Planetary gear transmission systems or components – Fluid drive or control of planetary gearing – Fluid controlled mechanical clutch or brake
Patent
1999-08-12
2000-08-15
Wright, Dirk
Planetary gear transmission systems or components
Fluid drive or control of planetary gearing
Fluid controlled mechanical clutch or brake
477906, F16H 6112, F16H 6302
Patent
active
061028266
ABSTRACT:
A plurality of shift control valves for independently controlling the supply of hydraulic oil to, and the discharge thereof from, a plurality of hydraulic engaging elements are divided into a first group of shift control valves which establish a predetermined-speed transmission train and a second group of shift control valves corresponding to the other hydraulic engaging elements. A fail-safe valve is interposed between an oil supply passage which is connected to a hydraulic pressure source and the second group of speed change control valves. The fail-safe valve is switched to a closed position in a condition in which the hydraulic oil is supplied to all of such plurality of hydraulic engaging elements as are not to be engaged at the same time, whereby the oil supply passage is connected only to the first group of shift control valves. Each of the first group of shift control valves is provided with an oil chamber for urging it toward an oil supply position. Each of the oil chambers is connected to the oil supply passage via the fail-safe valve in the closed position thereof. At the time of failure, the line pressure from the oil supply passage is inputted into oil chambers to thereby forcibly switch the first group of shift control valves to the oil supply position. The hydraulic oil is thus supplied to the corresponding hydraulic engaging elements.
REFERENCES:
patent: 5509868 (1996-04-01), Eaton
Nakajima Kenji
Takahashi Tooru
Honda Giken Kogyo Kabushiki Kaishi
Wright Dirk
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