Spring devices – Vehicle – Mechanical spring and nonresilient retarder
Reexamination Certificate
1999-04-28
2001-04-17
Butler, Douglas C. (Department: 3613)
Spring devices
Vehicle
Mechanical spring and nonresilient retarder
C188S322190, C188S322170, C267S033000, C267S286000
Reexamination Certificate
active
06217012
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a spring seat fixing structure for a hydraulic shock absorber.
2. Description of the Related Art
Conventionally, a hydraulic shock absorber having a damper tube and a suspension spring has been proposed as disclosed in Examined Utility Model Publication (Kokoku) No. 55-12608. The hydraulic shock absorber is constructed in a manner that a cap is fixedly forced (pressed in) into a periphery of a shaft seal part of the damper tube, and a spring seat for the suspension spring is located on an outer periphery on a distal end side of the cap.
In the aforesaid hydraulic shock absorber, in the case of providing a suspension spring having a desired length along an axial direction around the damper tube, a spring seat for the suspension spring must be located on a distal end side separated from the shaft seal part of the damper tube in the axial direction. Further, in order to retain the spring seat onto the damper tube without a misalignment, it is preferable that the cap is fixedly forced into the damper tube up to a location nearest to a spring seat mounting portion on the distal end side of the cap. Therefore, the cap needs to be fixedly forced into the damper tube by a considerably long range up to a location nearest to the spring seat mounting portion considerably separated from the shaft seal part of the damper tube in the axial direction.
However, in the aforesaid prior art, an outer diameter of the damper tube is formed in a straight line. In the case where a considerably long portion from a proximal end side to the distal end side of the cap is used as a force-fit portion, in a process for fixedly forcing a force-fit portion on the distal end side of the cap into an outer diameter portion of the damper tube, a long portion of the damper tube is used as a force-fit surface. For this reason, it is difficult to force the cap into the damper tube.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a spring seat mounting portion in a cap which is fixedly forced into a periphery of a shaft seal part of a damper tube, and to stably provide a spring seat without misalignment when mounting the spring seat onto a distal end side of the cap separated from the shaft seal part of the damper tube in the axial direction, and thus, to readily force the cap into the damper tube.
To achieve the above object, the present invention provides a spring seat fixing structure for a hydraulic shock absorber which has a damper tube and a suspension spring, and is constructed in a manner such that a cap is fixedly forced into a periphery of a shaft seal part of the damper tube, and an outer periphery on a distal end portion of the cap is provided with a spring seat, wherein the damper tube has a small outer diameter portion around the shaft seal part and a large outer diameter portion on a side separated from the shaft seal part in an axial direction. A proximal end side of the cap is provided with a small diameter force-fit portion which is fixedly forced into the small outer diameter portion of the damper tube, and a distal end side of the cap is provided with a large diameter force-fit portion which is fixedly forced into the large outer diameter portion of the damper tube.
REFERENCES:
patent: 3892397 (1975-07-01), Nicholls
patent: 4795010 (1989-01-01), Kaneko
patent: 5328196 (1994-07-01), Ohma
patent: 5553713 (1996-09-01), Sydekum et al.
patent: 5620172 (1997-04-01), Fulks et al.
patent: 5961106 (1999-10-01), Shaffer
patent: 6076814 (2000-06-01), Grundei
patent: 19506699 (1996-04-01), None
patent: 974476 (2000-01-01), None
patent: 55-12608 (1980-03-01), None
Butler Douglas C.
Orum & Roth
Showa Corporation
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