192 clutches and power-stop control – Clutches – Operators
Patent
1978-04-28
1980-08-19
Herrmann, Allan D.
192 clutches and power-stop control
Clutches
Operators
192 80, 192 82T, F16D 2702, F16D 1310
Patent
active
042179769
ABSTRACT:
An electromechanical clutch for vehicle engine cooling fans includes a driving member mounted for rotation by the vehicle engine and a driven member rotatably mounted on the driving member. The driven member carries the engine cooling fan. One end of a metal band is connected to the driven member, and wraps circumferentially around the driving member in the direction of rotation of the latter. An electromagnetic coil comprising windings wound circumferentially around the driving member and rotatable therewith exert an electromagnetic force on the band when current is transmitted to the coil, drawing the band into engagement with the outer circumferential surface of the driving member, to thereby engage the clutch and cause the engine cooling fan to be rotated with the driving member. Because of the wrapping effect of the band when it engages the outer circumferential surface of the driving member, the electromagnetic force necessary to actuate the clutch is multiplied as the clutch is engaged through the servo action caused by the band wrapping around the driving member. The electrical signal is transmitted to the coil through a slip ring, and is controlled by conventional engine temperature and/or pressure sensors.
REFERENCES:
patent: 1077805 (1913-11-01), Collier
patent: 1886692 (1932-11-01), Kapitza et al.
patent: 2052846 (1936-09-01), Ryba
patent: 2955680 (1960-10-01), Caero
patent: 3129798 (1964-04-01), Rabinow
patent: 3491866 (1970-01-01), Birdsall
Antonis William N.
Canadian Fram Ltd.
Decker Ken C.
Herrmann Allan D.
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