KR20180105487A - Cylinder cap for shock absorboer - Google Patents

Abstract

Provided is a cylinder cap for a shock absorber, allowing a bumper rubber to move on the same axis as a piston rod so as to prevent friction between the bumper rubber and the piston rod, thereby preventing a frictional noise with the piston rod and preventing foreign substances from being introduced into the cylinder cap via a through-hole of the cylinder cap, through which the piston rod can pass. The cylinder cap for a shock absorber comprises: a main body unit having a hole through which the piston rod of the shock absorber can pass; and a projection protruding upward from the upper surface of the main body unit around the circumference of the hole.

Description

Cylinder cap for shock absorber {CYLINDER CAP FOR SHOCK ABSORBOER}

The present invention relates to a cylinder cap for a shock absorber, and more particularly, to a cylinder cap for a shock absorber, more particularly, to prevent frictional noise with the piston rod by preventing the bumper rubber from moving on the same axis as the piston rod, The present invention relates to a cylinder cap for a shock absorber capable of restraining foreign matter from flowing into the cylinder cap through a through-hole of a cylinder cap passing therethrough.

Generally, a shock absorber is installed between an axle and a vehicle body, for example, a frame, and constitutes a suspension of the vehicle, and absorbs the vibration of the wheel generated during traveling. That is, the shock absorber absorbs vibrations and shocks transmitted from the road surface to the vehicle body, thereby improving the riding comfort of the driver and protecting the cargo and the vehicle itself.

An example of such a conventional shock absorber will be described with reference to FIGS. 1 and 2. FIG.

The shock absorber shown in Fig. 1 can be used as a part of the suspension in the front wheel of the vehicle, together with a coil spring not shown. The shock absorber 10 includes a cylinder 12 and a piston rod 14 having one end inserted into the cylinder 12 and the other end extended outward. The cylinder 12 may have a double pipe structure of an inner pipe 12a and an outer pipe 12b, and a working fluid is filled in the inner pipe 12a and the outer pipe 12b. An upper mounting bracket 31 for coupling with the vehicle body of the shock absorber 10 may be provided at the other end of the piston rod 14.

A piston valve 16 for generating a damping force is provided at one end of the piston rod 14 and the piston rod 14 is guided by a rod guide 18 provided at the upper end of the cylinder 12. An oil seal 19 is provided on the upper portion of the rod guide 18 to prevent leakage of oil and to block the inflow of external foreign matter. A cylinder cap 20 for protecting the inside of the cylinder 12 is press-fitted to the upper end of the cylinder 12.

A dust cover 30 for covering the upper portion of the cylinder 12 and preventing foreign matter from entering is mounted on the lower side of the mounting bracket 31 on the upper portion of the piston rod 14. In addition, the dumper cover 30 may be provided with a bumper rubber 35 which can contact the cylinder cap 20 when the shock absorber 10 is compressed and can buffer the shock.

Referring to Fig. 2, a perspective view of a conventional cylinder cap 20 is shown. The cylinder cap 20 has a body portion 22 formed with a hole 21 through which the piston rod 14 can pass and an extension portion 24 extending downward from the outer periphery of the body portion 22 . The extension portion 24 may be formed into a cylindrical shape corresponding to the shape of the cylinder and may be press-fitted into the outer tube 12b when the cylinder cap 20 is mounted on the upper end of the cylinder 12. [

When the conventional shock absorber 10 is compressed as described above, the bumper rubber 35 and the cylinder cap 20 collide with each other, resulting in compression of the bumper rubber 35. At this time, The bumper rubber 35 is eccentrically compressed in the cylinder cap 20 due to the behavior angle of the vehicle, as shown in the enlarged view of FIG. As a result, there is a problem that the bumper rubber 35 rubs or collides with the outer surface of the piston rod 14 to generate noise, which shortens the service life of the bumper rubber 35.

Further, there is a problem that foreign substances such as dust are introduced into the cylinder cap 20 through the hole 21 of the cylinder cap 20 into the cylinder cap 20.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problem, and it is an object of the present invention to provide a bumper rubber which prevents friction noise with a piston rod by preventing the bumper rubber from moving on the same axis as the piston rod, The present invention relates to a cylinder cap for a shock absorber capable of restraining foreign matter from flowing into the cylinder cap through a through-hole of a cylinder cap passing therethrough.

In order to achieve the above object, according to one aspect of the present invention, there is provided a cylinder cap for a shock absorber, comprising: a body portion having a hole through which a piston rod of the shock absorber passes; And a projection formed so as to protrude upward from the upper surface of the main body along the periphery of the hole.

The surface of the projection in the outward direction of the hole may be inclined so as to move away from the hole from the upper side to the lower side.

And an extension extending downward from an outer periphery of the body portion, wherein the extension can be press-fitted into the upper side of the cylinder of the shock absorber.

A groove extending radially from the hole may be formed on the upper surface of the body portion.

1 is a partially cutaway perspective view and a partial enlarged view of a general shock absorber,
2 is a perspective view of a conventional cylinder cap,
3 is a perspective view of a cylinder cap according to an embodiment of the present invention,
4 is a partial cross-sectional view and an enlarged view showing a state of use of the cylinder cap and the bumper rubber shown in Fig. 3 in a shock absorber.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings, and the advantages and features of the present invention and methods of achieving the same can be clearly understood.

It is to be understood that the present invention is not limited to the embodiments described below, but may be embodied in various forms other than those described in the following description without departing from the technical spirit of the present invention It will be apparent to those skilled in the art.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed and will become apparent to persons skilled in the art upon a reading of this disclosure. It is only defined by the claims.

On the other hand, well-known components, well known operations, and well-known techniques in some embodiments described below are not specifically described for the sake of brevity and for the sake of brevity.

It is also to be noted that like reference numerals refer to like elements throughout the specification and the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

In this specification, the singular forms include plural forms unless the context clearly dictates otherwise, and the constituents and acts referred to as " comprising (or having) " do not exclude the presence or addition of one or more other constituents and actions .

Unless defined otherwise, all terms (including technical and scientific terms) used herein may be used in a sense commonly understood by one of ordinary skill in the art to which this invention belongs.

Also, commonly used predefined terms are not ideally or excessively interpreted unless they are defined.

FIG. 3 is an upper perspective view of a cylinder cap according to an embodiment of the present invention, and FIG. 4 is a partial cross-sectional view showing a state of use of a cylinder cap and a bumper rubber shown in FIG. 3 in a shock absorber.

Since the shock absorber to which the cylinder cap 120 according to the embodiment of the present invention can be mounted has been described above with reference to Fig. 1, the detailed description is omitted for the sake of simplicity.

3, a cylinder cap 120 according to an embodiment of the present invention includes a body portion 22 in which a hole 21 through which a piston rod 14 (see Fig. 1) is formed, 21 protruding upward from the outer circumferential surface thereof. 4, when the bumper rubber 35 approaches the upper surface of the cylinder cap 120, the projections 29 are formed in the through holes 34 of the lower peripheral portion 33 of the bumper rubber 35, A part of the base 29 can be inserted. The upper projection 29 of the cylinder cap 120 can suppress the bumper rubber 35 moving toward the cylinder cap 120 from deviating from the axial direction of the piston rod 14 (see FIG. 4).

3 and 4, the surface of the projection 29 in the outward direction of the hole 29 is inclined so as to move away from the hole 21 toward the outer side from the upper side to the lower side, and the bumper rubber 35 The lower peripheral portion 33 of the bumper rubber 35 can be guided by this inclined surface when it is pressed toward the upper surface of the cylinder cap 20. The bumper rubber 35 can be guided along the axis of the piston rod 14 by the projection 29 of the cylinder cap 20 so that the friction or bump between the bumper rubber 35 and the piston rod 14 Can be prevented.

Since the protrusion 29 protruding upward is provided around the hole 21 of the cylinder cap 120, it is possible to suppress the foreign matter from flowing into the cylinder cap 120 through the hole 21 have.

The projections 29 may be made of the same material as the cylinder cap 120 or made of other materials. The projections 29 may be integrally formed with the cylinder cap 120 or may be separately manufactured and assembled with the body portion 22. [

Further, the cylinder cap 120 may further include an extension portion 24 extending downward along the outer periphery of the body portion 22. The extension portion 24 can be press-fitted into the upper end portion of the cylinder 12.

Further, on the upper surface of the body portion 22 of the cylinder cap 120, a discharge groove 37 for facilitating the discharge of foreign matter is radially formed.

3 and 4, the protrusion 29 of the cylinder cap 120 may be formed in a shape continuously connected along the hole 21, but an intermediate portion may be formed, which is a portion where the protrusion 29 is not present.

The protrusion 29 may have a shape in which the outer surface of the protrusion 29 is inclined away from the hole 21 as the outer surface is moved from the upper side to the lower side, or the inclined surface may have a convex or concave curved shape.

The bumper rubber 35 which is compressed into the cylinder cap 120 when the shock absorber is compressed is displaced from the axial line of the piston rod 14 by the vehicle behavior angle However, such a phenomenon can be suppressed by the protrusion 19 formed around the hole 21 of the cylinder cap 120 through which the piston rod 14 penetrates. Therefore, the bumper rubber 35 is prevented from colliding with or rubbing against the piston rod 14, noise is not generated, and the durability of the bumper rubber 35 can be improved.

A bell 19 is formed around the bore 21 of the cylinder cap 120 through which the piston rod 14 passes so that foreign matter is prevented from flowing into the cylinder cap 120 through the bore 21 . Thus, the durability of the shock absorber in which the cylinder cap 120 according to the embodiment of the present invention is used can be improved.

While the present invention has been described with reference to an embodiment thereof, it is to be understood that the present invention is not limited thereto and that various changes and modifications within the scope of the technical idea of the present invention as defined in the appended claims, It is noted that the described embodiments may be variously modified or modified by those skilled in the art.

10: Shock absorber
12: Cylinder
14: Piston rod
16: Piston valve
18: Road guide
19: Oil Seal
20; 120: cylinder cap
21: hole
22:
24: Extension
30: Dust cover
33: Lower periphery
34: Through hole
35: Bumper rubber

Claims (4)

In a cylinder cap for a shock absorber,
A body portion having a hole through which the piston rod of the shock absorber passes; And
And a projection formed so as to protrude upward from an upper surface of the main body along a periphery of the hole. The method according to claim 1,
And the surface of the projection in the outward direction of the hole is inclined so as to be away from the hole from the upper side to the lower side. The method according to claim 1,
Further comprising an extension extending downward from an outer periphery of the body portion, wherein the extension is press-fitted into the upper side of the cylinder of the shock absorber. The method according to claim 1,
And a groove extending radially from the hole is formed on an upper surface of the body portion.

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