| 摘要 |
<p>The assembly includes an input member (10) having a radial surface (10a) and fitted integrally with a coaxial drive shaft (11); and a pulley (30) fitted coaxially to and idle with respect to the drive shaft (11) and having two half-pulleys (31, 32) connected to each other to rotate integrally and move axially with respect to each other, and which engage a drive belt (33). There is also provided a thrust-clutch member (40), which is connected to the drive shaft (11) 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 (40) is adapted to move its radial surface (40a) axially into contact with the second outer radial surface (32b) of the pulley (30), and simultaneously moves the entire pulley (30) to bring the first outer radial surface (31b) of the pulley into contact with the radial surface (10a) of the input member (10), so as to make the radial surfaces frictionally integral with each other, and exerts axial thrust on the two half-pulleys (31, 32) so as to determine the axial distance between them in direct relation to its own axial position; the thrust-clutch member (40) 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 (50) for varying, on command, the axial position of the thrust-clutch member (40). <IMAGE></p> |
