Patent ID: 8671800

Claim:
Device configured to transmit a torque from a drive shaft ( 4 ) to two driven shafts ( 6 , 6 ′), wherein the drive shaft ( 4 ) is mechanically connected to a wheel ( 8 ), and first engagement rotors ( 12 , 12 ′) are coaxially arranged beside the wheel ( 8 ) so that the wheel ( 8 ) is located between the first engagement rotors ( 12 , 12 ′) and can rotate together with them, wherein the first engagement rotors ( 12 , 12 ′) are provided with an axial hole in which a driven shaft ( 6 , 6 ′) is rotatably arranged, wherein the first engagement rotors ( 12 , 12 ′) can be mechanically coupled or uncoupled with second engagement rotors ( 13 , 13 ′) coaxially arranged beside the first engagement rotors ( 12 , 12 ′), by extracting or retracting, respectively, at least one mobile tooth ( 14 ) which can rotate in a seat made in the first engagement rotors ( 12 , 12 ′), each driven shaft ( 6 , 6 ′) being keyed to a second engagement rotor ( 13 , 13 ′), wherein driving rotors ( 18 , 18 ′) are coaxially and rotatably arranged around the driven shafts ( 6 , 6 ′) between the wheel ( 8 ) and the first engagement rotors ( 12 , 12 ′) and are provided with a braking mechanism ( 19 , 19 ′), so that the relative rotation of the driving rotors ( 18 , 18 ′) with respect to the first engagement rotors ( 12 , 12 ′) causes the extension or the retraction of the at least one mobile tooth ( 14 ) of the first engagement rotors ( 12 , 12 ′) according to the direction of the relative rotation, wherein the wheel ( 8 ) is provided with a plurality of longitudinal holes in which longitudinal pins ( 11 ) are inserted so that one or both ends of the longitudinal pins ( 11 ) protrude from both sides of the wheel ( 8 ), the longitudinal pins ( 11 ) being inserted in longitudinal holes made in the first engagement rotors ( 12 , 12 ′) and the driving rotors ( 18 , 18 ′) being provided with longitudinal openings ( 21 ) crossed by the longitudinal pins ( 11 ), so as to allow a limited relative rotation between the wheel ( 8 ) and the driving rotors ( 18 , 18 ′).