Patent ID: 7963878

Claim:
A hypocycloidal gear train for transmitting power between two coaxial shafts, one of which is the driving shaft ( 1 ) and the other the driven shaft ( 2 ), so that the input speed transmitted by the driving shaft ( 1 ) is different to the output speed transmitted to the driven shaft ( 2 ), comprising: a transmission element ( 3 ) to be rigidly connected to the driving shaft ( 1 ), at least one ring gear ( 4 ), having toothing inside and being fixed relative to all of the other components of the hypocycloidal gear train, a planetary gear ( 5 ), having several sets of toothing, one of these sets of toothing meshing with the ring gear ( 4 ) toothing, the planetary gear being rotatably connected to the transmission element ( 3 ) and under the action applied to the planetary gear by the transmission element during driving shaft ( 1 ) rotation, the planetary gear rolls without sliding on the ring gear ( 4 ) toothing, so that the points of the toothing of the planetary gear are forced to move along a hypocycloid, a plurality of gears ( 6 ), each of which meshing on one side with a respective set of toothing of the planetary gear ( 5 ) and on the other side being designed to be rigidly connected to the driven shaft ( 2 ), a slider part ( 8 ), inserted between the plurality of gears ( 6 ) and the driven shaft ( 2 ) and able to move along the longitudinal direction of the driven shaft ( 2 ) between a plurality of positions, in each of which said slider part on each occasion one of the gears ( 6 ) and the driven shaft ( 2 ); each gear ( 6 ) having two sets of toothing, specifically a first set of toothing designed to mesh with the planetary gear ( 5 ) and a second set of toothing designed to be mechanically coupled to the driven shaft ( 2 ) and also each of the gears ( 6 ) being placed with respective central connecting bodies one on the other and being rotatably supported one on the other.