8. Coupling


1 – coupling pedal;
2 – main cylinder of coupling;
3 – working cylinder of coupling;
4 – coupling switching off bearing;
5 – coupling switching off fork;
6 – casing of coupling with a press disk;
7 – clutch plate;
8 – central bearing;
9 – flywheel

Coupling is located between the engine and the transmission and intended for separation and connection of the flywheel located on cranked to a shaft of the engine and a main shaft of the transmission.

Coupling consists of the conducted (frictional) disk, a casing of coupling with a press disk and a diaphragm spring, and the coupling switching off mechanism. The frictional disk consists of two ring frictional slips which are strengthened on a nave through damping springs.

The diaphragm spring mechanism creates effort which unites work of a flywheel, the press and conducted disks for ensuring joint rotation, in this case coupling joins and transfers torque from the engine to the transmission. Control of coupling is exercised of a coupling pedal.

Switching off of coupling is made as follows. As a result of pressing a pedal of coupling the piston in the main cylinder moves, compressing liquid which pressure on a hose is transferred to the working cylinder of coupling which piston in turn influences a coupling switching off fork. The fork of switching off of coupling moves the coupling switching off bearing which presses the center of a diaphragm spring, thus, releasing effort of inclusion on perimeter of a spring and moves press a disk back. At the same time the conducted disk then the shaft of the engine and a shaft of the transmission can rotate independently from each other is released.

From two parties of the conducted disk frictional slips are fixed. The leading part of a disk connects to a nave through details of a quencher of tortional fluctuations which provides elastic communication between them. The quencher of fluctuations reduces the dynamic loadings causing twisting (untwisting) of shaft of transmission which arise at sharp change of speed of the movement of the car, arrival on roughness of the road, sharp inclusion of coupling, and also owing to unevenness of torque of the engine. Elastic fluctuations of details of transmission lead to emergence of noise in mechanisms and units, and also to vibrations therefore damage of details is possible in case amplitude of elastic fluctuations reaches considerable sizes. For absorption of energy of elastic tortional fluctuations the quencher serves.