Belt tensioner

Details Belt tensioner Belt tensioner

1984-04-09

1985-12-10

Novosad, Stephen J.

Endless belt power transmission systems or components

Means for adjusting belt tension or for shifting belt,...

474135, F16H 708

Patent

active

045577072

ABSTRACT:
A belt tensioning device for an endless drive belt for a vehicle accessories drive system. A bracket is adapted to be mounted on an engine in a stationary position adjacent the drive belt and has lever means pivotally mounted thereon. An idler pulley is rotatably mounted on the lever means and is movable into belt tensioning engagement by a torsional coil spring telescopically mounted about the pivot for the lever means. The pulley is mounted so that a radial center line through the peripheral belt receiving surface of the pulley also passes generally through the center of the lever means pivot to reduce the frictional force exerted on the pivot. A brake band ring is mounted between the bracket and lever means and is biased by the torsional spring into a camming engagement with the lever means to provide a damping force when the lever means attempts to move in either a belt tensioning or non tensioning direction. The damping force is proportional to the belt tensioning force throughout the tensioning range of the belt tensioner since the same coil spring provides both forces. The brake band has angled surfaces which move along complementary angled surfaces formed on the mounting bracket to provide an adjustable camming engagement therebetween.

REFERENCES:
patent: 1163891 (1915-12-01), Caverno
patent: 4069719 (1978-01-01), Cancilla
patent: 4270906 (1981-06-01), Kraft et al.
patent: 4285676 (1981-08-01), Kraft
patent: 4362525 (1982-12-01), Sproul
patent: 4472162 (1984-09-01), Hitchcock
patent: 4473362 (1984-09-01), Thomey et al.

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