Abstract: The present invention refers to a speed change mechanism with magnetic torque transmission using two stages of epicyclic transmission, with four bases, containing each base at least one magnetic poles ring, the first stage has one base with orbital motion and one base reciprocal to the housing concentric with the two shafts, the second stage has one base with rotational motion concentric with the lower rotation shaft and one base with orbital motion reciprocal to the orbital motion base of the first stage, the torque transmission of each stage is done by the magnetic poles rings of each base, and the transmission ratio change is done by changing the pair of magnetic poles rings that are transmitting torque.

Abstract: The present invention refers to a speed change mechanism with magnetic torque transmission using two stages of epicyclic transmission, with four bases, containing each base at least one magnetic poles ring, the first stage has one base with orbital motion and one base reciprocal to the housing concentric with the two shafts, the second stage has one base with rotational motion concentric with the lower rotation shaft and one base with orbital motion reciprocal to the orbital motion base of the first stage, the torque transmission of each stage is done by the magnetic poles rings of each base, and the transmission ratio change is done by changing the pair of magnetic poles rings that are transmitting torque.

Abstract: The present invention refers to a mechanism for mechanical speed reducer or in some cases for speed increase, in which for each reducing stage there are two sprockets disposed laterally and in parallel position between themselves, moreover one of them in orbital motion provided by a eccentric cam reciprocal to the reducer input element and the other sprocket disposed concentric with the input element and the torque transmission between the sprockets is done through a chain.

Abstract: The present invention refers to a mechanism for mechanical speed reducer or overdrive in which for each reducing stage there are two pulleys or sprockets disposed laterally and in parallel position between themselves, moreover one of them in orbital motion provided by a eccentric cam reciprocal to the reducer input element and the other pulley or sprocket disposed at the same input element center and the torque transmission between the pulleys or sprockets is done through a belt.

Abstract: It is an epicyclic gear system for use in speed reducer or overdrive, however using an inner pulley, an external ring and a driving belt or a tire instead of using toothed gears. The system particularity is an inner pulley drivingly coupled to an external ring and the torque transmission between the inner pulley and the external ring is done through a belt or a tire, as either the inner pulley or the external ring has orbital motion.