Planetary gear transmission systems or components – Fluid drive or control of planetary gearing – Fluid controlled mechanical clutch or brake
Patent
1995-11-08
1997-06-03
Wright, Dirk
Planetary gear transmission systems or components
Fluid drive or control of planetary gearing
Fluid controlled mechanical clutch or brake
F16H 6108
Patent
active
056348657
ABSTRACT:
Disclosed is a hydraulic control system for an automatic transmission, including a hydraulic pump; a regulator valve for constantly regulating hydraulic pressure generated from said hydraulic pump; a reducing valve for reducing hydraulic pressure regulated by the regulator valve; a first-to-second speed shift valve for feeding hydraulic pressure to a friction member which is applied as a reacting element in a second speed; and a second-to-third/fourth-to-third speed shift valve for feeding hydraulic pressure to another friction member which is applied in third and fifth speeds. The first-to-second and second-to-third/fourth-to-third speed shift valves are respectively provided with control ports to which hydraulic pressure which is used for applying a friction member in fourth and fifth speeds is fed. The control ports are connected to a line, the line being provided with a shuttle valve.
REFERENCES:
patent: 4395927 (1983-08-01), Muller et al.
patent: 5113723 (1992-05-01), Ishino et al.
patent: 5288279 (1994-02-01), Sakai et al.
patent: 5342253 (1994-08-01), Mizobe et al.
Hyundai Motor Corp.
Wright Dirk
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