Piston for automatic transmission
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Apr 12, 2011
Grant Date -
Oct 9, 2008
app pub date -
Apr 3, 2008
filing date -
Apr 4, 2007
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
To prevent effects of small amplitude oscillations caused by pressure fluctuation, eccentric attachment of a cancel plate and biased load application of a return spring, and to achieve a long service life of the inner peripheral seal portion, a BPS (1) with a piston member (20) moving in an axial direction inside a cylinder (10) and defining a compression chamber (M) together with the cylinder (10) and a cancel plate (30) opposing to a bottom portion (11) of the cylinder (10) beyond the piston member (20) is provided with an inner peripheral seal portion (50) with a seal lip (52) slidably contacting an inner peripheral tube portion (13) of the cylinder (10) and a fitting portion (53) fitted to the inner peripheral tube portion (13) in an inner peripheral end portion (35) of the cancel plate (30).
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