Main gear elements
1 - differential case; 2 - driven bevel gear; 3 - output shaft of the gearbox; 4 and 7 - satellite disks; 5 - spacer sleeve; 6 - planetary wheel; 8 - satellite axis; 9 - spacer ring and thrust ring.
The gearbox and final drive with a differential mechanism are located in the same housing. The torque transmitted from the engine to the gearbox is directed through the small and large gears to the final drive. The casing of the differential mechanism is screwed to the large gear wheel. This housing contains 4 coupled bevel wheels, two of which are connected to the drive shafts. As long as the vehicle is driving straight ahead, both front wheels rotate at the speed of the large final drive sprocket. The conical wheels of the differential mechanism rotating at the same speed, on the contrary, stand motionless. When turning, the outer wheel travels a longer distance than the inner wheel. This is where the bevel wheels come into play: the faster rotation of the outer wheel and its bevel wheel affects the bevel wheel on the inside of the curve via both bevel gears, which turns correspondingly slower. This alignment is necessary as it prevents the wheels from spinning when cornering. However, the differential mechanism plays a negative role when the drive wheel slips on slippery ground. In this case, no force is transferred to the other front wheel and the machine does not move.