| 摘要 |
A continuously variable ratio drive of the type with expandable conical pulleys for internal combustion engines comprising a pair of pulleys, one being a drive pulley and the other being a driven pulley, between which a transmission belt (31) slides, the drive pulley (32) in turn comprising an axially mobile element (32'), and a fixed element (32'') both in the form of frusto-conical discs facing towards each other so as to constitute a groove in which the belt (31) slides, the mobile element (32') being operatively connected to an electric motor (61) driven and controlled by an electronic unit and suitable for causing the axial movement of the mobile element (32') through engagement of cylindrical pins (37), housed in holes formed in an outer bush (47) placed in rotation by the electric motor (61), in helical slots (40) formed in an inner bush (38) bound axially to the outside of the mobile element (32') <IMAGE>
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