Viscous fluid coupling and improved valve assembly therefor

Details Viscous fluid coupling and improved valve assembly therefor Viscous fluid coupling and improved valve assembly therefor

1998-02-04

2000-05-02

Marmor, Charles A

192 clutches and power-stop control

Clutches

Fluent material

192 588, F16D 3100

Patent

active

060560983

ABSTRACT:
A fluid coupling device is disclosed of the type having an output coupling assembly (13) and an input coupling member (11). Control of the flow of viscous fluid between a reservoir chamber (35) and an operating chamber (33) is by rotation of a valve arm (43), to cover or uncover a fill opening (45). Rotation of the valve arm is affected by an actuator assembly (61). A raised portion (79) on a plate (73) attached to an armature (67) biases the valve arm (43) into sealing engagement with a surface (31) which defines a fill port (45,89), thus reducing fluid leakage from the reservoir (35) back into the operating chamber (33). A portion (85) which covers the fill port includes a dimple (91) which is disposed within the fill opening when the valve arm is in its closed position (FIG. 5). As the valve arm begins to move toward its open position (FIG. 6), the dimple (91) causes a camming and axial separation of the valve arm from the adjacent surface, to reduce the undesirable results of viscous drag on the valve arm.

REFERENCES:
patent: 3856122 (1974-12-01), Leichliter
patent: 4346797 (1982-08-01), Bopp
patent: 4846325 (1989-07-01), Mohan
patent: 4960191 (1990-10-01), Lembert et al.
patent: 5014836 (1991-05-01), Harima et al.
patent: 5090533 (1992-02-01), Inoue
patent: 5152383 (1992-10-01), Boyer et al.
patent: 5511643 (1996-04-01), Brown
patent: 5722523 (1998-03-01), Martin

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