System for power transmission comprising coaxial shafts; a first pinion (2) integral with a first shaft (5), a second pinion (3) secured to a second shaft (6) coaxial to the first axis (5) and a pinion connection (4) meshing with the first pinion (2) and the second pinion (3) so that the first shaft (5) rotate in opposite to the second shaft (6), wherein said system (1) comprises sense; means floating support (7) and bearing means (8, 8 ') integrated into the body of the first pinion connection (4), through which a support shaft (9) having an outer end (10) rests on a fixed fulcrum (12, 12 ') and an inner end (11) attached to floating support means (7).
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