Expansible chamber devices – Resilient means interposed between working member and...
Patent
1988-06-27
1989-11-21
Garrett, Robert E.
Expansible chamber devices
Resilient means interposed between working member and...
92130R, 921711, 74868, 74869, 74753, 188 77R, F16J 100
Patent
active
048814539
ABSTRACT:
A self contained servo mechanism (10, 110) for actuating a friction band assembly (13) in a planetary gear set. The servo mechanism (10, 110) is contained within a housing (25, 125) which incorporates a piston chamber (32, 132). The housing (25, 125) is demountably secured within a socket cavity (21, 121) provided in the transmission case (11, 111). A piston means (40, 140) is slidably received within the chamber (32, 132), and the piston means (40, 140) is operatively secured to an actuating pin (55, 155) that is slidably received within a pilot bore (34, 134) which penetrates the housing (25, 125) and which is aligned with the piston chamber (32, 132). The actuating pin is, in turn, operatively connected to a friction band assembly (13) within the transmission case (11, 111). A cover (41, 141) is secured to the transmission case (11, 111) not only to close the socket cavity (21, 121) and the interior cavity (12, 112) of the transmission case (11, 111) from the environment but also to close the piston chamber (32, 132) and to define a pressure portion (51, 151) of the chamber (32, 132) to act against the head (52, 152) of the piston (40, 140). Feed means (75, 175) are provided to effect hydraulic communication to the pressure portion (51, 151) of the piston chamber (32, 132).
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Denion Thomas
Garrett Robert E.
General Motors Corporation
Scherer Donald F.
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