Planetary gear transmission systems or components – Fluid drive or control of planetary gearing – Fluid controlled mechanical clutch or brake
Patent
1994-08-16
1996-01-30
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
054877083
ABSTRACT:
An automatic transmission control system has a plurality of frictional coupling elements within an automatic transmission which are selectively locked and unlocked in a particular way to place the automatic transmission into any desired gear in various ranges. Two specific frictional coupling elements, such as a low/reverse brake and a 3/4 clutch, may potentially cause mechanical locking of the automatic transmission when they are locked simultaneously. The automatic transmission control system, however, includes a first valve for connecting and disconnecting a supply of hydraulic pressure to the low/reverse frictional coupling element to lock and unlock the low/reverse frictional coupling element in low speed and reverse ranges, and a second valve for connecting and disconnecting a supply of hydraulic pressure to the 3/4 frictional coupling element to lock and unlock the 3/4 frictional coupling element. The first and second valves are disposed in series between a hydraulic pressure source and the low/reverse frictional coupling element and cooperate with each other so as to connect supply of hydraulic pressure alternatively to the low/reverse frictional coupling element and the specific frictional coupling element.
REFERENCES:
patent: 5109731 (1992-05-01), Iwatsuki et al.
Mazda Motor Corporation
Wright Dirk
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