Lock-up clutch control valves

Details Lock-up clutch control valves Lock-up clutch control valves

1977-03-03

1978-07-11

Coan, James F.

192 clutches and power-stop control

Vortex-flow drive and clutch

Including drive-lockup clutch

192103FA, F16H 4502

Patent

active

040996034

ABSTRACT:
Control valve assemblies for a lock-up clutch in a vehicle drive system, wherein a torque converter normally couples a prime mover with a transmission, vary the degree of engagement of the lock-up clutch with respect to prime mover rotational speed within a predetermined speed range. In the control valve assemblies, a centrifugal valve selectively communicates the fluid pressure operated lock-up clutch with a source of pressure and a fluid drain, with the centrifugal valve having rotor means drivably interconnected with the prime mover. Spool means slidably received within a rotor bore are outwardly displaceable with a first force while resilient bias means oppose and equalize this first force when the prime mover reaches a first predetermined speed, with valve means regulating the flow of pressurized fluid from the rotor means. Reaction means augment the force of the bias means and permits a gradual engagement of the lock-up clutch which progressively increases until the prime mover attains a second higher predetermined speed at which time the lock-up clutch is fully engaged. In one instance a modulating balance valve varies the pressure in the lock-up clutch consistent with the pressure produced by the action of the centrifugal valve.

REFERENCES:
patent: 2894609 (1959-07-01), Tattersall
patent: 2964959 (1960-12-01), Beck et al.
patent: 3240308 (1966-03-01), Frost
patent: 3542175 (1970-11-01), Olson et al.
patent: 3896910 (1975-07-01), Audiffred et al.

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