Fan drive with a fluid-friction clutch

Internal-combustion engines – Cooling – Automatic coolant flow control

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F01P 702

Patent

active

056178174

ABSTRACT:
A fan drive with a fluid-friction clutch comprises an input shaft with input disk and a clutch housing. This housing is rotatably mounted on the input shaft and bears a fan driven via the input shaft by a motor vehicle engine and serves to deliver cooling air through a cooling circuit radiator and/or a refrigerant circuit condenser. To increase the fan speed, the fluid-friction clutch housing is driven through at least one freewheel by an electric motor attached to the vehicle. The driving (switching on and off) by the electric motor takes place as a function of the fan speed n.sub.2 and/or as a function of the temperature of the coolant or refrigerant. A second freewheel may be arranged in the engine-side drive train. The clutch hub is extended axially by a cylindrical hub piece that accommodates, via a ball bearing, an input-shaft stub that bears the second freewheel, which is secured in a hollow hub that drives the input disk via the input shaft.

REFERENCES:
patent: 3363734 (1968-01-01), Sabat
patent: 3853098 (1974-12-01), Ishikawa et al.
patent: 3894521 (1975-07-01), Sakasegawa et al.

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