Main gear (Audi A4 B5)

The gearbox and final drive – almost like in all front-wheel drive vehicles – are located in a common housing in the Audi A4. The power transmitted from the engine to the gearbox is fed to the final drive via one small and one large pinion. The synchronized gearbox housing is bolted to the large pinion. This housing contains interlocking bevel gears, two of which are connected to the drive shafts.

While we are driving in a straight line, both front wheels roll at the speed of rotation of the large pinion of the main transmission. The bevel gears of the synchronized gearbox housing, also rotating at the same speed, are at rest. When turning, the outer wheel travels a longer distance than the inner wheel. Now the bevel gears are activated: the accelerated rotation of the outer wheel and its bevel gear acts through both bevel gears of the transmission on the bevel gear on the inner side of the turn, which rotates correspondingly more slowly.

[The original article is posted on the resource AUDImanual.ru]