Patent ID: 6962097

Claim:
A mechanical transmission unit, having an input drive shaft ( 1 ) and two output driven shafts ( 6 and 7 ) that comprises: a first pair of bevel gears having a first bevel gear ( 2 a ) and a second bevel gear ( 2 b ), the first bevel gear being splined to the drive shaft ( 1 ), the second bevel gear ( 2 b ) being splined to a driven shaft ( 3 ), that is at right angle to the drive shaft ( 1 ); at the ends of the driven shaft ( 3 ), two identical differential units ( 5 ) are installed, from which the two output driven shafts ( 6 and 7 ) originate, a cogwheel ( 8 ) that is splined to the drive shaft ( 1 ) and gears with a couple of cogwheels ( 9 and 10 ) that are identical to the cogwheel ( 8 ), each of which is splined to the another pair of driven shafts ( 11 and 12 ), which are parallel and whose opposite sides lie near the drive shaft ( 1 ), a second pair of bevel gears ( 13 a and 13 b ) and a third pair of bevel gears ( 14 a and 14 b ), which lie near the opposite sides of the first pair of bevel gears ( 2 a and 2 b ) and are used to link differential gears ( 5 ) to their the another pair of driven shafts ( 11 and 12 ); two identical hydraulic units ( 15 ) respectively mounted on the another pair of driven shafts ( 11 and 12 ), each of them used to start two antithetical clutches ( 16 a and 16 b ), the former ( 16 a ) controls transmission of motion from the two cogwheels ( 9 and 10 ) to their respective driven shafts ( 11 and 12 ); whereas the second clutch ( 16 b ) prevents the free rotation of a frame ( 17 ) and the another pair of driven shafts ( 11 and 12 ), making them revolve in the same direction; it is also being provided that the three pairs of bevel gears ( 2 a and 2 b ; 13 a and 13 b ; 14 a and l 4 b ) are perfectly identical; the first bevel gear of the first pair ( 2 b ) is splined to the driven shaft ( 3 ) and lies upside down with reference to the two bevel gears ( 13 b and 14 b ) of the second and third pair.