Master cylinder
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United States of America Patent
Stats
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Aug 21, 2018
Grant Date -
Sep 3, 2015
app pub date -
Mar 27, 2013
filing date -
Oct 31, 2012
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A piston seal includes an annular base portion, an inner circumferential lip portion protruding from an inner circumferential side of the base portion to come in sliding contact with an outer circumferential surface of the piston, an outer circumferential lip portion protruding from an outer circumferential side of the base portion to come in contact with the circumferential groove of the cylinder main body, and an intermediate protrusion portion protruding from between the inner circumferential lip portion and the outer circumferential lip portion of the base portion further than the outer circumferential lip portion. A connecting portion is formed to extend in an axial direction of the piston seal and is configured to connect the inner circumferential lip portion and the intermediate protrusion portion is formed between the inner circumferential lip portion and the intermediate protrusion portion.
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