Piston for automatic transmission

Details Piston for automatic transmission Piston for automatic transmission

2011-04-12

2011-04-12

Leslie, Michael (Department: 3745)

Expansible chamber devices

Annular working member or annular linearly extending chamber...

C092S240000

Reexamination Certificate

active

07921765

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).

REFERENCES:
patent: 5172799 (1992-12-01), Iijima et al.
patent: 6193042 (2001-02-01), Kempf et al.
patent: 7040474 (2006-05-01), Pedersen et al.
patent: 2004-060750 (2004-02-01), None

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