Master cylinder
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United States of America Patent
Stats
-
Apr 25, 2006
Grant Date -
Jan 27, 2005
app pub date -
Jul 23, 2004
filing date -
Jul 23, 2003
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A brake master cylinder includes a cylinder body having a circumferential groove formed therein. A primary cup is received in the groove and supported axially by a rear wall defined by the groove. A primary piston is inserted in the cylinder body in sliding contact with the primary cup. The rear wall has a radially inner surface formed with a plurality of grooves. A passage leading to a reservoir is provided in the rear of the grooves. The piston is formed with radial through holes corresponding to the grooves. When the piston is at the return end of its stroke, the pressure chamber defined in the cylinder body can communicate with the reservoir through the radial through holes, the grooves and the passage.
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