KR20020051434A - Dust cover use in a shock absorber - Google Patents

Abstract

PURPOSE: A dust cover for a shock absorber is provided to prevent the surface of a piston rod from being damaged by restricting inflow of foreign matters to the shock absorber, and to lengthen a life span by improving endurance. CONSTITUTION: A dust cover(140) of a shock absorber is installed in the upper part of a piston rod, and arranged out of an external pipe to prevent dust or foreign matters from being moved into the external pipe. A bellows part(142) is formed in the upper part of a body(141), and a sill part(145) is formed in a fitting part(144). Plural ledges(146) are formed in the lower part of the sill part. A sealing cap(150) is mounted in the external pipe to insert the body, and spiral sliding grooves(152) are formed around the sealing cap. A step part(156) is formed in the lower part of the sealing cap to prevent displacement by fitting to the upper part of the ledge and the lower part of the step part. A fixing groove(154) is formed in the lower part of the step part to fasten the ledge. Inflow of foreign matters is prevented with installing the sealing cap in the dust cover.

Description

DU Dust cover of absorber {DUST COVER USE IN A SHOCK ABSORBER}

The present invention relates to a dust cover of a shock absorber, and more particularly, to a dust cover of a shock absorber which seals the open lower part of the dust cover to prevent the inflow of this material.

In general, shock absorbers are installed between the axle and the body to absorb vibrations or shocks received by the axle from the road surface to improve ride comfort. The interior is filled with fillers such as gas and oil. It is provided to increase the damping force, and oil-filled hydraulic shock absorbers are commonly used.

Usually, the shock absorber has an inner tube 20 and an outer tube 10 filled with oil therein as shown in FIG. 1, a portion of which is located inside the inner tube 20, and the other is located outside of the inner tube 20. Piston rod 30 which is installed to reciprocate in the longitudinal direction of the pipe 20, the piston valve 53 coupled to the front end of the piston rod 30, the lower end of the outer tube 10 and the piston rod The upper bracket 40 coupled to the upper end of the 30 and the lower part of the upper bracket 40 fastened to the upper end of the piston rod 30 to prevent foreign matter from penetrating the piston rod 50. It consists of the dust cover 13 which accommodated a part of (10).

However, such a conventional dust cover 13 is formed larger than the outer diameter of the outer tube 10 so that the smooth operation of the shock absorber 1 having an inner diameter covering the upper end of the outer tube 10 can be made and the lower end thereof. Is open, foreign matter penetrates into the gap, accumulates in the surrounding sealing portion of the piston rod 30, and eventually breaks or injuries and causes oil leakage or penetrates into the shock absorber, thereby degrading damping performance. .

The present invention is to solve the conventional problems as described above, to provide a dust cover of shock absorber provided with a sealing cap sealingly coupled to the dust cover at the bottom in order to prevent the inflow of foreign matter to the inside of the dust cover. The purpose is.

In order to achieve the above object, the present invention, in the dust cover of the shock absorber consisting of a cylindrical body of the top is blocked and the bottom is open; A stepped part and a locking step are formed in the lower part of the body, and a sliding groove in which the locking step is slidably moved in the lower part of the body, and fixed and downward of the locking step moved in accordance with the guide of the sliding groove. It provides a dust cover of the shock absorber, characterized in that the sealing cap having a fixing groove for preventing the separation, and a stepped portion fitted to the upper end of the locking step and the lower end of the stepped portion to prevent the separation upward.

1 is a cross-sectional view showing a dust cover of a conventional shock absorber.

Figure 2 is a perspective view of the dust cover of the shock absorber according to the present invention.

3 is a sectional view showing a dust cover of the shock absorber according to the present invention;

<Description of the code | symbol about the principal part of drawing>

100: shock absorber 110: outer tube

120: inner tube 130: piston rod

131: piston valve 140: dust cover

141: body 142: bellows

144: fitting portion 145: step

146: locking jaw 150: sealing cap

152: sliding groove 154: fixed groove

156: stepped portion 157: insertion hole

158: elastic contact piece

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

2 is a perspective view showing the dust cover of the shock absorber according to the present invention, Figure 3 is a cross-sectional view showing the dust cover of the shock absorber according to the present invention.

As shown in FIG. 2, the dust cover of the shock absorber according to the present invention includes an inner tube 120 filled with oil and oil outside the inner tube 120. About half filled outer tube 110, and one end is inserted into the inner tube 120 is installed to move up, down and the other end is provided with a piston rod 130 extending outward.

And the dust cover 140 is installed on the upper end of the piston rod 130. The dust cover 140 is disposed to the outside of the outer tube 110 to prevent foreign substances such as dust from penetrating into the outer tube 110, and a bellows portion 142 is formed on the upper portion of the body 141. The inside of the fitting portion 144 forming the lower portion of the cylindrical is formed with a stepped portion 145 having different inner diameters, the lower portion of the stepped portion 145 is composed of a plurality of locking step 146.

And the body 141 is inserted and fixed, the sealing cap 150 is installed on the outer tube 110, the number of spiral sliding grooves 152 corresponding to the locking step 146 is formed on the outer peripheral surface, The lower portion is formed with a stepped portion 156 having a stepped thickness of an outer diameter, and a closed cap 150 having an inclined and fine fixing groove 154 is provided at a lower end of the stepped portion 156. And the upper surface of the sealing cap 150, the outer hole 110 is inserted into the insertion hole 157 and the inner surface of the plurality of elastic to elastically contact with the outer peripheral surface of the outer tube 110 to prevent the infiltration of foreign matter The contact piece 158 is constructed.

Assembly of the dust cover of the shock absorber according to the present invention configured as described above is as follows.

The dust cover 140, which receives a portion of the outer tube 110 from above, is coupled to the sealing cap 150 that is press-fitted to the outer circumferential surface of the outer tube 110 as an elastic contact piece 158.

The coupling is located in the respective sliding grooves 152 of the sealing cap 150, the locking jaw 146 formed in the interior of the fitting portion 144 of the lower portion of the body 141 along the inclined groove body ( 141 is rotated downward to the stepped portion 156 along the sliding groove 152, and pushed downward and rotated once more at the lower end of the stepped portion 156 to be seated in the fixed groove 154 to escape downward. Will be prevented. On the other hand, when the locking jaw 146 is fitted into the fixing groove 154, the stepped portion 156 is inserted between the upper end of the locking jaw 146 and the stepped portion 145 to prevent the departure from upward. .

And the release is similarly pushed and turned by pushing the body 141 along the inclined surface of the stepped portion 156 is removed from the fixing groove 154 and pulled upward.

As such, the lower end of the dust cover 140 is blocked to block the inflow of foreign substances.

Although the present invention has been illustrated and described with respect to certain preferred embodiments, the present invention is not limited to the above-described embodiments, and a person skilled in the art to which the present invention pertains has the present invention set forth in the claims below. Various modifications may be made without departing from the spirit of the invention.

As described above, according to the dust cover of the shock absorber of the present invention, it is possible to prevent foreign material from entering the shock absorber to prevent damage to the surface layer of the piston rod, thereby improving durability as well as improving quality and increasing the service life. have.

Claims (3)

In the dust cover of the shock absorber consisting of a cylindrical body blocked at the top and open at the bottom; A stepped part and a locking step are formed in the lower part of the body, and a sliding groove in which the locking step is slidably moved in the lower part of the body, and fixed and downward of the locking step moved in accordance with the guide of the sliding groove. The dust cover of the shock absorber, characterized in that the sealing cap having a fixing groove for preventing the separation, and the stepped portion is inserted into the upper end of the locking step and the lower end of the stepped portion to prevent the separation upward. The method of claim 1, The sealing cap is made of a soft elastic member for hermetic coupling with the body, the dust cover of the shock absorber, characterized in that the insertion hole is formed so that the outer tube of the shock absorber is movable in the center thereof. The method of claim 1, Shock cover of the shock absorber, characterized in that the inner surface of the outer tube insertion hole formed in the sealing cap is formed in contact with the outer peripheral surface of the outer tube to prevent the infiltration of foreign matter.