electric work vehicle

Abstract

To provide an electric work vehicle that does not require a space to be secured behind a battery in order to install a support frame that supports a cover member, and that enables the cover member to be stably supported.SOLUTION: An electric work vehicle includes: a battery 4; a motor driven by electric power supplied from the battery 4; a travel device driven by the motor; a cover member 12 covering the battery 4 and configured to be openable and closable; and a support part that supports the cover member 12. The support part includes: first support parts 81 that support the cover member 12; and a second support part 82 arranged so that a gap G can be provided between itself and an upper end surface 4a of the battery 4. The first support parts 81 extend upward from an upper surface of the second support part 82.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to an electric work vehicle that includes a battery, a motor that is driven by power supplied from the battery, and a traveling device that is driven by the motor. [Background technology]

[0002] An example of an electric work vehicle like the one described above is already known, as described in Patent Document 1. This electric work vehicle (referred to as a "tractor" in Patent Document 1) is equipped with a cover member that covers the battery (referred to as a "travel battery" in Patent Document 1). This cover member is configured to be able to be opened and closed by swinging about a horizontal axis (referred to as an "opening and closing axis" in Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-953 Summary of the Invention [Problem to be solved by the invention]

[0004] The support structure for the cover member is not described in detail in Patent Document 1. Here, for example, a configuration is conceivable in which a support frame extending in the vertical direction is provided behind the battery, and the cover member is supported on the upper end of the support frame in a state in which it can swing around a horizontal axis.

[0005] However, this configuration requires a relatively large space behind the battery to provide a support frame strong enough to stably support the cover member, which tends to reduce the size of the battery that can be mounted, and as a result, the battery capacity tends to be small.

[0006] An object of the present invention is to provide an electric work vehicle that does not require space behind the battery to place a support frame that supports a cover member, and in which the cover member is stably supported. [Means for solving the problem]

[0007] The present invention is characterized in that it comprises a battery, a motor driven by power supplied from the battery, a traveling device driven by the motor, a cover member that covers the battery and is configured to be openable and closable, and a support portion that supports the cover member, the support portion having a first support portion that supports the cover member and a second support portion that is arranged so as to provide a gap between the first support portion and an upper end surface of the battery, and the first support portion extends upward from an upper surface of the second support portion. the second support portion includes a lateral support portion extending in a lateral direction, the second support portion is attached to the battery, and is disposed so that a gap is provided between the lateral support portion and an upper end surface of the battery. The reason is that there are

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[0011] Furthermore, in the present invention, it is preferable that the second support portion is configured in a gate shape that straddles an upper end surface of the battery.

[0012]

[0013] Furthermore, in the present invention, it is preferable that a step portion is provided on the side of the battery, and the length of the lower part of the battery in the front-to-back direction is longer than the length of the upper part of the battery in the front-to-back direction, and the length of the lower part of the battery in the left-to-right direction is longer than the length of the upper part of the battery in the left-to-right direction.

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[0023] [Brief explanation of the drawings]

[0024] [Figure 1] FIG. [Figure 2] FIG. 2 is a partially cutaway right side view showing the configuration of the cover member and the like. [Figure 3] FIG. 2 is a partially cutaway front view showing the configuration of a driving battery and the like. [Figure 4] FIG. 3 is a partially cutaway front view showing the configuration of a first support portion and the like. [Figure 5] FIG. 2 is a plan view showing the configuration of a first support portion and the like. [Figure 6] FIG. 10 is an exploded perspective view showing the attachment structure of the second support portion. [Figure 7] FIG. 10 is a partially cutaway front view showing the configuration of a driving battery and other components in another embodiment (2). DETAILED DESCRIPTION OF THE INVENTION

[0025] An embodiment of the present invention will be described with reference to the drawings. In the following description, the direction of arrow F shown in Figures 1, 2, 5, and 6 is defined as "front," the direction of arrow B as "rear," the direction of arrow L shown in Figures 3 to 7 as "left," and the direction of arrow R as "right." Furthermore, the direction of arrow U shown in Figures 1 to 4, 6, and 7 is defined as "up," and the direction of arrow D as "down."

[0026] [Overall configuration of the tractor] As shown in Figure 1, tractor A (corresponding to the "electric work vehicle" according to the present invention) is equipped with left and right front wheels 10 (corresponding to the "traveling device" according to the present invention), left and right rear wheels 11 (corresponding to the "traveling device" according to the present invention), and a cover member 12.

[0027] The tractor A also includes a machine frame 2 and a driving section 3.

[0028] The vehicle frame 2 is supported by left and right front wheels 10 and left and right rear wheels 11.

[0029] The cover member 12 is disposed at the front of the machine body, and the driving section 3 is disposed behind the cover member 12.

[0030] The driver's section 3 has a protective frame 30, a driver's seat 31, and a steering wheel 32. An operator can sit in the driver's seat 31. This allows the operator to get into the driver's section 3. The left and right front wheels 10 are steered by operating the steering wheel 32. The operator can perform various driving operations in the driver's section 3.

[0031] That is, the tractor A is provided with a driving section 3 on which an operator can ride.

[0032] The tractor A also includes a driving battery 4 (corresponding to the "battery" according to the present invention), a motor M, a transmission device T, and a front transmission mechanism FT.

[0033] The cover member 12 is configured to be swingable around an opening / closing axis Q (see FIG. 2) that runs along the left-right direction of the vehicle body. This allows the cover member 12 to be opened and closed. When the cover member 12 is in the closed state, the driving battery 4 is covered by the cover member 12. In other words, the tractor A is equipped with the cover member 12 that covers the driving battery 4. The driving battery 4 supplies power to the motor M.

[0034] The motor M is disposed below the driving battery 4. The motor M is driven by electric power supplied from the driving battery 4. The driving force of the motor M is transmitted to the transmission device T.

[0035] The transmission device T is disposed rearward of the driving battery 4 and rearward of the motor M. The front transmission mechanism FT extends forward from the transmission device T. The transmission device T changes the speed of the driving force received from the motor M and transmits it to the left and right rear wheels 11. The driving force is also transmitted from the transmission device T to the left and right front wheels 10 via the front transmission mechanism FT. As a result, the left and right front wheels 10 and the left and right rear wheels 11 are driven.

[0036] That is, the tractor A is equipped with a driving battery 4 and a motor M that is driven by power supplied from the driving battery 4. The tractor A also has left and right front wheels 10 and left and right rear wheels 11 that are driven by the motor M.

[0037] As shown in Fig. 1, a link mechanism LN is provided at the rear of the tractor A. A work implement (not shown), such as a tiller, can be connected to the link mechanism LN.

[0038] The transmission device T is configured to be able to transmit a portion of the driving force received from the motor M to the working device, thereby driving the working device.

[0039] With the above configuration, the tractor A can perform work using the work implement while traveling on the left and right front wheels 10 and the left and right rear wheels 11.

[0040] As shown in Fig. 1, the tractor A is also provided with a hydraulic pump 60. The hydraulic pump 60 is provided on the right side of the machine body. The hydraulic pump 60 is driven by a driving force from a motor M. The hydraulic pump 60 supplies hydraulic oil to each part of the machine body.

[0041] In addition, left and right side covers 35 are provided at the front of the body of the tractor A. The side covers 35 have a grill 35a that allows air to pass through. The lower part of the left rear part and the lower part of the right rear part of the cover member 12 are cut out along the outer shape of the side covers 35.

[0042] [Configuration of the front of the aircraft] 2, the tractor A includes a reserve tank 5, an inverter 14, a radiator 15, an auxiliary battery 18, and a voltage converter 19. When the cover member 12 is in a closed state, the reserve tank 5, the radiator 15, the auxiliary battery 18, and the voltage converter 19 are covered by the cover member 12.

[0043] The inverter 14 is disposed below the driving battery 4. The inverter 14 converts DC power from the driving battery 4 into AC power and supplies it to the motor M.

[0044] The reserve tank 5 can store cooling water.

[0045] The radiator 15 and a water pump (not shown) are included in the cooling water path of the tractor A. The water pump pumps the cooling water, causing the cooling water to circulate through this cooling water path. The cooling water is cooled as it passes through the radiator 15.

[0046] The auxiliary battery 18 supplies power to various auxiliary devices. Power is also sent from the driving battery 4 to a voltage converter 19. The voltage converter 19 then steps down the power from the driving battery 4 and supplies it to the auxiliary battery 18.

[0047] As shown in FIG. 2, the driving battery 4 and the inverter 14 are supported by the vehicle frame 2.

[0048] 2, an inverter support portion 42 is supported on the machine frame 2. The inverter support portion 42 is a plate-shaped member that is horizontally oriented. The inverter 14 is placed on the inverter support portion 42.

[0049] 2, the first support frame 43a and the second support frame 43b are supported by the inverter support portion 42. The third support frame 43c is supported by the vehicle frame 2. The battery support portion 44 is provided in a state where it is supported by the first support frame 43a, the second support frame 43b, and the third support frame 43c. The battery support portion 44 is a horizontally oriented plate-shaped member. The battery support portion 44 is provided in a state where it spans the left and right ends of the driving battery 4. The driving battery 4 is placed on the battery support portion 44.

[0050] The vehicle frame 2 also supports a reserve tank 5 , a radiator 15 , an auxiliary battery 18 , and a voltage converter 19 .

[0051] [Regarding stepped areas] 2 and 3, the driving battery 4 has an upper battery section 48 and a lower battery section 49. The upper battery section 48 is located above the lower battery section 49.

[0052] As shown in Fig. 2, the length of the lower battery portion 49 in the front-rear direction is longer than the length of the upper battery portion 48 in the front-rear direction. As shown in Fig. 3, the length of the lower battery portion 49 in the left-right direction is longer than the length of the upper battery portion 48 in the left-right direction. Therefore, as shown in Figs. 2 and 3, a step portion 4b is formed between the upper battery portion 48 and the lower battery portion 49.

[0053] The stepped portion 4b is provided around the entire periphery of the driving battery 4. In other words, the stepped portion 4b is provided on all sides of the driving battery 4, on the front, rear, left and right sides.

[0054] In this manner, the step portion 4b is provided on the side of the driving battery 4.

[0055] [Regarding the frame and connecting parts] 3 and 4, the cover member 12 has a gate-shaped frame portion 12f in a front view and a connecting portion 12g. The frame portion 12f is provided on the inner wall side of the cover member 12. The connecting portion 12g protrudes downward from the lower surface of the upper end portion of the frame portion 12f.

[0056] In this embodiment, two connecting portions 12g are provided, but the present invention is not limited to this, and the number of connecting portions 12g provided may be one, or three or more.

[0057] [Regarding the first support part and the second support part] 3 and 4, the tractor A includes a first support portion 81 and a second support portion 82. The first support portion 81 and the second support portion 82 constitute an element corresponding to the "support portion" according to the present invention.

[0058] 4 to 6, the second support part 82 is configured in a gate shape that straddles the upper end surface 4a of the driving battery 4. As shown in Fig. 4, a gap G is provided between the upper end surface 4a of the driving battery 4 and the second support part 82. The second support part 82 is also attached to the stepped part 4b.

[0059] More specifically, as shown in Figure 6, a hanging portion 4c is formed in the step portion 4b. The hanging portion 4c is a bolt hole used to hang the driving battery 4. Note that while Figure 6 shows the hanging portion 4c on the right rear portion of the driving battery 4, hanging portions 4c are also formed on the right front, left front, and left rear portions of the driving battery 4.

[0060] Furthermore, mounting portions 82a are provided on the left and right lower end portions of the second support portion 82. The mounting portions 82a are formed in the shape of a horizontal plate.

[0061] 6, the right-side mounting part 82a is attached to the suspension part 4c at the right rear of the driving battery 4 with a first bolt b1. The left-side mounting part 82a is attached to the suspension part 4c at the left rear of the driving battery 4 with a first bolt b1.

[0062] That is, the second support part 82 is attached to the hanging part 4c for hanging the driving battery 4, which is provided on the side of the driving battery 4. Furthermore, with the configuration described above, the lower end of the second support part 82 is attached to the side of the driving battery 4.

[0063] In this way, the tractor A is provided with the second support portion 82 attached to the side of the driving battery 4.

[0064] 4 to 6, the first support part 81 extends upward from the upper surface of the upper end part of the second support part 82. In other words, the first support part 81 is supported by the side part of the driving battery 4 via the second support part 82.

[0065] In this embodiment, two first support portions 81 are provided. However, the present invention is not limited to this, and the number of first support portions 81 provided may be one, or three or more.

[0066] In this way, the tractor A is provided with the first support portion 81 that is supported by the driving battery 4. The first support portion 81 is also supported by the side portion of the driving battery 4.

[0067] 4 and 5, the right-side first support portion 81 and the right-side connecting portion 12g are connected by a pin 6 in a state in which they can rotate relatively around the opening / closing axis Q. In addition, the left-side first support portion 81 and the left-side connecting portion 12g are connected by a pin 6 in a state in which they can rotate relatively around the opening / closing axis Q.

[0068] As a result, the cover member 12 is supported by the left and right first support portions 81 in a state in which it can swing around the opening / closing axis Q relative to the left and right first support portions 81.

[0069] That is, the cover member 12 is supported by the first support portion 81 in a state in which it can swing around the opening / closing axis Q relative to the first support portion 81, and is configured to be openable and closable by swinging around the opening / closing axis Q.

[0070] [Regarding the third support part] 2, 5, and 6, a panel unit 37 and a display device 38 are provided in the front of the driver's unit 3. The display device 38 is attached to the panel unit 37. The display device 38 can display various types of information.

[0071] As shown in Figures 4 to 6, a third support section 83 is provided between the driver section 3 and the driving battery 4. As shown in Figure 2, the third support section 83 is supported by the vehicle frame 2. The third support section 83 extends in the vertical direction of the vehicle. Also, as shown in Figures 4 to 6, the third support section 83 is configured in a gate shape.

[0072] In this manner, the tractor A is provided with the third support portion 83 provided between the driving portion 3 and the driving battery 4.

[0073] 2, 5, and 6, a first support stay 85 is connected to the upper surface of the third support portion 83. The first support stay 85 extends rearward from the third support portion 83.

[0074] Additionally, a second support stay 86 extends upward from the top surface of the first support stay 85. A third support stay 87 is connected to the middle portion of the second support stay 86. The third support stay 87 extends in the left-right direction.

[0075] As shown in Fig. 2, the rear portion of the first support stay 85 extends rearward and downward. A fourth support stay 88 is connected to the rear portion of the first support stay 85. The fourth support stay 88 extends in the left-right direction. The left and right ends of the fourth support stay 88 are bent rearward and downward.

[0076] The upper part of the panel part 37 is attached to the left and right ends of the third support stay 87. The lower part of the panel part 37 is attached to the left and right ends of the fourth support stay 88. In other words, the panel part 37 is supported by the third support part 83 via the first support stay 85, the second support stay 86, the third support stay 87, and the fourth support stay 88.

[0077] With this configuration, the display device 38 is supported by the third support portion 83 via the panel portion 37, the first support stay 85, the second support stay 86, the third support stay 87, and the fourth support stay 88.

[0078] 4 to 6, a connecting stay 89 extends rearward from the underside of the upper end portion of the second support portion 82. The rear end portion of the connecting stay 89 is connected to the upper end portion of the third support portion 83 by a second bolt b2. In other words, the second support portion 82 is connected to the third support portion 83 via the connecting stay 89.

[0079] In this embodiment, two connecting stays 89 are provided, one on the left and one on the right. However, the present invention is not limited to this, and the number of connecting stays 89 provided may be one, or three or more.

[0080] This configuration connects the second support portion 82 and the third support portion 83. The third support portion 83 is supported by the driving battery 4 via the connecting stay 89 and the second support portion 82.

[0081] That is, the third support section 83 supports the display device 38 in the driver section 3 and is supported by the driving battery 4.

[0082] 4 to 6, a plurality of horizontal frames 84 are attached to the third support portion 83. The horizontal frames 84 extend in the left-right direction. The horizontal frames 84 are attached to the third support portion 83 from the rear side.

[0083] The electronic control unit 7 is attached to the horizontal frame 84. As a result, the electronic control unit 7 is supported by the third support portion 83 via the horizontal frame 84. The electronic control unit 7 controls each part of the tractor A.

[0084] [Regarding the front cover] 2 and 5, the tractor A is provided with a front cover portion 36. The front cover portion 36 is located behind the cover member 12. The front cover portion 36 covers the electronic control unit 7 and the third support portion 83. The front cover portion 36 also covers the outer edge of the panel portion 37.

[0085] As shown in Fig. 4, two inner mounting portions 36a, one on the left side and one on the right side, are provided on the inner wall side of the front cover portion 36. Also, as shown in Figs. 4 to 6, a cover mounting stay 90 is connected to each of the left and right ends of the second support portion 82. Each cover mounting stay 90 extends rearward and upward from the second support portion 82.

[0086] The left inner mounting portion 36a is attached to the left cover mounting stay 90. The right inner mounting portion 36a is attached to the right cover mounting stay 90.

[0087] With this configuration, the front cover portion 36 is supported by the driving battery 4 via the cover mounting stay 90 and the second support portion 82.

[0088] 2 and 5, the front cover portion 36 is attached to the upper end of the second support stay 86. As a result, the front cover portion 36 is supported by the driving battery 4 via the second support stay 86, the first support stay 85, the third support portion 83, the connecting stay 89, and the second support portion 82.

[0089] According to the configuration described above, the cover member 12 is supported by the first support portion 81, which is supported on the side of the driving battery 4. Therefore, there is no need to provide a support frame behind the driving battery 4 to support the cover member 12. Furthermore, the driving battery 4 can be positioned closer to the driver's section 3, which makes it possible to secure a larger space for arranging the driving battery 4. This makes it possible to increase the size and capacity of the driving battery 4 and also improves layout flexibility.

[0090] Furthermore, the side of a battery such as the driving battery 4 is generally stronger against a force pressing from above than the top plate of the battery. According to the configuration described above, the cover member 12 is supported by the side of the driving battery 4 via the first support portion 81. Therefore, compared to a configuration in which the cover member 12 is supported by the top plate of the driving battery 4, the cover member 12 is supported more stably.

[0091] Therefore, according to the configuration described above, there is no need to secure space behind the driving battery 4 to place a support frame that supports the cover member 12, and a tractor A can be realized in which the cover member 12 is stably supported.

[0092] Other Embodiments (1) Tractor A may be equipped with an engine and configured as a hybrid.

[0093] (2) As shown in Fig. 7, a protrusion 49a protruding in the left-right direction of the vehicle body may be provided at the upper end of the lower battery part 49. In this configuration, a step 4b is formed between the upper battery part 48 and the protrusion 49a. In the example shown in Fig. 7, the protrusion 49a protrudes outward in the left-right direction of the vehicle body beyond the left and right ends of the upper battery part 48. In addition, in the example shown in Fig. 7, the left-right length of the part of the lower battery part 49 below the protrusion 49a is the same as the left-right length of the upper battery part 48.

[0094] (3) The first support portion 81 may be supported directly on the side of the driving battery 4 without the second support portion 82 being interposed therebetween.

[0095] (4) The second support portion 82 may be attached to a portion of the side of the driving battery 4 other than the hanging portion 4c.

[0096] (5) The upper end surface 4a of the driving battery 4 may be in contact with the second support portion 82. In other words, the gap G does not have to be provided between the upper end surface 4a of the driving battery 4 and the second support portion 82.

[0097] (6) The second support portion 82 may be attached to a portion of the side of the driving battery 4 other than the stepped portion 4b. For example, the second support portion 82 may be attached to the side surface of the driving battery 4. Also, the stepped portion 4b does not have to be provided on the side of the driving battery 4.

[0098] (7) The connecting stay 89 does not have to be provided. In other words, the second support portion 82 and the third support portion 83 do not have to be connected. In addition, the third support portion 83 does not have to be supported by the driving battery 4.

[0099] (8) The arrangement of some or all of the components may be reversed left to right.

[0100] (9) The opening / closing axis Q does not have to be aligned with the left-right direction of the aircraft body. For example, the opening / closing axis Q may be aligned with the front-rear direction of the aircraft body.

[0101] The configurations disclosed in the above-described embodiments (including other embodiments, the same applies hereinafter) can be applied in combination with the configurations disclosed in other embodiments, unless a contradiction arises. Furthermore, the embodiments disclosed in this specification are merely examples, and the present invention is not limited to these, and can be modified as appropriate within the scope of the purpose of the present invention. [Industrial Applicability]

[0102] The present invention can be used not only in tractors but also in various electric work vehicles such as combine harvesters, rice transplanters, and construction machines. [Explanation of symbols]

[0103] 4. Driving battery (battery) 4a Top surface 4b Step 10 Front wheels (running gear) 11 Rear wheels (running gear) 12 Cover member 81 1st support part 82 Second support part A Tractor (electric work vehicle) G Gap Medium motor

Claims

1. A battery, a motor driven by power supplied from the battery; a traveling device driven by the motor; a cover member that covers the battery and is configured to be openable and closable; a support portion that supports the cover member, the support portion includes a first support portion that supports the cover member and a second support portion that is arranged to provide a gap between the first support portion and an upper end surface of the battery, the first support portion extends upward from an upper surface of the second support portion, the second support portion includes a lateral support portion extending in a lateral direction, the second support is attached to the battery; The electric work vehicle is arranged so that a gap is provided between the lateral support portion and the upper end surface of the battery.

2. The electric work vehicle according to claim 1 , wherein the second support portion is configured in a gate shape that straddles an upper end surface of the battery.

3. a step portion is provided on a side portion of the battery, The length of the lower part of the battery in the front-rear direction is longer than the length of the upper part of the battery in the front-rear direction, 3. The electric work vehicle according to claim 1, wherein a length of a lower part of the battery in the left-right direction is longer than a length of an upper part of the battery in the left-right direction.

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