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US 6,659,470 B2Granted
Oil seal of hydraulic shock absorber
AssigneeShowa Corporation
InventorsHironobu Hosoda, Noriaki Maneyama
Life of this patent
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Abstract
In an oil seal of a hydraulic shock absorber, the oil seal is made of a nitrile rubber of a low nitrile, and an inner diameter of a second lip is set to be smaller within a range between 0.3 and 1.0 mm φ than an outer diameter of a piston rod.
Claims5
An oil seal of a hydraulic absorber which is sealed at an opening of a cylinder, wherein:
- a core metal comprising a plane plate, is integrally molded with each of a first oil seal lip, a second oil seal lip, a first dust lip, a second dust lip, a check lip, and an outer periphery lip,
- the oil seal is made of a nitrile rubber of a low nitrile which contains abrasion resisting material,
- an inner diameter of the second oil seal lip is within a range of 0.3 and 1.0 mm φ smaller than an outer diameter of a piston rod,
- an oil level angle of the first oil seal lip, formed by a lip forming surface facing to the oil chamber of the first oil seal lip with respect to an outer periphery of the piston rod is defined within a range between 45 and 54 degrees.
1 more element
Dependencies are inferred from the claim text.