KR100791467B1 - Stopper structure of a shock absorber - Google Patents

Abstract

The present invention relates to a stopper structure of a shock absorber.

The present invention provides a shock absorber having a coil spring; A pre-piston fixedly installed at a lower end of the coil spring so as to be movable upward and downward, such as a compression and restoration operation of the coil spring at an upper part of the stopper, and having a plurality of vertically orifice bypass orifices formed therein; Characterized in that it comprises a configuration. Therefore, by installing the pre-piston fixed to the lower end of the coil spring, the stroke range is limited and the operating section is easily changed so that sufficient buffering force is obtained, thereby improving the riding comfort by improving the nonlinear cushioning performance when the piston rod is extended. .

Description

PERSTOPPER STRUCTURE OF A SHOCK ABSORBER}

1 is a cross-sectional view of a stopper structure of a shock absorber equipped with a conventional coil spring;

2 is a cross-sectional view showing a first embodiment of the stopper structure of the shock absorber according to the present invention;

3 is a cross-sectional view showing a second embodiment of the stopper structure of the shock absorber according to the present invention;

4 is a sectional view showing a third embodiment of the stopper structure of the shock absorber according to the present invention;

4A is a bottom view of the prepiston according to the third embodiment,

5 is a cross-sectional view showing a fourth embodiment of the stopper structure of the shock absorber according to the present invention;

6 is a sectional view showing a fifth embodiment of the stopper structure of the shock absorber according to the present invention;

7 is a sectional view showing a sixth embodiment of the stopper structure of the shock absorber according to the present invention;

Fig. 8 is a stage view showing a seventh embodiment of the stopper structure 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 124: groove (groove)

126: space 130: piston rod

140: rod guide assembly 150: stopper

151: coil spring 152, 168a, 172: slit

160: pre-piston 162: tofu (DU-BUSH)

164: bypass orifice 166: shock absorbing orifice

168: annular portion 170: multiple disk

180: shock absorbing member

The present invention relates to a stopper of a shock absorber, and more particularly, to a stop absorber structure of a shock absorber capable of effectively attenuating an impact at the maximum elongation of the shock absorber.

In general, a shock absorber for a vehicle is used to absorb and attenuate the natural vibration generated by the shock received by the spring when the vehicle travels to improve the riding comfort.                         

1 is a cross-sectional view showing a stopper of a shock absorber equipped with such a conventional coil spring. As shown therein, the conventional shock absorber 1 has an inner tube 20 filled with oil, an outer tube 10 filled with oil to the outside thereof, and one end is inserted into the inner tube 20. The other end is provided with a piston rod 30 extending to the outside of the outer tube (10).

The shock absorber 1 includes oil injected into both chambers of the piston valve 32 during rebound and compression stroke in which the piston rod 30 connected to the vehicle body is extended and relaxed upward and downward. The damping force characteristic required while moving to the lower side is obtained.

At this time, a cylindrical coil spring 52 is built between the stopper 50 and the rod guide assembly 40 inside the inner tube 20, and the piston rod 30 is made using the repulsive force of the coil spring 52. Has a function of improving roll characteristics at the time of turning by controlling the expansion to the upper side.

However, the shock absorber provided with the coil spring is compressed as the coil spring 52 moves upward when the piston spring 30 moves at the maximum extension with the one end fixed to the spring stopper 50. At the same time, the other end of the compressed coil spring 52 is brought into contact with the bottom surface of the rod guide 40 by elasticity. In the above process, there is a limit of stroke, and it is impossible to obtain the required cushioning force due to the narrow space. In addition, there is a problem that the buffer ratio is inadequate for the stopper characteristics that require a non-linear characteristic that is a second-order curve than the linear form a linear curve.

 SUMMARY OF THE INVENTION The present invention has been made to solve the conventional problems as described above, and has an object of providing a stop absorber structure of a shock absorber which has a low stroke constraint, a sufficient buffering force, and a buffer ratio having a nonlinear characteristic. .

In order to achieve the above object, the present invention provides a hollow outer tube, a hollow inner tube installed inside the outer tube, and one end of which is inserted into the inner tube and the other end of which extends outside the outer tube. A rod, an rod guide assembly installed at an upper end of the inner tube to support and guide the piston rod, a stopper installed at an outer periphery of the piston rod to control an extension of the upper side, and a cylindrical portion between the stopper and the rod guide assembly. In the shock absorber is provided with a coil spring of; A pre-piston fixedly installed at a lower end of the coil spring so as to be movable upward and downward, such as a compression and restoration operation of the coil spring at an upper portion of the stopper, and having a plurality of vertically orifice bypass holes; It provides a shock absorber structure of a shock absorber characterized in that the configuration comprising.

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

Figure 2 is a cross-sectional view showing a first embodiment of the stopper structure of the shock absorber according to the present invention, Figure 3 is a cross-sectional view showing a second embodiment of the stopper structure of the shock absorber according to the present invention, Figure 4 3 is a cross-sectional view showing a third embodiment of the stopper structure of the shock absorber according to the invention, FIG. 4A is a bottom view of the prepiston according to the third embodiment, and FIG. 5 is a fourth of the stopper structure of the shock absorber according to the present invention. 6 is a cross-sectional view showing a fifth embodiment of the stopper structure of the shock absorber according to the present invention, and FIG. 7 shows a sixth embodiment of the stopper structure of the shock absorber according to the present invention. 8 is a cross-sectional view showing a seventh embodiment of the stopper structure of the shock absorber according to the present invention.

The shock absorber stopper structure includes a shock absorber 100 having an inner tube 120 filled with oil, an outer tube 110 half filled with oil, and one end inserted into the inner tube 120. And the other end is provided with a piston rod 130 extending outside the outer tube (110). In addition, a rod guide assembly 140 installed at the upper end of the inner tube 120 to support the piston rod 130 and a stopper 150 for controlling the extension of the piston rod 130 to the outer periphery of the piston rod 130 are installed. In addition, a cylindrical coil spring 151 is installed between the stopper 150 and the rod guide assembly 140 to control the extension of the piston rod 130 to the upper side by using the repulsive force of the coil spring 151. .

As shown in FIG. 2, one end of the coil spring 151 is fixedly installed under the rod guide assembly 140, and one end of the coil spring 151 is fixed to the bottom of the stopper 150. The movable prepiston 160 is press-fitted and fixedly installed.

Pre-piston 160 is a disk having a thickness of the piston rod 130 is installed in the center, the outer peripheral surface is installed in close contact with the inner surface of the inner tube (120). In addition, it is preferable for a smooth operation to form a head bush (DUBUSH) 162 on the inner surface in close contact with the piston rod 130 and the outer circumferential surface in close contact with the inner tube 120.

In addition, a plurality of bypass orifices 164 vertically penetrated on the prepiston 160 are formed to allow the flow rate to pass.

In the second embodiment of FIG. 3, a plurality of shock absorbing orifices 166 are formed through the outer portion of the pre-piston 160, such as the bypass orifice 164.

In the third embodiment of FIG. 4, a plurality of annular portions 168 protruding downward from the lower surface of the pre-piston 160 are formed, and a plurality of the plurality of annular portions 168 control the flow rate passing through the bypass orifice 164. Two slits 168a are formed.

In the fourth embodiment of FIG. 5, an annular portion 168 protruding downward from the lower surface of the prepiston 160 is formed, and the flow rate passing through the bypass orifice 164 at the end of the outer circumferential surface of the stopper 150 is controlled. A plurality of slits 152 are formed.

In the fifth embodiment of FIG. 6, a groove 124 is formed in a predetermined section of the inner surface of the inner tube 120 that is in close contact with the prepiston 160 to form a space between the prepiston 160 and the inner tube 120. (126) was formed.

In the sixth embodiment of FIG. 7, the multi-disc disk 170 is forcibly inserted into or fixed to an outer circumferential surface of the stopper 150, and is fixedly installed by a separate fastening. A plurality of slits 172 for controlling the flow rate passing through are formed along the circumferential direction.

The seventh embodiment of FIG. 8 is equally applicable to each embodiment of the present invention, and the shock absorption of the rubber material that can absorb the shock on the upper portion of the coil spring 151 or the lower surface of the rod guide assembly 140. The member 180 is provided.

The action of the stopper structure of the shock absorber according to the present invention configured as described above is as follows.

 The stopper 150 has a function of improving roll characteristics at the time of turning by controlling the expansion of the piston rod 130 to the upper side by using the repulsive force of the coil spring 151 when the piston rod 130 is extended.

First, referring to FIG. 2, the pre-piston 160, which is easily changed in an operation section such as the compression and recovery operation of the coil spring 151, moves smoothly up and down as the head bush 162.

When the piston rod 130 is extended, the prepiston 160 moves upward while compressing the coil spring 151. At this time, the oil located at the top of the prepiston 160 passes through the bypass orifice 164. By controlling the extended piston rod 130 can be achieved a linear cushion.

In addition, when the piston rod 130 is fully extended, the stopper 150 collides with the pre-piston 160 to regulate the suspension action and reduce the impact.

In the second embodiment, the stopper 150 is in close contact with the pre-piston 160 which is operated together with the coil spring 151. In this case, the stopper 150 blocks the bypass orifice 164, but the oil flows through the shock absorbing orifice 166 to control the flow rate of the oil to absorb the shock.

In the third embodiment, when the stopper 150 in close contact with the prepiston 160 blocks the bypass orifice 164 as in the second embodiment, the oil passes through the slit 168a formed in the annular portion 168. do.

Unlike the third embodiment, when the stopper 150, which is in close contact with the annular portion 168 of the pre-piston 160, blocks the bypass orifice 164, the slit 152 of the stopper 150 is different. The oil passes through.

In the fifth embodiment, when the stopper 150 is in close contact with the annular portion 168 of the pre-piston 160 to block the bypass orifice 164, the groove portion 124 of the inner tube 120 is provided. The oil is passed through the space portion 126 formed as.

In the sixth embodiment, the oil passing through the bypass orifice 164 flows through the slit 172 of the multiple disk 170 of the stopper 150.

On the other hand, by installing the shock absorbing member 180 in each embodiment can further enhance the shock absorbing effect.

As such, the pre-piston 160 having the bypass orifice 164 on the top of the stopper 150 may control the flow rate of the oil passing through the bypass orifice 164 in the operating section to achieve nonlinear buffering.

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, the stopper structure of the shock absorber of the present invention is fixed at the lower end of the coil spring by installing a pre-piston at the lower end of the coil spring, in which the operating range is easily changed so that the stroke is limited and a sufficient buffering force is obtained. The nonlinear cushioning performance is improved, thereby improving the riding comfort.

Claims (8)

An outer tube provided in a hollow, a hollow inner tube installed inside the outer tube, a piston rod having one end inserted into the inner tube and the other end extending out of the outer tube, and supporting the piston rod A shock absorber provided with a rod guide assembly installed at an upper end of an inner tube, a stopper installed at an outer circumference of the piston rod to control an extension of the upper side, and a cylindrical coil spring between the stopper and the rod guide assembly; A pre-piston fixedly installed at a lower end of the coil spring so as to be movable upward and downward, such as a compression and restoration operation of the coil spring at an upper portion of the stopper, and having a plurality of bypass orifices vertically penetrated; Including; The pre-piston is a stopper structure of the shock absorber, characterized in that the DU-BUSH is installed on the inner surface in close contact with the piston rod and the outer peripheral surface in close contact with the inner tube. delete The method of claim 1, And a plurality of shock absorbing orifices penetrating through the outer portion of the bypass orifice on the pre-piston. The method of claim 1, An annular portion protruding downward from the lower surface of the pre-piston, and a plurality of slits for controlling the flow rate through the bypass orifice is formed in the annular portion, stopper structure of the shock absorber. The method of claim 1, An annular portion protruding downward from the lower surface of the pre-piston, and a plurality of slits for controlling the flow rate passing through the bypass orifice is formed at the end of the outer peripheral surface of the stopper. The method of claim 1, A stopper structure of the shock absorber, characterized in that a groove is formed in a predetermined section of the inner surface of the inner tube in close contact with the pre-piston to form a space portion on the outer circumferential surface of the pre-piston. The method of claim 1, A stopper structure of a shock absorber, comprising: a multi-plate disc fixed to an outer circumferential surface of the stopper and having a slit to control a flow rate through the bypass orifice. The method according to any one of claims 1 and 3 to 7, Shock absorbing member of the rubber absorber is installed on the upper portion of the coil spring or the upper surface of the stopper, the shock absorber structure characterized in that the shock absorber is installed.

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