Work vehicle

Abstract

The present invention comprises: a vehicle body 1; traveling devices that are located on both left and right sides of the vehicle body 1; and a detachable object V that is located between the left and right traveling devices and that is detachable from the vehicle body, wherein the detachable object V has an auxiliary wheel 35 that contacts the ground in a state in which the detachable object V is detached from the vehicle body and that assists movement of the detachable object.

Description

Work vehicle

[0001] The present invention relates to a work vehicle suitable for traveling on a work site with many irregularities or an inclined work site.

[0002] An example of a work vehicle is disclosed in Patent Document 1. In Patent Document 1, it includes left and right traveling devices (referred to as "wheels" in the patent document) and hydraulic equipment (referred to as "hydraulic pump" and "cylinder control valve" in Patent Document 1).

[0003] Japanese Patent Application Laid-Open No. 2023-092158

[0004] Among work vehicles suitable for traveling on a work site with many irregularities or an inclined work site, those driven by electric power stored in a battery are known. In such a work vehicle, when the battery is built-in or fixed, the work vehicle cannot be used during battery charging. Therefore, it is preferable that the battery has a detachable configuration.

[0005] However, batteries used in work vehicles are often relatively heavy. Therefore, in replacing the battery, the operator has to carry the heavy battery, which is inconvenient.

[0006] Therefore, an object of the present invention is to provide a work vehicle in which the attachment and detachment of attachments are easy and the convenience is high.

[0007] The characteristic configuration of the work vehicle according to the present invention includes a machine body, traveling devices located on both the left and right sides of the machine body, and an attachment located between the left and right traveling devices and detachable from the machine body. The attachment has auxiliary wheels that ground when the attachment is detached from the machine body and assist in the movement of the attachment.

[0008] According to the present invention, the attachment has auxiliary wheels. With this configuration, when the operator transports the attachment, the operator can use the auxiliary wheels for transportation. As a result, the operator does not need to lift the attachment and can work easily. The attachment is, for example, a battery, a chemical tank for spraying, an engine unit, etc.

[0009] The characteristic configuration of the work vehicle according to the present invention is that it is equipped with a human-operated device that allows the running device to be operated manually, the human-operated device is provided at one end of the machine in the front-rear direction, and the attachment and detachment items are preferably attached to and detached from the machine from the opposite side of the end of the machine in the front-rear direction from which the human-operated device is provided.

[0010] Since manual operating tools are used to operate work vehicles, they are placed in a position that is relatively easy for workers to operate. To ensure the operability of manual operating tools, it is preferable not to place anything that would hinder their operation around them.

[0011] According to the present invention, attachments and detachments are made from the opposite side of the manual operating tool. This configuration is convenient because the attachment and detachment of attachments and detachments do not interfere with the operation of the manual operating tool.

[0012] A characteristic feature of the work vehicle according to the present invention is that the detachable part can be removed from the machine by pulling it towards the front of the machine.

[0013] According to the present invention, attachments can be removed by pulling them forward. With this configuration, attachments will not unexpectedly detach due to the machine's forward movement. As a result, the operator can continue working stably.

[0014] A characteristic configuration of the work vehicle according to the present invention is that the detachable part preferably has a locking mechanism on the front side of the machine body for fixing the detachable part to the machine body.

[0015] According to the present invention, the locking mechanism is located on the front side of the machine body when attaching or detaching the device. This makes it easier to prevent forgetting to lock the device compared to when the locking mechanism is located on the rear side, as the locking mechanism is located closer to the operator.

[0016] The characteristic configuration of the work vehicle according to the present invention is that the detachable part supports the auxiliary wheels and has an auxiliary wheel support mechanism that can change the posture between a stowed position in which the auxiliary wheels are separated from the ground and a running position in which the auxiliary wheels are in contact with the ground, and it is preferable that the auxiliary wheel support mechanism changes the auxiliary wheels to the stowed position when the detachable part is attached to the machine body.

[0017] According to the present invention, the auxiliary wheel support mechanism can be changed between a stowed position and a running position. As a result, when the work vehicle is running with attachments mounted on the machine body, the auxiliary wheels are reliably lifted off the ground, allowing the work vehicle to run stably.

[0018] The characteristic configuration of the work vehicle according to the present invention is such that the detachable part has a rotating body that can be driven to rotate, the machine body has a guide part that guides the rotating body, and the guide part has an inclined portion that is located higher towards the rear of the machine body.

[0019] According to the present invention, the rotating body is guided along the inclined section. This allows the worker to move the attachment / detachment object to a higher position relative to the ground simply by pushing it in the forward and backward directions, and then attach the attachment / detachment object to the worker.

[0020] The characteristic configuration of the work vehicle according to the present invention is that it is equipped with hydraulic equipment supported by the machine body, and the detachable parts are preferably located below the hydraulic equipment.

[0021] Generally, detachable parts are often relatively heavy. Such heavy parts can easily affect the overall weight balance of the work vehicle. Also, if the center of gravity is high, the work vehicle is more prone to tipping over.

[0022] According to the present invention, the detachable parts are located below the hydraulic equipment. This allows the center of gravity of the entire work vehicle to be kept low, enabling stable driving.

[0023] The characteristic configuration of the work vehicle according to the present invention is that the detachable part has a main body located below the hydraulic equipment when the detachable part is attached to the machine body, a handle provided on one end of the main body, and auxiliary wheels provided on the other end of the main body, and it is preferable that the upper end of the handle is located above the upper end of the main body.

[0024] According to the present invention, when the operator pulls up the handle, the main body tilts, and the object to be attached or detached is supported on the ground via auxiliary wheels. As a result, compared to configurations where the object to be attached or detached is lifted, the operator can handle the object with relatively little force. In addition, because the upper end of the handle is positioned above the upper end of the main body, the operator can grip the handle in a comfortable posture.

[0025] This is a side view of the work vehicle. This is a top view of the work vehicle. This is a front view of the work vehicle. This is a top view of the support mechanism. This is a side view of the support mechanism. This is a side view showing the running posture of the auxiliary wheel support mechanism. This is a top view showing the battery mounting. This is a side view showing the storage of the auxiliary wheel support mechanism when the battery is mounted. This is a side view showing the stored posture of the auxiliary wheel support mechanism. This is a bottom view showing the main parts of the machine and battery in the mounted state.

[0026] In the following explanation, unless otherwise specified, the direction of arrow F in the diagram will be considered "forward," the direction of arrow B will be considered "backward," the direction of arrow L will be considered "left," the direction of arrow R will be considered "right," the direction of arrow U will be considered "up," and the direction of arrow D will be considered "down."

[0027] As shown in Figure 1-3, the work vehicle comprises a machine body 1 that is roughly rectangular in plan view, running wheels 2 (the "running device" according to the present invention) located on both the left and right sides of the machine body 1, a plurality of driven wheels 3 provided corresponding to each of the plurality of running wheels 2, a support mechanism A that supports the plurality of running wheels 2 in a state in which their position relative to the machine body 1 can be individually changed, a plurality of hydraulic motors 4 that drive the running wheels 2, and a battery V (the "detachable part" according to the present invention).

[0028] The running wheels 2 are located at the front and rear on both the left and right sides of the machine body 1. In this embodiment, the work vehicle is equipped with four running wheels 2: left front, right front, left rear, and right rear. The running wheels 2 rotate around the horizontal axis X3.

[0029] Support mechanism A is supported by the machine body 1. In this embodiment, the work vehicle is equipped with four support mechanisms A corresponding to the four running wheels 2: left front, right front, left rear, and right rear. Support mechanism A includes an articulated link mechanism 5 and a plurality of hydraulic cylinders 6, 7 that can individually change the posture of the articulated link mechanism 5.

[0030] Furthermore, the structure of the driving wheels 2, driven wheels 3, and support mechanism A of the work vehicle in this embodiment is symmetrical front to back, and the work vehicle can travel in both the forward and backward directions as defined in the figure.

[0031] The aircraft body 1 is equipped with a cargo platform 8 on which cargo can be placed. The cargo platform 8 is located on the upper surface of the aircraft body 1.

[0032] The machine body 1 is equipped with hydraulic equipment C as a device for supplying hydraulic fluid to the hydraulic motor 4 and hydraulic cylinders 6 and 7. Hydraulic equipment C includes an oil tank for storing hydraulic fluid, a hydraulic control valve 13 (an example of a valve) for adjusting the amount of hydraulic fluid supplied, and a hydraulic pump for supplying hydraulic fluid to the hydraulic motor 4 and hydraulic cylinders 6 and 7. Hydraulic equipment C is supported by the machine body 1 and is located under the cargo bed 8. When hydraulic equipment C is driven, the hydraulic pump is activated, and the hydraulic motor 4 and hydraulic cylinders 6 and 7 are activated via the hydraulic control valve 13.

[0033] A battery V is located below the hydraulic equipment C. The battery V is positioned between the left and right running wheels 2 and is configured to be detachable from the machine body 1.

[0034] The machine body 1 is equipped with a lever-shaped operating lever 10 (the "manual operating device" according to the present invention) at one end in the front-rear direction for manually operating the running wheels 2. In this embodiment, the operating lever 10 is located at the rear end of the machine body 1. By tilting the operating lever 10 forward, backward, left, or right, the machine body 1 moves in those directions. The operating lever 10 is not limited to a lever shape and may be, for example, equipped with a touch panel. In this case, the machine body 1 may be made to move in any direction by touching the touch panel, or it may be configured to automatically move to any point. Furthermore, the height of the machine body 1 in the vertical direction may be controlled by controlling hydraulic equipment C.

[0035] [Support Mechanism] As described above, the support mechanism A comprises a bending link mechanism 5 and a plurality of hydraulic cylinders 6 and 7. As shown in Figure 1, the plurality (specifically four) of running wheels 2 are supported via the bending link mechanism 5 in a manner that allows each to be individually repositioned relative to the machine body 1.

[0036] As shown in Figures 4 and 5, the articulated link mechanism 5 includes a base end 14 supported by the machine body 1, a first link 15 whose upper end is supported at the lower part of the base end 14 so as to be rotatable around a horizontal axis X1, and a second link 16 whose one end is supported at the lower end of the first link 15 so as to be rotatable around a horizontal axis X2 and whose other end supports a running wheel 2.

[0037] As shown in Figure 5, the support bracket 17 that supports the running wheel 2 is supported by a boss portion 18 provided at the pivoting end (other end) of the second link 16 so as to be able to pivot around the vertical axis Y1. A hydraulic cylinder for pivoting operation (hereinafter referred to as the pivot cylinder 20) is provided extending from the bracket 19 at one end of the second link 16 to the arm portion 17a provided on the support bracket 17.

[0038] Each of the multiple articulated link mechanisms 5 is provided with multiple hydraulic cylinders 6 and 7 that can individually change the orientation of each articulated link mechanism 5. Specifically, there is a first hydraulic cylinder 6 that can change the swing orientation of the first link 15 relative to the aircraft body 1, and a second hydraulic cylinder 7 that can change the swing orientation of the second link 16 relative to the first link 15.

[0039] When the first hydraulic cylinder 6 is extended or retracted while the second hydraulic cylinder 7 is stopped, the first link 15, the second link 16, and the running wheel 2 each oscillate integrally around the horizontal axis X1 of the pivot connection point to the base end 14 while maintaining a constant relative posture. When the second hydraulic cylinder 7 is extended or retracted while the first hydraulic cylinder 6 is stopped, the second link 16 and the running wheel 2 oscillate integrally around the horizontal axis X2 of the connection point between the first link 15 and the second link 16, while maintaining a constant posture of the first link 15.

[0040] A driven wheel 3 is rotatably supported at the intermediate bending portion of each of the multiple bending link mechanisms 5. The driven wheel 3 is made up of a wheel with approximately the same outer diameter as the running wheel 2. The pivot shaft that pivotally connects the first link 15 and the second link 16 is extended so as to protrude outward in the width direction of the vehicle body, and the driven wheel 3 is rotatably supported at the extended protruding portion of the pivot shaft.

[0041] By operating the swivel cylinder 20, the traveling wheels 2 can be swiveled by rotating them around the vertical axis Y1 with respect to the folding link mechanism 5.

[0042] By adjusting the flow rate of the hydraulic fluid by the hydraulic control valve 13 corresponding to the hydraulic motor 4, the rotational speed of the hydraulic motor 4, that is, the rotational speed of the traveling wheels 2 can be changed.

[0043] In the following description, since it is provided symmetrically on the left and right, only one side on the left or right will be described based on the drawings.

[0044] [Structure of the battery] As shown in FIG. 6, the battery V has a main body portion 31 located below the hydraulic equipment C when mounted on the machine body 1, a handle portion 30 provided on the front side which is one end side of the main body portion 31, and an auxiliary wheel 35 provided on the rear side which is the other end side of the main body portion 31. Inside the main body portion 31, a battery cell or the like is provided, and it can be connected to the machine body 1 by a harness or the like at the front end portion.

[0045] On the front side of the battery V, a handle portion 30 held by an operator is provided. The handle portion 30 has a shape in which a pipe-shaped member is bent into a U-shape and is connected to the lower side of the main body portion 31.

[0046] As shown in FIG. 7, the battery V has a locking mechanism 34 for fixing the battery V to the machine body 1 on the front side. The locking mechanism 34 has a locking portion 41 bent in an L-shape, an elastic member 42 that biases the locking portion 41, and a locking hole through which the locking portion 41 passes. The locking holes are provided at the lower end portion of the handle portion 30 and the lower end portion of the machine body 1, and the elastic member 42 biases the locking portion 41 in the direction of inserting the locking portion 41 into the locking hole. The locking portion 41 is configured to be insertable into a locking hole provided in the machine body 1.

[0047] Specifically, a locking portion 41 is provided on the inner side in the left - right direction of the handle portion 30, and the long - side portion of the locking portion 41 extends in the left - right direction. The elastic member 42 biases the locking portion 41 toward the outside of the machine body. The locking portion 41 penetrates the handle portion 30 and is inserted into a lock hole provided in the machine body 1. By pulling the locking portion 41 inward toward the inside of the machine body against the biasing force of the elastic member 42, the locking portion 41 can be pulled out from the lock hole provided in the machine body 1, and the fixing of the battery V to the machine body 1 in the locking mechanism 34 can be released. The locking mechanism 34 is provided below the handle portion 30.

[0048] As shown in FIG. 8, below the main body portion 31, the battery V has an auxiliary wheel 35 that grounds the battery V in a state where the battery V is detached from the machine body 1 and assists the movement of the battery V, a first rotator 32 (the "rotator" according to the present invention) that can rotate passively, an auxiliary wheel support mechanism 33 provided inside the machine body more than the first rotator 32, which supports the auxiliary wheel 35 and can change its posture between a storage posture in which the auxiliary wheel 35 is separated from the ground and a traveling posture in which the auxiliary wheel 35 is grounded, and a first guide portion 37 provided on the front side of the main body portion 31. The auxiliary wheel 35 is provided at the rear end portion of the battery V and is configured to be rotatable around the horizontal axis X4. The auxiliary wheel 35 is provided on the side opposite to the handle portion 30 in the front - rear direction. The first rotator 32 is located outside the auxiliary wheel 35 and the auxiliary wheel support mechanism 33 in the left - right direction.

[0049] [Auxiliary Wheel Support Mechanism] As shown in Figures 8 and 9, the battery V has auxiliary wheels 35 on both the left and right sides at the bottom, an auxiliary wheel support mechanism 33, and a biasing member (not shown) that biases the auxiliary wheel support mechanism 33. The auxiliary wheel support mechanism 33 is supported so as to be able to swing around the horizontal axis X5 and supports the auxiliary wheels 35 at its free end. The biasing member biases the auxiliary wheel support mechanism 33 toward the driving posture. The regulating member 36 is provided on the rear and lower side of the horizontal axis X5 and restricts the swinging of the auxiliary wheel support mechanism 33. Specifically, when the auxiliary wheel support mechanism 33 swings toward the rear, the auxiliary wheel support mechanism 33 comes into contact with the regulating member 36. This restricts the counterclockwise swinging of the auxiliary wheel support mechanism 33 in Figure 8. The biasing member is made of a coil spring or the like.

[0050] In the driving position, the horizontal axis X5 of the auxiliary wheel support mechanism 33 is located in front of the horizontal axis X4. In the stowed position, the horizontal axis X5 is located behind the horizontal axis X4. When the battery V is attached to the machine body 1, or in the driving position, the upper end of the handle portion 30 is located above the upper end of the main body portion 31. This allows the operator to grip the handle portion 30 in a relatively comfortable posture without bending over. As shown in Figure 6, when the handle portion 30 is lifted by the operator, the auxiliary wheels 35 are located directly below or behind the horizontal axis X5 in the front-rear direction.

[0051] With the battery V mounted on the aircraft body 1, the upper end of the handle portion 30 is positioned below the cargo bed portion 8. This prevents interference between the cargo and the handle portion 30 when placing cargo that is larger than the cargo bed portion 8 in a plan view.

[0052] [Structure of the Aircraft Body] As shown in Figures 8 and 9, the aircraft body 1 has a second guide part 50 (the "guide part" according to the present invention) on the underside of the aircraft body 1 that guides the first rotating body 32 to a predetermined position to lock the battery V, and a second rotating body 51 that is capable of driven rotation. The second guide part 50 is located on the rear side of the aircraft body 1, and the second rotating body 51 is located on the front side of the aircraft body 1. The second guide part 50 and the second rotating body 51 are provided in a substantially horizontal position in the vertical direction. When the battery V is mounted on the aircraft body 1, the first rotating body 32 and the second rotating body 51 are located in substantially the same position in the left-right direction (see Figure 10). That is, the first rotating body 32 and the second rotating body 51 are located outward from the auxiliary wheel support mechanism 33 in the left-right direction. In this embodiment, the first rotating body 32 and the second rotating body 51 are made of bearings, but are not limited to this.

[0053] [First Guide Section] As shown in Figures 8, 9, and 10, the first guide section 37 has a horizontal plate 37a that contacts the second rotating body 51 provided on the machine body 1, a vertical plate 37b that is located towards the center of the left-right direction of the machine body towards the rear, and a front locking section 37c that locks the horizontal plate 37a and the vertical plate 37b to the main body section 31. The rear end of the handle section 30 is fixed to the main body section 31 by a locking section 41.

[0054] The horizontal plate 37a is shaped by bending a flat plate-like member and has a first inclined portion 39 located higher towards the rear and a contact portion 38 at the front that contacts the second rotating body 51. When the battery V is attached to the machine body 1, the second rotating body 51 passes below the first inclined portion 39 along the first inclined portion 39. When the second rotating body 51 passes below the first inclined portion 39, the front side of the battery V is supported by the second rotating body 51 at the first guide portion 37, and the front side of the battery V rises relative to the ground by the amount of the inclination of the first inclined portion 39.

[0055] The contact portion 38 is in contact with the second rotating body 51 when the battery V is attached to the aircraft body 1.

[0056] The front locking portion 37c is formed in the shape of a bent plate member, extending in the front-to-back direction and being formed in a gate shape with the inside of the machine open. The front locking portion 37c has a vertical side surface 45, and the rear end of the handle portion 30 is located inside the vertical side surface 45, in other words, in the space enclosed by the main body portion 31 and the front locking portion 37c. A horizontal plate 37a and a vertical plate 37b are located on the left-right outer side of the vertical side surface 45.

[0057] [Second Guide Section] As shown in Figures 8, 9, and 10, the second guide section 50 is located at the rear end of the machine body, and the second rotating body 51 is located at the front end of the machine body. The second guide section 50 has a shape formed by bending a flat plate and has an inclined portion 50a that is located higher towards the rear, and a fixed portion 50b that is continuous with the rear end of the inclined portion 50a, extends upward, and is bent forward at its upper end.

[0058] By pushing the battery V from the front of the aircraft body 1, the first rotating body 32 provided on the battery V slides over the inclined portion 50a while rotating under its own power. The battery V is fixed when the first rotating body 32 comes into contact with the fixing portion 50b. When the battery V is mounted on the aircraft body 1, the first rotating body 32 comes into contact with the fixing portion 50b, and the auxiliary wheel support mechanism 33 comes into contact with the storage pin 52 provided on the aircraft body 1, resulting in the stored position. The auxiliary wheel support mechanism 33 can change its position by moving away from the ground by the amount of the inclination of the inclined portion 50a relative to the ground.

[0059] The second guide section 50 has a retraction pin 52 at its rear end, which is a rod-shaped member bent into an L shape. The retraction pin 52 is located below the second guide section 50 and extends inward in the left-right direction. The auxiliary wheel support mechanism 33 comes into contact with the retraction pin 52 when the battery V is mounted on the aircraft body 1. As shown in Figure 9, when the battery V is mounted on the aircraft body 1, the retraction pin 52 is located in front of the horizontal axis X5. The auxiliary wheel support mechanism 33, which has come into contact with the retraction pin 52 from the front (see Figure 8), is then pushed further towards the rear, causing the auxiliary wheel support mechanism 33 to swing forward (see Figure 9). As a result, the auxiliary wheel support mechanism 33 changes its posture to the retracted position.

[0060] The auxiliary wheels 35 and the auxiliary wheel support mechanism 33 are located to the left and right inward of the first rotating body 32 and the second rotating body 51 in the left-right direction. In a side view, the front running wheel 2 overlaps with the first guide section 37 and the second rotating body 51. In a side view, the rear running wheel 2 overlaps with the second guide section 50 and the first rotating body 32.

[0061] [Coordination between the guide unit and the rotating body when the battery is installed] As shown in Figure 7, the operation of the battery V and the aircraft 1 when the battery V is installed will be explained. The battery V is attached to and detached from the aircraft from the opposite side (front end) of the rear end, which is one end in the front-to-rear direction where the operating lever 10 of the aircraft 1 is provided. In other words, the battery V can be installed by pushing it from the front side of the aircraft 1.

[0062] When the battery V is pushed into the machine body 1 from the front, the rear of the battery V passes between the running wheels 2 and reaches below the hydraulic equipment C. At this time, the auxiliary wheel support mechanism 33 is located inside the machine body relative to the second rotating body 51 and therefore does not come into contact with the second rotating body 51.

[0063] When the battery V is pushed further backward while the first rotating body 32 is positioned at the front end of the second guide portion 50, the first rotating body 32 rides onto the inclined portion 50a. At this time, the rear end of the first guide portion 37 is positioned on the upper part of the second rotating body 51, and the pushing operation causes the second rotating body 51 to push the front side of the battery V upward via the first guide portion 37.

[0064] The lateral position of the battery V relative to the aircraft body 1 is determined by the vertical plate 37b. Specifically, when the second rotating body 51 pushes the front side of the battery V upward, the vertical plate 37b comes into contact with the second rotating body 51. As described above, the vertical plate 37b is located closer to the center of the aircraft body in the lateral direction towards the rear, so when the battery V is pushed from the front, it moves left and right along the vertical plate 37b so that the lateral center of the battery V and the lateral center of the aircraft body 1 approximately coincide.

[0065] When the first rotating body 32 is pushed to the rear of the second guide section 50, the front of the first guide section 37 is positioned above the second rotating body 51. At this time, the auxiliary wheel support mechanism 33 is in contact with the storage pin 52 (see Figure 8).

[0066] When the battery V is pushed further backward while the first rotating body 32 is positioned behind the second guide section 50, the storage pin 52 comes into contact with the auxiliary wheel support mechanism 33 and swings forward. The auxiliary wheel support mechanism 33 changes the auxiliary wheels 35 to the stored position when the battery V is mounted on the aircraft body 1. At this time, the first rotating body 32 comes into contact with the rear end of the second guide section 50. Also, the second rotating body 51 comes into contact with the front end of the first guide section 37. The driving position refers to the position in which the relative position of the auxiliary wheels 35 with respect to the battery V is fixed by the auxiliary wheel support mechanism 33 coming into contact with the regulating member 36. The stored position refers to the position in which the relative position of the auxiliary wheels 35 with respect to the battery V is fixed by the auxiliary wheel support mechanism 33 coming into contact with the storage pin 52. Specifically, the state shown in Figures 6 and 8 is the driving position, and the state shown in Figures 9 and 10 is the stored position.

[0067] Although not described in detail, the locking portion 41 has a mechanism that fixes it in an open state (held in a position inside the aircraft body). In this embodiment, the locking mechanism 34 can be maintained in an open state by swinging it around the axis in the direction in which the locking portion 41 extends. That is, when attaching or detaching the battery V, the locking mechanism 34 can be held in an open state to prevent the locking portion 41 from colliding with the aircraft body 1.

[0068] When installing the battery V, the locking mechanism 34 is held in the open position as described above, and the battery V is installed on the aircraft body 1. When the first rotating body 32 comes into contact with the fixing part 50b and the second rotating body 51 comes into contact with the contact part 38, the locking part 41 is swung, causing the locking part 41 to be inserted into the locking hole and the lock hole. As a result, the battery V is fixed to the aircraft body 1 by the locking mechanism 34.

[0069] To remove the battery V, the locking mechanism 34 is released by pulling it inward towards the aircraft body, and the battery V can be removed from the aircraft body 1 by pulling it towards the front of the aircraft body 1. At this time, the auxiliary wheel support mechanism 33 assumes a driving posture from the point when it is no longer in contact with the storage pin 52.

[0070] [Alternative Embodiments] (1) The operating lever 10 does not need to be provided. For example, the machine 1 may be automatically controlled by a control device or the like, or it may be a wired remote control or the like.

[0071] (2) The auxiliary wheel support mechanism 33 does not need to change its posture. In other words, the posture of the auxiliary wheel support mechanism 33 may be fixed.

[0072] (3) A non-rotating member may be provided instead of the first rotating body 32 and the second rotating body 51. For example, a member with a smooth surface may be provided that is less likely to generate friction between the first guide portion 37 and the second guide portion 50.

[0073] (4) The locking mechanism 34 is not required. For example, the battery V may be maintained in its mounted state by its own weight. Also, the form of the locking mechanism 34 is not limited to this embodiment. For example, it may be fixed by bolts or the like.

[0074] (5) The battery V does not have to be removed by pulling it forward relative to the aircraft 1. For example, the battery V may be removed by pulling it backward or to the side relative to the aircraft 1.

[0075] (6) It is not necessary to provide hydraulic equipment C. The running wheels 2 and the support mechanism A may be driven by electric motors or the like, each provided with one of them.

[0076] (7) The handle portion 30 does not need to be provided. For example, when transporting the battery V, a separate transport aid such as a trolley may be provided, or a transport assist handle may be provided that is attached only when transporting the main body portion 31.

[0077] (8) In the above-described embodiment, an example was given in which the detachable part is a battery V. The work vehicle may be equipped with other detachable parts. For example, the detachable parts may include an engine unit as a power source for the work vehicle, a fuel tank, a hydrogen cylinder, a fuel cell, etc. For example, the detachable parts may include a storage unit for storing agricultural materials (water for spraying, chemicals, fertilizers, etc.), harvested crops, cut grass, etc.

[0078] This invention can be applied to work vehicles suitable for traveling on uneven terrain. These work vehicles can be used in mountainous areas, forests, fields and their surroundings, riverbanks, construction sites, and the like.

[0079] 1: Main body 2: Running wheels (running mechanism) 10: Operating lever (manual operation tool) 30: Handle 31: Main body 32: First rotating body (rotating body) 33: Auxiliary wheel support mechanism 34: Locking mechanism 35: Auxiliary wheel 50: Second guide section (guide section) 50a: Inclined section A: Support mechanism C: Hydraulic equipment V: Battery (detachable part)

Claims

1. A work vehicle comprising: a machine body; running devices located on both the left and right sides of the machine body; and a detachable object located between the left and right running devices and detachable from the machine body, wherein the detachable object makes contact with the ground when detached from the machine body and has auxiliary wheels that assist in the movement of the detachable object.

2. The work vehicle according to claim 1, comprising a manual operating tool that allows the running device to be operated manually, wherein the manual operating tool is provided at one end of the machine in the front-rear direction, and the attachment / detachment part is attached to and detached from the machine from the opposite side of the end of the machine in the front-rear direction from which the manual operating tool is provided.

3. The work vehicle according to claim 1 or 2, wherein the attachment / detachment can be removed from the machine by pulling it towards the front of the machine.

4. The work vehicle according to any one of claims 1 to 3, wherein the detachable object has a locking mechanism on the front side of the machine body for fixing the detachable object to the machine body.

5. The detachable part supports the auxiliary wheel and has an auxiliary wheel support mechanism that can change the position of the auxiliary wheel between a stowed position in which the auxiliary wheel is separated from the ground and a running position in which the auxiliary wheel is in contact with the ground, wherein the auxiliary wheel support mechanism changes the position of the auxiliary wheel to the stowed position when the detachable part is attached to the machine body, as described in any one of claims 1 to 4.

6. The work vehicle according to any one of claims 3 to 5, wherein the detachable part has a driven rotating body, the machine has a guide portion for guiding the rotating body, and the guide portion has an inclined portion that is located higher towards the rear of the machine.

7. A work vehicle according to any one of claims 1 to 6, comprising hydraulic equipment supported by the machine body, wherein the detachable parts are located below the hydraulic equipment.

8. The work vehicle according to claim 7, wherein the detachable part comprises a main body located below the hydraulic equipment when the detachable part is attached to the machine body, a handle provided on one end of the main body, and an auxiliary wheel provided on the other end of the main body, the upper end of the handle being located above the upper end of the main body.

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