Planetary gear transmission systems or components – Fluid drive or control of planetary gearing – Fluid controlled mechanical clutch or brake
Patent
1997-09-19
1999-03-09
Wright, Dirk
Planetary gear transmission systems or components
Fluid drive or control of planetary gearing
Fluid controlled mechanical clutch or brake
475131, 475134, F16H 6126
Patent
active
058792589
ABSTRACT:
A shift control valve has a valve body in which is rotatably disposed a flow directing plate. Pressurized "drive" fluid is supplied to a control passage in the plate. The control passage communicates with a plurality of radial passages extending therefrom. Circumferential and axial passages communicating with the radial passages selectively direct fluid flow, through the valve body, from the control feed passage to friction device control passages to establish the engagement of friction devices. A plurality of exhaust passages control fluid flow for the disengagement of the friction devices. Supplemental axial feed passages are available to supply fluid pressure for the friction devices during selected ratios other than "drive".
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patent: 5046999 (1991-09-01), Liu et al.
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patent: 5454764 (1995-10-01), Koenig et al.
patent: 5545099 (1996-08-01), Jang
Koenig Melissa Mei
Stevenson Paul Dwight
Bridges Michael J.
General Motors Corporation
Kwon Peter T.
Scherer Donald F.
Wright Dirk
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