Automatically controlled continuously variable transmission

A device for the dynamic coupling between two propeller shafts, with possibility of variation in the transmitted torque and speed values, characterized in that it comprises:

• a driving hub coaxially linked to one shaft;
• a differential gear having primary planet wheels rotatably interconnected with respect to the driving hub and operatively engaged between a first and a second sun wheel to distribute the twisting moment transmitted by the driving hub between said sun wheels;
• a cycloidal gearing having a crown gear interconnected with the first sun wheel and a plurality of auxiliary planet wheels rotatably interconnected with the second sun wheel and meshing with said crown gear;
• a trochoidal kinematic mechanism having a guide member linked to the crown gear in coaxial relation and a plurality of interconnecting elements each eccentrically carried by one of said auxiliary planet wheels and slidably engaging in a trochoidal rolling track formed in the guide member and extending according to the path described by each interconnecting member when the respective auxiliary planet wheel rolls on the crown gear;
• actuator means to generate opposite tangential forces on the auxiliary planet wheels and crown gear, which forces interact with a motive power applied by the driving hub to the primary planet wheels, in order to transmit a twisting moment to a second shaft connected to the guide member.