Planetary gear transmission systems or components – Fluid drive or control of planetary gearing – Fluid controlled mechanical clutch or brake
Reexamination Certificate
2005-06-14
2005-06-14
Bonck, Rodney H. (Department: 3681)
Planetary gear transmission systems or components
Fluid drive or control of planetary gearing
Fluid controlled mechanical clutch or brake
C475S116000, C192S083000, C192S085060, C192S10900B, C192S003570, C192S003580
Reexamination Certificate
active
06905433
ABSTRACT:
A device for control of a hydraulically actuatable shifting element of a motor vehicle transmission, having one clutch piston which defines, with a first surface, a hydraulically pressurizable piston space and, with a second surface of different size, a hydraulically pressurizable reset space and comprising a first clutch valve associated with the piston space, a second clutch valve associated with the reset space and a holding valve associated with the reset space. The valves can be moved according to a control pressure adjusted by a pressure adjuster, a change between a pressurization of the clutch piston on the piston space side and on the reset space, side being performed as a control function so that the clutch piston on its surface facing the reset space is pressurized in an unshifted state of the shifting element and is discharged in a shifted state of the shifting element.
REFERENCES:
patent: 4420994 (1983-12-01), Muller et al.
patent: 4637504 (1987-01-01), Rule et al.
patent: 4660693 (1987-04-01), Taga et al.
patent: 4838126 (1989-06-01), Wilfinger et al.
patent: 5103930 (1992-04-01), Gierer
patent: 5305862 (1994-04-01), Gierer
patent: 6827194 (2004-12-01), Steinel et al.
patent: 38 50 354 (1994-10-01), None
patent: 197 54 491 (1999-06-01), None
patent: 405590 (1991-01-01), None
Gierer Georg
Schmidt Thilo
Steinhauser Klaus
Bonck Rodney H.
Davis & Bujold P.L.L.C.
Le David D.
ZF Friedrichshafen AG
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