Expansible chamber devices – Piston with rigid axially extending hollow stem – Hollow stem forms axially extending fluid passage
Patent
1992-03-02
1993-08-17
Look, Edward K.
Expansible chamber devices
Piston with rigid axially extending hollow stem
Hollow stem forms axially extending fluid passage
921711, 92181R, 475146, 188 77R, F01B 3100
Patent
active
052358992
ABSTRACT:
This invention is directed to a new and novel envelope for housing a servo mechanism adapted to control a brake assembly used in conjunction with a vehicular transmission. The envelope is adapted to be demountably received within a receptacle provided in the transmission case. A pilot bore penetrates the transmission case and is located axially of the receptacle. The envelope incorporates a base portion, a cap portion and a coupler portion. A servo-apply pin extends outwardly through the coupler portion of the envelope to be reciprocatingly received within the pilot bore. A piston chamber is provided interiorly of the base and cap portions. An actuating piston is operatively received in the piston chamber, and means are included to effect communication of hydraulic pressure from a conduit within the transmission case, through the coupler portion of the envelope and the servo-apply pin into the piston chamber. Locking means are also provided selectively to secure the envelope to the transmission case.
REFERENCES:
patent: 4628795 (1986-12-01), Pickard et al.
patent: 4838126 (1989-06-01), Wilfinger et al.
patent: 4881453 (1989-11-01), Armstrong
General Motors Corporation
Look Edward K.
Lopez F. Daniel
Scherer Donald F.
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