Coupling device and improved fluid pressure system therefor

192 clutches and power-stop control – Clutches – Operators

Reexamination Certificate

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C192S1030FA, C475S088000

Reexamination Certificate

active

07063198

ABSTRACT:
A coupling device (11) of the type including a clutch assembly (29) actuation of which is responsive to fluid pressure in a clutch piston apply chamber (43), and a series of fluid passages (53,55,57,59) communicating the chamber to a control valve assembly (69). A housing (15) defines a hub portion (61) surrounded by a plenum member (17) carrying two high pressure seals (63;163). The housing is formed such that the outer surface (60) of the hub portion is free of graphite porosity, to improve the life of the seals. Preferably, each of the seals (63;163) has a height/width ratio selected to provide the desired radially inward sealing force, but wherein the seals are still able to be assembled within the respective seal cavities (73,75;173,175).

REFERENCES:
patent: 5938555 (1999-08-01), Leeper
patent: 5964126 (1999-10-01), Okcuoglu
patent: 6041903 (2000-03-01), Burns et al.
patent: 6176800 (2001-01-01), Shaffer et al.
patent: 6280613 (2001-08-01), Morse et al.
patent: 6464056 (2002-10-01), Lowell et al.
patent: 6524364 (2003-02-01), Ederyd
patent: 2005/0194231 (2005-09-01), Babin

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