KR19980065585U - Steering shaft shock absorber structure of automobile - Google Patents

Abstract

The present invention discloses a steering shaft shock absorbing structure of an automobile. Disclosed is a cylinder 3 in which an oil 4 is sealed at a lower end of an upper steering shaft 2 on which a steering wheel 1 is mounted, and an oil passage 51 in the cylinder 3. The piston 5 is formed to be moveable, the lower steering shaft 6 is connected to the lower end of the piston 5, the lower steering shaft 6 is splined to the lower end of the cylinder (3) It features.

Description

Steering shaft shock absorber structure of automobile

The present invention relates to a fluid shock absorbing structure of an automobile steering shaft, and more particularly to a structure that is provided in a steering shaft for transmitting the steering force of the steering wheel to the wheel, to mitigate the impact energy due to the frontal collision with a fluid.

The operating mechanism that rotates the desired angle of the vehicle consists of a steering wheel, a steering shaft, and a steering column, and various safety mechanisms are employed to transmit the driver's operating force to the gear mechanism and promote driver safety. .

The steering shaft of the operating mechanism is a shaft that transmits the steering force of the steering wheel to the steering gear, and the steering wheel is mounted at the upper part and the steering gear is installed at the lower part. The connection method with a steering gear includes the method of connecting directly to a steering gear, and the method of connecting using a flexible joint.

In the case of using a flexible joint, the joint may be deformed to some extent in the torsion direction, thereby reducing the transmission of the impact on the steering wheel to the steering wheel.

The steering shaft is mounted in a state of inclination of 20 to 30 degrees in a passenger car. In addition, a safety device is mandated in the car to reduce the injuries caused by the driver falling forward due to inertia due to inertia and body bumping into the steering wheel.

One of these safety devices is a steering shaft equipped with a shock absorbing structure, the structure of which is outlined as follows.

The steering shaft embedded in the column cover is divided into two upper and lower steering shafts. In addition, the upper and lower steering shafts are spaced apart by a certain distance, and a tube is inserted therebetween, through which the operating force of the upper steering shaft is transmitted to the lower steering shaft. That is, the upper steering shaft is fitted to the upper end of the tube, while the lower steering shaft is fitted to the lower end of the tube and fixed with several pins. The lower steering shaft on the outside of the tube is provided with a steel ball.

With the above configuration, when the vehicle is subjected to a frontal collision, the impact is applied to the lower steering shaft. The lower steering shaft moves to the top of the tube, breaking the pin. The steel ball then enters the tube, scraping the inner circumferential surface of the tube. Finally, the upper end of the lower steering shaft collides with the lower end of the upper steering shaft.

That is, the impact transmitted from the lower steering shaft to the upper steering shaft is primarily reduced as the lower steering shaft breaks the pins, and secondly, as the steel ball scrapes through the inner circumferential surface of the tube. Therefore, even if the driver hits the steering wheel mounted on the upper steering shaft, it is not severely injured.

However, since the above-described conventional steering shaft shock absorbing structure is a system of absorbing shock only by mechanical deformation, it has been pointed out that the effect of absorbing impact energy is not excellent, and it has been a point of improvement.

Therefore, the present invention has been devised to improve the conventional steering shaft shock absorbing structure, the impact absorbing structure of the automotive steering shaft that can improve the impact energy reduction effect by reducing the impact energy by the fluid, not mechanical deformation. The purpose is to provide.

1 is a view showing a steering shaft shock absorbing structure according to the present invention

Explanation of symbols on the main parts of the drawings

1: steering wheel 2: upper steering shaft

3: cylinder 4: oil

5: piston 6: lower steering shaft

51: oil passage

In order to achieve the above object, the present invention provides a cylinder in which an oil is sealed at a lower end of an upper steering shaft in which a steering wheel is mounted at an upper end thereof, and a piston in which an oil passage is formed in the cylinder is movably fitted into the piston. A lower steering shaft is connected to the lower end of the lower steering shaft, characterized in that the spline coupled to the lower end of the cylinder.

According to the configuration of the present invention described above, the lower steering shaft is pushed back during the frontal collision, the piston is to compress the fluid, the fluid is slowly moved to the lower portion of the cylinder through the oil passage, so that the operation of the piston proceeds smoothly Thus, the impact energy is alleviated.

EXAMPLE

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

1 is a view showing a steering shaft shock absorbing structure according to the present invention.

For reference, in describing the configuration of the present embodiment, the same parts as in the prior art described at the beginning of the specification will be described mainly by omitting the repeated descriptions in order to avoid duplication of description.

As shown, a cylinder 3 is formed at the lower end of the upper steering shaft 2 on which the steering wheel 1 is mounted. In the cylinder 3, oil 4, which is a working fluid for mitigating impact energy, is enclosed. In addition, a piston 5 for compressing the oil 4 is movably inserted in the cylinder 3, and an oil passage for moving the compressed oil 4 to the lower part of the cylinder 3 in the piston 5. 51 is formed.

A lower steering shaft 6 is connected to the lower end of the piston 5, and the lower steering shaft 6 is moved along its axial direction at the lower end of the cylinder 3, but without relative rotation with respect to the cylinder 3. To be connected. In other words, the lower steering shaft 6 is splined to the cylinder 3.

Hereinafter, the operation of this embodiment configured as described above will be described in detail.

In the event of a frontal impact, the lower steering shaft 6 is pushed back, pushing the piston 5. The piston 5 moves to the top of the cylinder 3 to compress the oil 4, and the compressed oil 4 slowly moves through the oil passage 51 to the cylinder 3 below the piston 5. do. By this operation, impact energy is alleviated. Then, the piston 5, which is continuously pushed, collides with the upper end of the cylinder 3, and the impact is transmitted to the steering wheel 1 through the upper steering shaft 2. Since the impact energy transmitted to the steering wheel 1 is greatly relaxed by the action of the oil 4, the driver is not injured.

As described above, according to the present invention, since the impact energy due to the frontal collision is reduced to the oil 4 as a fluid, the effect of mitigating the impact energy is greatly improved. Therefore, in the case of a frontal collision, the degree of injury of the driver can be reduced.

On the other hand, the present invention is not limited to the specific preferred embodiment described above, anyone of ordinary skill in the art to which the present invention pertains without departing from the gist of the present invention claimed in the claims may be variously modified. will be.

Claims (1)

An oil-filled cylinder is formed at a lower end of an upper steering shaft having a steering wheel mounted at an upper end thereof, a piston having an oil passage formed therein is movably inserted therein, and a lower steering shaft is connected to a lower end of the piston, and the lower The steering shaft is a steering shaft shock absorbing structure of a vehicle, characterized in that the spline coupled to the lower end of the cylinder.