JPH0131587Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to an improvement of a steering device for a vehicle steered by a power cylinder.

<Prior Art> As shown in FIG. 3, conventional steering devices of this type include a mechanical link mechanism 3 interposed between the front wheels 1 and a steering wheel 2 in order to steer the front wheels 1. power cylinder 5 to rear wheel 4
and the front 2 by the mechanical linkage 3.
In addition to wheel steering, the power cylinder 5
There are some that add wheel steering to enable four-wheel steering and crab-leg steering (for example, the
102568).

<Problems to be solved by the invention> By the way, in such a steering device,
The hydraulic power source (hydraulic pump) that supplies hydraulic pressure to the power cylinder 5 of the rear wheel 4 in response to steering wheel operation is driven in synchronization with the engine, so if a problem occurs with the engine, the rear wheel 4 will be activated. There may be cases where you become unable to cope with your situation. Furthermore, a similar problem occurs when trouble occurs in the hydraulic system.

As a result, there was a problem in that even if an attempt was made to tow it with another vehicle or move it manually, it would not be possible.

By the way, as shown in Japanese Utility Model Application Publication No. 57-121371, in a steering device for a vehicle having a rear wheel steered by a power cylinder, there is a means for mechanically locking the rear wheels so that they cannot be steered. There are some that have .

However, with this system, the rear wheels are first steered to the proper position using the power cylinder, and then the rear wheels are mechanically locked so that they cannot be steered, resulting in a malfunction in the steering system using the power cylinder. In this case, the rear wheels cannot be steered to an appropriate position and the rear wheels cannot be locked. Therefore, the above-mentioned problems still cannot be solved.

The present invention was developed in view of these conventional problems.When trouble occurs in the engine or hydraulic system, the rear wheels steered by the power cylinder are manually steered to the proper position. It is an object of the present invention to solve the above-mentioned conventional problems by providing a structure that can be locked so that steering cannot be performed.

<Means for solving the problem> For this reason, the present invention is designed to removably attach a link operation lever for performing steering operation by manual force to the rear wheel steering link, and to A connecting member is fixedly attached to each of the steering shafts and the steering shaft to be connected to each other and to disable steering of the rear wheels.

<Function> If the link operation lever is used to lock the rear wheels so that they cannot be steered after they have been steered to the neutral position, it becomes possible to tow it with another vehicle or to move it manually.

<Example> Hereinafter, an example of the present invention will be described based on FIGS. 1 and 2.

In FIG. 1, 6 and 7 are rear wheels, 8 is a rear axle, 9 is a tie rod, 10 is a tie rod arm, and 11 is a bar field joint.
The rear wheels 6 and 7 are steered by a single power cylinder 12, respectively. The base of the power cylinder 12 is rotatably pin-coupled to a bracket 13 fixed to the rear axle 8. Further, the tip of the piston rod 12A of the power cylinder 12 is rotatably pin-coupled to a bracket 14 fixed to the bar field joint 11 of the rear wheel 6. The power cylinder 12 is linked to an operation handle (not shown), expands and contracts with pressure oil supplied by a hydraulic pump (not shown), and is operated via a steering link consisting of the tie rod 9, tie rod arm 10, and bar field joint 11. rear wheel 6
Change the direction of and 7 integrally.

Here, a link operation lever 15 for performing a steering operation by manual force is detachably attached to the steering link.

That is, the bar field joint 11 of the rear wheel 7
A bracket 16 is fixed to. The opposite end of the bracket 16 extends toward the rear of the vehicle, and the proximal end of this part has an insertion hole 16a for a lock pin, which will be described later, and the distal end has a hexagonal hole 16a that serves as an attachment part for the link operating lever 15. Fitting holes 16b having a rectangular shape or a rectangular shape are respectively provided.
On the other hand, on one side of the tip of the link operation lever 15, as shown in FIG.
A hexagonal or square fitting protrusion 15a that fits into the fitting hole 16b of the fitting protrusion 1 is provided in a protruding manner.
5a has a threaded portion 15 on its outer periphery extending in the axial direction.
A bolt portion 15c having a diameter b is provided in a protruding manner. Therefore, the fitting protrusion 15a of the link operating lever 15
is fitted into the fitting hole 16b of the bracket 16, and the nut 19 is screwed into the bolt portion 15c and tightened.
It can be fixed at 6. On the other hand, a lock pin bracket 17 is fixedly attached to the end of the axle body 8a of the rear axle 8 on the rear wheel 7 side, which is bent into an L shape and extends in the direction of the rear wheel 7. A lock pin insertion hole 17a, which will be described later, is formed at the opposite end of the lock pin bracket 17.

Here, the insertion holes 16a and 17a of the bracket 16 and the lock pin bracket 17 are adapted to match each other when the rear wheels 6 and 7 are located at the neutral position, and in this state, the insertion holes 16a,
A lock pin 18 is provided which is inserted into the rear wheels 17a, connects the bracket 16 and the lock pin bracket 17, and locks the rear wheels 6,7. The lock pin bracket 17 and the bracket 16 are fixedly attached to the axle (axle body 8a) and steering shaft (bar field joint 11) of the rear wheel 7, respectively, and are connected to each other. The connecting member of the present invention is configured to make steering impossible.

In this configuration, if a problem occurs in the engine or the hydraulic system and the rear wheels 6, 7 become unable to be steered, the link operating lever 15 is fixed to the bracket 16 as described above. Then, by appropriately rotating this link operating lever 15, the directions of the rear wheels 6 and 7 are integrally changed via the steering link consisting of the tie rod 9, tie rod arm 10, and bar field joint 11. The wheels 6 and 7 are positioned at a neutral position steering state of 0 degrees. After that, when the rear wheels 6 and 7 are in the neutral position, the lock pin 18 is inserted into the matching insertion holes 16a and 17a, and the bracket 16 and the lock pin bracket 17 are connected to lock the rear wheels 6 and 7. . Incidentally, when the link operating lever 15 is not in use, it is stored in the trunk of the vehicle or the like.

Therefore, with this configuration, if the rear wheels 6 and 7 are manually steered to, for example, the neutral position using the link operating lever 15 and then locked so that they cannot be steered, the vehicle cannot be towed by another vehicle. This means that it can be moved by hand without any problems.

<Effects of the Invention> As explained above, according to the present invention, the rear wheels steered by the power cylinder are steered by manual force, and the engine Alternatively, if a problem occurs with the hydraulic system, by steering the rear wheels to a neutral position and then locking them so that they cannot be steered, the vehicle can be towed by another vehicle or moved safely by hand. This has great practical effects.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a rear wheel portion showing an embodiment of a steering device for a vehicle according to the present invention, and FIG. 2 is a diagram showing the detailed structure of a link operating lever in the same device, and A is a link operating lever. B is a side view of the installed state, B is a plan view of the link operation lever, 3rd
The figure is a schematic diagram showing a conventional example. 6, 7... Rear wheel, 8... Rear axle, 8a...
... Axle body, 9 ... Tie rod, 10 ... Tie rod arm, 11 ... Bar field joint, 12 ... Power cylinder, 15 ... Link operation lever, 15a ... Fitting protrusion, 15c ...
Bolt part, 16...Bracket, 17...Lock pin bracket, 19...Nut.

Claims (1)

[Scope of utility model registration request] In a steering device for a vehicle having a rear wheel steered by a power cylinder, a link operating lever for performing a steering operation by manual force is detachably attached to the steering link of the rear wheel. A steering device for a vehicle, characterized in that a connecting member is fixedly attached to the axle of the rear wheel and the steering shaft, respectively, and is connected to each other to disable steering of the rear wheel.