JP2591103Y2 - Cylinder fixing structure for shock absorber - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for fixing a cylinder of a shock absorber used for a vehicle or the like, and more particularly to a structure for preventing a screw-in type cylinder from being loosened.

[0002]

2. Description of the Related Art As a shock absorber used for a vehicle or the like, Japanese Utility Model 5
As disclosed in Japanese Patent Application Publication No. 9546, there is known a cylinder screw-in type in which a screw is formed on the outer periphery of a pipe-shaped cylinder, and the cylinder is screwed to a cylindrical mounting portion of a tank body. Conventionally, in such a shock absorber, as shown in FIG. 4, the cylinder mounting portion 101 of the tank body and the cylinder 102 are connected to each other in order to prevent the cylinder from being loosened and falling off with respect to the cylindrical mounting portion. It is connected with a set screw 103 from the outside, or a lock nut is used.

[0003]

In a structure in which a cylinder is fixed with a set screw or a lock nut as in the above-mentioned conventional shock absorber, when the set screw or the lock nut is loosened due to vibration of the shock absorber, etc. However, there is a possibility that the cylinder may be loosened from the mounting portion and fall off, or the set screw may cause deformation of the cylinder, so that the stroke of the piston may not be able to be increased.

[0004]

According to the present invention, a collar is fitted around the outer periphery of a cylinder, and a spring seat for supporting one end of a suspension spring is rotatably provided on the outer periphery of the collar. Furthermore, a detent means is provided between the lid member and the collar, and a step portion is formed on the inner peripheral surface of the collar,
A stopper member is provided on the outer peripheral surface of the cylinder to be locked at the step of the collar.

[0005]

The collar fitted to the outer periphery of the cylinder is pressed against the lid member by the restoring force of the suspension spring and does not rotate with respect to the lid member by the rotation preventing means. Since the release member locked by the part is provided, when the cylinder is loosened with respect to the lid member, the stopper member fitted to the outer periphery of the cylinder is locked by the step on the inner peripheral surface of the collar. The cylinder will rotate any further
Therefore , the cylinder does not come off from the lid member.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the accompanying drawings. Here, FIG. 1 is a half sectional view of a shock absorber to which the cylinder fixing structure according to the present invention is applied, FIG. 2 is a sectional view of a main part of the shock absorber, and FIG. 3 is a front view of a main part of the shock absorber.

In FIG . 1, a cap 2, a rod guide 3, and an oil seal 4 are provided in a cylinder 1 from one end opening side.
A hollow rod 6 as a piston rod is inserted through a rebound rubber 5 and the like. At the upper end of the hollow rod 6, a piston 7 which is in sliding contact with the inner peripheral surface of the cylinder 1 is mounted, and an oil passage 8 for generating damping force and an oil passage (not shown) are formed in the piston 7, and these oil passages 8 are formed. A valve 9 for opening and closing and a valve 10 for opening and closing an oil passage (not shown) are mounted.

An axle mounting member 12 for mounting an axle is mounted on the lower end of the hollow rod 6, and a spring seat 13 is disposed above the axle mounting member 12.
A stop bar 14 is mounted on the spring seat 13. On the other hand, the other end opening side of the cylinder 1 is a lid member 1.
6, a sub-tank 18 is connected to a connecting portion 17 of the lid member 16, and a vehicle body mounting portion 19 for mounting on the vehicle body side is integrally formed.

In FIG . 2, a collar 20 is fitted around the upper end of the cylinder 1 and a screw 2 is fitted around the collar 20.
1 and a spring seat 22 is screwed onto the screw 21 and locked by a lock nut 23. The spring seat 22 and the spring seat 13 (FIG. 1)
) Is interposed between the suspension spring 24 and the suspension spring 24.

In FIG . 3, a projection 26 is integrally formed on the lower end surface side of the lid member 16 and a notch 27 with which the projection 26 of the lid member 16 is engaged is formed on the upper end side of the collar 20. The protrusion 26 and the notch 27 constitute a rotation preventing means for restricting the rotation of the collar 20 with respect to the lid member 16.

Further, in FIG. 2, a stepped portion is formed on the inner peripheral surface of the collar 20 by forming an enlarged diameter portion 28 on the inner peripheral surface of the end of the collar 20 on the lid member 16 side. A stopper ring 29, which is a retaining member that is locked at a step portion at the end of the enlarged diameter portion 28 of 20, is fitted.
The retaining member is not limited to the stopper ring 29.

In the shock absorber constructed as described above,
The collar 20 fitted on the outer periphery of the cylinder 1 is pressed against the lid member 16 by the restoring force of the suspension spring 24, and the projection 26 of the lid member 16 (see FIG. 3) and the notch 27 of the collar 20 (see FIG. 3). Are engaged, the collar 20 cannot rotate with respect to the lid member 16.

Therefore, when the cylinder 1 is loosely screwed into the cover member 16 due to vibration of the shock absorber or the like, the stopper ring 2 fitted on the outer peripheral surface of the cylinder 1
9 is locked at the step between the inner peripheral surface of the collar 20 and the inner peripheral surface of the enlarged diameter portion 28 , so that the cylinder 1 is prevented from rotating and loosening any further.

In the above embodiment, the collar 20 receiving the spring load of the suspension spring 24 is supported by the end face of the lid member 16, but may be supported by a stopper ring 29. Instead of forming the screw 21 on the outer periphery of the collar 20 , a cam surface may be formed, and a cam engaging with this cam surface may be provided on the spring seat side.

[0015]

[Effects of the Invention] As described above, according to the present invention,
A collar is fitted around the outer periphery of the cylinder, a spring seat for supporting one end of a suspension spring is rotatably provided on the outer periphery of the collar, and a detent means is provided between the lid member and the collar, and an inner peripheral surface of the collar is provided. Since a stepped portion is formed and a stopper member is provided on the outer peripheral surface of the cylinder to be locked by the stepped portion of the collar, the cylinder screwed to the lid member can be securely prevented from coming off loosely. Moreover, unlike the case where a set screw is used, the cylinder is not deformed, and the piston stroke can be increased.

[Brief description of the drawings]

FIG. 1 is a half sectional view of a shock absorber to which a cylinder fixing structure according to the present invention is applied.

FIG. 2 is a sectional view of a main part of the shock absorber.

FIG. 3 is a front view of a main part of the shock absorber.

FIG. 4 is a sectional view of a main part of a conventional shock absorber.

[Description of Signs] 1 ... Cylinder, 6 ... Hollow rod (piston rod) , 7
... piston, 16 ... lid member, 20 ... collar 21 ... screw,
22 ... spring seat, 23 ... lock nut, 24 ...
Suspension springs, 26: projections forming detent means, 27: notches forming detent means, 28: enlarged diameter portion of collar inner peripheral surface, 29: retaining member (stopper ring) .

Claims (3)

(57) [Scope of request for utility model registration] 1. A piston that slides in contact with an inner peripheral surface of a cylinder is mounted on a distal end portion of a piston rod inserted from one end opening side of a cylinder, and a lid member is screwed onto the other end opening of the cylinder, and the cylinder is connected to the cylinder. In a shock absorber having a suspension spring interposed between the piston rod and a collar, a collar is fitted around the cylinder, and a spring seat for supporting one end of the suspension spring is rotatably provided on the outer periphery of the collar. Further, a detent means is provided between the lid member and the collar, and a step portion is formed on an inner peripheral surface of the collar,
A cylinder fixing structure for a shock absorber, wherein a stopper member is provided on an outer peripheral surface of the cylinder so as to be locked by a step portion of the collar. 2. The stopper member according to claim 1, wherein the stopper member is a stopper ring fitted on an outer peripheral surface of the cylinder.
3. The cylinder fixing structure of the shock absorber according to 1. 3. A screw is engraved on an outer periphery of the collar,
The cylinder fixing structure for a shock absorber according to claim 1 or 2, wherein a spring seat is rotatably screwed to the screw.