Seal for a joint or juncture – Seal between relatively movable parts – Circumferential contact seal for other than piston
Reexamination Certificate
2001-11-07
2003-12-09
Pickard, Alison (Department: 3676)
Seal for a joint or juncture
Seal between relatively movable parts
Circumferential contact seal for other than piston
C277S565000, C277S573000, C277S944000, C277S916000, C277S437000
Reexamination Certificate
active
06659470
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an oil seal of a hydraulic shock absorber.
2. Description of the Related Art
In a hydraulic shock absorber for a vehicle, as described in Japanese Utility Model Application Laid-Open No. 5-3739, an oil seal is sealed in an opening portion of a cylinder, and a first lip and a second lip of the oil seal are slidably contact with a piston rod at two axial positions in a side of an oil chamber of the cylinder and a side of an outer portion thereof.
In a damping property of the hydraulic shock absorber, various kinds of frictions or the like are added to a hydraulic damping force generated by a damping force generating valve, whereby a total property is indicated.
According to the conventional hydraulic shock absorber, an unstable riding feeling such as a waft feeling is given on a flat road surface, in particular, when the hydraulic damping force is low, so that it is not so preferable.
SUMMARY OF THE INVENTION
An object of the present invention is to improve a riding feeling of a vehicle in a hydraulic shock absorber by paying attention to a shape of an oil seal and a material.
The present invention relates to an oil seal of a hydraulic shock absorber provided with a first lip and a second lip which are sealed in an opening portion of a cylinder and are slidably in contact with a piston rod at two axial positions in a side of an oil chamber and a side of an outer portion of the cylinder, wherein
the oil seal is made of a nitrile rubber of a low nitrile, and wherein
an inner diameter of the second lip is set to be smaller within a range between 0.3 and 1.0 mm &phgr; than an outer diameter of the piston rod.
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Hosoda Hironobu
Maneyama Noriaki
Orum & Roth
Pickard Alison
Showa Corporation
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