Master cylinder
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Nov 25, 2003
Grant Date -
Sep 12, 2002
app pub date -
Aug 13, 2001
filing date -
Aug 14, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A master cylinder including a cylinder body having a cylindrical bore and an opening in the circumferential wall for a relief port communicating with the interior of hydraulic reservoir. A piston is slidably inserted into the cylindrical bore to form a hydraulic pressure generating chamber in the cylindrical bore. A cup seal is provided with an inner circumferential lip portion contacting with the piston, an outer circumferential lip portion slidably contacting with the inner circumferential wall of the cylindrical bore, and a base portion connecting the lip portions, which are so arranged as to face to the hydraulic pressure generating chamber. The cup seal cuts the communication between the hydraulic pressure generating chamber and the hydraulic reservoir through the relief port when the top end of the outer circumferential lip portion passes by the relief port. The improvement resides in means provided for rotating the cup seal relative to the cylindrical bore with movement of the piston at portions of the cup seal except those portions facing to the inner wall of the cylindrical bore.
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