Electric work vehicle

Abstract

An electric work vehicle is provided with a main frame (10) that supports a travel device, and a battery (13). The device is provided with a support frame (34) which supports the battery (13) on the main frame (10) by being attached to the main frame (10) and having the battery (13) placed thereon. The electric vehicle is provided with a motor (15) which operates by using electric power from a battery (13) and drives a traveling device, and the motor (15) is suspended and supported by a support frame (34).

Description

Technical Field

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

[0002] Regarding electric work vehicles, as disclosed in Patent Document 1, for example, there is an electric work vehicle in which a battery is supported by a main frame, and an electric motor that drives a traveling device is supported by the main frame so as to be disposed below the battery.

[0003] Prior Art Documents

[0004] Patent Documents

[0005] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2020 - 104568 (JP2020104568A). Summary of the Invention

[0006] Technical Problem to be Solved by the Invention

[0007] In the electric work vehicle of Patent Document 1, in order to support the electric motor by the main frame, since various frames are connected across the electric motor and the main frame, there is room for improvement in terms of simplification of the structure.

[0008] An object of the present invention is to simplify the support structure of an electric motor in an electric work vehicle.

[0009] Technical Solution for Solving the Technical Problem

[0010] The electric work vehicle of the present invention includes: a traveling device; a main frame that supports the traveling device; a battery; a support frame that supports the battery on the main frame by being mounted on the main frame; and an electric motor that operates using power from the battery and drives the traveling device, wherein the electric motor is suspended and supported by the support frame.

[0011] According to the present invention, the battery is supported on the main frame by the support frame, and the electric motor is suspended and supported by the support frame. The electric motor is supported on the main frame via the support frame, and the support frame has a function of supporting the battery on the main frame and a function of supporting the electric motor on the main frame.

[0012] According to the present invention, by the support frame having a function of supporting the battery on the main frame and a function of supporting the electric motor on the main frame, it is possible to achieve the shared use of components and to simplify the support structure of the electric motor.

[0013] In the present invention, preferably, a connecting portion that protrudes downward and is connected to the electric motor is provided on the support frame, and an opening portion that exposes the connecting portion upward is provided in a portion above the connecting portion on the support frame.

[0014] According to the present invention, the connecting portion protrudes downward from the support frame. Therefore, even if a connecting member for connecting the motor to the connecting portion is provided on the connecting portion, the connecting member does not protrude upward from the support frame. Thus, in a state where the battery is placed on the support frame, the connecting member does not interfere with the battery.

[0015] According to the present invention, an opening for exposing the connecting portion upward is provided in the support frame. Therefore, an operator can easily visually confirm the state of the connecting portion from above through the opening.

[0016] In the present invention, a plurality of front - rear frames and a plurality of left - right frames are provided in the support frame. The front - rear frames extend in the front - rear direction and are spaced apart from each other in the left - right direction. The left - right frames extend in the left - right direction and are spaced apart from each other in the front - rear direction. The opening is provided in any one of the plurality of front - rear frames and the plurality of left - right frames.

[0017] According to the present invention, the support frame is configured in a lattice shape with front - rear frames and left - right frames. In a state where the battery is removed from the support frame, an operator can see below through the gaps between the front - rear frames and the gaps between the left - right frames.

[0018] Thus, an operator can not only visually confirm the state of the connecting portion from above through the opening, but also visually confirm the state of the connecting portion through the gaps between the front - rear frames and the gaps between the left - right frames. By configuring the support frame in a lattice shape, weight reduction of the support frame can be achieved.

[0019] In the present invention, preferably, the upper part of the motor is connected to the support frame, and the front part or the rear part of the motor is connected to the main frame.

[0020] According to the present invention, in addition to the upper part of the motor being connected to the support frame, the front part or the rear part of the motor is connected to the main frame. Therefore, the support strength of the motor is improved.

[0021] In the present invention, preferably, a base portion on which the battery is placed and a standing portion that stands up from the base portion and surrounds the lower outer periphery of the battery are provided in the support frame. A converter for supplying power from the battery to the motor is provided near the side of the motor below with respect to the support frame. A portion of the support frame adjacent to the converter is configured in a shape that allows the converter to move along the horizontal direction.

[0022] According to the present invention, in a state where the battery is placed on the base portion of the support frame, due to the standing portion of the support frame, the lower outer periphery of the battery is surrounded. Therefore, the support stability of the battery in a state where the battery is placed on the support frame is improved.

[0023] According to the present invention, a converter that supplies electric power from a battery to an electric motor is disposed on the lower side with respect to a support frame in a manner adjacent to the electric motor.

[0024] In this case, for the maintenance operation of the converter, an operator moves the converter in the horizontal direction and sometimes removes it from or returns it to a position below the support frame.

[0025] According to the present invention, a portion of the support frame adjacent to the converter is configured in a shape that allows the converter to move in the horizontal direction. Therefore, as described above, when the operator moves the converter in the horizontal direction, the contact between the converter and the portion of the support frame adjacent to the converter is reduced, and the workability of the maintenance operation is improved.

[0026] In the present invention, preferably, a portion of the support frame adjacent to the converter is configured in a shape that is recessed upward.

[0027] According to the present invention, by configuring a portion of the support frame adjacent to the converter in a simple shape that is recessed upward, a structure in which the contact between the converter and the portion of the support frame adjacent to the converter is reduced can be easily obtained, and the structure of the support frame can be simplified.

[0028] In the present invention, preferably, a portion of the support frame adjacent to the converter is a portion of the support frame on the opposite side of the electric motor with respect to the converter.

[0029] When the operator removes the converter as described above, the operator moves the converter in a direction opposite to the electric motor from a position below the support frame. When installing the converter, the operator moves the converter from a position on the opposite side of the electric motor with respect to the support frame to a position below the support frame. Thus, it is difficult for the electric motor to interfere with the movement of the converter, and the workability of the maintenance operation is improved.

[0030] In the present invention, preferably, a driver's cab is mounted on the rear side with respect to the support frame, the right front portion and the left front portion of the floor portion of the driver's cab extend forward to positions adjacent to the right rear portion and the left rear portion of the support frame, and left and right floor frames capable of supporting the right front portion and the left front portion of the floor portion are provided, and the left and right floor frames are detachable with respect to the right rear portion and the left rear portion of the support frame.

[0031] In an electric work vehicle, a driver's cab is disposed on the rear side with respect to a support frame, and the right front portion and the left front portion of the floor portion of the driver's cab sometimes extend forward to positions adjacent to the right rear portion and the left rear portion of the support frame.

[0032] According to the present invention, the right front part and the left front part of the floor portion are supported by the left and right floor frames installed at the right rear part and the left rear part of the support frame, so the support stability of the floor portion is improved.

[0033] According to the present invention, the floor frame can be detachably attached to the support frame. Therefore, for maintenance work, when performing the removal work and installation work of the floor portion, the floor frame can be removed in advance. Alternatively, the removal and installation of the floor frame can be performed together with the removal work and installation work of the floor portion.

[0034] Thus, according to the operation modes of the removal work and installation work of the floor portion and the operation mode of the maintenance work, the removal and installation of the floor frame can be carried out. Therefore, the removal work, installation work, and maintenance work of the floor portion become easy to perform, and the workability is improved. Description of the Drawings

[0035] Figure 1 It is a left side view of the tractor.

[0036] Figure 2 It is a top view of the tractor.

[0037] Figure 3 It is a block diagram showing the transmission system from the motor to the front wheels and the rear wheels.

[0038] Figure 4 It is a left side view showing the inside of the hood.

[0039] Figure 5 It is a left side view near the converter and the motor.

[0040] Figure 6 It is a longitudinal sectional front view near the support frame and the converter.

[0041] Figure 7 It is a longitudinal sectional front view near the motor.

[0042] Figure 8 It is an exploded perspective view of the support frame and the motor.

[0043] Figure 9 It is a top view of the support frame.

[0044] Figure 10 It is a left side view of the support frame.

[0045] Figure 11 It is a front view of the support frame.

[0046] Figure 12 It is a top view near the terminals, connectors, and limiting components of the motor.

[0047] Figure 13It is a left longitudinal sectional view near the terminal of the motor, the connector, and the restricting member.

[0048] Figure 14 It is a left longitudinal sectional view near the terminal of the motor, the connector, and the restricting member in the sixth different embodiment of the present invention. Detailed implementation manners

[0049] In Figures 1 - 14 a tractor which is an example of an electric work vehicle is shown. In Figures 1 - 14 F represents the front direction, B represents the rear direction, U represents the upper direction, D represents the lower direction, R represents the right direction, and L represents the left direction.

[0050] (Overall structure of the tractor)

[0051] As Figure 1 and Figure 2 shown, the body 3 is supported by the right and left front wheels 1 (equivalent to the traveling device) and the right and left rear wheels 2 (equivalent to the traveling device). A hood 4 is provided at the front of the body 3, and a driver's cab 5 is provided at the rear of the body 3. In the driver's cab 5, a steering wheel 6 for steering the front wheels 1, a driver's seat 7, a floor portion 8, and a rollover protection frame 9 are provided.

[0052] The body 3 has right and left main frames 10, a continuously variable transmission case 11, a transmission case 12, etc. 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 arranged in the front-rear direction. The front wheels 1 are supported by the main frames 10, and the rear wheels 2 are supported by the transmission case 12.

[0053] With the above structure, the front wheels 1 (traveling device) and the rear wheels 2 (traveling device), and the main frames 10 supporting the front wheels 1 (traveling device) are installed on the tractor.

[0054] (Structure of the front part of the body)

[0055] As Figure 1 shown, the battery 13, the converter 14, and the motor 15 are supported by the main frame 10.

[0056] As Figure 4 shown, a connection portion 16 is provided at the left front of the battery 13, and a charger (not shown) of an external power source (not shown) is connected to the connection portion 16. The power of the external power source is charged from the connection portion 16 to the battery 13. The power of the battery 13 is supplied to the converter 14, and in the converter 14, the direct current of the battery 13 is converted into alternating current and supplied to the motor 15. Thus, the motor 15 is driven.

[0057] As Figure 2 and Figure 4As shown, the DC-DC converter 17, battery 18, radiator 19, water pump 20, etc. are arranged at the front part of the main frame 10. The battery 13, converter 14, connection part 16, DC-DC converter 17, battery 18, radiator 19, etc. are covered by the engine hood 4.

[0058] With the above configuration, the battery 13 and the engine hood housing the battery 13 are installed on the tractor.

[0059] The power of the battery 13 is supplied to the DC-DC converter 17 and is stepped down to 12V in the DC-DC converter 17. The power stepped down to 12V is supplied to the battery 13 and then from the battery 13 to the battery 18. Various devices (not shown) equipped on the tractor operate with the 12V power of the battery 18.

[0060] The water pump 20 operates, and the cooling water generated in the radiator 19 is supplied to the water pump 20 via the pipeline 21 and from the water pump 20 to the converter 14. The cooling water that has passed through the inside of the converter 14 is supplied to the motor 15 via the pipeline 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 the pipeline 23.

[0061] (Configuration of the drive system for the front and rear wheels)

[0062] As Figure 1 and Figure 3 shown, the 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 the transmission shaft 25. The continuously variable transmission 24 can perform continuously variable transmission in the forward and reverse directions and is operated by the shift pedal 26 ( Figure 2 refer to) provided on the floor part 8.

[0063] The sub-transmission 27, rear-wheel differential device 28, front-wheel transmission device 29, right and left brakes 30 are housed inside the transmission case 12. The power of the continuously variable transmission 24 is transmitted to the sub-transmission 27 and from the sub-transmission 27 via the rear-wheel differential device 28 to the rear wheel 2.

[0064] The power branched off between the sub-transmission 27 and the rear-wheel differential device 28 is transmitted to the front-wheel transmission device 29, from the front-wheel transmission device 29 via the transmission shaft 31 to the front-wheel differential device 32, and from the front-wheel differential device 32 to the front wheel 1.

[0065] When operating the front wheels 1 within the range of the right and left set angles from the straight-ahead position, the front-wheel speed-changing device 29 can drive the front wheels 1 and the rear wheels 2 at the same speed. When steering the front wheels 1 to the right or left beyond the right and left set angles, the front-wheel speed-changing device 29 can drive the front wheels 1 at a speed higher than that of the rear wheels 2.

[0066] With the above configuration, there is provided a motor 15 that operates using the power from the battery 13 and drives the front wheels 1 (traveling devices) and the rear wheels 2 (traveling devices), and the front wheels 1 (traveling devices) and the rear wheels 2 (traveling devices) driven by the motor 15 are mounted on the tractor.

[0067] A right brake 30 is provided in the power transmission system from the rear-wheel differential device 28 to the right rear wheel 2, and a left brake 30 is provided in the power transmission system from the rear-wheel differential device 28 to the left rear wheel 2. A right brake pedal 33 for operating the right brake 30 and a left brake pedal 33 for operating the left brake 30 are provided at the left front portion 8b of the floor portion 8 (see Figure 2 ). When turning to the right (left), the right (left) brake pedal 33 on the turning center side is stepped on, and by braking the right (left) brake 30, a small-radius turn can be made.

[0068] (Configuration of the support frame for supporting the battery)

[0069] As Figures 4 - 7 shown, the support frame 34 is mounted on the main frame 10, and the battery 13 is placed and connected to the support frame 34.

[0070] As Figures 8 - 11 shown, the support frame 34 includes front and rear frames 35, 36 (equivalent to the base), left and right frames 37, 38, 39 (equivalent to the base), right and left leg portions 40, right and left connecting plates 41, right and left brackets 42, upright portions 45, 46, etc.

[0071] The front and rear frames 35 and 36 are angle-shaped members in the front-rear direction. The left and right frames 37 are flat plate-shaped members in the left-right direction. The left and right frames 38 and 39 are angle-shaped members in the left-right direction. The front frame 35 and the right front frame 36 are arranged at intervals in the left-right direction. Also, the front frame 35 and the left front frame 36 are arranged at intervals in the left-right direction. With the above structure, the front frame 35, the right front frame 36, and the left front frame 36 are arranged at intervals in the left-right direction. The left and right frames 37, the left and right frames 38, and the left and right frames 39 are arranged at intervals in the front-rear direction. The front and rear frames 35 and 36 and the left and right frames 37, 38, and 39 are connected. With the above structure, the support frame 34 (the front and rear frames 35 and 36 and the left and right frames 37, 38, and 39) is configured in a lattice shape when viewed from above.

[0072] Two channel-shaped legs 40 are connected to the front part of the right front frame 36. A connecting plate 41 in the front-rear direction straddles and connects to the lower parts of the two legs 40. Two channel-shaped legs 40 are connected to the front part of the left front frame 36. A connecting plate 41 in the front-rear direction straddles and connects to the lower parts of the two legs 40. A right bracket 42 is connected to the rear part of the right front frame 36, and a left bracket 42 is connected to the rear part of the left front frame 36.

[0073] A flat plate-shaped upright portion 45 is bolted to the left and right frames 37 and stands up upward from the left and right frames 37. A flat plate-shaped right upright portion 46 is bolted to the right front frame 36. Also, a flat plate-shaped left upright portion 46 is bolted to the left front frame 36. With the above structure, the left and right upright portions 46 stand up upward from the left and right front frames 36.

[0074] (Support structure of the support frame on the main frame)

[0075] As Figures 4 - 7 shown, a right flat plate-shaped support member 43 is connected in the front-rear direction to the upper front part of the right main frame 10. Also, a left flat plate-shaped support member 43 is connected in the front-rear direction to the upper front part of the left main frame 10. The gear case 44 straddles and connects to the right and left main frames 10 in the front-rear direction.

[0076] The right leg 40 and the connecting plate 41 of the support frame 34 are bolted to the right support member 43, and the left leg 40 and the 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.

[0077] As described above, the support frame 34 is installed on the main frame 10, and the front and rear frames 36 of the support frame 34 are located at a position slightly away from the upper end of the main frame 10 upward.

[0078] (Support state of the battery on the support frame)

[0079] As Figures 4 - 7 shown, the outer peripheral portion of the lower part of the battery 13 is surrounded by the upright portions 45, 46 of the support frame 34 through the front and rear frames 35, 36 and the left and right frames 37, 38, 39 of the support frame 34 on which the battery 13 is placed.

[0080] The front part of the lower part of the battery 13 is bolt - connected to the upright portion 45, the lower right part and the lower left part of the battery 13 are bolt - connected to the upright portion 46, and the lower rear part of the battery 13 is bolt - connected to the left and right frame 39, so that the battery 13 is connected to the support frame 34.

[0081] According to the above structure, there is a support frame 34 which is installed on the main frame 10, and by placing the battery 13, the battery 13 is supported on the main frame 10.

[0082] A plurality of front and rear frames 35, 36 and a plurality of left and right frames 37, 38, 39 are provided on the support frame 34. The plurality of front and rear frames 35, 36 extend in the front - rear direction and are arranged at intervals in the left - right direction. The plurality of left and right frames 37, 38, 39 extend in the left - right direction and are arranged at intervals in the front - rear direction.

[0083] On the support frame 34, there are provided front and rear frames 35, 36 (base portions) on which the battery is placed, left and right frames 37, 38, 39 (base portions), and upright portions 45, 46 which stand up from the front and rear frames 35, 36 (base portions) and the left and right frames 37, 38, 39 (base portions) and surround the outer peripheral portion of the lower part of the battery 13.

[0084] (Support structure of the motor)

[0085] As Figure 8 、 9 、10 shown, a connecting portion 47 is provided at the rear part of the front and rear frame 35 of the support frame 34 (between the left and right frames 38 and the left and right frame 39).

[0086] The connecting portion 47 is formed by bending a plate material into a channel shape, and is connected to the lower surface portion of the front and rear frame 35 of the support frame 34, and is provided on the support frame 34 so as to protrude downward from the front and rear frame 35 of the support frame 34.

[0087] The connecting bolt 48 is inserted into the opening of the connecting portion 47, and an opening 35a is formed above the connecting portion 47 on the front and rear frame 35 of the support frame 34. An operator can insert a tool such as a wrench into the opening 35a of the front and rear frame 35, and perform the tightening operation and removal operation of the connecting bolt 8 through the tool such as a wrench.

[0088] As shown Figure 4 in 5 ,

[0089] As shown in FIGS. 7 - 10, the motor 15 is disposed on the lower side between the right and left frames 38 and 39 at the rear part of the front and rear frames 35 of the support frame 34, and is disposed between the right and left main frames 10. The motor 15 is connected to the connecting portion 47 by the connecting bolts 48, and the rear part of the motor 15 is bolt - connected to the gear case 44.

[0090] With the above - described configuration, a connecting portion 47 that protrudes downward and to which the motor 15 is connected is provided on the support frame 34, and the motor 15 is suspended and supported by the support frame 34. An opening 35a for exposing the connecting portion 47 upward is provided in a portion above the connecting portion 47 on the support frame 34, and the opening 35a is provided in the front and rear frames 35 of the support frame 34.

[0091] The upper part of the motor 15 is connected to the support frame 34 (connecting portion 47). The rear part of the motor 15 is connected to the main frame 10 via the gear case 44, and the rear part of the motor 15 is connected to the continuously variable transmission case 11 and the transmission case 12 via the gear case 44. Figure 1 and Figure 4 In a side view (refer to

[0092] ), the motor 15 is located at a position lower than the lower end of the engine cover 4 and the support frame 34 (front and rear frames 36), and the motor 15 can be seen through the gap between the lower end of the engine cover 4 and the support frame 34 (front and rear frames 36) and the upper end of the main frame 10.

[0093] (Support structure of the converter)

[0094] As shown Figure 4 in 5 ,

[0095] As shown Figure 8 in Figure 11 and

[0096] As shown Figure 6As shown, when the DC-DC converter 17, the battery 18, and the radiator 19 are removed, the operator can see the converter 14 from the front through the lower area with respect to the lower part 45a of the upright portion 45.

[0097] In a state where the DC-DC converter 17, the battery 18, the radiator 19, etc. are removed, the operator removes the bolt connection between the converter 14 and the support member 43, moves the converter 14 forward in the horizontal direction, and through the lower area with respect to the lower part 45a of the upright portion 45, whereby the converter 14 can be removed from the main frame 10.

[0098] After the maintenance work of the converter 14 and the like is completed, the operator moves the converter 14 backward in the horizontal direction from the front position of the main frame 10, and through the lower area with respect to the lower part 45a of the upright portion 45, whereby the converter 14 can be placed on the support member 43 and bolt-connected.

[0099] With the above configuration, the converter 14 that supplies power from the battery 13 to the motor 15 is disposed near the lateral side of the lower motor 15 with respect to the support frame 34.

[0100] The portion (upright portion 45) of the support frame 34 adjacent to the converter 14 is configured in a shape that is recessed upward and is configured to allow the converter 14 to move in the horizontal direction.

[0101] The portion (upright portion 45) of the support frame 34 adjacent to the converter 14 is the portion of the support frame 34 on the opposite side of the motor 15 with respect to the converter 14.

[0102] (Support structure of the floor portion on the support frame)

[0103] As Figure 1 and Figure 2 shown, the driver's cab 5 and the floor portion 8 of the driver's cab 5 are disposed at the rear with respect to the battery 13 and the support frame 34. The right front portion 8a and the left front portion 8b of the floor portion 8 extend forward and obliquely upward to positions adjacent to the right rear portion and the left rear portion of the battery 13 and the support frame 34.

[0104] As Figures 8 - 11 shown, right and left floor frames 49 are provided. The floor frame 49 has a channel-shaped support portion 49b connected to a flat substrate portion 49a.

[0105] The substrate portions 49a of the right and left floor frames 49 are bolt-connected to the right rear portion and the left rear portion of the support frame 34 (front and rear frame 36). As Figure 7As shown, the right front portion 8a and the left front portion 8b of the floor portion 8 are supported by the support portions 49b of the right and left floor frames 49 via the vibration isolation members 51. By removing the bolts 50, the floor frame 49 can be removed from the support frame 34 (front and rear frame 36).

[0106] With the above configuration, there are provided right and left floor frames 49 capable of supporting the right front portion 8a and the left front portion 8b of the floor portion 8, and the right and left floor frames 49 can be attached to and detached from the right rear portion and the left rear portion of the support frame 34.

[0107] (Structure related to the wiring harness connecting the converter and the motor)

[0108] As Figure 4 and Figure 5 shown, a wiring harness 52 is provided. A connector 53 is provided at the front end portion of the wiring harness 52, and the connector 53 is connected to the terminal 14a at the lower portion of the front portion of the converter 14. A connector 54 is provided at the rear end portion of the wiring harness 52, and the connector 54 is connected to the terminal 15a at the front portion of the motor 15.

[0109] As Figure 5 , 6 , 7 shown, the wiring harness 52, the connectors 53, 54, the terminal 14a of the converter 14, and the terminal 15a of the motor 15 are provided between the right and left main frames 10 so as to overlap the right and left main frames 10 in side view. A flat plate-shaped housing 55 is connected across the lower portions of the right and left main frames 10 and is provided across the front end portion of the main frame 10 and the position below the terminal 15a of the motor 15.

[0110] As Figure 1 and Figure 4 shown, the front axle housing 56 supporting the front wheels 1 is supported by the front portion of the housing 55. The drive shaft 31 (refer to Figure 3 ) extends forward relative to the housing 55 at a lower position and is connected to the front wheel differential device 32 ( Figure 3 refer to) housed in the front axle housing 56. The aforementioned water pump 20 is installed on the upper surface portion of the front portion of the housing 55.

[0111] As Figure 5 and Figure 7 shown, an opening 55a for cleaning and inspection is provided in a portion of the housing 55 between the motor 15 and the front axle housing 56 (the portion between the connectors 53 and 54). A flat plate-shaped cover portion 57 is provided, and the cover portion 57 is attached to the housing 55 by bolts 58, thereby closing the opening 55a of the housing 55 with the cover portion 57. By removing the bolts 58, the cover portion 57 can be removed from the housing 55, and the opening 55a of the housing 55 can be opened.

[0112] With the above configuration, the direct current of the battery 13 is converted into alternating current in the converter 14 and supplied from the converter 14 to the motor 15 via the wire harness 52. Thus, the wire harness 52 for supplying the power from the battery 13 to the motor 15 is provided. A connector 54 is provided at the end of the wire harness 52 and is connected to the motor 15.

[0113] A housing 55 that covers the wire harness 52, the connectors 53 and 54, the terminal 14a of the converter 14, and the terminal 15a of the motor 15 is provided below the wire harness 52 and the connectors 53 and 54.

[0114] An opening 55a for cleaning inspection is provided in the housing 55. A cover 57 that closes the opening 55a by being mounted on the housing 55 is provided, and the cover 57 can be detached from the housing 55.

[0115] (Configuration related to the locking member of the wire harness connector)

[0116] As Figure 12 and Figure 13 shown, a locking member 59 is provided on the connector 54 and is provided above the connector 54. As Figure 5 and Figure 7 shown, an operator can see the connector 54 and the locking member 59 through the gap between the lower end of the engine cover 4 and the upper end of the main frame 10 by observing obliquely downward from the positions above the right and left sides of the body 3.

[0117] The locking member 59 is swingably supported on the connector 54 around an axis P1 along the left - right direction and can be manually operated within a range including a holding position A1 for holding the connection between the connector 54 and the terminal 15a of the motor 15 and a release position A2 for allowing the separation of the connector 54 from the terminal 15a of the motor 15.

[0118] The holding position A1 is set at a position substantially in contact with the upper part of the connector 54, and is set at a position farther from the motor 15 in the forward direction compared to the release position A2. The release position A2 is set at a position farther from the connector 54 in the upward direction compared to the holding position A1, and is set at a position closer to the motor 15 compared to the holding position A1.

[0119] When the operator wants to connect the connector 54 to the terminal 15a of the motor 15, with the locking member 59 operated to the release position A2, the connector 54 is connected to the terminal 15a of the motor 15, and then the locking member 59 is operated to the holding position A1.

[0120] When the operator wants to remove the connector 54 from the terminal 15a of the motor 15, after operating the locking member 59 from the holding position A1 to the release position A2, the connector 54 is operated forward from the terminal 15a of the motor 15 and removed.

[0121] As Figure 4 and Figure 5 shown, similarly to the connector 54, the locking member 59 is provided on the connector 53 in such a manner as to be disposed on the lower side with respect to the connector 53. Figure 5 The state shown is a state in which the locking member 59 is operated to the holding position A1 on the connector 53, and by operating the locking member 59 downward and forward, the locking member 59 can be operated to the release position A2.

[0122] With the above configuration, there is provided a locking member 59 that can be manually operated within a range including the holding position A1 that holds the connection between the connector 54 and the motor 15 and the release position A2 that permits the separation of the connector 54 from the motor 15.

[0123] The locking member 59 is provided on the upper side with respect to the connector 54, and the release position A2 is set at a position farther from the connector 54 than the holding position A1.

[0124] (Structure related to the restricting member for the connector connected to the terminal of the motor)

[0125] As Figure 7 , 12 , shown in FIG. 13, a restricting member 60 is provided with respect to the connector 54. The restricting member 60 has a first portion 60a extending in the horizontal direction and a pair of second portions 60b extending in the same direction in the vertical direction from one end and the other end of the first portion 60a.

[0126] Figure 7 , 12 , the state shown in FIG. 13 is a state in which the lower portion of the second portion 60b of the restricting member 60 is attached to the housing 55 by a bolt 61 (equivalent to a fixing tool), and is a state in which the restricting member 60 is installed at the restricting position B1.

[0127] In a state where the restricting member 60 is installed at the restricting position B1, the housing 55 covering the restricting member 60 is disposed on the lower side with respect to the restricting member 60, and the restricting member 60 is disposed between the right and left main frames 10 so as to overlap the right and left main frames 10 in a side view.

[0128] In a state where the restricting member 60 is installed at the restricting position B1, the first portion 60a of the restricting member 60 is disposed above the connector 54 and the locking member 59 operated to the holding position A1 in the left-right direction, and is disposed 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 disposed on the right and left lateral outsides in the up-down direction with respect to the connector 54 and the locking member 59 operated to the holding position A1.

[0129] In a state where the restricting member 60 is installed at the restricting position B1, the first portion 60a of the restricting member 60 is located on the operation path of the locking member 59 that spans the holding position A1 and the release position A2. Thus, even if the locking member 59 moves from the holding position A1 to the release position A2, the movement of the locking member 59 is blocked by the contact between the locking member 59 and the restricting member 60 (first portion 60a), and the locking member 59 cannot move to the release position A2.

[0130] The operator removes the bolt 61 by using a tool such as a wrench (not shown), and removes the restricting member 60 from the housing 55 (restricting position B1). By removing the restricting member 60 from the housing 55 (restricting position B1), the operator can operate the locking member 59 from the holding position A1 to the release position A2, and remove the connector 54 from the terminal 15a of the motor 15.

[0131] With the above configuration, there is provided a restricting member 60. By disposing it on the operation path of the locking member 59 that spans the holding position A1 and the release position A2, the operation of the locking member 59 from the holding position A1 to the release position A2 can be blocked, and the restricting member 60 can be removed. The restricting member 60 is disposed across the entire width of the locking member 59 operated to the holding position A1. There is provided a bolt 61 (fixing tool) for installing the restricting member 60. By removing the bolt 61 (fixing tool) using a tool, the restricting member 60 can be removed.

[0132] The restricting member 60 is provided with a first portion 60a and a pair of second portions 60b. The first portion 60a extends in the horizontal direction, and the pair of second portions 60b extend in the same direction in the up-down direction from one end and the other end of the first portion 60a, respectively. The first portion 60a is disposed above the connector 54, and the second portion 60b is disposed on the lateral outside of the connector 54. The lower portion of the second portion 60b is installed on the housing 55.

[0133] (First other mode of implementing the invention)

[0134] On the support frame 34, the connecting part 47 can be provided on the front and rear frames 36, and the opening part 35a can be provided above the connecting part 47 on the front and rear frames 36 of the support frame 34.

[0135] A plurality of connecting parts 47 can be provided on the front and rear frames 35, 36 and the left and right frames 37, 38, 39 of the support frame 34, and the opening part 35a can be provided above the connecting parts 47 on the front and rear frames 35, 36 and the left and right frames 37, 38, 39.

[0136] With the above configuration, the opening part 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.

[0137] (Second other mode of implementing the invention)

[0138] The connecting part 47 can also be abolished.

[0139] In this configuration, it is only necessary to directly connect the motor 15 to the support frame 34 (front and rear frames 35, 36 and left and right frames 37, 38, 39) through the connecting bolt 48. It is only necessary to suspend and support the motor 15 on the support frame 34 (front and rear frames 35, 36 and left and right frames 37, 38, 39) through a suspension member (not shown).

[0140] (Third other mode of implementing the invention)

[0141] It can be configured such that the gear case 44 connected to the right and left main frames 10 is disposed on the front side with respect to the motor 15, 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.

[0142] It can be configured to swap the positional relationship between the converter 14 and the motor 15, with the motor 15 disposed on the lower side with respect to the front part of the support frame 34 and the converter 14 disposed on the lower side with respect to the rear part of the support frame 34.

[0143] (Fourth other mode of implementing the invention)

[0144] On the support frame 34, the upright parts 45, 46 can be abolished.

[0145] According to this configuration, it is configured such that the battery 13 is placed on the support frame 34, and the battery 13 is bolt-connected to the front and rear frames 35, 36 and the left and right frames 37, 38, 39 of the support frame 34.

[0146] (Fifth other mode of implementing the invention)

[0147] On the support frame 34, the lower part of the upright part 46 and the lower part of the front and rear frames 36 can be configured to be recessed upward.

[0148] According to this configuration, the portion of the support frame 34 adjacent to the converter 14 forms the upright portion 46 of the support frame 34 and the front and rear frames 36.

[0149] By removing the right or left leg portions 40 of the support frame 34 and the connecting plate 41 without removing the DC-DC converter 17, the battery 18, the radiator 19, etc., the converter 14 is moved horizontally to the right or left, and through the lower region relative to the lower portions of the upright portion 46 and the front and rear frames 36, the converter 14 is thus removed from the main frame 10.

[0150] (Sixth other mode of implementing the invention)

[0151] As Figure 14 shown, the restricting member 60 can be formed into a straight rod shape.

[0152] With this configuration, by mounting the right end portion and the left end portion of the restricting member 60 to the right and left main frames 10 using bolts 61, the restricting member 60 is thus mounted at the restricting position B1.

[0153] With the above configuration, the wiring harness 52 and the connectors 53, 54, the terminals 14a of the converter 14, and the terminals 15a of the motor 15 are arranged between the right and left main frames 10 so as to overlap the right and left main frames 10 in a side view, and the restricting member 60 is mounted across the left and right main frames 10.

[0154] (Seventh other mode of implementing the invention)

[0155] In Figure 7 、 12 、the restricting member 60 shown in 13, the restricting member 60 of (the sixth other mode of implementing the invention), the restricting member 60 may be configured such that it is not completely removed from the housing 55 (main frame 10) as follows.

[0156] While maintaining the state where one end portion (one second portion 60b) of the restricting member 60 is removed and the other end portion (the other second portion 60b) of the restricting member 60 is mounted to the housing 55 (main frame 10), and by changing the shape of the restricting member 60, the locking member 59 can be operated from the holding position A1 to the release position A2.

[0157] According to this configuration, the shape of the restricting member 60 is changed from the restricting position B1, and thus it becomes a state where the restricting member 60 is removed from the restricting position B1. Since the other end portion (the other second portion 60b) of the restricting member 60 remains in the state of being mounted to the housing 55 (main frame 10), the restricting member 60 is not lost.

[0158] (The Eighth Other Mode of Implementing the Invention)

[0159] In Figure 12 and Figure 13 In the locking member 59 shown, the positional relationship between the holding position A1 and the releasing position A2 is reversed, and it can be configured such that the releasing position A2 is set at a position substantially in contact with the upper part of the connector 54, and the holding position A1 is set at a position farther away from the connector 54 upward compared to the releasing position A2.

[0160] According to the foregoing configuration, when the restricting member 60 is installed at the restricting position B1, the restricting member 60 is configured to be located between the connector 54 and the locking member 59 operated to the holding position A1.

[0161] Thus, even if the locking member 59 moves from the holding position A1 toward the releasing position A2 in a manner approaching the connector 54, the movement of the locking member 59 is blocked by the contact between the locking member 59 and the restricting member 60, and the locking member 59 cannot move to the releasing position A2.

[0162] (The Ninth Other Mode of Implementing the Invention)

[0163] It is possible to set Figure 12 and Figure 13 the locking member 59 shown below the connector 54.

[0164] It is possible to set the locking member 59 of (the Sixth Other Mode of Implementing the Invention)-(the Eighth Other Mode of Implementing the Invention) below the connector 54.

[0165] With this configuration, as in (the Sixth Other Mode of Implementing the Invention) and Figure 14 shown, it is possible to set the restricting member 60 below the connector 54 and the locking member 59.

[0166] (The Tenth Other Mode of Implementing the Invention)

[0167] It is possible to set Figure 12 and Figure 13 the locking member 59 shown on the motor 15. It is possible to set the locking member 59 of (the Sixth Other Mode of Implementing the Invention)-(the Ninth Other Mode of Implementing the Invention) on the motor 15.

[0168] With this configuration, when the connector 54 is detached from the terminal 15a of the motor 15, the locking member 59 remains on the motor 15.

[0169] (The Eleventh Other Mode of Implementing the Invention)

[0170] It can be configured to slide-operate horizontally or vertically across the holding position A1 and the releasing position A2Figure 12 and Figure 13 the locking member 59 shown. The locking member 59 can also be configured to slide horizontally or vertically across the holding position A1 and the release position A2 (Sixth other mode of implementing the invention)-(Tenth other mode of implementing the invention).

[0171] (Twelfth other mode of implementing the invention)

[0172] It is also possible to Figure 12 and Figure 13 apply the configuration of the locking member 59 shown to the locking member 59 of the connector 53 connected to the terminal 14a of the converter 14 (see Figure 5 ). It is also possible to apply the configuration of the locking member 59 of (Sixth other mode of implementing the invention)-(Eleventh other mode of implementing the invention) to the locking member 59 of the connector 53 connected to the terminal 14a of the converter 14 (see Figure 5 ).

[0173] (Thirteenth other mode of implementing the invention)

[0174] As the traveling device, a crawler traveling device (not shown) can be provided instead of the rear wheels 2.

[0175] As the traveling device, a crawler traveling device (not shown) can be provided instead of the front wheels 1 and the rear wheels 2.

[0176] Industrial applicability

[0177] The present invention can be applied not only to tractors but also to other electric work vehicles such as electric carts and forklifts.

[0178] Explanation of reference numerals

[0179] 1, Front wheel (traveling device)

[0180] 2, Rear wheel (traveling device)

[0181] 5, Driver's cab

[0182] 8, Floor part

[0183] 8a, Right front part

[0184] 8b, Left front part

[0185] 10, Main frame

[0186] 13, Battery

[0187] 14, Converter

[0188] 15, Motor

[0189] 34, Support frame

[0190] 35. Front and rear frames (base)

[0191] 35a. Opening

[0192] 36. Front and rear frames (base)

[0193] 37. Left and right frames (base)

[0194] 38. Left and right frames (base)

[0195] 39. Left and right frames (base)

[0196] 45. Upright part

[0197] 46. Upright part

[0198] 47. Connecting part

[0199] 49. Floor frame

Claims

1. An electric working vehicle, characterized in that, Comprising: Traveling device; Main frame that supports the traveling device; Battery; Support frame that is mounted on the main frame and supports the battery on the main frame by placing the battery thereon; Motor that operates using the power from the battery and drives the traveling device, The motor is suspended and supported by the support frame.

2. The electric working vehicle according to claim 1, characterized in that, A connecting portion that protrudes downward and is connected to the motor is provided on the support frame, An opening portion that exposes the connecting portion upward is provided in a portion above the connecting portion on the support frame.

3. The electric working vehicle according to claim 2, characterized in that, A plurality of front - rear frames and a plurality of left - right frames are provided on the support frame. The front - rear frames extend in the front - rear direction and are arranged at intervals in the left - right direction. The left - right frames extend in the left - right direction and are arranged at intervals in the front - rear direction, The opening portion is provided in any one of the plurality of front - rear frames and the plurality of left - right frames.

4. The electric working vehicle according to any one of claims 1 to 3, characterized in that, The upper part of the motor is connected to the support frame, and the front part or the rear part of the motor is connected to the main frame.

5. The electric working vehicle according to any one of claims 1 to 4, characterized in that, A base portion on which the battery is placed and a standing portion that stands up from the base portion and surrounds the lower outer periphery of the battery are provided on the support frame, The converter that supplies the power from the battery to the motor is provided near the side of the motor on the lower side with respect to the support frame, The portion of the support frame adjacent to the converter is configured in a shape that allows the converter to move along the horizontal direction.

6. The electric working vehicle according to claim 5, characterized in that, The portion of the support frame adjacent to the converter is configured in a shape that is recessed upward.

7. The electric working vehicle according to claim 5 or 6, characterized in that, The portion of the support frame adjacent to the converter is the portion of the support frame on the opposite side of the motor with respect to the converter.

8. The electric working vehicle according to any one of claims 1 to 7, characterized in that, The driver's cab is mounted on the rear side with respect to the support frame, The right front part and the left front part of the floor portion of the driver's cab extend forward to positions adjacent to the right rear part and the left rear part of the support frame, Left - right floor frames capable of supporting the right front part and the left front part of the floor portion are provided, The left - right floor frames can be loaded and unloaded with respect to the right rear part and the left rear part of the support frame.

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