Hydraulic control system of automatic transmission for vehicle

Details Hydraulic control system of automatic transmission for vehicle Hydraulic control system of automatic transmission for vehicle

2007-12-05

2010-12-21

Ho, Ha D. (Department: 3655)

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Fluid controlled mechanical clutch or brake

C475S121000, C477S053000, C477S062000

Reexamination Certificate

active

07854676

ABSTRACT:
A cost for manufacturing an automatic transmission can be reduced since a separate solenoid valve for controlling a damper clutch is not required when a hydraulic control system of an automatic transmission for a vehicle includes: a regulator valve that forms a line pressure by regulating a hydraulic pressure generated by a hydraulic pump; a torque converter control valve that receives a hydraulic pressure from the regulator valve and supplies a torque converter operating pressure to a torque converter; and a damper clutch control valve that receives the hydraulic pressure of the torque converter control valve and selectively supplies the torque converter operating pressure and a damper clutch operating pressure, wherein the damper clutch control valve is controlled by a control pressure supplied from a switch valve that is controlled an operating pressure of an overdrive clutch that operates at third and fourth forward speeds.

REFERENCES:
patent: 6299560 (2001-10-01), Fujioka et al.
patent: 6503169 (2003-01-01), Nakano et al.
patent: 6634991 (2003-10-01), Itou et al.
patent: 6746355 (2004-06-01), Shin et al.
patent: 08-210494 (1996-08-01), None
patent: 20-1999-0031626 (1999-07-01), None

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