Clutch release-actuating hydraulic cylinder fluid chamber construction
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United States of America Patent
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Oct 17, 1995
Grant Date -
N/A
app pub date -
Sep 17, 1993
filing date -
Sep 18, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Construction in order to improve wear-resistance of a hydraulic fluid chamber in which a clutch release-actuating tubular piston is operative within a cylindrical housing made of a resin-based material reinforced with glass fiber, the piston axially driving a clutch release bearing to force a clutch diaphragm spring to release the clutch of a motor vehicle power train. A sealing member is provided on tile piston for sealing piston-driving hydraulic fluid within the fluid chamber. The cylindrical housing is double-walled, defining the axially extending tubular fluid chamber. A layer of nickel is electroless-plated at least along the fluid chamber bore where the sealing member slides; alternatively stainless steel linings are installed along the corresponding portions of the chamber bore. The plated layer or linings on the fluid chamber improve wear resistance of tile cylindrical housing and make the sealing member less susceptible to damage, lengthening the life of the hydraulic cylinder apparatus composed by the cylindrical housing and associated elements.
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