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

Drive concepts on all wheels

Torsen-differentsial is based on a principle of a worm drive. The worm drive can be designed so that to provide more or less high extent of blocking. By figures are designated:

2–worm wheel.

Connected drive on all wheels

Until then the full drive was almost inseparably connected with concept of the cross-country vehicle. The concept of a full drive used in this family of cars, was simple:

  • In addition to a standard drive (the engine ahead, a drive behind) to a forward axis the second transmission by branch of transfer and the additional driveshaft was simply laid. Movement in a usual mode occurred to a standard drive, and only if it was demanded by road conditions, forward transmission of a drive was connected. This design with a connected drive on all wheels is used and today in cross-country vehicles.
  • Shortcoming: For movement on firm soil the drive on all wheels should be disconnected, as on turns forward wheels pass a bigger piece of a way, than back. Different frequency of rotation of wheels leads to an overstrain of transmissions.
  • Effect: the car copes hardly, on turns for removal of tension from a drive the wheel rubs with very small probuksovyvaniye through certain intervals – the car jumps up.

Constant drive on all wheels

When in the head the idea of a constant drive came to all wheels, it was necessary to think up a way of alignment which would not allow an overstrain of both drives of axes relatively each other. This problem is solved by so-called central differential.

Differentials are known long ago in automotive industry. They divide forces between the right and left driving wheel. In this case too alignment because, as we know, on turns the external wheel in relation to turn always passes a bigger piece of a way, than an internal wheel is necessary. This alignment is provided with axis differential. It provides an axis drive at simultaneous possibility of free rotation of both driving wheels relatively each other.

The one who coordinated in the winter on the way, knows insidiousness of a subject: the wheel standing on ice, is turned, the opposite wheel on rough soil does not transfer effort and costs.

One becomes clear: such differential is not necessary as central as the opposite case is necessary just. Force should go there where wheels can transfer you on soil, namely: where there is a paving with a stseplyaemost. And as it never happens known, distribution of force should be carried out automatically and and immediately. After various development stages of the blocking central differential with manual connection today the so-called distributive torsen-differential is built in the Audi Quattro models.