The gearbox and final drive – as in almost all front-wheel drive vehicles – are located in the Audi A4 in a common housing. The power transmitted from the engine to the gearbox enters the main gear through one small and one large gear. A synchronized gearbox housing is screwed onto the large gear. This housing contains bevel gears interlocked with each other, two of them are connected to the drive shafts.
While we are driving in a straight line, both front wheels roll at the speed of the large final drive gear. The bevel gears of the synchronized gearbox housing, also rotating at the same speed, are at rest. On a turn, 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 through both bevel gears of the transmission affects that bevel gear on the inner side with respect to the turn, which rotates correspondingly slower.
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