Audi A4

Since 1994 of release

Repair and car operation

Audi А4
- Running gear
   Protection of passengers
   Full zinc covering
   Full drive
   Drive concepts on all wheels
   Distributive torsen-differential
   Dynamics of movement on dry road
   Maintenance instructions of cars quattro
   The mechanism of blocking of differential
   Additional works on maintenance service
   Impellent compartment
+ Regular servicing
+ Engines
+ Turbo-supercharging
+ Exhaust system
+ Cooling system
+ Fuel tank and the fuel pump
+ The air filter and channels всасывания
+ Injection system
+ Coupling
+ Transmission and the main transfer
+ Suspension bracket of wheels and steering
+ Brakes
+ Wheels and tyres
+ The electrotechnical equipment
+ Ignition system
+ Illumination
+ The 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 – the differential case;
4 – a flange/kardannyj a shaft (for a drive
The back bridge);
5 – a worm of a drive of a back axis;

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

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

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

The name торсен proceeds from firm on manufacture of transmissions Gleason in which this differential has been invented. Its name is derivative of English letters Torque Sensing that means feeling a twisting moment. Thus, it already consists in this concept the function description, as:

  • The differential transfers the raised force to a drive of that axis, at which best coupling with a ground;
  • It occurs so effectively (it is caused by a design) that this axis can transfer in 3,5 times большее effort, than other axis.
  • But at equally good properties of a ground equivalent distribution of a drive to a forward and back axis is carried out, i.e. There is no preference of one axis caused by a design.

Functioning principle

Torsen-differential work is based on a principle of a worm drive and uses its basic 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 an angle of slope of a worm, i.e. At a worm a lot of flat or few abrupt coils;
  • Example of a flat worm with high degree of blocking is the jack in which the knee on which the worm operates, 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 of 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.