Lock-up clutch control valve

Details Lock-up clutch control valve Lock-up clutch control valve

F - Mech Eng,Light,Heat,Weapons

16

H

138/12.14

F16H 45/02 (2006.01)

Patent

CA 1087494

LOCK-UP CLUTCH CONTROL VALVES ABSTRACT OF THE DISCLOSURE 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 sonsistent with the pressure produced by the action of the centrifugal valve. -0-

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