Work vehicle

Abstract

To provide a working vehicle including an electric motor for driving a travel device, a battery room formed by a cover member, and a battery provided in the battery room so as to supply power to the electric motor in a state that a service plug is hardly erroneously operated and in a state the working vehicle is hardly contaminated by mud or the like.SOLUTION: A recessed section 27 and a lid member 28 which can open / close the recessed section 27 are provided on an upper surface section 14a of a battery 14. A service plug 20 is stored in the recessed section 27 and is covered with the lid member 28 from the above.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a work vehicle. [Background technology]

[0002] As shown in Patent Document 1, there is a work vehicle (electric tractor) that includes an electric motor that drives a traveling device, a battery room formed by an openable and closable cover member (bonnet), and a battery that is provided in the battery room and supplies power to the electric motor. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-60665 Summary of the Invention [Problem to be solved by the invention]

[0004] The above-mentioned work vehicle is equipped with a service plug that can cut off the power circuit powered by the battery, but if the service plug is operated incorrectly, the power circuit will be cut off and the traveling device will not be able to operate.

[0005] To provide a work vehicle equipped with a service plug that is difficult to operate by mistake and difficult to be soiled by mud or the like. [Means for solving the problem]

[0006] The work vehicle according to the present invention comprises: a driver's section in which an operator rides;The vehicle is equipped with an electric motor that drives a traveling device, a battery room formed by an openable / closable cover member, a battery that is provided in the battery room and supplies power to the electric motor, and a service plug that can cut off a power supply circuit that uses the battery as a power source, and a recessed portion and a lid member that can open and close the recessed portion are provided on the upper surface of the battery, and the service plug is housed in the recessed portion and is covered from above by the lid member. The cover member is provided in front of the driving section. are.

[0007] With this configuration, the service plug is located in the battery's recess and is covered and hidden by the cover, making it difficult to operate the service plug accidentally.The upper surface of the battery where the recess is located is difficult to reach even if mud or other debris is kicked up by the running gear, making it difficult for the service plug to be soiled by mud or other debris.

[0008] In the present invention, The cover member is preferably supported so that it can swing open and closed up and down, with an opening / closing axis positioned at the rear end of the cover member along the width direction of the vehicle body as a swing fulcrum, and the rear end of the opening of the recess is preferably positioned below the opening / closing axis.

[0009] With this configuration, the distance between the cover member and the opening is narrower when the cover member is opened than when the opening is located further forward in relation to the opening axis. In other words, even when the cover member is open, the narrow distance between the cover member and the lid member makes it difficult for the service plug to be accidentally operated.

[0010] In the present invention, Preferably, the opening is non-circular, and a first peripheral portion of the periphery of the opening, which corresponds to the end of the opening on the rear side of the vehicle body, extends in the vehicle width direction along the opening / closing axis, and a second peripheral portion of the periphery of the opening, which corresponds to the end of the opening on the front side of the vehicle body, extends in the vehicle width direction parallel to the first peripheral portion.

[0011] With this configuration, the opening can be made wider while preventing the gap between the cover member and the opening from becoming too wide when the cover member is opened, compared to when the opening is circular, so that the service plug can be easily operated when it is necessary to cut off the power circuit.

[0012] In the present invention, Preferably, the opening is octagonal.

[0013] According to this configuration, the area of ​​the opening located on the vehicle body front side of the opening / closing axis can be made larger, making it easier to operate the service plug.

[0014] In the present invention, It is preferable that screw members for fastening the cover member to the upper surface portion are provided on both sides of the opening, and that the screw members are provided on the vehicle body front side of the opening / closing axis.

[0015] According to this configuration, the screw member can be operated at a location away from the opening / closing axis toward the front of the vehicle body, i.e., at a location where the cover member is unlikely to interfere with operation, making it easy to operate the screw member.

[0016] In the present invention, It is preferable that a power supply fuse be provided adjacent to the service plug.

[0017] According to this configuration, when performing maintenance work such as checking the fuse, the fuse and the service plug are close to each other, making it easy to operate the service plug and therefore easy to cut off the power circuit.

[0018] In the present invention, The fuse is preferably provided further forward on the vehicle body than the service plug.

[0019] According to this configuration, the fuse can be inspected closer to the front of the vehicle than the service plug, making it easier to perform fuse maintenance work.

[0020] In the present invention, It is preferable that the upper surface portion is provided with a second recessed portion separate from the recessed portion, and a second lid member separate from the lid member that is capable of opening and closing the second recessed portion, and that the fuse is housed in the second recessed portion and covered from above by the second lid member.

[0021] According to this configuration, when the service plug is operated, the fuse remains covered by the second cover member, and the fuse can be avoided from being touched.

[0022] In the present invention, It is preferable that a hexalobular screw be provided to fasten the second cover member to the top surface portion. Another work vehicle according to the present invention comprises: The vehicle is equipped with an electric motor that drives a traveling device, a battery room formed by an openable and closable cover member, a battery provided in the battery room and supplying power to the electric motor, and a service plug that can cut off a power supply circuit powered by the battery, a recessed portion and a lid member that can open and close the recessed portion are provided on the upper surface of the battery, the service plug is housed in the recessed portion and is covered from above by the lid member, the cover member is supported so that it can swing open and close up and down around an opening and closing axis that is located at the rear end of the cover member along the width direction of the vehicle body, and the rear end of the opening of the recessed portion is located below the opening and closing axis.

[0023] According to this configuration, the second cover member is fastened to the top surface portion by a hexalobular screw that is difficult to operate, so the fuse can be made difficult to operate by mistake. Furthermore, with this configuration, the service plug is located in the battery's recess and is covered and hidden by the cover, making it difficult to operate the service plug accidentally.The upper surface of the battery where the recess is located is difficult to reach even if mud or other debris is kicked up by the running gear, making it difficult for the service plug to be soiled or damaged by mud or other debris. In the present invention, Preferably, the opening is non-circular, and a first peripheral portion of the periphery of the opening, which corresponds to the end of the opening on the rear side of the vehicle body, extends in the vehicle width direction along the opening / closing axis, and a second peripheral portion of the periphery of the opening, which corresponds to the end of the opening on the front side of the vehicle body, extends in the vehicle width direction parallel to the first peripheral portion. [Brief explanation of the drawings]

[0024] [Figure 1] FIG. 1 is a side view of an electric tractor. [Figure 2] FIG. 2 is a plan view of the electric tractor. [Figure 3] 1 is a plan view showing a service plug, a fuse, a first recessed portion in an open state, and a second recessed portion in an open state. FIG. [Figure 4] 4 is a plan view showing a first recessed portion in a closed state and a second recessed portion in a closed state. FIG. [Figure 5] FIG. 4 is a cross-sectional view of FIG. 3 . [Figure 6] 6 is a cross-sectional view taken along the line VI-VI in FIG. 3. [Figure 7] FIG. 4 is a perspective view of a second connecting bolt. [Figure 8] FIG. 1 is a perspective view of a hexalobular screw. [Figure 9] FIG. 10 is a plan view showing a first recessed portion of another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0025] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an electric tractor, which is an example of a work vehicle according to the present invention, will be described below with reference to the drawings.

[0026] [Overall structure] An electric tractor is shown in Figures 1 and 2. This electric tractor can be used to configure various types of work equipment, such as a riding cultivator by connecting a rotary tiller (not shown) to the rear of the vehicle body, or a riding brush cutter by connecting a brush cutter (not shown) to the bottom of the vehicle body.

[0027] When defining the front-to-rear direction of the traveling body of an electric tractor, it is defined along the direction of travel of the body in a working state, and when defining the left-to-right direction of the traveling body, it is defined as seen from the direction of travel of the traveling body. That is, the direction indicated by the symbol (F) in Figures 1 and 2 is the front of the body, and the direction indicated by the symbol (B) in Figures 1 and 2 is the rear of the body. The direction indicated by the symbol (L) in Figure 2 is the left side of the body, and the direction indicated by the symbol (R) in Figure 2 is the right side of the body. Therefore, the left-to-right direction of the body corresponds to the width direction of the body. Furthermore, the direction indicated by the symbol (U) in Figure 1 is the top of the body, and the direction indicated by the symbol (D) in Figure 1 is the bottom of the body.

[0028] An electric tractor has a traveling body 3 supported by a pair of steerable and drivable front wheels 1 serving as a left and right traveling device, and a pair of drivable rear wheels 2 serving as a left and right traveling device. A prime mover 5 equipped with an electric motor 4 that drives the front wheels 1 and rear wheels 2 is provided at the front of the traveling body 3. A driver's section 6 in which an operator sits is provided at the rear of the traveling body 3. The driver's section 6 is equipped with a driver's seat 7, a steering wheel 8 that steers the front wheels 1, and a ROPs 9 that serves as a driver protection device. A body frame 10 is composed of a front frame 11a that supports the front wheels 1, etc., and a transmission case 11 whose front section is connected to the rear of the front frame 11a and supports the rear wheels 2, etc.

[0029] [Motor unit] 1, 2, and 6, the driving unit 5 includes a battery room 13 formed by a cover member 12. A battery 14 is provided in the battery room 13. Below the battery 14, there are provided an electric motor 4 that drives the front wheels 1 and the rear wheels 2, and an inverter 15 that converts DC power from the battery 14 into AC power and supplies it to the electric motor 4. The electric motor 4 and the inverter 15 are aligned in the fore-and-aft direction of the vehicle body, with the electric motor 4 located rearward of the inverter 15.

[0030] The electric motor 4 is supported by the front frame 11a. The output of the electric motor 4 is input to a hydrostatic continuously variable transmission 17 (see FIG. 1) provided at the front of the transmission case 11 via a rotary shaft 16 (see FIG. 1) extending from the electric motor 4 toward the rear of the vehicle body, and is then input from the continuously variable transmission 17 to the transmission case 11. The input power is transmitted to a driving transmission (not shown), and then from the driving transmission to the rear wheels 2 and the front wheels 1. Power is transmitted from the driving transmission to the front wheels 1 via a rotary shaft 18 extending from the transmission case 11 toward the front of the vehicle body.

[0031] The battery 14 is mounted on a battery mounting stand 19 (see Figure 1) supported by the front frame 11a. The battery 14 is provided with a service plug 20 (see Figures 3 and 5) and two fuses 21 (see Figures 3 and 5) that can interrupt the power circuit powered by the battery 14. The inverter 15 is supported by the front frame 11a below the battery mounting stand 19.

[0032] As shown in Figures 1 and 2, the cover member 12 has an opening / closing axis P located at the rear end of the vehicle body of the cover member 12 along the vehicle body width direction, and is supported by the support frame 22 in a state in which it can swing up and down to be opened and closed with the opening / closing axis P as a swing fulcrum.

[0033] 3, 5, and 6, the support frame 22 is formed in a gate shape when viewed from the front, surrounding the upper rear end of the battery 14, and is supported by the front frame 11a via support members 23 provided between the middle portion of the support frame 22 and the front frame 11a. Both end portions 22b of the support frame 22 are engaged with the lateral ends of the battery 14 and are supported by the battery 14. A reinforcing member 24 is connected to the inside of the end portion of the cover member 12 on the rear side of the vehicle body. Connecting portions 24a provided at two locations on the left and right of the reinforcing member 24 are rotatably supported via fulcrum shafts 25 by support portions 22a provided at two locations on the left and right of the support frame 22. The axis of the fulcrum shaft 25 corresponds to the opening / closing axis P.

[0034] [Service plug] 1, 5, and 6, the battery 14 has an upper cover portion 14a provided on the upper part of the battery 14. The upper cover portion 14a is configured to cover the electric circuit portion 14b of the battery 14.

[0035] 3, 4, and 5, a first recess 27 having a first opening 26 and a first lid member 28 that opens and closes the first recess 27 by opening and closing the first opening 26 are provided at the rear end of the upper cover part 14a, which serves as the top surface of the battery 14. A box-shaped member 29 that forms the peripheral and bottom walls of the first recess 27 is provided inside the upper cover part 14a. A service plug 20 that can interrupt a power circuit powered by the battery 14 is housed in the first recess 27 and is covered from above by the first lid member 28.

[0036] In this embodiment, the first recess 27 is provided at the end of the upper cover part 14a on the rear side of the vehicle body, but it can also be provided at any part of the upper cover part 14a, such as the end of the upper cover part 14a on the front side of the vehicle body, or the center of the upper cover part 14a in the fore-and-aft direction of the vehicle body.

[0037] As shown in FIG. 4, the first cover member 28 is configured to be attached and detached to the upper cover portion 14a by four first connecting bolts 30 serving as first screw members. Specifically, two of the four first connecting bolts 30 are configured to engage with portions of the upper cover portion 14a on the left side of the first opening 26, thereby tightening and connecting the first cover member 28 to the upper cover portion 14a. The other two of the four first connecting bolts 30 are configured to engage with portions of the upper cover portion 14a on the right side of the first opening 26, thereby tightening and connecting the first cover member 28 to the upper cover portion 14a. The first connecting bolts 30 are engaged with threaded members fixed to the back surface of the upper cover portion 14a. A sealing gasket 31 (see FIG. 5) is interposed between the first cover member 28 and the upper cover portion 14a.

[0038] Service plug 20 is housed in first recess 27 and is covered and hidden by first lid member 28 to prevent accidental operation and to prevent dirt and other debris thrown up by front wheel 1 from adhering to it. Service plug 20 can be removed upward through first opening 26 by removing first lid member 28 and opening first opening 26.

[0039] 3 and 5, the first opening 26 is provided with its rear end 26a positioned below the opening / closing axis P of the cover member 12. Compared to when the first opening 26 is positioned further forward in the vehicle body than the opening / closing axis P, the distance between the cover member 12 and the first opening 26 can be made narrower when the cover member 12 is open. In other words, even when the cover member 12 is open, the distance between the cover member 12 and the first lid member 28 is narrow, making it difficult to operate the service plug 20.

[0040] As shown in Fig. 3, the first opening 26 is formed in an octagonal shape. Of the periphery 32 of the first opening 26, a first periphery portion 32a corresponding to the end 26a of the first opening 26 on the vehicle rear side extends in the vehicle width direction along the opening / closing axis P. Of the periphery 32 of the first opening 26, a second periphery portion 32b corresponding to the end 26b of the first opening 26 on the vehicle front side extends in the vehicle width direction parallel to the first periphery portion 32a. Compared to when the first opening is circular, the first opening 26 can be made wider to facilitate operation of the service plug 20 while keeping the gap between the cover member 12 and the first opening 26 narrow when the cover member 12 is open.

[0041] As shown in Figure 4, the four first connecting bolts 30 are located closer to the front of the vehicle body than the opening / closing axis P of the cover member 12. When opening or closing the first lid member 28, the first connecting bolts 30 can be operated at locations further forward of the opening / closing axis P, i.e., locations where the cover member 12 is less likely to interfere with operation.

[0042] In this embodiment, two first connecting bolts 30 are provided on both sides of the first opening 26, but it is possible to provide three or more first connecting bolts 30 on both sides of the first opening 26. In this embodiment, the first connecting bolts 30 are used, but it is also possible to use a bolt fixed to the upper cover portion 14a and a screw hole member that engages with this bolt and fastens the first lid member 28 to the upper cover portion 14a in place of the first connecting bolts 30.

[0043] 〔fuse〕 3, the two fuses 21 are provided in a portion of the upper cover portion 14a of the battery 14 adjacent to the service plug 20. Because the two fuses 21 and the service plug 20 are close to each other, when performing maintenance work on the two fuses 21, it is easy to operate the service plug 20 and cut off the power circuit.

[0044] Specifically, as shown in FIGS. 3 and 5 , a second recess 33, separate from the first recess 27, is provided in the upper cover portion 14a at a location adjacent to and in front of the first recess 27. The second recess 33 has a second opening 34 separate from the first opening 26. The second recess 33 is opened and closed by opening and closing the second opening 34 with a second cover member 35 separate from the first lid member 28. Two fuses 21 are housed in the second recess 33 and are covered from above by the second lid member 35. The service plug 20 can be operated while the two fuses 21 remain covered by the second lid member 35. The two fuses 21 are housed in the second recess 33 by attaching the two fuses 21 to a fuse support 36 provided in the second recess 33.

[0045] As shown in FIG. 4 , the second cover member 35 is configured to be attached to and detached from the upper cover portion 14a by four second connecting bolts 37 serving as second screw members. Specifically, two of the four second connecting bolts 37 are configured to engage with both lateral portions of the end of the second opening 34 of the upper cover portion 14a on the vehicle body rear side, thereby tightening and connecting the second cover member 35 to the upper cover portion 14a. The other two of the four second connecting bolts 37 are configured to engage with both lateral portions of the end of the second opening 34 of the upper cover portion 14a on the vehicle body front side, thereby tightening and connecting the second cover member 35 to the upper cover portion 14a. The second connecting bolts 37 are engaged with threaded hole members fixed to the back surface of the upper cover portion 14a. A sealing gasket 41 (see FIG. 5) is interposed between the second lid member 35 and the upper cover portion 14a.

[0046] Three of the four second connecting bolts 37, 37a, are connecting bolts with hexagonal heads 38, as shown in Figure 7. The remaining second connecting bolt 37b, of the four second connecting bolts 37, is a hexabular screw with a hexagonal mounting hole 40 in its head 39, as shown in Figure 8. The hexabular screw is used to fasten the end of the second lid member 35 on the front side of the vehicle body, i.e., the end farther from the opening / closing axis P of the cover member 12.

[0047] In this embodiment, four second connecting bolts 37 are provided, but it is possible to provide six or more second connecting bolts 37. In this embodiment, the second connecting bolts 37 are used, but it is also possible to use, in place of the second connecting bolts 37, a threaded shaft fixed to the upper cover portion 14a and a threaded hole member that engages with the threaded shaft and fastens the second lid member 35 to the upper cover portion 14a.

[0048] [Another embodiment] (1) FIG. 9 is a plan view showing a first recess 27 of another embodiment. In the first recess 27 of the another embodiment, the first opening 26 of the first recess 27 is rectangular. Of the periphery 32 of the first opening 26, a first peripheral edge portion 32a corresponding to one side of the first opening 26 on the rear side is located below the opening-closing axis P and along the opening-closing axis P. First connecting bolts 30 that tighten and connect the first lid member 28 are attached to locations of the upper cover portion 14a corresponding to the four corners of the first opening 26. In this embodiment, the first opening 26 is rectangular with four chamfered corners, but it may be unchamfered. The non-circular shape of the first opening 26 is not limited to an octagonal or rectangular shape, and other shapes such as a hexagon can also be used.

[0049] (2) In the above embodiment, an example was shown in which the first recess 27 was provided at the end of the upper cover portion 14a on the rear side of the vehicle body, but the first recess 27 may be provided at any position on the upper cover portion 14a, such as the end of the upper cover portion 14a on the front side of the vehicle body, or the middle portion of the upper cover portion 14a in the fore-and-aft direction of the vehicle body.

[0050] (3) In the above embodiment, the first opening 26 is an octagonal shape, but this is not limiting, and a first opening having a non-circular shape such as a hexagonal shape may also be employed.

[0051] (4) In the above embodiment, an example in which two fuses 21 are provided is shown, but only one fuse or three or more fuses may be provided.

[0052] (5) In the above embodiment, the fuse 21 is provided in front of and adjacent to the service plug 20, but the fuse 21 may be provided to the side of the service plug 20.

[0053] (6) In the above embodiment, the first recess 27 and the second recess 33 are provided separately, and the first cover member 28 and the second cover member 35 are provided separately. However, this is not limiting. For example, the service plug 20 and the fuse 21 may be housed in the same recess. Alternatively, the first recess 27 and the second recess 33 may be provided separately, and the first opening 26 of the first recess 27 and the second opening 34 of the second recess 33 may be opened and closed by the same cover member.

[0054] (7) In the above embodiment, an example in which a hexalobular screw is used is shown, but a configuration in which a hexalobular screw is not used may also be used.

[0055] (8) In the above embodiment, an example was shown in which the front wheels 1 and rear wheels 2 were provided, but a crawler traveling device or a mini crawler may be provided as the traveling device. [Industrial Applicability]

[0056] The present invention can be applied to a work vehicle equipped with an electric motor that drives a traveling device, a battery room formed by an openable and closable cover member, and a battery that is provided in the battery room and supplies power to the electric motor. [Explanation of symbols]

[0057] 1 Front wheels (running gear) 2 Rear wheels (running gear) 4 electric motors 6. Driving section 12 Cover member 13 Battery Room 14 Battery 14a Upper cover part (top surface) 20 Service plug 21. Fuse 26 First opening (opening) 26a End 26b End 27 First Recess (Recess) 28 First cover member (cover member) 30 First connecting bolt (screw member) 32 Periphery 32a First peripheral part 32b Second peripheral part 33 Second Recess 34 Second Opening 35 Second cover member 37b Second connecting bolt (hexalobular screw)

Claims

1. A driving section in which an operator rides, an electric motor that drives the traveling device; a battery room formed by an openable and closable cover member; a battery provided in the battery room and supplying power to the electric motor; a service plug capable of interrupting a power supply circuit powered by the battery, a recessed portion and a cover member that can open and close the recessed portion are provided on an upper surface of the battery; the service plug is accommodated in the recess and is covered from above by the lid member; The cover member is provided in front of the driving section of the work vehicle.

2. The cover member is supported so as to be swingable up and down to be opened and closed, with an opening / closing axis positioned at an end of the cover member on the rear side of the vehicle body along the vehicle body width direction as a swing fulcrum, 2. A work vehicle according to claim 1, wherein the end of the opening of the recess on the rear side of the vehicle body is located below the opening / closing shaft.

3. An electric motor that drives a traveling device; a battery room formed by an openable and closable cover member; a battery provided in the battery room and supplying power to the electric motor; a service plug capable of interrupting a power supply circuit powered by the battery, a recessed portion and a cover member that can open and close the recessed portion are provided on an upper surface of the battery; the service plug is accommodated in the recess and is covered from above by the lid member; The cover member is supported so as to be swingable up and down to be opened and closed, with an opening / closing axis positioned at an end of the cover member on the rear side of the vehicle body along the vehicle body width direction as a swing fulcrum, A work vehicle in which the end of the opening of the recessed portion on the rear side of the vehicle body is located below the opening / closing axis.

4. the opening is non-circular; 4. A work vehicle as described in claim 2 or 3, wherein a first peripheral portion of the periphery of the opening corresponding to the end of the opening on the rear side of the vehicle body extends in the vehicle width direction along the opening / closing axis, and a second peripheral portion of the periphery of the opening corresponding to the end of the opening on the front side of the vehicle body extends in the vehicle width direction parallel to the first peripheral portion.

5. 5. The work vehicle according to claim 4, wherein the opening is octagonal.

6. screw members for fastening the cover member to the top surface portion on both sides of the opening, 4. The work vehicle according to claim 2, wherein the screw member is provided on the vehicle body front side of the opening / closing axis.

7. 4. The work vehicle according to claim 1, wherein a power supply fuse is provided adjacent to the service plug.

8. 8. The work vehicle according to claim 7, wherein the fuse is provided closer to the front of the vehicle body than the service plug.

9. a second recessed portion separate from the recessed portion, and a second cover member separate from the cover member and capable of opening and closing the second recessed portion, provided on the upper surface portion; 8. The work vehicle according to claim 7, wherein the fuse is housed in the second recess and is covered from above by the second cover member.

10. 10. The work vehicle according to claim 9, further comprising a hexalobular screw for fastening the second cover member to the top surface portion.

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