Electric work vehicles

Abstract

The electric working vehicle comprises: a running battery (4), an auxiliary machine battery (18), a motor driven by electric power supplied from the running battery (4), a running device driven by the motor, a voltage converter (19) arranged in front of the running battery (4) and stepping down the electric power from the running battery (4) and supplying it to the auxiliary machine battery (18), and a radiator (15) arranged in front of the running battery (4), wherein the voltage converter (19) and the radiator (15) are arranged in a horizontally aligned state when viewed from above.

Description

Technical Field

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

[0002] The working vehicle described in Patent Document 1 (“tractor” in Patent Document 1) includes an engine and a travel device (“front wheels” and “rear wheels” in Patent Document 1) driven by the engine.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2018-69926 Summary of the invention

[0006] Problems to be solved by the invention

[0007] In the work vehicle described in Patent Document 1, it is conceivable to provide a battery and a motor instead of the engine, thereby enabling the vehicle to travel without emitting exhaust gas.

[0008] Furthermore, in the work vehicle described in Patent Document 1, it is conceivable to provide a cooling water path passing through various devices and cool the cooling water using a radiator. This makes it possible to cool various devices.

[0009] Furthermore, in the work vehicle described in Patent Document 1, it is conceivable to provide an auxiliary machine battery and a voltage converter for stepping down the power from the running battery and supplying the power to the auxiliary machine battery. Thus, power can be supplied to the auxiliary machine battery.

[0010] Here, depending on the arrangement positions of the voltage converter and the heat sink, it is conceivable that both the voltage converter and the heat sink cannot be cooled satisfactorily, and maintenance work may become complicated.

[0011] For example, in a structure where the voltage converter is arranged in front of the radiator, the cooling air supplied from the front of the radiator toward the radiator as the work vehicle travels is blocked by the voltage converter. As a result, although the voltage converter is well cooled, the radiator cannot be well cooled. In other words, it is impossible to achieve both good cooling of the voltage converter and good cooling of the radiator.

[0012] In addition, for example, in a structure where the voltage converter is arranged at a position behind the driving battery and the radiator is arranged at a position in front of the driving battery, the voltage converter and the radiator are arranged in a dispersed manner in front of and behind the driving battery. As a result, it is often difficult to maintain the voltage converter and the radiator at the same time. As a result, the maintenance work often becomes complicated.

[0013] An object of the present invention is to provide an electric working vehicle that achieves both good cooling of a voltage converter and good cooling of a radiator and facilitates maintenance work.

[0014] Solutions to Solve Problems

[0015] The present invention is characterized in that it comprises: a driving battery; an auxiliary machine battery; a motor, which is driven by the power supplied from the driving battery; a driving device, which is driven by the motor; a voltage converter, which is arranged at a position closer to the front side than the driving battery and steps down the power from the driving battery and supplies it to the auxiliary machine battery; and a radiator, which is arranged at a position closer to the front side than the driving battery, and the voltage converter and the radiator are arranged in a horizontally arranged state when viewed from above.

[0016] According to the present invention, the voltage converter and the radiator are arranged in a horizontally aligned state when viewed from above. Therefore, as the work vehicle travels, cooling air is supplied to the voltage converter and the radiator in parallel. That is, the cooling air supplied to one of the voltage converter and the radiator is not blocked by the other of the voltage converter and the radiator.

[0017] This makes it possible to achieve both good cooling of the voltage converter and good cooling of the heat sink.

[0018] Furthermore, according to the present invention, the voltage converter and the radiator are collectively arranged at a position in front of the driving battery, thereby making it easy to simultaneously maintain the voltage converter and the radiator, thereby making it easy to perform maintenance work.

[0019] That is, according to the present invention, it is possible to realize an electric working vehicle that achieves both good cooling of the voltage converter and good cooling of the radiator and that facilitates maintenance work.

[0020] Furthermore, in the present invention, it is preferable that the radiator, the voltage converter, and the auxiliary machine battery are arranged in a state of being horizontally aligned in a plan view.

[0021] According to this configuration, cooling air is supplied in parallel to the radiator, the voltage converter, and the auxiliary battery as the work vehicle travels, so that the radiator, the voltage converter, and the auxiliary battery are all easily and satisfactorily cooled.

[0022] Furthermore, according to this structure, the radiator, the voltage converter, and the auxiliary battery are collectively arranged at a position forward of the driving battery. This makes it easy to simultaneously maintain the radiator, the voltage converter, and the auxiliary battery. Therefore, maintenance work is easy.

[0023] Furthermore, in the present invention, it is preferable that a reserve tank for the radiator is provided, and the radiator, the voltage converter, and the reserve tank are arranged in a horizontally aligned state in a plan view.

[0024] According to this configuration, cooling air is supplied in parallel to the radiator, the voltage converter, and the reserve tank as the work vehicle travels, so that the radiator, the voltage converter, and the reserve tank are all easily and satisfactorily cooled.

[0025] Furthermore, according to this structure, the radiator, the voltage converter, and the reserve tank are collectively arranged at a position forward of the driving battery, thereby making it easy to simultaneously maintain the radiator, the voltage converter, and the reserve tank, thereby making it easy to perform maintenance work.

[0026] Furthermore, in the present invention, it is preferable that the reserve tank and the auxiliary machine battery are arranged in a state of being aligned in a vertical direction of a machine body.

[0027] According to this configuration, cooling air is supplied in parallel to the radiator, the voltage converter, the reserve tank, and the auxiliary battery as the work vehicle travels, so that all of the radiator, the voltage converter, the reserve tank, and the auxiliary battery can be easily and satisfactorily cooled.

[0028] Furthermore, according to this structure, the radiator, voltage converter, reserve tank and auxiliary machine battery are collectively arranged in a position forward of the driving battery. Thus, the radiator, voltage converter, reserve tank and auxiliary machine battery can be easily maintained at the same time. Therefore, maintenance work can be easily performed.

[0029] Moreover, according to this structure, the space required for arranging the reserve tank and the auxiliary battery in the horizontal direction of the machine body is likely to be smaller than when the reserve tank and the auxiliary battery are arranged in a horizontally aligned state in a plan view.

[0030] Furthermore, in the present invention, it is preferred that a door-shaped radiator frame is provided to surround the radiator and support the radiator, and the voltage converter is arranged with its long side along the vertical direction of the machine body and mounted on the radiator frame.

[0031] According to this structure, compared with the case where the voltage converter is arranged with its longitudinal direction along the horizontal direction of the machine body, the space required for arranging the voltage converter in the horizontal direction of the machine body can be reduced. Therefore, the lateral width of the machine body can be made compact.

[0032] Furthermore, according to this structure, a structure in which the voltage converter is supported on the radiator frame can be realized. Thus, it is not necessary to provide a dedicated component for supporting the voltage converter. Therefore, compared with the case in which a dedicated component is provided for supporting the voltage converter, the manufacturing cost is likely to be reduced.

[0033] Furthermore, in the present invention, it is preferred that: a cooling water hose is provided, which is connected to the radiator; a cover component, which accommodates the voltage converter, the radiator, the cooling water hose and the radiator frame and is openable and closable; a support portion, which extends upward from the upper portion of the radiator frame; and a cover support component, which is connected to the upper end of the support portion and can support the cover component in an open state, the support portion comprising: a first portion extending upward from the upper portion of the radiator frame, a second portion extending forward from a middle portion of the first portion in the up-down direction of the machine body, and a third portion extending downward from a front end portion of the second portion and connected to the upper portion of the radiator frame, the cooling water hose is arranged in a state of passing through an area surrounded by the first portion, the second portion and the third portion.

[0034] According to this structure, the support part is connected to the upper part of the radiator frame at the first and third locations. Therefore, compared with the case where the support part is connected to the upper part of the radiator frame only at one of the first and third locations, the support part is easily and stably supported by the radiator frame.

[0035] Furthermore, according to this configuration, the area surrounded by the first portion, the second portion, and the third portion can be effectively utilized as a space for arranging the cooling water hose. Thus, the size of the electric working vehicle can be easily reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a right side view of the tractor.

[0037] Figure 2 It is a right side view showing the structure around the propulsion battery.

[0038] Figure 3 yes Figure 2 III-III cross-sectional view.

[0039] Figure 4 yes Figure 2 IV-IV section view.

[0040] Figure 5 It is a perspective view showing the structure around the heat sink.

[0041] Figure 6 It is a plan view showing the structure of a motor and the like.

[0042] Figure 7 It is a diagram showing the structure of a connecting portion and the like.

[0043] Figure 8 It is a figure which shows the structure of the periphery of an opening. DETAILED DESCRIPTION

[0044] The mode for implementing the present invention will be described based on the accompanying drawings. Figure 1 to Figure 3 , Figure 6 , Figure 7 The direction of the arrow F shown is set to "front", the direction of the arrow B is set to "back", and Figure 3 , Figure 4 , Figure 6 The direction of the arrow L shown in FIG. 1 is set to “left”, and the direction of the arrow R is set to “right”. Figure 1 , Figure 2 , Figure 4 The direction of the arrow U shown is set to "upward", and the direction of the arrow D is set to "downward".

[0045] [Overall structure of the tractor]

[0046] like Figure 1 As shown, tractor A (equivalent to the "electric working vehicle" of the present invention) has left and right front wheels 10 (equivalent to the "travel device" of the present invention), left and right rear wheels 11 (equivalent to the "travel device" of the present invention), a cover part 12, and a tilling device 13.

[0047] Furthermore, the tractor A includes a frame 2 and a driving unit 3 .

[0048] The frame 2 is supported by left and right front wheels 10 and left and right rear wheels 11. In addition, a tilling device 13 is supported at the rear portion of the frame 2.

[0049] The cover member 12 is disposed at the front portion of the machine body. Furthermore, the driving unit 3 is provided behind the cover member 12 .

[0050] The driving unit 3 includes a protection frame 30, a driver's seat 31, a steering wheel 32, and a floor 33. An operator can sit on the driver's seat 31. In addition, the operator can perform various driving operations in the driving unit 3.

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

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

[0053] The tractor A also includes a travel battery 4, a motor M, a transmission T, and a front transmission mechanism FT.

[0054] The cover member 12 is configured to be able to rotate around an opening and closing axis Q (see Figure 2 ) swings. Thus, the cover member 12 is configured to be openable and closable. Moreover, when the cover member 12 is in the closed state, the driving battery 4 is accommodated in the cover member 12. Moreover, the driving battery 4 supplies power to the motor M.

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

[0056] The transmission device T is located at the rear side of the driving battery 4 and is arranged behind the motor M. In addition, the front transmission mechanism FT extends from the transmission device T to the front side. And 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. In addition, 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 includes a motor M disposed below the running battery 4 and driven by electric power supplied from the running battery 4. The tractor A also includes left and right front wheels 10 and left and right rear wheels 11 driven by the motor M.

[0058] In addition, the transmission device T transmits a part of the driving force received from the motor M to the tilling device 13. As a result, the tilling device 13 is driven.

[0059] With the above configuration, the tractor A can perform tilling work using the tilling device 13 while traveling using the left and right front wheels 10 and the left and right rear wheels 11 .

[0060] [Configuration of driving battery, motor, and inverter]

[0061] like Figure 2 to Figure 4 As shown, the driving battery 4 is arranged above the rack 2. A ventilation space S is formed between the rack 2 and the driving battery 4.

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

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

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

[0065] The inverter 14 is configured to convert direct current power from the driving battery 4 into alternating current power and supply the alternating current power to the motor M.

[0066] That is, the tractor A includes the inverter 14 which is disposed below the running battery 4 and in front of the motor M and converts the DC power from the running battery 4 into AC power and supplies the AC power to the motor M.

[0067] The motor M and the inverter 14 are arranged in a state of being aligned in the front-rear direction of the machine body.

[0068] In addition, 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 be ventilated.

[0069] In addition, 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 be ventilated.

[0070] Also, the motor M is arranged 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 rack 2 includes left and right main frames 20 and an inverter support portion 21. The left and right main frames 20 extend in the machine body front-rear direction.

[0073] That is, the tractor A includes a left main frame 20 and a right main frame 20 extending in the front-rear direction of the machine 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 in a state of straddling the left and right main frames 20. In addition, the inverter support portion 21 is supported by the left and right main frames 20. Furthermore, 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] exist Figure 3 1 and 2 show 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 portion 21.

[0078] like Figure 3 As shown in FIG. 1 , 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 side of 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 to the left side of the left end position of the left main frame 20.

[0080] In addition, Figure 3 1 and 2 show 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 portion 21.

[0081] like Figure 3 As shown in FIG. 1 , 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 side relative to 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 to the right side of the right main frame 20.

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

[0084] Inverter support portion 21 protrudes to the left side of a left end position of left main frame 20 , and protrudes to the right side of a right end position of right main frame 20 .

[0085] like Figure 2 to Figure 4 As shown, the tractor A includes left and right first support frames 51 , left and right second support frames 52 , 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. In addition, the left and right first support frames 51 and the left and right second support frames 52 are both provided upright 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 frame 2 .

[0088] The plate-shaped support portion 38 and the plate-shaped partition member 56 described later are provided between the motor M and the driving battery 4. The plate-shaped support portion 38 and the plate-shaped partition member 56 are both in a horizontal position. 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 machine frame 2 . 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 frame 2. The battery support portion 53 is supported by the left and right first support frames 51, the second support frame 52, and the rear support frame 59. The battery support portion 53 supports the propulsion battery 4.

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

[0092] With the above configuration, the propulsion 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 portion 21 via first support frames 51 provided upright on the left and right sides of the inverter support portion 21. In addition, the driving battery 4 is supported by the inverter support portion 21 via second support frames 52 provided upright on the left and right sides of the inverter support portion 21.

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

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

[0096] Furthermore, the left and right ventilation openings K are communicated 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] In addition, if Figure 2 As shown in FIG. 1 , the battery support 53 has a plate-shaped bottom plate 53 a. The bottom plate 53 a is provided in a horizontal position. The bottom plate 53 a separates the driving battery 4 from the inverter 14 .

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

[0100] [Arrangement of the first plate-shaped member and the second plate-shaped member]

[0101] like Figure 2 as well as Figure 4 As shown, the tractor A includes a first plate-shaped member 54 and a second plate-shaped member 55 .

[0102] The first plate member 54 and the second plate member 55 are respectively provided so as to straddle the left and right main frames 20. The first plate member 54 is located in front of the second plate member 55. Both the first plate member 54 and the second plate member 55 are supported by the left and right main frames 20.

[0103] That is, the frame 2 supports the first plate-shaped member 54 and the second plate-shaped member 55 .

[0104] The first plate-shaped member 54 and the second plate-shaped member 55 are both arranged below the ventilation space S in a horizontal posture.

[0105] [Structure of cover member]

[0106] like Figure 1 as well as Figure 3 As shown in FIG. 1 , the cover member 12 includes an introduction portion 12 a. The introduction portion 12 a is configured to be able to introduce external air into the inner side of the cover member 12. The introduction portion 12 a is provided at the front end portion of the cover member 12.

[0107] In this embodiment, the introduction part 12a is composed of a plurality of small holes. However, the present invention is not limited thereto, and the introduction part 12a may also be in any other manner. For example, the introduction part 12a may also be composed of one hole. In addition, the introduction part 12a may also include a blower for introducing external air.

[0108] Moreover, the cover member 12 has left and right discharge parts 12b. The left and right discharge parts 12b are configured to be able to discharge the air inside the cover member 12 to the outside.

[0109] That is, the cover member 12 has left and right discharge portions 12 b that can discharge the air inside the cover member 12 to the outside.

[0110] The left discharge portion 12b is provided at the left side portion of the cover member 12. In addition, the right discharge portion 12b is provided at the right side portion of the cover member 12.

[0111] The left discharge portion 12b is located on the left side of the driving battery 4. The right discharge portion 12b is located on the right side of the driving battery 4. That is, the left and right discharge portions 12b are located on the lateral sides of the driving battery 4, respectively.

[0112] In this embodiment, the left and right discharge parts 12b are respectively formed by a plurality of small holes. However, the present invention is not limited thereto, and the left and right discharge parts 12b may also be formed in any other manner. For example, the left and right discharge parts 12b may also be respectively formed by one hole. In addition, the left and right discharge parts 12b may also include a blower for air discharge.

[0113] 〔Configuration of water pump, radiator and fan〕

[0114] like Figure 2 to Figure 4 As shown, the tractor A includes a radiator 15 and a water pump 16. The radiator 15 is disposed on the front side of the battery 4 for traveling.

[0115] That is, the tractor A includes the radiator 15 located on the front side of the battery 4 for traveling.

[0116] The radiator 15 and the water pump 16 are included in a cooling water path in the tractor A. The water pump 16 pumps cooling water under pressure, so that the cooling water circulates in the cooling water path. Then, the cooling water is cooled by passing through the radiator 15 .

[0117] That is, the tractor A includes a water pump 16 for pressure-feeding the cooling water passing through the radiator 15 .

[0118] Furthermore, the water pump 16 is disposed in front of the motor M and below the inverter 14 . The water pump 16 is supported by the first plate-shaped member 54 .

[0119] The tractor A also includes a cooling fan 17. The cooling fan 17 is disposed in front of the battery 4 for traveling. That is, the cooling fan 17 is located on the front side of the battery 4 for traveling.

[0120] When the cover member 12 is in the closed state, the radiator 15 and the cooling fan 17 are accommodated in the cover member 12 .

[0121] That is, the tractor A includes the cover member 12 that houses the cooling fan 17 and the travel battery 4 .

[0122] The cooling fan 17 is disposed in a state of straddling the propulsion battery 4 and the ventilation space S in the machine body vertical direction. The cooling fan 17 is disposed in a state of straddling the propulsion battery 4 and the inverter 14 in the machine body vertical direction.

[0123] The cooling fan 17 sends cooling air to the rear side. Thus, the outside air is introduced into the inner side of the cover member 12 through the introduction portion 12a and passes through the radiator 15. As a result, the radiator 15 is cooled.

[0124] That is, the cooling fan 17 cools the radiator 15 and is located on the front side of the propulsion battery 4 .

[0125] Furthermore, cooling air is sent toward the front portion of the propulsion battery 4 and the ventilation space S by the cooling fan 17 .

[0126] That is, the tractor A includes a cooling fan 17 which is disposed in front of the running battery 4 and sends cooling air to the running battery 4 .

[0127] At least a portion of the cooling air sent from the cooling fan 17 to the front of the propulsion battery 4 is returned to the left and right of the propulsion battery 4 and discharged from the left and right discharge portions 12b. Thus, the front and lateral portions of the propulsion battery 4 are cooled.

[0128] A portion of the cooling air sent from the cooling fan 17 to the ventilation space S reaches the first space S1 , and then is discharged to the outside of the cover member 12 through the left and right ventilation openings K and the left and right discharge portions 12 b .

[0129] As a result, the lower portion of the propulsion battery 4 and the inverter 14 are cooled.

[0130] In addition, another part of the cooling air sent from the cooling fan 17 to the ventilation space S reaches the first space S1, flows directly in the ventilation space S, and passes through the second space S2.

[0131] As a result, the lower portion of the driving battery 4, the inverter 14, and the motor M are cooled.

[0132] [Structure related to wind vane]

[0133] like Figure 2 As shown in FIG. 1 , a plate-shaped partition member 56 is provided between the battery support portion 53 and the motor M in a horizontal posture.

[0134] The plate-shaped partition member 56 has a wind direction plate 56a. The wind direction plate 56a is formed by bending the front end of the plate-shaped partition member 56 downward. Therefore, the wind direction plate 56a is in a vertical posture. Thus, the wind direction plate 56a faces the cooling fan 17.

[0135] That is, the tractor A includes the wind deflector 56 a facing the cooling fan 17 .

[0136] Furthermore, the wind direction plate 56a is arranged below the propulsion battery 4 and in front of the second space S2.

[0137] Thus, the cooling air flowing toward the second space S2 among the cooling air flowing through the ventilation space S is guided by the wind direction plate 56a to a position below the wind direction plate 56a. Thus, the cooling air easily flows toward the motor M. As a result, the motor M is well cooled by the cooling air.

[0138] [Arrangement of auxiliary machine batteries, voltage converters, etc.]

[0139] like Figure 3 to Figure 5 As shown in FIG. 1 , the tractor A includes a reserve tank 5 for the radiator 15 . The reserve tank 5 can store cooling water. The reserve tank 5 is disposed on the right side of the radiator 15 at a position in front of the battery 4 for traveling.

[0140] In addition, if Figure 2 to Figure 5 As shown, the tractor A includes an auxiliary machine battery 18 and a voltage converter 19. The auxiliary machine battery 18 supplies electric power to various auxiliary machines such as a cooling fan 17.

[0141] In addition, electric power is transmitted from the running battery 4 to the voltage converter 19. Then, the voltage converter 19 steps down the voltage of the electric power from the running battery 4 and supplies the electric power to the auxiliary machine battery 18.

[0142] That is, the tractor A includes a voltage converter 19 that is disposed on the front side of the running battery 4 and steps down the voltage of the electric power from the running battery 4 and supplies the electric power to the auxiliary machine battery 18 .

[0143] Auxiliary battery 18 and voltage converter 19 are arranged in front of driving battery 4 and on the right side of radiator 15. Voltage converter 19 is arranged with its longitudinal direction along the vertical direction of the machine body.

[0144] Moreover, if Figure 3 As shown, voltage converter 19 and radiator 15 are arranged in a state of being horizontally aligned in a plan view. In addition, radiator 15, voltage converter 19, and auxiliary battery 18 are arranged in a state of being horizontally aligned in a plan view.

[0145] In addition, voltage converter 19 is disposed at a position sandwiched between radiator 15 and auxiliary machine battery 18 in a plan view.

[0146] In addition, the radiator 15 , the voltage converter 19 , and the reserve tank 5 are arranged in a state of being horizontally aligned in a plan view.

[0147] In addition, the voltage converter 19 is arranged at a position sandwiched between the radiator 15 and the reserve tank 5 in a plan view.

[0148] In addition, if Figure 3 as well as Figure 4 As shown, the reserve tank 5 is arranged above the auxiliary machine battery 18. Furthermore, the reserve tank 5 and the auxiliary machine battery 18 are arranged in a state of being aligned in the vertical direction of the machine body.

[0149] In addition, if Figure 2 as well as Figure 3 As shown, the tractor A is provided with an oil cooler CL. The hydraulic oil in the tractor A is cooled by the oil cooler CL.

[0150] 〔Structure related to radiator frame〕

[0151] like Figure 2 , Figure 3 , Figure 5 As shown in FIG. 1 , the radiator 15 is supported by a door-shaped radiator frame 57 . The radiator frame 57 is disposed so as to surround the radiator 15 .

[0152] That is, the tractor A includes a door-shaped radiator frame 57 that is disposed in a state of surrounding the radiator 15 and supports the radiator 15 .

[0153] The radiator frame 57 includes a left side plate 57 a , a top plate 57 b , a right side plate 57 c , a first top plate support portion 57 d , and a second top plate support portion 57 e .

[0154] The left side plate 57a is located at the left portion of the radiator frame 57. The top plate 57b is located at the upper portion of the radiator frame 57. The right side plate 57c is located at the right portion of the radiator frame 57.

[0155] The left side plate 57a and the right side plate 57c are arranged in a vertical position in a horizontally aligned state. In addition, the left side plate 57a and the right side plate 57c are arranged in a position facing each other.

[0156] The first top plate support portion 57d is provided in a state extending to the left from the upper end portion of the left side plate 57a. In addition, the second top plate support portion 57e is provided in a state extending to the right from the upper end portion of the right side plate 57c. Furthermore, 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.

[0157] Furthermore, the voltage converter 19 is mounted on the heat sink frame 57. More specifically, the voltage converter 19 is mounted on the right side of the right side plate 57c.

[0158] The tractor A also includes a first hose 6a (corresponding to the "cooling water hose" of the present invention), a second hose 6b, a water supply unit 6c, and a third hose 6d. The first hose 6a, the second hose 6b, the water supply unit 6c, and the third hose 6d are included in the cooling water path in the tractor A.

[0159] One end of the first hose 6a is connected to the radiator 15. The other end of the first hose 6a is connected to the water supply unit 6c.

[0160] That is, the tractor A includes the first hose 6 a connected to the radiator 15 .

[0161] One end of the second hose 6 b is connected to the water supply unit 6 c , and the other end of the second hose 6 b is connected to the voltage converter 19 .

[0162] The third hose 6 d is connected to the voltage converter 19 .

[0163] The 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.

[0164] like Figure 2 , Figure 3 , Figure 5 As shown in FIG. 1 , 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 an upper portion of the radiator frame 57.

[0165] That is, the tractor A includes the support portion 7 extending upward from the upper portion of the radiator frame 57 .

[0166] 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 portion 7 in a state where it can swing up and down around a swing axis P along the front-rear direction of the machine body.

[0167] When the cover support member 58 is swung upward and in an upright state and the cover member 12 is in an open state, the other end of the cover support member 58 can abut against the inner wall surface of the cover member 12. Moreover, by making the other end of the cover support member 58 abut against the inner wall surface of the cover member 12, the cover member 12 is supported by the cover support member 58.

[0168] According to this structure, the cover support member 58 can support the cover member 12 in the opened state.

[0169] That is, the tractor A includes the cover support member 58 which is connected to the upper end portion of the support portion 7 and can support the cover member 12 in the open state.

[0170] When the cover member 12 is in the closed state, the voltage converter 19 , the first hose 6 a , the radiator frame 57 , the reserve tank 5 , and the auxiliary battery 18 are accommodated in the cover member 12 .

[0171] That is, the tractor A includes the openable and closable cover member 12 that accommodates the voltage converter 19 , the radiator 15 , the first hose 6 a , and the radiator frame 57 .

[0172] Furthermore, the support portion 7 has a first portion 71 , a second portion 72 , and a third portion 73 .

[0173] 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 .

[0174] The second portion 72 extends forward from the middle portion in the vertical direction of the first portion 71. The second portion 72 is in a horizontal position.

[0175] 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 in a posture where the front is low and the rear is high. The rear end of the third portion 73 is connected to the front end of the second portion 72. In addition, the front end of the third portion 73 is connected to the upper portion of the radiator frame 57.

[0176] That is, the support portion 7 includes: 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 machine body, and a third portion 73 extending downward from the front end portion of the second portion 72 and connected to the upper portion of the radiator frame 57.

[0177] The first hose 6 a is arranged to pass through the region AR surrounded by the first portion 71 , the second portion 72 , and the third portion 73 .

[0178] Here, the first part 71 is described in detail. The first part 71 has a support stay 71a and a vertical fixing portion 71b. The support stay 71a is a long plate, extending in the vertical direction of the machine body along the left side plate 57a. In addition, the lower end of the support stay 71a is fixed to the rear end of the upper end of the left side plate 57a by bolts.

[0179] The vertical fixing portion 71b is in the shape of an elongated plate and extends in the vertical direction of the machine body. In addition, in the vertical direction of the machine body, the length of the vertical fixing portion 71b is shorter than the length of the support stay 71a.

[0180] The vertical fixing portion 71b is fixed to the left side of the support stay 71a in a posture perpendicular to the support stay 71a. The vertical fixing portion 71b, the second portion 72, and the third portion 73 are integrally formed.

[0181] Furthermore, the above-mentioned region AR is surrounded by the support stay 71 a , the second portion 72 , and the third portion 73 .

[0182] In addition, if Figure 2 to Figure 5As shown, a support plate SP in a horizontal posture is provided at the front of the tractor A. The radiator 15, the cooling fan 17, the auxiliary battery 18, the voltage converter 19, the radiator frame 57, and the oil cooler CL are supported by the support plate SP.

[0183] [Structure related to hydraulic pump]

[0184] like Figure 1 and Figure 2 As shown, the tractor A includes a hydraulic pump 60. The hydraulic pump 60 supplies hydraulic oil to an operating mechanism for operating the tilling device 13. The tilling device 13 can be operated by controlling the supply of the hydraulic oil.

[0185] More specifically, the tractor A has a lifting mechanism 36 as a working mechanism of the working device. The hydraulic pump 60 supplies hydraulic oil to the lifting mechanism 36. As a result, the lifting mechanism 36 is operated. And, by the operation of the lifting mechanism 36, the tilling device 13 is raised and lowered. The driving part of the tilling part 13a of the tilling device 13 is connected to the PTO shaft 37 of the tractor A, and the tilling work can be performed by the power thereof.

[0186] Moreover, if Figure 2 , Figure 4 , Figure 6 As shown, the hydraulic pump 60 is arranged adjacent to the motor M.

[0187] like Figure 2 As shown, the motor M is supported by a front support frame 50 and a rear support frame 59 .

[0188] The front support frame 50 is provided in a state of straddling the left and right main frames 20. In addition, the front support frame 50 is fixed to the lower part of the left and right main frames 20. In addition, 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.

[0189] The rear support frame 59 is provided in a state of straddling the left and right main frames 20. In addition, the rear support frame 59 is in contact with the rear end portion of the motor M. Furthermore, the rear support frame 59 supports the rear portion of the motor M.

[0190] like Figure 2 as well as Figure 6 As shown in FIG. 1 , the hydraulic pump 60 is mounted on the rear support frame 59 from the front side. Thus, the hydraulic pump 60 is supported by the rear support frame 59.

[0191] That is, the motor M and the hydraulic pump 60 are supported by the common rear support frame 59 .

[0192] In addition, if Figure 6As shown in FIG. 1 , a first rotating body 64 is mounted on a motor output shaft 61 that is an output shaft of the motor M. The first rotating body 64 rotates integrally with the motor output shaft 61 .

[0193] That is, the tractor A includes a first rotating body 64 which is attached to the motor output shaft 61 and rotates integrally with the motor output shaft 61 .

[0194] Moreover, the 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.

[0195] That is, the tractor A includes a second rotating body 65 which is attached to a pump input shaft 62 which is an input shaft of the hydraulic pump 60 and rotates integrally with the pump input shaft 62 .

[0196] Furthermore, the endless rotating body 66 is wound around the first rotating body 64 and the second rotating body 65 .

[0197] That is, the tractor A includes an endless rotating body 66 wound around the first rotating body 64 and the second rotating body 65 .

[0198] In addition, 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 may not be a belt. For example, the endless rotating body 66 may be a chain.

[0199] 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. Thus, the hydraulic pump 60 is driven.

[0200] That is, the tractor A includes a hydraulic pump 60 that is driven by the motor M and supplies hydraulic oil to the tilling device 13 .

[0201] In addition, the transmission input shaft 63 as the input shaft of the transmission device T and the motor output shaft 61 are connected by the connection part 8. Thus, the transmission input shaft 63 and the motor output shaft 61 rotate integrally.

[0202] In detail, Figure 7 As shown, the motor output shaft 61 and the transmission input shaft 63 are both formed into a cylindrical shape and extend along the front-rear direction of the machine body. In addition, the connecting portion 8 has a connecting shaft 81 and a pin 82.

[0203] The connecting shaft 81 extends in the front-rear direction of the machine body. The front end of the connecting shaft 81 is inserted into the motor output shaft 61 and splined with the motor output shaft 61. In addition, the rear end of the connecting shaft 81 is inserted into the transmission input shaft 63 and splined with the transmission input shaft 63.

[0204] 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 connecting shaft 81. The pin 82 prevents the connecting shaft 81 from sliding backward.

[0205] exist Figure 7 In the state shown on the left side of the paper, the transmission input shaft 63 and the motor output shaft 61 cannot rotate relative to each other.

[0206] That is, the tractor A includes the connection 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 are non-rotatable relative to each other.

[0207] Moreover, if Figure 7 As shown, the connection portion 8 is configured to be able to change state between a connection state and a non-connection state. The connection state refers to a state in which the transmission input shaft 63 and the motor output shaft 61 are connected. In addition, the non-connection state refers to a state in which the transmission input shaft 63 and the motor output shaft 61 are not connected.

[0208] exist Figure 7 In the state shown on the left side of the paper, the connecting portion 8 is in a connected state. At this time, 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 and the motor output shaft 61 rotate integrally.

[0209] That is, when the connection portion 8 is in the connected state, the transmission input shaft 63 rotates integrally with the motor output shaft 61 .

[0210] Then, by pulling the pin 82 out of the pin hole 63a and sliding the connecting shaft 81 backward, the connecting portion 8 becomes Figure 7 The state shown on the right side of the paper. Figure 7 In the state shown on the right side of the paper, the connecting portion 8 is in a non-connected state.

[0211] At this time, the connecting shaft 81 is separated from the motor output shaft 61. Moreover, a gap G is formed between the front end of the connecting shaft 81 and the rear end of the motor output shaft 61.

[0212] 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. Moreover, the width of the gap G is larger than the width of the annular rotating body 66. Thus, when the annular rotating body 66 is removed from the first rotating body 64 or the second rotating body 65, the annular rotating body 66 can pass through the gap G.

[0213] That is, when the connection portion 8 is in the unconnected 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 removed endless rotating body 66 can pass.

[0214] [Structure of the first rotating body]

[0215] like Figure 7 As shown in FIG. 1 , the first rotating body 64 includes a first split body 67 and a second split body 68. The first split body 67 is located in front of the second split body 68. Figure 7 As shown on the left side of the paper, the front side surface of the second split body 68 is in contact with the rear side surface of the first split body 67.

[0216] The first split 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 rotor 66. The flange portion 67b is located at the front end portion of the first split body 67. The flange portion 67b protrudes in the radial direction.

[0217] The second split 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 split body 68 is the same as the outer diameter of the flange portion 67b.

[0218] According to this structure, Figure 7 As shown on the right side of the paper, the second split body 68 can be removed by removing a plurality of fixing bolts 69. Moreover, in a state where the second split body 68 is removed, the annular rotating body 66 can be easily removed from the first rotating body 64 by moving the annular rotating body 66 to the rear side.

[0219] Furthermore, when the connection portion 8 is in the unconnected 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 the endless rotating body 66 through the gap G.

[0220] When the endless rotating body 66 is mounted on the tractor A, the operator passes the endless rotating body 66 through the gap G and winds it around the winding portion 67a. Figure 7 Thus, the annular rotating body 66 can be easily mounted on the tractor A.

[0221] [Structure related to tension adjustment mechanism]

[0222] like Figure 8 As shown, the tractor A is provided with a tension adjustment mechanism 9. The tension adjustment mechanism 9 includes a tension pulley 91, a long connecting member 92, and an adjustment unit 93.

[0223] The tension pulley 91 contacts the endless rotating body 66 and applies tension to the endless rotating body 66. The tension pulley 91 is supported by the frame 2 via a connecting member 92.

[0224] The adjustment part 93 is configured to be manually operable. By manually operating the adjustment part 93, the connecting member 92 moves in the longitudinal direction of the connecting member 92. Moreover, along with the movement of the connecting member 92, the tensioning wheel 91 moves in the longitudinal direction of the connecting member 92. As a result, the tension of the endless rotating body 66 changes.

[0225] With the above structure, the tension adjustment mechanism 9 is configured to be able to adjust the tension of the endless rotating body 66 by manual operation.

[0226] That is, the tractor A includes the tension adjustment mechanism 9 which can adjust the tension of the endless rotor 66 by human operation.

[0227] In addition, if Figure 1 , Figure 2 , Figure 8 As shown, the driving part 3 has a wall part 34 and an opening cover member 35 .

[0228] The wall portion 34 is provided to partition the driver's seat 31 from the endless rotating body 66 and the tension adjustment mechanism 9. In addition, an opening 34a is formed in the wall portion 34 near the tension adjustment mechanism 9. In addition, the opening 34a is located near the front end of the floor 33.

[0229] The opening cover member 35 is provided in a state of blocking the opening 34a. Moreover, the opening cover member 35 is configured to be detachable. By removing the opening cover member 35, the opening 34a is opened. In addition, by installing the opening cover member 35, the opening 34a is closed.

[0230] Specifically, the opening cover member 35 is mounted on the wall portion 34 by means of bolts b1. The opening cover member 35 can be removed by removing the bolts b1. Figure 8 In FIG. 1 , only one bolt b1 is shown, but the number of the bolts b1 may be any number greater than one.

[0231] That is, the driving section 3 includes a wall portion 34 that partitions the driving seat 31 from the endless rotating body 66 and the tension adjustment mechanism 9. In addition, the driving section 3 includes an opening cover member 35 that can open and close the opening 34a.

[0232] The present invention is not limited thereto, and the opening cover member 35 may be mounted on 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 mounted on the wall portion 34 by fitting the convex portion and the concave portion.

[0233] By removing the opening cover member 35 , the operator can easily reach the adjustment portion 93 through the opening 34 a .

[0234] According to the above-described structure, the voltage converter 19 and the radiator 15 are arranged in a horizontally aligned state in a plan view. Therefore, as the tractor A travels, cooling air is supplied to the voltage converter 19 and the radiator 15 in parallel. That is, the cooling air supplied to one of the voltage converter 19 and the radiator 15 is not blocked by the other of the voltage converter 19 and the radiator 15.

[0235] This makes it possible to achieve both favorable cooling of voltage converter 19 and favorable cooling of heat sink 15 .

[0236] Furthermore, according to the above-described configuration, voltage converter 19 and radiator 15 are collectively arranged in front of driving battery 4. This makes it easy to simultaneously maintain voltage converter 19 and radiator 15. Therefore, maintenance work is easy.

[0237] That is, according to the configuration described above, it is possible to realize the tractor A which can achieve both good cooling of the voltage converter 19 and good cooling of the radiator 15 and can facilitate maintenance work.

[0238] The above-described embodiment is merely an example, and the present invention is not limited thereto, but can be modified as appropriate.

[0239] [Other implementation methods]

[0240] (1) The number of first support frames 51 provided may be one or three or more.

[0241] (2) The number of second support frames 52 provided may be one or three or more.

[0242] (3) The number of ventilation openings K may be one or more than three.

[0243] (4) The number of the discharge portions 12b provided may be one or three or more.

[0244] (5) A single air hole may be provided in the cover member 12, and the air hole may be used as both the introduction portion 12a and the discharge portion 12b.

[0245] (6) The second part 72 may not be in a horizontal position. For example, the second part 72 may be in a position where the front is high and the back is low, or in a position where the front is low and the back is high.

[0246] (7) The third portion 73 may not be in a posture that is low in front and high in the back. For example, the third portion 73 may be in a vertical posture or may be in a posture that extends from the front end of the second portion 72 toward the back and downward.

[0247] (8) The connecting shaft 81 may be configured to 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 .

[0248] (9) It is also possible to configure such that, by sliding the connecting shaft 81 backward, the front end of the connecting shaft 81 moves backward compared to the front end of the transmission input shaft 63. In this case, a gap G is formed between the rear end of the motor output shaft 61 and the front end of the transmission input shaft 63.

[0249] (10) The second split body 68 may be fixed to the rear end of the winding portion 67 a by a single fixing bolt 69 .

[0250] (11) The second split 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 split body 67 and a concave portion may be formed on the second split body 68, and the second split body 68 may be fixed to the rear end of the winding portion 67a by fitting the convex portion into the concave portion.

[0251] (12) The outer diameter of the second divided body 68 may be different from the outer diameter of the flange portion 67b.

[0252] (13) The motor M may not be in contact with the ventilation space S.

[0253] (14) The tractor A may include an engine and be configured as a hybrid power.

[0254] (15) The wind direction plate 56a may not be provided.

[0255] (16) The plate-shaped partition member 56 may not be provided.

[0256] (17) The second space S2 may not be formed between the motor M and the driving battery 4.

[0257] (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.

[0258] (19) The first space S1 may not be formed between the inverter 14 and the driving battery 4.

[0259] (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 from each other.

[0260] (21) The cover member 12 may not be provided.

[0261] (22) Some or all of the travel battery 4 , the reserve tank 5 , the first hose 6 a , 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 .

[0262] (23) The discharge portion 12b may not be provided.

[0263] (24) The introduction portion 12a may not be provided.

[0264] (25) The discharge portion 12b may be provided at a position other than the lateral position of the driving battery 4. For example, the discharge portion 12b may be provided at a position further back than the driving battery 4.

[0265] (26) The first plate-shaped member 54 may not be provided.

[0266] (27) The second plate-shaped member 55 may not be provided.

[0267] (28) The first plate-shaped member 54 may not be in a horizontal position. For example, the first plate-shaped member 54 may be inclined so that the front is lower and the rear is higher, or the front is higher and the rear is lower.

[0268] (29) The second plate-shaped member 55 may not be in a horizontal position. For example, the second plate-shaped member 55 may be inclined so that the front is lower and the rear is higher, or the front is higher and the rear is lower.

[0269] (30) The ventilation space S may not be connected to the ventilation opening K.

[0270] (31) The ventilation opening K may not be formed.

[0271] (32) The first support frame 51 may not be provided upright on the frame 2 .

[0272] (33) The second support frame 52 may not be vertically disposed on the frame 2 .

[0273] (34) The first support frame 51 may not be provided.

[0274] (35) The second support frame 52 may not be provided.

[0275] (36) The first hose 6a may be arranged so as not to pass through the region 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 through a position in front of the third portion 73.

[0276] (37) The support portion 7 may not have the second portion 72 and the third portion 73 .

[0277] (38) The cover support member 58 may not be provided.

[0278] (39) The support portion 7 may not be provided.

[0279] (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.

[0280] (41) The voltage converter 19 may be arranged with its long side along the front-rear direction of the machine body, or may be arranged with its long side along the left-right direction of the machine body.

[0281] (42) The voltage converter 19 may not be mounted on the heat sink frame 57 .

[0282] (43) The radiator frame 57 may not be provided.

[0283] (44) The reserve tank 5 and the auxiliary battery 18 may not be arranged in a state of being arranged in the vertical direction of the machine body. For example, the reserve tank 5 and the auxiliary battery 18 may be arranged in a state of being arranged in the horizontal direction of the machine body.

[0284] (45) The radiator 15 , the voltage converter 19 , and the reserve tank 5 may not be arranged in a horizontally aligned state in a plan view. For example, the reserve tank 5 may be arranged above the voltage converter 19 .

[0285] (46) Radiator 15 , voltage converter 19 , and auxiliary battery 18 may not be arranged in a horizontally aligned state in a plan view. For example, auxiliary battery 18 may be arranged above voltage converter 19 .

[0286] (47) The cooling fan 17 may be configured to send cooling air in a direction other than the rearward direction. For example, the cooling fan 17 may be configured to send cooling air in a forward direction.

[0287] (48) The cooling fan 17 may be arranged above the inverter 14 or below the inverter 14 .

[0288] (49) The bottom plate portion 53a may not be provided.

[0289] (50) The inverter support portion 21 may be located to the right of the left end of the left main frame 20 .

[0290] (51) The inverter support portion 21 may be located to the left of the right end of the right main frame 20 .

[0291] (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 .

[0292] (53) The inverter 14 may be located to the right of the left end of the left main frame 20 .

[0293] (54) The inverter 14 may be located to the left of the right end of the right main frame 20 .

[0294] (55) The frame 2 may not have the left and right main frames 20. For example, the frame 2 may be composed of a single frame member.

[0295] (56) The water pump 16 may be arranged at a position other than in front of the motor M. For example, the water pump 16 may be arranged behind the motor M.

[0296] (57) The water pump 16 may be arranged above the inverter 14 .

[0297] (58) The motor M may be disposed at a position other than the position sandwiched between the left and right main frames 20. For example, the motor M may be disposed above the left and right main frames 20.

[0298] (59) The hydraulic pump 60 may not be supported by the rear support frame 59. That is, the motor M and the hydraulic pump 60 may not be supported by the common rear support frame 59.

[0299] (60) The opening cover member 35 may be configured so as not to be able to open and close the opening 34a. For example, the opening cover member 35 may be configured so as not to be able to be removed.

[0300] (61) The opening 34 a may not be formed in the wall portion 34 .

[0301] (62) The wall portion 34 may not be provided.

[0302] (63) The opening cover member 35 may not be provided.

[0303] (64) The tension adjustment mechanism 9 may not be provided.

[0304] (65) The removed annular rotating body 66 may not be able to pass through the gap G.

[0305] (66) The connection portion 8 may be configured so as not to be able to change its state from the connected state to the unconnected state.

[0306] (67) The connecting portion 8 may not be provided.

[0307] (68) The first rotating body 64 and the second rotating body 65 may both be gears and mesh with each other. In this case, the annular rotating body 66 may not be provided.

[0308] (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 a plurality of gears.

[0309] (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.

[0310] (71) Instead of the tilling device 13, various devices such as a fertilizer spreading device, a pesticide spraying device, a sowing device, a harvesting device, and working devices such as a loader and an excavator may be provided.

[0311] (72) The wind direction plate 56a may not be in a vertical position. For example, the wind direction plate 56a may be inclined so that the front is low and the back is high, or the front is high and the back is low.

[0312] (73) The motor M may be disposed at a position other than below the driving battery 4. For example, the motor M may be disposed above the driving battery 4.

[0313] (74) The inverter 14 may be arranged at a position other than below the driving battery 4. For example, the inverter 14 may be arranged above the driving battery 4.

[0314] (75) The cooling fan 17 may be disposed above or below the driving battery 4 , or may be disposed above or below the ventilation space S.

[0315] (76) The ventilation space S may not be formed.

[0316] (77) The cooling fan 17 may be disposed at 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.

[0317] (78) The driving battery 4 may be cooled without using the cooling wind from the cooling fan 17 .

[0318] (79) The driving battery 4 may be arranged at a position overlapping with the frame 2 in a side view, or may be arranged at a position below the frame 2.

[0319] (80) The motor M and the inverter 14 may be arranged in a state of being arranged in the left-right direction of the machine body, or in a state of being arranged in the up-down direction of the machine body.

[0320] (81) The transmission device T may be arranged at a front side relative to the driving battery 4.

[0321] (82) The hydraulic pump 60 may be arranged at a position relatively far from the motor M.

[0322] (83) The hydraulic pump 60 may be driven by a power source other than the motor M.

[0323] Industrial Applicability

[0324] The present invention can be used not only for tractors but also for various electric working vehicles such as combine harvesters, rice transplanters, and construction machines.

[0325] Description of Reference Numerals

[0326] 4 Driving battery

[0327] 5 Reserve Boxes

[0328] 6a First hose (cooling water hose)

[0329] 7 Supporting part

[0330] 10 front wheels (travel device)

[0331] 11 rear wheels (travel device)

[0332] 12 Cover parts

[0333] 15 Radiator

[0334] 18 Auxiliary machine battery

[0335] 19 Voltage Converter

[0336] 57 Radiator frame

[0337] 58 cover support component

[0338] 71 First Part

[0339] 72 Second Part

[0340] 73 The third part

[0341] A Tractor (electric working vehicle)

[0342] AR Zone

[0343] M Motor

Claims

1. An electric working vehicle, wherein: The electric working vehicle comprises: Battery for driving; Auxiliary machine batteries; a motor driven by electric power supplied from the driving battery; A traveling device, wherein the traveling device is driven by the motor; a voltage converter that is disposed in front of the driving battery and steps down the voltage of the electric power from the driving battery and supplies the electric power to the auxiliary battery; and a radiator disposed at a front side of the driving battery and configured to cool cooling water passing through the voltage converter; The voltage converter and the heat sink are arranged in a horizontally aligned state when viewed from above. A cover member is provided, the cover member accommodating the voltage converter and the heat sink and arranged at the front end of the body, An introduction portion capable of introducing external air into the inner side of the cover member is provided at a front end portion of the cover member.

2. The electric working vehicle according to claim 1, wherein: The radiator, the voltage converter, and the auxiliary machine battery are arranged in a state of being laterally aligned in a plan view.

3. The electric working vehicle according to claim 1 or 2, wherein: The electric working vehicle includes a reserve tank for the radiator. The radiator, the voltage converter, and the reserve tank are arranged in a horizontally aligned state in a plan view.

4. The electric working vehicle according to claim 3, wherein: The reserve tank and the auxiliary machine battery are arranged in a state of being aligned in a vertical direction of the machine body.

5. The electric working vehicle according to claim 1 or 2, wherein: The electric working vehicle includes a door-shaped radiator frame that is arranged in a state of surrounding the radiator and supports the radiator. The voltage converter is arranged in a state where the long side direction of the voltage converter is along the vertical direction of the machine body, and is mounted on the heat sink frame.

6. An electric working vehicle, wherein: The electric working vehicle comprises: Battery for driving; Auxiliary machine batteries; a motor driven by electric power supplied from the driving battery; A traveling device, wherein the traveling device is driven by the motor; a voltage converter that is disposed in front of the driving battery and steps down the voltage of the electric power from the driving battery and supplies the electric power to the auxiliary battery; and a radiator, the radiator being arranged at a front side of the driving battery, The voltage converter and the heat sink are arranged in a horizontally aligned state when viewed from above. The electric working vehicle includes a door-shaped radiator frame that is arranged in a state of surrounding the radiator and supports the radiator. The voltage converter is arranged in a state where the long side direction of the voltage converter is along the vertical direction of the machine body, and is mounted on the radiator frame. The electric working vehicle comprises: A cooling water hose connected to the radiator; a cover member, the cover member accommodating the voltage converter, the radiator, the cooling water hose and the radiator frame, and being able to be opened and closed; a support portion extending upward from an upper portion of the radiator frame; as well as a cover support member connected to the upper end of the support portion and capable of supporting the cover member in an open state, The support portion includes a first portion extending upward from the upper portion of the radiator frame, a second portion extending forward from a middle portion of the first portion in the vertical direction of the machine body, and a third portion extending downward from a front end portion of the second portion and connected to the upper portion of the radiator frame. The cooling water hose is arranged to pass through a region surrounded by the first portion, the second portion, and the third portion.

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