Automatic gearbox based on elastic rings

摘要

The present invention relates to a mechanical system wherein the speed ratio between two shafts, a drive shaft (V m ) and a resistant shaft (V r ), is determined by the load that the resistant shaft (V r ) applies on said drive shaft (V m ). This mechanical system is applicable, for example, as an automatic gearbox in motor vehicles. Eccentric rollers (1, 1a) are fitted on shaft (V m ) at diametric positions, which act on rings (2, 2a) which, in turn, engage in a connection wheel (3) placed inside said rings (2, 2a) and integral with a shaft (V r ). Within elastic rings (2, 2a) a pair of pulleys (4, 4a) are fitted which, in turn, are assembled at an arm (7) that displaces said pulleys (4, 4a) between at least two allowed positions which are symmetric with respect to shaft (V m ), allowing to reverse the rotation direction of rings (2, 2a) and, therefore, the shaft (V r ).