Planetary gear transmission systems or components – Fluid drive or control of planetary gearing – Fluid controlled mechanical clutch or brake
Patent
1994-02-04
1995-12-26
Wright, Dirk
Planetary gear transmission systems or components
Fluid drive or control of planetary gearing
Fluid controlled mechanical clutch or brake
475120, F16H 5936
Patent
active
054782880
ABSTRACT:
An automatic power transmission of an automotive vehicle includes various frictional elements and frictional brakes and can prevent a shift shock from occurring by increasing a working hydraulic pressure applied to a certain frictional element (forward clutch F/C) so as to make fast a reengagement of the certain frictional element when a down-shifting from a high gear speed range to a low gear speed range occurs. In a preferred embodiment, the working hydraulic pressure present during the down-shifting is introduced into an accumulator so as to disable a stroke of the accumulator. In another preferred embodiment, a time at which a shifting solenoid (A) is turned from its ON state to its OFF state is retarded after a control valve control solenoid (C) is turned from its OFF state to its ON state in response to an instruction of a controller to shift down the gear speed range. In addition, a fuel consumption of the associated engine is improved by an extension of a lock-up interval off a torque converter.
REFERENCES:
patent: 4125038 (1978-11-01), Hiramatsu
patent: 5111719 (1992-05-01), Okahara
Japanese Service Manual, "Nissan Maxima New Model Explanation Book J30 Type Series, Introduction of Vehicle Modified Points", (Aug. 1991).
Sakakibara Satoshi
Wakahara Tatsuo
Nissan Motor Co,. Ltd.
Wright Dirk
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