Automatic transmission control system with variable pressure dis

Details Automatic transmission control system with variable pressure dis Automatic transmission control system with variable pressure dis

1994-05-31

1996-08-06

Bonck, Rodney H.

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Fluid controlled mechanical clutch or brake

475129, 477130, 477150, 477158, F16H 6126

Patent

active

055428886

ABSTRACT:
An automatic transmission control system has first and second hydraulic circuits leading to a low/reverse brake and a reverse clutch, respectively, which perform supplying and discharging of hydraulic pressure to the low/reverse brake and reverse clutch, respectively, so as to lock and unlock them. The first circuit is provided, from the upstream end, with an orifice for restraining hydraulic pressure, an accumulator disposed downstream from the orifice for pressure accumulation, and a switching valve for switching supply and discharge of the hydraulic pressure. The second hydraulic circuit is provided, from the upstream end, with a switching valve for switching communication of the first hydraulic circuit between the orifice and switching valve with the second hydraulic circuit and communication of the first hydraulic circuit upstream from the orifice with the second hydraulic circuit.

REFERENCES:
patent: 4422536 (1983-12-01), Shatuck
patent: 5176046 (1993-01-01), Fujiwara et al.
patent: 5246407 (1993-09-01), Paulsen et al.

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