Since 1994 of release
Repair and car operation
+ Running gear
+ Regular servicing
+ Exhaust system
+ Cooling system
+ Fuel tank and the fuel pump
+ The air filter and channels всасывания
+ Injection system
- Transmission and the main transfer
Noise in a transmission
Electronic control by a transmission
The main transfer
Check of cuffs of power shafts
The help at malfunctions
+ Suspension bracket of wheels and steering
+ Wheels and tyres
+ The electrotechnical equipment
+ Ignition system
+ The alarm equipment
+ Tools and devices
+ Heating and ventilation
+ Body details
Search of malfunctions
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In Audi A4 two various models of an automatic transmission are used for installation: first, developed VW a transmission «AG-4» for the four-cylinder engine without a turbo-supercharging, secondly, designed ZF a transmission «5 HP 18» for the six-cylinder engine. As it is already clear on a designation, it is a question in one case of a four-speed transmission, in other case – about five-step.
Main principles of functioning
The basic link of all automatic transmissions are so-called planetary complete sets. They consist of a gear wheel round which three other gear wheels rotate. From above the ring with an internal teeth is put on. Each pair from these elements is connected in a set of gear gear wheels and forms an own small two-speed transmission. In these transmissions the way of their switching is ingenious. Transfer switching is carried out at the expense of keeping or liberation of details of the planetary complete set. It becomes without interruption of a stream of force. Keeping and liberation provide lamellar couplings and lamellar brakes with a hydraulic drive.
The twisting moment hydrotransformer
Transfer of force of the engine to a transmission is carried out by means of a liquid. The engine actuates the turbine in the twisting moment hydrotransformer. The liquid in the hydrotransformer, resulted in rotation, by means of located between them лопаточного the directing device can actuate also the wheel of the turbine connected to a transmission. Between the turbine rotating according to turns of the engine, and a turbine wheel on a transmission input always there is a distinction among turns. In a start of motion it the biggest, in process of increase in speed the difference in number of turns between the turbine of the pump and the transmission turbine decreases more and more. But in a traditional automatic transmission still there is some "backlash". In our transmissions the twisting moment hydrotransformer перемыкается in a range of 3rd and 4th transfer and to 4th and 5th, i.e. Between the engine and an automatic transmission rigid connection dominates. It allows to lower the fuel expense.