Planetary gear transmission systems or components – Fluid drive or control of planetary gearing – Fluid controlled mechanical clutch or brake
Patent
1993-12-15
1996-04-16
Marmor, Charles A.
Planetary gear transmission systems or components
Fluid drive or control of planetary gearing
Fluid controlled mechanical clutch or brake
B60K 4110
Patent
active
055077005
ABSTRACT:
A hydraulic control unit for an automatic transmission having a plurality of power transmitting paths and a plurality of engaging clutches and/or brakes for selecting any one of the transmitting paths to set a gear position. The unit comprises a regulator valve for producing a line pressure, an operating pressure control valve for producing an operating pressure supplied to the engaging clutch or brake by regulating the line pressure from the regulator valve, and a line pressure switching valve for making the line pressure produced by the regulator valve low at a specified gear position when a target operating pressure set by the operating pressure control valve is lower than a specified value and making the line pressure high when the target operating pressure is higher than the specified value.
REFERENCES:
patent: 3418871 (1968-12-01), Cartwright et al.
patent: 4046033 (1977-09-01), Hashimoto et al.
patent: 4495838 (1985-01-01), Gooch
patent: 4633738 (1987-01-01), Timte
patent: 5111719 (1992-05-01), Okahara
patent: 5288279 (1994-02-01), Sakai et al.
Honda Giken Kogyo Kabushiki Kaisha
Jensen Nathan O.
Marmor Charles A.
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