Centrifugally controlled two-speed accessory drive.

摘要

A accessory drive for operation of one or more automotive vehicle accessories to provide a two-stage operation depending on the engine speed, the drive including a gear box (10) secured to the face of the accessory (11) and having an input shaft (24) driven by a pulley and belt from the engine, an output shaft (34) driving the accessory, and a planetary gear set connecting the shafts. The gear set includes a sun gear (37) connected to the output shaft (34), a ring gear (39) rotatably mounted in the gear box and a planet carrier (41) rotatable with the input shaft and mounting a plurality of planetary gears (45) between the sun gear and ring gear. A cone clutch (47) engages the ring gear to ground it through a Belleville spring (54), piston (57) and fulcrum, and centrifugal weights (63) act to unground the ring gear; a one-way clutch between the shafts allows the output shaft to overrun the input shaft when the ring gear is grounded and rotate the output shaft with the input shaft as a unit when the ring gear is ungrounded.