Fluid friction clutch

Details Fluid friction clutch Fluid friction clutch

1986-05-19

1987-03-31

Friedman, Carl D.

192 clutches and power-stop control

Clutches

Fluent material

192 82T, F16D 3100

Patent

active

046536256

ABSTRACT:
The temperature-controlled fluid friction clutch, suitable especially for a cooling fan, comprises a rotor which is arranged in a housing, rotatably in relation to the housing, forming at least one shear gap for the viscous fluid transmitting the torque. A scraper conveys the viscous fluid according to the dynamic pressure principle out of a working chamber containing the rotor into a reservoir chamber. The scraper is connected with the housing and lied radially opposite to the external circumference of the rotor, forming a scraper gap. The housing consists of a material the coefficient of thermal expansion of which is greater than that of the material of the rotor. In this way the scraper gap is enlarged with rising temperature, whereby the pump power of the scraper is reduced with rising temperature. The clutch unites good cold-start behavior with low temperature-actuation hysteresis in the operationally hot condition. '

REFERENCES:
patent: 3419122 (1968-12-01), Connelly
patent: 3463282 (1969-08-01), Fujita et al.
patent: 3858697 (1975-01-01), Brewer et al.
patent: 4086989 (1978-05-01), Spence
patent: 4116318 (1978-09-01), Crisenberg et al.
patent: 4271946 (1981-06-01), Bridge
patent: 4403684 (1983-09-01), Haeck
patent: 4437554 (1984-03-01), Haeck
patent: 4441599 (1984-04-01), Storz
patent: 4446952 (1984-05-01), Masai
patent: 4485902 (1984-12-01), Storz
patent: 4564093 (1986-01-01), Storz
patent: 4564094 (1986-01-01), Storz
patent: 4592456 (1986-06-01), Neugebauer

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