6.1.2. Features of a design

Fig. 6.1. Coupling: 1 – flywheel of a bent shaft; 2 – the conducted disk; 3 – press spring; 4 – amplifier of a case of coupling; 5 – forward bearing of a main shaft of the transmission; 6 – main shaft; 7 – quencher of tortional fluctuations; 8 – coupling switching off bearing; 9 – coupling switching off bearing fork; 10 – working cylinder of switching off of coupling; 11 – the valve for removal of air; 12 – hose; 13 – coupling case; 14 – fork support; 15 – press disk

The one-disk, dry, constantly closed coupling with the central press diaphragm spring (fig. 6.1) is installed on the UAZ Hunter cars.
Press the disk is mounted in the steel stamped casing attached by bolts to an engine flywheel.
The conducted disk is established on vents of a main shaft of the transmission and clamped by a diaphragm spring between a flywheel and a press disk.
The bearing of switching off of coupling of the closed type which is not demanding lubricant during operation, напрессован on the coupling is installed on the directing plug of a cover of the bearing of a main shaft and moves on it the fork located in a coupling case.
The UAZ Hunter cars are equipped with the hydraulic drive of switching off of coupling consisting of the main and working cylinders, a pedal of coupling, a tube and a hose.
The hydraulic drive of switching off of coupling provides transfer of effort from a pedal to a coupling switching off fork. When pressing a coupling pedal the piston of the main cylinder moves, blocking a compensation opening and forcing out liquid via the pipeline in the working cylinder. The piston of the working cylinder through a rod influences an external shoulder of a fork of switching off of coupling which moves the bearing of switching off of coupling on the directing plug. The bearing wrings out a diaphragm spring, and press the disk ceases to nestle on a flywheel. Coupling is switched off.

Useful tips
In order that coupling served long and smoothly, do not hold constantly a leg on a coupling pedal. This addiction is got often during driving instruction in driving schools for fear not to manage to switch off coupling during a car stop. Besides bystry fatigue of the leg which is all the time over a pedal, coupling appears though a little, but is squeezed out, and the conducted disk at the same time revolves and wears out. Besides, though the release bearing is also calculated on work in the mode of continuous rotation, at the pedal pressed even slightly it is under loading and its resource decreases.
For the same reason we do not recommend to keep long coupling in the switched-off state (for example, in traffic jams). If it is not necessary to start at once, to include neutral position of the transmission better and to release a pedal.
If during the movement by sharp pressing an accelerator pedal turns sharply grow, and then fall a little and the car begins to accelerate, coupling demands repair.