Fluid friction clutch

Details Fluid friction clutch Fluid friction clutch

1986-04-21

1987-06-30

Friedman, Carl D.

192 clutches and power-stop control

Clutches

Fluent material

192 82T, 192 85R, F16D 3500

Patent

active

046763554

ABSTRACT:
The fluid friction clutch comprises a clutch input part drivable about a rotation axis and a clutch output part rotatable coaxially in relation to the clutch input part. The clutch output part together with the clutch input part defines at least one shear gap. A cover which forms a cavity enclosing at least the region of the shear gap is filled partially with viscous fluid and otherwise with gas. The gas-filled volume of the cavity contains less than 18 percent of oxygen by volume, preferably not more than 5 percent of oxygen by volume, in order to preclude a chemical reaction of the viscous fluid with the oxygen under thermal overloading which limits the utility of the viscous fluid. To reduce the proportion of oxygen either the cavity is evacuated or it is filled with a substantially oxygen-free protective or noble gas.

REFERENCES:
patent: 3215235 (1965-11-01), Kamm
patent: 3400796 (1968-09-01), Savins et al.
patent: 4488628 (1984-12-01), Kluna et al.
patent: 4610341 (1986-09-01), Hauser et al.

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