Patent ID: 8382635

Claim:
Epicyclic reduction gear device comprising: a cylindrical housing ( 1 ), having an internal circumference equipped with at least a crown wheel ( 2 ); at least a first train-carrier ( 7 ) rotatable inside the housing ( 1 ) and supporting a first output shaft ( 13 ); at least a planetary first wheel set ( 3 a , 3 b , 3 c ), hinged on relative pins ( 6 a , 6 b , 6 c ) fixed at the first train-carrier ( 7 ) and provided with related toothed portions ( 9 a , 9 b , 9 c ) engaged with the crown wheel ( 2 ); a solar gear wheel ( 4 ) which is integral with an input shaft ( 10 ) and which is engaging with the planetary wheels ( 3 a , 3 b , 3 c ); said reduction gear device ( 12 ) having at least a first idle gear wheel ( 5 ) which is pivoted on the first train-carrier ( 7 ) and which engages two wheels ( 3 a , 3 b ) of the planetary wheels ( 3 a , 3 b , 3 c ) in order to allow force balancing.