Shaft locking device for a vehicle, and vehicle equipped with the device

Abstract

This vehicle shaft lock device comprises a first support body 30 and a second support body 40 that support a wire 10 connected to the axle 2 side, a spring 20 to which the wire 10 is connected, and a distance changer 50. The wire 10 extends from a front end 10a through the first support body 30 and the second support body 40 and connects to the spring 20 at a rear end 10b. During a shaft lock, the distance between the first support body 30 and the second support body 40 is increased so as to pull the wire 10 toward the rear end 10b to raise the axle 2. During traveling of the vehicle, when the distance between the first support body 30 and the front end 10a of the wire 10 changes due to fluctuations in chassis height, the spring 20 extends and contracts to change the position of the rear end 10b of the wire 10, thereby removing slack in the wire 10. Consequently, it is possible to provide a vehicle shaft lock device that is also applicable to vehicles with air suspension.

Description

Technical Field

[0001] The present invention relates to a shaft lock device for lifting the axle of a vehicle.

Background Art

[0002] FIG. 5 is a schematic rear view of a ladder-mounted vehicle during operation. In a ladder-mounted vehicle, the outriggers 8 are extended and jacked up, and the ladder 9 is extended, swiveled, and raised and lowered. However, when the ladder 9 is swiveled, the balance between the left and right may be lost and the vehicle may tilt about twice. When the vehicle tilts, one side of the outrigger 8 lifts off the ground, and the rear wheel 1 on the lifted side extends due to the reduced load, continuously applying a force in the direction of tipping the vehicle. For this reason, a shaft lock device is attached to work vehicles such as ladder-mounted vehicles and boom-mounted vehicles to prevent the stability from deteriorating due to the reaction force of the tires and suspension during the working posture. For example, Patent Document 1 discloses a multi-purpose vehicle including a rotatable ladder or aerial rescue platform and a jack system. The jack system includes lateral ground support for jacking up the vehicle body and stabilizing means for blocking the tilt of the vehicle body in the jacked-up state. The stabilizing means includes a hydraulically operable rear axle block device for blocking the rear axle suspension of the vehicle and a hydraulically lockable shock absorber integrated into the front axle suspension of the vehicle. The rear axle block device and the hydraulically lockable shock absorber are controlled by common hydraulic control means for activating the rear axle block device and locking the hydraulically lockable shock absorber with a delay after activation. Also, although not intended to prevent deterioration of stability during the working posture, Patent Document 2 discloses an automotive suspension device including an axle of a grounding wheel fixed to a pair of control arms mounted so as to be swingable in the vertical direction adjacent to both side portions of a vehicle frame, and an air spring mounted so as to be able to transmit a load between the control arms and the frame. The device has an improved structure in which the axle and the wheel fixed thereto are lifted in accordance with adjustment of the pressure in the air spring, and includes a lever device mounted on the frame by a support shaft device so as to be swingable from one position to the other position. The lever device and the support shaft device are provided separately from the control arms and their mounting devices, and include a spring device mounted on the frame so as to generate a force to swing the lever device to one position, and a link device that generates a lifting force for the axle in response to the lever device swinging from the other position to the one position. The lever, spring, and link devices are arranged in such a relationship that when mounted on the frame, the spring force and the lifting force act along a line where the distance from the support shaft device changes in accordance with the swinging movement of the lever device. When the lever device is swung from the other position to the one position, the distance of the line of action of the spring force increases and the distance of the line of action of the lifting force decreases. An automotive suspension mechanism is disclosed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] As suspensions provided on the chassis of work vehicles, leaf suspensions of the type that absorb shocks by the bending of laminated leaf springs are still common, but air suspensions of the type that absorb shocks by adjusting the air pressure in rubber valves are also increasing. An air suspension-equipped vehicle assumes a working position with the air in the valve released to weaken the suspension function, and although it is more stable than a leaf suspension-equipped vehicle, it is preferable to be equipped with a shaft lock device to further enhance safety. However, in the case of a work vehicle equipped with a leaf suspension, the amount of change in vehicle height due to the deflection of the leaf spring during driving is relatively small, whereas in the case of a vehicle equipped with an air suspension, the amount of change in vehicle height is relatively large, such as being able to change the vehicle height by changing the air pressure in the valve during driving. Therefore, it is difficult to apply the suspension lock device used in a leaf suspension-equipped vehicle to an air suspension-equipped vehicle even if the configuration is somewhat changed. Here, the multi-purpose vehicle described in Patent Document 1 is provided with a stabilizing means for blocking the inclination of the vehicle body in a jacked-up state, but there is no description regarding following when the vehicle height fluctuates during driving. Also, the air suspension device described in Patent Document 2 is not for lifting the axle during the working position to enhance the stability of the vehicle. Although it is described that when the vehicle is operating in an unloaded or lightly loaded state, the pressure in the air spring is released and the axle is lifted by the coil spring and the link to separate the wheels from the road surface, there is no description regarding following when the vehicle height fluctuates with the wheels in contact with the ground. Therefore, an object of the present invention is to provide a shaft lock device for a vehicle that can also be applied to an air suspension-equipped vehicle, and a vehicle equipped with the device.

Means for Solving the Problems

[0005] The shaft locking device for a vehicle according to the present invention as recited in claim 1 is a shaft locking device that raises and holds the vehicle axle 2 of the vehicle, and includes a wire 10 having a tip 10a connected to the axle 2 side, a first support 30 and a second support 40 that are located above the tip 10a of the wire 10 and support the wire 10, a spring 20 to which the rear end 10b of the wire 10 spanned between the first support 30 and the second support 40 is connected, and a distance changer 50 that changes the distance between the first support 30 and the second support 40. The wire 10 has its rear end 10b connected to the spring 20 via the first support 30 and the second support 40 from the tip 10a. When the shaft is locked, the distance between the first support 30 and the second support 40 is increased by the distance changer 50 to pull the wire 10 toward the rear end 10b side to raise the axle 2. During the running of the vehicle, the distance between the first support 30 and the second support 40 is kept constant, and when the distance between the first support 30 and the tip 10a of the wire 10 changes due to the fluctuation of the chassis height, the spring 20 expands and contracts to change the position of the rear end 10b of the wire 10, thereby taking up the slack of the wire 10. The present invention as recited in claim 2 is the shaft locking device for a vehicle according to claim 1, wherein the position of the first support 30 is fixed, the position of the second support 40 is variable, and the distance changer 50 is characterized by moving the second support 40 to change the distance between the first support 30 and the second support 40. The present invention as recited in claim 3 is the shaft locking device for a vehicle according to claim 2, wherein the first support 30 is disposed vertically above the tip 10a of the wire 10, the second support 40 is disposed at the same height as the first support 30, the distance changer 50 is a cylinder connected to the second support 40, and between the first support 30 and the second support 40, the expansion and contraction direction is arranged in the vehicle front-rear direction. The spring 20 is disposed below the distance changer 50, and the expansion and contraction direction is arranged in the vehicle front-rear direction. The present invention as recited in claim 4 is the shaft locking device for a vehicle according to any one of claims 1 to 3, wherein the spring 20, the first support 30, the second support 40, and the distance changer 50 are attached to a frame 7 provided above the chassis 5 of the vehicle. The present invention according to claim 5 is the shaft lock device for a vehicle according to any one of claims 1 to 4, further comprising a restricting body 60 for restricting the extension of the spring 20 between the second support body 40 and the spring 20, with the rear end 10b of the wire 10 disposed between the restricting body 60 and the spring 20. When the wire 10 is pulled toward the front end 10a side and the spring 20 extends, the rear end 10b of the wire 10 abuts against the restricting body 60 and can no longer move toward the second support body 40 side, thereby stopping the extension of the spring 20. The present invention according to claim 6 is the shaft lock device for a vehicle according to any one of claims 1 to 5, further comprising a wire break detector 70 for detecting a break in the wire 10. The wire break detector 70 detects a break in the wire 10 based on whether the rear end 10b of the wire 10 is at a predetermined position when the distance between the first support body 30 and the second support body 40 increases during shaft locking. The present invention according to claim 7 is the shaft lock device for a vehicle according to any one of claims 1 to 6, wherein the first support body 30 and the second support body 40 are pulleys. The present invention according to claim 8 is the shaft lock device for a vehicle according to any one of claims 1 to 7, further comprising a connecting member 80 with the rear end 10b of the wire 10 attached to one side and the spring 20 attached to the other side, and a rail 90 to which the connecting member 80 is attached. The connecting member 80 moves along the rail 90 as the wire 10 or the spring 20 moves. The vehicle according to claim 9 of the present invention is characterized by comprising the shaft lock device for a vehicle according to any one of claims 1 to 8.

Advantages of the Invention

[0006] According to the present invention, it is possible to provide a shaft lock device for a vehicle applicable to a vehicle equipped with an air suspension, and a vehicle equipped with the device.

Brief Description of the Drawings

[0007]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Mode for Carrying Out the Invention

[0008] The shaft locking device for a vehicle according to the first embodiment of the present invention is a shaft locking device that raises and holds the vehicle axle, and includes a wire having a tip connected to the axle side, a first support and a second support that are located above the tip of the wire and support the wire, a spring to which the rear end of the wire spanned between the first support and the second support is connected, and a distance changer that changes the distance between the first support and the second support. The wire has its rear end connected to the spring via the first support and the second support from the tip. When performing shaft locking, the distance between the first support and the second support is increased by the distance changer to pull the wire toward the rear end side and raise the axle. During vehicle traveling, when the distance between the first support and the second support is kept constant and the distance between the first support and the tip of the wire changes due to fluctuations in the chassis height, the spring expands and contracts and the position of the rear end of the wire fluctuates, thereby taking up the slack of the wire. According to the present embodiment, shaft locking can be performed reliably, and the slack of the wire can be effectively prevented during traveling even in an air suspension-equipped vehicle with a large fluctuation range of the chassis height.

[0009] The second embodiment of the present invention is the shaft locking device for a vehicle according to the first embodiment, wherein the position of the first support is fixed, the position of the second support is variable, and the distance changer moves the second support to change the distance between the first support and the second support. According to this embodiment, by fixing the position of the first support that serves as the fulcrum of the portion of the wire extending in the vertical direction, the axle can be smoothly lifted.

[0010] In the third embodiment of the present invention, in the shaft lock device of the vehicle according to the second embodiment, the first support is disposed vertically above the tip of the wire, the second support is disposed at the same height as the first support, the distance changing device is a cylinder connected to the second support, and between the first support and the second support, the expansion and contraction direction is arranged in the vehicle front-rear direction, and the spring is disposed below the distance changing device with the expansion and contraction direction in the vehicle front-rear direction. According to this embodiment, the shaft lock device can be compactly integrated and the required mounting space can be made relatively small.

[0011] In the fourth embodiment of the present invention, in the shaft lock device of the vehicle according to any one of the first to third embodiments, a spring, a first support, a second support, and a distance changing device are attached to a frame provided above the chassis of the vehicle. According to this embodiment, the shaft lock device can be attached using the frame.

[0012] In the fifth embodiment of the present invention, in the shaft lock device of the vehicle according to any one of the first to fourth embodiments, a restricting body for restricting the extension of the spring is provided between the second support and the spring, the rear end of the wire is disposed between the restricting body and the spring, and when the wire is pulled to the tip side and the spring extends, the rear end of the wire abuts against the restricting body and can no longer move to the second support side, thereby stopping the extension of the spring. According to this embodiment, by restricting the extension of the spring by the restricting body, it becomes easier to lift the axle when locking the shaft.

[0013] The sixth embodiment of the present invention is a shaft lock device for a vehicle according to any one of the first to fifth embodiments, and includes a wire break detector for detecting a break in the wire. The wire break detector detects a break in the wire based on whether the rear end of the wire is at a predetermined position when the distance between the first support and the second support increases when the shaft lock is performed. According to this embodiment, a break in the wire can be detected simply and reliably.

[0014] The seventh embodiment of the present invention is a shaft lock device for a vehicle according to any one of the first to sixth embodiments, in which the first support and the second support are pulleys. According to this embodiment, the movement of the wire can be made smooth and it can be made difficult to break.

[0015] The eighth embodiment of the present invention is a shaft lock device for a vehicle according to any one of the first to seventh embodiments, and includes a connecting member having the rear end of the wire attached to one side and a spring attached to the other side, and a rail to which the connecting member is attached. The connecting member moves along the rail as the wire or the spring moves. According to this embodiment, the movements of the wire and the spring can be made smooth.

[0016] A vehicle according to the ninth embodiment of the present invention includes a shaft lock device for a vehicle according to any one of the first to eighth embodiments. According to this embodiment, the shaft lock can be performed reliably, and the slack of the wire can be effectively prevented during running even in a vehicle with a large variation in chassis height such as a vehicle equipped with an air suspension.

Example

[0017] Hereinafter, a shaft lock device for a vehicle according to an embodiment of the present invention will be described. FIG. 1 is a diagram showing a shaft lock device for a vehicle according to this embodiment. In FIG. 1, a shaft lock device attached to the left rear wheel side is shown, but a shaft lock device is also attached to the right rear wheel side. Further, in FIG. 1, both the case where the axle and the rear wheel are located above and the case where they are located below are shown. The axle (rear axle) 2 of the rear wheel 1 is supported by an arm 4 having one end connected to the lower part of a bracket 3. The bracket 3 has an upper part attached to the chassis 5 in front of the axle 2 and a lower part protruding below the lower surface of the chassis 5. An air valve 6 functioning as an air suspension is attached to the other end of the arm 4. Further, a frame 7 is attached above the chassis 5.

[0018] The shaft lock device of the vehicle includes a wire 10 for lifting the axle 2, a spring 20 having one end 20a fixed to the frame 7 and extending horizontally, a first support 30 and a second support 40 for supporting the wire 10 above the tip 10a of the wire 10, a hydraulic cylinder 50 as a distance changer for changing the distance between the first support 30 and the second support 40, a regulator 60 for restricting the extension of the spring 20, a wire break detector 70 for detecting a break in the wire 10, a connecting member 80 for connecting the wire 10 and the spring 20, and a rail 90 to which the connecting member 80 is attached. The wire 10 has its tip 10a connected to the arm 4 which is a support member of the axle 2 via an attachment piece 100, and its rear end 10b connected to the other end 20b of the spring 20 via a connecting member 80. The attachment piece 100 is fixed to the arm 4 with a pin 110, and the connection part with the wire 10 is rotatable. Further, the attachment piece 100 is clamped together with the axle (rear axle) 2 to the arm 4. The hydraulic cylinder 50 is attached to the frame 7 with its expansion and contraction direction horizontal between the first support 30 and the second support 40.

[0019] The first support 30 is a pulley with a fixed position and is attached to the frame 7 directly above the tip 10a of the wire 10. The second support 40 is a movable pulley whose horizontal position can be changed, and is attached to the frame 7 in front of the first support 30. The mounting heights (vertical positions) of the first support 30 and the second support 40 are the same. The movable part of the hydraulic cylinder 50 is connected to the second support 40, and the second support 40 reciprocates in the vehicle longitudinal direction by the expansion and contraction of the hydraulic cylinder 50. By using the first support 30 and the second support 40 as pulleys as in this embodiment, the movement of the sliding wire 10 can be smoothed and it is difficult to break the wire. One end 20a of the spring 20 is attached to the frame 7 directly below the second support 40, and the other end 20b is fixed to the connecting member 80. The rear end 10b of the wire 10 is fixed to the connecting member 80 from the direction opposite to the spring 20. That is, the wire 10 is attached to the connecting member 80 from one side, and the spring 20 is attached from the other side. Between the tip 10a of the wire 10 and the first support 30, there is a pulling-up portion 10c that extends substantially vertically in the vehicle up-and-down direction. The wire 10 changes its direction by 90 degrees at the first support 30, and between the first support 30 and the second support 40, there is a tension portion 10d that extends substantially horizontally in the vehicle longitudinal direction. The wire 10 is folded back by 180 degrees at the second support 40, and between the second support 40 and the spring 20, there is a folded-back portion 10e that extends substantially horizontally in the vehicle longitudinal direction.

[0020] In FIG. 1, α indicates the movable range of the hydraulic cylinder 50, β indicates the movable range of the spring 20, and γ indicates the distance from the pin 110 to the upper surface of the chassis 5. The total length obtained by adding the length of the spring 20 to the length of the wire 10 changes depending on the degree of expansion and contraction of the spring 20, but “the distance from the pin 110 to the upper surface of the chassis 5 - the length of the spring 20 + the cylinder stroke of the hydraulic cylinder 50 × 2” is constant during shaft lock and during running. As in this embodiment, a spring 20, a first support 30, a second support 40, and a hydraulic cylinder 50 are attached to a frame 7 provided above a chassis 5 of a vehicle. The first support 30 is disposed vertically above the tip of a wire 10, the second support 40 is disposed at the same height as the first support 30, the hydraulic cylinder 50 is disposed between the first support 30 and the second support 40 with its telescopic direction being the vehicle longitudinal direction, and the spring 20 is disposed below the hydraulic cylinder 50 with its telescopic direction being the vehicle longitudinal direction. By doing so, the shaft lock device can be compactly assembled and attached using the frame 7, and the required attachment space can be made relatively small.

[0021] The restricting body 60 is disposed between the second support 40 and the spring 20, and the rear end 10b of the wire 10 is disposed on the spring 20 side with respect to the restricting body 60. When the wire 10 is pulled toward the tip 10a side, the spring 20 extends and the rear end 10b of the wire 10 approaches the second support 40. However, since the rear end 10b of the wire 10 cannot move beyond the restricting body 60, the extension of the spring 20 stops when the rear end 10b of the wire 10 abuts against the restricting body 60.

[0022] The rail 90 is provided at a position corresponding to the movement range of the rear end 10b of the wire 10. A connecting member 80 slidably engaged with the rail 90 moves along the rail 90 as the wire 10 or the spring 20 moves. Thereby, the movement of the wire 10 and the spring 20 at the folding-back portion 10e can be made smooth.

[0023] FIG. 2 is a diagram showing the operation of the shaft lock device when shaft locking is performed. When performing shaft locking, the chassis height is set to the lowest, and the air valve 6 is in a non-expanded state with air bled off. Shaft locking is performed, for example, simultaneously with the extension of outriggers or jacking up. When the shaft is locked, the hydraulic cylinder 50 is extended forward to move the second support 40 forward in parallel. As a result, as the second support 40 moves away from the first support 30, the tension portion 10d and the folded-back portion 10e of the wire 10 are pulled forward, and accordingly, the lifting portion 10c is pulled upward. For this reason, the arm 4 to which the tip 10a of the wire 10 is connected is lifted, the axle 2 moves upward, and is held at a predetermined height. At this time, when the rear end 10b of the wire 10 abuts against the restricting body 60 provided immediately in front of the second support 40 as described above, the extension of the spring 20 is stopped, thereby restricting the rear end 10b of the wire 10 from moving more than necessary and making it easier to lift the axle 2. In order to more reliably prevent the vehicle from tilting during work, it is preferable that the axle 2 can be lifted until the rear wheel 1 leaves the ground. In the state of shaft lock, the wire tension is relatively large. As described above, when the shaft is locked, by increasing the distance between the first support 30 and the second support 40, the wire 10 can be pulled toward the rear end 10b side to lift the axle 2. Further, by moving the second support 40 in which the wires 10 on both sides are directed in the direction opposite to the moving direction during shaft lock, for example, if the cylinder stroke is 130 mm, the wire 10 can be pulled 260 mm. Since the pulling distance of the wire 10 by the second support 40 can be set to twice the cylinder stroke, the distance between the first support 30 and the second support 40 can be made relatively short, and the shaft lock device can be arranged compactly. Further, by fixing the position of the first support 30 that serves as the fulcrum of the lifting portion 10c of the wire 10, the axle 2 can be lifted smoothly. When releasing the shaft lock, the hydraulic cylinder 50 is contracted to move the second support 40 backward in parallel. As a result, the tip 10a of the wire 10 drops, so that the axle 2 can be returned to its original position.

[0024] The restricting body 60 is provided with a proximity sensor that detects that the rear end 10b (connecting member 80) of the wire 10 has approached the restricting body 60. When the shaft lock is performed, the disconnection detector 70 detects disconnection based on whether the proximity sensor reacts when the distance between the first support 30 and the second support 40 increases, that is, whether the rear end 10b of the wire 10 is in a position close to the restricting body 60. As described above, when the shaft lock is performed, the wire 10 is configured such that the folded-back portion 10e is pulled forward as the second support 40 moves forward, so that the rear end 10b approaches the second support 40. However, when the wire is disconnected, even if the second support 40 moves forward, the wire 10 is not pulled and the rear end 10b does not approach the second support 40. Therefore, if the proximity sensor does not react during shaft lock, it can be determined that the wire is disconnected. Thus, according to the disconnection detection of this embodiment, disconnection of the wire 10 can be detected simply and reliably.

[0025] FIGS. 3 and 4 are views showing the state of the shaft lock device during traveling. The hydraulic cylinder 50 is fixed so as not to expand and contract during traveling. FIG. 3 shows a state in which the chassis height is maximized by expanding the air valve with air. When the air valve 6 expands and extends downward, the tip side of the arm 4 is pushed down, so that a strong force acts on the wire 10 in the direction of pulling down the tip 10a. Since the connecting portion of the attachment piece 100 with the wire 10 is rotatable, the pulled-up portion 10c of the wire 10 can maintain substantially vertical even when the arm 4 rotates downward. When the arm 4 descends, the wire 10 is pulled downward at the pulled-up portion 10c, and accordingly, the tension portion 10d is pulled rearward and the folded-back portion 10e is pulled forward. Since the rear end 10b of the wire 10 is connected to the spring 20 and the horizontal position is variable, the spring 20 extends as the folded-back portion 10e is pulled forward, and the rear end 10b of the wire 10 moves forward. Then, the tip 10a descends by the amount that the rear end 10b has moved forward. In this way, when the vehicle height is increased, the wire 10 can smoothly follow the change in the vehicle height. In the state where the chassis height is maximized, the wire tension is relatively small.

[0026] Figure 4 shows the state where the chassis height is minimized by discharging the air from the air valve. When the air valve 6 contracts, the arm 4 rotates and the tip side rises. At this time, compared with the state where the chassis height is maximized, as the force by which the arm 4 pulls down the tip 10a of the wire 10 becomes smaller, the force by which the wire 10 pulls the spring 20 weakens. Therefore, the spring 20 contracts and the rear end 10b of the wire 10 moves rearward. Thereby, the excess portion of the wire 10 due to the rise of the arm 4 is absorbed by the spring 20, and the slack of the wire 10 can be eliminated. In this way, when the vehicle height is lowered, the spring 20 contracts to automatically prevent the slack of the wire 10, so that the wire 10 can be kept in an appropriate state following the change in the vehicle height. In the state where the chassis height is minimized, the wire tension is relatively small. In this embodiment, air cannot be introduced into the air valve 6 during the shaft lock, and control is performed such that air can be introduced into the air valve 6 after the release of the shaft lock.

[0027] As described above, the shaft lock device for a vehicle according to the present invention can surely perform the shaft lock, and can effectively prevent the slack of the wire 10 during traveling not only in a vehicle equipped with a leaf suspension but also in a vehicle equipped with an air suspension having a large variation width of the chassis height (vehicle height).

Explanation of Reference Numerals

[0028] 2 Axle 5 Chassis 6 Air valve 7 Frame 10 Wire 10a Tip 10b Rear end 20 Spring 30 First support 40 Second support 50 Distance changer (hydraulic cylinder) 60 Regulator 70 Disconnection detector 80 Connecting member 90 rails

Claims

1. A shaft locking device for raising and holding an axle of a vehicle, comprising: a wire having a tip connected to the axle side; a first support and a second support that are located above the tip of the wire and support the wire; a spring to which the rear end of the wire spanned between the first support and the second support is connected; a distance changer for changing the distance between the first support and the second support; the wire has its rear end connected to the spring via the first support and the second support from the tip; when shaft locking, the distance between the first support and the second support is increased by the distance changer to pull the wire toward the rear end side to raise the axle; during traveling of the vehicle, the distance between the first support and the second support is kept constant, and when the distance between the first support and the tip of the wire changes due to fluctuations in chassis height, the spring expands and contracts and the position of the rear end of the wire fluctuates, thereby taking up the slack of the wire. A shaft locking device for a vehicle, characterized in that.

2. The shaft locking device for a vehicle according to claim 1, wherein the position of the first support is fixed, the position of the second support is variable, and the distance changer moves the second support to change the distance between the first support and the second support.

3. The first support is disposed vertically above the tip of the wire; the second support is disposed at the same height as the first support; the distance changer is a cylinder connected to the second support, and is disposed between the first support and the second support with the expansion and contraction direction in the vehicle front-rear direction; The shaft locking device for a vehicle according to claim 2, wherein the spring is disposed below the distance changer with the expansion and contraction direction in the vehicle front-rear direction.

4. The shaft locking device for a vehicle according to any one of claims 1 to 3, wherein the spring, the first support, the second support, and the distance changer are attached to a frame provided above the chassis of the vehicle.

5. A restricting body for restricting the extension of the spring is provided between the second support and the spring; the rear end of the wire is disposed between the restricting body and the spring. When the wire is pulled toward the tip side and the spring extends, the rear end of the wire abuts against the restricting body and can no longer move toward the second support body, whereby the extension of the spring stops. The shaft lock device for a vehicle according to any one of claims 1 to 4, characterized in that.

6. It is provided with a wire break detector for detecting a break in the wire, The wire break detector detects the wire break depending on whether or not the rear end of the wire is at a predetermined position when the distance between the first support body and the second support body increases when the shaft lock is performed. The shaft lock device for a vehicle according to any one of claims 1 to 5, characterized in that.

7. The first support body and the second support body are pulleys. The shaft lock device for a vehicle according to any one of claims 1 to 6, characterized in that.

8. A connecting member having the rear end of the wire attached to one side and the spring attached to the other side, A rail to which the connecting member is attached, The connecting member moves along the rail as the wire or the spring moves. The shaft lock device for a vehicle according to any one of claims 1 to 7, characterized in that.

9. A vehicle comprising the shaft lock device for a vehicle according to any one of claims 1 to 8.

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