WO2023175944A1

WO2023175944A1 - Vehicle shaft lock device and vehicle comprising same

Info

Publication number: WO2023175944A1
Application number: PCT/JP2022/012753
Authority: WO
Inventors: 和也石田; 勝敏溝添
Original assignee: 株式会社モリタホールディングス
Priority date: 2022-03-18
Filing date: 2022-03-18
Publication date: 2023-09-21
Also published as: CN117881556A

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

Vehicle shaft lock device and vehicle equipped with the device

The present invention relates to a shaft lock device that lifts the axle of a vehicle.

FIG. 5 is a schematic diagram of the ladder-equipped vehicle during work, viewed from behind. In a vehicle equipped with a ladder, the ladder 9 is extended, turned, and raised while the outrigger 8 is extended and jacked up. However, when the ladder 9 is turned, the left and right balance is lost and the vehicle tilts about 2 degrees. It may tilt. When the vehicle tilts, the outrigger 8 on one side lifts off the ground, and the rear wheel 1 on the lifted side reduces its load and stretches, continuing to apply force in the direction of overturning the vehicle. For this reason, work vehicles such as ladder-equipped vehicles and boom-equipped vehicles are equipped with shaft lock devices that prevent stability from worsening due to reaction forces of tires and suspensions during working positions.
For example, Patent Document 1 includes a swingable ladder or aerial rescue platform and a jack system, and the jack system provides lateral ground support for jacking up the vehicle body and blocks tilting of the vehicle body in the jacked up state. a hydraulically operable rear axle blocking device for blocking the rear axle suspension of the vehicle; and a hydraulically lockable rear axle blocking device integrated into the front axle suspension of the vehicle. The rear axle blocking device and the hydraulically lockable damping device are provided with a damping device, and the rear axle blocking device and the hydraulically lockable damping device are operated by a common hydraulic control means that activates the rear axle blocking device and locks the hydraulically lockable damping device with a delay after activation. A controlled utility vehicle is disclosed.
Furthermore, although the purpose is not to prevent deterioration of stability during working postures, Patent Document 2 discloses a pair of control arms mounted adjacent to both sides of the vehicle frame so as to be able to swing vertically. In an automobile suspension system that includes a ground wheel axle fixed to a ground wheel and an air spring mounted to transmit a load between a control arm and a frame, the axle and the It has an improved structure for lifting the wheel fixed to this, and is equipped with a lever device installed on the frame by a supporting shaft device so as to be able to swing from one position to the other. The device is separate from the control arm and its mounting device, and includes a spring device mounted on the frame to create a force that swings the lever device from one position to the other. a linkage that produces a lifting force on the axle as it swings into position; the lever, spring, and linkage are arranged such that when mounted on the frame, the spring force and the lifting force are applied to the swinging movement of the lever arrangement; The spring force is arranged in such a relationship that it acts along a line whose distance from the pivot device changes accordingly, and when the lever device is swung from one position to the other, the distance of the line of action of the spring force increases. However, an automobile suspension mechanism is disclosed in which the distance of the line of action of the lifting force is reduced.

Japanese Patent Application Publication No. 2015-157620 Special Publication No. 52-11968

Most suspensions installed on the chassis of work vehicles are still leaf suspensions, which absorb shock through the curvature of stacked leaf springs, but there are also air suspensions, which absorb shock by adjusting the air pressure inside rubber valves. It is increasing. Vehicles equipped with air suspension are more stable than vehicles equipped with leaf suspension because the air in the valves is removed and the suspension function is weakened to maintain a working posture. Preferably, it is attached.
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 while driving is relatively small, whereas in the case of a vehicle equipped with an air suspension, the amount of change in vehicle height due to the bending of the leaf spring while driving is relatively small. The amount of change in vehicle height is relatively large, as it is possible to change the vehicle height by changing the air pressure in the vehicle. Therefore, it is difficult to apply a suspension lock device used in a vehicle equipped with a leaf suspension to a vehicle equipped with an air suspension, even if the structure is slightly modified.
Here, the utility vehicle described in Patent Document 1 is equipped with a stabilizing means for blocking the tilting of the vehicle body in the jacked-up state, but there is no description of how to follow changes in vehicle height while driving.
Further, the air suspension device described in Patent Document 2 is not designed to raise the axle in the working position to improve the stability of the vehicle. Furthermore, it is stated that when the vehicle is operating under no load or light load, the pressure in the air spring is released and the coil spring and link lift the axle to lift the wheel off the road surface. There is no description of how the vehicle will follow when the vehicle height changes.
SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a shaft locking device for a vehicle that can be applied to a vehicle equipped with an air suspension, and a vehicle equipped with the device.

A shaft locking device for a vehicle according to the present invention according to claim 1 is a shaft locking device for raising and holding an axle 2 of a vehicle, and includes a wire 10 having a tip 10a connected to the axle 2 side, and a tip 10a of the wire 10. The first support 30 and the second support 40 that are located above the wire 10 and support the wire 10 are connected to the rear end 10b of the wire 10 that spans the first support 30 and the second support 40. The wire 10 is provided with a spring 20 and a distance changer 50 that changes the distance between the first support 30 and the second support 40, and the wire 10 is extended from the tip 10a through the first support 30 and the second support 40. The rear end 10b is connected to the spring 20, and when the shaft is locked, the wire 10 is pulled toward the rear end 10b by increasing the distance between the first support 30 and the second support 40 using the distance changer 50. While the vehicle is running, the distance between the first support 30 and the second support 40 is kept constant, and the distance between the first support 30 and the tip 10a of the wire 10 changes as the chassis height changes. When the wire 10 changes, the spring 20 expands and contracts to change the position of the rear end 10b of the wire 10, thereby taking up the slack in the wire 10.
The present invention according to claim 2 is the shaft locking device for a vehicle according to claim 1, in which the first support body 30 has a fixed position, the second support body 40 has a variable position, and the distance changing device 50 has the following features: The feature is that the distance between the first support 30 and the second support 40 is changed by moving the second support 40.
The present invention according to claim 3 is the shaft locking device for a vehicle according to claim 2, in which the first support 30 is disposed vertically above the tip 10a of the wire 10, and the second support 40 is disposed vertically above the tip 10a of the wire 10. The distance changing device 50 is a cylinder arranged at the same height as the support 30 and connected to the second support 40, and is arranged between the first support 30 and the second support 40 in the direction of expansion and contraction of the vehicle. The spring 20 is arranged in the front-rear direction, and the spring 20 is arranged below the distance changer 50 so that the direction of expansion and contraction is in the vehicle front-rear direction.
The present invention according to claim 4 provides a shaft locking device for a vehicle according to any one of claims 1 to 3, in which a spring 20 is attached to a frame 7 provided above a chassis 5 of the vehicle. It is characterized in that a body 30, a second support 40, and a distance changer 50 are attached.
The present invention according to claim 5 is a shaft locking device for a vehicle according to any one of claims 1 to 4, in which expansion of the spring 20 is restricted between the second support body 40 and the spring 20. A regulating body 60 is provided, and the rear end 10b of the wire 10 is disposed between the regulating body 60 and the spring 20, and when the wire 10 is pulled toward the tip 10a and the spring 20 is expanded, the rear end 10b of the wire 10 is disposed between the regulating body 60 and the spring 20. The spring 20 is characterized in that the extension of the spring 20 is stopped when it comes into contact with the body 60 and cannot move any further toward the second support body 40 .
According to a sixth aspect of the present invention, the shaft locking device for a vehicle according to any one of claims 1 to 5 includes a disconnection detector 70 for detecting a disconnection of the wire 10. When the shaft lock is performed, when the distance between the first support body 30 and the second support body 40 becomes large, disconnection is detected by checking whether the rear end 10b of the wire 10 is in a predetermined position. Features.
The present invention according to claim 7 is the shaft locking device for a vehicle according to any one of claims 1 to 6, characterized in that the first support body 30 and the second support body 40 are pulleys. do.
The present invention according to claim 8 is the shaft locking device for a vehicle according to any one of claims 1 to 7, in which the rear end 10b of the wire 10 is attached to one side and the spring 20 is attached to the other side. The connecting member 80 is characterized in that the connecting member 80 is provided with a connecting member 80 and a rail 90 to which the connecting member 80 is attached, and that the connecting member 80 moves along the rail 90 as the wire 10 or the spring 20 moves.
A vehicle according to a ninth aspect of the present invention is characterized by comprising the vehicle shaft locking device according to any one of claims 1 to 8.

According to the present invention, it is possible to provide a shaft locking device for a vehicle that can also be applied to a vehicle equipped with an air suspension, and a vehicle equipped with the device.

A diagram showing a shaft locking device for a vehicle according to an embodiment of the present invention. Diagram showing the operation of the shaft locking device when locking the shaft A diagram showing the operation of the shaft locking device when the chassis height is maximized during the same run. Diagram showing the operation of the shaft locking device when the chassis height is set to the minimum during the same run. Schematic rear view of a vehicle equipped with a ladder during work

A shaft locking device for a vehicle according to a first embodiment of the present invention is a shaft locking device that raises and holds an axle of a vehicle, and includes a wire whose tip is connected to the axle side, and a wire whose tip is connected to the axle side. a first support body and a second support body positioned to support the wire; a spring to which the rear end of the wire is connected and spanned over the first support body and the second support body; The wire is equipped with a distance changing device that changes the distance from the support, and the rear end of the wire is connected to the spring from the tip through the first support and the second support, and when the shaft is locked, the distance changing device changes the distance between the wire and the support. By increasing the distance between the first support and the second support, the wire is pulled toward the rear end to raise the axle, and while the vehicle is running, the distance between the first support and the second support is constant. When the distance between the first support and the tip of the wire changes due to a change in the height of the chassis, the spring expands and contracts to change the position of the rear end of the wire, thereby taking up the slack in the wire.
According to this embodiment, the shaft can be reliably locked, and even in a car equipped with an air suspension in which the chassis height fluctuates widely, it is possible to effectively prevent the wire from becoming loose during driving.

A second embodiment of the present invention is a shaft locking device for a vehicle according to the first embodiment, in which the first support body is fixed in position, the second support body is variable in position, and the distance changing device is The distance between the first support and the second support is changed by moving the second support.
According to this embodiment, by fixing the position of the first support body, which serves as a fulcrum for the vertically extending portion of the wire, the axle can be pulled up smoothly.

A third embodiment of the present invention is a shaft locking device for a vehicle according to the second embodiment, in which the first support body is arranged vertically above the tip of the wire, and the second support body is arranged vertically above the tip of the wire. Disposed at the same height as the body, the distance changing device is a cylinder connected to the second support body, and is disposed between the first support body and the second support body with the expansion and contraction direction being the longitudinal direction of the vehicle, The spring is disposed below the distance changer with its expansion and contraction direction being in the longitudinal direction of the vehicle.
According to this embodiment, the shaft lock device can be made compact and the required installation space can be made relatively small.

A fourth embodiment of the present invention is a shaft locking device for a vehicle according to any one of the first to third embodiments, in which a spring is mounted on a frame provided above a chassis of a vehicle, a first support body is provided, A second support and a distance changer are attached.
According to this embodiment, the shaft lock device can be attached using the frame.

A fifth embodiment of the present invention is a shaft locking device for a vehicle according to any one of the first to fourth embodiments, in which a regulating body is provided between the second support body and the spring to regulate the extension of the spring. The rear end of the wire is arranged between the regulating body and the spring, and when the wire is pulled toward the tip side and the spring is expanded, the rear end of the wire abuts the regulating body and the wire is placed on the second support side. The spring stops expanding when it is no longer able to move.
According to this embodiment, by restricting the extension of the spring by the regulating body, it becomes easier to lift the axle when the shaft is locked.

A sixth embodiment of the present invention is a shaft locking device for a vehicle according to any one of the first to fifth embodiments, which includes a wire breakage detector that detects a wire breakage, and the wire breakage detector is a shaft lock device that detects a wire breakage. When locking is performed, wire breakage is detected based on whether the rear end of the wire is at a predetermined position when the distance between the first support body and the second support body becomes large.
According to this embodiment, disconnection can be easily and reliably detected.

A seventh embodiment of the present invention is a shaft locking 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 wire breakage can be prevented.

An eighth embodiment of the present invention provides a shaft locking device for a vehicle according to any one of the first to seventh embodiments, in which a rear end of a wire is attached to one side and a spring is attached to the other side. and a rail to which a connecting material is attached, and the connecting material moves along the rail as the wire or spring moves.
According to this embodiment, the movement of the wire and the spring can be made smooth.

A vehicle according to a ninth embodiment of the present invention includes the vehicle shaft locking device according to any one of the first to eighth embodiments.
According to this embodiment, the shaft can be reliably locked, and even in a vehicle with a large variation in chassis height, such as a vehicle equipped with an air suspension, it is possible to effectively prevent the wire from becoming loose during driving.

Hereinafter, a shaft locking device for a vehicle according to an embodiment of the present invention will be described.
FIG. 1 is a diagram showing a shaft locking device for a vehicle according to this embodiment. Although FIG. 1 shows the shaft locking device attached to the left rear wheel, the same shaft locking device is also attached to the right rear wheel. Further, in FIG. 1, the axle, rear wheel, etc. are shown both in the case where they are located on the upper side and the case where they are located on the lower side.
An axle (rear axle) 2 of a rear wheel 1 is supported by an arm 4 whose one end is connected to the lower part of a bracket 3. The upper part of the bracket 3 is attached to the chassis 5 in front of the axle 2, and the lower part projects 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.

A shaft locking device for a vehicle includes a wire 10 that lifts an axle 2, a spring 20 whose one end 20a is fixed to a frame 7 and expands and contracts horizontally, and a first support 30 that supports the wire 10 above the tip 10a of the wire 10. and the second support 40, the hydraulic cylinder 50 as a distance changer that changes the distance between the first support 30 and the second support 40, the regulation body 60 that regulates the extension of the spring 20, and the wire 10 being disconnected. It includes a disconnection detector 70 that detects a disconnection detector 70, a connecting member 80 that connects the wire 10 and the spring 20, and a rail 90 to which the connecting member 80 is attached.
The wire 10 has a tip 10a connected to the arm 4, which is a support member of the axle 2, via a mounting piece 100, and a rear end 10b connected to the other end 20b of the spring 20 via a connecting member 80. There is. The mounting piece 100 is fixed to the arm 4 with a pin 110, and the portion connected to the wire 10 is rotatable. Further, the mounting piece 100 is fastened to the arm 4 together with the axle (rear axle) 2.
The hydraulic cylinder 50 is attached to the frame 7 between the first support body 30 and the second support body 40 with the direction of expansion and contraction being horizontal.

The first support 30 is a pulley whose position is fixed, and is attached to the frame 7 vertically 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 body 30 and the second support body 40 are the same. A movable portion of a hydraulic cylinder 50 is connected to the second support body 40, and as the hydraulic cylinder 50 expands and contracts, the second support body 40 reciprocates in the longitudinal direction of the vehicle.
By using the first support 30 and the second support 40 as pulleys as in this embodiment, the sliding wire 10 can move smoothly and be difficult to break.
The spring 20 has one end 20a attached to the frame 7 directly below the second support 40, and the other end 20b fixed to the connecting member 80. The rear end 10b of the wire 10 is fixed to the connecting member 80 from the opposite direction 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.
The wire 10 has a lifting portion 10c that extends approximately vertically in the vertical direction of the vehicle between the tip 10a and the first support 30, and the wire 10 is turned 90 degrees at the first support 30 to form a lifting portion 10c. Between the first support 30 and the second support 40 is a tension portion 10d that extends approximately horizontally in the longitudinal direction of the vehicle, and is folded back 180 degrees at the second support 40 to form the second support 40. A portion between the spring 20 and the folded portion 10e is a portion that extends substantially horizontally in the longitudinal direction of the vehicle.

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, which is the sum of the length of the wire 10 and the length of the spring 20, varies depending on the degree of expansion and contraction of the spring 20, but it is calculated as follows: "distance from the pin 110 to the top surface of the chassis 5 - length of the spring 20 + cylinder of the hydraulic cylinder 50" Stroke x 2'' is constant between when the shaft is locked and when the vehicle is running.
As in this embodiment, the spring 20, the first support 30, the second support 40, and the hydraulic cylinder 50 are attached to the frame 7 provided above the chassis 5 of the vehicle, and the first support 30 is attached to the frame 7. It is arranged vertically above the tip of the wire 10, the second support 40 is arranged at the same height as the first support 30, and the hydraulic cylinder 50 is extended and contracted between the first support 30 and the second support 40. By arranging the spring 20 with its direction as the longitudinal direction of the vehicle and arranging the spring 20 below the hydraulic cylinder 50 with its expansion and contraction direction as the longitudinal direction of the vehicle, the shaft locking device can be mounted compactly using the frame 7, and the required installation space can be reduced. can be made relatively small.

The regulating body 60 is disposed between the second support body 40 and the spring 20, and the rear end 10b of the wire 10 is disposed closer to the spring 20 than the regulating body 60.
When the wire 10 is pulled toward the tip 10a, the spring 20 expands and the rear end 10b of the wire 10 approaches the second support 40, but the rear end 10b of the wire 10 does not move beyond the regulating body 60. Therefore, when the rear end 10b of the wire 10 comes into contact with the regulating body 60, the spring 20 stops expanding.

The rail 90 is provided at a position corresponding to the movement range of the rear end 10b of the wire 10. The connecting member 80 that is 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 in the folded portion 10e can be made smooth.

FIG. 2 is a diagram showing the operation of the shaft locking device when locking the shaft.
When locking the shaft, the chassis height is set to the minimum, and the air valve 6 is in a deflated, non-inflated state. Shaft locking is performed simultaneously with, for example, extending or jacking up the outriggers.
When the shaft is locked, the second support body 40 is translated forward by extending the hydraulic cylinder 50 forward. As a result, as the second support body 40 moves away from the first support body 30, the tension portion 10d and the folded portion 10e of the wire 10 are pulled forward, and the pull-up portion 10c is accordingly pulled upward. Therefore, the arm 4 to which the tip 10a of the wire 10 is connected is pulled up, and the axle 2 is moved upward and held at a predetermined height. At this time, as described above, when the rear end 10b of the wire 10 comes into contact with the regulating body 60 provided immediately in front of the second support 40, the extension of the spring 20 is stopped. This makes it easier to lift the axle 2 by restricting the end 10b from moving more than necessary. In order to more reliably prevent the vehicle from tilting during work, it is preferable to lift the axle 2 until the rear wheels 1 are off the ground. In the shaft locked state, the wire tension is relatively high.
In this manner, 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 and the axle 2 can be lifted. Furthermore, by moving the second support 40 in which the wires 10 on both sides are oriented in the opposite direction to the movement direction when locking the shaft, for example, if the cylinder stroke is 130 mm, the wire 10 can be pulled by 260 mm. As described above, since the pulling distance of the wire 10 by the second support body 40 can be twice the cylinder stroke, the distance between the first support body 30 and the second support body 40 can be relatively shortened to achieve shaft lock. The device can be arranged compactly.
Further, by fixing the position of the first support body 30, which is the fulcrum of the lifting portion 10c of the wire 10, the axle 2 can be pulled up smoothly.
Note that when releasing the shaft lock, the hydraulic cylinder 50 is retracted to move the second support body 40 backward in parallel. This lowers the tip 10a of the wire 10, allowing the axle 2 to return to its original position.

The regulating body 60 is provided with a proximity sensor that detects when the rear end 10b (connecting member 80) of the wire 10 approaches the regulating body 60.
The disconnection detector 70 detects whether the proximity sensor is responding when the distance between the first support 30 and the second support 40 becomes large when the shaft is locked, that is, the rear end of the wire 10. A disconnection is detected depending on whether the wire 10b is located close to the regulating body 60 or not. As described above, when the shaft is locked, the folded portion 10e of the wire 10 is pulled forward as the second support 40 moves forward, so that the rear end 10b approaches the second support 40. However, if the wire is broken, even if the second support 40 moves forward, the wire 10 will not be pulled and the rear end 10b will not approach the second support 40. Therefore, if the proximity sensor does not react when the shaft is locked, it can be determined that the wire is disconnected. As described above, according to the disconnection detection of this embodiment, a disconnection of the wire 10 can be easily and reliably detected.

3 and 4 are diagrams showing the state of the shaft locking device while the vehicle is running. The hydraulic cylinder 50 is fixed so as not to expand or contract while the vehicle is running.
FIG. 3 shows a state in which the chassis height is maximized by inflating 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 a strong force acts on the wire 10 in the direction of pulling down the tip 10a. In addition, since the connection portion of the attachment piece 100 with the wire 10 is rotatable, even when the arm 4 rotates downward, the pulled-up portion 10c of the wire 10 can remain substantially vertical.
When the arm 4 is lowered, the pulling portion 10c of the wire 10 is pulled downward, the pulling portion 10d is pulled rearward, and the folded portion 10e is pulled forward. Since the rear end 10b of the wire 10 is connected to a spring 20 and its horizontal position is variable, when the folded portion 10e is pulled forward, the spring 20 is expanded and the rear end 10b of the wire 10 moves forward. The leading end 10a is lowered by the amount that the rear end 10b moves forward. In this way, when raising the vehicle height, the wire 10 can smoothly follow changes in vehicle height.
With the chassis at its maximum height, the wire tension is relatively low.

FIG. 4 shows a state in which the chassis height is minimized by letting the air out of the air valve.
When the air valve 6 contracts, the arm 4 rotates and its distal end side rises. At this time, compared to the state where the chassis height is the highest, the force with which the arm 4 pulls down the tip 10a of the wire 10 becomes smaller, and the force with which the wire 10 pulls the spring 20 weakens, so the spring 20 contracts. The rear end 10b of the wire 10 moves rearward. As a result, 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 taken up.
In this way, when the vehicle height is lowered, the spring 20 contracts and automatically prevents the wire 10 from becoming loose, so that the wire 10 can be maintained in an appropriate state following changes in the vehicle height.
With the chassis at its lowest height, the wire tension is relatively low.
In this embodiment, the air valve 6 cannot be filled with air while the shaft is locked, and the air valve 6 can be filled with air after the shaft lock is released.

As explained above, the vehicle shaft locking device of the present invention can reliably lock the shaft, and can also be used not only for vehicles equipped with leaf suspension but also for vehicles equipped with air suspension, which have a large variation in chassis height (vehicle height). It is possible to effectively prevent the wire 10 from becoming loose during running.

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 change tool (hydraulic cylinder)
60 Regulator 70 Disconnection detector 80 Connection material 90 Rail

Claims

A shaft locking device for raising and holding an axle of a vehicle,
a wire whose tip is 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 connected to the rear end of the wire that spans the first support and the second support;
comprising a distance changer that changes the distance between the first support and the second support;
The rear end of the wire is connected to the spring from the tip through the first support and the second support,
When locking the shaft, increase the distance between the first support body and the second support body using the distance changer to pull the wire toward the rear end side and raise the axle;
While the vehicle is running, the distance between the first support and the second support is constant, and when the distance between the first support and the tip of the wire changes due to a change in chassis height, A shaft locking device for a vehicle, wherein the spring expands and contracts to change the position of the rear end of the wire, thereby removing slack in the wire.
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. The shaft locking device for a vehicle according to claim 1, characterized in that the shaft locking device changes:
The first support is arranged vertically above the tip of the wire,
The second support is arranged at the same height as the first support,
The distance changer is a cylinder connected to the second support, and is arranged between the first support and the second support with the expansion and contraction direction being the longitudinal direction of the vehicle,
3. The shaft locking device for a vehicle according to claim 2, wherein the spring is disposed below the distance changer so that the direction of expansion and contraction is the longitudinal direction of the vehicle.
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. A shaft locking device for a vehicle according to any one of the items.
comprising a regulating body between the second support body and the spring, which regulates the extension of the spring;
The rear end of the wire is disposed between the regulating body and the spring,
When the wire is pulled toward the tip side and the spring is expanded, the rear end of the wire comes into contact with the regulating body and cannot move any further toward the second support, thereby preventing the spring from expanding. The shaft lock device for a vehicle according to any one of claims 1 to 4, wherein the shaft lock device stops.
comprising a disconnection detector that detects disconnection of the wire,
The disconnection detector detects whether the rear end of the wire is at a predetermined position when the distance between the first support body and the second support body becomes large when the shaft lock is performed. The shaft locking device for a vehicle according to any one of claims 1 to 5, wherein the disconnection is detected.
The shaft lock device for a vehicle according to any one of claims 1 to 6, wherein the first support and the second support are pulleys.
a connecting member having the rear end of the wire attached to one side and the spring attached to the other side;
and a rail to which the connecting material is attached,
The shaft locking device for a vehicle according to any one of claims 1 to 7, wherein the connecting member moves along the rail as the wire or the spring moves.
A vehicle comprising the vehicle shaft locking device according to any one of claims 1 to 8.