Electric tractor

Abstract

This electric tractor comprises, side by side along a left-right direction: a first electric motor 11 for generating power for travel; and a second electric motor 12 for generating power for operating a work device. A hydraulic pump 61 for supplying hydraulic oil to the work device is provided on the same side as the second electric motor 12 in a plan view, relative to a virtual line L4 that passes, along a front-rear direction, between the first electric motor 11 and the second electric motor 12. The hydraulic pump is driven by the second electric motor 12.

Description

electric tractor

[0001] The present invention relates to the overall configuration of an electric tractor.

[0002] As disclosed in Patent Document 1, some tractors are provided with an engine as a power source. In Patent Document 1, a driver's section in which an operator sits is provided on a body provided with front and rear wheels. The engine is provided in front of the driver's section, a front axle case to which the front wheels are attached is provided below the engine, and a transmission case to which the rear wheels are attached is provided below the driver's section. A transmission shaft is connected between the engine and the transmission case, and a front wheel transmission shaft is connected between the transmission case and the front axle case.

[0003] In Patent Document 1, engine power is transmitted via a transmission shaft to a travel transmission inside a transmission case, and then from the transmission to the rear wheels. Power branched from the transmission is transmitted to the front wheels via a front wheel transmission shaft. Inside the transmission case, the engine power is branched and transmitted to a PTO shaft, and the power of the PTO shaft is transmitted to a work implement equipped on the tractor. A hydraulic pump is driven by the engine power, and hydraulic oil from the hydraulic pump is supplied to hydraulic equipment provided on the tractor and to hydraulically operated work implements equipped on the tractor.

[0004] Japanese Patent Application Publication No. 2011-88523

[0005] In the field of tractors, electric tractors have been proposed that are equipped with an electric motor that generates power for traveling and an electric motor that generates power and hydraulic pressure to operate the equipped working implements. The object of the present invention is to provide a configuration for an electric tractor that allows for appropriate traveling and operation of the working implements.

[0006] The electric tractor of the present invention is provided with a first electric motor that generates power for traveling and a second electric motor that generates power to operate an equipped working device, the first electric motor and the second electric motor being arranged side by side in the left-right direction, and a hydraulic pump that supplies hydraulic oil to the working device, the hydraulic pump being arranged on the same side as the second electric motor in a plan view with respect to an imaginary line that passes between the first electric motor and the second electric motor in the front-to-rear direction, and being driven by the second electric motor.

[0007] According to the present invention, the electric tractor is driven by the power of the first electric motor, and the working device is operated by the power of the second electric motor. By separately providing the first electric motor for driving and the second electric motor for operating the working device, the working device can be operated with less influence from fluctuations in load during driving, and the electric tractor can be driven with less influence from fluctuations in load on the working device.

[0008] According to the present invention, the first electric motor and the second electric motor are arranged side by side in the left-right direction, so that the first electric motor and the second electric motor are arranged at approximately the same position in the front-to-rear direction and at approximately the same height in the up-to-down direction, thereby achieving a favorable weight balance in the electric tractor and improving the driving performance of the electric tractor.

[0009] According to the present invention, a hydraulic pump is provided, and when a hydraulically operated working implement is installed on an electric tractor, hydraulic oil from the hydraulic pump is supplied to the working implement. According to the present invention, the hydraulic pump is driven by a second electric motor for operating the working implement, so the electric tractor can travel with little effect from fluctuations in the drive load of the hydraulic pump.

[0010] According to the present invention, the hydraulic pump is provided on the same side as the second electric motor in a plan view with respect to an imaginary line that passes between the first electric motor and the second electric motor in the fore-and-aft direction, and the hydraulic pump is provided in a position close to the second electric motor, so that the drive structure of the hydraulic pump by the second electric motor can be configured compactly.

[0011] In the present invention, it is preferable that a control valve is provided to which hydraulic oil from the hydraulic pump is supplied and which supplies and discharges hydraulic oil to and from the installed working device, and that the control valve is provided on the same side as the second electric motor in a plan view with respect to the virtual line.

[0012] According to the present invention, hydraulic oil from the hydraulic pump is supplied to the control valve, and the control valve controls the supply and discharge of hydraulic oil to and from the working device, thereby operating the working device. In this case, the control valve is provided on the same side as the second electric motor in a plan view with respect to an imaginary line that passes between the first electric motor and the second electric motor in the front-to-rear direction, and the control valve is provided in a position close to the hydraulic pump, so that the oil passage connecting the hydraulic pump and the control valve can be configured compactly.

[0013] In the present invention, the device is provided with a driving unit on which an operator sits, and an manual operating device that can be operated by the operator of the driving unit and operates the control valve, and it is preferable that the manual operating device is provided on the same side as the second electric motor in a planar view relative to the left-right center of the driving unit.

[0014] According to the present invention, an operator of the operating unit can operate the control valve and activate the working device by operating the manual operating device. In this case, the manual operating device is provided on the same side as the second electric motor in a plan view with respect to the center of the operating unit, and the manual operating device is provided in a position close to the control valve, so that the wiring and linking mechanism connecting the manual operating device and the control valve can be configured compactly.

[0015] In the present invention, it is preferable that the manual operating device is provided on the right side of the left-right center of the driving unit in a planar view, and the second electric motor and the hydraulic pump are provided on the right side of the virtual line in a planar view.

[0016] Since most people are right-handed, the manual operating device is often provided on the right side of the left-right center of the driving unit in a plan view. According to the present invention, the second electric motor and the hydraulic pump are provided on the right side of an imaginary line that passes between the first electric motor and the second electric motor in the front-to-rear direction in a plan view, which is suitable for an electric tractor in which the manual operating device is provided on the right side of the left-to-right center of the driving unit in a plan view.

[0017] In the present invention, it is preferable that a transmission case is provided in which a transmission mechanism for transmitting the power of the first electric motor and the second electric motor is installed, the transmission case is installed behind the first electric motor and the second electric motor, and the hydraulic pump is installed laterally outward on the right or left side of the transmission case on the same side as the second electric motor.

[0018] According to the present invention, the transmission case is provided behind the first electric motor and the second electric motor, and the hydraulic pump is provided laterally outward on the right or left side of the transmission case on the same side as the second electric motor, thereby allowing the hydraulic pump to be provided compactly.

[0019] In the present invention, it is preferable that a storage frame is provided that houses the first electric motor and the second electric motor and has a left-right width greater than the left-right width of the transmission case, the transmission case is connected to the rear of the storage frame, and the hydraulic pump is provided behind the right or left part of the rear of the storage frame on the same side as the second electric motor.

[0020] According to the present invention, an accommodation frame is provided that accommodates the first electric motor and the second electric motor, and a transmission case is connected to the rear of the accommodation frame. The accommodation frame is configured to have sufficient strength because it accommodates the first electric motor and the second electric motor, which are heavy objects. The transmission case is also configured to have sufficient strength. According to the present invention, the transmission case is connected to the rear of the accommodation frame, and the connection between the accommodation frame, which has sufficient strength, and the transmission case, which also has sufficient strength, improves the overall rigidity of the electric tractor.

[0021] According to the present invention, the storage frame accommodates the first electric motor and the second electric motor arranged side by side in the left-right direction, so the length of the storage frame in the front-rear direction is kept small, but the width of the storage frame in the left-right direction is large, and is greater than the width of the transmission case in the left-right direction.

[0022] According to the present invention, the hydraulic pump is provided laterally outward of the right or left section of the transmission case on the same side as the second electric motor, and is also provided rearward of the right or left section of the rear of the storage frame on the same side as the second electric motor. This allows the hydraulic pump to be provided in a region between the right section (left section) of the rear of the storage frame and the right section (left section) of the transmission case, making it possible to provide the hydraulic pump in a compact manner.

[0023] In the present invention, a control valve is provided to which hydraulic oil from the hydraulic pump is supplied and which operates the supply and discharge of hydraulic oil to the installed working device, and it is preferable that the control valve is provided laterally outward on the right or left side of the storage frame on the same side as the second electric motor.

[0024] According to the present invention, hydraulic oil from the hydraulic pump is supplied to the control valve, and the control valve controls the supply and discharge of hydraulic oil to the working device, thereby operating the working device. In this case, the control valve is provided laterally outward on the right or left side of the accommodation frame on the same side as the second electric motor, and is provided in a position close to the hydraulic pump, so that the oil passage connecting the hydraulic pump and the control valve can be configured compactly.

[0025] In the present invention, it is preferable that a filter is provided on the outer side of the right or left side of the transmission case opposite the second electric motor, and that the lubricating oil stored in the transmission case is supplied to the hydraulic pump through the filter.

[0026] According to the present invention, lubricating oil stored in the transmission case is supplied as hydraulic oil to the hydraulic pump through a filter. In this case, the hydraulic pump is provided laterally outward on the right or left side of the transmission case, on the same side as the second electric motor. In addition, the filter is provided laterally outward on the right or left side of the transmission case, on the opposite side from the second electric motor. As a result, the hydraulic pump and the filter are provided separately on the right and left sides of the transmission case, allowing the hydraulic pump and the filter to be provided compactly.

[0027] In the present invention, it is preferable that a filter is provided laterally outward of the right or left part of the transmission case opposite the second electric motor, and behind the right or left part of the rear part of the accommodating frame opposite the second electric motor, and that the lubricating oil stored in the transmission case is supplied to the hydraulic pump through the filter.

[0028] According to the present invention, lubricating oil stored in the transmission case is supplied as hydraulic oil to the hydraulic pump through a filter. In this case, the hydraulic pump is provided laterally outward from the right or left section of the transmission case on the same side as the second electric motor, and is provided rearward from the right or left section of the rear part of the storage frame on the same side as the second electric motor. In addition, a filter is provided laterally outward from the right or left section of the transmission case on the opposite side from the second electric motor, and is provided rearward from the right or left section of the rear part of the storage frame on the opposite side from the second electric motor.

[0029] As a result, the hydraulic pump and the filter are provided separately on the right and left sides of the transmission case, allowing the hydraulic pump and the filter to be provided compactly.The hydraulic pump is provided in the area between the right section (left section) of the rear of the accommodation frame and the right section (left section) of the transmission case, and the filter is provided in the area between the left section (right section) of the rear of the accommodation frame and the left section (right section) of the transmission case, allowing the hydraulic pump and the filter to be provided compactly.

[0030] In the present invention, it is preferable that a supply oil passage is provided that is connected between the filter and the hydraulic pump and supplies the lubricating oil stored in the transmission case to the hydraulic pump as hydraulic oil, and that the supply oil passage is provided above the transmission case along the left-right direction.

[0031] According to the present invention, when the oil supply passage is connected between the filter and the hydraulic pump, the oil supply passage is provided above the transmission case along the left-right direction, which reduces the chance of small stones or other objects being thrown up when the electric tractor is running hitting the oil supply passage, thereby preventing damage to the oil supply passage.

[0032] FIG. 1 is a right side view of an electric tractor. FIG. 2 is a plan view of the vicinity of the front frame, storage frame and transmission case. FIG. 3 is a plan view of the storage frame. FIG. 4 is a bottom view of the storage frame. FIG. 5 is a front view of the storage frame. FIG. 6 is a rear view of the storage frame. FIG. 7 is an exploded perspective view of the storage frame. FIG. 8 is a schematic plan view showing the transmission system inside the transmission case. FIG. 9 is a rear view showing the transmission system inside the transmission case. FIG. 10 is a cross-sectional plan view of the vicinity of the first part of the transmission case and the rear part of the storage frame. FIG. 11 is a right side view showing the transmission system inside the transmission case. FIG. 12 is a left side view showing the transmission system inside the transmission case.

[0033] Figures 1 to 12 show an electric tractor, and in Figures 1 to 12, F indicates the forward direction, B indicates the backward direction, U indicates the upward direction, D indicates the downward direction, R indicates the rightward direction, and L indicates the leftward direction.

[0034] 1 and 2, right and left front wheels 1 are provided at the front of a machine body 3, and right and left rear wheels 2 are provided at the rear of the machine body 3, and the machine body 3 is supported by the front wheels 1 and the rear wheels 2. In this case, the rear wheels 2 serve as the rear traveling device.

[0035] The machine body 3 has a front frame 4, a housing frame 5, and a transmission case 6. The front frame 4 is connected to a front portion 14 of the housing frame 5, and the transmission case 6 is connected to a rear portion 15 of the housing frame 5, thereby forming the machine body 3. A first electric motor 11 and a second electric motor 12 are housed in the housing frame 5 as power sources.

[0036] A front axle case 7 is attached to the front frame 4, and right and left front wheels 1 are attached to the front axle case 7. Right and left rear wheels 2 are attached to a transmission case 6.

[0037] A driver's section 8, in which an operator sits, is provided across the housing frame 5 and the transmission case 6. A ROP frame 9 is attached to the transmission case 6, extends upward, and is provided behind the driver's section 8. A battery 10 that supplies power to electric motors 11, 12 is attached to the front frame 4, and a hood 13 is provided to cover the battery 10.

[0038] 1 , the driving section 8 is provided with a steering wheel 33, a driver's seat 34, a speed change pedal 35, right and left brake pedals 36, and a floor 38. The floor 38 is provided below the driving section 8, and is supported by the housing frame 5, with the rear of the driving section 8 being supported by the transmission case 6.

[0039] A steering handle 33 for steering the front wheels 1 is provided in front of the driving section 8, a driver's seat 34 is provided in the rear of the driving section 8, a speed change pedal 35 is provided on the right side of the floor 38, and right and left brake pedals 36 are provided on the left side of the steering handle 33.

[0040] 3 to 7 , the storage frame 5 has a front portion 14, a rear portion 15, a right lateral portion 16, a left lateral portion 16, and frames 17, 19, 20, and 21. In this case, the rear portion 15 of the storage frame 5 serves as the connecting portion. The right lateral portion 16 of the storage frame 5 serves as the right portion of the storage frame 5, and the left lateral portion 16 of the storage frame 5 serves as the left portion of the storage frame 5.

[0041] The front section 14 and the rear section 15 are configured as flat plates extending in the up-down and left-right directions. The right and left lateral sections 16 are configured as flat plates extending in the up-down and front-rear directions, but are slightly curved. The front sections of the lateral sections 16 are connected to the right and left sections of the rear surface of the front section 14, and the rear sections of the lateral sections 16 are connected to the right and left sections of the front surface of the rear section 15.

[0042] A frame 17 is connected in the front-to-rear direction across the left-to-right central portion of the upper part of the rear surface of the front section 14 and the left-to-right central portion of the upper part of the front surface of the rear section 15. A frame 19 is connected in the left-to-right direction across the upper parts of the right and left lateral sections 16. A bracket 22 is connected between the frame 17 and the frame 19.

[0043] The right and left frames 20 are connected in the front-to-rear direction to lower portions of the right and left lateral portions 16. A frame 21 is connected in the left-to-right direction across the right and left frames 20.

[0044] 3 to 7, the electric motors 11, 12 are arranged side by side in the left-right direction inside the storage frame 5 (between the front portion 14 and the rear portion 15, between the right and left lateral portions 16, and between the frames 17, 19 and the frame 21). The electric motors 11, 12 are identical and have the same output.

[0045] 6 and 7, right and left openings 15a are formed in the right and left portions of the rear portion 15 of the storage frame 5, and an opening 15b is formed in the left-right center portion of the rear portion 15 of the storage frame 5. A ring-shaped recess 15c is formed in the front portion of the rear portion 15 of the storage frame 5, concentric with the opening 15a of the rear portion 15 of the storage frame 5. In this case, opening 15b serves as a front wheel transmission opening.

[0046] 10 , flange portions 11a, 12a and output shafts 11b, 12b are provided at the rear ends of the electric motors 11, 12. Ring-shaped protrusions 11c, 12c are formed on the flange portions 11a, 12a of the electric motors 11, 12 concentrically with the output shafts 11b, 12b of the electric motors 11, 12. In this case, the flange portions 11a, 12a of the electric motors 11, 12 form the rear portions of the electric motors 11, 12.

[0047] The protrusions 11c, 12c of the electric motors 11, 12 are fitted into the recesses 15c of the rear part 15 of the accommodating frame 5 (spigot joint structure). A sealing member 18 such as an O-ring is provided between the protrusions 11c, 12c of the electric motors 11, 12 and the recesses 15c of the rear part 15 of the accommodating frame 5.

[0048] In the above-described state, the flange portion 11a of the electric motor 11 is connected to the left portion of the front surface of the rear portion 15 of the storage frame 5, and the flange portion 12a of the electric motor 12 is connected to the right portion of the front surface of the rear portion 15 of the storage frame 5. As shown in Figures 6 and 10, the output shafts 11b and 12b of the electric motors 11 and 12 are provided at positions facing the opening 15a of the rear portion 15 of the storage frame 5 and point rearward.

[0049] As shown in Figures 2 and 10, when an imaginary line L4 is assumed to pass between the electric motors 11 and 12 in the front-to-rear direction in the storage frame 5, the electric motor 11 is provided on the left side of the imaginary line L4 in a plan view, and the electric motor 12 is provided on the right side of the imaginary line L4 in a plan view.

[0050] (Configuration of mounting portion and inverter for mounting working device) As shown in Figures 3 to 7, on the right and left horizontal portions 16 of the storage frame 5, upper mounting portions 16a are provided on the upper front portion of the horizontal portion 16, facing diagonally upward, and lower mounting portions 16a are provided on the lower front portion of the horizontal portion 16, facing diagonally downward.

[0051] The right mounting portion 23 is connected across the mounting portion 16 a of the right horizontal portion 16 of the storage frame 5, and the left mounting portion 23 is connected across the mounting portion 16 a of the left horizontal portion 16 of the storage frame 5. As will be described later, a work device such as a front loader device 65 (see FIG. 1 ) is attached to the right and left mounting portions 23.

[0052] As shown in Figure 2, right and left inverters 24 are attached to the right and left lateral portions 16 of the storage frame 5, and are provided behind the attachment portion 23. Power from the battery 10 is supplied to the left inverter 24, and based on operation of the speed change pedal 35 (see Figure 1), the left inverter 24 converts the DC power of the battery 10 into AC power and supplies it to the electric motor 11, causing the electric motor 11 to operate in the forward direction and the reverse direction.

[0053] The power of the battery 10 is supplied to the right inverter 24, which converts the DC power of the battery 10 into AC power and supplies it to the electric motor 12, thereby operating the electric motor 12. The electric motor 12 drives the hydraulic pump 61 as described below, and therefore operates in the forward direction and does not operate in the reverse direction.

[0054] 2, the transmission case 6 has a first portion 6a, a second portion 6b, a third portion 6c, and right and left rear axle cases 6d. The rear axle cases 6d are provided on the third portion 6c, and the right and left rear wheels 2 are attached to the rear axle cases 6d. In this case, the first portion 6a and the second portion 6b of the transmission case 6 form the front portion of the transmission case 6, and the third portion 6c of the transmission case 6 forms the rear portion of the transmission case 6.

[0055] A first portion 6a of the transmission case 6 is connected to the rear surface of the rear portion 15 of the accommodating frame 5, and the transmission case 6 is provided rearward of the electric motors 11, 12. The first portion 6a of the transmission case 6 is open toward the front, and by connecting the first portion 6a of the transmission case 6 to the rear surface of the rear portion 15 of the accommodating frame 5, the first portion 6a of the transmission case 6 is closed by the rear portion 15 of the accommodating frame 5.

[0056] The left-right width W4 of the housing frame 5 is greater than the left-right widths W1, W2, and W3 of the transmission case 6. The left-right width W1 of the first portion 6a of the transmission case 6 is greater than the left-right width W2 of the second portion 6b of the transmission case 6. The left-right width W2 of the second portion 6b of the transmission case 6 is greater than the left-right width W3 of the third portion 6c of the transmission case 6.

[0057] 8 and 9 , lubricating oil is stored inside the transmission case 6. A hydraulic multi-plate traveling clutch 39 and a hydraulic multi-plate PTO clutch 40 are provided in the right and left portions of the second portion 6 b of the transmission case 6.

[0058] The travel transmission shaft 41, the PTO transmission shaft 42, and the front wheel transmission shaft 31 are provided in the longitudinal direction at the left-right central portion of the transmission case 6 across the second portion 6b and the third portion 6c of the transmission case 6.

[0059] A travel relay shaft 43 is provided along the front-to-rear direction on the left side of the second portion 6b of the transmission case 6. A gear-type transmission 44 is provided on the left side of the second portion 6b of the transmission case 6. A rear wheel differential device 45 is provided on the third portion 6c of the transmission case 6.

[0060] A PTO shaft 28 (see FIGS. 1 and 2) is provided facing rearward at the rear end of the third portion 6 c of the transmission case 6. A mid-PTO shaft 29 (see FIG. 1) is provided facing forward at the bottom of the third portion 6 c of the transmission case 6.

[0061] As will be described later, the power of the electric motor 11 is transmitted to the traveling clutch 39, and then transmitted from the traveling clutch 39 to the rear wheels 2 via the traveling relay shaft 43, the transmission 44, the traveling transmission shaft 41, and the rear wheel differential device 45. The power branched between the transmission 44 and the rear wheel differential device 45 is transmitted to the front wheel transmission shaft 31, and then from the front wheel transmission shaft 31 to the front wheels 1.

[0062] The power of the electric motor 12 is transmitted to the PTO clutch 40, and then transmitted from the PTO clutch 40 to the PTO shaft 28 via a PTO transmission shaft 42. The power branched from the PTO transmission shaft 42 is transmitted to the mid-PTO shaft 29.

[0063] (Connection configuration between electric motor and running clutch and PTO clutch) As shown in Figures 8, 9, and 10, the input shaft 25 is connected to the running clutch 39, the input shaft 26 is connected to the PTO clutch 40, and the input shafts 25 and 26 extend forward from the first part 6a of the transmission case 6.

[0064] An input shaft 25 passes through a left opening 15a in the rear portion 15 of the storage frame 5 and is connected to the output shaft 11b of the electric motor 11 by a spline structure. An input shaft 26 passes through a right opening 15a in the rear portion 15 of the storage frame 5 and is connected to the output shaft 12b of the electric motor 12 by a spline structure.

[0065] As a result, the power of the output shaft 11b of the electric motor 11 is transmitted to the traveling clutch 39 via the input shaft 25. The power of the output shaft 12b of the electric motor 12 is transmitted to the PTO clutch 40 via the input shaft 26.

[0066] Bearing portions 27 having bearings are provided in the right and left openings 15a of the rear portion 15 of the storage frame 5. The input shafts 25, 26 pass through and are supported by the bearing portions 27, and are supported by the rear portion 15 of the storage frame 5 via the bearing portions 27. Seal members 37 are provided in the bearing portions 27, and seal members 46 are provided on the output shafts 11b, 12b of the electric motors 11, 12.

[0067] As a result, even if the lubricating oil in the transmission case 6 tries to enter the space between the recess 15c in the rear part 15 of the accommodating frame 5 and the protrusions 11c, 12c of the electric motors 11, 12 through the opening 15a and bearing part 27 in the rear part 15 of the accommodating frame 5, it is blocked by the sealing member 37.

[0068] Even if the lubricating oil in the transmission case 6 enters the aforementioned space, the sealing member 18 prevents the lubricating oil in the transmission case 6 from escaping from the aforementioned space to the outside, and the sealing member 46 prevents the lubricating oil from entering the interior of the electric motors 11 and 12.

[0069] (Configuration of the transmission system to the rear wheels in the transmission case) - 1 As shown in Figures 8 and 9, the travel transmission shaft 41, the PTO transmission shaft 42, the front wheel transmission shaft 31, and the mid-PTO shaft 29 are arranged in a vertical line along an imaginary line L3 set in the vertical direction in the center of the left and right of the transmission case 6.

[0070] Of the traveling transmission shaft 41, the PTO transmission shaft 42, the front wheel transmission shaft 31, and the mid-PTO shaft 29, the traveling transmission shaft 41 is provided at the highest position. The PTO transmission shaft 42 is provided below the traveling transmission shaft 41, the front wheel transmission shaft 31 is provided below the PTO transmission shaft 42, and the mid-PTO shaft 29 is provided below the front wheel transmission shaft 31.

[0071] Assume that an imaginary line L1 extends rearward from the output shaft 11b (input shaft 25) of the electric motor 11, and an imaginary line L2 extends rearward from the output shaft 12b (input shaft 26) of the electric motor 12. The travel transmission shaft 41, the PTO transmission shaft 42, the front wheel transmission shaft 31, and the mid PTO shaft 29 are located between the imaginary lines L1 and L2 in a plan view (rear view). In this case, the imaginary line L1 is the first imaginary line, and the imaginary line L2 is the second imaginary line.

[0072] The traveling relay shaft 43 is provided at a height between the traveling transmission shaft 41 and the PTO transmission shaft 42, and is provided between the imaginary line L1 and the imaginary line L2 in a plan view (rear view), and is provided between the imaginary line L1 and the traveling transmission shaft 41 in a plan view (rear view).

[0073] 8, 9, and 11, the transmission gear 39a of the traveling clutch 39 is engaged with the transmission gear 43a connected to the traveling relay shaft 43. The power of the traveling clutch 39 is transmitted toward the left-right center of the transmission case 6 by the transmission gear 39a of the traveling clutch 39 and the transmission gear 43a of the traveling relay shaft 43, and then transmitted to the traveling relay shaft 43. In this case, the transmission gear 39a of the traveling clutch 39 and the transmission gear 43a of the traveling relay shaft 43 form a first transmission mechanism.

[0074] A speed change device 44 is provided across the traveling relay shaft 43 and the traveling transmission shaft 41. In the speed change device 44, a high-speed gear 47 rotatably attached to the traveling relay shaft 43 meshes with a transmission gear 41 a connected to the traveling transmission shaft 41, and a low-speed gear 48 rotatably attached to the traveling relay shaft 43 meshes with a transmission gear 41 b connected to the traveling transmission shaft 41. A shift member 49 is attached to the traveling relay shaft 43 by a spline structure so as to be rotatable and slidable integrally therewith.

[0075] In the transmission 44, when the shift member 49 is engaged with the high-speed gear 47, the power of the traveling relay shaft 43 is transmitted at high speed to the traveling transmission shaft 41 via the high-speed gear 47 and the transmission gear 41 a of the traveling transmission shaft 41. When the shift member 49 is engaged with the low-speed gear 48, the power of the traveling relay shaft 43 is transmitted at low speed to the traveling transmission shaft 41 via the low-speed gear 48 and the transmission gear 41 b of the traveling transmission shaft 41.

[0076] As a result, the power of the output shaft 11b of the electric motor 11 is transmitted to the rear wheels 2 via the input shaft 25, the traveling clutch 39, the traveling relay shaft 43, the speed change device 44, the traveling transmission shaft 41, and the rear wheel differential device 45. Based on the operation of the speed change pedal 35 (see FIG. 1), the electric motor 11 operates in forward and reverse rotation at a stepless speed, and the electric tractor moves forward (forward rotation of the electric motor 11) and backward (reverse rotation of the electric motor 11).

[0077] (Brake-Related Configuration) As shown in Fig. 8, a right brake 50 capable of braking the right rear wheel 2 and left and right brakes 50 capable of braking the left rear wheel 2 are provided in the third portion 6c of the transmission case 6. The right brake 50 and the right brake pedal 36 (see Fig. 1) are connected via a right linkage mechanism (not shown). The left brake 50 and the left brake pedal 36 (see Fig. 1) are connected via a left linkage mechanism (not shown).

[0078] When the operator of the driving section 8 steers the front wheels 1 to the right (left) using the steering handle 33, he or she depresses the right (left) brake pedal 36 to brake the right (left) rear wheels 2, thereby making a sharp turn to the right (left).

[0079] When the electric tractor is stopped from a traveling state, for example, if the operator of the driving unit 8 depresses the right and left brake pedals 36 to brake the right and left rear wheels 2, the depression of the right and left brake pedals 36 is detected and the traveling clutch 39 is disengaged. During maintenance work, for example, the operator can start and stop the electric motor 11 while keeping the traveling clutch 39 disengaged.

[0080] 2, 8, and 10, a pipe member 30 is connected in the front-to-rear direction between the rear portion 15 of the housing frame 5 and the front axle case 7. A front wheel transmission shaft 31 extends forward from the inside of the third portion 6c of the transmission case 6, passes through the inside of the pipe member 30, and is connected to a front wheel differential device (not shown) of the front axle case 7.

[0081] 5 and 7, the storage frame 5 has a recess 14a that is open downward and faces upward, in the left-right center of the lower part of the front part 14. As shown in Figures 5, 6, 8 and 10, in the storage frame 5, the pipe member 30 and the front wheel transmission shaft 31 are provided in the recess 14a in the front part 14 of the storage frame 5, and the front wheel transmission shaft 31 is provided in the opening 15b in the rear part 15 of the storage frame 5. The pipe member 30 and the front wheel transmission shaft 31 are provided at the position of the imaginary line L4 in a plan view.

[0082] A bearing portion 32 having a bearing is provided in the opening 15b of the rear portion 15 of the storage frame 5. The front wheel transmission shaft 31 passes through the bearing portion 32 and is supported by the bearing portion 32, and is supported by the rear portion 15 of the storage frame 5 via the bearing portion 32. The rear end of the pipe member 30 is attached to the bearing portion 32. In this case, the bearing portion 32 serves as the front wheel transmission bearing portion.

[0083] A seal member 51 is provided in the bearing portion 32. As a result, even if lubricating oil in the transmission case 6 attempts to enter the inside of the pipe member 30 through the opening 15b of the rear portion 15 of the housing frame 5 and the bearing portion 32, it is blocked by the seal member 51. Even if the lubricating oil in the transmission case 6 does enter the inside of the pipe member 30, the lubricating oil in the transmission case 6 cannot escape from the inside of the pipe member 30 to the outside. In this case, the seal member 51 serves as a front wheel transmission seal member.

[0084] The pipe member 30 and the front wheel transmission shaft 31 are arranged between the output shaft 11b of the electric motor 11 and the output shaft 12b of the electric motor 12 in a plan view, and are arranged in the left-right center of the storage frame 5, and are arranged directly below the frame 17 of the storage frame 5 (see Figures 3 to 7).

[0085] 5 and 6, the pipe member 30 and the front wheel transmission shaft 31 are provided at a height that overlaps with the electric motors 11, 12 in a side view. Specifically, the pipe member 30 and the front wheel transmission shaft 31 are provided between the output shafts 11b, 12b of the electric motors 11, 12 and the lower ends of the electric motors 11, 12 in a side view, and are provided above the frame 21 of the storage frame 5.

[0086] (Configuration of the transmission system to the front wheels in the transmission case)-2 As shown in Figures 8, 9, 11, and 12, the traveling relay gear 52 is rotatably attached to the PTO transmission shaft 42, and the transmission gear 41c connected to the traveling transmission shaft 41 is engaged with the traveling relay gear 52.

[0087] The front wheel transmission shaft 31 is attached to the switching gear 53 so that the switching gear 53 can rotate and slide integrally with the front wheel transmission shaft 31. The switching gear 53 can be slid between an engagement position where it engages with the traveling relay gear 52 and a spaced position where it is separated from the traveling relay gear 52.

[0088] When the switching gear 53 is operated to an engagement position where it engages with the traveling relay gear 52, the power of the traveling transmission shaft 41 is transmitted to the front wheel transmission shaft 31 via the transmission gear 41c of the traveling transmission shaft 41, the traveling relay gear 52, and the switching gear 53, and then transmitted from the front wheel transmission shaft 31 to the front wheels 1. This state is a four-wheel drive state in which the front wheels 1 and rear wheels 2 are driven.

[0089] When the switching gear 53 is operated to a separate position away from the traveling relay gear 52, the power of the traveling transmission shaft 41 is not transmitted to the front wheel transmission shaft 31, and the front wheels 1 are not driven. This state is a rear two-wheel drive state in which the rear wheels 2 are driven.

[0090] In this case, the input shaft 25, running clutch 39, running relay shaft 43, transmission 44, running transmission shaft 41 and rear wheel differential device 45, running relay gear 52, switching gear 53, front wheel transmission shaft 31, etc. constitute the transmission mechanism of the running system to the front wheels 1 and rear wheels 2.

[0091] (Configuration of the transmission system to the PTO shaft and mid-PTO shaft in the transmission case) - 1 As shown in Figures 8, 9 and 12, transmission gears 54, 55 and 56 are provided at a height between the traveling transmission shaft 41 and the input shaft 26, are provided between imaginary lines L1 and L2 in a plan view (rear view), and are provided between imaginary line L2 and the PTO transmission shaft 42 (traveling transmission shaft 41) in a plan view (rear view).

[0092] The transmission gear 40a of the PTO clutch 40 is engaged with the transmission gear 54. The transmission gears 55 and 56 are connected to each other so as to be rotatable as a single unit, and the transmission gears 55 and 54 are engaged with each other, and the transmission gear 56 is engaged with the transmission gear 42a connected to the PTO transmission shaft 42.

[0093] The PTO relay gear 57 and the PTO relay gear 58 are connected to each other so as to be rotatable as a unit, and the PTO relay gears 57, 58 are rotatably attached to the front wheel transmission shaft 31. The transmission gear 42b connected to the PTO transmission shaft 42 and the PTO relay gear 57 are in mesh with each other.

[0094] A transmission gear 59 is rotatably attached to the mid-PTO shaft 29, and the PTO relay gear 58 meshes with the transmission gear 59. A shift member 60 is attached to the mid-PTO shaft 29 by a spline structure so as to be rotatable and slidable integrally therewith.

[0095] 8, 9, and 12, the power of the PTO clutch 40 is transmitted toward the left-right center of the transmission case 6 by the transmission gear 40a of the PTO clutch 40 and transmission gears 54, 55, and 56, then to the PTO transmission shaft 42, and from the PTO transmission shaft 42 to the PTO shaft 28. In this case, the transmission gear 40a of the PTO clutch 40, the transmission gear 42a of the PTO transmission shaft 42, and the transmission gears 54, 55, and 56 form a second transmission mechanism.

[0096] When the shift member 60 is engaged with the transmission gear 59 , the power of the PTO transmission shaft 42 is transmitted to the mid-PTO shaft 29 via the transmission gear 42 b of the PTO transmission shaft 42 , the PTO relay gears 57 and 58 , the transmission gear 59 , and the shift member 60 .

[0097] As a result, the PTO clutch 40 is operated to the transmission state and the disengagement state, thereby operating and stopping the PTO shaft 28 and the mid-PTO shaft 29. When the shift member 60 is operated to move away from the transmission gear 59 while the PTO clutch 40 is operated to the transmission state, the mid-PTO shaft 29 stops while the PTO shaft 28 remains in the operating state.

[0098] In the electric tractor, when a work implement such as a rotary tiller (not shown) is attached to the rear of the machine body 3, the power of the PTO shaft 28 is transmitted to the work implement. When a work implement such as a mower (not shown) is attached to the lower part of the machine body 3 between the front wheels 1 and the rear wheels 2, the power of the mid-PTO shaft 29 is transmitted to the work implement.

[0099] In this case, the PTO clutch 40 , PTO transmission shaft 42 , PTO relay gears 57 , 58 , transmission gear 59 , shift member 60 , etc. constitute a PTO system transmission mechanism to the PTO shaft 28 and mid-PTO shaft 29 .

[0100] 1, 2, and 8, the right portion of the first portion 6a of the transmission case 6 is positioned laterally outward to the right of the right portion of the second portion 6b of the transmission case 6. As a result, the width W1 of the first portion 6a of the transmission case 6 in the left-right direction is greater than the width W2 of the second portion 6b of the transmission case 6 in the left-right direction.

[0101] The hydraulic pump 61 is attached facing rearward to the right portion of the first portion 6a of the transmission case 6. As a result, the hydraulic pump 61 is provided on the right side of the imaginary line L4, which is the same side as the electric motor 12, in a plan view. The hydraulic pump 61 is provided laterally outward from the right portion of the second portion 6b of the transmission case 6 (the same side as the electric motor 12), and is provided rearward of the right portion of the rear portion 15 of the accommodation frame 5 (the same side as the electric motor 12).

[0102] 8 and 9, a transmission gear 62 and a transmission gear 63 are provided in the right portion inside the first portion 6a of the transmission case 6. The transmission gear 26a connected to the input shaft 26 meshes with the transmission gear 62, the transmission gear 62 meshes with the transmission gear 63, and the transmission gear 63 meshes with the input gear 61a of the hydraulic pump 61.

[0103] The power of the electric motor 12 is transmitted to the hydraulic pump 61 via the transmission gear 26a of the input shaft 26 and transmission gears 62 and 63, thereby driving the hydraulic pump 61. Because the PTO clutch 40 is provided downstream of the input shaft 26, the hydraulic pump 61 is driven by the electric motor 12 even when the PTO clutch 40 is disengaged.

[0104] (Configuration of the Filter) As shown in FIGS. 2 and 8, a lubricating oil outlet (not shown) is opened in the left portion of the second portion 6b of the transmission case 6, and the filter 64 is connected to the outlet.

[0105] The filter 64 is provided laterally outward from the left portion (opposite the electric motor 12) of the second part 6b of the transmission case 6, and is provided rearward from the left portion (opposite the electric motor 12) of the rear part 15 of the accommodating frame 5.

[0106] As shown in Figures 1, 2 and 8, the oil supply passage 74 is connected between the hydraulic pump 61 and the filter 64, and the oil supply passage 74 is provided above the second portion 6b of the transmission case 6 along the left-right direction.

[0107] Lubricating oil in the transmission case 6 passes through a filter 64 and then through a supply oil passage 74, and is supplied as hydraulic oil to the hydraulic pump 61. The hydraulic oil from the hydraulic pump 61 is supplied to hydraulic equipment such as a power steering device (not shown) equipped on the electric tractor, and the hydraulic equipment such as the power steering device operates using the supplied hydraulic oil.

[0108] 1 and 2, an electric tractor may be equipped with a front loader device 65, which is a work device. The front loader device 65 has right and left bases 66, right and left booms 67, a bucket 68, right and left boom cylinders 69, and right and left bucket cylinders 70.

[0109] When the front loader device 65 is installed, the lower part of the right base 66 of the front loader device 65 is connected to the outer lateral surface of the right mounting portion 23 of the storage frame 5, and the lower part of the left base 66 is connected to the outer lateral surface of the left mounting portion 23 of the storage frame 5.

[0110] When the base 66 of the front loader device 65 is connected to the mounting portion 23 of the storage frame 5, the front end portion of the right (left) front and rear frame 73 is connected to the lateral outer surface portion of the right (left) base 66 of the front loader device 65, and the rear end portion of the right (left) front and rear frame 73 is connected to the right (left) rear axle case 6d of the transmission case 6.

[0111] As a result, the base 66 of the front loader device 65 is sandwiched between the mounting portion 23 and the front end of the front and rear frames 73, and the mounting portion 23, the front end of the front and rear frames 73 and the base 66 of the front loader device 65 are fastened together.

[0112] The right front-rear frame 73 is provided laterally outward to the right of the right inverter 24 and the transmission case 6, and is provided laterally outward to the right of the hydraulic pump 61. The left front-rear frame 73 is provided laterally outward to the left of the left inverter 24 and the transmission case 6, and is provided laterally outward to the left of the filter 64.

[0113] 1 and 2, a control valve unit 71 provided with a plurality of electromagnetically operated control valves is attached to the front of the right front / rear frame 73, and a cover 75 covering the control valve unit 71 is attached to the right front / rear frame 73. An oil passage 76 is connected between the hydraulic pump 61 and the control valve unit 71, and hydraulic oil from the hydraulic pump 61 is supplied to the control valve unit 71. In this case, the control valve unit 71 serves as a control valve.

[0114] Right and left fenders 77 are provided on the right and left parts of the driver's section 8, above the right and left rear wheels 2. An operating lever 72 is provided at the front of the upper part of the right fender 77.

[0115] As a result, the operating lever 72 is provided on the right side of the left-right center of the driving unit 8 in a plan view, and is provided on the right side (the same side as the electric motor 12) of the left-right center of the driving unit 8 in a plan view. The left-right center of the driving unit 8 and the virtual line L4 are in approximately the same position in a plan view.

[0116] A position sensor (not shown) that detects the operating position of the operating lever 72 is provided on the right fender 77, and the control valve of the control valve unit 71 is operated based on the operation of the operating lever 72. In this case, the operating lever 72 is a manual operating tool.

[0117] The operator in the driver's seat 34 operates the operating lever 72 with his right hand to operate the control valve of the control valve unit 71. As a result, hydraulic oil from the hydraulic pump 61 is supplied to and discharged from the boom cylinder 69 and bucket cylinder 70 of the front loader device 65 via the control valve unit 71, and the boom 67 and bucket 68 of the front loader device 65 are operated.

[0118] (First Alternative Embodiment of the Invention) The storage frame 5 may be eliminated, and only the flat plate-shaped rear portion 15 (connecting portion) may be provided.

[0119] According to this configuration, the rear section 15 (connecting section) may be connected to the lower part of the floor 38. The front frame 4 may extend rearward beneath the floor 38 and be connected to the transmission case 6, with the rear section 15 (connecting section) being connected to the front frame 4. According to this configuration, the electric motors 11, 12 are connected to the front section of the rear section 15 (connecting section), and the transmission case 6 is connected to the rear section of the rear section 15 (connecting section). A base 66 of the front loader device 65 may be connected to the front frame 4.

[0120] (Second Modification of the Invention) When the electric motors 11 and 12 are provided side by side in the left-right direction, the electric motor 11 may be provided on the right and the electric motor 12 may be provided on the left.

[0121] According to this configuration, the traveling clutch 39 (imaginary line L1), traveling relay shaft 43, and transmission 44 are provided to the right of the traveling transmission shaft 41 and the PTO transmission shaft 42 in a plan view. The filter 64 is provided to the right of the second portion 6b of the transmission case 6.

[0122] The PTO clutch 40 (imaginary line L2) and transmission gears 54, 55, 56, etc. are provided on the left side of the travel transmission shaft 41 and the PTO transmission shaft 42 in a plan view. The hydraulic pump 61, transmission gears 62, 63, control valve unit 71, etc. are provided on the left side of the second portion 6b of the transmission case 6. An operating lever 72 is provided in the driver's section 8 at the front above the left fender 77.

[0123] (Third alternative embodiment of the invention) Since the electric motor 12 may require a larger output than the electric motor 11 that generates the power for traveling, the electric motor 12 may be configured to have a larger output than the electric motor 11.

[0124] Fourth Modification of the Invention The battery 10 , the electric motors 11 and 12 , and the housing frame 5 may be arranged so that the rear end of the battery 10 is located slightly rearward of the front ends of the electric motors 11 and 12 .

[0125] (Fifth Alternative Embodiment of the Invention) In the driving section 8, the operating lever 72 does not have to be provided on the fender 77. According to this configuration, the operating lever 72 may be configured to be provided to the right or left of the steering handle 33.

[0126] Sixth Modification of the Invention In the control valve unit 71, the control valve may be configured as a mechanically operated type instead of an electromagnetically operated type.

[0127] According to this configuration, a mechanical linkage mechanism (not shown) such as a link mechanism is connected between the operating lever 72 and the control valve unit 71, and the operation of the operating lever 72 is transmitted to the control valve unit 711 via the linkage mechanism, thereby operating the control valve of the control valve unit 71.

[0128] Seventh Alternative Embodiment of the Invention The front portions of the electric motors 11, 12 may be connected to the front portion 14 of the storage frame 5. With this configuration, the casings of the electric motors 11, 12 become part of the storage frame 5, thereby improving the rigidity of the storage frame 5.

[0129] Eighth Modification of the Invention When the front loader device 65 is not installed, the front and rear frames 73 may be connected across the mounting portion 23 of the storage frame 5 and the rear axle case 6 d of the transmission case 6 .

[0130] Ninth Alternative Embodiment of the Invention Instead of the rear wheels 2, crawler-type right and left traveling devices (not shown) may be attached to the transmission case 6.

[0131] The electric tractor may not only be equipped with the electric motors 11 and 12 as a power source, but may also be configured as a hybrid type electric tractor equipped with an engine (not shown) and the electric motors 11 and 12 as a power source.

[0132] (Correspondence to Claims) -1 With the above configuration, the vehicle is equipped with a first electric motor 11 that generates power for traveling and a second electric motor 12 that generates power to operate the attached working device (front loader device 65). The first electric motor 11 and the second electric motor 12 are arranged side by side in the left-right direction. A hydraulic pump 61 is provided that supplies hydraulic oil to the working device (front loader device 65). The hydraulic pump 61 is arranged on the same side as the second electric motor 12 in a plan view with respect to an imaginary line L4 that passes between the first electric motor 11 and the second electric motor 12 in the front-to-rear direction, and is driven by the second electric motor 12.

[0133] A control valve (control valve unit 71) is provided to which hydraulic oil is supplied from the hydraulic pump 61 and which supplies and discharges hydraulic oil to an attached work device (front loader device 65). The control valve (control valve unit 71) is provided on the same side as the second electric motor 12 with respect to the imaginary line L4 in a plan view.

[0134] The machine is provided with a driving section 8 on which an operator sits. The machine is also provided with an operating device (operating lever 72) that can be operated by the operator of the driving section 8 and that operates a control valve (control valve unit 71). The operating device (operating lever 72) is provided on the same side as the second electric motor 12 with respect to the left-right center of the driving section 8 in a plan view.

[0135] The manual operating tool (operating lever 72) is provided on the right side of the center of the driving unit 8 in plan view. The second electric motor 12 and the hydraulic pump 61 are provided on the right side of the imaginary line L4 in plan view.

[0136] (Correspondence to Claims) -2 With the above configuration, the transmission case 6 is provided with a transmission mechanism therein to transmit the power of the first electric motor 11 and the second electric motor 12. The transmission case 6 is provided behind the first electric motor 11 and the second electric motor 12. A hydraulic pump 61 is provided laterally outward on the right or left side of the transmission case 6 on the same side as the second electric motor 12.

[0137] The vehicle is provided with a storage frame 5 that houses the first electric motor 11 and the second electric motor 12 and has a left-right width W4 that is larger than the left-right widths W1, W2, and W3 of the transmission case 6. The transmission case 6 is connected to a rear portion 15 of the storage frame 5. A hydraulic pump 61 is provided behind the right or left portion of the rear portion 15 of the storage frame 5 on the same side as the second electric motor 12.

[0138] (Correspondence to Claims) -3 With the above configuration, hydraulic oil is supplied from the hydraulic pump 61, and a control valve (control valve unit 71) is provided that supplies and discharges hydraulic oil to the installed working device (front loader device 65). The control valve (control valve unit 71) is provided laterally outward on the right part (right lateral part 16) or left part (left lateral part 16) on the same side as the second electric motor 12 in the storage frame 5.

[0139] A filter 64 is provided laterally outward on the right side (right lateral portion 16) or left side (left lateral portion 16) of the transmission case 6, opposite the second electric motor 12, and is supplied with lubricating oil stored in the transmission case 6. The lubricating oil stored in the transmission case 6 is supplied to the hydraulic pump 61 through the filter 64 as working oil.

[0140] A filter 64 is provided laterally outward of the right or left portion of the transmission case 6 opposite the second electric motor 12 and behind the right or left portion of the rear part 15 of the accommodation frame 5 opposite the second electric motor 12, and is supplied with lubricating oil stored in the transmission case 6. The lubricating oil stored in the transmission case 6 is supplied to the hydraulic pump 61 through the filter 64 as working oil.

[0141] An oil supply passage 74 is provided that connects the filter 64 and the hydraulic pump 61 and supplies the lubricating oil stored in the transmission case 6 as hydraulic oil to the hydraulic pump 61. The oil supply passage 74 is provided above the transmission case 6 along the left-right direction.

[0142] The present invention can be applied to an electric tractor.

[0143] DESCRIPTION OF SYMBOLS 5 Storage frame 6 Transmission case 8 Driving section 11 Electric motor (first electric motor) 12 Electric motor (second electric motor) 15 Rear section of storage frame 16 Side section (right section) (left section) of storage frame 61 Hydraulic pump 64 Filter 65 Front loader device (working device) 71 Control valve unit (control valve) 72 Operation lever (manually operated tool) 74 Oil supply passage L4 Virtual line W1 Width in the left-right direction of first section of transmission case (width in the left-right direction of transmission case) W2 Width in the left-right direction of second section of transmission case (width in the left-right direction of transmission case) W3 Width in the left-right direction of third section of transmission case (width in the left-right direction of transmission case) W4 Width in the left-right direction of storage frame

Claims

1. A first electric motor that generates power for driving, It is equipped with a second electric motor that generates power to operate the mounted work device, The first electric motor and the second electric motor are arranged side by side along the left-right direction. The aforementioned work device is equipped with a hydraulic pump that supplies hydraulic fluid. An electric tractor in which the hydraulic pump is provided on the same side as the second electric motor in a plan view with respect to an imaginary line passing along the front-rear direction between the first electric motor and the second electric motor, and is driven by the second electric motor.

2. The hydraulic pump is supplied with hydraulic fluid, and a control valve is provided to supply and discharge the hydraulic fluid to the equipped work device. The electric tractor according to claim 1, wherein the control valve is provided on the same side as the second electric motor in a plan view with respect to the dashed line.

3. The driver's compartment where the worker sits, The aforementioned operating unit is equipped with a manual operating device that can be operated by an operator and which operates the control valve, The electric tractor according to claim 2, wherein the manual operating device is provided on the same side as the second electric motor in a plan view with respect to the left and right central portion of the operating unit.

4. The aforementioned manual operating device is provided on the right side in a plan view with respect to the left-right center of the operating unit, The electric tractor according to claim 3, wherein the second electric motor and the hydraulic pump are located to the right in a plan view with respect to the dashed line.

5. A transmission case is provided, which contains a transmission mechanism inside which power is transmitted between the first electric motor and the second electric motor. The transmission case is provided behind the first electric motor and the second electric motor, The electric tractor according to claim 1, wherein the hydraulic pump is provided laterally outward on the right or left side of the transmission case, on the same side as the second electric motor.

6. A housing frame is provided that houses the first electric motor and the second electric motor, and has a width in the left-right direction that is greater than the width in the left-right direction of the transmission case. The transmission case is connected to the rear of the housing frame, The electric tractor according to claim 5, wherein the hydraulic pump is located at the rear of the right or left portion of the housing frame, on the same side as the second electric motor.

7. The hydraulic pump is supplied with hydraulic fluid, and a control valve is provided to supply and discharge the hydraulic fluid to the equipped work device. The electric tractor according to claim 6, wherein the control valve is provided laterally outward on the right or left side of the housing frame on the same side as the second electric motor.

8. A filter is provided on the right or left side of the transmission case opposite to the second electric motor, to which lubricating oil stored in the transmission case is supplied. The electric tractor according to claim 5, wherein the lubricating oil stored in the transmission case is supplied to the hydraulic pump as hydraulic fluid through the filter.

9. A filter is provided, which is located laterally outward on the right or left side opposite the second electric motor in the transmission case, and is located behind the right or left side opposite the second electric motor in the rear of the housing frame, and to which the lubricating oil stored in the transmission case is supplied. The electric tractor according to claim 6, wherein the lubricating oil stored in the transmission case is supplied to the hydraulic pump as hydraulic fluid through the filter.

10. A supply oil passage is provided that is connected between the filter and the hydraulic pump and supplies the lubricating oil stored in the transmission case to the hydraulic pump as hydraulic fluid. The electric tractor according to claim 8 or 9, wherein the oil supply passage is provided above the transmission case along the left-right direction.