9. Coupling

Specifications

Data
Value
Coupling drive
Hydraulic
Diameter of frictional slips (external x internal)
215х145 mm
Internal diameter of the main cylinder
20,64 mm
Internal diameter of the working cylinder
15,87 mm
Clutch plate thickness
8,5±0,3
Free wheeling of a pedal of coupling
6–13 mm
Coupling pedal course
145 mm
Coupling pedal height
166,9 mm
Minimum admissible distance to heads of rivets at extreme wear of frictional overlays of a clutch plate
1,1 mm
Distinction of height of the ends of a diaphragm spring
0,5 mm
Gap between the piston and the working cylinder of coupling
0,15 mm
Gap between the piston and the main cylinder of coupling
0,15 mm

The recommended lubricants

Elements
Lubricant
Contact surface of the bearing of switching off of coupling and support of a fork of switching off of coupling
CASMOLY L 9508
Internal surface of the bearing of switching off of coupling
CASMOLY L 9508
Internal surface of the cylinder of switching off of coupling, piston and cuffs
DOT 3 or DOT 4 brake fluid
Clutch plate vents
CASMOLY L 9508
Internal surface of the main cylinder of switching off of coupling, piston and cuffs
DOT 3 or DOT 4 brake fluid
Pusher of the main cylinder of coupling
SAE J310a, NLGI No. 2
Shaft of a pedal of coupling and plug
J310a, NLGI No. 1
Coupling switching off fork
CASMOLY L 9508
Vents of a main shaft of the transmission
CASMOLY L 9508

Moments of an inhaling, N • m

Data
Value
Coupling pedal arm
19–28
Coupling pedal support to the main cylinder
8–10
Connecting nuts of fastening of a pipe of coupling
13–17
Coupling pipe arm
4–6
Bandage of a broad tank
13–17
Coupling switching off cylinder
15–22
Bolt of fastening of the cylinder of switching off of coupling
20–25
Casing with a press clutch plate
15–22

General information

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, at 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.