Planetary gear transmission systems or components – Fluid drive or control of planetary gearing – Fluid controlled mechanical clutch or brake
Patent
1996-06-26
1997-12-09
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
056954239
ABSTRACT:
In a hydraulic control device for an automatic transmission for obtaining the optimum shift-down timing by regulating an accumulator back pressure for an engaging element to be engaged in low-speed gear positions, switch control means is provided for communicating an output oil path communicating with an accumulator back pressure chamber, with a selected one of an accumulator control pressure oil path and a drain oil path. The switch control means maintains communication between the output oil path and the accumulator control pressure oil path due to the output feed-back pressure in the N-speed gear position, and brings the output oil path into communication with the drain oil path, using the N+1 pressure as the operating signal pressure, upon shifting-up from the N-speed to N+1-speed gear position. The switch control means also maintains communication between the output oil path and the drain oil path due to a force other than the N+1 pressure in the N+1-speed gear position, and brings the output oil path into communication with the accumulator control pressure oil path, using only the solenoid pressure as the operating signal pressure, upon shifting-down from the N+1-speed to N-speed gear position.
REFERENCES:
patent: 4274307 (1981-06-01), Iwanaga et al.
patent: 4709597 (1987-12-01), Yasue et al.
Jatco Corporation
Wright Dirk
LandOfFree
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