Mechanical reducer device with high reduction ratio

A mechanical reducer device with a reduction ratio, the mechanical reducer comprising:

• a box-like case provided on an input wall thereof with an input opening and on an output wall thereof with an output opening;
• a rotatably-supported input shaft entering said case through said input opening, the input shaft being configured to be brought into rotation at an input angular speed;
• a rotatably-supported output shaft exiting outward from said case through said output opening, the output shaft being mechanically connected to the input shaft and being configured to provide an output angular speed that is reduced with respect to said input speed;
• and
• a plurality of reduction members mechanically connecting the output shaft to the input shaft, the reduction members comprising, arranged inside said case,
• an input movable drive group mechanically connected to said input shaft, the input movable drive group being conducted in rotation by the input shaft and comprising
• a first secondary toothed wheel, and
• a second secondary toothed wheel constrained to the first secondary toothed wheel,
• a reference fixed drive group comprising a reference toothed wheel which engages said first secondary toothed wheel, and
• an output movable drive group mechanically connected to said output shaft and comprising an output toothed wheel which engages the second secondary wheel,
• wherein the reference toothed wheel and the output toothed wheel have a number of teeth differing from each other by at least one tooth,
• the first secondary toothed wheel and the second secondary toothed wheel have a number of teeth differing from each other by one tooth, and
• wherein the input movable drive group comprises
• a rotor having cylindrical conformation and fit at the end of said input shaft, and
• at least one pair of first and second secondary shafts, mounted fixed on said rotor, parallel to each other and being extended from the rotor perpendicular to an axis of said input shaft, said first and second secondary toothed wheels being respectively rotatably supported by said first and second secondary shafts and both comprising an external portion with cylindrical toothing and an internal portion with conical toothing, said external portions with cylindrical toothing engaging each other,
• said reference toothed wheel has conical toothing, is fixed to the case coaxial with respect to the output shaft and input shaft, and engages with the internal portion with conical toothing of said first secondary toothed wheel, and
• said output toothed wheel has conical toothing, is mounted at the end of said output shaft and internally with respect to said reference toothed wheel, and engages with the internal portion with conical toothing of said second secondary toothed wheel.