to the right of the first right end position RE1. That is, the inverter 14 protrudes to the right of the right end position of the right main frame 20.

[0082] Also, the third right end position RE3 is located to the right of the first right end position RE1 and the second right end position RE2. That is, the inverter support portion 21 protrudes to the right of the right end position of the right main frame 20.

[0083] That is, the inverter 14 protrudes to the left of the left end position of the left main frame 20 and also protrudes to the right of the right end position of the right main frame 20.

[0084] Also, the inverter support portion 21 protrudes to the left of the left end position of the left main frame 20 and also protrudes to the right of the right end position of the right main frame 20.

[0085] As shown in FIGS. 2 to 4, the tractor A includes left and right first support frames 51 (corresponding to the "battery support frame" according to the present invention), left and right second support frames 52 (corresponding to the "battery support frame" according to the present invention), and a battery support portion 53.

[0086] The left and right first support frames 51 are located in front of the left and right second support frames 52. Also, both the left and right first support frames 51 and the left and right second support frames 52 are erected on the inverter support portion 21.

[0087] That is, both the left and right first support frames 51 and the left and right second support frames 52 are erected on the body frame 2.

[0088] Also, a plate-shaped support portion 38 and a later-described plate-shaped partition member 56 are provided between the motor M and the traveling battery 4. Both the plate-shaped support portion 38 and the plate-shaped partition member 56 are in a horizontal posture. Also, the plate-shaped partition member 56 is located above the plate-shaped support portion 38.

[0089] Also, the rear support frame 59 is supported by the body frame 2. Also, the rear support frame 59 supports the rear end portion of the battery support portion 53 via the plate-shaped support portion 38 and the plate-shaped partition member 56.

[0090] The battery support portion 53 is disposed above the body frame 2. And the battery support portion 53 is supported by the left and right first support frames 51, second support frames 52, and rear support frame 59. And the traveling battery 4 is supported by the battery support portion 53.

[0091] That is, the tractor A includes a battery support portion 53 that is disposed above the body frame 2 and supports the traveling battery 4.

[0092] With the above configuration, the traveling battery 4 is supported by the inverter support portion 21 via the battery support portion 53 and the left and right first support frames 51 and the left and right second support frames 52.

[0093] That is, the traveling battery 4 is supported by the inverter support portion 21 via the left and right first support frames 51 erected on the inverter support portion 21. Further, the traveling battery 4 is supported by the inverter support portion 21 via the left and right second support frames 52 erected on the inverter support portion 21.

[0094] Further, a left ventilation opening K is formed by the body frame 2, the battery support portion 53, the left first support frame 51, and the left second support frame 52.

[0095] Further, a right ventilation opening K is formed by the body frame 2, the battery support portion 53, the right first support frame 51, and the right second support frame 52.

[0096] And the left and right ventilation openings K communicate with the ventilation space S, respectively.

[0097] That is, the ventilation space S communicates with the left and right ventilation openings K.

[0098] Further, as shown in FIG. 2, the battery support portion 53 has a plate-shaped bottom plate portion 53a (corresponding to the "partition plate" according to the present invention). The bottom plate portion 53a is provided in a horizontal posture. And the bottom plate portion 53a partitions between the traveling battery 4 and the inverter 14.

[0099] That is, the tractor A includes the bottom plate portion 53a that partitions between the traveling battery 4 and the inverter 14.

[0100] 〔Arrangement of the first plate member and the second plate member〕 As shown in FIGS. 2 and 4, the tractor A includes a first plate member 54 and a second plate member 55.

[0101] The first plate-shaped member 54 and the second plate-shaped member 55 are each provided in a state extending across the left and right main frames 20. Also, the first plate-shaped member 54 is located on the front side of the second plate-shaped member 55. And both the first plate-shaped member 54 and the second plate-shaped member 55 are supported by the left and right main frames 20.

[0102] That is, the airframe frame 2 supports the first plate-shaped member 54 and the second plate-shaped member 55.

[0103] Both the first plate-shaped member 54 and the second plate-shaped member 55 are arranged in a horizontal posture below the ventilation space S.

[0104] 〔Configuration of the cover member〕 As shown in FIGS. 1 and 3, the cover member 12 has an introduction portion 12a. The introduction portion 12a is configured to be able to introduce outside air into the inside of the cover member 12. The introduction portion 12a is provided at the front end portion of the cover member 12.

[0105] In the present embodiment, the introduction portion 12a is constituted by a plurality of small holes. However, the present invention is not limited to this, and the introduction portion 12a may be in any other form. For example, the introduction portion 12a may be constituted by one hole. Also, the introduction portion 12a may include a blower for introducing outside air.

[0106] Also, the cover member 12 has left and right discharge portions 12b. The left and right discharge portions 12b are configured to be able to discharge the air inside the cover member 12 to the outside.

[0107] That is, the cover member 12 has left and right discharge portions 12b capable of discharging the air inside the cover member 12 to the outside.

[0108] The left discharge portion 12b is provided at the left side portion of the cover member 12. Also, the right discharge portion 12b is provided at the right side portion of the cover member 12.

[0109] And the left discharge part 12b is located to the left of the traveling battery 4. Also, the right discharge part 12b is located to the right of the traveling battery 4. That is, the left and right discharge parts 12b are respectively located on the lateral sides of the traveling battery 4.

[0110] In the present embodiment, the left and right discharge parts 12b are each composed of a plurality of small holes. However, the present invention is not limited to this, and the left and right discharge parts 12b may be in any other form. For example, the left and right discharge parts 12b may each be composed of one hole. Also, the left and right discharge parts 12b may include a blower for air discharge.

[0111] 〔Arrangement of Water Pump, Radiator, and Fan〕 As shown in FIGS. 2 to 4, the tractor A includes a radiator 15 and a water pump 16. The radiator 15 is arranged in front of the traveling battery 4.

[0112] That is, the tractor A includes a radiator 15 located in front of the traveling battery 4.

[0113] The radiator 15 and the water pump 16 are included in the cooling water path in the tractor A. When the water pump 16 pumps the cooling water, the cooling water circulates through this cooling water path. And the cooling water is cooled by passing through the radiator 15.

[0114] That is, the tractor A includes a water pump 16 that pumps the cooling water passing through the radiator 15.

[0115] And the water pump 16 is arranged in front of the motor M and below the inverter 14. Also, the water pump 16 is supported by the first plate-like member 54.

[0116] In addition, the tractor A is provided with a cooling fan 17. The cooling fan 17 is disposed in front of the traveling battery 4. That is, the cooling fan 17 is located on the front side of the traveling battery 4.

[0117] When the cover member 12 is in the closed state, the radiator 15 and the cooling fan 17 are housed in the cover member 12.

[0118] That is, the tractor A is provided with a cover member 12 that houses the cooling fan 17 and the traveling battery 4.

[0119] Also, the cooling fan 17 is disposed so as to span the traveling battery 4 and the ventilation space S in the vertical direction of the vehicle body. Also, the cooling fan 17 is disposed so as to span the traveling battery 4 and the inverter 14 in the vertical direction of the vehicle body.

[0120] And the cooling fan 17 sends cooling air to the rear side. As a result, outside air is introduced into the inside of the cover member 12 through the introduction portion 12a and passes through the radiator 15. As a result, the radiator 15 is cooled.

[0121] That is, the cooling fan 17 cools the radiator 15 and is located on the front side of the traveling battery 4.

[0122] Also, the cooling fan 17 sends cooling air to the front portion of the traveling battery 4 and the ventilation space S.

[0123] That is, the tractor A is provided with a cooling fan 17 that is disposed in front of the traveling battery 4 and sends cooling air to the traveling battery 4.

[0124] At least a part of the cooling air sent from the cooling fan 17 to the front portion of the traveling battery 4 circulates to the left and right of the traveling battery 4 and is discharged from the left and right discharge portions 12b. As a result, the front portion and the lateral portions of the traveling battery 4 are cooled.

[0125] A part of the cooling air sent from the cooling fan 17 to the ventilation space S reaches the first space S1, then passes through the left and right ventilation openings K and the left and right discharge parts 12b, and is discharged to the outside of the cover member 12.

[0126] Thereby, the lower part of the traveling battery 4 and the inverter 14 are cooled.

[0127] Also, another part of the cooling air sent from the cooling fan 17 to the ventilation space S reaches the first space S1, then flows through the ventilation space S as it is and passes through the second space S2.

[0128] Thereby, the lower part of the traveling battery 4, the inverter 14, and the motor M are cooled.

[0129] 〔Configuration regarding the wind deflector〕 As shown in FIG. 2, a plate-shaped partition member 56 in a horizontal posture is provided between the battery support part 53 and the motor M.

[0130] The plate-shaped partition member 56 has a wind deflector 56a. The wind deflector 56a is formed by bending the front end part of the plate-shaped partition member 56 downward. Therefore, the wind deflector 56a is in a vertical posture. Thereby, the wind deflector 56a faces the cooling fan 17.

[0131] That is, the tractor A includes the wind deflector 56a in a posture facing the cooling fan 17.

[0132] And the wind deflector 56a is disposed in front of the second space S2 below the traveling battery 4.

[0133] Thereby, among the cooling air flowing through the ventilation space S, the cooling air flowing toward the second space S2 is guided downward by the wind deflector 56a than the wind deflector 56a. Thereby, the cooling air easily heads toward the motor M. As a result, the motor M is cooled well by the cooling air.

[0134] 〔Arrangement of auxiliary battery, voltage converter, etc.〕 As shown in FIGS. 3 to 5, the tractor A is provided with a reserve tank 5 for the radiator 15. The reserve tank 5 can store cooling water. Further, the reserve tank 5 is disposed on the right side of the radiator 15 in front of the traveling battery 4.

[0135] Also, as shown in FIGS. 2 to 5, the tractor A is provided with an auxiliary battery 18 and a voltage converter 19. The auxiliary battery 18 supplies power to various auxiliary machines such as the cooling fan 17.

[0136] Also, power is sent from the traveling battery 4 to the voltage converter 19. Then, the voltage converter 19 steps down the power from the traveling battery 4 and supplies it to the auxiliary battery 18.

[0137] That is, the tractor A is disposed in front of the traveling battery 4 and is provided with a voltage converter 19 that steps down the power from the traveling battery 4 and supplies it to the auxiliary battery 18.

[0138] The auxiliary battery 18 and the voltage converter 19 are disposed on the right side of the radiator 15 in front of the traveling battery 4. Further, the voltage converter 19 is disposed in a state where the longitudinal direction of the voltage converter 19 is along the vertical direction of the machine body.

[0139] Then, as shown in FIG. 3, the voltage converter 19 and the radiator 15 are disposed side by side in a plan view. Also, the radiator 15, the voltage converter 19, and the auxiliary battery 18 are disposed side by side in a plan view.

[0140] Note that the voltage converter 19 is disposed at a position sandwiched between the radiator 15 and the auxiliary battery 18 in a plan view.

[0141] Also, the radiator 15, the voltage converter 19, and the reserve tank 5 are disposed side by side in a plan view.

[0142] Further, the voltage converter 19 is disposed at a position sandwiched between the radiator 15 and the reserve tank 5 in a plan view.

[0143] Also, as shown in FIGS. 3 and 4, the reserve tank 5 is disposed above the auxiliary battery 18. The reserve tank 5 and the auxiliary battery 18 are arranged side by side in the vertical direction of the machine body.

[0144] Also, as shown in FIGS. 2 and 3, the tractor A is provided with an oil cooler CL. The hydraulic oil in the tractor A is cooled by passing through the oil cooler CL.

[0145] 〔Configuration Regarding Radiator Frame〕 As shown in FIGS. 2, 3, and 5, the radiator 15 is supported by a portal-type radiator frame 57. The radiator frame 57 is arranged to surround the radiator 15.

[0146] That is, the tractor A is arranged to surround the radiator 15 and includes a portal-type radiator frame 57 that supports the radiator 15.

[0147] The radiator frame 57 has a left side plate 57a, a top plate 57b, a right side plate 57c, a first top plate support portion 57d, and a second top plate support portion 57e.

[0148] The left side plate 57a is located at the left part of the radiator frame 57. The top plate 57b is located at the upper part of the radiator frame 57. The right side plate 57c is located at the right part of the radiator frame 57.

[0149] The left side plate 57a and the right side plate 57c are each in a vertical posture and arranged side by side left and right. Also, the left side plate 57a and the right side plate 57c are arranged in a posture facing each other.

[0150] The first top plate support portion 57d is provided so as to extend leftward from the upper end portion of the left side plate 57a. Further, the second top plate support portion 57e is provided so as to extend rightward from the upper end portion of the right side plate 57c. And the top plate 57b is placed and supported on the upper surface of the first top plate support portion 57d and the upper surface of the second top plate support portion 57e.

[0151] And the voltage converter 19 is attached to the radiator frame 57. More specifically, the voltage converter 19 is attached to the right surface of the right side plate 57c.

[0152] Also, the tractor A includes a first hose 6a, a second hose 6b, a water supply portion 6c, and a third hose 6d. The first hose 6a, the second hose 6b, the water supply portion 6c, and the third hose 6d are included in the cooling water path in the tractor A.

[0153] One end portion of the first hose 6a is connected to the radiator 15. The other end portion of the first hose 6a is connected to the water supply portion 6c.

[0154] That is, the tractor A includes the first hose 6a connected to the radiator 15.

[0155] One end portion of the second hose 6b is connected to the water supply portion 6c. The other end portion of the second hose 6b is connected to the voltage converter 19.

[0156] The third hose 6d is connected to the voltage converter 19.

[0157] The operator can supply cooling water to the water supply portion 6c. Also, the cooling water flows in the order of the third hose 6d, the voltage converter 19, the second hose 6b, the water supply portion 6c, the first hose 6a, and the radiator 15.

[0158] As shown in FIGS. 2, 3, and 5, the tractor A includes a support portion 7 and a cover support member 58. The support portion 7 is supported by the radiator frame 57. And the support portion 7 extends upward from the upper part of the radiator frame 57.

[0159] That is, the tractor A includes a support portion 7 extending upward from the upper portion of the radiator frame 57.

[0160] The cover support member 58 is a rod-shaped member. One end portion of the cover support member 58 is connected to the upper end portion of the support portion 7 in a state of being able to swing up and down around a swing axis P along the longitudinal direction of the machine body.

[0161] When the cover support member 58 is swung upward and in a raised state, and the cover member 12 is in an open state, the other end portion of the cover support member 58 can contact the inner wall surface of the cover member 12. And when the other end portion of the cover support member 58 contacts the inner wall surface of the cover member 12, the cover member 12 is supported by the cover support member 58.

[0162] With this configuration, the cover support member 58 can support the cover member 12 in an open state.

[0163] That is, the tractor A includes a cover support member 58 that is connected to the upper end portion of the support portion 7 and can support the cover member 12 in an open state.

[0164] When the cover member 12 is in a closed state, the voltage converter 19, the first hose 6a, the radiator frame 57, the reserve tank 5, and the auxiliary battery 18 are housed in the cover member 12.

[0165] That is, the tractor A includes a cover member 12 that houses the voltage converter 19, the radiator 15, the first hose 6a, and the radiator frame 57 and is openable and closable.

[0166] Further, the support portion 7 has a first portion 71, a second portion 72, and a third portion 73.

[0167] The first portion 71 extends upward from the upper portion of the radiator frame 57. The lower end portion of the first portion 71 is connected to the upper portion of the radiator frame 57.

[0168] Further, the second part 72 extends forward from the middle part in the vertical direction of the aircraft body in the first part 71. The second part 72 is in a horizontal posture.

[0169] And the third part 73 extends downward from the front end of the second part 72 and is connected to the upper part of the radiator frame 57. The third part 73 is in a posture of sloping downward to the front. The rear end of the third part 73 is connected to the front end of the second part 72. Also, the front end of the third part 73 is connected to the upper part of the radiator frame 57.

[0170] That is, the support part 7 has a first part 71 extending upward from the upper part of the radiator frame 57, a second part 72 extending forward from the middle part in the vertical direction of the aircraft body in the first part 71, and a third part 73 extending downward from the front end of the second part 72 and connected to the upper part of the radiator frame 57.

[0171] The first hose 6a is arranged in a state of passing through the area AR surrounded by the first part 71, the second part 72, and the third part 73.

[0172] Here, when the first part 71 is described in detail, the first part 71 has a support stay 71a and a vertical fixing part 71b. The support stay 71a is in the shape of a long plate and extends in the vertical direction of the aircraft body along the left side plate 57a. Also, the lower end of the support stay 71a is bolt-fixed to the rear end of the upper end of the left side plate 57a.

[0173] The vertical fixing part 71b is in the shape of a long plate and extends in the vertical direction of the aircraft body. Incidentally, in the vertical direction of the aircraft body, the length of the vertical fixing part 71b is shorter than the length of the support stay 71a.

[0174] Also, the vertical fixing part 71b is fixed to the left surface of the support stay 71a in a posture perpendicular to the support stay 71a. And the vertical fixing part 71b, the second part 72, and the third part 73 are integrally formed.

[0175] The above-mentioned area AR is surrounded by the support stay 71a, the second part 72, and the third part 73.

[0176] As shown in FIGS. 2 to 5, a support plate SP in a horizontal posture is provided at the front part of the tractor A. The radiator 15, the cooling fan 17, the accessory battery 18, the voltage converter 19, the radiator frame 57, and the oil cooler CL are supported by the support plate SP.

[0177] 〔Configuration regarding the hydraulic pump〕 As shown in FIGS. 1 and 2, the tractor A is equipped with a hydraulic pump 60. The hydraulic pump 60 supplies hydraulic oil to the operating mechanism that operates the tilling device 13. By controlling the supply of the hydraulic oil, the tilling device 13 can be operated.

[0178] More specifically, the tractor A has a lifting mechanism 36 which is an operating mechanism of the working device. The hydraulic pump 60 supplies hydraulic oil to the lifting mechanism 36. Thereby, the lifting mechanism 36 operates. And by the operation of the lifting mechanism 36, the tilling device 13 moves up and down. The drive part of the tilling part 13a of the tilling device 13 is connected to the PTO shaft 37 of the tractor A, and tilling work can be performed by the power thereof.

[0179] As shown in FIGS. 2, 4, and 6, the hydraulic pump 60 is arranged at a position adjacent to the motor M.

[0180] As shown in FIG. 2, the motor M is supported by the front support frame 50 and the rear support frame 59.

[0181] The front support frame 50 is provided in a state spanning the left and right main frames 20. Also, the front support frame 50 is fixed to the lower parts of the left and right main frames 20. Also, the front support frame 50 is located below the front part of the motor M. And the front support frame 50 supports the front part of the motor M.

[0182] The rear support frame 59 is provided in a state spanning the left and right main frames 20. Further, the rear support frame 59 is in contact with the rear end portion of the motor M. And the rear support frame 59 supports the rear portion of the motor M.

[0183] As shown in FIGS. 2 and 6, the hydraulic pump 60 is attached to the rear support frame 59 from the front side. Thereby, the hydraulic pump 60 is supported by the rear support frame 59.

[0184] That is, the motor M and the hydraulic pump 60 are supported by the common rear support frame 59.

[0185] Also, as shown in FIG. 6, a first rotating body 64 is attached to the motor output shaft 61 which is the output shaft of the motor M. The first rotating body 64 rotates integrally with the motor output shaft 61.

[0186] That is, the tractor A includes a first rotating body 64 that is attached to the motor output shaft 61 and rotates integrally with the motor output shaft 61.

[0187] Also, a second rotating body 65 is attached to the pump input shaft 62 which is the input shaft of the hydraulic pump 60. The second rotating body 65 rotates integrally with the pump input shaft 62.

[0188] That is, the tractor A includes a second rotating body 65 that is attached to the pump input shaft 62 which is the input shaft of the hydraulic pump 60 and rotates integrally with the pump input shaft 62.

[0189] And an endless rotating body 66 is wound around the first rotating body 64 and the second rotating body 65.

[0190] That is, the tractor A includes an endless rotating body 66 wound around the first rotating body 64 and the second rotating body 65.

[0191] Still, in the present embodiment, the endless rotating body 66 is a belt. However, the present invention is not limited to this, and the endless rotating body 66 may not be a belt. For example, the endless rotating body 66 may be a chain.

[0192] With the above configuration, the driving force of the motor M is transmitted to the hydraulic pump 60 via the motor output shaft 61, the first rotating body 64, the endless rotating body 66, the second rotating body 65, and the pump input shaft 62. Thereby, the hydraulic pump 60 is driven.

[0193] That is, the tractor A is driven by the motor M and includes a hydraulic pump 60 that supplies hydraulic oil to the tilling device 13.

[0194] Further, a connection part 8 connects between the transmission input shaft 63, which is the input shaft of the transmission device T, and the motor output shaft 61. Thereby, the transmission input shaft 63 rotates integrally with the motor output shaft 61.

[0195] More specifically, as shown in FIG. 7, both the motor output shaft 61 and the transmission input shaft 63 are formed in a cylindrical shape and extend in the longitudinal direction of the machine body. The connection part 8 has a connection shaft 81 and a pin 82.

[0196] The connection shaft 81 extends in the longitudinal direction of the machine body. The front end portion of the connection shaft 81 is inserted into the motor output shaft 61 and is spline-fitted to the motor output shaft 61. The rear end portion of the connection shaft 81 is inserted into the transmission input shaft 63 and is spline-fitted to the transmission input shaft 63.

[0197] A pin hole 63a is formed in the transmission input shaft 63. The pin 82 is inserted into the pin hole 63a. In this state, the pin 82 is located behind the connection shaft 81. The pin 82 prevents the connection shaft 81 from sliding backward.

[0198] In the state shown on the left side of the drawing of FIG. 7, the transmission input shaft 63 and the motor output shaft 61 are non-rotatable relative to each other.

[0199] That is, the tractor A includes a connecting portion 8 that connects between the transmission input shaft 63 and the motor output shaft 61 in a state where the transmission input shaft 63 and the motor output shaft 61 are non-rotatable relative to each other.

[0200] And, as shown in FIG. 7, the connecting portion 8 is configured to be able to change its state between a connected state and a non-connected state. The connected state is a state where the transmission input shaft 63 and the motor output shaft 61 are connected. The non-connected state is a state where the transmission input shaft 63 and the motor output shaft 61 are not connected.

[0201] In the state shown on the left side of the drawing of FIG. 7, the connecting portion 8 is in the connected state. At this time, as described above, the transmission input shaft 63 and the motor output shaft 61 are non-rotatable relative to each other. Therefore, the transmission input shaft 63 rotates integrally with the motor output shaft 61.

[0202] That is, when the connecting portion 8 is in the connected state, the transmission input shaft 63 rotates integrally with the motor output shaft 61.

[0203] Then, by removing the pin 82 from the pin hole 63a and sliding the connecting shaft 81 rearward, the connecting portion 8 becomes the state shown on the right side of the drawing of FIG. 7. In the state shown on the right side of the drawing of FIG. 7, the connecting portion 8 is in the non-connected state.

[0204] At this time, the connecting shaft 81 is separated from the motor output shaft 61. And a gap G is formed between the front end of the connecting shaft 81 and the rear end of the motor output shaft 61.

[0205] The gap G is located between the front end of the transmission input shaft 63 and the rear end of the motor output shaft 61. And the width of the gap G is larger than the width of the endless rotating body 66. Thereby, when the endless rotating body 66 is removed from the first rotating body 64 or the second rotating body 65, the endless rotating body 66 can pass through the gap G.

[0206] That is, when the connecting portion 8 is in a non-connected state, a gap G through which the removed endless rotating body 66 can pass is formed between the front end of the transmission input shaft 63 and the rear end of the motor output shaft 61.

[0207] 〔Configuration of the first rotating body〕 As shown in FIG. 7, the first rotating body 64 has a first divided body 67 and a second divided body 68. The first divided body 67 is located in front of the second divided body 68. And, as shown on the left side of the paper surface of FIG. 7, the front side surface of the second divided body 68 is in contact with the rear side surface of the first divided body 67.

[0208] The first divided body 67 has a winding portion 67a and a flange portion 67b. The winding portion 67a is configured to be able to wind the endless rotating body 66. Also, the flange portion 67b is located at the front end portion of the first divided body 67. And the flange portion 67b protrudes in the radial direction.

[0209] The second divided body 68 is configured in a disk shape. And the second divided body 68 is fixed to the rear end of the winding portion 67a by a plurality of fixing bolts 69. Note that the outer diameter of the second divided body 68 is the same as the outer diameter of the flange portion 67b.

[0210] According to this configuration, as shown on the right side of the paper surface of FIG. 7, the second divided body 68 can be removed by removing the plurality of fixing bolts 69. And in the state where the second divided body 68 is removed, the endless rotating body 66 can be easily removed from the first rotating body 64 by moving the endless rotating body 66 rearward.

[0211] Furthermore, if the connecting portion 8 is in a non-connected state, the operator can easily remove the endless rotating body 66 from the tractor A by removing the endless rotating body 66 from the first rotating body 64 and passing it through the gap G.

[0212] When attaching the endless rotating body 66 to the tractor A, the operator passes the endless rotating body 66 through the gap G, winds it around the winding portion 67a, and then sets it in the state shown on the left side of the paper surface in FIG. 7. Thereby, the endless rotating body 66 can be easily attached to the tractor A.

[0213] 〔Configuration regarding the tension adjustment mechanism〕 As shown in FIG. 8, the tractor A is provided with a tension adjustment mechanism 9. The tension adjustment mechanism 9 has a tension wheel 91, a long linking member 92, and an adjustment portion 93.

[0214] The tension wheel 91 contacts the endless rotating body 66 and applies tension to the endless rotating body 66. Further, the tension wheel 91 is supported by the machine body frame 2 via the linking member 92.

[0215] The adjustment portion 93 is configured to be manually operable. When the adjustment portion 93 is manually operated, the linking member 92 moves in the longitudinal direction of the linking member 92. Then, as the linking member 92 moves, the tension wheel 91 moves in the longitudinal direction of the linking member 92. Thereby, the tension of the endless rotating body 66 changes.

[0216] With the above configuration, the tension adjustment mechanism 9 is configured to be able to adjust the tension of the endless rotating body 66 by manual operation.

[0217] That is, the tractor A is provided with a tension adjustment mechanism 9 that can adjust the tension of the endless rotating body 66 by manual operation.

[0218] Further, as shown in FIGS. 1, 2, and 8, the operation portion 3 has a wall portion 34 and an opening cover member 35.

[0219] The wall portion 34 is provided so as to partition between the driver's seat 31 and the endless rotating body 66 and the tension adjustment mechanism 9. Further, in the wall portion 34, an opening 34a is formed at a position near the tension adjustment mechanism 9. Note that the opening 34a is located near the front end portion of the floor 33.

[0220] The opening cover member 35 is provided in a state of closing the opening 34a. And the opening cover member 35 is configured to be detachable. By removing the opening cover member 35, the opening 34a becomes open. Also, by attaching the opening cover member 35, the opening 34a becomes closed.

[0221] Specifically, the opening cover member 35 is attached to the wall portion 34 by bolts b1. And by removing the bolts b1, the opening cover member 35 can be removed. Note that in FIG. 8, only one bolt b1 is shown, but the number of bolts b1 may be any number of one or more.

[0222] That is, the operation unit 3 has a wall portion 34 that partitions between the driver's seat 31, the endless rotating body 66, and the tension adjusting mechanism 9. Also, the operation unit 3 has an opening cover member 35 that can open and close the opening 34a.

[0223] Note that the present invention is not limited to this, and the opening cover member 35 may be attached to the wall portion 34 without using the bolts b1. For example, a convex portion may be formed on the opening cover member 35, and a concave portion may be formed on the wall portion 34, and the opening cover member 35 may be attached to the wall portion 34 by fitting the convex portion into the concave portion.

[0224] An operator can easily access the adjustment unit 93 through the opening 34a by removing the opening cover member 35.

[0225] According to the configuration described above, the transmission device T is arranged behind the traveling battery 4. Thereby, the traveling battery 4 and the transmission device T are dispersedly arranged in the longitudinal direction of the machine body.

[0226] Thereby, compared with the case where the transmission device T is arranged below the traveling battery 4, the weight balance of the machine body in the longitudinal direction becomes good.

[0227] Moreover, with the configuration described above, the motor M and the inverter 14 are arranged side by side in the longitudinal direction of the vehicle body below the traveling battery 4.

[0228] As a result, the space required to arrange the traveling battery 4, the motor M, and the inverter 14 becomes relatively small in the left - right direction of the vehicle body. Therefore, the width of the vehicle body becomes compact.

[0229] Moreover, with the configuration described above, the motor M is arranged behind the inverter 14. Therefore, there is no need to consider preventing the power transmission structure between the motor M and the transmission device T from interfering with the inverter 14. As a result, the power transmission structure between the motor M and the transmission device T is likely to be simplified.

[0230] That is, with the configuration described above, it is possible to realize a tractor A in which the weight balance of the vehicle body in the front - rear direction is good, the width of the vehicle body is compact, and the power transmission structure between the motor M and the transmission device T is likely to be simplified.

[0231] Note that the above - described embodiments are merely examples, and the present invention is not limited thereto and can be appropriately modified.

[0232] 〔Other Embodiments〕 (1) The number of the first support frames 51 provided may be one or three or more.

[0233] (2) The number of the second support frames 52 provided may be one or three or more.

[0234] (3) The number of the ventilation openings K provided may be one or three or more.

[0235] (4) The number of the discharge portions 12b provided may be one or three or more.

[0236] (5) The cover member 12 is provided with one ventilation port, and this ventilation port may also be used as the introduction part 12a and the discharge part 12b.

[0237] (6) The second part 72 does not have to be in a horizontal posture. For example, the second part 72 may be in a forwardly inclined posture or a forwardly downward inclined posture.

[0238] (7) The third part 73 does not have to be in a forwardly downward inclined posture. For example, the third part 73 may be in a vertical posture or in a posture extending rearward and downward from the front end of the second part 72.

[0239] (8) The connecting shaft 81 may be slidable forward. In this case, a gap G may be formed between the rear end of the connecting shaft 81 and the front end of the transmission input shaft 63.

[0240] (9) It may be configured such that when the connecting shaft 81 slides rearward, the front end of the connecting shaft 81 moves to the rear side of the front end of the transmission input shaft 63. In this case, a gap G may be formed between the rear end of the motor output shaft 61 and the front end of the transmission input shaft 63.

[0241] (10) The second divided body 68 may be fixed to the rear end of the winding part 67a by a single fixing bolt 69.

[0242] (11) The second divided body 68 may be fixed to the rear end of the winding part 67a without using the fixing bolt 69. For example, a convex part may be formed on the first divided body 67 and a concave part may be formed on the second divided body 68, and the second divided body 68 may be fixed to the rear end of the winding part 67a by fitting the convex part into the concave part.

[0243] (12) The outer diameter of the second divided body 68 may be different from the outer diameter of the flange part 67b.

[0244] (13) The motor M does not have to be in contact with the ventilation space S.

[0245] (14) The tractor A may be equipped with an engine and may be configured in a hybrid manner.

[0246] (15) The wind direction plate 56a may not be provided.

[0247] (16) The plate-shaped partition member 56 may not be provided.

[0248] (17) The second space S2 may not be formed between the motor M and the traveling battery 4.

[0249] (18) The second space S2 may not be included in the ventilation space S. That is, the second space S2 and the ventilation space S may be partitioned.

[0250] (19) The first space S1 may not be formed between the inverter 14 and the traveling battery 4.

[0251] (20) The first space S1 may not be included in the ventilation space S. That is, the first space S1 and the ventilation space S may be partitioned.

[0252] (21) The cover member 12 may not be provided.

[0253] (22) Some or all of the traveling battery 4, the reserve tank 5, the first hose 6a, the radiator 15, the cooling fan 17, the auxiliary battery 18, the voltage converter 19, and the radiator frame 57 may not be housed in the cover member 12.

[0254] (23) The discharge part 12b may not be provided.

[0255] (24) The introduction part 12a may not be provided.

[0256] (25) The discharge part 12b may be provided at a position other than the lateral side of the traveling battery 4. For example, the discharge part 12b may be provided at a position behind the traveling battery 4.

[0257] (26) The first plate-like member 54 may not be provided.

[0258] (27) The second plate-like member 55 may not be provided.

[0259] (28) The first plate-like member 54 does not have to be in a horizontal posture. For example, the first plate-like member 54 may be inclined downward forward or downward backward.

[0260] (29) The second plate-like member 55 does not have to be in a horizontal posture. For example, the second plate-like member 55 may be inclined downward forward or downward backward.

[0261] (30) The ventilation space S does not have to communicate with the ventilation opening K.

[0262] (31) The ventilation opening K does not have to be formed.

[0263] (32) The first support frame 51 does not have to be erected on the airframe frame 2.

[0264] (33) The second support frame 52 does not have to be erected on the airframe frame 2.

[0265] (34) The first support frame 51 may not be provided.

[0266] (35) The second support frame 52 may not be provided.

[0267] (36) The first hose 6a may be arranged in a state of not passing through the region AR surrounded by the first part 71, the second part 72, and the third part 73. For example, the first hose 6a may be arranged in a state of passing through the front side of the third part 73.

[0268] (37) The support part 7 does not have to have the second part 72 and the third part 73.

[0269] (38) The cover support member 58 may not be provided.

[0270] (39) The support portion 7 may not be provided.

[0271] (40) Some or all of the first hose 6a, the second hose 6b, the water supply portion 6c, and the third hose 6d may not be provided.

[0272] (41) The voltage converter 19 may be arranged in a state where the longitudinal direction of the voltage converter 19 is along the front - rear direction of the aircraft body, or may be arranged in a state where the longitudinal direction of the voltage converter 19 is along the left - right direction of the aircraft body.

[0273] (42) The voltage converter 19 may not be attached to the radiator frame 57.

[0274] (43) The radiator frame 57 may not be provided.

[0275] (44) The reserve tank 5 and the auxiliary battery 18 may not be arranged in a state of being aligned in the up - down direction of the aircraft body. For example, the reserve tank 5 and the auxiliary battery 18 may be arranged in a state of being aligned in the left - right direction of the aircraft body.

[0276] (45) The radiator 15, the voltage converter 19, and the reserve tank 5 may not be arranged side - by - side in a plan view. For example, the reserve tank 5 may be arranged above the voltage converter 19.

[0277] (46) The radiator 15, the voltage converter 19, and the auxiliary battery 18 may not be arranged side - by - side in a plan view. For example, the auxiliary battery 18 may be arranged above the voltage converter 19.

[0278] (47) The cooling fan 17 may be configured to send cooling air in a direction other than the rear side. For example, the cooling fan 17 may be configured to send cooling air to the front side.

[0279] (48) The cooling fan 17 may be disposed above the inverter 14 or may be disposed below the inverter 14.

[0280] (49) The bottom plate portion 53a may not be provided.

[0281] (50) The inverter support portion 21 may be located on the right side of the left end position of the left main frame 20.

[0282] (51) The inverter support portion 21 may be located on the left side of the right end position of the right main frame 20.

[0283] (52) The inverter support portion 21 may not be provided. In this case, the inverter 14 may be directly supported by the left main frame 20 and the right main frame 20.

[0284] (53) The inverter 14 may be located on the right side of the left end position of the left main frame 20.

[0285] (54) The inverter 14 may be located on the left side of the right end position of the right main frame 20.

[0286] (55) The body frame 2 may not have the left and right main frames 20. For example, the body frame 2 may be composed of a single frame member.

[0287] (56) The water pump 16 may be disposed at a position other than in front of the motor M. For example, the water pump 16 may be disposed behind the motor M.

[0288] (57) The water pump 16 may be disposed above the inverter 14.

[0289] (58) The motor M may be arranged at a position other than the position sandwiched between the left and right main frames 20. For example, the motor M may be arranged above the left and right main frames 20.

[0290] (59) The hydraulic pump 60 does not have to be supported by the rear support frame 59. That is, the motor M and the hydraulic pump 60 do not have to be supported by the common rear support frame 59.

[0291] (60) The opening cover member 35 may be configured such that the opening 34a cannot be opened or closed. For example, the opening cover member 35 may be configured so that it cannot be removed.

[0292] (61) The wall portion 34 does not have to be formed with the opening 34a.

[0293] (62) The wall portion 34 does not have to be provided.

[0294] (63) The opening cover member 35 does not have to be provided.

[0295] (64) The tension adjusting mechanism 9 does not have to be provided.

[0296] (65) The removed endless rotating body 66 does not have to be able to pass through the gap G.

[0297] (66) The connecting portion 8 may be configured so that it cannot be changed from the connected state to the unconnected state.

[0298] (67) The connecting portion 8 does not have to be provided.

[0299] (68) Both the first rotating body 64 and the second rotating body 65 may be gears and may be meshed with each other. In this case, the endless rotating body 66 does not have to be provided.

[0300] (69) The transmission input shaft 63 may not be configured to rotate integrally with the motor output shaft 61. For example, the transmission input shaft 63 and the motor output shaft 61 may be linked via a plurality of gears.

[0301] (70) The transmission device T may be arranged at a position other than the rear of the motor M. For example, the transmission device T may be arranged in front of the motor M.

[0302] (71) Instead of the tilling device 13, various devices such as a fertilizer spreader, a chemical sprayer, a seeding device, a harvesting device, etc., and working devices such as a loader and a shovel may be provided.

[0303] (72) The wind vane 56a does not have to be in a vertical posture. For example, the wind vane 56a may be inclined forward downward or backward downward.

[0304] (73) The cooling fan 17 may be arranged above or below the traveling battery 4, or may be arranged above or below the ventilation space S.

[0305] (74) The ventilation space S does not have to be formed.

[0306] (75) The cooling fan 17 may be arranged at a position other than in front of the traveling battery 4. For example, the cooling fan 17 may be arranged behind the traveling battery 4.

[0307] (76) The traveling battery 4 may be configured not to be cooled by the cooling air from the cooling fan 17.

[0308] (77) The traveling battery 4 may be arranged at a position overlapping with the machine body frame 2 in a side view, or may be arranged below the machine body frame 2.

[0309] (78) The voltage converter 19 and the radiator 15 do not have to be arranged side by side in a plan view. For example, the voltage converter 19 may be arranged above the radiator 15.

[0310] (79) The radiator 15 may be arranged behind the traveling battery 4.

[0311] (80) The voltage converter 19 may be arranged behind the traveling battery 4.

[0312] (81) The voltage converter 19 does not have to be provided.

[0313] (82) The auxiliary battery 18 does not have to be provided.

[0314] (83) The hydraulic pump 60 may be arranged at a position relatively far from the motor M.

[0315] (84) The hydraulic pump 60 may be driven by a power source other than the motor M.

Industrial Applicability

[0316] The present invention can be applied not only to tractors but also to various electric work vehicles such as combines, rice transplanters, and construction work machines.

Explanation of Signs

[0317] 4 Traveling battery (battery) 10 Front wheels (traveling device) 11 Rear wheels (traveling device) 14 Inverter 15 Radiator 16 Water pump 17 Cooling fan 20 Main frame 21 Inverter support part 51 First support frame (battery support frame) 52 Second support frame (battery support frame) 53a bottom plate part (partition plate) A tractor (electric work vehicle) M motor T transmission

Claims

[Claim 1] A battery; a motor driven by power supplied from the battery; front and rear wheels driven by the motor; a transmission device disposed rearward of the battery and rearward of the motor; a front transmission mechanism extending forward from the transmission device, A driving force of the motor is transmitted to the front wheels via the transmission device and the front transmission mechanism, a front axle, which is an axle of the front wheels, is disposed below the battery and within a front-to-rear width of the battery, The motor is disposed rearward of the front axle.

Images