electric work vehicle

Abstract

To achieve simplification of a motor support structure in an electric work vehicle.SOLUTION: An electric work vehicle comprises: a main frame 10 that supports a traveling device; and a battery 13. A support frame 34 is provided that is attached to the main frame 10 and has the battery 13 mounted thereon, whereby the battery 13 is supported on the main frame 10. A motor 15 is provided that runs on electric power from the battery 13 and drives the traveling device, and the motor 15 is supported suspended from the support frame 34.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to an electric work vehicle configured so that a traveling device is driven by a motor. [Background technology]

[0002] In some electric work vehicles, as disclosed in Patent Document 1, for example, the battery is supported on the main frame, and the motor that drives the traveling device is mounted below the battery and supported on the main frame. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2020-104568 Summary of the Invention [Problem to be solved by the invention]

[0004] In the electric work vehicle of Patent Document 1, various frames are connected between the motor and the main frame in order to support the motor on the main frame, so there is room for improvement in terms of simplifying the structure. An object of the present invention is to simplify the motor support structure in an electric work vehicle. [Means for solving the problem]

[0005] The electric work vehicle of the present invention comprises a traveling device, a main frame that supports the traveling device, a battery, a support frame that is attached to the main frame and on which the battery is placed, thereby supporting the battery on the main frame, and a motor that operates with power from the battery and drives the traveling device, the motor being suspended and supported by the support frame. The support frame is provided with a connecting portion that protrudes downward and to which the motor is connected, and an opening that exposes the connecting portion upward is provided in a portion of the support frame above the connecting portion. There are. The electric work vehicle of the present invention comprises a traveling device, a main frame that supports the traveling device, a battery, a support frame that is attached to the main frame and on which the battery is placed, thereby supporting the battery on the main frame, and a motor that operates using power from the battery and drives the traveling device, the motor being suspended from the support frame, the upper part of the motor being connected to the support frame, and the front or rear of the motor being connected to the main frame. The electric work vehicle of the present invention comprises a traveling device, a main frame that supports the traveling device, a battery, a support frame that is attached to the main frame and on which the battery is placed, thereby supporting the battery on the main frame, and a motor that operates with power from the battery and drives the traveling device, the motor being supported by being suspended from the support frame, and the support frame having a base portion on which the battery is placed and a rising portion that rises from the base portion and surrounds the outer periphery of the lower part of the battery, an inverter that supplies power from the battery to the motor is provided below the support frame, adjacent to the motor, and the portion of the support frame adjacent to the inverter is configured in a shape that allows the inverter to move horizontally. The electric work vehicle of the present invention comprises a traveling device, a main frame supporting the traveling device, a battery, a support frame attached to the main frame and on which the battery is placed, thereby supporting the battery on the main frame, and a motor that operates with power from the battery and drives the traveling device, the motor being suspended and supported by the support frame, and a driving section being provided on the rear side of the support frame, The right front and left front portions of the floor section of the driver's section extend forward to positions adjacent to the right rear and left rear portions of the support frame, and left and right floor frames are provided that can support the right front and left front portions of the floor section, and the left and right floor frames are detachable from the right rear and left rear portions of the support frame.

[0006] According to the present invention, the battery is supported on the main frame by the support frame, and the motor is suspended from the support frame. The motor is supported on the main frame via the support frame, and the support frame has the functions of supporting the battery on the main frame and supporting the motor on the main frame.

[0007] According to the present invention, by providing the support frame with the function of supporting the battery on the main frame and the function of supporting the motor on the main frame, it is possible to use the same components for both purposes, thereby simplifying the motor support structure.

[0008] In the present invention, it is preferable that the support frame is provided with a connecting portion that protrudes downward and to which the motor is connected, and that an opening is provided in the portion of the support frame above the connecting portion to expose the connecting portion upward.

[0009] According to the present invention, since the connecting portion protrudes downward from the support frame, even if a connecting member that connects the motor to the connecting portion is provided on the connecting portion, the connecting member does not protrude upward from the support frame, and therefore the connecting member does not interfere with the battery when the battery is placed on the support frame. According to the present invention, the opening that exposes the connecting portion upward is provided in the support frame, so that the worker can easily visually check the state of the connecting portion from above through the opening.

[0010] In the present invention, it is preferable that the support frame is provided with a plurality of front and rear frames extending along the front-to-rear direction and spaced apart from each other in the left-to-right direction, and a plurality of left and right frames extending along the left-to-right direction and spaced apart from each other in the front-to-rear direction, and that the opening is provided in either the plurality of front and rear frames or the plurality of left and right frames.

[0011] According to the present invention, the support frame is configured in a lattice shape with front and rear frames and left and right frames, and when the battery is removed from the support frame, the worker can see downward through the gaps between the front and rear frames and the left and right frames.

[0012] This allows the worker to visually check the condition of the connecting parts from above through the opening, and also allows the worker to visually check the condition of the connecting parts between the front and rear frames and between the left and right frames. The support frame is configured in a lattice shape, which makes it possible to reduce the weight of the support frame.

[0013] In the present invention, it is preferable that an upper portion of the motor is connected to the support frame, and a front portion or a rear portion of the motor is connected to the main frame.

[0014] According to the present invention, in addition to connecting the upper part of the motor to the support frame, the front or rear part of the motor is connected to the main frame, thereby improving the supporting strength of the motor.

[0015] In the present invention, it is preferable that the support frame has a base portion on which the battery is placed and a rising portion that rises from the base portion and surrounds the lower outer periphery of the battery, that an inverter that supplies power from the battery to the motor is provided next to the motor on the lower side of the support frame, and that the portion of the support frame adjacent to the inverter is configured in a shape that allows the inverter to move horizontally.

[0016] According to the present invention, when the battery is placed on the base portion of the support frame, the lower outer periphery of the battery is surrounded by the raised portion of the support frame, thereby improving the stability of support for the battery when it is placed on the support frame.

[0017] According to the present invention, the inverter that supplies power from the battery to the motor is provided below the support frame so as to be adjacent to the motor. In this case, for maintenance work on the inverter, a worker may move the inverter along the horizontal direction to remove it from the position below the support frame or return it to the position below the support frame.

[0018] According to the present invention, the portion of the support frame adjacent to the inverter is configured in a shape that allows the inverter to move horizontally, so that when a worker moves the inverter horizontally as described above, the inverter is less likely to come into contact with the portion of the support frame adjacent to the inverter, improving the workability of maintenance work.

[0019] In the present invention, it is preferable that a portion of the support frame adjacent to the inverter is configured to have an upwardly recessed shape.

[0020] According to the present invention, the portion of the support frame adjacent to the inverter is configured in a simple shape that is concave upward, which makes it easy to obtain a configuration in which the inverter is less likely to come into contact with the portion of the support frame adjacent to the inverter, thereby simplifying the structure of the support frame.

[0021] In the present invention, it is preferable that the portion of the support frame adjacent to the inverter is a portion of the support frame located on the opposite side of the inverter from the motor.

[0022] As described above, when removing the inverter, the worker moves the inverter from a position below the support frame to a position opposite the motor. When installing the inverter, the worker moves the inverter from a position opposite the motor to a position below the support frame. This makes it less likely that the motor will interfere with the movement of the inverter, improving the efficiency of maintenance work.

[0023] In the present invention, it is preferable that the driving section is provided rearward relative to the support frame, the right front and left front portions of the floor section of the driving section extend forward to positions adjacent to the right rear and left rear portions of the support frame, left and right floor frames are provided that can support the right front and left front portions of the floor section, and the left and right floor frames are attachable and detachable to the right rear and left rear portions of the support frame.

[0024] In an electric work vehicle, the driver's section is located at the rear of the support frame, and the right and left front portions of the floor section of the driver's section may extend forward to positions adjacent to the right and left rear portions of the support frame.

[0025] According to the present invention, the right and left front portions of the floor portion are supported by the left and right floor frames attached to the right and left rear portions of the support frame, thereby improving the stability of support for the floor portion.

[0026] According to the present invention, since the floor frame is detachable from the support frame, when removing or installing the floor section for maintenance work, the floor frame can be removed in advance, or the floor frame can be removed and installed together with the floor section removal and installation work.

[0027] This allows the floor frame to be removed and attached according to the type of work required to remove and attach the floor section and the type of maintenance work, making it easier to remove and attach the floor section and perform maintenance work, improving workability. [Brief explanation of the drawings]

[0028] [Figure 1] FIG. 2 is a left side view of the tractor. [Figure 2] FIG. [Figure 3] FIG. 2 is a schematic diagram showing a transmission system from a motor to the front and rear wheels. [Figure 4] FIG. [Figure 5] FIG. 2 is a left side view of the vicinity of the inverter and the motor. [Figure 6] FIG. 2 is a vertical sectional front view of the vicinity of the support frame and the inverter. [Figure 7] FIG. [Figure 8] FIG. 2 is an exploded perspective view of a support frame and a motor. [Figure 9] FIG. [Figure 10] FIG. [Figure 11] FIG. [Figure 12] FIG. 2 is a plan view of the vicinity of the terminals, connectors, and restricting members of the motor. [Figure 13] FIG. 2 is a longitudinal left side view of the vicinity of the terminals, connector, and restricting member of the motor. [Figure 14] FIG. 13 is a longitudinal sectional left side view of the vicinity of the terminals, connector, and restricting member of the motor in a sixth modified embodiment of the invention. DETAILED DESCRIPTION OF THE INVENTION

[0029] Figures 1 to 14 show a tractor, which is an example of an electric work vehicle, and in Figures 1 to 14, F indicates the forward direction, B indicates the backward direction, U indicates the upward direction, D indicates the downward direction, R indicates the right direction, and L indicates the left direction.

[0030] (Overall configuration of the tractor) As shown in Figures 1 and 2, a vehicle body 3 is supported by right and left front wheels 1 (corresponding to the running gear) and right and left rear wheels 2 (corresponding to the running gear). A hood 4 is provided at the front of the vehicle body 3, and a driver's section 5 is provided at the rear of the vehicle body 3. The driver's section 5 is provided with a steering wheel 6 for steering the front wheels 1, a driver's seat 7, a floor section 8, and a rope frame 9.

[0031] The machine body 3 is configured to include right and left main frames 10, a continuously variable transmission case 11, and a transmission case 12. The continuously variable transmission case 11 is connected to the front of the transmission case 12, and the right and left main frames 10 are connected to the continuously variable transmission case 11 and the transmission case 12 and are provided along the front-to-rear direction. A front wheel 1 is supported by the main frames 10, and a rear wheel 2 is supported by the transmission case 12. With the above configuration, the vehicle is provided with the front wheels 1 (traveling devices), the rear wheels 2 (traveling devices), and the main frame 10 that supports the front wheels 1 (traveling devices).

[0032] (Front configuration of the aircraft) As shown in FIG. 1, a battery 13, an inverter 14, and a motor 15 are supported on a main frame 10.

[0033] 4, a connection part 16 is provided on the left side of the front of the battery 13, and a charger (not shown) for an external power supply (not shown) is connected to the connection part 16, so that power from the external power supply is charged into the battery 13 from the connection part 16. Power from the battery 13 is supplied to the inverter 14, and in the inverter 14, the DC power of the battery 13 is converted into AC power and supplied to the motor 15, which drives the motor 15.

[0034] 2 and 4, a DC-DC converter 17, a battery 18, a radiator 19, a water pump 20, etc. are provided in the front part of the main frame 10. The hood 4 covers the battery 13, the inverter 14, the connection part 16, the DC-DC converter 17, the battery 18, the radiator 19, etc. With the above configuration, the battery 13 and the hood that houses the battery 13 are provided.

[0035] The power of battery 13 is supplied to DC-DC converter 17, where it is reduced to 12 V. The power reduced to 12 V is supplied to battery 13, and then supplied from battery 13 to battery 18. Various devices (not shown) equipped on the tractor are operated by the 12 V power from battery 18.

[0036] When the water pump 20 is operated, the cooling water generated in the radiator 19 is supplied to the water pump 20 via a pipe 21, and then supplied from the water pump 20 to the inverter 14. The cooling water that has passed through the inside of the inverter 14 is supplied to the motor 15 via a pipe 22, and the cooling water that has passed through the inside of the motor 15 is supplied to the DC-DC converter 17, and returns to the radiator 19 from the DC-DC converter 17 via a pipe 23.

[0037] (Configuration of transmission system to front and rear wheels) 1 and 3, a hydrostatic continuously variable transmission 24 is housed inside the continuously variable transmission case 11, and the power of the motor 15 is transmitted to the continuously variable transmission 24 via a transmission shaft 25. The continuously variable transmission 24 can change speeds continuously between the forward and reverse sides, and is operated by a speed change pedal 26 (see FIG. 2) provided on the floor portion 8.

[0038] An auxiliary transmission 27, a rear wheel differential 28, a front wheel transmission 29, and right and left brakes 30 are housed inside the transmission case 12. Power from the continuously variable transmission 24 is transmitted to the auxiliary transmission 27, and then from the auxiliary transmission 27 to the rear wheels 2 via the rear wheel differential 28.

[0039] The power branched off between the sub-transmission 27 and the rear wheel differential device 28 is transmitted to the front wheel transmission 29, from the front wheel transmission 29 to the front wheel differential device 32 via the transmission shaft 31, and from the front wheel differential device 32 to the front wheels 1.

[0040] When the front wheel 1 is steered to the right or left within a set angle range from the straight ahead position, the front wheel transmission 29 drives the front wheel 1 and the rear wheel 2 at the same speed. When the front wheel 1 is steered to the right or left beyond the set angle range, the front wheel transmission 29 drives the front wheel 1 at a higher speed than the rear wheel 2.

[0041] With the above configuration, a motor 15 is provided that operates using power from a battery 13 and drives the front wheel 1 (running device) and the rear wheel 2 (running device), and the front wheel 1 (running device) and the rear wheel 2 (running device) are driven by the motor 15.

[0042] A right brake 30 is provided in the transmission system from the rear wheel differential device 28 to the right rear wheel 2, and a left brake 30 is provided in the transmission system from the rear wheel differential device 28 to the left rear wheel 2. A right brake pedal 33 that can operate the right brake 30 and a left brake pedal 33 that can operate the left brake 30 are provided on the left front part 8b of the floor part 8 (see FIG. 2). When turning right (left), the right (left) brake pedal 33, which is on the turning center side, is depressed to apply the right (left) brake 30, thereby enabling tight turns.

[0043] (Configuration of the support frame that supports the battery) As shown in FIGS. 4 to 7, a support frame 34 is attached to the main frame 10, and the battery 13 is placed on and connected to the support frame 34.

[0044] As shown in Figures 8 to 11, the support frame 34 has front and rear frames 35, 36 (corresponding to base portions), left and right frames 37, 38, 39 (corresponding to base portions), right and left leg portions 40, right and left connecting plates 41, right and left brackets 42, raised portions 45, 46, etc.

[0045] The support frame 34 (front / rear frames 35, 36 and left / right frames 37, 38, 39) is configured in a grid pattern in plan view, with the front / rear frames 35, 36 spaced apart from each other in the left / right direction and the left / right frames 37, 38, 39 spaced apart from each other in the front / rear direction, and the front / rear frames 35, 36 and the left / right frames 37, 38, 39 are connected to each other.

[0046] Two channel-shaped legs 40 are connected to the front of the right front-rear frame 36, and a connecting plate 41 extending in the front-rear direction is connected to the lower parts of the two legs 40. Two channel-shaped legs 40 are connected to the front of the left front-rear frame 36, and a connecting plate 41 extending in the front-rear direction is connected to the lower parts of the two legs 40. A bracket 42 is connected to the rear of the right front-rear frame 36 and to the rear of the left front-rear frame 36.

[0047] Flat plate-shaped rising portions 45 are connected with bolts to the left and right frames 37 and rise upward from the left and right frames 37. Flat plate-shaped rising portions 46 are connected with bolts to the right and left front and rear frames 36 and rise upward from the front and rear frames 36.

[0048] (Support structure of the support frame in the main frame) 4 to 7, right and left flat support members 43 are connected to the upper front portions of the right and left main frames 10 in the front-to-rear direction. A gear case 44 is connected to the right and left main frames 10 in the left-to-right direction.

[0049] The right leg 40 and connecting plate 41 of the support frame 34 are bolted to the right support member 43, and the left leg 40 and connecting plate 41 of the support frame 34 are bolted to the left support member 43. The right bracket 42 of the support frame 34 is bolted to the right part of the gear case 44, and the left bracket 42 of the support frame 34 is bolted to the left part of the gear case 44.

[0050] As described above, the support frame 34 is attached to the main frame 10, and the front and rear frames 36 of the support frame 34 are located at a position slightly above the upper end of the main frame 10.

[0051] (Battery support state in the support frame) As shown in FIGS. 4 to 7, when the battery 13 is placed on the front and rear frames 35, 36 and the left and right frames 37, 38, 39 of the support frame 34, the lower outer periphery of the battery 13 is surrounded by the rising portions 45, 46 of the support frame 34.

[0052] The front part of the lower part of the battery 13 is bolted to the raised part 45, the right and left parts of the lower part of the battery 13 are bolted to the raised part 46, and the rear part of the lower part of the battery 13 is bolted to the left and right frames 39, thereby connecting the battery 13 to the support frame 34.

[0053] With the above-described configuration, a support frame 34 is provided that is attached to the main frame 10 and has the battery 13 placed thereon, thereby supporting the battery 13 on the main frame 10. The support frame 34 is provided with a plurality of front and rear frames 35, 36 extending along the front-rear direction and spaced apart from each other in the left-right direction, and a plurality of left and right frames 37, 38, 39 extending along the left-right direction and spaced apart from each other in the front-rear direction.

[0054] The support frame 34 is provided with front and rear frames 35, 36 (base portions) and left and right frames 37, 38, 39 (base portions) on which the battery is placed, and rising portions 45, 46 that rise from the front and rear frames 35, 36 (base portions) and left and right frames 37, 38, 39 (base portions) and surround the outer periphery of the lower part of the battery 13.

[0055] (Motor support structure) As shown in FIGS. 8, 9 and 10, a connecting portion 47 is provided at the rear of the front and rear frame 35 of the support frame 34 (between the left and right frame 38 and the left and right frame 39).

[0056] The connecting portion 47 is formed by bending a plate material into a channel shape, and is connected to the underside of the front and rear frames 35 of the support frame 34, and is provided on the support frame 34 so as to protrude downward from the front and rear frames 35 of the support frame 34.

[0057] The connecting bolts 48 are inserted into openings in the connecting portions 47, and openings 35a are formed in the front and rear frames 35 of the support frame 34 above the connecting portions 47. By inserting a tool such as a wrench into the openings 35a in the front and rear frames 35, an operator can tighten and loosen the connecting bolts 48 using the tool such as a wrench.

[0058] 4, 5, and 7 to 10, the motor 15 is provided below the rear of the front and rear frames 35 of the support frame 34 (between the left and right frames 38, 39), and is provided between the right and left main frames 10. The motor 15 and a connecting portion 47 are connected by connecting bolts 48, and the rear of the motor 15 is connected to the gear case 44 by bolts.

[0059] With the above configuration, the support frame 34 is provided with a connecting portion 47 that protrudes downward and to which the motor 15 is connected, and the motor 15 is supported by being suspended from the support frame 34. An opening 35a that exposes the connecting portion 47 upward is provided in the front and rear frames 35 of the support frame 34 above the connecting portion 47.

[0060] An upper portion of the motor 15 is connected to the support frame 34 (connection portion 47). A rear portion of the motor 15 is connected to the main frame 10 via a gear case 44, and a rear portion of the motor 15 is connected to the continuously variable transmission case 11 and the transmission case 12 via the gear case 44.

[0061] The motor 15 is located below the lower end of the bonnet 4 and the support frame 34 (front and rear frames 36) when viewed from the side (see Figures 1 and 4), and can be seen through the gap between the lower end of the bonnet 4 and the support frame 34 (front and rear frames 36) and the upper end of the main frame 10. With the above configuration, the motor 15 is provided outside the hood 4.

[0062] (Inverter support structure) As shown in Figures 4, 5, and 6, the inverter 14 is bolted to the right and left support members 43 and supported on the main frame 10, and is located adjacent to the motor 15 in the fore-and-aft direction, and is located below the front of the support frame 34 (between the left and right frames 37, 38).

[0063] As shown in Figures 8 and 11, the lower part 45a of the rising portion 45 (corresponding to the part adjacent to the inverter 14 on the support frame 34) is configured in a shape that is concave upward, and the rising portion 45 is formed in a gate shape when viewed from the front.

[0064] As shown in FIG. 6, when the DC-DC converter 17, the battery 18, the radiator 19, etc. are removed, the worker can visually observe the inverter 14 from the front through the area below the lower part 45a of the rising part 45.

[0065] With the DC-DC converter 17, battery 18, radiator 19, etc. removed, the worker can remove the inverter 14 from the main frame 10 by undoing the bolt connection between the inverter 14 and the support member 43, moving the inverter 14 forward horizontally, and passing the lower area through the lower part 45a of the rising portion 45.

[0066] After completing maintenance work on the inverter 14, the worker can move the inverter 14 horizontally from the front position of the main frame 10 toward the rear, and pass the lower area through the lower part 45a of the rising portion 45, thereby placing the inverter 14 on the support member 43 and bolting it together.

[0067] With the above configuration, the inverter 14 that supplies power from the battery 13 to the motor 15 is provided below the support frame 34 and adjacent to the motor 15 . The portion of the support frame 34 adjacent to the inverter 14 (rising portion 45) is configured to have a shape that is concave upward, and is configured to have a shape that allows the inverter 14 to move in the horizontal direction. The portion of the support frame 34 adjacent to the inverter 14 (the rising portion 45) is the portion of the support frame 34 located on the opposite side of the inverter 14 from the motor 15.

[0068] (Support structure of the floor section of the support frame) 1 and 2, the driver's section 5 and the floor section 8 of the driver's section 5 are provided rearward of the battery 13 and the support frame 34. The right front section 8a and the left front section 8b of the floor section 8 extend forward and diagonally upward to positions adjacent to the right rear section and the left rear section of the battery 13 and the support frame 34.

[0069] 8 to 11, there are provided right and left floor frames 49. The floor frames 49 are configured by connecting a channel-shaped support portion 49b to a flat plate-shaped base portion 49a.

[0070] Base plate portions 49a of the right and left floor frames 49 are connected to the right rear and left rear portions of the support frame 34 (front-rear frames 36) by bolts 50. As shown in FIG. 7, the right front portion 8a and left front portion 8b of the floor portion 8 are supported by support portions 49b of the right and left floor frames 49 via vibration-isolating members 51. By removing the bolts 50, the floor frames 49 can be removed from the support frames 34 (front-rear frames 36).

[0071] With the above configuration, left and right floor frames 49 are provided that can support the right front portion 8a and left front portion 8b of the floor portion 8, and the left and right floor frames 49 are detachable from the right rear portion and left rear portion of the support frame 34.

[0072] (Structure of a harness connecting an inverter and a motor) 4 and 5, a harness 52 is provided, and a connector 53 is provided at the front end of the harness 52, and the connector 53 is connected to a terminal 14a at the bottom of the front of the inverter 14. A connector 54 is provided at the rear end of the harness 52, and the connector 54 is connected to a terminal 15a at the front of the motor 15.

[0073] 5, 6, and 7, the harness 52, connectors 53, 54, terminals 14a of the inverter 14, and terminals 15a of the motor 15 are provided between the right and left main frames 10 so as to overlap with the right and left main frames 10 in a side view. A flat cover 55 is connected across the lower parts of the right and left main frames 10 and is provided across the front end of the main frame 10 and a position below the terminals 15a of the motor 15.

[0074] 1 and 4, a front axle case 56 that supports the front wheels 1 is supported at the front part of the cover 55, and the transmission shaft 31 (see FIG. 3) extends forward with its lower side relative to the cover 55 and is connected to a front wheel differential device 32 (see FIG. 3) housed in the front axle case 56. The water pump 20 described above is attached to the upper surface of the front part of the cover 55.

[0075] 5 and 7, an opening 55a for cleaning and inspection is provided in the cover 55 in a portion between the motor 15 and the front axle case 56 (a portion between the connectors 53 and 54). A flat lid portion 57 is provided, and the lid portion 57 is attached to the cover 55 with bolts 58, thereby closing the opening 55a of the cover 55. By removing the bolts 58, the lid portion 57 can be removed from the cover 55, and the opening 55a of the cover 55 can be exposed.

[0076] With the above configuration, DC power from battery 13 is converted to AC power in inverter 14 and supplied from inverter 14 to motor 15 via harness 52. Thus, harness 52 is provided to supply power from battery 13 to motor 15. A connector 54 is provided at an end of harness 52 and connected to motor 15.

[0077] A cover 55 that covers the harness 52, the connectors 53, 54, the terminals 14a of the inverter 14, and the terminals 15a of the motor 15 is provided below the harness 52 and the connectors 53, 54.

[0078] An opening 55a for cleaning and inspection is provided in the cover 55. A lid portion 57 is provided which is attached to the cover 55 to close the opening 55a, and the lid portion 57 is removable from the cover 55.

[0079] (Configuration of locking member of harness connector) 12 and 13, a locking member 59 is provided on the connector 54 and is provided above the connector 54. As shown in FIGS. 5 and 7, an operator can visually check the connector 54 and the locking member 59 through the gap between the lower end of the hood 4 and the upper end of the main frame 10 by looking diagonally downward from an upper position on the right and left lateral sides of the fuselage 3.

[0080] The locking member 59 is supported by the connector 54 so as to be swingable around an axis P1 along the left-right direction, and can be manually operated between a holding position A1, which maintains the connection between the connector 54 and the terminal 15a of the motor 15, and a release position A2, which allows the connector 54 to be separated from the terminal 15a of the motor 15.

[0081] The holding position A1 is set to a position that is almost in contact with the upper part of the connector 54, and is set to a position further forward from the motor 15 than the release position A2. The release position A2 is set to a position further upward from the connector 54 than the holding position A1, and is set to a position closer to the motor 15 than the holding position A1.

[0082] When connecting the connector 54 to the terminal 15a of the motor 15, the worker operates the locking member 59 to the release position A2, connects the connector 54 to the terminal 15a of the motor 15, and then operates the locking member 59 to the holding position A1. When removing the connector 54 from the terminal 15a of the motor 15, the worker operates the locking member 59 from the holding position A1 to the release position A2, and then operates the connector 54 forward from the terminal 15a of the motor 15 to remove it.

[0083] 4 and 5, similar to connector 54, connector 53 also has locking member 59 provided on the lower side of connector 53. In the state shown in FIG. 5, locking member 59 is operated to retaining position A1 in connector 53, and can be operated to release position A2 by operating locking member 59 downward and forward.

[0084] With the above configuration, a locking member 59 is provided that can be manually operated between a holding position A1 that holds the connection between the connector 54 and the motor 15 and a release position A2 that allows the connector 54 to be separated from the motor 15. The locking member 59 is provided above the connector 54, and the release position A2 is provided at a position farther from the connector 54 than the holding position A1.

[0085] (Structure relating to a restricting member for a connector connected to a motor terminal) 7, 12, and 13, a restricting member 60 is provided for the connector 54. The restricting member 60 has a first portion 60a extending horizontally and a pair of second portions 60b extending in the same vertical direction from one end and the other end of the first portion 60a.

[0086] 7, 12, and 13 show a state in which the lower part of the second part 60b of the regulating member 60 is attached to the cover 55 by a bolt 61 (corresponding to a fastener), and the regulating member 60 is attached to the regulating position B1.

[0087] When the regulating member 60 is attached to the regulating position B1, a cover 55 that covers the regulating member 60 is provided below the regulating member 60, and the regulating member 60 is provided between the right and left main frames 10 so that it overlaps with the right and left main frames 10 in a side view.

[0088] When the restricting member 60 is attached to the restricting position B1, the first portion 60a of the restricting member 60 is provided along the left-right direction above the connector 54 and the locking member 59 operated to the holding position A1, and is provided across the entire width of the connector 54 and the locking member 59 operated to the holding position A1. The second portion 60b of the restricting member 60 is provided along the up-down direction laterally outward on the right and left sides of the connector 54 and the locking member 59 operated to the holding position A1.

[0089] When the restricting member 60 is attached to the restricting position B1, the first portion 60a of the restricting member 60 is located in the operation path of the locking member 59 that extends between the holding position A1 and the release position A2. As a result, even if the locking member 59 attempts to move from the holding position A1 to the release position A2, the locking member 59 comes into contact with the restricting member 60 (first portion 60a), thereby stopping the movement of the locking member 59 and preventing the locking member 59 from moving to the release position A2.

[0090] An operator can remove the restricting member 60 from the cover 55 (restricting position B1) by removing the bolt 61 with a tool such as a wrench (not shown). By removing the restricting member 60 from the cover 55 (restricting position B1), the operator can operate the locking member 59 from the holding position A1 to the release position A2, and can remove the connector 54 from the terminal 15a of the motor 15.

[0091] With the above configuration, the restricting member 60 is provided in the operation path of the locking member 59 spanning the holding position A1 and the release position A2, thereby preventing the locking member 59 from being operated from the holding position A1 to the release position A2, and the restricting member 60 is removable. The restricting member 60 is provided across the entire width of the locking member 59 operated to the holding position A1. A bolt 61 (fixing device) for attaching the restricting member 60 is provided, and the restricting member 60 can be removed by removing the bolt 61 (fixing device) with a tool.

[0092] The restricting member 60 is provided with a first portion 60a extending horizontally and a pair of second portions 60b extending in the same vertical direction from one end and the other end of the first portion 60a. The first portion 60a is provided above the connector 54, and the second portion 60b is provided laterally outward from the connector 54, and a lower portion of the second portion 60b is attached to the cover 55.

[0093] (First Alternative Embodiment of the Invention) In the support frame 34 , the connecting portion 47 may be provided on the front and rear frames 36 , and openings 35 a may be provided in the front and rear frames 36 of the support frame 34 above the connecting portion 47 . A plurality of connecting portions 47 may be provided on the front and rear frames 35, 36 and left and right frames 37, 38, 39 of the support frame 34, and openings 35a may be provided above the connecting portions 47 on the front and rear frames 35, 36 and left and right frames 37, 38, 39. With the above-described configuration, the opening 35a is provided in any one of the plurality of front and rear frames 35, 36 and the plurality of left and right frames 37, 38, 39.

[0094] (Second Alternative Embodiment of the Invention) The connecting portion 47 may be eliminated. In this configuration, the motor 15 can be directly connected to the support frame 34 (front / rear frames 35, 36 and left / right frames 37, 38, 39) by connecting bolts 48. The motor 15 can be suspended from the support frame 34 (front / rear frames 35, 36 and left / right frames 37, 38, 39) by a suspension member (not shown).

[0095] (Third Alternative Embodiment of the Invention) The gear case 44 connected to the right and left main frames 10 may be located in front of the motor 15, so that the upper part of the motor 15 is connected to the connecting part 47 and the front part of the motor 15 is connected to the main frame 10 via the gear case 44.

[0096] The positions of the inverter 14 and the motor 15 may be reversed so that the motor 15 is provided below the front of the support frame 34 and the inverter 14 is provided below the rear of the support frame 34.

[0097] (Fourth Alternative Embodiment of the Invention) In the support frame 34, the rising portions 45, 46 may be eliminated. According to this configuration, the battery 13 is placed on the support frame 34 and is connected to the front and rear frames 35, 36 and the left and right frames 37, 38, 39 of the support frame 34 by bolts.

[0098] (Fifth Alternative Embodiment of the Invention) In the support frame 34, the lower portions of the rising portions 46 and the lower portions of the front and rear frames 36 may be configured to have an upwardly recessed shape.

[0099] According to this configuration, the portions of the support frame 34 adjacent to the inverter 14 become the rising portions 46 of the support frame 34 and the front and rear frames 36 . By removing the right or left leg 40 and connecting plate 41 of the support frame 34 without removing the DC-DC converter 17, battery 18, radiator 19, etc., the inverter 14 can be moved horizontally to the right or left and passed through the lower area of ​​the rising portion 46 and the lower part of the front and rear frames 36, thereby removing the inverter 14 from the main frame 10.

[0100] (Sixth Alternative Embodiment of the Invention) As shown in FIG. 14, the restricting member 60 may be formed in the shape of a straight rod. According to this configuration, the right and left ends of the regulating member 60 are attached to the right and left main frames 10 with the bolts 61, whereby the regulating member 60 is attached to the regulating position B1.

[0101] With the above configuration, the harness 52 and connectors 53, 54, the terminal 14a of the inverter 14, and the terminal 15a of the motor 15 are arranged between the right and left main frames 10 so as to overlap with the right and left main frames 10 in a side view, and the regulating member 60 is attached across the left and right main frames 10.

[0102] (Seventh Alternative Embodiment of the Invention) In the restricting member 60 shown in FIGS. 7, 12, and 13 (sixth embodiment of the invention), the restricting member 60 may be configured as follows, instead of being completely removed from the cover 55 (main frame 10).

[0103] By removing one end (one second part 60b) of the regulating member 60 and changing the posture of the regulating member 60 while keeping the other end (the other second part 60b) of the regulating member 60 attached to the cover 55 (main frame 10), the locking member 59 can be operated from the holding position A1 to the release position A2.

[0104] According to this configuration, when the posture of the restricting member 60 is changed from the restricting position B1, the restricting member 60 is removed from the restricting position B1. The other end (the other second portion 60b) of the restricting member 60 remains attached to the cover 55 (the main frame 10), so the restricting member 60 will not be lost.

[0105] (Eighth Alternative Embodiment of the Invention) In the locking member 59 shown in Figures 12 and 13, the positional relationship between the holding position A1 and the release position A2 may be reversed so that the release position A2 is set at a position that roughly contacts the upper part of the connector 54, and the holding position A1 is set at a position that is further upward and away from the connector 54 than the release position A2.

[0106] According to the above-described configuration, when the restricting member 60 is attached to the restricting position B1, the restricting member 60 may be configured to be located between the connector 54 and the locking member 59 that has been operated to the holding position A1. As a result, even if the locking member 59 attempts to move from the holding position A1 to the release position A2 so as to approach the connector 54, the movement of the locking member 59 is stopped by the locking member 59 hitting the regulating member 60, and the locking member 59 cannot move to the release position A2.

[0107] (Ninth Alternative Embodiment of the Invention) A locking member 59 shown in FIGS. 12 and 13 may be provided below the connector 54. The locking member 59 in the sixth to eighth alternative embodiments of the invention may be provided below the connector 54. According to this configuration, as shown in (sixth embodiment of the invention) and in FIG. 14, it is preferable that the restricting member 60 is provided below the connector 54 and the locking member 59.

[0108] (Tenth Alternative Embodiment of the Invention) 12 and 13 may be provided on the motor 15. The locking members 59 of (Sixth Alternative Embodiment of the Invention) to (Ninth Alternative Embodiment of the Invention) may be provided on the motor 15. According to this configuration, when the connector 54 is removed from the terminal 15 a of the motor 15 , the locking member 59 remains in the motor 15 .

[0109] (Eleventh Alternative Embodiment of the Invention) 12 and 13 may be configured to slide horizontally or vertically between the holding position A1 and the release position A2. The locking members 59 of (sixth alternative embodiment of the invention) to (tenth alternative embodiment of the invention) may be configured to slide horizontally or vertically between the holding position A1 and the release position A2.

[0110] (Twelfth Alternative Embodiment of the Invention) 12 and 13 may be applied to the locking member 59 (see FIG. 5) of the connector 53 connected to the terminal 14a of the inverter 14. The configurations of the locking member 59 of (sixth alternative embodiment of the invention) to (eleventh alternative embodiment of the invention) may be applied to the locking member 59 (see FIG. 5) of the connector 53 connected to the terminal 14a of the inverter 14.

[0111] (13th Alternative Embodiment of the Invention) Instead of the rear wheels 2, crawler traveling devices (not shown) may be provided as traveling devices. Instead of the front wheels 1 and rear wheels 2, crawler traveling devices (not shown) may be provided as traveling devices. [Industrial Applicability]

[0112] The present invention can be applied not only to tractors but also to other electric work vehicles such as electric carts and transport vehicles. [Explanation of symbols]

[0113] 1 Front wheel (running gear) 2 Rear wheels (running gear) 5. Driving section 8 Floor section 8a right front 8b Left front 10 Main Frame 13 Battery 14 Inverter 15 motor 34 Support frame 35 Front and rear frame (base part) 35a opening 36 Front and rear frame (base part) 37 Left and right frames (base part) 38 Left and right frames (base part) 39 Left and right frames (base part) 45 Rising section 46 Rising section 47 Connecting part 49 Floor Frame

Claims

1. Running gear and a main frame supporting the traveling device; A battery, a support frame attached to the main frame and on which the battery is placed, thereby supporting the battery on the main frame; a motor that operates using power from the battery and drives the traveling device, the motor is suspended and supported by the support frame, a connecting portion that protrudes downward from the support frame and to which the motor is connected; An electric work vehicle in which an opening is provided in a portion of the support frame above the connecting portion, exposing the connecting portion upward.

2. The support frame is provided with a plurality of front-rear frames extending along the front-rear direction and spaced apart from each other in the left-right direction, and a plurality of left-right frames extending along the left-right direction and spaced apart from each other in the front-rear direction, The electric work vehicle according to claim 1 , wherein the opening is provided in one of the plurality of front and rear frames and the plurality of left and right frames.

3. A running device, a main frame supporting the traveling device; A battery, a support frame attached to the main frame and on which the battery is placed, thereby supporting the battery on the main frame; a motor that operates using power from the battery and drives the traveling device, the motor is suspended and supported by the support frame, An electric work vehicle in which an upper portion of the motor is connected to the support frame, and a front or rear portion of the motor is connected to the main frame.

4. A running device; a main frame supporting the traveling device; A battery, a support frame attached to the main frame and on which the battery is placed, thereby supporting the battery on the main frame; a motor that operates using power from the battery and drives the traveling device, the motor is suspended and supported by the support frame, the support frame is provided with a base portion on which the battery is placed and a rising portion that rises from the base portion and surrounds a lower outer periphery of the battery, an inverter that supplies power from the battery to the motor is provided below the support frame and adjacent to the motor; an electric work vehicle, wherein a portion of the support frame adjacent to the inverter is configured in a shape that allows the inverter to move in a horizontal direction;

5. 5. The electric work vehicle according to claim 4, wherein a portion of the support frame adjacent to the inverter is configured to have an upwardly recessed shape.

6. 5. The electric work vehicle according to claim 4, wherein the portion of the support frame adjacent to the inverter is a portion of the support frame located on the opposite side of the motor with respect to the inverter.

7. A running device; a main frame supporting the traveling device; A battery, a support frame attached to the main frame and on which the battery is placed, thereby supporting the battery on the main frame; a motor that operates using power from the battery and drives the traveling device, the motor is suspended and supported by the support frame, A driving unit is provided on the rear side of the support frame, a right front portion and a left front portion of a floor portion of the driving section extending forward to positions adjacent to the right rear portion and the left rear portion of the support frame; left and right floor frames capable of supporting the right front portion and the left front portion of the floor portion are provided; The left and right floor frames are detachably attached to the right rear and left rear of the support frame.

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