Planetary gear transmission systems or components – Fluid drive or control of planetary gearing – Fluid controlled mechanical clutch or brake
Patent
1997-12-09
1999-08-31
Bonck, Rodney H.
Planetary gear transmission systems or components
Fluid drive or control of planetary gearing
Fluid controlled mechanical clutch or brake
188 77W, 92 84, 192 86, F16H 4830
Patent
active
059446277
ABSTRACT:
A replacement mechanism or servo assembly for applying a band to an input member of an automatic transmission includes a housing in which an apply piston is located and to which an apply pin is connected. The piston is sealably movable in the housing and includes a major piston member having a first distal reaction face and a minor piston member integral with the major piston and having a second distal reaction face. A pressure fluid distribution device applies a working fluid against both of the first distal reaction face and the second distal reaction face in order to move the piston with the resultant force of the pressures on both reaction faces and to cause the apply pin to move toward the band to compress the band about the input member with this resultant force. In a preferred embodiment, the housing further includes a pressure separator immovably disposed between the first distal reaction face and an adjacent second proximal face of the minor piston member. The pressure fluid distribution device includes a first passageway between the pressure separator and the housing by which fluid pressure applied against the second distal reaction face is also applied against the first distal reaction face, and a relief distribution device which includes a second passageway between the major piston and the minor piston by which a relief pressure provided against the second proximal face is also provided against the first proximal face.
REFERENCES:
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patent: 4388986 (1983-06-01), Umezawa
patent: 4601233 (1986-07-01), Sugano
patent: 4787494 (1988-11-01), Ogasawara et al.
patent: 4881453 (1989-11-01), Armstrong
patent: 4901605 (1990-02-01), Taguchi
patent: 4930373 (1990-06-01), Nakawaki et al.
patent: 5235899 (1993-08-01), Hauser
Darling-Owen Douglas L.
Jackson Scott C.
Bonck Rodney H.
Ho Ha
Sonnax Industries, Inc.
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