Electric tractor

Abstract

To provide an electric tractor in which a battery is stably supported.SOLUTION: An electric tractor includes: a battery 10 disposed at a front part of a machine body; a motor which is driven by electric power supplied from the battery 10; a traveling device which is driven by the motor; a cover member 15 which covers the battery 10; and a cover support part 18 supporting the cover member 15. The battery 10 is supported by the cover support part 18.SELECTED DRAWING: Figure 11

Description

Technical Field

[0001] The present invention relates to an electric tractor.

Background Art

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

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the work vehicle described in Patent Document 1, a configuration in which a battery and a motor are provided instead of the engine is conceivable. Thereby, it is possible to travel without discharging exhaust gas. However, in this configuration, it is required to stably support the battery.

[0005] An object of the present invention is to provide an electric tractor in which a battery is stably supported.

Means for Solving the Problems

[0006] The features of the present invention include a battery disposed at the front part of the vehicle body, a motor driven by electric power supplied from the battery, a traveling device driven by the motor, a cover member covering the battery, and a cover support portion supporting the cover member, and the battery is supported by the cover support portion.

[0007] According to this configuration, the battery is supported by the cover support portion. Here, the cover support portion is configured to be strong enough to support the cover member. Therefore, the battery is stably supported by the cover support portion.

[0008] That is, according to this configuration, it is possible to realize an electric tractor in which the battery is stably supported.

[0009] Furthermore, in the present invention, it is preferable to include a driver's cab where an operator can board, a connection portion extending between the cover support portion and the driver's cab, and the cover support portion is connected to the driver's cab via the connection portion.

[0010] According to this configuration, the cover support portion is supported by the driver's cab via the connection portion. Thereby, the battery is more stably supported by the cover support portion.

[0011] Furthermore, in the present invention, it is preferable that the connection portion has a vibration suppression member that suppresses transmission of vibration of the driver's cab to the cover support portion.

[0012] According to this configuration, for example, when vibration occurs in the driver's cab due to an operator getting on and off the driver's cab, transmission of the vibration of the driver's cab to the cover support portion is suppressed. Thereby, vibration of the cover support portion and the cover member can be suppressed.

[0013] Furthermore, in the present invention, it is preferable that the cover member is openable and closable.

[0014] According to this configuration, an operator can easily access the battery by opening the cover member. Thereby, maintenance work of the battery becomes easier.

[0015] Furthermore, in the present invention, the cover member is openable and closable by swinging up and down about a shaft member extending in the left - right direction of the vehicle body, and it is preferable that the shaft member is supported by the cover support portion.

[0016] According to this configuration, the shaft member is stably supported by a relatively strong cover support portion. Thereby, the opening and closing operation of the cover member becomes stable.

Brief Description of the Drawings

[0017]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Modes for Carrying Out the Invention

[0018] A mode for carrying out the present invention will be described with reference to the drawings. In the following description, unless otherwise specified, the direction of arrow F in the drawings is defined as "front", the direction of arrow B as "rear", the direction of arrow L as "left", and the direction of arrow R as "right". Also, the direction of arrow U in the drawings is defined as "up", and the direction of arrow D as "down".

[0019] 〔Overall Configuration of Electric Tractor〕 As shown in FIG. 1, in the electric tractor A, the left and right front wheels 1 (corresponding to the "traveling device" according to the present invention) are provided at the front part of the vehicle body. Also, the left and right rear wheels 2 (corresponding to the "traveling device" according to the present invention) are provided at the rear part of the vehicle body. The vehicle body is supported by the front wheels 1 and the rear wheels 2.

[0020] The electric tractor A includes left and right front frames 4, a housing frame 5, and a transmission case 6. As shown in FIGS. 1 and 2, the front frame 4 extends in the front-rear direction. The rear end portion of the front frame 4 is connected to the front portion of the housing frame 5. The transmission case 6 is connected to the rear portion of the housing frame 5.

[0021] As shown in FIG. 2, a first motor 11 (corresponding to the "motor" according to the present invention) and a second motor 12 are housed in the housing frame 5. Note that both the first motor 11 and the second motor 12 are electric motors.

[0022] As shown in FIGS. 1 and 2, the front axle case 7 is attached to the front frame 4. The left and right front wheels 1 are attached to the front axle case 7. The left and right rear wheels 2 are attached to the transmission case 6.

[0023] A driver's cab 8 on which an operator (corresponding to the "rider" according to the present invention) can ride is provided above the housing frame 5 and the transmission case 6. That is, the electric tractor A includes a driver's cab 8 on which an operator can ride.

[0024] The rops frame 9 is attached to the mission case 6 and extends upward. The rops frame 9 is provided behind the operation unit 8. A plurality of first batteries 10 (corresponding to the "battery" according to the present invention) are supported by the front frame 4.

[0025] The plurality of first batteries 10 are arranged at the front part of the electric tractor A. Also, a bonnet 15 (corresponding to the "cover member" according to the present invention) that covers the plurality of first batteries 10 is provided. Incidentally, although not particularly limited, the number of the first batteries 10 in the present embodiment is two.

[0026] One or a plurality of air introduction holes (not shown) are formed in the front part of the bonnet 15. Also, traveling wind (air) is introduced into the inside of the bonnet 15 through the air introduction holes.

[0027] The first motor 11 and the second motor 12 are driven by the electric power supplied from the plurality of first batteries 10. Incidentally, although not particularly limited, the plurality of first batteries 10 in the present embodiment are electrically connected in series.

[0028] Thus, the electric tractor A includes the first battery 10 arranged at the front part of the machine body. More specifically, the electric tractor A includes a plurality of first batteries 10. Even more specifically, the electric tractor A includes two first batteries 10. Also, the electric tractor A includes the first motor 11 and the second motor 12 that are driven by the electric power supplied from the first battery 10.

[0029] The first inverter 13 is attached to the left side part of the accommodation frame 5. The second inverter 14 is attached to the right side part of the accommodation frame 5. The electric power of the plurality of first batteries 10 is supplied to the first inverter 13. Based on the operation of the shift pedal 35 (see FIG. 1) of the operation unit 8, the DC power from the plurality of first batteries 10 is converted into AC power in the first inverter 13 and supplied to the first motor 11. Thereby, the first motor 11 is driven.

[0030] Thus, the electric tractor A includes a first inverter 13 that converts DC power from the first battery 10 into AC power and supplies it to the first motor 11.

[0031] Power from a plurality of the first batteries 10 is supplied to the second inverter 14. In the second inverter 14, DC power from the plurality of the first batteries 10 is converted into AC power and supplied to the second motor 12. Thereby, the second motor 12 is driven.

[0032] Thus, the electric tractor A includes a second inverter 14 that converts DC power from the first battery 10 into AC power and supplies it to the second motor 12.

[0033] Although not particularly limited, the first inverter 13 and the second inverter 14 may each be housed in a case (not shown).

[0034] Incidentally, the first battery 10 is, for example, a lithium ion battery. Although not shown, the first battery 10 has a low-voltage small unit battery (cell) and a storage case. In the first battery 10, a large number of unit batteries (cells) are stacked. The large number of unit batteries (cells) are stored and sealed by the storage case. The output voltage of the first battery 10 is, for example, 400 volts.

[0035] A hydraulic multi-plate traveling clutch (not shown), a transmission (not shown), and a rear wheel differential device (not shown), which are transmission mechanisms, are provided inside the transmission case 6. The transmission is configured to be gear-shifted and can switch the gear-shifting state in two stages of a high-speed state and a low-speed state. The power of the output shaft (not shown) of the first motor 11 is transmitted to the traveling clutch, from the traveling clutch to the transmission, and from the transmission to the rear wheels 2 via the rear wheel differential device. Incidentally, the output shaft of the first motor 11 extends rearward.

[0036] Inside the mission case 6, the power branched from between the transmission and the rear wheel differential device is transmitted to the front wheel drive shaft 31 described later, and is transmitted from the front wheel drive shaft 31 to a front wheel differential device (not shown) inside the front axle case 7, and is transmitted from the front wheel differential device to the front wheels 1.

[0037] With the configuration described above, the left and right front wheels 1 and the left and right rear wheels 2 are driven by the first motor 11. That is, the electric tractor A includes the left and right front wheels 1 driven by the first motor 11 and the left and right rear wheels 2.

[0038] The PTO shaft 28 is provided rearward at the rear part of the mission case 6. Also, the mid PTO shaft 29 is provided forward at the bottom of the mission case 6. A hydraulic multi-plate PTO clutch (not shown) and a PTO transmission system (not shown), which are transmission mechanisms, are provided inside the mission case 6.

[0039] The power of the output shaft (not shown) of the second motor 12 is transmitted to the PTO clutch, is transmitted from the PTO clutch to the PTO transmission system, and is transmitted from the PTO transmission system to the PTO shaft 28 and the mid PTO shaft 29. Note that the output shaft of the second motor 12 extends rearward.

[0040] As shown in FIG. 1, when the working device E is attached to the rear part of the machine body, the power of the PTO shaft 28 is transmitted to the working device E. Thereby, the PTO shaft 28 transmits the driving force of the second motor 12 to the working device E. In the example shown in FIG. 1, the working device E is a rotary tiller. However, the present invention is not limited to this. The working device E attached to the rear part of the machine body may be any device other than the rotary tiller.

[0041] Also, for example, when a working device E such as a mower (not shown) is attached between the front wheels 1 and the rear wheels 2 at the lower part of the machine body (in other words, at the center in the longitudinal direction of the machine body), the power of the mid PTO shaft 29 is transmitted to the working device E. However, the present invention is not limited to this. The working device E attached to the center in the longitudinal direction of the machine body may be any device other than the mower.

[0042] With the configuration described above, the PTO shaft 28 and the mid PTO shaft 29 transmit the driving force of the second motor 12 to the working device E. That is, the electric tractor A includes the PTO shaft 28 and the mid PTO shaft 29 that transmit the driving force of the second motor 12 to the working device E.

[0043] The electric tractor A can travel while driving the working device E by driving the first motor 11 and the second motor 12 simultaneously.

[0044] As shown in FIG. 2, the pipe member 30 is provided across the rear portion of the accommodation frame 5 and the front axle case 7. The pipe member 30 extends along the front-rear direction. The aforementioned front wheel drive shaft 31 is provided inside the pipe member 30. The front wheel drive shaft 31 is provided across the inside of the transmission case 6 and the front wheel differential device of the front axle case 7.

[0045] As shown in FIG. 1, the operation unit 8 is provided with a steering handle 33 for steering the front wheels 1, a driver's seat 34, a shift pedal 35, a brake pedal 36, etc. The operator can sit on the driver's seat 34. Also, when the brake pedal 36 is operated by the operator, a brake (not shown) that can brake the left and right rear wheels 2 is actuated. Thereby, the left and right rear wheels 2 receive a braking action.

[0046] A step 41 for stepping on is attached to the lower left portion of the operation unit 8. The operator uses this step 41 to get on and off the operation unit 8 mainly from the left side of the machine body.

[0047] 〔Configuration inside the bonnet〕 As shown in FIGS. 3 to 5, the electric tractor A includes an upper battery 21, a lower battery 22, a first radiator 38, a second radiator 39, a third radiator 40, a cooling fan 42, a first reserve tank 43, and a second reserve tank 44.

[0048] In addition, the electric tractor A is provided with a plurality of electrical components N. In the present embodiment, the plurality of electrical components N are specifically a charge control device 23, a junction box 24, a first control unit 25, a second control unit 26, a second battery 27, and a voltage converter 37.

[0049] The upper battery 21, the lower battery 22, the charge control device 23, the junction box 24, the first control unit 25, the second control unit 26, the second battery 27, the voltage converter 37, the first radiator 38, the second radiator 39, the third radiator 40, the cooling fan 42, the first reserve tank 43, and the second reserve tank 44 are all covered (in other words, housed) by the bonnet 15.

[0050] Both the upper battery 21 and the lower battery 22 are the first battery 10. That is, the electric tractor A is provided with a bonnet 15 that covers the first battery 10. Although not particularly limited, the specifications of the upper battery 21 and the lower battery 22 are the same as each other. In other words, the upper battery 21 and the lower battery 22 are batteries of the same type as each other.

[0051] The upper battery 21 is disposed above the lower battery 22. Thereby, the plurality of first batteries 10 are arranged in the vertical direction. More specifically, the two first batteries 10 are arranged in the vertical direction.

[0052] The lower surface of the upper battery 21 and the upper surface of the lower battery 22 are separated from each other. That is, a gap G exists between the upper battery 21 and the lower battery 22. In this way, a gap G exists between the plurality of first batteries 10.

[0053] In addition, the electric tractor A is equipped with a charging socket (not shown). When an operator or the like inserts the adapter of the charger into the charging socket, each first battery 10 is charged. The charging socket receives the power for charging each first battery 10. The specifications of the charging socket may be, for example, CHAdeMO, CCS2, GB / T, ChaoJi, NACS, etc.

[0054] The charge control device 23 may be a power module or a PLC (Programmable Logic Controller) having a microcomputer that executes a program for charging each first battery 10, or may be a relay circuit that operates based on an electrical signal. The charge control device 23 controls the charging voltage and charging current for each first battery 10 when charging each first battery 10 (including rapid charging).

[0055] The junction box 24 is electrically connected to the first battery 10, the first inverter 13, the second inverter 14, the voltage converter 37, and the charging socket. The junction box 24 functions as a hub that distributes the power from the first battery 10 to each of the first inverter 13, the second inverter 14, and the voltage converter 37. In addition, the junction box 24 receives the charging power from the charging socket and transmits it to the first battery 10.

[0056] Both the first control unit 25 and the second control unit 26 are ECUs (Electronic Control Units) that control each part of the electric tractor A. Although not particularly limited, for example, the first control unit 25 may be an ECU for controlling electric components (more specifically, for example, the cooling fan 42 and the first pump 86 and the second pump 87 described later), and the second control unit 26 may be an ECU for controlling the main machine (more specifically, for example, the first inverter 13 and the second inverter 14).

[0057] The second battery 27 is a battery for auxiliary equipment. The second battery 27 is, for example, a lead battery. The second battery 27 supplies power at a low voltage (for example, 12 volts) to drive auxiliary equipment (for example, the cooling fan 42, the first pump 86, the second pump 87, etc. described later). The output voltage of the second battery 27 is lower than the output voltage of the first battery 10. Incidentally, the second battery 27 may also supply power to ECUs such as the first control unit 25 and the second control unit 26.

[0058] Also, power is sent from the first battery 10 to the voltage converter 37. The voltage converter 37 steps down the power from the first battery 10 and supplies it to the second battery 27. Thereby, the second battery 27 can be charged.

[0059] In this way, the plurality of electrical components N includes the second battery 27 for auxiliary equipment, the voltage converter 37 that steps down the power from the first battery 10 and supplies it to the second battery 27, and the junction box 24.

[0060] The electric tractor A includes a first cooling path J1 and a second cooling path J2 through which the coolant circulates. In the first cooling path J1, the first coolant circulates. In the second cooling path J2, the second coolant circulates. That is, the electric tractor A includes the first cooling path J1 through which the first coolant circulates and the second cooling path J2 through which the second coolant circulates.

[0061] Although not particularly limited, in this embodiment, the first coolant and the second coolant are different types of coolants. Specifically, the first coolant is a known LLC (long life coolant). Also, the second coolant is an oil having insulating properties.

[0062] The first radiator 38 is included in the first cooling path J1. The first radiator 38 cools the first coolant. That is, the electric tractor A includes the first radiator 38 that is included in the first cooling path J1 and cools the first coolant.

[0063] The second radiator 39 is included in the second cooling path J2. The second radiator 39 cools the second coolant. That is, the electric tractor A is provided with the second radiator 39 that is included in the second cooling path J2 and cools the second coolant.

[0064] The third radiator 40 is included in the second cooling path J2. The third radiator 40 cools the second coolant.

[0065] The third radiator 40 is disposed below the first radiator 38. The radiator device K is constituted by the first radiator 38 and the third radiator 40. The second radiator 39 is disposed in front of the radiator device K.

[0066] The cooling fan 42 is disposed behind the first radiator 38, the second radiator 39, and the third radiator 40. The cooling fan 42 sends cooling air to the rear side. Thereby, outside air is introduced into the inside of the bonnet 15 through the above-described air introduction holes and passes through the first radiator 38, the second radiator 39, and the third radiator 40. As a result, the first radiator 38, the second radiator 39, and the third radiator 40 are cooled.

[0067] In addition, the cooling fan 42 is disposed in front of the upper battery 21 and the lower battery 22. Also, the cooling fan 42 is disposed in front of the lower battery 22.

[0068] The first reserve tank 43 is included in the first cooling path J1. The first reserve tank 43 can store the first coolant.

[0069] The second reserve tank 44 is included in the second cooling path J2. The second reserve tank 44 can store the second coolant.

[0070] As shown in FIGS. 3 to 5, the charge control device 23 and the junction box 24 are arranged on the left side of the first battery 10. The first control unit 25, the second control unit 26, the second battery 27, and the voltage converter 37 are arranged on the right side of the first battery 10. That is, the plurality of electrical components N are arranged by being distributed left and right with respect to the first battery 10. Further, the voltage converter 37 and the junction box 24 are arranged by being distributed left and right with respect to the first battery 10.

[0071] In FIGS. 3 to 5, a reference position T is shown. The reference position T is the lower end position of the upper battery 21. The charge control device 23, the second reserve tank 44, the first control unit 25, the second control unit 26, and the second battery 27 are all arranged above the reference position T. The voltage converter 37 and the junction box 24 are both arranged below the reference position T.

[0072] In this way, the plurality of electrical components N are arranged by being distributed up and down with respect to the lower end position of the upper first battery 10. Further, the voltage converter 37 and the junction box 24 are both arranged below the lower end position of the upper first battery 10.

[0073] As shown in FIG. 3, the second reserve tank 44 is located in front of the charge control device 23. As shown in FIG. 4, the second control unit 26 is located in front of the first control unit 25. Further, the second battery 27 is located in front of the second control unit 26.

[0074] 〔Support Structure of Each Member in the Bonnet〕 As shown in FIGS. 3 and 5, a first support stay 46 and a second support stay 47 are provided on the left side wall of the upper battery 21. Note that the first support stay 46 and the second support stay 47 may be part of the upper battery 21 or may not be included in the upper battery 21.

[0075] The second support stay 47 is disposed behind the first support stay 46. Further, a front support portion 44a extending forward is provided at the front end portion of the second reserve tank 44. Further, a rear support portion 44b extending rearward is provided at the rear end portion of the second reserve tank 44.

[0076] The front support portion 44a is supported by the first support stay 46 in a state of being in contact with the first support stay 46 from above. The rear support portion 44b is supported by the second support stay 47 in a state of being in contact with the second support stay 47 from above. Thereby, the second reserve tank 44 is supported by the left side wall of the upper battery 21 via the first support stay 46 and the second support stay 47.

[0077] A first plate-like member 48 is attached to the second support stay 47 by, for example, welding, bolt fastening, or the like. The first plate-like member 48 is disposed behind the second support stay 47. Further, the first plate-like member 48 is disposed in a posture facing the left side wall of the upper battery 21.

[0078] The charge control device 23 is supported by the first plate-like member 48 in a state of being in contact with the first plate-like member 48 from the left side. The charge control device 23 may be fixed to the first plate-like member 48 by, for example, bolt fastening.

[0079] As shown in FIGS. 4 and 5, a third support stay 49 and a fourth support stay 50 are provided on the right side wall of the upper battery 21. Note that the third support stay 49 and the fourth support stay 50 may be a part of the upper battery 21 or may not be included in the upper battery 21.

[0080] As shown in FIGS. 4 and 5, the electric tractor A includes a second plate-like member 51. The second plate-like member 51 has an upper portion 51a, a horizontal portion 51b, and a lower portion 51c. Both the upper portion 51a and the lower portion 51c are in a vertical posture and face the right side wall of the upper battery 21. The horizontal portion 51b is in a horizontal posture.

[0081] The lower end of the upper part 51a is connected to the left end of the horizontal part 51b. The upper end of the lower part 51c is connected to the right end of the horizontal part 51b.

[0082] The horizontal part 51b is supported by the third support stay 49 in a state of contacting the third support stay 49 from above. Thereby, the second plate-like member 51 is supported by the third support stay 49. Incidentally, the second plate-like member 51 may be fixed to the third support stay 49 by, for example, bolt fastening or the like.

[0083] The first control unit 25 and the second control unit 26 are supported by the upper part 51a in a state of contacting the upper part 51a from the right side. The first control unit 25 and the second control unit 26 may be fixed to the upper part 51a by, for example, bolt fastening or the like.

[0084] Thereby, the first control unit 25 and the second control unit 26 are supported by the right side wall of the upper battery 21 via the second plate-like member 51 and the third support stay 49.

[0085] As shown in FIGS. 4 and 5, the second battery 27 is supported by the fourth support stay 50 in a state of contacting the fourth support stay 50 from above. Thereby, the second battery 27 is supported by the right side wall of the upper battery 21 via the fourth support stay 50.

[0086] As shown in FIGS. 3 to 5, the electric tractor A includes a support mechanism W. The support mechanism W is supported by the left and right front frames 4. Both the voltage converter 37 and the junction box 24 are supported by the support mechanism W.

[0087] As shown in FIGS. 3 and 4, the cooling fan 42 and the radiator device K are supported by the left and right front frames 4.

[0088] An upper support member 52 is provided in a state spanning the upper end of the radiator device K and the upper end of the second radiator 39. Also, a lower support member 53 is provided in a state spanning the lower end of the radiator device K and the lower end of the second radiator 39. The second radiator 39 is supported by the upper support member 52 and the lower support member 53. Thereby, the second radiator 39 is supported by the radiator device K via the upper support member 52 and the lower support member 53.

[0089] The first reserve tank 43 is supported by the radiator device K in a state of being in contact with the radiator device K from above.

[0090] 〔Configuration of the support mechanism〕 As shown in FIG. 2, the electric tractor A includes a third plate-like member 54, a fifth support stay 55, and a sixth support stay 56.

[0091] The third plate-like member 54 is a plate-like member in a horizontal posture. The third plate-like member 54 is arranged in a state spanning the left front frame 4 and the right front frame 4. As shown in FIG. 5, the third plate-like member 54 is supported by the left and right front frames 4 in a state of being in contact with the left and right front frames 4 from above.

[0092] Also, as shown in FIG. 5, the electric tractor A includes a channel-shaped reinforcing frame 73. The reinforcing frame 73 is fixed to the left and right front frames 4 by, for example, welding or the like in a state of being sandwiched between the left and right front frames 4. Also, the reinforcing frame 73 is in contact with the third plate-like member 54 from below. The reinforcing frame 73 is fixed to the third plate-like member 54 by, for example, welding or the like.

[0093] Both the fifth support stay 55 and the sixth support stay 56 shown in FIG. 2 are plate-like members bent in an L-shape. The fifth support stay 55 is attached to the left front frame 4. The sixth support stay 56 is attached to the right front frame 4. The fifth support stay 55 and the sixth support stay 56 are arranged behind the third plate-like member 54.

[0094] As shown in FIGS. 6 to 8, the support mechanism W is composed of left and right support frames 58, a bottom plate portion 59, and a fourth plate-shaped member 62. That is, the support mechanism W has left and right support frames 58.

[0095] The left and right support frames 58 are composed of a left support frame 60 and a right support frame 61. The left support frame 60 is the left support frame 58 on the left side. The right support frame 61 is the right support frame 58 on the right side.

[0096] The left support frame 60 is arranged in a posture along the left side wall of the lower battery 22. The right support frame 61 is arranged in a posture along the right side wall of the lower battery 22. That is, each support frame 58 is arranged in a posture along the side wall of the lower battery 22. Further, the lower battery 22 is arranged at a position sandwiched between the left and right support frames 58.

[0097] The bottom plate portion 59 is a plate-shaped member in a horizontal posture. The left and right support frames 58 are supported by the bottom plate portion 59 in a state of being in contact with the bottom plate portion 59 from above. The left and right support frames 58 are attached to the bottom plate portion 59 by, for example, welding or bolt fastening.

[0098] As shown in FIGS. 5 and 8, a hole 59a is provided in the front portion of the bottom plate portion 59. The fourth plate-shaped member 62 is a plate-shaped member in a horizontal posture. The fourth plate-shaped member 62 is attached to the bottom surface of the bottom plate portion 59 in a state of covering the hole 59a from below by, for example, welding or bolt fastening.

[0099] As shown in FIGS. 6 and 7, the fourth plate-shaped member 62 is supported by the third plate-shaped member 54 in a state of being in contact with the third plate-shaped member 54 from above. Thereby, the front portion of the support mechanism W is supported by the left and right front frames 4 via the third plate-shaped member 54.

[0100] As shown in FIG. 5, the fourth plate-like member 62, the third plate-like member 54, and the reinforcing frame 73 are clamped together by the fixing bolt 74. Further, a bolt hole 62a is formed in the fourth plate-like member 62. The fixing bolt 74 is inserted into the bolt hole 62a. Incidentally, the number of the fixing bolts 74 and the bolt holes 62a may be any number.

[0101] As shown in FIG. 8, in a plan view, the bolt hole 62a is provided inside the hole 59a (in other words, at a position corresponding to the hole 59a).

[0102] As shown in FIGS. 6 and 7, the rear part of the support mechanism W is supported by the fifth support stay 55 and the sixth support stay 56 in a state of being in contact with the fifth support stay 55 and the sixth support stay 56 from above. Thereby, the rear part of the support mechanism W is supported by the left and right front frames 4 via the fifth support stay 55 and the sixth support stay 56.

[0103] As shown in FIGS. 6 and 8, the left support frame 60 has a first column frame 63, a second column frame 64, a first connecting frame 65, and a second connecting frame 66. Both the first column frame 63 and the second column frame 64 extend in the vertical direction. The lower end portions of the first column frame 63 and the second column frame 64 are attached to the upper surface of the bottom plate portion 59 by, for example, welding or bolt fastening. The first column frame 63 is arranged in front of the second column frame 64.

[0104] Both the first connecting frame 65 and the second connecting frame 66 extend in the front-rear direction. The first connecting frame 65 is arranged above the second connecting frame 66. The front end portion of the first connecting frame 65 is connected to the upper part of the first column frame 63. The rear end portion of the first connecting frame 65 is connected to the upper part of the second column frame 64. Further, the front end portion of the second connecting frame 66 is connected to the lower part of the first column frame 63. The rear end portion of the second connecting frame 66 is connected to the lower part of the second column frame 64. Incidentally, the first connecting frame 65 and the second connecting frame 66 are spaced apart from each other in the vertical direction.

[0105] As shown in FIGS. 7 and 8, the right support frame 61 has a third column frame 67, a fourth column frame 68, a third connecting frame 69, and a fourth connecting frame 70. Both the third column frame 67 and the fourth column frame 68 extend in the vertical direction. The lower ends of the third column frame 67 and the fourth column frame 68 are attached to the upper surface of the bottom plate portion 59 by, for example, welding or bolt fastening. The third column frame 67 is disposed on the front side of the fourth column frame 68.

[0106] Both the third connecting frame 69 and the fourth connecting frame 70 extend in the front-rear direction. The third connecting frame 69 is disposed above the fourth connecting frame 70. The front end portion of the third connecting frame 69 is connected to the upper portion of the third column frame 67. The rear end portion of the third connecting frame 69 is connected to the upper portion of the fourth column frame 68. Also, the front end portion of the fourth connecting frame 70 is connected to the lower portion of the third column frame 67. The rear end portion of the fourth connecting frame 70 is connected to the lower portion of the fourth column frame 68. Incidentally, the third connecting frame 69 and the fourth connecting frame 70 are spaced apart from each other in the vertical direction.

[0107] As shown in FIGS. 6 to 8, the first support portion S1 is constituted by the bottom plate portion 59, the first column frame 63, the second column frame 64, the third column frame 67, and the fourth column frame 68. The first support portion S1 supports the upper battery 21 and the lower battery 22. That is, the first support portion S1 supports a plurality of first batteries 10.

[0108] Specifically, as shown in FIGS. 5 to 7, the left front portion of the upper battery 21 is supported by the upper end portion of the first column frame 63 in the first support portion S1 via the first elastic member 71. The right front portion of the upper battery 21 is supported by the upper end portion of the third column frame 67 in the first support portion S1 via the first elastic member 71. The left rear portion of the upper battery 21 is supported by the upper end portion of the second column frame 64 in the first support portion S1 via the first elastic member 71. The right rear portion of the upper battery 21 is supported by the upper end portion of the fourth column frame 68 in the first support portion S1 via the first elastic member 71.

[0109] Also, the left front portion of the lower battery 22 is supported by the left front portion of the bottom plate portion 59 in the first support portion S1 via the first elastic member 71. The right front portion of the lower battery 22 is supported by the right front portion of the bottom plate portion 59 in the first support portion S1 via the first elastic member 71. The left rear portion of the lower battery 22 is supported by the left rear portion of the bottom plate portion 59 in the first support portion S1 via the first elastic member 71. The right rear portion of the lower battery 22 is supported by the right rear portion of the bottom plate portion 59 in the first support portion S1 via the first elastic member 71.

[0110] Note that the first elastic member 71 is not particularly limited, and may be, for example, a rubber mount.

[0111] As shown in FIGS. 6 to 8, the second support portion S2 is constituted by the first connection frame 65, the second connection frame 66, the third connection frame 69, and the fourth connection frame 70. The second support portion S2 supports the electrical components N (more specifically, the junction box 24 and the voltage converter 37). That is, the electric tractor A includes a support mechanism W having the first support portion S1 and the second support portion S2.

[0112] Specifically, the junction box 24 is supported by the first connection frame 65 and the second connection frame 66 in a state of being in contact with the first connection frame 65 and the second connection frame 66 from the left side in the second support portion S2. The junction box 24 is attached to the first connection frame 65 and the second connection frame 66 by, for example, bolt fastening or the like.

[0113] Further, the voltage converter 37 is supported by the third connection frame 69 and the fourth connection frame 70 in a state of being in contact with the third connection frame 69 and the fourth connection frame 70 from the right side in the second support portion S2. The voltage converter 37 is attached to the third connection frame 69 and the fourth connection frame 70 by, for example, bolt fastening or the like.

[0114] 〔Hydraulic Pump〕 As shown in FIG. 2, the electric tractor A includes a hydraulic pump 72. The hydraulic pump 72 is attached to the right rear part of the housing frame 5. The power of the output shaft (not shown) of the second motor 12 is transmitted to a power transmission gear (not shown), and is then transmitted from the power transmission gear to the input shaft (not shown) of the hydraulic pump 72. Thereby, the power of the second motor 12 is transmitted to the hydraulic pump 72. As a result, the hydraulic pump 72 is driven.

[0115] In this way, the electric tractor A includes a hydraulic pump 72 driven by the second motor 12.

[0116] In addition, the above-mentioned power transmission gear is housed in the rear part of the housing frame 5. Further, the input shaft of the hydraulic pump 72 extends forward.

[0117] The hydraulic pump 72 supplies hydraulic oil to each part of the electric tractor A. For example, when a front loader device (not shown) is attached to the machine body, the front loader device operates when hydraulic oil is supplied from the hydraulic pump 72 to the front loader device. Also, when hydraulic oil is supplied from the hydraulic pump 72 to various hydraulic devices (not shown) in the machine body, the hydraulic devices operate.

[0118] 〔Pillar Frame〕 As shown in FIGS. 1 to 3, a handle support mechanism 16 is provided at the front end of the operation unit 8. The steering handle 33 is supported by the handle support mechanism 16.

[0119] As shown in FIGS. 9 and 10, a pillar frame 18 (corresponding to the "cover support portion" according to the present invention) is provided in front of the handle support mechanism 16. As shown in FIG. 11, the pillar frame 18 is configured in an arch shape (gate shape) when viewed from the rear. The pillar frame 18 is supported by the housing frame 5 while being in contact with the housing frame 5 from above.

[0120] As shown in FIGS. 9 and 11, the electric tractor A includes a shaft support portion 75 and a shaft member 76. The shaft support portion 75 is fixed to the upper end portion of the pillar frame 18. The shaft support portion 75 extends upward from the upper end portion of the pillar frame 18.

[0121] The shaft member 76 extends in the left - right direction of the machine body. The shaft member 76 is supported by the shaft support portion 75. Thereby, the shaft member 76 is supported by the pillar frame 18 via the shaft support portion 75. That is, the shaft member 76 is supported by the pillar frame 18. Note that the number of the shaft support portion 75 and the shaft member 76 can be any number.

[0122] As shown in FIGS. 1, 9, and 11, the bonnet 15 is supported by the shaft member 76 in a state where it can swing up and down about the shaft member 76. Thereby, the bonnet 15 is supported by the pillar frame 18 via the shaft member 76 and the shaft support portion 75. Also, thereby, the bonnet 15 can be opened and closed.

[0123] That is, the electric tractor A includes a pillar frame 18 that supports the bonnet 15. Also, the bonnet 15 can be opened and closed by swinging up and down about a shaft member 76 that extends in the left - right direction of the machine body.

[0124] As shown in FIGS. 10 and 11, the electric tractor A includes a first battery support portion 77 and a second battery support portion 78. The first battery support portion 77 is disposed so as to extend between the upper left portion of the pillar frame 18 and the upper left portion of the upper battery 21. The left end portion of the first battery support portion 77 is fixed to the upper left portion of the pillar frame 18 by, for example, welding or the like. The right end portion of the first battery support portion 77 is fixed to the upper left portion of the upper battery 21 by, for example, bolt fastening or the like.

[0125] The second battery support portion 78 is disposed so as to extend between the upper right portion of the pillar frame 18 and the upper right portion of the upper battery 21. The right end portion of the second battery support portion 78 is fixed to the upper right portion of the pillar frame 18 by, for example, welding or the like. The left end portion of the second battery support portion 78 is fixed to the upper right portion of the upper battery 21 by, for example, bolt fastening or the like.

[0126] With this configuration, the upper battery 21 is supported by the pillar frame 18 via the first battery support portion 77 and the second battery support portion 78. That is, the upper battery 21 is supported by the pillar frame 18.

[0127] As shown in FIGS. 9 and 11, the electric tractor A includes a seventh support stay 79 and a second elastic member 80. The seventh support stay 79 is fixed to the upper end portion of the pillar frame 18. The seventh support stay 79 extends rearward from the upper end portion of the pillar frame 18. The second elastic member 80 is attached to the rear end portion of the seventh support stay 79. Although not particularly limited, the second elastic member 80 may be made of, for example, rubber.

[0128] As shown in FIG. 9, the second elastic member 80 is in contact with the front end portion (more specifically, the front wall) of the handle support mechanism 16. When the bonnet 15 is opened and closed, the vibration of the bonnet 15 and the pillar frame 18 accompanying the opening and closing of the bonnet 15 is suppressed by the second elastic member 80.

[0129] As shown in FIGS. 9 to 11, the electric tractor A is provided with left and right connecting portions 81. Each connecting portion 81 is provided in a state extending across the pillar frame 18 and the front end portion of the handle support mechanism 16. That is, the electric tractor A is provided with a connecting portion 81 extending across the pillar frame 18 and the operation portion 8.

[0130] Each connecting portion 81 has a first connecting portion 82, a second connecting portion 83, a third elastic member 84 (corresponding to the "vibration suppression member" according to the present invention), and a fourth elastic member 85 (corresponding to the "vibration suppression member" according to the present invention). Although not particularly limited, the third elastic member 84 and the fourth elastic member 85 may be made of rubber, for example.

[0131] The first connecting portion 82 is attached to the pillar frame 18 via the third elastic member 84. The first connecting portion 82 extends rearward from the pillar frame 18.

[0132] The second connecting portion 83 is attached to the rear end portion of the first connecting portion 82 via the fourth elastic member 85. And the second connecting portion 83 is connected to the front end portion (more specifically, the front wall) of the handle support mechanism 16 by, for example, welding or bolt fastening.

[0133] With the configuration described above, the pillar frame 18 is connected to the operation portion 8 via the left and right connecting portions 81. Note that the present invention is not limited to this, and the number of connecting portions 81 provided may be any number.

[0134] When an operator gets on and off the operation portion 8, vibration may occur in the operation portion 8. The fourth elastic member 85 suppresses the vibration transmitted from the operation portion 8 to the second connecting portion 83 from being transmitted from the second connecting portion 83 to the first connecting portion 82. As a result, the transmission of the vibration of the operation portion 8 to the pillar frame 18 is suppressed.

[0135] Further, the third elastic member 84 suppresses the vibration transmitted from the operation unit 8 to the first connection part 82 via the second connection part 83 from being transmitted from the first connection part 82 to the pillar frame 18. As a result, the vibration of the operation unit 8 is suppressed from being transmitted to the pillar frame 18.

[0136] Thus, the connection part 81 has the third elastic member 84 and the fourth elastic member 85 that suppress the vibration of the operation unit 8 from being transmitted to the pillar frame 18.

[0137] 〔First Cooling Path〕 As shown in FIGS. 3 and 4, the electric tractor A includes a first pump 86 and a second pump 87. Both the first pump 86 and the second pump 87 are disposed below the lower battery 22.

[0138] As shown in FIG. 12, the first pump 86 and the second pump 87 are included in the first cooling path J1. The first pump 86 and the second pump 87 may be configured to be driven by the electric power supplied from, for example, the second battery 27. The first pump 86 and the second pump 87 pump the first coolant.

[0139] The first cooling path J1 includes a first inverter 13, a first motor 11, a second motor 12, a second inverter 14, a voltage converter 37, a first reserve tank 43, and a first radiator 38.

[0140] That is, the voltage converter 37 is included in the first cooling path J1. Also, the first motor 11 is included in the first cooling path J1. Also, the second motor 12 is included in the first cooling path J1.

[0141] Further, the first cooling path J1 has a first path P1, a second path P2, and a third path P3. The first path P1 connects the first radiator 38 and the first motor 11. In the first path P1, the first coolant flows from the first radiator 38 toward the first motor 11.

[0142] The second path P2 connects the first motor 11 and the second motor 12. In the second path P2, the first coolant flows from the first motor 11 towards the second motor 12.

[0143] The third path P3 connects the second motor 12 and the first radiator 38. In the third path P3, the first coolant flows from the second motor 12 towards the first radiator 38.

[0144] That is, the first cooling path J1 includes the first radiator 38 that cools the first coolant, the first path P1 through which the first coolant flows from the first radiator 38 towards the first motor 11, the second path P2 through which the first coolant flows from the first motor 11 towards the second motor 12, and the third path P3 through which the first coolant flows from the second motor 12 towards the first radiator 38.

[0145] The first path P1 will be described in detail. The first path P1 includes the first hose 96, the first pump 86, the second hose 88, the second pump 87, the third hose 89, the first inverter 13, and the fourth hose 90. That is, the first inverter 13 is included in the first path P1.

[0146] The first hose 96 connects the first radiator 38 and the first pump 86. The second hose 88 connects the first pump 86 and the second pump 87. The third hose 89 connects the second pump 87 and the first inverter 13. The fourth hose 90 connects the first inverter 13 and the first motor 11.

[0147] As shown in FIGS. 3, 4, and 13, a part of the first hose 96 and a part of the third hose 89 are located below the upper battery 21 and the lower battery 22. Also, the first pump 86, the second hose 88, and the second pump 87 are located below the upper battery 21 and the lower battery 22. Thus, at least a part of the first path P1 is located below the first battery 10. Note that only a part of the first path P1 may be located below the first battery 10, or the entire first path P1 may be located below the first battery 10.

[0148] The second path P2 will be described in detail. As shown in FIG. 12, the second path P2 is constituted by the fifth hose 91. The fifth hose 91 connects the first motor 11 and the second motor 12.

[0149] The third path P3 will be described in detail. The third path P3 includes the sixth hose 92, the second inverter 14, the seventh hose 93, the voltage converter 37, the eighth hose 94, the first reserve tank 43, and the ninth hose 95. That is, the second inverter 14 is included in the third path P3.

[0150] As shown in FIGS. 3, 4, and 13, a part of the seventh hose 93 and a part of the eighth hose 94 are located to the right of the lower battery 22. Also, a part of the eighth hose 94 is located to the right of the upper battery 21. Further, the voltage converter 37 is located to the right of the lower battery 22.

[0151] Thereby, at least a part of the third path P3 is located to the right of the first battery 10. Note that the present invention is not limited thereto. For example, the arrangements of the seventh hose 93, the eighth hose 94, and the voltage converter 37 may be reversed in the left - right direction. That is, at least a part of the third path P3 is located to the left or right of the first battery 10. Note that only a part of the third path P3 may be located to the left or right of the first battery 10, or the entire third path P3 may be located to the left or right of the first battery 10.

[0152] As shown in FIG. 12, the first pump 86 and the second pump 87 are connected in series by the second hose 88. Then, the first coolant pumped by the first pump 86 and the second pump 87 flows in the order of the third hose 89, the first inverter 13, the fourth hose 90, the first motor 11, the fifth hose 91, the second motor 12, the sixth hose 92, the second inverter 14, the seventh hose 93, the voltage converter 37, the eighth hose 94, the first reserve tank 43, the ninth hose 95, the first radiator 38, and the first hose 96, and returns to the first pump 86 and the second pump 87.

[0153] In FIGS. 3, 4, and 13, illustration of the ninth hose 95 is omitted. Instead of providing the ninth hose 95, the first reserve tank 43 and the first radiator 38 may be directly connected.

[0154] [Second Cooling Path] As shown in FIGS. 3 and 4, the electric tractor A includes a third pump 17 and a battery heater 19. The third pump 17 is disposed below the radiator device K and the second radiator 39. The battery heater 19 is disposed below the lower battery 22.

[0155] As shown in FIG. 12, the third pump 17 and the battery heater 19 are included in the second cooling path J2. The third pump 17 may be configured to be driven by, for example, electric power supplied from the second battery 27. The third pump 17 pumps the second coolant.

[0156] Further, the battery heater 19 may be configured to be driven by, for example, electric power supplied from the second battery 27. The battery heater 19 heats the second coolant when the upper battery 21 and the lower battery 22 are in a low temperature state.

[0157] The second cooling path J2 includes the upper battery 21, the lower battery 22, the third radiator 40, the second radiator 39, and the second reserve tank 44. That is, the first battery 10 is included in the second cooling path J2.

[0158] Further, the second cooling path J2 includes the tenth hose 97, the eleventh hose 98, the twelfth hose 99, the thirteenth hose 100, the fourteenth hose 101, the fifteenth hose 102, and the sixteenth hose 103.

[0159] The tenth hose 97 connects the third pump 17 and the battery heater 19. The eleventh hose 98 connects the battery heater 19 and the upper battery 21. The twelfth hose 99 connects the upper battery 21 and the lower battery 22. The thirteenth hose 100 connects the lower battery 22 and the third radiator 40. The fourteenth hose 101 connects the third radiator 40 and the second radiator 39. The fifteenth hose 102 connects the second radiator 39 and the second reserve tank 44. The sixteenth hose 103 connects the second reserve tank 44 and the third pump 17.

[0160] As shown in FIGS. 3, 4, and 13, a part of the fifteenth hose 102 and a part of the sixteenth hose 103 are located to the left of the upper battery 21. Also, a part of the sixteenth hose 103 is located to the left of the lower battery 22. Further, the second reserve tank 44 is located to the left of the upper battery 21.

[0161] Thereby, at least a part of the second cooling path J2 is located to the left of the first battery 10. Note that the present invention is not limited to this. For example, the arrangements of the fifteenth hose 102, the sixteenth hose 103, and the second reserve tank 44 may be reversed in the left - right direction.

[0162] With the configuration described above, at least a part of the first cooling path J1 (more specifically, the third path P3) passes through one side (the right side in this embodiment) of the first battery 10 in the left - right direction. Also, at least a part of the second cooling path J2 passes through the other side (the left side in this embodiment) of the first battery 10 in the left - right direction.

[0163] Note that only a part of the first cooling path J1 may pass through one side of the first battery 10 in the left - right direction, or the entire first cooling path J1 may pass through one side of the first battery 10 in the left - right direction. Also, only a part of the second cooling path J2 may pass through the other side of the first battery 10 in the left - right direction, or all of the portion of the second cooling path J2 excluding the first battery 10 may pass through the other side of the first battery 10 in the left - right direction.

[0164] As shown in FIG. 12, the second coolant pumped by the third pump 17 flows in the order of the tenth hose 97, the battery heater 19, the eleventh hose 98, the upper battery 21, the twelfth hose 99, the lower battery 22, the thirteenth hose 100, the third radiator 40, the fourteenth hose 101, the second radiator 39, the fifteenth hose 102, the second reserve tank 44, and the sixteenth hose 103, and returns to the third pump 17.

[0165] As shown in FIG. 12, the first cooling path J1 and the second cooling path J2 do not communicate with each other. That is, the first cooling path J1 and the second cooling path J2 are independent of each other.

[0166] According to the configuration described above, the first battery 10 (more specifically, the upper battery 21) is supported by the pillar frame 18. Here, the pillar frame 18 is configured to be strong enough to support the bonnet 15. Therefore, the first battery 10 (more specifically, the upper battery 21) is stably supported by the pillar frame 18.

[0167] That is, according to this configuration, an electric tractor A in which the first battery 10 is stably supported can be realized.

[0168] 〔First Alternative Embodiment〕 In the first cooling path J1 of the above embodiment, the first coolant circulates in the direction shown in FIG. 12.

[0169] However, the present invention is not limited to this. Hereinafter, the first alternative embodiment according to the present invention will be described centering on the points different from the above embodiment. The configuration other than the parts described below is the same as that of the above embodiment. Also, the same components as those in the above embodiment are denoted by the same reference numerals.

[0170] In the first cooling path J1 of the first alternative embodiment according to the present invention, the pumping direction of the first coolant by the first pump 86 and the second pump 87 is reversed from that of the above embodiment. As a result, the first coolant circulates in the direction shown in FIG. 14.

[0171] Specifically, in the first path P1, the first coolant flows from the first motor 11 toward the first radiator 38. Also, in the second path P2, the first coolant flows from the second motor 12 toward the first motor 11. Further, in the third path P3, the first coolant flows from the first radiator 38 toward the second motor 12.

[0172] That is, the first cooling path J1 includes a first radiator 38 that cools the first coolant, a first path P1 through which the first coolant flows from the first motor 11 toward the first radiator 38, a second path P2 through which the first coolant flows from the second motor 12 toward the first motor 11, and a third path P3 through which the first coolant flows from the first radiator 38 toward the second motor 12.

[0173] Also, in response to a predetermined manual operation by the operator or automatically, the circulation direction of the first coolant may be switchable between the direction shown in FIG. 12 and the direction shown in FIG. 14. That is, the circulation direction of the first coolant may be changeable.

[0174] 〔Other Embodiments〕 (1) The arrangement of some or all of the members may be reversed in the left - right direction.

[0175] (2) The electric tractor A may be equipped with an engine and configured in a hybrid manner.

[0176] (3) The number of the first batteries 10 provided may be one.

[0177] (4) The second motor 12 may not be provided.

[0178] (5) The left - right connecting portions 81 may not be provided.

[0179] (6) The third elastic member 84 may not be provided.

[0180] (7) The fourth elastic member 85 may not be provided.

[0181] (8) The bonnet 15 may be configured not to be openable and closable.

[0182] (9) The shaft member 76 may be fixed to the bonnet 15. In this case, with respect to the shaft support portion 75, the bonnet 15 and the shaft member 76 rotate integrally, and the bonnet 15 may be swingable up and down about the shaft member 76. Alternatively, the shaft member 76 may be fixed to the shaft support portion 75.

[0183] In addition, the configurations disclosed in the above-described embodiments (including other embodiments, the same applies hereinafter) can be applied in combination with the configurations disclosed in other embodiments as long as no contradiction occurs. Also, the embodiments disclosed in this specification are examples, and the embodiments of the present invention are not limited thereto, and can be appropriately modified within the scope not departing from the object of the present invention.

Industrial Applicability

[0184] The present invention can be used for an electric tractor.

Explanation of Signs

[0185] 1: Front wheel (traveling device) 2: Rear wheel (traveling device) 8: Driver's cab 10: First battery (battery) 11: First motor (motor) 15: Bonnet (cover member) 18: Pillar frame (cover support portion) 76: Shaft member 81: Connecting portion 84: Third elastic member (vibration suppression member) 85: Fourth elastic member (vibration damping member) A: Electric tractor

Claims

1. A battery disposed at the front of the body, a motor driven by electric power supplied from the battery, a traveling device driven by the motor, a cover member covering the battery, and a cover support portion supporting the cover member, wherein the battery is supported by the cover support portion, an electric tractor.

2. a driver's cab where a passenger can board, and a connecting portion extending between the cover support portion and the driver's cab, wherein the cover support portion is connected to the driver's cab via the connecting portion, the electric tractor according to Claim 1.

3. The connecting portion has a vibration suppression member that suppresses transmission of vibration of the driver's cab to the cover support portion, the electric tractor according to Claim 2.

4. The cover member is openable and closable, the electric tractor according to any one of Claims 1 to 3.

5. The cover member is openable and closable by swinging up and down about a shaft member extending in the left - right direction of the body, wherein the shaft member is supported by the cover support portion, the electric tractor according to Claim 4.

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