JPH0125116Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field) This invention relates to an improvement of a steering lock device for a vehicle.

(Background technology) For example, as a steering lock device for a large special vehicle such as a crane truck, a power cylinder is attached to the rear wheels in addition to the front wheels, and in addition to front two-wheel steering, four-wheel steering and so-called crab-leg steering are possible. There are things you can do.

By the way, such a steering device is equipped with a steering lock device in order to reliably lock the steering of the rear wheels when driving on a public road with two front wheels steered.

As this type of locking device, one constructed as shown in Figs.
175469).

In this case, 1 indicates a hydraulic cylinder (power cylinder) for the rear wheel, and the base end of the hydraulic cylinder 1 is connected to the axle 2, and the tip of the piston rod is pin-coupled to one end of the steering knuckle 3 of the rear wheel for free rotation. Ru.

The hydraulic cylinder 1 expands and contracts in accordance with the direction and angle of rotation of a steering handle (not shown) during crab-leg steering of four wheels, and changes the direction of the rear wheels integrally with the front wheels.

4 is a lock lever; one end of the lock lever 4 is rotatably pin-coupled to the steering knuckle 3 like the piston rod of the hydraulic cylinder 1, and the other end is slidably supported by a bracket 5 attached to the axle 2. .

Reference numeral 6 designates a lock cylinder disposed on the bracket 5. The lock cylinder 6 has a lock pin 7 formed at the tip of a piston rod 6A.
When the lock lever 4 is operated on the extension side, the lock pin 7 fits into a hole 8 formed in the lock lever 4 to prevent the lock lever 4 from sliding, that is, to lock the steering.

Note that 9 and 10 are limit switches that confirm the operating position of the lock pin 7 of the lock cylinder 6. When the steering is locked, one of the limit switches 9 comes into contact with the contact portion 11 formed at the other end of the piston rod 6A of the lock cylinder 6 and is turned ON. , the other limit switch 10 comes into contact with the contact portion 11 and turns on when the lock is released. If the steering lock is not released via these limit switches 9 and 10, the switching valve (not shown) for four-wheel and crab-leg steering will be in the neutral position (front two-wheel steering position).
The electrical circuit is configured in such a way that it cannot be switched from one to the other.

By the way, in such a steering lock device, limit switches 9 and 10 are attached to the axle 2, so if the axle 2 sinks into standing water or gets wet due to bad conditions at the construction site, for example, There was a concern that the electric system such as limit switches 9 and 10 would cause a failure such as an electric leak, making it impossible to confirm the operating position of the lock pin 7, and therefore, there was a problem in that the vehicle could not be driven in such areas.

(Purpose of the invention) The purpose of the invention is to solve these conventional problems.

(Structure of the invention) For this purpose, the present invention provides a steering lock device for a vehicle, which is equipped with a lock lever that is displaced as the wheels are steered, and a lock pin that is interlocked with a lock cylinder and restrains the operation of the lock lever when the steering is locked. The lock pin is attached to the axle and the lock cylinder is attached to the vehicle body above the axle, and the lock pin is elastically biased in the locking direction, and the lock pin and the lock cylinder are connected via a flexible wire device. Switch means are attached to the lock cylinder for interconnection and for confirming the operating position of the lock pin.

(Function) Based on the above configuration, the lock cylinder and electrical system are located on the vehicle body side above the axle, so failures due to flooding etc. do not occur, and the operating position of the lock pin can be confirmed, making the lock cylinder device easier to operate. and reliability is improved. In addition, the relative movement between the lock pin and lock cylinder that accompanies the vertical movement of the axle is absorbed by the flexible wire device, and the lock pin is elastically biased in the lock direction, so that the steering lock state is reliably maintained. Retained.

(Example) In Fig. 3, 1 is a rear wheel hydraulic cylinder (power cylinder), 4 is a lock lever, and the lock lever 4 has one end that rotates to one end of the steering knuckle 3 together with the piston rod of the hydraulic cylinder 1, as before. With the bracket 5 which is freely pin-coupled and whose other end is attached to the axle 2,
It is supported so as to slide as the hydraulic cylinder 1 expands and contracts.

A lock pin 12 is slidably attached to the bracket 5, and when the steering is locked, the lock pin 12 fits into the hole 8 of the lock lever 4 as shown in the figure, and prevents the lock lever 4 from sliding, while when the lock is released, as will be described later. lock cylinder 1
3, it is pulled upward in the figure and removed from the hole 8 of the lock lever 4.

14 is lock pin 1 in addition to lock lever 4
A guide member that guides the sliding of lock pin 1.
2 is formed with a flange 15 that abuts against the guide member 14 when the steering is locked and restricts further sliding (stroke).

Reference numeral 16 denotes a guide cylinder that guides the movement of the lock pin 12 via the collar 15. A spring 17 that biases the lock pin 12 toward the lock lever 4 is housed inside the guide cylinder 16.

18 is a spring holder that supports one end of the spring 17, and the spring holder 18 holds the lock pin 1 when the lock is released.
A stopper 19 is formed to restrict the stroke of 2.

On the other hand, the lock cylinder 13 is disposed in a portion of the vehicle body above the axle 2, as shown in FIG.

Inside the lock cylinder 13 is a piston 25.
It is divided into chambers A and B, and one chamber A is connected to an air reservoir tank (not shown) via an electromagnetic pilot type switching valve 20.

The switching valve 20 blocks the air pressure passage 22 during demagnetization, and when the lock switch 21 is turned on, it switches against the spring 23 as shown in the figure.
The air pressure passage 22 is communicated to send pressurized air into the chamber A of the lock cylinder 13.

The piston 25 of the lock cylinder 13 is connected to the lock pin 12 via a wire 24.

That is, when pressure is supplied to chamber A, the piston 25 of the lock cylinder 13 is pushed by the pressure and slides in a direction to contract the other chamber B, pushing the lock pin 12 against the spring 17 via the wire 24. On the other hand, when the pressure in chamber A is released to the atmosphere, the lock pin 12 is pushed down by the spring 17, causing chamber A to slide in the direction of contraction.

In this case, the stroke of the piston 25 is equal to the stroke of the lock pin 12.
The steering lock position is such that the flange 15 touches the guide member 14 and the lock pin 12 touches the spring receiver 18.
It is regulated within the range of the lock release position that hits the stopper 19.

On one side of the piston 25 is a rod 2 that turns on and off limit switches 26 and 27, which will be described later.
8 is provided protrudingly, and a diagonal cutout 34 is formed at the tip of the rod 28.

Limit switches 26 and 27 are lock pin 12
When the movable rod 29 rides on the circumferential surface of the rod 28 of the piston 25 and opens the contacts 31 and 32 against the spring 30, one switch 26 releases the lock. The indicator light 33 is turned off, but when the lock is locked, the movable rod 2 is turned off as the piston 25 slides.
When the relative position of the movable rod 9 moves from the circumferential surface of the rod 28 to the cutout 34, the movable rod 29 is pushed by the spring 30 and slides inside the cylinder 13 along the cutout 34, and the contact 31 and 32 is closed and the lock indicator light 33 is turned on.

Contrary to the above, the other limit switch 27 closes the contacts 37 and 38 when the movable rod 35 rides on the cut-off portion 34 of the rod 28 of the piston 25 and slides outside the cylinder 13 against the spring 36. When the lock is closed, the lock release indicator light 39 lights up, while when the lock is locked, when the movable rod 35 comes off the cutout 34 as the piston 25 slides, the contacts 37 and 38 are opened and the lock release indicator light 39 is turned on. Lights out.

In the figure, 40 is a tube that freely covers the wire 24, and 41 is the lock pin 12 and the wire 24.
The bolt 41 is connected to the wire 24 at one end, and a nut 42 is screwed to the other end passing through the axis of the lock pin 12 to prevent it from coming off. 43 is a support member that supports the end of the tube 40 on the spring receiver 18, and 44 is a bellows-shaped sealing member interposed between the tube 40 and the spring receiver 18. The tube 40 and the wire 24 passing through the tube constitute a flexible wire device. Both the tube 40 and the wire 24 have sufficient length to absorb the relative displacement between the axle and the vehicle body (in principle, the tube 40 is fully extended when the distance between the axle and the vehicle body is at its maximum). (It's good if it's long enough.) In this case, the wire 24 is inside and its operating path is restricted so that it moves forward and backward along the shape of the tube 40.
If both ends of the tube 40 are fixed to the axle side and the vehicle body side, one end side of the wire 24 (lock cylinder 1
3) Make sure that the forward and backward movement is on the other end (lock pin 12)
transmitted to. Furthermore, since the degree of bending of the tube 40 itself does not affect the advancing and retreating position of the wire 24, no matter how vigorously the axle moves up and down,
There is no fear that the lock pin 12 will stroke without permission.

Next, the operation based on such a configuration will be explained.

To lock the steering of the rear wheels when driving on a public road with front two-wheel steering, turn off the lock switch 21, the switching valve 20 switches, and the air pressure passage 2
2, and the pressure in chamber A of lock cylinder 13 is released to the atmosphere.

Along with this, the lock pin 12 is pushed by the spring 17 and slides until the flange 15 comes into contact with the guide member 14, and is fitted into the hole 8 of the lock lever 4 to prevent the lock lever 4 from sliding.

This prevents the rear wheel hydraulic cylinder 1 from expanding or contracting, and the steering is locked.

On the other hand, as the lock pin 12 slides, the piston 25 of the lock cylinder 13 slides from the unlocked position to the locked position. The limit switch 27 is turned OFF and the lock release indicator light 39 is turned off.
When the cutout portion 34 reaches the position of the movable rod 29, the limit switch 30 is turned on and the lock indicator light 33 is lit to notify that the steering is locked.

On the other hand, to release the rear wheel steering lock when performing four-wheel steering or crab-leg steering in the field,
All you need to do is insert the lock switch 21, in this case,
As the switching valve 20 is magnetized, the spring 23
The air pressure passage 22 is switched to communicate with the air pressure passage 22.

Along with this, pressure air is supplied from the air reservoir tank to the chamber A of the lock cylinder 13, and this pressure causes the piston 25 to slide in the direction of contracting the other chamber B while resisting the spring 17 to stop the lock pin 12. Pull it back to the position where it hits 19.

As a result, when the lock pin 12 is removed from the hole 8, the lock lever 4 becomes free to slide relative to the bracket 5, that is, the steering lock is released.

At this time, as the piston 25 slides, the movable rod 29 rides on the circumferential surface of the rod 28.
The limit switch 26 is turned OFF and the lock indicator light 33 is lit, while when the cut-off portion 34 of the rod 28 hits the movable rod 35, the limit switch 27 is turned ON and the lock release indicator light 39 is turned on.
lights up to let you know that the steering lock has been released.

By the way, in this case, the limit switches 26 and 27 are arranged together with the lock cylinder 13 in the part of the vehicle body above the axle 2, so even if the axle is submerged in standing water at a construction site, for example, there will be no risk of malfunctions such as electrical leakage caused by water in the electrical system. This can be avoided and the operating position of the lock pin 12 can be confirmed correctly.

Further, since the lock cylinder 13 is not covered with water or mud, good operability can be ensured.

Furthermore, since it is only necessary to attach the lock pin 12 to the axle 2, it is possible to improve the assembling efficiency, and there is also the advantage that there is no need for a space for attaching the lock cylinder 13.

(Structure and Effects of the Invention) As described above, in the present invention, the lock pin and the lock cylinder are separated, the lock pin is attached to the axle, and the lock cylinder is placed above the vehicle body than the axle, so that the lock cylinder can be remotely driven by the lock pin. At the same time, a limit switch is attached to the lock cylinder to check the operating position of the lock pin, which improves the operability of the lock cylinder, and even if the axle is submerged in standing water at a construction site, the limit switch and other electrical system The occurrence of malfunctions such as electrical leakage due to water is avoided, and the ability to travel at construction sites and during disasters is therefore greatly improved.

[Brief explanation of the drawing]

Figure 1 is a configuration diagram of the conventional device, and Figure 2 is its A-
3 is a sectional view of a portion of the device showing an embodiment of the present invention, and FIG. 4 is a configuration diagram of a portion of the device. 2... Axle, 4... Lock lever, 8...
Hole, 12... Lock pin, 13... Lock cylinder, 24... Wire, 26, 27... Limit switch.

Claims (1)

[Scope of utility model registration request] In a steering lock device for a vehicle, which is equipped with a lock lever that is displaced as the wheels are steered, and a lock pin that is interlocked with the lock cylinder and restrains the operation of the lock lever when the steering is locked, the lock pin is connected to the axle, and the lock cylinder is connected to the axle. Each is attached to the upper vehicle body, and the lock pin is elastically biased in the locking direction, and the lock pin and the lock cylinder are interconnected via a flexible wire device, and the operating position of the lock pin is confirmed. A steering lock device for a vehicle, characterized in that a switch means for locking the steering wheel is attached to a lock cylinder.