JPH0735187A - Shock absorber structure - Google Patents

Abstract

PURPOSE:To provide a shock absorber structure which is able to prevent an elastic body from being damaged by impulsive rebound load. CONSTITUTION:This shock absorber structure is provided with both outer and inner cylinders 2 and 3 being fitted with each other, a piston part 5 being attached to a tip of a roll 4 installed on the same shaft in the outer cylinder 2 and sliding in the inner cyliner 3, a rebound stopper part 7 being attached to a tip part of the inner cylinder 3 and regulating any motion of the piston part 5, an elastic body 11 being attached to an opposed surface with the rebound stopper part 7 of the piston part 5 and coming into contact with this rebound stopper part 7, and a washer 12 installed in a backside of this elastic body 11. In addition, a flange part extending at the side of an outer circumferential surface of the elastic body 11 is installed in a peripheral edge of this washer 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shock absorber structure capable of preventing the cushion rubber as an elastic body from being deformed when a shocking rebound load is applied to the shock absorber.

[0002]

2. Description of the Related Art In two-wheeled vehicles and four-wheeled vehicles, various shock absorbers are used as suspension devices for wheels in order to prevent an impact applied to the wheels from being transmitted to the vehicle body.

4 and 5 show an example of a wheel suspension system used in a four-wheeled vehicle, in which a rear axle housing 102 of a rear axle shaft 101 for driving a wheel 100 is attached to a vehicle body frame 103. It is supported by the leaf spring 104 and the shock absorber 105.

FIG. 6 shows a twin-tube type shock absorber 105. The structure of the shock absorber 105 is such that the outer cylinder 10 fitted slidably with respect to each other.
6 and an inner cylinder 107, and a piston portion 109 that slides in the inner cylinder 107 is provided on a rod 108 provided on the axis of the outer cylinder 106. The inner cylinder 107 is composed of sealed double cylinders 107a and 107b, and the oil 110 is accommodated inside. The oil 110 accommodated on both sides of the piston portion 109 by opening and closing the valve of the piston portion 109. The inflow or outflow adjusts the damping force. In the extension stroke, the valve of the piston portion 109 is throttled to generate a damping force by making the piston upper chamber A a high pressure to generate a damping force, and at the same time, the oil corresponding to the volume of the rod 108 that has come out from the inside of the cylinder (tube) 107a is stored in the reservoir chamber 111. The valve 112 at the lower end is pushed open and flows into the cylinder 107a. Further, in the compression stroke, the valve of the piston portion 109 is lightly opened, and the oil 110 flows into the piston chamber A without resistance. Rod 10 inserted in cylinder 107a
The oil 110 corresponding to the volume of 8 flows to the reservoir chamber 111, and this flow is throttled by the valve 112 at the lower end, and the cylinder 107a
A high pressure is generated inside to generate a damping force.

FIG. 7 is a partially enlarged sectional view of the conventional shock absorber 105, in which the rod guide 113 as a rebound stopper is provided on the inner surface of the upper end of the inner cylinder 107.
A cushion rubber 115 is provided on the upper portion of the piston portion 109 via a washer 114 in order to soften the piston portion 109 from rising to the maximum and hitting the rod guide 113.

[0006]

However, according to the above-mentioned prior art, when the piston portion 109 hits the rod guide 113 as the rebound stopper, a shocking rebound load acts and the piston portion 109 is shown by the dotted line in the figure. The cushion rubber 115 may bulge and deform due to the flow of the oil 110 when flowing from the upper piston chamber A to the lower piston chamber B through the valve, and may be damaged (so-called galling).

An object of the present invention is to solve the above problems and to provide a shock absorber structure capable of preventing the elastic body from being damaged by an impact rebound load.

[0008]

In order to solve the above-mentioned problems, the present invention mounts the outer cylinder and the inner cylinder which are fitted to each other, and the tip of a rod provided coaxially in the outer cylinder, to the inner cylinder. The piston portion that slides inside, the rebound stopper portion that is mounted on the tip portion of the inner cylinder and that restricts the movement of the piston portion, and the rebound stopper portion that is mounted on the surface of the piston portion that faces the rebound stopper portion. It is provided with an elastic body that comes into contact with the portion and a washer provided on the back surface of the elastic body, and a flange portion that extends to the outer peripheral surface side of the elastic body is provided on the peripheral edge portion of the washer.

[0009]

The flange portion of the washer is provided on the outer peripheral surface of the cushion rubber when an impact rebound load is applied to the cushion rubber as an elastic body, so that the cushion rubber can be prevented from being deformed. . Further, since the protrusions that are pressed against the inner surface of the flange portion of the washer are provided at the peripheral edge portion of the cushion rubber, the rigidity of the cushion rubber can be improved.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. 1 and 2, reference numeral 1 denotes a twin-tube type shock absorber. The structure of the shock absorber 1 is composed of an outer cylinder 2 and an inner cylinder 3 which are slidably fitted to each other, and is arranged on the axis of the outer cylinder 2. A piston portion 5 that slides in the inner cylinder 3 is provided on the provided rod 4. The piston portion 5 is provided with a valve portion (not shown), and when the valve portion is opened and closed, the oil 6 stored on both sides of the piston portion 5 flows into or out of the upper chamber A and the lower chamber B to generate a damping force. I am trying to make adjustments. Inner cylinder 3
Is a rod guide 7 whose upper end is a rebound stopper, and double cylinders 3a, 3
The inside of the inner cylinder 3a is communicated with a reservoir chamber 10 provided between the cylinder 3a and the cylinder 3b by a valve 9 provided in the lower portion of the cylinder 3a.

As shown in FIG. 3, a cushion rubber 11 is provided as an elastic body on the upper portion of the piston portion 5 through a washer 12. The washer 12 has a peripheral edge portion on the outer peripheral surface side of the cushion rubber 11. A flange portion 12a extending to the bottom is provided.

On the other hand, at the peripheral edge portion of the cushion rubber 11, as shown in FIG. 3, the flange portion 1 of the washer 12 is provided.
By providing a protrusion 11a that comes into pressure contact with the inner surface of 2a, the rigidity of the cushion rubber 11 is improved.

According to the structure of the shock absorber having the above-mentioned structure, the operation of the shock absorber 1 causes the piston portion 5 to slide downward, and then the piston rubber 5 rises as a reaction thereto, and the cushion rubber 11 serves as a rebound stopper. Hit against. At this time, the cushion rubber 11 is compressed and crushes outward, but since the flange portion 12a of the washer 12 is provided outside the cushion rubber 11, deformation of the cushion rubber 11 is limited.
On the other hand, the action of the cushion rubber 11 bulging and deforming by the flow of the oil 6 when flowing from the piston upper chamber A to the piston lower chamber B through the valve of the piston portion 5 is also restricted by the flange portion 12a of the washer 12. It

Further, since the cushion rubber 11 is provided with the protrusion 11a at the peripheral edge, the rigidity is improved, and the protrusion 11a is pressed against the inner surface of the flange 12a of the washer 12 to deform the cushion rubber 11. Can be prevented.

[0015]

As described above, the shock absorber structure according to the present invention has the following effects. The outer cylinder and the inner cylinder which are fitted to each other, the piston portion mounted on the tip of a rod coaxially provided in the outer cylinder, and sliding in the inner cylinder, and the tip of the inner cylinder. A rebound stopper member that is mounted on a portion of the piston portion that restricts the movement of the piston portion, an elastic body that is attached to a surface of the piston portion that faces the rebound stopper member, and that is in contact with the rebound stopper member, and a rear surface of the elastic body. With the washer provided, the flange portion extending to the outer peripheral surface side of the elastic body is provided at the peripheral edge portion of the washer, so that when a shocking rebound load acts, the washer is attached to the outer peripheral surface of the elastic body. Since the flange is provided,
It is possible to prevent the elastic body from being deformed. Claim 2
In the above, since the protrusion that is in pressure contact with the inner surface of the flange portion of the washer is provided at the peripheral edge portion of the elastic body, the rigidity of the elastic body can be improved.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a shock absorber structure according to the present invention.

FIG. 2 is a partially enlarged sectional view of FIG.

FIG. 3 is a cross-sectional view showing a washer and a cushion rubber.

FIG. 4 is a side view showing an example of a suspension device for wheels used in a four-wheeled vehicle.

FIG. 5 is a partial cross-sectional view showing an example of a suspension device for a wheel used in a four-wheeled vehicle.

FIG. 6 is a partial sectional view showing a conventional shock absorber structure.

FIG. 7 is a partially enlarged sectional view of FIG.

[Explanation of symbols]

 1 Shock Absorber 2 Outer Cylinder 3 Inner Cylinder 4 Rod 5 Piston 6 Oil 7 Rod Guide 11 Cushion Rubber 12 Washer 11a Projection 12a Flange

Claims (2)

[Claims] 1. An outer cylinder and an inner cylinder which are fitted to each other, a piston part mounted on the tip of a rod provided coaxially in the outer cylinder, and sliding in the inner cylinder, and a tip of the inner cylinder. A rebound stopper member that is mounted on a portion of the piston portion that restricts the movement of the piston portion, an elastic body that is attached to a surface of the piston portion that faces the rebound stopper member, and that is in contact with the rebound stopper member, and a rear surface of the elastic body. A shock absorber structure comprising: a washer provided, and a flange portion extending to an outer peripheral surface side of the elastic body is provided at a peripheral portion of the washer. 2. The shock absorber structure according to claim 1, wherein the elastic body has a peripheral edge portion provided with a projection portion that comes into pressure contact with the inner surface of the flange portion of the washer.