KR100231996B1 - Shock absorbing structure for steering shaft - Google Patents

Abstract

The present invention is an operation mechanism for changing the direction of movement of the vehicle to any of the impact of the steering shaft including a lower shaft and the upper shaft and both ends are formed with a different diameter and the upper and lower shafts are inserted at each end The present invention relates to an absorption structure, and to improve the structure of the upper and lower shafts and pipes, while maintaining the conventional shock absorbing force as it is, and to improve the workability and productivity accordingly, the present invention, the lower shaft is A part of the tube to be inserted is provided with a narrower diameter toward the upper shaft, the lower shaft inserted into the tube is formed with a through hole formed integrally with the tube, through which the shock absorbing pin is inserted, In addition, the inside of the tube is spaced apart from the inserted lower shaft at a constant distance It provides a shock absorbing structure of a steering shaft characterized in that the ball is pressed in the diameter of the narrowing tube.

Description

Shock absorbing structure of the steering shaft

The present invention relates to a steering column shaft connected to a steering wheel, which is a vehicle steering apparatus, and more particularly, to a shock absorbing structure of a steering shaft formed to absorb shock from the outside.

In general, the steering device of a vehicle refers to a device for changing the traveling direction of the vehicle to an arbitrary, and is composed of three structures: an operation mechanism, a gear mechanism, and a link mechanism. First, the operation mechanism is a part which the driver directly steers and transmits the operation force to the gear mechanism, and is composed of a steering wheel, a steering column shaft, and the like. The gear mechanism is a gear mechanism fixed to the frame that increases the operating force by reducing the rotation of the steering shaft and at the same time changes the direction of movement of the operating mechanism to transmit to the link mechanism. Next, the link mechanism is a part that transmits the movement of the gear mechanism to the front wheel and at the same time maintains the relation position of the left and right wheels, and is composed of a pitman arm, a drag link, a knuckle arm, a tie rod, and the like.

Meanwhile, among the steering mechanisms, the steering column shaft, as described above, transmits the steering force of the steering wheel to the steering gear, and the steering wheel is provided at the top and the steering gear is installed at the bottom, and the impact from the outside is applied. In the case of losing, a part of the column tube is made in a net shape so that deformation occurs in the longitudinal direction to absorb shocks.

1 shows a perspective view of such a steering shaft 1.

As shown, the steering column shaft 1 comprises a lower shaft 2, an upper shaft 3 of larger diameter than the lower shaft 2, and each of these shafts 2, 3 having different diameters. It consists of a tube (4) that connects integrally, and both ends of the tube (4) connecting the lower shaft (2) and the upper shaft (3) to each other are formed to have a different diameter and such a tube ( The shafts 2 and 3 are inserted at both ends of 4) so as to be spaced apart from each other. In addition, two polyacetal pins 5 are inserted through the tube 4 at the insertion end of the lower shaft 2 to support the tube 4 and the lower shaft 2 in a coupled state. On the free end of the lower shaft 2, a steel ball 6 is inserted with a part protruding outward of the shaft 2.

On the other hand, the upper and lower shafts 3 and 2 and the tube 4 are inserted outside the first and second shafts 7 and 8 of another tubular shape so as to surround the upper and lower shafts 3 and 2. 2) and the tube 4 are to be protected.

3 is a cross-sectional view of the tube 4 in which the upper and lower shafts 3 and 2 are inserted, the outer portion of the tube 4 and the inner dotted line of the lower shaft 2, respectively. And the space portion formed between the lower shaft 2 is a space portion in a state viewed from the upper shaft 3 side.

Due to this configuration, the lower shaft 2 is first impacted in the event of a collision of the vehicle body such as a frontal collision of the vehicle, and the impact is the two poly acetal pins 5 joining the tube 4 and the lower shaft 2. ) Is absorbed primarily while breaking, and the lower shaft 2, which is subsequently inserted into the inside of the tube 4, is rubbed with the inner surface of the tube 4 while the steel ball 6 protrudingly inserted into the outer end thereof. In this case, plastic deformation occurs at the contact portion of the tube 4, and the second absorption is performed again.

By the way, in the structure of such a conventional steering shaft, as shown in FIG. 2, the respective upper, lower shafts 3 and 2 and the tube 4 are formed in an approximately elliptical shape, and the tube 4 Since a through hole for mounting the polyacetal pin 5 is to be provided at the side portion of the), there is a problem in that workability is difficult and productivity is lowered.

Therefore, the present invention has been proposed to solve such a conventional problem, by improving the structure of the steering shaft to improve the structure of the upper and lower shafts and pipes, while maintaining the conventional shock absorbing force as it is and workability and accordingly It aims at improving productivity.

1 is a side cross-sectional view showing a steering shaft structure of a conventional vehicle.

2 is a cross-sectional view of FIG.

3 is a side cross-sectional view showing the structure of a steering shaft according to the present invention.

* Explanation of symbols for main parts of the drawings

1: steering column 2: lower shaft

3: upper shaft 4: tube

5: polyacetal pin 6: steel ball

7: 1st axis 8: 2nd axis

In order to achieve the above object, the present invention, the operation mechanism for changing the direction of movement of the vehicle to any arbitrary lower shaft and upper shaft and both ends are formed to have a different diameter so that the upper and lower shafts are inserted at each end A shock absorbing structure of a steering shaft including a tube, wherein a part of the tube into which the lower shaft is inserted is provided with a narrower diameter toward the upper shaft, and the lower shaft inserted into the tube is formed with a through hole integrally formed with the tube. A shock absorbing pin is inserted through the through hole, and the inside of the tube is steered in the diameter portion of the tube in which the ball is narrowed at a predetermined distance from the inserted lower shaft. Provides a shock absorbing structure of the shaft.

It is also preferred that the shock absorbing pins on the boundary of the tube and the lower shaft are provided with notches in the opposite direction in which the lower shaft is inserted such that these pins can break when the lower shaft is inserted.

EXAMPLE

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention, the same reference numerals are assigned to the same parts as those cited in the prior art, in the present embodiment, to avoid duplication of description again Do not explain.

3 is a side cross-sectional view showing the structure of a steering shaft according to the present invention.

First, as shown in FIG. 3, according to the present invention, a part of the tube 4 into which the lower shaft 2 is inserted is provided with a narrower diameter toward the upper shaft 3, and also the tube 4 The lower shaft 2 inserted therein is formed with a through hole integrally formed with the tube 4, through which the shock absorbing pin 9 is inserted. On the other hand, the shock absorbing pin 9 on the boundary between the tube 4 and the lower shaft 2 is provided with a notch 10 in the opposite direction in which the lower shaft 2 is inserted to insert the lower shaft 2. This pin 9 is to be broken at the time.

Further, according to the present invention, the inside of the tube 4 is pressed into the diameter portion of the tube 4 in which the ball 11 narrows in a state spaced apart from the inserted lower shaft 2 by a predetermined distance.

By this configuration, when an impact is applied to the lower shaft 2, the shock absorbing pin 9 is broken while the lower shaft 2 is inserted into the tube 4, and the shock is absorbed primarily. Subsequently, the lower shaft 2, which is inserted into the tube 4, presses the ball 11 into the small diameter portion of the tube 4 in contact with the ball 11, thereby allowing the tube 4 and the ball ( 11) is transformed to absorb the shock secondary.

As described above, according to the shock absorbing structure of the steering shaft according to the present invention, by changing the diameter of the tube into which the upper shaft and the lower shaft of the steering shaft is inserted, the lower shaft inserted into the tube by the impact from the outside The workability and productivity of the steering shaft can be improved by absorbing the impact of the steering shaft. Furthermore, the appearance of each of the upper shaft, the lower shaft, and the pipe is formed in a spline shape to increase the contact area between each other. This has the effect of increasing.

On the other hand, the present invention is not limited to the above-described specific preferred embodiment, and any person having ordinary knowledge in the field to which the present invention belongs without departing from the gist of the present invention claimed in the claims. Would be possible.

Claims (2)

As an operation mechanism for changing the direction of movement of the vehicle to an arbitrary, as a shock absorbing structure of the steering shaft including a tube which is formed so that the lower shaft and the upper shaft and both ends have different diameters, the upper and lower shafts are inserted at each end. The part of the tube into which the lower shaft is inserted is provided with a narrower diameter toward the upper shaft, and the lower shaft inserted into the tube is formed with a through hole integrally formed with the tube. The shock absorbing structure of the steering shaft which is inserted and is pressed in the diameter part of the tube which narrows the ball in the state spaced apart by the fixed distance from the lower shaft inserted in the inside of the tube. 2. The steering according to claim 1, wherein the shock absorbing pin on the boundary between the tube and the lower shaft is provided with a notch in the opposite direction in which the lower shaft is inserted such that the pin can break when the lower shaft is inserted. Shock absorbing structure of the shaft.

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