Machine element or mechanism – Gearing – With fluid drive
Patent
1986-07-02
1987-12-22
Krizmanich, George H.
Machine element or mechanism
Gearing
With fluid drive
74740, 74752C, 192 85AA, 192109F, F16H 4700
Patent
active
047139846
ABSTRACT:
In an automatic transmission having a four-element two-stage torque converter and a planetary gear transmission which carries out a change-over operation of drive stage of plural planetary gear elements by hydraulically engaging and disengaging plural friction elements from the rear stage of the torque converter transmitting engine power by means of fluid; a drive stage control mechanism for automatic transmission, in which a piston carrying out the engagement and disengagement of the friction members by means of hydraulic force. The pressure surface of the piston is formed into plural concentric stepped surfaces. A pressure oil passage port interconnecting with a control valve for controlling charge and discharge of hydraulic pressure is provided at any one stage of the plural stepped surfaces. A passage leading the hydraulic pressure from such any one stage to another stage and having a throttling function is provided. An elastic member effecting a pressure force on a friction element when engaging the friction element is provided between the piston and the friction element.
REFERENCES:
patent: 3126752 (1964-03-01), Bolster
patent: 3282385 (1966-11-01), Snyder
patent: 3378111 (1968-04-01), Greer et al.
patent: 3633439 (1972-01-01), Annis
patent: 3650364 (1972-03-01), Laing
patent: 4144955 (1979-03-01), Garnier
Kabushiki Kaisha Daikin Seisakusho
Krizmanich George H.
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