Importance

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Abstract

The assembly includes an input member having a radial surface and fitted integrally with a coaxial drive shaft; and a pulley fitted coaxially to and idle with respect to the drive shaft and having two half-pulleys connected to each other to rotate integrally and move axially with respect to each other, and which engage a drive belt. There is also provided a thrust-clutch member, which is connected to the drive shaft so as to rotate integrally with and move axially with respect to the drive shaft, and is located adjacent to the second half-pulley. The thrust-clutch member is adapted to move its radial surface axially into contact with the second outer radial surface of the pulley, and simultaneously moves the entire pulley to bring the first outer radial surface of the pulley into contact with the radial surface of the input member, so as to make the radial surfaces frictionally integral with each other, and exerts axial thrust on the two half-pulleys so as to determine the axial distance between them in direct relation to its own axial position; the thrust-clutch member having a position, at a maximum distance from the input member, in which the radial surfaces are detached. There is also provided a control device for varying, on command, the axial position of the thrust-clutch member.

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First Claim