Dual stage control for viscous fluid coupling

Details Dual stage control for viscous fluid coupling Dual stage control for viscous fluid coupling

1980-12-29

1982-09-28

Herrmann, Allan D.

192 clutches and power-stop control

Clutches

Fluent material

123 4112, 192 82T, F16D 3500, F16D 4325

Patent

active

043514251

ABSTRACT:
A viscous fan clutch (10) is typically employed in a fan drive mechanism within a truck or automobile. A shaft (12) driven by the engine, rotates a clutch member (24) within the fan drive. The clutch member is arranged for fluid engagement with a cover assembly (38) for the transmission of torque thereto when the fluid is disposed in an operating chamber (70) defined by complementary shear surfaces (30, 31, 56, and 57) in the clutch and cover. During relative rotation between the clutch and cover, fluid is pumped from the operating chamber to primary (76) and secondary (77) fluid storage chambers. Independent fluid temperature responsive control valves (120 and 190) provide for selective communication between the storage chambers and the operating chamber to effect modulation of the total fluid flow whereby dual speed operation of the clutch is achieved. In the preferred embodiment, one of the valves operates in response to impinging ambient air at a relatively low temperature and the other valve operates in response to sensed engine coolant temperature at a relatively high temperature.

REFERENCES:
patent: 2658400 (1953-11-01), Dodge
patent: 2974768 (1961-03-01), Hause
patent: 3559786 (1971-02-01), Long, Jr.
patent: 3968866 (1976-07-01), Leichliter et al.
patent: 3972399 (1976-08-01), Bopp
patent: 4056178 (1977-11-01), Detty
patent: 4064980 (1977-12-01), Tinholt

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