One-way acting sprag clutch with centrifugal disengagement from

Details One-way acting sprag clutch with centrifugal disengagement from One-way acting sprag clutch with centrifugal disengagement from

1990-03-01

1991-11-12

Lorence, Richard

192 clutches and power-stop control

Clutches

Automatic

192 451, 192104B, F16D 4107, F16D 4314

Patent

active

050640372

ABSTRACT:
A one way acting sprag clutch is disclosed of the type automatically disengaging the sprags from an outer raceway at a predetermined rotative speed of the inner raceway to reduce wear during overrunning, in which the sprags are of an upright shape and are formed with a rocker portion having asymmetric rocker lip portions creating an unbalanced mass. The unbalanced mass causes increased tilting movements of the sprags overcoming the energizing force of the springs at the predetermined rotative speed of the inner raceway and liftoff of the outer end of the sprags from the outer raceway. The upright shape allows a complete complement of sprags to be employed to achieve high torque capacity. The rocker lip portions have abutment surfaces facing the adjacent sprags, which surfaces move into abutment when the sprags move to an overloaded wedging condition to provide an antirollover feature.

REFERENCES:
patent: 2477176 (1949-07-01), Gruenberg et al.
patent: 2881886 (1959-04-01), Troendly et al.
patent: 3302761 (1967-02-01), Zlotek
patent: 3545581 (1970-12-01), Kent
patent: 3702649 (1972-11-01), Giese et al.
patent: 3844391 (1974-10-01), Hallerberg
patent: 4360093 (1982-11-01), Wakabayashi et al.
patent: 4867292 (1989-09-01), Hartig
Stovicek, D. R. "New Backstop Clutch Line." Power Transmission Design (Feb. 1987), pp. 22-23.

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