| 摘要 |
1. Variable speed transmission having a pulley with a moveable flange and receiving a transmission belt (3) and provided with an adjustment system comprising, on the one hand, means (6) for adjustment by blocking the moveable flange (11) with respect to the fixed flange (7) of this pulley (2) of the variable transmission, comprising two coaxial cam elements which are longitudinally complementary (14, 15) and mounted in superimposed relationship, one of these elements (14) being fixed and the other of these elements (15) being moveable and connected to this moveable flange (11) by means of a roller bearing (21), and, on the other hand, means for maintaining this moveable flange (11) in a position spaced from this fixed flange (7) comprising a control device (16) performing a relative rotary movement between these two cam elements (14, 15) for causing their cams to slide on each other (18, 19) in one sense of rotation to remove these two elements (14, 15) axially from each other in order to approach the fixed (7) and moveable (11) flanges of the pulley (2), and in an opposite sense of rotation to approach these two elements (14, 15) axially in order to remove the flanges (7, 11) of this pulley (2) of the variable transmission from each other upon selection of its operating speed, characterized in that the two axial cam elements are mounted within the space between the moveable flange (11) and a fixed abutment (5), the fixed cam element (14) being restrained by this abutment, and the control device (16) comprises a pinion (26) and rack (25) device. |
