Actuator for gear shifting mechanisms for motor vehicles

Details Actuator for gear shifting mechanisms for motor vehicles Actuator for gear shifting mechanisms for motor vehicles

1997-05-02

1999-09-28

Lopez, F. Daniel

Expansible chamber devices

With inspection window in expansible chamber wall portion

With lock

92 131, F01B 2504, F15B 1524

Patent

active

059570288

ABSTRACT:
An actuator for a gear shifting mechanism of a motor vehicle has a housing with pressure chambers and one connector opening into each pressure chamber for supplying a pressure medium into the pressure chambers. A control member is positioned in the housing so as to be axially displaceable in the housing by the pressure medium into different switching positions. A first and second auxiliary piston are supported on the control member and displaceable relative to the control member by the pressure medium. The first auxiliary piston has a first end facing away from the second auxiliary piston, the first end of the first auxiliary piston having a first abutment. The second auxiliary piston has a first end facing away from the first auxiliary piston, the first end of the second auxiliary piston having a first abutment. The first auxiliary piston delimits at least partially the first pressure chamber and the second auxiliary piston delimits at least partially the second pressure chamber. The housing has at least one counter abutment for each auxiliary piston. The first auxiliary piston has at least one second abutment. The second auxiliary piston has at least one second abutment. The control member has at least one counter abutment, wherein the at least one second abutment of the first and second auxiliary pistons are located in a path of movement of the at least one counter abutment of the control member.

REFERENCES:
patent: 2806449 (1957-09-01), Simmons
patent: 3572214 (1971-03-01), Woodward
patent: 3713364 (1973-01-01), Francia
patent: 3882759 (1975-05-01), Formwalt et al.
patent: 4072087 (1978-02-01), Mueller
patent: 4450928 (1984-05-01), Weber et al.
patent: 5086863 (1992-02-01), Tischer

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