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 that includes a battery, a motor that is driven by power supplied from the battery, and a traveling device that is driven by the motor. [Background technology]

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

[0003] Furthermore, the work vehicle described in Patent Document 1 is equipped with 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] Japanese Patent Application Publication No. 2018-69926 Summary of the Invention [Problem to be solved by the invention]

[0005] It is conceivable to provide a battery and a motor instead of the engine in the work vehicle described in Patent Document 1. This would allow the vehicle to travel without emitting exhaust gases.

[0006] Furthermore, it is conceivable that the work vehicle described in Patent Document 1 could be equipped with an inverter that converts DC power from the battery into AC power and supplies it to the motor, thereby making it possible to supply AC power to the motor.

[0007] Generally, the size of the transmission tends to be relatively large, and therefore the weight of the transmission tends to be relatively large.

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

[0009] However, the larger the storage capacity of a battery, the larger the size of the battery tends to be, and the larger the size of the battery, the heavier the battery becomes.

[0010] Therefore, the weight of the battery tends to be relatively large.

[0011] Depending on the arrangement of the battery, motor, inverter, and transmission, it is possible that the weight balance of the vehicle in the longitudinal direction may be poor, the width of the vehicle may become relatively large, or the power transmission structure between the motor and the transmission may become complicated.

[0012] For example, in a configuration in which the transmission is located below the battery, the weight of the portion of the vehicle where the battery and transmission are located tends to be extremely large in the fore-and-aft direction, which tends to result in poor weight balance of the vehicle in the fore-and-aft direction.

[0013] Furthermore, for example, in a configuration in which the motor is located to the left of the battery and the inverter is located to the right of the battery, the space required to arrange the battery, motor, and inverter tends to be relatively large in the left-right direction of the vehicle, which tends to make the vehicle width relatively large.

[0014] Furthermore, for example, in a configuration in which the motor is disposed forward of the inverter, the inverter is located between the motor and the transmission in the longitudinal direction of the vehicle body. Therefore, it is necessary to take care that the power transmission structure between the motor and the transmission does not interfere with the inverter. This tends to make the power transmission structure between the motor and the transmission complex.

[0015] The object of the present invention is to provide an electric work vehicle that has a good weight balance of the body in the fore-and-aft direction, a compact width of the body, and a simple power transmission structure between the motor and the transmission device. [Means for solving the problem]

[0016] a cover member provided at the front of the aircraft; an aircraft frame extending in the fore-and-aft direction of the aircraft; The electric work vehicle of the present invention comprises a battery, a motor driven by power supplied from the battery, a running device driven by the motor, a transmission device arranged rearward of the battery and behind the motor and transmitting the driving force of the motor to the running device, and a radiator, wherein the motor is arranged below the battery so that at least a portion of it overlaps with the body frame in a side view, and the cover member houses the battery and the radiator. In the above configuration, it is preferable that the radiator is disposed in front of the battery, and that a lower end of the radiator is positioned lower than a lower end of the battery. In addition, in the above configuration, it is preferable that the auxiliary battery, a voltage converter that reduces the voltage of the power from the battery and supplies it to the auxiliary battery, and the radiator are arranged side by side in the width direction of the aircraft in front of the battery. In the above configuration, it is preferable that an inverter is provided below the battery and in front of the motor, and that a front end of the inverter is located rearward of a front end of the battery. In addition, the present invention electric work vehicle The vehicle comprises a battery, a motor arranged below the battery and driven by power supplied from the battery, a traveling device driven by the motor, an inverter arranged below the battery and forward of the motor, converting DC power from the battery into AC power and supplying it to the motor, and a transmission device arranged rearward of the battery, transmitting the driving force of the motor to the traveling device, the motor and the inverter being arranged side by side in the fore-and-aft direction of the vehicle body.

[0017] According to the present invention, the transmission device is disposed rearward of the battery, so that the battery and the transmission device are disposed separately in the longitudinal direction of the vehicle body.

[0018] This improves the weight balance of the vehicle in the longitudinal direction compared to when the transmission device is disposed below the battery.

[0019] Furthermore, according to the present invention, the motor and the inverter are arranged below the battery and aligned in the fore-and-aft direction of the vehicle body.

[0020] This reduces the space required to arrange the battery, motor, and inverter in the left-right direction of the vehicle, thereby making the vehicle's width more compact.

[0021] Furthermore, with the present invention, the motor is positioned behind the inverter, eliminating the need to ensure that the power transmission structure between the motor and the transmission does not interfere with the inverter, which makes it easier to simplify the power transmission structure between the motor and the transmission.

[0022] In other words, the present invention makes it possible to realize an electric work vehicle that has a good weight balance of the vehicle body in the fore-and-aft direction, a compact width of the vehicle body, and a simple power transmission structure between the motor and the transmission device.

[0023] Furthermore, in the present invention, it is preferable that the vehicle has left and right main frames extending in the fore-and-aft direction of the aircraft, the inverter is supported by the left and right main frames, and the motor is positioned so as to be 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] Furthermore, with this configuration, the motors are positioned lower than when they are positioned above the left and right main frames, which lowers the center of gravity of the aircraft, improving the aircraft's attitude stability.

[0026] Furthermore, with this configuration, the motor is protected by the left and right main frames, which means there is no need to provide a dedicated member to protect the motor, which tends to reduce manufacturing costs compared to when a dedicated member is provided to protect the motor.

[0027] Furthermore, in the present invention, it is preferable that the vehicle further comprises a radiator and a water pump that pumps cooling water passing through the radiator, the water pump being disposed in front of the motor and below the inverter.

[0028] According to this configuration, when the motor is disposed in a position sandwiched between the left and right main frames, the water pump is also disposed in a position sandwiched between the left and right main frames. Therefore, the water pump is protected by the left and right main frames. This eliminates the need for a dedicated member to protect the water pump. This tends to result in lower manufacturing costs compared to when a dedicated member is provided to protect the water pump.

[0029] Moreover, with this configuration, the water pump is disposed below the inverter, which makes it easy to arrange the inverter and the water pump so that they overlap each other in a plan view.

[0030] Furthermore, if the inverter and water pump are positioned so that they overlap each other in a plan view, the space required to position the inverter and water pump tends to be smaller in the fore-and-aft direction of the vehicle compared to when the water pump is positioned in front of or behind the inverter.

[0031] Therefore, this configuration makes it easier for the aircraft to be compact in the longitudinal direction.

[0032] Furthermore, in the present invention, it is preferable that the vehicle comprises a left main frame and a right main frame extending in the fore-and-aft direction of the aircraft, the inverter is supported by the left main frame and the right main frame, and the inverter protrudes to the left of the left end position of the left main frame and protrudes to the right of the right end position of the right main frame.

[0033] With this configuration, the inverter can be shorter in the vertical direction than if it were configured to fit between the left end of the left main frame and the right end of the right main frame, which tends to reduce the space required to install the inverter in the vertical direction of the aircraft body.

[0034] Therefore, this configuration makes it easier for the aircraft to be compact in the vertical direction.

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

[0036] With this configuration, the left and right battery support frames can be arranged so that the distance between them is wider than the distance between the left and right main frames, which provides more stable support for the battery than when 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. This eliminates the need to provide a dedicated member for protecting the inverter, which tends to reduce manufacturing costs compared to when a dedicated member is provided for protecting the inverter.

[0038] Furthermore, in the present invention, it is preferable to provide a partition plate separating the battery and the inverter.

[0039] With this configuration, heat generated by the battery is less likely to be transferred to the inverter, which makes it easier to prevent the inverter from becoming too hot due to heat generated by the battery.

[0040] Furthermore, in the present invention, it is preferable that the vehicle is provided with a radiator located forward of the battery, and a cooling fan that cools the radiator and is located forward of the battery, and that the cooling fan sends cooling air to the rear and is positioned so as to straddle the battery and the inverter in the vertical direction of the vehicle body.

[0041] With this configuration, the cooling air from the cooling fan flows across the battery and the inverter in the vertical direction of the aircraft, i.e., part of the cooling air from the cooling fan flows toward the battery and another part flows toward the inverter.

[0042] The cooling air directed toward the battery cools the battery, and the cooling air directed toward the inverter cools the inverter.

[0043] Therefore, with this configuration, the battery and the inverter can be cooled by the cooling air from the cooling fan. [Brief explanation of the drawings]

[0044] [Figure 1] FIG. [Figure 2] FIG. 2 is a right side view showing the configuration of the driving battery and its surroundings. [Figure 3] FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 2. [Figure 4] FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. 2. [Figure 5] FIG. 2 is a perspective view showing the configuration of the radiator and its surroundings. [Figure 6] FIG. 2 is a plan view showing the configuration of a motor and the like. [Figure 7] 10A and 10B are diagrams showing the configuration of a connecting portion and the like. [Figure 8] FIG. 10 is a diagram showing the configuration around the opening. DETAILED DESCRIPTION OF THE INVENTION

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

[0046] [Overall configuration of the tractor] As shown in Figure 1, tractor A (corresponding to the "electric work vehicle" of the present invention) is equipped with left and right front wheels 10 (corresponding to the "traveling device" of the present invention), left and right rear wheels 11 (corresponding to the "traveling device" of the present invention), a cover member 12, and a tilling device 13.

[0047] The tractor A also includes a machine frame 2 and a driving section 3.

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

[0049] The cover member 12 is disposed at the front of the machine body, and the driving section 3 is disposed behind the cover member 12.

[0050] The driver's section 3 has a protective frame 30, a driver's seat 31, a steering wheel 32, and a floor 33. An operator can sit in the driver's seat 31. The operator can then perform various driving operations in the driver's section 3.

[0051] The left and right front wheels 10 are steered by operating the steering wheel 32. The operator can place his / her feet on the floor 33 while seated in the driver's seat 31.

[0052] That is, the tractor A is provided with a driver's section 3 having a driver's seat 31 on which an operator can sit.

[0053] The tractor A also includes a driving 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 about an opening / closing axis Q (see FIG. 2) that extends in the left-right direction of the vehicle body. This allows the cover member 12 to be opened and closed. When the cover member 12 is in the closed state, the driving battery 4 is housed in the cover member 12. The driving battery 4 supplies power to the motor M.

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

[0056] The transmission device T is disposed rearward of the driving battery 4 and rearward of the motor M. The front transmission mechanism FT extends forward from the transmission device T. The transmission device T changes the speed of the driving force received from the motor M and transmits it to the left and right rear wheels 11. The driving force is also transmitted from the transmission device T to the left and right front wheels 10 via the front transmission mechanism FT. As a result, the left and right front wheels 10 and the left and right rear wheels 11 are driven.

[0057] That is, the tractor A is disposed below the driving battery 4 and is equipped with a motor M that is driven by power supplied from the driving battery 4. The tractor A also has left and right front wheels 10 and left and right rear wheels 11 that are driven by the motor M.

[0058] In this way, the tractor A is disposed rearward of the traction 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] Furthermore, the transmission device T transmits a portion of the driving force received from the motor M to the tillage implement 13. In this way, the tillage implement 13 is driven.

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

[0061] [Layout of driving battery, motor, and inverter] 2 to 4, the driving battery 4 is disposed above the vehicle frame 2. A ventilation space S is formed between the vehicle frame 2 and the driving battery 4.

[0062] That is, the tractor A is provided with a battery 4 for driving that is arranged above the machine frame 2.

[0063] The ventilation space S is a space configured to allow ventilation.

[0064] The tractor A also includes an inverter 14. The inverter 14 is disposed below the traction battery 4. The inverter 14 is also disposed forward of the motor M.

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

[0066] That is, the tractor A is provided with an inverter 14 that is disposed below the driving battery 4 and in front of the motor M, and that converts DC power from the driving battery 4 into AC power and supplies it to the motor M.

[0067] The motor M and the inverter 14 are arranged side by side in the fore-and-aft direction of the vehicle body.

[0068] Further, a first space S1 is formed between the inverter 14 and the driving battery 4. The first space S1 is included in the ventilation space S. That is, the first space S1 is a space configured to allow ventilation.

[0069] Further, a second space S2 is formed between the motor M and the driving battery 4. The second space S2 is included in the ventilation space S. That is, the second space S2 is a space configured to allow ventilation.

[0070] The motor M is disposed 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 machine body frame 2 also has left and right main frames 20 and an inverter support portion 21. The left and right main frames 20 extend in the fore-and-aft direction of the machine body.

[0073] That is, the tractor A has a left main frame 20 and a right main frame 20 that extend in the fore-and-aft direction of the vehicle body.

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

[0075] The inverter support portion 21 is provided across the left and right main frames 20. The inverter support portion 21 is supported by the left and right main frames 20. 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] 3 shows a first left end position LE1, a second left end position LE2, and a third left end position LE3. 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 part 21.

[0078] 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 leftward from the left end position of the left main frame 20.

[0079] 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 leftward beyond the left end position of the left main frame 20.

[0080] 3 also shows a first right end position RE1, a second right end position RE2, and a third right end position RE3. 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 part 21.

[0081] 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 from the right end position of the right main frame 20.

[0082] 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 rightward beyond the right end position of the right main frame 20.

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

[0084] Moreover, the inverter support portion 21 protrudes leftward beyond the left end position of the left main frame 20 and protrudes rightward beyond the right end position of the right main frame 20 .

[0085] As shown in Figures 2 to 4, tractor A has left and right first support frames 51 (corresponding to the "battery support frames" of the present invention), left and right second support frames 52 (corresponding to the "battery support frames" of the present invention), and a battery support section 53.

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

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

[0088] In addition, a plate-shaped support portion 38 and a plate-shaped partition member 56 (described later) are provided between the motor M and the driving battery 4. Both the plate-shaped support portion 38 and the plate-shaped partition member 56 are in a horizontal position. In addition, the plate-shaped partition member 56 is located above the plate-shaped support portion 38.

[0089] The rear support frame 59 is supported by the vehicle frame 2. The rear support frame 59 supports the rear end of the battery support part 53 via the plate-shaped support part 38 and the plate-shaped partition member 56.

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

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

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

[0093] That is, the driving battery 4 is supported by the inverter support part 21 via left and right first support frames 51 that are erected on the inverter support part 21. The driving battery 4 is also supported by the inverter support part 21 via left and right second support frames 52 that are erected on the inverter support part 21.

[0094] Furthermore, 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] The left and right ventilation openings K communicate with the ventilation space S, respectively.

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

[0098] 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 position. The bottom plate portion 53a separates the driving battery 4 and the inverter 14.

[0099] That is, the tractor A has a bottom plate portion 53a that separates the driving battery 4 and the inverter 14.

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

[0101] The first plate-shaped member 54 and the second plate-shaped member 55 are provided so as to span the left and right main frames 20, respectively. The first plate-shaped member 54 is located in front of the second plate-shaped member 55. The first plate-shaped member 54 and the second plate-shaped member 55 are both supported by the left and right main frames 20.

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

[0103] The first plate-shaped member 54 and the second plate-shaped member 55 are both disposed below the ventilation space S in a horizontal position.

[0104] [Configuration of cover member] 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 this embodiment, the introduction section 12a is configured with a plurality of small holes. However, the present invention is not limited to this, and the introduction section 12a may have any other form. For example, the introduction section 12a may be configured with a single hole. Furthermore, the introduction section 12a may include a blower for introducing outside air.

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

[0107] That is, the cover member 12 has left and right exhaust portions 12b that can exhaust air inside the cover member 12 to the outside.

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

[0109] The left discharge portion 12b is located to the left of the driving battery 4. The right discharge portion 12b is located to the right of the driving battery 4. In other words, the left and right discharge portions 12b are located on either side of the driving battery 4.

[0110] In this embodiment, the left and right discharge portions 12b are each configured with a plurality of small holes. However, the present invention is not limited to this, and the left and right discharge portions 12b may have any other configuration. For example, the left and right discharge portions 12b may each be configured with a single hole. Furthermore, the left and right discharge portions 12b may each include a blower for discharging air.

[0111] [Water pump, radiator, and fan layout] 2 to 4, the tractor A is equipped with a radiator 15 and a water pump 16. The radiator 15 is disposed in front of the traction battery 4.

[0112] That is, the tractor A is provided with a radiator 15 located in front of the traction battery 4.

[0113] The radiator 15 and the water pump 16 are included in the cooling water path of the tractor A. The water pump 16 pumps the cooling water, causing the cooling water to circulate through this cooling water path. The cooling water is cooled as it passes through the radiator 15.

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

[0115] The water pump 16 is disposed in front of the motor M and below the inverter 14. The water pump 16 is supported by a first plate-shaped member .

[0116] The tractor A is also equipped with a cooling fan 17. The cooling fan 17 is disposed in front of the driving battery 4. In other words, the cooling fan 17 is located further forward than the driving 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 a cooling fan 17 and a driving battery 4.

[0119] The cooling fan 17 is arranged so as to straddle the driving battery 4 and the ventilation space S in the vertical direction of the vehicle body. The cooling fan 17 is also arranged so as to straddle the driving battery 4 and the inverter 14 in the vertical direction of the vehicle body.

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

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

[0122] In addition, cooling air is sent to the front of the driving battery 4 and the ventilation space S by the cooling fan 17.

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

[0124] At least a portion of the cooling air sent from the cooling fan 17 to the front of the driving battery 4 flows around to the left and right of the driving battery 4 and is discharged from the left and right discharge portions 12b. This cools the front and side portions of the driving battery 4.

[0125] A portion of the cooling air sent from the cooling fan 17 to the ventilation space S reaches the first space S1, passes through the left and right ventilation openings K and the left and right exhaust portions 12b, and is exhausted to the outside of the cover member 12.

[0126] As a result, the lower part of the driving battery 4 and the inverter 14 are cooled.

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

[0128] As a result, the lower part of the driving battery 4, the inverter 14, and the motor M are cooled.

[0129] [Configuration of wind direction vane] As shown in FIG. 2, a plate-shaped partition member 56 is provided between the battery support portion 53 and the motor M in a horizontal position.

[0130] The plate-shaped partition member 56 has an airflow direction flap 56a. The airflow direction flap 56a is formed by bending the front end of the plate-shaped partition member 56 downward. Therefore, the airflow direction flap 56a is in a vertical position. As a result, the airflow direction flap 56a faces the cooling fan 17.

[0131] That is, the tractor A is provided with an air deflector 56a that is oriented to face the cooling fan 17.

[0132] The wind direction plate 56a is disposed below the driving battery 4 and in front of the second space S2.

[0133] As a result, of the cooling air flowing through the ventilation space S, the cooling air flowing toward the second space S2 is guided by the airflow direction plate 56a downward from the airflow direction plate 56a. This makes it easier for the cooling air to flow toward the motor M. As a result, the motor M is well cooled by the cooling air.

[0134] [Location of auxiliary battery, voltage converter, etc.] As shown in Figures 3 to 5, the tractor A is equipped with a reserve tank 5 for the radiator 15. The reserve tank 5 is capable of storing cooling water. The reserve tank 5 is disposed in front of the driving battery 4 and to the right of the radiator 15.

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

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

[0137] That is, the tractor A is provided with a voltage converter 19 which is disposed in front of the driving battery 4 and which reduces the voltage of the power from the driving battery 4 and supplies the power to the auxiliary battery 18.

[0138] The auxiliary battery 18 and the voltage converter 19 are disposed in front of the driving battery 4 and to the right of the radiator 15. The voltage converter 19 is disposed with its longitudinal direction aligned with the vertical direction of the vehicle body.

[0139] 3, voltage converter 19 and radiator 15 are arranged side by side in a plan view. Radiator 15, voltage converter 19, and auxiliary battery 18 are also arranged side by side in a plan view.

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

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

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

[0143] 3 and 4, the reserve tank 5 is disposed above the auxiliary battery 18. The reserve tank 5 and the auxiliary battery 18 are disposed side by side in the vertical direction of the aircraft body.

[0144] 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 of the radiator frame] 2, 3, and 5, the radiator 15 is supported by a gate-shaped radiator frame 57. The radiator frame 57 is disposed so as to surround the radiator 15.

[0146] That is, the tractor A is provided with a gate-shaped radiator frame 57 that is disposed so as to surround the radiator 15 and 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 on the left side of the radiator frame 57. The top plate 57b is located on the top of the radiator frame 57. The right side plate 57c is located on the right side of the radiator frame 57.

[0149] The left and right plates 57a and 57c are arranged in a vertical position and are aligned side by side, and are opposed to each other.

[0150] The first tabletop support portion 57d extends leftward from the upper end of the left side plate 57a. The second tabletop support portion 57e extends rightward from the upper end of the right side plate 57c. The tabletop 57b is supported on the upper surfaces of the first tabletop support portion 57d and the second tabletop support portion 57e.

[0151] 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] Tractor A also includes a first hose 6a, a second hose 6b, a water supply unit 6c, and a third hose 6d. First hose 6a, second hose 6b, water supply unit 6c, and third hose 6d are included in the cooling water path of tractor A.

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

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

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

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

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

[0158] 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 a radiator frame 57. The support portion 7 extends upward from the upper portion of the radiator frame 57.

[0159] That is, the tractor A is provided with a support portion 7 that extends upward from the top of the radiator frame 57.

[0160] The cover support member 58 is a rod-shaped member, and one end of the cover support member 58 is connected to the upper end of the support part 7 in a state in which it can swing up and down around a swing axis P along the fore-and-aft direction of the aircraft body.

[0161] When the cover support member 58 is swung upward and in an upright position, and the cover member 12 is in an open position, the other end of the cover support member 58 can abut against the inner wall surface of the cover member 12. When the other end of the cover support member 58 abuts against 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 the open state.

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

[0164] When the cover member 12 is in the 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 within the cover member 12.

[0165] That is, the tractor A houses the voltage converter 19, the radiator 15, the first hose 6a, and the radiator frame 57, and is provided with a cover member 12 that can be opened and closed.

[0166] The support portion 7 also 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 of the first portion 71 is connected to the upper portion of the radiator frame 57.

[0168] The second portion 72 extends forward from the middle portion of the first portion 71 in the vertical direction of the aircraft. The second portion 72 is in a horizontal position.

[0169] The third portion 73 extends downward from the front end of the second portion 72 and is connected to the upper portion of the radiator frame 57. The third portion 73 is oriented with its front portion tilted downward. The rear end of the third portion 73 is connected to the front end of the second portion 72. The front end of the third portion 73 is connected to the upper portion of the radiator frame 57.

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

[0171] The first hose 6a is disposed so as to pass through an area AR surrounded by the first portion 71, the second portion 72, and the third portion 73.

[0172] Describing the first portion 71 in detail, the first portion 71 includes a support stay 71a and a vertical fixing portion 71b. The support stay 71a is a long plate that extends in the vertical direction of the vehicle body along the left side plate 57a. The lower end of the support stay 71a is fixed with a bolt to the rear end of the upper end of the left side plate 57a.

[0173] The vertical fixing portion 71b is a long plate-like member that extends in the vertical direction of the aircraft body, and the length of the vertical fixing portion 71b in the vertical direction of the aircraft body is shorter than the length of the support stay 71a.

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

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

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

[0177] [Configuration related to hydraulic pump] As shown in Figures 1 and 2, the tractor A is equipped with a hydraulic pump 60. The hydraulic pump 60 supplies hydraulic oil to an operating mechanism that operates the tillage implement 13. The tillage implement 13 can be operated by controlling the supply of hydraulic oil.

[0178] More specifically, the tractor A has a lifting mechanism 36, which is an operating mechanism for the working implement. A hydraulic pump 60 supplies hydraulic oil to the lifting mechanism 36, which operates the lifting mechanism 36. The operation of the lifting mechanism 36 then raises and lowers the tilling implement 13. The drive section of the tilling unit 13a of the tilling implement 13 is connected to a PTO shaft 37 of the tractor A, and tilling work can be performed using the power from that shaft.

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

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

[0181] The front support frame 50 is provided across the left and right main frames 20. The front support frame 50 is fixed to the lower parts of the left and right main frames 20. The front support frame 50 is located below the front part of the motor M. The front support frame 50 supports the front part of the motor M.

[0182] The rear support frame 59 is provided across the left and right main frames 20. The rear support frame 59 is in contact with the rear end of the motor M. The rear support frame 59 supports the rear of the motor M.

[0183] 2 and 6, the hydraulic pump 60 is attached to the rear support frame 59 from the front side. In this way, 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 a common rear support frame 59 .

[0185] 6, a first rotor 64 is attached to a motor output shaft 61, which is the output shaft of the motor M. The first rotor 64 rotates together with the motor output shaft 61.

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

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

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

[0189] 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 a first rotating body 64 and a second rotating body 65.

[0191] In this embodiment, the endless rotating body 66 is a belt. However, the present invention is not limited to this, and the endless rotating body 66 does not have to 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 rotor 64, the endless rotor 66, the second rotor 65, and the pump input shaft 62. This drives the hydraulic pump 60.

[0193] That is, the tractor A is equipped with a hydraulic pump 60 that is driven by a motor M and supplies hydraulic oil to the tiller implement 13.

[0194] Furthermore, a transmission input shaft 63, which is the input shaft of the transmission device T, and the motor output shaft 61 are connected by a connecting portion 8. As a result, the transmission input shaft 63 and the motor output shaft 61 rotate integrally.

[0195] 7, the motor output shaft 61 and the transmission input shaft 63 are both formed in a cylindrical shape and extend in the fore-and-aft direction of the vehicle body. The connecting portion 8 has a connecting shaft 81 and a pin 82.

[0196] The connecting shaft 81 extends in the fore-and-aft direction of the vehicle body. The front end of the connecting shaft 81 is inserted into the motor output shaft 61 and is spline-fitted to the motor output shaft 61. The rear end of the connecting 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. A pin 82 is inserted into the pin hole 63a. In this state, the pin 82 is located behind the connecting shaft 81. The pin 82 prevents the connecting shaft 81 from sliding rearward.

[0198] In the state shown on the left side of FIG. 7, the transmission input shaft 63 and the motor output shaft 61 cannot rotate relative to each other.

[0199] That is, the tractor A is provided with a connecting portion 8 that connects 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 cannot rotate relative to each other.

[0200] 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 in which the transmission input shaft 63 and the motor output shaft 61 are connected. The non-connected state is a state in which the transmission input shaft 63 and the motor output shaft 61 are not connected.

[0201] 7, the coupling portion 8 is in a coupled state. As described above, the transmission input shaft 63 and the motor output shaft 61 cannot rotate 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 a 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 part 8 becomes the state shown on the right side of Fig. 7. In the state shown on the right side of Fig. 7, the connecting part 8 is in a non-connected state.

[0204] At this time, the connecting shaft 81 is spaced apart from the motor output shaft 61. 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. The width of the gap G is larger than the width of the endless rotating body 66. This allows the endless rotating body 66 to pass through the gap G when it is detached from the first rotating body 64 or the second rotating body 65.

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

[0207] [Configuration of the first rotating body] As shown in Fig. 7, the first rotor 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. As shown on the left side of Fig. 7, the front side of the second divided body 68 is in contact with the rear side 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. The flange portion 67b is located at the front end of the first divided body 67. The flange portion 67b protrudes in the radial direction.

[0209] The second divided body 68 is formed in a disk shape and is fixed to the rear end of the winding portion 67a by a plurality of fixing bolts 69. 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 Figure 7, the second divided body 68 can be removed by removing the multiple fixing bolts 69. Then, with the second divided body 68 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, when the connecting portion 8 is in a disconnected state, the worker 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] Furthermore, when attaching the endless rotating body 66 to the tractor A, the worker passes the endless rotating body 66 through the gap G, winds it around the winding portion 67a, and then places it in the state shown on the left side of the paper in Figure 7. This makes it possible to easily attach the endless rotating body 66 to the tractor A.

[0213] [Configuration of tension adjustment mechanism] 8, the tractor A is provided with a tension adjustment mechanism 9. The tension adjustment mechanism 9 has a tension ring 91, a long connecting member 92, and an adjustment part 93.

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

[0215] The adjustment unit 93 is configured to be manually operable. When the adjustment unit 93 is manually operated, the linking member 92 moves in the longitudinal direction of the linking member 92. As the linking member 92 moves, the tension ring 91 moves in the longitudinal direction of the linking member 92. This changes the tension of the endless rotating body 66.

[0216] With the above-described configuration, the tension adjusting mechanism 9 is configured so that the tension of the endless rotating body 66 can be adjusted by manual operation.

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

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

[0219] The wall portion 34 is provided to separate the driver's seat 31 from the endless rotating body 66 and the tension adjustment mechanism 9. An opening 34a is formed in the wall portion 34 near the tension adjustment mechanism 9. The opening 34a is located near the front end of the floor 33.

[0220] The opening cover member 35 is provided in a state in which it covers the opening 34a. The opening cover member 35 is configured to be detachable. By removing the opening cover member 35, the opening 34a is in an open state. By attaching the opening cover member 35, the opening 34a is in a closed state.

[0221] More specifically, the opening cover member 35 is attached to the wall portion 34 by a bolt b1. The opening cover member 35 can be removed by removing the bolt b1. Although only one bolt b1 is shown in Fig. 8, the number of bolts b1 may be any number greater than or equal to one.

[0222] That is, the driver's section 3 has a wall section 34 that separates the driver's seat 31 from the endless rotating body 66 and the tension adjustment mechanism 9. The driver's section 3 also has an opening cover member 35 that can open and close the opening 34a.

[0223] It should be noted 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] By removing the opening cover member 35, the operator can easily access the adjustment portion 93 through the opening 34a.

[0225] According to the configuration described above, the transmission device T is disposed rearward of the driving battery 4. As a result, the driving battery 4 and the transmission device T are disposed separately in the fore-and-aft direction of the vehicle body.

[0226] This improves the weight balance of the vehicle in the front-to-rear direction compared to when the transmission device T is disposed below the driving battery 4.

[0227] Furthermore, in the configuration described above, the motor M and the inverter 14 are arranged below the driving battery 4, side by side in the fore-and-aft direction of the vehicle body.

[0228] This makes it possible to reduce the space required in the left-right direction of the vehicle body to accommodate the driving battery 4, the motor M, and the inverter 14. This reduces the width of the vehicle body.

[0229] Moreover, with the configuration described above, the motor M is disposed behind the inverter 14. Therefore, there is no need to take care to ensure that the power transmission structure between the motor M and the transmission device T does not interfere with the inverter 14. This makes it easy to simplify the power transmission structure between the motor M and the transmission device T.

[0230] In other words, with the configuration described above, a tractor A can be realized that has a good weight balance of the body in the fore-and-aft direction, a compact width of the body, and a simple power transmission structure between the motor M and the transmission device T.

[0231] The embodiment described above is merely an example, and the present invention is not limited to this, and can be modified as appropriate.

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

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

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

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

[0236] (5) One ventilation hole may be provided in the cover member 12, and this ventilation hole may be used as both the inlet 12a and the outlet 12b.

[0237] (6) The second portion 72 does not have to be in a horizontal position. For example, the second portion 72 may be in a position with its front raised or lowered.

[0238] (7) The third portion 73 does not have to be tilted downward toward the front. For example, the third portion 73 may be vertical or may extend downward and rearward from the front end of the second portion 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) The connecting shaft 81 may be configured to slide rearward, so that the front end of the connecting shaft 81 moves rearward relative to 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 wound portion 67a by a single fixing bolt 69.

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

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

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

[0245] (14) Tractor A may be equipped with an engine and configured as a hybrid.

[0246] (15) The wind deflector 56a does not have to be provided.

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

[0248] (17) The second space S2 does not have to be formed between the motor M and the driving battery 4.

[0249] (18) The second space S2 does not have to be included in the ventilation space S. That is, the second space S2 and the ventilation space S may be separated from each other.

[0250] (19) The first space S1 does not have to be formed between the inverter 14 and the driving battery 4.

[0251] (20) The first space S1 does not have to be included in the ventilation space S. That is, the first space S1 and the ventilation space S may be separated from each other.

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

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

[0254] (23) The discharge section 12b does not have to be provided.

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

[0256] (25) The discharge portion 12b may be provided in a position other than to the side of the driving battery 4. For example, the discharge portion 12b may be provided in a position behind the driving battery 4.

[0257] (26) The first plate-shaped member 54 does not have to be provided.

[0258] (27) The second plate-shaped member 55 does not have to be provided.

[0259] (28) The first plate-shaped member 54 does not have to be in a horizontal position. For example, the first plate-shaped member 54 may be inclined downward toward the front or rear.

[0260] (29) The second plate-shaped member 55 does not have to be in a horizontal position. For example, the second plate-shaped member 55 may be inclined downward toward the front or rear.

[0261] (30) The ventilation space S does not have to be in communication 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 body frame 2.

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

[0265] (34) The first support frame 51 does not have to be provided.

[0266] (35) The second support frame 52 does not have to be provided.

[0267] (36) The first hose 6a may be arranged so as not to pass through the area AR surrounded by the first portion 71, the second portion 72, and the third portion 73. For example, the first hose 6a may be arranged so as to pass in front of the third portion 73.

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

[0269] (38) The cover support member 58 does not have to 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 unit 6c, and the third hose 6d may not be provided.

[0272] (41) The voltage converter 19 may be arranged with its longitudinal direction aligned along the fore-and-aft direction of the aircraft, or may be arranged with its longitudinal direction aligned along the left-and-right direction of the aircraft.

[0273] (42) The voltage converter 19 does not have to 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 do not have to be arranged side by side in the vertical direction of the aircraft. For example, the reserve tank 5 and the auxiliary battery 18 may be arranged side by side in the horizontal direction of the aircraft.

[0276] (45) Radiator 15, voltage converter 19, and reserve tank 5 do not have to be arranged side by side in a plan view. For example, reserve tank 5 may be arranged above voltage converter 19.

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

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

[0279] (48) The cooling fan 17 may be disposed above the inverter 14 or 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 to the right of the left end of the left main frame 20.

[0282] (51) The inverter support portion 21 may be located to the left 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 supported directly by the left main frame 20 and the right main frame 20.

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

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

[0286] (55) The aircraft frame 2 does not have to have left and right main frames 20. For example, the aircraft 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 disposed at a position other than between the left and right main frames 20. For example, the motor M may be disposed 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. In other words, the motor M and the hydraulic pump 60 do not have to be supported by a common rear support frame 59.

[0291] (60) The opening cover member 35 may be configured so 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 necessarily have to have the opening 34a formed therein.

[0293] (62) The wall portion 34 may not be provided.

[0294] (63) The opening cover member 35 may not be provided.

[0295] (64) The tension adjusting mechanism 9 may not be provided.

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

[0297] (66) The connecting portion 8 may be configured so that it cannot change its state from a connected state to a non-connected state.

[0298] (67) The connecting portion 8 may not be provided.

[0299] (68) The first rotor 64 and the second rotor 65 may both be gears and may mesh with each other. In this case, the endless rotor 66 may not be provided.

[0300] (69) The transmission input shaft 63 may not rotate integrally with the motor output shaft 61. For example, the transmission input shaft 63 and the motor output shaft 61 may be connected via multiple gears.

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

[0302] (71) Instead of the tilling implement 13, various other implements such as a fertilizer spreading implement, a chemical spreading implement, a seeding implement, a harvesting implement, etc., or work implements such as a loader, a shovel, etc. may be provided.

[0303] (72) The airflow direction vane 56a does not have to be in a vertical position. For example, the airflow direction vane 56a may be inclined downward toward the front or rear.

[0304] (73) The cooling fan 17 may be disposed above or below the driving battery 4, or 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 disposed in a position other than in front of the driving battery 4. For example, the cooling fan 17 may be disposed behind the driving battery 4.

[0307] (76) The driving battery 4 may be configured so that the cooling air from the cooling fan 17 does not cool the driving battery 4.

[0308] (77) The driving battery 4 may be disposed in a position overlapping the vehicle frame 2 in a side view, or may be disposed below the vehicle frame 2.

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

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

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

[0312] (81) The voltage converter 19 may not be provided.

[0313] (82) The auxiliary battery 18 may not be provided.

[0314] (83) The hydraulic pump 60 may be located relatively far away 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 used not only in tractors but also in various electric work vehicles such as combine harvesters, rice transplanters, and construction machines. [Explanation of symbols]

[0317] 4. Driving battery (battery) 10 Front wheels (running gear) 11 Rear wheels (running gear) 14 Inverter 15 Radiator 16 Water pump 17 Cooling fan 20 Main Frame 21 Inverter support 51 First support frame (battery support frame) 52 Second support frame (battery support frame) 53a Bottom plate (partition plate) A Tractor (electric work vehicle) Medium motor T Transmission

Claims

1. A cover member provided at the front of the aircraft; an aircraft frame extending in the fore-and-aft direction of the aircraft; A battery, a motor driven by power supplied from the battery; a traveling device driven by the motor; a transmission device that is disposed rearward of the battery and rearward of the motor and that transmits driving force of the motor to the traveling device; a radiator; the motor is disposed below the battery so that at least a portion of the motor overlaps with the vehicle frame in a side view; The cover member houses the battery and the radiator.

2. An electric work vehicle as described in claim 1, wherein the radiator is positioned in front of the battery and the lower end of the radiator is positioned lower than the lower end of the battery.

3. An electric work vehicle as described in claim 1, in which an auxiliary battery, a voltage converter that reduces the voltage of the power from the battery and supplies it to the auxiliary battery, and the radiator are arranged side by side in the width direction of the vehicle in front of the battery.

4. An electric work vehicle as described in any one of claims 1 to 3, wherein an inverter is provided in front of the motor below the battery, and the front end of the inverter is located rearward of the front end of the battery.

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