Audi A4, S4
since 2000 release
Repair and operation of the car
Audi A4, S4
+ Governing bodies and methods of safe operation
+ Current leaving and service
+ Cooling systems, heating and air conditioner
+ Power supply systems, release and decrease in toxicity of the fulfilled gases
+ Systems of electric equipment of the engine
+ Manual box of gear shifting
+ Automatic transmission
- Coupling, power shafts and differential
Removal, installation and check of coupling
Removal and installation of the bearing
Removal of air from a coupling drive hydraulic system
+ Power shafts of wheels
+ Models with the full drive of wheels
+ Brake system
+ Suspension bracket and steering
+ Onboard electric equipment
Flywheel, basket and disk of coupling
On the considered models one-disk dry coupling with a diaphragm spring is established.
Coupling consists of a basket with a press disk, the conducted disk, the bearing of switching off of coupling and the hydraulic drive.
The basket of coupling is connected by bolts to a flywheel which is in turn fixed on cranked to an engine shaft. Between a press disk and a flywheel there is a conducted coupling disk which nestles on a flywheel a press disk. The conducted disk of coupling is connected through shlitsevy connection with primary shaft of a transmission.
By pressing a pedal of coupling with the help of a hydraulic actuator the bearing of switching off of coupling presses a spring of a press disk. Thus the disk unloads press and the conducted disk does not nestle on a flywheel any more. Power communication between the engine and transmission interrupts.
Coupling of all models with RKPP has the hydraulic drive. Working liquid is brake fluid which arrives from the general tank of brake fluid.
At each inclusion and switching off of coupling owing to friction there is a wear of frictional overlays of the conducted disk. The conducted disk is the wearing-out coupling element. Its average service life makes over 100 000 km. Speed of wear depends on loading (the movement with the trailer) and management style the car. Coupling does not demand service, since it self-established.
The majority of engines is equipped with a two-mass flywheel. Such flywheel has the spring damping system allowing to extinguish the tortional fluctuations arising during the operation of the engine. Besides, thus noise level on low turns decreases. The coupling disk at such flywheel consists of a nave, the conducted payment and frictional slips. The damping springs are not established.