192 clutches and power-stop control – Clutches – Operators
Reexamination Certificate
2006-06-12
2009-12-22
Lorence, Richard M. (Department: 3655)
192 clutches and power-stop control
Clutches
Operators
C192S003580, C074S335000
Reexamination Certificate
active
07635057
ABSTRACT:
A device for controlling a hydraulically operable switching element (2) of an automatic transmission of a vehicle with a position valve mechanism (3) having a main switch piston (6) which is spring biased into a first switch position and a second switch position with a pilot pressure (P_MV) which is adjustable through an electrically operated actuator (5). An additional switch piston (7) and the main switch piston (6) are axially actuated in a valve housing (8). Depending on the position of the pistons (6, 7), faces (6A,7A) of the respective pistons are either spaced apart or adjacent. The additional switch piston (7) is adjustable depending on a pilot pressure (p_K) of a switching element which engages a gear for forward drive.
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Gierer Georg
Herrmann Markus
Schmidt Thilo
Davis & Bujold P.L.L.C.
Lorence Richard M.
ZF Friedrichshafen AG
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