Patent ID: 8409039

Claim:
A variable ratio centrifugal clutch driving assembly for use in a continuously variable transmission to connect with a driven assembly by means of an endless belt, the clutch driving assembly comprising: a rotatable shaft; a first rotatable member comprising a first sheave mounted on the shaft for rotation therewith and axially stationary thereon; a second rotatable member comprising a second sheave mounted on the shaft for rotation therewith and axially movable relative to the first sheave to variably control the radial position of the endless belt disposed therebetween; a third rotatable member mounted on the shaft for rotation therewith and axially stationary thereon; a first group of plural flyweights pivotally mounted on the second rotatable member and arranged to move radially outward with increasing rotational velocity of the shaft, each flyweight of the first group having formed thereon a first group cam surface to effect predetermined first and second modes of movement of the second sheave with respect to the first sheave, each of said first group cam surfaces being positioned to engage with a corresponding first group cam engaging member disposed on the third rotatable member to effect said first and second modes of movement; and a second group of plural flyweights pivotally mounted on the third rotatable member and arranged to move radially outward with increasing rotational velocity of the shaft, each flyweight of the second group having formed thereon a second group cam surface to effect only the predetermined first mode of movement of the second sheave with respect to the first sheave, each said second group cam surface being positioned to engage with a corresponding second group cam engaging member disposed on the second rotatable member to effect said first mode of movement.