KR910008858Y1 - Steering shafts - Google Patents

Abstract

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Description

Vibration-absorbing steering shaft

1 is a partial cutaway view showing an embodiment of the present invention.

2 is a cross-sectional view taken along the line X-X of FIG.

3 is a structural perspective view showing a conventional steering mechanism example.

* Explanation of symbols for the main parts of the drawings

1: Joint Shaft 1a: One Side Joint Shaft

1b: other side joint shaft 2: active shaft

4: Hollow Tube 5: Shock Spring

6: long hole 7: connecting pin

C, C ': Universal Joint

The present invention relates to a steering shaft that connects a steering gear box from a steering wheel of a vehicle, and more particularly, a steering shaft for a front wheel drive vehicle connected to a steering gear box via a universal joint, and the steering shaft absorbs vibration. It is about.

The steering system of a vehicle is generally composed of an operation mechanism, a gear device, and a link mechanism. The operation mechanism includes a steering wheel, a steering shaft, and a protection device that prevents the driver from being injured by the steering wheel in the event of a collision.

The steering shaft of the steering system of the steering system is a part that transmits the steering train of the steering wheel to the steering gear, the upper part is connected to the handle, while the lower part is coupled to the steering gear. The column is rotatably supported while being covered with the outside by a column.

However, the above-described steering system structurally generates a shimmy phenomenon in which the steering wheel is shaken due to the resonance caused by the engine or the road impact during driving.

This phenomenon is pointed out as one of the things that need to be improved in the steering system because it makes the driver uncomfortable and easily fatigued.

As a method of suppressing the shimmy phenomenon, the flexible joint method has been put into practical use.

3 shows a flexible joint system that is generally used for front-wheel drive vehicles.

In this system, the steering shaft A is supported by the column B, and its lower end is connected to the steering gear D via some universal joints C and C '.

In this structure, the vibration transmitted from the engine or the road surface is absorbed by the universal joints C and C constituting the connection system between the steering shaft A and the steering gear D, and the steering shaft is further reduced. It is excellent in that it can correct errors in installation between and steering gear box.

However, in the all-wheel drive system that is mainly applied to small passenger cars, the rack-pinion steering gear box is adopted in which the impact of the road surface is transmitted to the steering wheel as it is. Otherwise, the vibration is so severe that the vibration absorption effect by the universal joint is less than expected.

It is an object of the present invention to provide a vibration absorbing steering shaft that can structurally completely absorb vibrations applied from an engine or a road surface even when applied to a front wheel drive vehicle in the above-described flexible joint steering shaft.

In order to achieve the above object, the present invention provides a steering shaft made of an expansion joint method having a universal joint installed at both ends, and a buffer spring interposed between the joints.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a partial cross-sectional view showing the configuration of the main part of the present invention, the same parts as in FIG. 3 are referred to by the same reference numerals.

In the present invention, the joint shaft (1) connecting between the universal joint (C) connected to the steering shaft (4) and the universal joint (C ') connected by the steering gear box (D) is a expansion joint divided into two Doing.

That is, one joint shaft 1a has the active tube 2 at the opposite end, and the other joint shaft 1b has the hollow tube 4 which inserts and connects the said active shaft 2 to it. . Before the active shaft 2 is inserted into the hollow tube 4, the hollow tube 4 is accommodated inside the buffer spring 5. In addition, on the outer circumference of the hollow tube 4, a pair of long holes 6 extending in the axial direction are formed in a symmetrical position, and through the long holes 6, as shown in FIG. The active shaft 2 is penetrated from the outer circumferential side, and both ends thereof protrude on the above-mentioned long hole 6.

This configuration allows the active shaft 2 to slide into an active stroke corresponding to the length of the long hole 6 inside the hollow tube 4, and is connected to the active shaft 2 by the connecting pin 7. The hollow tube 4 is capable of mutual torque transmission, and when the steering shaft A is rotated, the steering gear box D is also linked.

To make the torque transmission structure between the active shaft 2 and the hollow tube 4 more preferable, a spline connection may be performed between the active shaft 2 and the hollow tube 4.

In this case, even when the connecting pin 7 does not bear the load at the time of torque transmission, torque transmission can be performed more reliably.

According to the present invention configured as described above, the steering pieces through the steering are carried out from the steering shaft (A) via the universal joint (C) and the active shaft (2) and hollow tube (4) of both joint shafts (1a) and (1b). The mechanism transmitted to the steering gear box (D) is the same as the conventional steering system, but since the active shaft (2) can slide back and forth in the axial direction inside the hollow tube (4) from the engine or the road surface When the vibration is applied from the steering gear box (D) to the other joint shaft (1b), since the shock absorbing spring (5) and the active shaft (2) cooperatively absorb the vibration inside the hollow tube (4), the steering shaft Vibration is not transmitted until (A). Therefore, the present invention has an effect that can fundamentally solve the phenomenon of shimmy in all-wheel drive vehicle in which the vibration of the engine is severely transmitted to the steering wheel.

Claims (2)

In a steering apparatus in which a plurality of universal joints are interposed between a steering gear box and a steering shaft, a joint shaft (1) having universal joints (C) and (C ') attached to both ends thereof has an active shaft (2) at opposite ends. The joint joint 1a is formed into one joint shaft 1a and the other joint shaft 1b having a hollow tube 4 having a pair of long holes 6 drilled in the circumferential symmetrical direction thereof. A buffer spring 6 is interposed between the active shaft 2 and the hollow tube 4, and the connecting pin 7 penetrates through the circumferential direction of the active shaft 2 through the long hole 6. Vibration absorbing steering shaft, characterized in that configured to limit the active stroke of the shaft (2) to the length of the long hole (6). The vibration absorbing steering shaft according to claim 1, characterized in that a spline connection is formed between the active shaft (2) and the hollow tube (4).