Electric work vehicle

Abstract

An electric work vehicle is provided with: a wire harness (52) that supplies power from a battery to a motor (15); and a connector (54) that is provided at an end of the wire harness (52) and that is connected to the motor (15). The connector (54) is provided with: a lock member (59) that can be manually operated within the range of a holding position (A1) for holding the connection between the connector (54) and the motor (15) and a release position (A2) for allowing the connector (54) to be separated from the motor (15); the present invention is provided with a detachable restricting member (60) for preventing operation of a lock member (59) from a holding position (A1) to a release position (A2) by means of an operation path of the lock member (59) provided across the holding position (A1) and the release position (A2).

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 for driving a traveling device is supported by the main frame so as to be disposed below the battery.

[0003] In Patent Document 1, a hood covering the battery is provided. The following state is formed: when viewed from the side, the electric motor is disposed at a position lower than the lower end portion of the hood, and the electric motor is disposed outside the hood.

[0004] Regarding electric work vehicles, in a wiring harness supplied with electric power from a battery, a locking member is sometimes provided for a connector of the wiring harness.

[0005] After connecting the connector of the wiring harness to the electric motor, by operating the locking member to the holding position, the connector of the wiring harness does not come off from the electric motor. By operating the locking member to the release position, the connector of the wiring harness can be detached from the electric motor.

[0006] Prior Art Documents

[0007] Patent Documents

[0008] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2021-957 (JP2021957A). Summary of the Invention

[0009] Technical Problem to be Solved by the Invention

[0010] In the electric work vehicle of Patent Document 1, when driving over an uneven road surface, branches of plants or the like sometimes come into contact with the area near the electric motor. If branches of plants or the like come into contact with the locking member, there is a possibility that the locking member is operated from the holding position to the release position. Also, due to vibrations during traveling, there is a possibility that the locking member gradually moves from the holding position to the release position.

[0011] An object of the present invention is to prevent a locking member from being operated to the release position in an electric work vehicle when a locking member is provided for a connector of a wiring harness connected to an electric motor.

[0012] Technical Solution for Solving the Technical Problem

[0013] The electric work vehicle of the present invention includes a hood that houses a battery; a motor that is disposed outside the hood; a traveling device that is driven by the motor; a wiring harness that supplies power from the battery to the motor; a connector that is disposed at an end of the wiring harness and is connected to the motor; a locking member that can be manually operated within a range between a holding position for holding the connection between the connector and the motor and a release position for allowing the separation of the connector from the motor; and a restricting member that is disposed across an operation path of the locking member between the holding position and the release position to prevent the locking member from being operated from the holding position to the release position, and the restricting member is detachable.

[0014] According to the present invention, after an operator connects the connector of the wiring harness to the motor and operates the locking member to the holding position, the operator can set the restricting member on the operation path of the locking member.

[0015] Thereby, even if an attempt is made to move the locking member from the holding position to the release position, since the locking member abuts against the restricting member, the movement of the locking member is blocked, and the locking member cannot move to the release position.

[0016] According to the present invention, it is possible to prevent the locking member from being operated from the holding position to the release position due to contact between the branches of plants or the like and the locking member during traveling, to prevent the locking member from gradually moving from the holding position to the release position due to vibration during traveling, and to prevent the connector of the wiring harness from coming off the motor.

[0017] According to the present invention, when the connector of the wiring harness is detached from the motor for maintenance work or the like, the operator can operate the locking member from the holding position to the release position by detaching the restricting member. Thereby, the operator can easily detach the connector of the wiring harness from the motor and perform maintenance work or the like without any obstacles.

[0018] In the present invention, preferably, a fixing member for mounting the restricting member is provided, and the restricting member can be detached by detaching the fixing member using a tool.

[0019] According to the present invention, since the restricting member is mounted using the fixing member, the mounting of the restricting member becomes firm.

[0020] When the connector of the wiring harness is detached from the motor for maintenance work or the like, the operator can detach the restricting member by using a tool to detach the fixing member, and can perform maintenance work or the like without any obstacles.

[0021] In the present invention, preferably, the release position is set at a position farther from the connector than the holding position.

[0022] According to the present invention, in the locking member, the release position is set at a position farther from the connector of the wire harness than the holding position. When the locking member is operated to the release position, it becomes a state of extending outward from the connector of the wire harness. Therefore, it is easy for an operator to notice that the locking member is operated to the release position.

[0023] It is easy for an operator to notice that the locking member is operated to the release position. Therefore, the operator can install the restricting member without forgetting.

[0024] In the locking member, the release position is set at a position farther from the connector of the wire harness than the holding position. In other words, the holding position is set at a position closer to the connector of the wire harness.

[0025] Thus, according to the present invention, the restricting member can also be set at a position close to the connector of the wire harness. Therefore, the connector of the wire harness, the locking member operated to the holding position, and the restricting member are compactly arranged.

[0026] The locking member operated to the holding position is arranged at a position close to the connector of the wire harness. Thus, the locking member operated to the holding position does not extend outward from the connector of the wire harness. The possibility of contact between the branches of plants and the locking member during driving becomes small. Therefore, it is advantageous in preventing the locking member from being operated from the holding position to the release position.

[0027] In the present invention, preferably, the restricting member is provided across the entire width of the locking member operated to the holding position.

[0028] According to the present invention, the restricting member is provided across the entire width of the locking member operated to the holding position. Therefore, when it is desired to move the locking member from the holding position to the release position, the restricting member abuts against the locking member over a relatively wide range of the locking member. The restricting member can stably prevent the movement of the locking member to the release position. Thus, it is advantageous in preventing the locking member from being operated from the holding position to the release position.

[0029] In the present invention, preferably, the restricting member is provided with a first part and a pair of second parts. The first part extends in the horizontal direction. The pair of second parts extend in the same direction in the vertical direction from one end and the other end of the first part. The first part is arranged above or below the connector, and the second part is arranged laterally outside the connector.

[0030] According to the present invention, a state is formed in which the restricting member surrounds the connector of the wire harness and the locking member. The restricting member can stably prevent the movement of the locking member to the release position. Therefore, it is advantageous in preventing the locking member from being operated from the holding position to the release position.

[0031] In the present invention, preferably, the cover covering the wire harness and the connector is disposed below the wire harness and the connector, the locking member is disposed above the connector, the first portion is disposed above the connector, and the lower portion of the second portion is mounted on the cover.

[0032] According to the present invention, the lower portion of the wire harness and the connector is covered by the cover, which can prevent the wire harness and the connector from being collided by splashed small stones or the like.

[0033] According to the present invention, the locking member is disposed above the connector of the wire harness. In the restricting member having the first portion and the second portion as described above, the first portion of the restricting member is disposed above the connector of the wire harness, and the lower portion of the second portion of the restricting member is mounted on the cover.

[0034] By effectively using the cover covering the lower portion of the wire harness and the connector to mount the restricting member, the cover has the protection function of the wire harness and the connector and the supporting function of the restricting member. Therefore, the simplification of the structure can be achieved through the dual use of functions.

[0035] In the present invention, preferably, an opening for cleaning and inspection is provided in the cover, and a cover portion for closing the opening by being mounted on the cover is provided, and the cover portion can be detached from the cover.

[0036] According to the present invention, by detaching the cover portion, the wire harness and the connector can be seen and inspected through the opening of the cover. Even if soil or the like accumulates on the cover, by detaching the cover portion, the soil or the like accumulated on the cover can be taken out through the opening of the cover.

[0037] In the present invention, preferably, left and right main frames are provided along the front-rear direction, and the connector and the locking member are disposed between the left and right main frames so as to overlap the left and right main frames in a side view, and the restricting member is mounted across the left and right main frames.

[0038] According to the present invention, when the wire harness and the connector are disposed between the right and left main frames, since the restricting member is mounted across the right and left main frames, the main frame has the supporting function of the restricting member, and the simplification of the structure can be achieved through the dual use of functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 is a left side view of a tractor.

[0040] Figure 2 is a top view of a tractor.

[0041] Figure 3 is a schematic diagram showing a transmission system from a motor to front wheels and rear wheels.

[0042] Figure 4 It is a left side view of the interior of the engine hood.

[0043] Figure 5 It is a left side view near the converter and the motor.

[0044] Figure 6 It is a longitudinal sectional front view near the support frame and the converter.

[0045] Figure 7 It is a longitudinal sectional front view near the motor.

[0046] Figure 8 It is an exploded perspective view of the support frame and the motor.

[0047] Figure 9 It is a top view of the support frame.

[0048] Figure 10 It is a left side view of the support frame.

[0049] Figure 11 It is a front view of the support frame.

[0050] Figure 12 It is a top view near the terminals, connectors, and restricting members of the motor.

[0051] Figure 13 It is a longitudinal sectional left side view near the terminals, connectors, and restricting members of the motor.

[0052] Figure 14 It is a longitudinal sectional left side view near the terminals, connectors, and restricting members of the motor in the sixth different embodiment of the present invention. Detailed Description of the Invention

[0053] In Figures 1-14 , a tractor is shown as an example of an electric work vehicle. In Figures 1-14 , F represents the front direction, B represents the rear direction, U represents the upward direction, D represents the downward direction, R represents the right direction, and L represents the left direction.

[0054] (Overall Structure of the Tractor)

[0055] 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). An engine 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.

[0056] The body 3 has a right and a left main frame 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 frame 10, and the rear wheels 2 are supported by the transmission case 12.

[0057] With the above configuration, the front wheels 1 (traveling devices) and the rear wheels 2 (traveling devices), and the main frame 10 that supports the front wheels 1 (traveling devices) are installed on the tractor.

[0058] (Configuration of the front part of the body)

[0059] As Figure 1 shown, the battery 13, the converter 14, and the motor 15 are supported by the main frame 10.

[0060] As Figure 4 shown, a connection part 16 is provided at the left front part of the battery 13, a charger (not shown) of an external power source (not shown) is connected to the connection part 16, and the power of the external power source is charged from the connection part 16 to the battery 13. The power of the battery 13 is supplied to the converter 14. In the converter 14, the direct current of the battery 13 is converted into alternating current and supplied to the motor 15. In this way, the motor 15 is driven.

[0061] As Figure 2 and Figure 4 shown, a DC-DC converter 17, a battery 18, a radiator 19, a water pump 20, etc. are provided at the front part of the main frame 10. The battery 13, the converter 14, the connection part 16, the DC-DC converter 17, the battery 18, the radiator 19, etc. are covered with the engine hood 4.

[0062] With the above configuration, the battery 13 and the engine hood that houses the battery 13 are installed on the tractor.

[0063] 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.

[0064] 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 via the pipeline 23 from the DC-DC converter 17.

[0065] (Configuration of the drive system for the front and rear wheels)

[0066] 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 drive shaft 25. The continuously variable transmission 24 can perform continuously variable transmission in the forward and reverse directions, and is operated by a speed change pedal 26 provided on the floor portion 8 ( Figure 2 refer to).

[0067] The sub-transmission 27, the rear wheel differential device 28, the front wheel transmission device 29, and the 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 is transmitted from the sub-transmission 27 to the rear wheels 2 via the rear wheel differential device 28.

[0068] The power branched between the sub-transmission 27 and the rear wheel differential device 28 is transmitted to the front wheel transmission device 29, is transmitted from the front wheel transmission device 29 to the front wheel differential device 32 via the drive shaft 31, and is transmitted from the front wheel differential device 32 to the front wheels 1.

[0069] When the front wheels 1 are operated within the range of the set angles on the right and left from the straight-ahead position, the front wheels 1 and the rear wheels 2 are driven at the same speed by the front wheel transmission device 29. When the front wheels 1 are turned to the right or left beyond the set angles on the right and left, the front wheels 1 are driven at a speed higher than that of the rear wheels 2 by the front wheel transmission device 29.

[0070] With the above configuration, the motor 15 that operates using the electric power from the battery 13 and drives the front wheels 1 (traveling devices) and the rear wheels 2 (traveling devices) is provided, and the front wheels 1 (traveling devices) and the rear wheels 2 (traveling devices) driven by the motor 15 are mounted on the tractor.

[0071] A right brake 30 is provided in the drive system from the rear wheel differential device 28 to the right rear wheel 2, and a left brake 30 is provided in the drive system from the rear wheel differential device 28 to the left rear wheel 2. A right brake pedal 33 capable of operating the right brake 30 and a left brake pedal 33 capable of operating the left brake 30 are provided at the left front portion 8b of the floor portion 8 (refer to Figure 2 ). When turning 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 turn can be made.

[0072] (Configuration of the support frame for the battery)

[0073] As Figures 4-7As shown, the support frame 34 is mounted on the main frame 10, and the battery 13 is placed on and connected to the support frame 34.

[0074] 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 foot portions 40, right and left connecting plates 41, right and left brackets 42, upright portions 45, 46, etc.

[0075] The front and rear frames 35, 36 are angle-shaped members along the front-rear direction. The left and right frame 37 is a flat plate-shaped member along the left-right direction. The left and right frames 38, 39 are angle-shaped members along the left-right direction. The front frame 35 and the right front frame 36 are arranged at intervals in the left-right direction. And, 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, 38, and 39 are arranged at intervals in the front-rear direction. The front and rear frames 35, 36 and the left and right frames 37, 38, 39 are connected. With the above structure, the support frame 34 (the front and rear frames 35, 36 and the left and right frames 37, 38, 39) is configured in a lattice shape when viewed from above.

[0076] The two channel-shaped foot portions 40 are connected to the front part of the right front frame 36. The connecting plate 41 along the front-rear direction straddles and connects to the lower part of the two foot portions 40. The two channel-shaped foot portions 40 are connected to the front part of the left front frame 36. The connecting plate 41 along the front-rear direction straddles and connects to the lower part of the two foot portions 40. The right bracket 42 is connected to the rear part of the right front frame 36, and the left bracket 42 is connected to the rear part of the left front frame 36.

[0077] The flat upright portion 45 is bolted to the left and right frames 37 and stands up upward from the left and right frames 37. The flat right upright portion 46 is bolted to the right front frame 36. And, the flat 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.

[0078] (Support structure of the support frame on the main frame)

[0079] As Figures 4-7 shown, the right flat support member 43 is connected along the front-rear direction to the upper front part of the right main frame 10. And, the left flat support member 43 is connected along 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 along the front-rear direction.

[0080] The right foot portion 40 of the support frame 34 and the connecting plate 41 are bolted to the right support member 43, and the left foot portion 40 of the support frame 34 and the connecting plate 41 are bolted to the left support member 43. The right bracket 42 of the support frame 34 is bolted to the right portion of the gear case 44, and the left bracket 42 of the support frame 34 is bolted to the left portion of the gear case 44.

[0081] As described above, the support frame 34 is mounted on the main frame 10, and the front and rear frames 36 of the support frame 34 are located at a position slightly above and away from the upper end of the main frame 10.

[0082] (Support state of the battery on the support frame)

[0083] As Figures 4-7 shown, by placing the battery 13 on the front and rear frames 35, 36 and the left and right frames 37, 38, 39 of the support frame 34, 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.

[0084] The front part of the lower part of the battery 13 is bolted to the upright portion 45, the lower right and lower left parts of the battery 13 are bolted to the upright portion 46, and the lower rear part of the battery 13 is bolted to the left and right frames 39, thereby connecting the battery 13 to the support frame 34.

[0085] According to the above configuration, there is provided a support frame 34 which is mounted on the main frame 10 and supports the battery 13 by placing the battery 13.

[0086] 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.

[0087] On the support frame 34, there are provided front and rear frames 35, 36 (base portions) on which the battery is placed and 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.

[0088] (Support structure of the motor)

[0089] 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 frames 39).

[0090] The connecting part 47 is formed by bending a plate material into a channel shape, and is connected to the lower surface part 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.

[0091] The connecting bolt 48 is inserted into the opening of the connecting part 47, and openings 35a are formed in the upper part of the connecting part 47 on the front and rear frames 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 frames 35, and perform the tightening operation and disassembly operation of the connecting bolt 8 with the tool such as a wrench.

[0092] As Figure 4 , 5 , as shown in FIGS. 7-10, the motor 15 is disposed on the lower side with respect to the rear part (between the left and right frames 38 and 39) 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 part 47 by the connecting bolt 48, and the rear part of the motor 15 is bolt-connected to the gear case 44.

[0093] With the above configuration, the connecting part 47 that protrudes downward and connects the motor 15 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 part 47 upward is provided in the upper part of the connecting part 47 on the support frame 34, and the opening 35a is provided in the front and rear frames 35 of the support frame 34.

[0094] The upper part of the motor 15 is connected to the support frame 34 (connecting part 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.

[0095] In a side view (refer to Figure 1 and Figure 4 ), the motor 15 is located at a position lower than the lower end of the machine cover 4 and the support frame 34 (front and rear frames 36), and the motor 15 can be seen from the gap between the lower end of the machine cover 4 and the support frame 34 (front and rear frames 36) and the upper end of the main frame 10.

[0096] With the above configuration, the motor 15 provided outside the machine cover 4 is provided.

[0097] (Support structure of the converter)

[0098] As Figure 4 , 5, as shown in FIGS. 6, the converter 14 is bolted to the right and left support members 43, supported by the main frame 10, disposed at a position adjacent to the motor 15 in the front-rear direction, and disposed below the front portion (between the left and right frames 37, 38) of the support frame 34.

[0099] As Figure 8 and Figure 11 shown, the lower portion 45a of the upright portion 45 (corresponding to the portion adjacent to the converter 14 on the support frame 34) is configured to be recessed upward, and in a front view, the upright portion 45 is formed in a gate shape.

[0100] As Figure 6 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 portion 45a of the upright portion 45.

[0101] In a state where the DC-DC converter 17, the battery 18, the radiator 19, etc. are removed, the operator releases the bolt connection between the converter 14 and the support member 43, moves the converter 14 forward in the horizontal direction, and passes through the lower area with respect to the lower portion 45a of the upright portion 45, thereby removing the converter 14 from the main frame 10.

[0102] 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, passes through the lower area with respect to the lower portion 45a of the upright portion 45, and thereby can place the converter 14 on the support member 43 and perform bolt connection.

[0103] With the above configuration, the converter 14 that supplies power from the battery 13 to the motor 15 is disposed below and laterally near the motor 15 with respect to the support frame 34.

[0104] The portion (upright portion 45) of the support frame 34 adjacent to the converter 14 is configured to be recessed upward and is configured to allow the converter 14 to move along the horizontal direction.

[0105] 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.

[0106] (Support structure of the floor portion on the support frame)

[0107] As Figure 1 and Figure 2As shown, the driver's cab 5 and the floor portion 8 of the driver's cab 5 are disposed at the rear side 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.

[0108] 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.

[0109] The substrate portions 49a of the right and left floor frames 49 are connected to the right rear portion and the left rear portion of the support frame 34 (front and rear frame 36) by bolts 50. As Figure 7 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 vibration isolators 51. By removing the bolts 50, the floor frame 49 can be removed from the support frame 34 (front and rear frame 36).

[0110] With the above configuration, the 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 are provided, and the right and left floor frames 49 are detachable from the right rear portion and the left rear portion of the support frame 34.

[0111] (Structure related to the wiring harness connecting the converter and the motor)

[0112] As Figure 4 and Figure 5 shown, a wiring harness 52 is provided on the tractor. A connector 53 is provided at the front end portion of the wiring harness 52, and the connector 53 is connected to a 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 a terminal 15a at the front portion of the motor 15.

[0113] 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 disposed between the right and left main frames 10 so as to overlap the right and left main frames 10 in side view. A flat cover 55 straddles and is connected to the lower portion of the right and left main frames 10, and is disposed across the front end portion of the main frame 10 and the position below the terminal 15a of the motor 15.

[0114] 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 cover 55. The drive shaft 31 (refer to Figure 3 ) extends forward along the lower space with respect to the cover 55 and is connected to the front wheel differential device 32 housed in the front axle housing 56 ( Figure 3is connected to (reference). The aforementioned water pump 20 is installed on the upper surface portion at the front of the cover 55.

[0115] As Figure 5 and Figure 7 shown, an opening 55a for cleaning and inspection is provided in a portion of the cover 55 between the motor 15 and the front axle housing 56 (the portion between the connectors 53 and 54). A flat cover portion 57 is provided, and the cover portion 57 is installed on the cover 55 by bolts 58, thereby closing the opening 55a of the cover 55 with the cover portion 57. By removing the bolts 58, the cover portion 57 can be removed from the cover 55 to open the opening 55a of the cover 55.

[0116] 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, a wire harness 52 for supplying 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.

[0117] The cover 55 covering the wire harness 52, the connectors 53 and 54, the terminals 14a of the converter 14, and the terminals 15a of the motor 15 is provided on the lower side with respect to the wire harness 52 and the connectors 53 and 54.

[0118] An opening 55a for cleaning and inspection is provided in the cover 55. A cover portion 57 that closes the opening 55a by being installed on the cover 55 is provided, and the cover portion 57 can be removed from the cover 55.

[0119] (Configuration related to the locking member of the wire harness connector)

[0120] As Figure 12 and Figure 13 shown, a locking member 59 is provided on the connector 54 and is provided on the upper side with respect to the connector 54. As Figure 5 and Figure 7 shown, an operator can observe from a position obliquely downward from the upper positions on the right and left lateral sides of the body 3, and thus can see the connector 54 and the locking member 59 through the gap between the lower end portion of the engine hood 4 and the upper end portion of the main frame 10.

[0121] 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.

[0122] 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 forward from the motor 15 compared to the release position A2. The release position A2 is set at a position farther upward from the connector 54 compared to the holding position A1, and is set at a position closer to the motor 15 compared to the holding position A1.

[0123] When the operator connects 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.

[0124] When the operator disconnects 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 disconnected.

[0125] 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.

[0126] With the above configuration, there is provided a locking member 59 that can be manually operated within a range including the holding position A1 for maintaining the connection between the connector 54 and the motor 15 and the release position A2 for allowing the separation of the connector 54 from the motor 15.

[0127] The locking member 59 is disposed 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 compared to the holding position A1.

[0128] (Structure related to the restricting member for the connector connected to the terminal of the motor)

[0129] As Figure 7 、 12 、13 shown, 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.

[0130] Figure 7 、 12The state shown in Fig. 13 is a state in which the lower part of the second portion 60b of the restricting member 60 is attached to the cover 55 by bolts 61 (equivalent to fixing members), and is a state in which the restricting member 60 is attached to the restricting position B1.

[0131] In the state where the restricting member 60 is attached to the restricting position B1, the cover 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.

[0132] In the state where the restricting member 60 is attached to the restricting position B1, the first portion 60a of the restricting member 60 is disposed on the upper side in the left - right direction with respect to the connector 54 and the locking member 59 operated to the holding position A1, 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 outer sides in the up - down direction with respect to the connector 54 and the locking member 59 operated to the holding position A1.

[0133] In the state where the restricting member 60 is attached to 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 (the first portion 60a), and the locking member 59 cannot move to the release position A2.

[0134] The operator removes the bolts 61 using a tool such as a wrench (not shown), and detaches the restricting member 60 from the cover 55 (restricting position B1). By detaching 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 detach the connector 54 from the terminal 15a of the motor 15.

[0135] With the above configuration, there is provided a restricting member 60. By providing 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 is blocked, and the restricting member 60 can be detached. The restricting member 60 is disposed across the entire width of the locking member 59 operated to the holding position A1. There are provided bolts 61 (fixing members) for attaching the restricting member 60, and by removing the bolts 61 (fixing members) using a tool, the restricting member 60 can be detached.

[0136] 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 vertical 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 portions 60b are disposed laterally outside the connector 54. The lower portions of the second portions 60b are mounted on the cover 55.

[0137] (The first other mode of the specific embodiment)

[0138] On the support frame 34, the connecting portion 47 can be provided on the front and rear frames 36, and the opening portion 35a can be provided above the connecting portion 47 on the front and rear frames 36 of the support frame 34. A plurality of connecting portions 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 portion 35a can be provided above the connecting portion 47 on the front and rear frames 35, 36 and the left and right frames 37, 38, 39.

[0139] With the above configuration, the opening portion 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.

[0140] (The second other mode of the specific embodiment)

[0141] The connecting portion 47 can also be abolished.

[0142] In this configuration, the motor 15 can be directly connected to the support frame 34 (front and rear frames 35, 36 and left and right frames 37, 38, 39) by the connecting bolts 48. The motor 15 can be suspended and supported on the support frame 34 (front and rear frames 35, 36 and left and right frames 37, 38, 39) by a suspension member (not shown).

[0143] (The third other mode of the specific embodiment)

[0144] It can be configured that the gear case 44 connected to the right and left main frames 10 is disposed in front of the motor 15, the upper part of the motor 15 is connected to the connecting portion 47, and the front part of the motor 15 is connected to the main frame 10 via the gear case 44.

[0145] It can be configured that the positional relationship between the converter 14 and the motor 15 is swapped, the motor 15 is disposed below the front part of the support frame 34, and the converter 14 is disposed below the rear part of the support frame 34.

[0146] (The fourth other mode of the specific embodiment)

[0147] On the support frame 34, the upright portions 45, 46 can be abolished.

[0148] According to this configuration, the battery 13 is placed on the support frame 34, and the battery 13 can be bolted to the front and rear frames 35, 36 and the left and right frames 37, 38, 39 of the support frame 34.

[0149] (The fifth other mode of the specific implementation manner)

[0150] On the support frame 34, the lower part of the upright portion 46 and the lower part of the front and rear frames 36 can be configured to be recessed upward.

[0151] According to this configuration, the part 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.

[0152] By not disassembling the DC-DC converter 17, the battery 18, the radiator 19, etc., but disassembling the right or left foot portion 40 of the support frame 34 and the connecting plate 41, the converter 14 is moved horizontally to the right or left, and by passing through the lower area with respect to the lower part of the upright portion 46 and the lower part of the front and rear frames 36, the converter 14 is thus disassembled from the main frame 10.

[0153] (The sixth other mode of the specific implementation manner)

[0154] As Figure 14 shown, the restricting member 60 can be formed into a linear rod shape.

[0155] 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 with bolts 61, the restricting member 60 is thus mounted at the restricting position B1.

[0156] With the above configuration, the wiring harness 52, 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 side view, and the restricting member 60 is mounted across the right and left main frames 10.

[0157] (The seventh other mode of the specific implementation manner)

[0158] In Figure 7 、 12 、the restricting member 60 shown in 13, the restricting member 60 of (the sixth other mode of the specific implementation manner), without completely disassembling the restricting member 60 from the cover 55 (main frame 10), it can be configured as follows.

[0159] Maintain the state where one end (a second part 60b) of the restricting member 60 is disassembled and the other end (the other second part 60b) of the restricting member 60 is installed on the cover 55 (main frame 10). Moreover, by changing the form of the restricting member 60, the locking member 59 can be operated from the holding position A1 to the releasing position A2. In other words, the restricting member 60 can be extended out of the operation path of the locking member 59.

[0160] According to this configuration, the form of the restricting member 60 is changed from the restricting position B1, and thus the restricting member 60 is in a state of being disassembled from the restricting position B1. Since the other end (the other second part 60b) of the restricting member 60 remains in the state of being installed on the cover 55 (main frame 10), the restricting member 60 will not be lost.

[0161] (Eighth other mode of the specific implementation manner)

[0162] In Figure 12 and Figure 13 In the locking member 59 shown, it can be configured to reverse the positional relationship between the holding position A1 and the releasing position A2, and the releasing position A2 is set at a position substantially in contact with the upper part of the connector 54. Compared with the releasing position A2, the holding position A1 is set at a position farther above the connector 54.

[0163] 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.

[0164] Thus, even if the locking member 59 moves from the holding position A1 towards 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.

[0165] (Ninth other mode of the specific implementation manner)

[0166] It is possible to set Figure 12 and Figure 13 the locking member 59 shown below the connector 54.

[0167] It is possible to set the locking member 59 in (the sixth other mode of the specific implementation manner)-(the eighth other mode of the specific implementation manner) below the connector 54.

[0168] With this configuration, as in (the sixth other mode of the specific implementation manner) and Figure 14 shown, the restricting member 60 can be set below the connector 54 and the locking member 59.

[0169] (Tenth Other Mode of the Specific Embodiment)

[0170] The locking member 59 shown in Figure 12 and Figure 13 can be provided on the electric motor 15. The locking member 59 of (the sixth other mode of the specific embodiment)-(the ninth other mode of the specific embodiment) can be provided on the electric motor 15.

[0171] With this configuration, when the connector 54 is detached from the terminal 15a of the electric motor 15, the locking member 59 remains on the electric motor 15.

[0172] (Eleventh Other Mode of the Specific Embodiment)

[0173] It can be configured to slide-operate horizontally or vertically across the holding position A1 and the release position A2 Figure 12 and Figure 13 the locking member 59 shown in. It can also be configured to slide-operate horizontally or vertically across the holding position A1 and the release position A2 the locking member 59 of (the sixth other mode of the specific embodiment)-(the tenth other mode of the specific embodiment).

[0174] (Twelfth Other Mode of the Specific Embodiment)

[0175] The configuration of the locking member 59 shown in Figure 12 and Figure 13 can also be applied to the locking member 59 of the connector 53 connected to the terminal 14a of the converter 14 (see Figure 5 ). The configuration of the locking member 59 of (the sixth other mode of the specific embodiment)-(the eleventh other mode of the specific embodiment) can also be applied to the locking member 59 of the connector 53 connected to the terminal 14a of the converter 14 (see Figure 5 ).

[0176] (Thirteenth Other Mode of the Specific Embodiment)

[0177] As the traveling device, a crawler traveling device (not shown) can be provided instead of the rear wheels 2.

[0178] As the traveling device, a crawler traveling device (not shown) can be provided instead of the front wheels 1 and the rear wheels 2.

[0179] Industrial Applicability

[0180] The present invention can be applied not only to tractors but also to other electric work vehicles such as electric carts and forklifts.

[0181] Explanation of Reference Numerals

[0182] 1. Front wheel (travel device)

[0183] 2. Rear wheel (travel device)

[0184] 4. Hood

[0185] 10. Main frame

[0186] 13. Battery

[0187] 15. Motor

[0188] 52. Wiring harness

[0189] 54. Connector

[0190] 55. Cover

[0191] 55a. Opening

[0192] 57. Cover part

[0193] 59. Locking component

[0194] 60. Limiting component

[0195] 60a. First part

[0196] 60b. Second part

[0197] 61. Bolt (fastening piece)

[0198] A1. Holding position

[0199] A2. Release position.

Claims

1. An electric working vehicle, characterized in that, Comprising: A bonnet that houses a battery; An electric motor disposed outside the bonnet; A traveling device driven by the electric motor; A wiring harness that supplies power from the battery to the electric motor; A connector disposed at an end of the wiring harness and connected to the electric motor; A locking member that can be manually operated within a range between a holding position for holding the connection between the connector and the electric motor and a release position for allowing the separation of the connector from the electric motor; A restricting member that prevents the locking member from being operated from the holding position to the release position by being disposed across an operation path of the locking member that spans the holding position and the release position; The restricting member is detachable.

2. The electric work vehicle according to claim 1, characterized in that: There is a fixing member for mounting the restricting member, The restricting member can be detached by removing the fixing member using a tool.

3. The electric work vehicle according to claim 1 or 2, characterized in that: The release position is set at a position farther from the connector than the holding position.

4. The electric work vehicle according to any one of claims 1 - 3, characterized in that: The restricting member is disposed across the entire width of the locking member operated to the holding position.

5. The electric work vehicle according to any one of claims 1 - 4, characterized in that: The restricting member is provided with a first part and a pair of second parts. The first part extends in the horizontal direction, and the pair of second parts extend in the same direction in the vertical direction from one end and the other end of the first part, The first part is disposed above or below the connector, and the second parts are disposed laterally outside the connector.

6. The electric work vehicle according to claim 5, characterized in that: A cover covering the wiring harness and the connector is disposed below the wiring harness and the connector, The locking member is disposed above the connector, The first part is disposed above the connector, and the lower part of the second part is mounted on the cover.

7. The electric work vehicle according to claim 6, characterized in that: An opening for cleaning and inspection is provided in the cover, There is a cover part that closes the opening by being mounted on the cover, The cover part can be detached from the cover.

8. The electric work vehicle according to any one of claims 1 - 7, characterized in that: There are left and right main frames along the front - rear direction, The connector and the locking member are disposed between the left and right main frames in a manner that overlaps the left and right main frames in a side view, The restricting member is mounted across the left and right main frames.

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