Audi A4

since 1994 of release

Repair and car operation

A4 Audi
- Running gear
   Protection of passengers
   Full zinc covering
   Full drive
   Drive concepts on all wheels
   Distributive torsen-differential
   Dynamics of movement on the dry road
   Maintenance instructions of quattro cars
   Mechanism of blocking of differential
   Additional works on maintenance
   Impellent compartment
+ Regular servicing
+ Engines
+ Turbo-supercharging
+ exhaust System
+ cooling System
+ Fuel tank and fuel pump
+ Air filter and absorption channels
+ injection System
+ Coupling
+ Transmission and main transfer
+ Suspension bracket of wheels and steering
+ Brakes
+ Wheels and tires
+ Electrotechnical equipment
+ ignition System
+ Lighting
+ Alarm equipment
+ Tools and devices
+ Heating and ventilation
+ body Details
+ Salon
Search of malfunctions
Technical characteristics

Distributive torsen-differential

1–a drive to the forward bridge;
2–a hollow shaft (a drive to a transmission);
3–differential case;
4–the flange/driveshaft (for a drive
back bridge);
5–worm of a drive of a back axis;

7–axis of worm wheels;
8–worm wheels;
9–worm of a drive of the forward bridge.

The distributive (central) differential serves for alignment of forward and back transmission. (Differentials of a lobby and a back axis work irrespective of it.)

It takes place – outside not perceived as separate knot – behind on a mechanical transmission. Engineers speak: it is integrated.

The name торсен proceeds from firm on production of transmissions of Gleason in which this differential was invented. Its name is derivative of the English letters Torque Sensing that means «feeling a torque». Thus, it already consists in this concept the function description, as:

  • the differential transfers the increased force to a drive of that axis, at which best coupling with soil;
  • it occurs so effectively (it is caused by a design) that this axis can transfer in 3,5 times bigger effort, than other axis.
  • but at equally good properties of soil equivalent distribution of a drive to a lobby and a back axis is carried out, i.e. there is no preference of one axis caused by a design.

Functioning principle

Work of torsen-differential is based on a principle of a worm drive and uses its fundamental principles:

  • the worm drive can be designed in such a manner that will possess high or low ability of blocking (blocking size in this case repeatedly increased force from which transfer should be turned);
  • the size of value of blocking depends on a tilt angle of a worm, i.e. at a worm there are a lot of flat or few abrupt rounds;
  • example of a flat worm with high extent of blocking is the jack in which the knee which the worm affects, lifts the car, but the car never can actuate a knee at the expense of the weight.


At the expense of an intelligent arrangement in the sum of eight worm wheels and 12 gear wheels in a combination to the differential case, hollow shaft, a power shaft ahead and a power shaft the best performance of function about which it was told in the penultimate paragraph is behind reached.