Fluid flow restriction path in viscous fluid clutch

Details Fluid flow restriction path in viscous fluid clutch Fluid flow restriction path in viscous fluid clutch

1977-04-05

1978-09-26

Hermann, Allan D.

192 clutches and power-stop control

Clutches

Fluent material

192 82T, F16D 3500, F16D 4325

Patent

active

041163184

ABSTRACT:
A viscous fan drive having a clutch member with a plurality of restricted fluid flow paths of a given cross sectional area communicating at one end with an element to pump fluid from the restricted flow path to a reservoir and at the other end with radially extending fluid flow paths having a greater cross sectional area than the restricted flow paths and transversing the shear area of the clutch. The restricted flow paths reduce the fluid flow outwardly of the shear area of the clutch member to reduce high speed pumpout and thus increase the speed of the fan when the drive is engaged. The flow paths have a constant cross sectional area, are circumferentially spaced about the clutch member, and transverse the lands and grooves area. The restricted flow paths have a stepped configuration radially outwardly of the flow paths to reduce fluid flow. Each restricted fluid flow path communicates with an axially extending opening transversing the clutch member radially outwardly of the stepped configuration. The openings communicate with a pumping surface on the clutch member which is closely spaced relative to the pump element.

REFERENCES:
patent: 3463282 (1969-08-01), Fujita et al.
patent: 3584716 (1971-06-01), Coty
patent: 3907084 (1975-09-01), Hall
patent: 3983981 (1976-10-01), Snodgrass et al.
patent: 4051936 (1977-10-01), Crisenbery et al.

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