Planetary gear transmission systems or components – Fluid drive or control of planetary gearing – Fluid controlled mechanical clutch or brake
Reexamination Certificate
2006-01-17
2008-10-21
Estremsky, Sherry (Department: 3681)
Planetary gear transmission systems or components
Fluid drive or control of planetary gearing
Fluid controlled mechanical clutch or brake
C137S495000
Reexamination Certificate
active
07438660
ABSTRACT:
A pressure regulator valve is provided having a valve spool slidably disposed within a stepped bore defined by a valve body. A first pressure responsive surface area is defined on the valve spool and is subject to pressurized fluid from a main pressure source. A second pressure responsive surface area is defined on the valve spool and is subject to pressurized fluid from a control source. Additionally, a third pressure responsive surface area is defined on the valve spool and is selectively subject to pressurized fluid from one of the main pressure source and the control source. A sleeve is slidably disposed within the stepped bore, the sleeve being operable to selectively distribute pressurized fluid from one of the main pressure source and the control source to the third pressure responsive surface area to effect a change in pressure gain of the pressure regulator valve.
REFERENCES:
patent: 5669473 (1997-09-01), Long et al.
patent: 5842953 (1998-12-01), Yasue et al.
patent: 5911244 (1999-06-01), Long et al.
patent: 6155949 (2000-12-01), Long et al.
patent: 2007/0167285 (2007-07-01), Long et al.
Cole Jeffrey J.
Long Charles F.
McCauley Phillip F.
Estremsky Sherry
General Motors Corporation
Young Edwin A
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