JPH07238980A - Rebound spring mounting structure of hydraulic shock absorber - Google Patents

Abstract

PURPOSE:To prevent any offensive noise or impact due to a rebound spring of a hydraulic shock absorber from occurring as well as to make improvements in the assemblingness of a guide. CONSTITUTION:A flange member 11 is attached tight to the upper part of a piston 7 of a piston rod 6, while a rebound spring 17 pressed-in and installed with each of sectional L-shaped guides 15 and 16 at both ends is installed in an interval between a lower end face of a rod guide 5 and a top face of the flange member 11, whereby the upper guide 15 is fittingly installed on a peripheral surface of the piston rod 6 free of slide motion in letting it have a clearance, and the lower guide 16 pressed-in and clamped tight onto the peripheral surface of the piston rod 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure for a rebound spring arranged inside a hydraulic shock absorber used in a vehicle or the like.

[0002]

2. Description of the Related Art As a hydraulic shock absorber used in a vehicle or the like, as disclosed in Japanese Utility Model Publication No. 4-14835, guides having an L-shaped cross section are attached to both ends of a rebound spring. Both are slidably fitted on the outer peripheral surface of the piston rod.
As disclosed in JP-A-51469, a lower end of a rebound spring is attached to a guide that is hooked on a step portion of a piston rod and prevented from moving upward, and disclosed in JP-A-4-82441. As described above, there is known one in which the upper end side of the rebound spring is fixed to the rod guide and the lower end side is attached to a guide slidably fitted on the outer peripheral surface of the piston rod.

[0003]

In the above-mentioned mounting structures of the rebound spring of the hydraulic shock absorber, and in the structures thereof, since the lower guide is slidably fitted to the piston rod. The rebound spring may play and cause unpleasant noises or shocks. In the structure of, the processing and assembly are troublesome because the guide is fixed to the stepped portion of the piston rod.

[0004]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention mounts guides having an L-shaped cross section on both ends of a rebound spring, and among these guides, the upper guide is on the outer peripheral surface of the piston rod. It was slidably fitted, and the lower guide was press-fitted and fixed to the piston rod.

[0005]

[Function] Since the lower guide of the rebound spring is fixed to the piston rod, no unpleasant noise or shock is generated, and the lower guide is press-fitted and fixed to the piston rod to improve the assembling property. ..

[0006]

Embodiments of the present invention will be described below with reference to the accompanying drawings. Here, FIG. 1 is a sectional view of a hydraulic shock absorber to which the rebound spring mounting structure according to the present invention is applied, and FIG.
Is a cross-sectional view of the lower guide, FIG. 3 is a side view of the guide, and FIG.
FIG. 6 is a cross-sectional view of a main part of another embodiment of the present invention.

A damper cylinder 2 is erected in the outer tube 1, and a piston rod 6 inserted from above the outer tube 1 through an oil seal 4 held by a holder 3 and a rod guide 5 is placed inside the damper cylinder 2. No, a piston 7 which is in sliding contact with the inner peripheral surface of the damper cylinder 2 is fixed to the tip of the piston rod 6, and a damping force generating oil passage 8 is formed in the piston 7.

A flange member 11 is fixed above the piston 7 of the piston rod 6, and between the lower end surface of the rod guide 5 and the upper surface of the flange member 11, guides made of resin or the like having an L-shaped cross section are provided at both ends. A rebound spring 17 into which 15 and 16 are press-fitted is arranged.

Here, the upper guide 15 is slidably fitted to the outer peripheral surface of the piston rod 6 with a clearance, and the lower guide 16 is press-fitted and fixed to the outer peripheral surface of the piston rod 6. This lower guide 16 is shown in FIGS.
As shown in Fig. 5, there are several linear projections 18 having an arcuate cross section and extending in the axial direction on the inner peripheral surface (here, there are four, but there are three or five or more. May be formed) and is press-fitted and fixed to the outer peripheral surface of the piston rod 6.

As described above, the guides 15 and 16 having an L-shaped cross section are press-fitted into both ends of the rebound spring 17, and the upper guide 15 is slidably fitted on the outer peripheral surface of the piston rod 6, and the lower guide 15 is attached. Since the guide 16 is fixed to the outer peripheral surface of the piston rod 6, it is possible to prevent the lower end side of the rebound spring 17 from coming into contact with the flange member 11 and generating an unpleasant sound or impact.

Further, the lower guide 16 fixed to the outer peripheral surface of the piston rod 6 forms a linear protrusion 18 in the axial direction, and is fixed to the outer peripheral surface of the piston rod 6 in a line contact with a tightening margin. As a result, the surface pressure becomes high and the surface is securely fixed, and a large force is not required, and the assembling property becomes good.

Next, another embodiment shown in FIG. 4 is a flange member 1.
A rubber 20 and a washer 21 are interposed between the first guide 16 and the lower guide 16 to absorb a shock at the time of full extension.

The present invention is not limited to the above-described embodiment. For example, the protrusion formed on the inner peripheral surface of the lower guide 16 has a triangular cross section, and the tip of the triangular cross section is slightly different. It may be a trapezoidal one cut off.

[0014]

As described above, according to the present invention,
Guides having an L-shaped cross section were attached to both ends of the rebound spring, and an upper guide of these guides was slidably fitted on the outer peripheral surface of the piston rod, and a lower guide was press-fitted and fixed to the piston rod. Therefore, no unpleasant sound or impact is generated, and the assembling property of the lower guide is also improved.

Further, a substantially linear projection is formed on the inner peripheral surface of the lower guide in the axial direction of the piston rod, and the tip of this projection is press-fitted and fixed to the outer peripheral surface of the piston rod.
The lower guide is securely fixed to the piston rod.

[Brief description of drawings]

FIG. 1 is a sectional view of a hydraulic shock absorber to which a rebound spring mounting structure according to the present invention is applied.

FIG. 2 is a sectional view of a lower guide.

[Fig. 3] Side view of the guide

FIG. 4 is a cross-sectional view of an essential part of another embodiment of the present invention.

[Explanation of symbols]

1 ... Outer tube, 2 ... Damper cylinder, 6 ... Piston rod, 7 ... Piston, 11 ... Flange member, 15 ...
Upper guide, 16 ... Lower guide, 17 ... Rebound spring, 18 ... Projection.

Claims (2)

[Claims] 1. A hydraulic shock absorber having a rebound spring arranged therein, wherein guides having an L-shaped cross section are attached to both ends of the rebound spring, and the upper guide of these guides is the outer peripheral surface of the piston rod. A rebound spring mounting structure for a hydraulic shock absorber, wherein the lower guide is press-fitted and fixed to the piston rod. 2. The rebound spring mounting structure for a hydraulic shock absorber according to claim 1, wherein a substantially linear projection is formed on the inner peripheral surface of the lower guide in the axial direction of the piston rod. A rebound spring mounting structure for a hydraulic shock absorber, wherein a tip portion of the portion is press-fitted and fixed to an outer peripheral surface of a piston rod.