Friction clutch having a hydraulic actuator, and drive unit...

Details Friction clutch having a hydraulic actuator, and drive unit... Friction clutch having a hydraulic actuator, and drive unit...

2006-05-26

2010-11-16

Lorence, Richard M. (Department: 3655)

192 clutches and power-stop control

Clutches

Operators

C192S085320, C192S085420

Reexamination Certificate

active

07832540

ABSTRACT:
The invention relates to a friction clutch having a single-acting actuator which is a piston-cylinder unit and is connected in a controllable fashion to a pressurized fluid source. In order to be able to carry out a fast pilot stroke up to the point at which the clutch makes contact, the piston-cylinder unit has a stepped piston whose first step of small diameter delimits, by means of its cylinder, a first pressure space, and whose second step of relatively large diameter delimits, by means of its cylinder, a second pressure space, a pressure line being connected to the first pressure space and, by means of a first non-return valve which opens at a certain pressure, to the second pressure space, and it also being possible for the second pressure space to be connected via a discharge line and a suction line, which contains a second non-return valve, to the fluid reservoir. The invention also relates to a drive device having clutches of said type.

REFERENCES:
patent: 4845982 (1989-07-01), Gilbert
patent: 4875561 (1989-10-01), Schneider et al.
patent: 6240758 (2001-06-01), Nagakura
patent: 7104380 (2006-09-01), Bishop et al.
patent: 2006/0162328 (2006-07-01), Quehenberger et al.
patent: 33 05 999 (1984-05-01), None
patent: 38 39 318 (1989-06-01), None
patent: 44 44 381 (1996-06-01), None
patent: 2004/040158 (2004-05-01), None

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