VARIABLE-RATIO TRANSMISSION DEVICE

摘要

A variable-ratio transmission device is disclosed comprising: a support shaf t (1); an hollow shaft (5) rotatingly assembled onto the shaft (1); a support (9) assembled onto the hollow shaft (5) in a rotating way with respect to th e shaft around a slanted axis with respect to an axis of the support shaft (1) ; a plurality of rollers or teeth (10) arranged in a circular series on the support (9); a wheel assembled idle onto the shaft (1), equipped with a fron t toothing (11) adapted to be engaged by the rollers or teeth (10) assembled o n the support (9); a rotation of the hollow shaft (5) subjecting the support ( 9) to an orbital movement adapted to take the teeth or rollers of the support t o engage the toothing of the idle wheel (12); means adapted to establish a connection between the wheel (12) and a user to which motion is transmitted, wherein it provides means adapted to axially slide the support (9) or the wheel (12) with respect to the shaft (1).