Fluid friction clutch

Details Fluid friction clutch Fluid friction clutch

1988-06-06

1990-07-10

Braun, Leslie A.

192 clutches and power-stop control

Clutches

Fluent material

192 82T, F16D 3100

Patent

active

049401211

ABSTRACT:
Fluid friction clutches tend to operate discontinuously when the performance requirement is low and therefore the filling ratio in the working chamber is also low. This so-called "surging" is to be avoided. According to the invention, a forced guiding is provided for the clutch fluid from a front part of the working chamber into the rear part of the working chamber, and only then is the return flow provided to the storage chamber which is achieved by a sealing-off of the working chamber into these two areas by means of the clutch disk and by means of the arrangement of a fluid deflector with damming bodies at a part of the circumference. The resulting forced distribution of clutch fluid on both sides of the clutch disk permits a smooth operation of the clutch and, when pumping elements are arranged, also a reduction of the hysteresis. Fluid friction clutches of this type are particularly suitable for fan drives for cooling devices of motor vehicles.

REFERENCES:
patent: 4555004 (1985-11-01), Nakamura et al.
patent: 4627523 (1986-12-01), Light
patent: 4653624 (1987-03-01), Mader
patent: 4699258 (1987-10-01), Johnston et al.

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