Planetary gear transmission systems or components – Fluid drive or control of planetary gearing – Fluid controlled mechanical clutch or brake
Patent
1995-06-01
1996-12-31
Wright, Dirk
Planetary gear transmission systems or components
Fluid drive or control of planetary gearing
Fluid controlled mechanical clutch or brake
F16H 6100
Patent
active
055889271
ABSTRACT:
A control system for an automatic transmission includes a first frictional engagement element and a second frictional engagement element; and a first hydraulic servo for controlling the application/release of the first frictional engagement element and a second hydraulic servo for controlling the application/release of the second frictional engagement element. A regulator valve regulates the oil pressure to the first hydraulic servo. A signal pressure is applied to the regulator valve to establish a predetermined gear stage by switching the applied/released states of the first frictional engagement element and the second frictional engagement element by feeding/releasing oil pressure to/from the first hydraulic servo and the second hydraulic servo. The regulator valve includes a valve member having: a first pressure receiving area to which is applied the feed pressure to the first hydraulic servo as a feedback pressure in a first direction; a second pressure receiving area to which is applied the signal pressure in a second direction opposite the first direction; a fourth pressure receiving area to which is applied the feed pressure to the second hydraulic servo in the first direction, in a shift wherein the first frictional engagement element is released while the second frictional-engagement element is applied; and a third pressure receiving area to which is applied the signal pressure in the second direction, for regulation of the oil pressure only during a shift.
REFERENCES:
patent: 3605525 (1971-09-01), Pierce et al.
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patent: 4674364 (1987-06-01), Shindo et al.
patent: 4724727 (1988-02-01), Shibayama et al.
patent: 5115696 (1992-05-01), Tajada et al.
patent: 5472389 (1995-12-01), Ando et al.
Ando Masahiko
Fukatsu Akira
Fukumura Kagenori
Hamajima Tetsuo
Hayabuchi Masahiro
Aisin Aw Co. Ltd.
Toyota Jidosha & Kabushiki Kaisha
Wright Dirk
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