KR20080086168A - Bumper rubber of a shock absorber - Google Patents

Abstract

A bumper rubber of a shock absorber is provided to reduce a noise caused by friction between a cylinder and a cam when the bumper rubber is deformed by forming protrusions having different heights at a bottom surface of the bumper rubber. A bumper rubber of a shock absorber comprises a cylinder, a piston and a piston rod reciprocating in the cylinder to generate a damping force, and a bumper rubber(10) installed at the piston rod to prevent the cylinder from being collided with the vehicle body. A concave-convex portion is formed with a through hole(11) into which the piston rod is inserted. The bumper rubber is provided at the bottom surface thereof facing toward the cylinder with a plurality of protrusions having heights different from each other. The protrusions includes a first protrusion(13) having a higher height and a second protrusion(15) having a lower height than the first protrusion.

Description

Bumper rubber of shock absorber {BUMPER RUBBER OF A SHOCK ABSORBER}

1 is a cross-sectional view showing an example of a shock absorber with a bumper rubber according to the prior art;

Figure 2 is a view showing another example of the bumper rubber according to the prior art, (a) is a bottom view and (b) is a main part side view,

3 is a view showing a bumper rubber according to the present invention, where (a) is a bottom view and (b) is a main part side view.

<Brief Description of Major Codes in Drawings>

10 bumper rubber 11: through hole

13: 1st projection 15: 2nd projection

The present invention relates to a shock absorber, and more particularly, to a bumper rubber of a shock absorber capable of preventing noise generation due to friction between the cap of the cylinder during compression deformation.

The shock absorber serves to suppress and attenuate the vibration transmitted from the road surface to the vehicle body of the vehicle being driven, and in particular, by absorbing the up and down vibration energy of the vehicle body, improving the riding comfort, protecting the loaded cargo, and protecting each component of the vehicle. Contribute to protection

The shock absorber typically includes a cylinder, a piston slidably received within the cylinder, and a piston rod extending out of the cylinder while being connected to the piston. When such a conventional shock absorber is installed in a vehicle, the cylinder is generally fixed to the axle or wheel side and the piston rod is fixed to the vehicle body side.

The shock absorber may function to attenuate and mitigate vibrations and shocks transmitted from the road surface to the vehicle body while repeatedly compressing and rebounding the road when the vehicle travels on the road surface.

Figure 1 shows an example of a conventional shock absorber that performs this function. As shown in Fig. 1, the conventional shock absorber has a cylinder 101 and a piston 102 and a piston rod 103 which generate a damping force by linearly moving in the cylinder 101. The piston rod 103 extends from the inside of the cylinder 101 to the outside, and the piston 102 is provided at the inner end of the cylinder of the piston rod 103, and the outer end of the cylinder is usually fixed to the vehicle body side.

At this time, the bumper rubber 110 is attached to the cylinder outer end of the piston rod 103 fixed to the vehicle body side, so that when the shock absorber is completely compressed, the upper end of the cylinder 101, that is, the cap member 105 is connected to the vehicle body side. Avoid direct contact and collisions.

Due to the conventional bumper rubber 110 shown in FIG. 1, it was possible to prevent the upper end of the cylinder 101 directly colliding to the vehicle body side when the shock absorber was completely compressed, that is, contracted, but the bumper rubber 110 While the entire lower surface of the cylinder 101 is in contact with the cap member 105 of the upper end there was a problem that a large noise and shock occurs.

In order to solve this problem, as shown in FIG. 2, the through hole is formed on the lower surface of the bumper rubber 120 made of urethane or rubber in which the through hole 121 into which the piston rod 103 is fitted is formed at the center thereof. It has been proposed that the plurality of protrusions 123 are arranged around the center 121.

However, since the conventional bumper rubber 120 has a plurality of protrusions 123 arranged at regular intervals on a flat lower surface, the bumper rubber 120 is deformed as the shock absorber is extended and compressed. The flat upper surface of the bumper rubber 120, in which the 123 is not formed, rubs with the cap member 105, causing noise.

The present invention is to solve these problems, the object of the present invention, by providing a plurality of projections of different heights on the lower surface to prevent noise caused by friction between the cap of the cylinder during compression deformation. It is to provide a bumper rubber of a shock absorber.

According to the present invention for achieving the above object, a cylinder, a piston and a piston rod for generating a damping force by linearly moving in the cylinder, and a bumper provided on the piston rod to prevent the cylinder from colliding with the vehicle body side In the shock absorber including the rubber, a bumper rubber of the shock absorber is provided on a lower surface, which is a surface facing the cylinder of the bumper rubber, in which a plurality of protrusions having different heights are formed to form a multi-stage structure.

Here, it is preferable that the said some processus | protrusion has a cone shape or a polygonal pyramid shape.

Moreover, it is preferable that the said some processus | protrusion consists of the 1st high processus | protrusion and the 2nd processus | protrusion lower than the said 1st processus, and have a two-stage structure.

Preferably, the first and second protrusions are alternately arranged on the lower surface of the bumper rubber along the circumferential direction.

Hereinafter, a bumper rubber of a shock absorber according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. 3 shows a bumper rubber according to the present invention, in which (a) a bottom view is shown and in (b) a main part side view is shown.

The shock absorber having the bumper rubber 10 according to the present invention is, as in the prior art, a cylinder 101 forming the outer shape of the shock absorber and a piston 102 which generates a damping force by linearly moving in the cylinder 101. And a bumper rubber 10 provided on the piston rod 103 to prevent the piston rod 103 and the cylinder 101 from colliding with the vehicle body side. The dust cover 104 may be provided on the outer side of the cylinder 101 as in the prior art. (See Fig. 1).

As shown in FIG. 3, a through hole 11 (see FIG. 3A) is formed at the center of the bumper rubber 10 according to the present invention for fitting a piston rod.

In addition, the bumper rubber 10 has an upper surface in contact with a fixing part such as a mounting bracket fixedly coupled to the vehicle body side, and a lower surface facing the cap member 105 which is the upper end of the cylinder 101.

As shown in FIG. 3, a plurality of first and second protrusions 13 and 15 are integrally formed on the lower surface of the bumper rubber 10 according to the present invention. The first protrusion 13 and the second protrusion 15 have a substantially square pyramid shape as shown in FIG. 3 (a), and the first protrusion 13 of the first protrusion 13 as shown in FIG. The height is higher than the height of the second protrusion 15.

In this way, the first projection 13 and the second projection 15 having different heights are alternately arranged along the circumferential direction on the lower surface of the bumper rubber 10, and have a two-stage structure as a whole.

That is, when the bumper rubber 10 contacts the cap member 105 of the upper end of the cylinder, the first protrusion 13 having a high height is first contacted and the second protrusion 15 having a low height is contacted to disperse the impact. You can.

In addition, since the area of the lower surface that remains flat compared to the prior art is significantly reduced, noise generated when the flat portion without protrusions rubs against the cap member during deformation of the bumper rubber 10 can be reduced.

Meanwhile, although the first and second protrusions 13 and 15 are illustrated as having a quadrangular pyramid shape in FIG. 3, the first and second protrusions 13 and 15 may have a polygonal pyramidal shape such as a cone or a triangular pyramid. In addition, the inclination angles of the first and second protrusions 13 and 15 may be made to have all surfaces having the same angle, and some surfaces may be made to have different angles.

In addition, although the first and second protrusions 13 and 15 have different heights from each other in FIG. 3 and have a two-stage structure as a whole, the third or fourth protrusions (not shown) having different heights from each other are illustrated. It is also possible to have a multi-stage structure such as three-stage or four-stage by utilizing such.

The bumper rubber according to the present invention may be mounted on all other types of shock absorbers such as a mono tube type shock absorber in addition to the shock absorber of the type shown in FIG. 1.

As described above, the bumper rubber of the shock absorber according to the present invention has been described with reference to the illustrated drawings, but the present invention is not limited to the embodiments and drawings described above, and the present invention belongs to the claims. Of course, various modifications and variations can be made by those skilled in the art.

According to the present invention as described above, there is provided a bumper rubber of the shock absorber that can provide a plurality of projections of different heights on the lower surface to prevent the occurrence of noise due to friction between the cap of the cylinder during compression deformation.

Claims (4)

A shock absorber comprising a cylinder, a piston and a piston rod for generating a damping force by linearly moving in the cylinder, and a bumper rubber provided on the piston rod to prevent the cylinder from colliding with the vehicle body side. A bumper rubber of the shock absorber, characterized in that a plurality of protrusions having different heights are formed on a lower surface, which is a surface facing the cylinder of the bumper rubber, to form a multi-stage structure. The method according to claim 1, The bumper rubber of the shock absorber, characterized in that the plurality of projections have any one shape selected from cone and polygonal shape. The method according to claim 1 or 2, The bumper rubber of the shock absorber according to claim 1, wherein the plurality of protrusions comprise a first protrusion having a high height and a second protrusion having a lower height than the first protrusion. The method according to claim 3, The bumper rubber of the shock absorber, wherein the first and second protrusions are alternately arranged on the lower surface of the bumper rubber along the circumferential direction.

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