Control circuit for fluid coupling with lock-up clutch

Details Control circuit for fluid coupling with lock-up clutch Control circuit for fluid coupling with lock-up clutch

1988-03-29

1989-11-14

Bonck, Rodney H.

192 clutches and power-stop control

Vortex-flow drive and clutch

Including drive-lockup clutch

192 329, F16H 4502, F16D 4702

Patent

active

048800910

ABSTRACT:
A control circuit of a fluid coupling with a lock-up clutch includes a fluid coupling having a power chamber into which a working fluid is introduced for performing a transfer action between input and output elements via the fluid, a clutch member which suitably connects and disconnects the input and output elements, a working chamber formed separately of the power chamber, and a piston member displaced by a pressure difference between the working and power chambers to selectively engage and disengage the clutch member. The control circuit also includes a fluid pressure source for supplying the working fluid to the power chamber, a lock-up clutch control unit for selectively supplying and discharging a fluid to and from the working chamber to control the engagement and disengagement of the clutch member, a control apparatus responsive to supply and discharge of the fluid to and from the working chamber by the lock-up clutch control unit for lowering pressure inside the power chamber to a hydraulic pressure in proportion to that from a throttle valve, and an oil line for supplying a lubricant pressure line via a port in the lock-up clutch control unit with some of such working fluid to be supplied to the working chamber.

REFERENCES:
patent: 2736412 (1956-02-01), Livezey
patent: 3252352 (1966-05-01), General et al.
patent: 4051932 (1977-10-01), Arai et al.
patent: 4781279 (1988-11-01), Georg

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