Coupling is located between the engine and a transmission and intended for short-term separation and smooth connection of a cranked shaft of the engine and a primary shaft of a transmission that is necessary for трогания the car from a place and for a gear change without noise and risk of damage of details.
Fig. 8.1. Coupling: 1 – a flywheel; 2 – a coupling disk; 3 – press a disk; 4 – the bearing of deenergizing of coupling; 5 – a fixing spring; 6 – a plug of deenergizing of coupling; 7 – a hairpin with a spherical finger; 8 – a protective cover
On all models dry one-disk coupling which consists of conducted and press disks of coupling, central диафрагменной
springs, a casing and the bearing of deenergizing of coupling (fig. 8.1
) is established
The conducted disk of coupling freely moves on шлицах a primary shaft of a transmission and is clamped between a flywheel and a press disk effort which is created central диафрагменная by a spring. From two parties of a conducted disk приклепаны frictional overlays. The conducted disk of coupling incorporates to a nave through details гасителя крутильных fluctuations. Necessity гасителя крутильных fluctuations is caused by the following.
At sharp change of speed of movement of the car, arrival on roughness of road, sharp inclusion of coupling, and also owing to non-uniform work of the engine in car transmission there are the dynamic loadings causing a twisting (раскручивание) of shaft of transmission. Non-uniformity of a twisting moment of the engine can cause considerable overloads in transmission owing to occurrence крутильных fluctuations and a resonance at coincidence of the frequencies, transferred loadings to frequencies of own fluctuations of transmission. Elastic fluctuations of transmission result not only in noise occurrence in mechanisms and units, but also to dangerous vibrations, and sometimes and to breakages of details when the amplitude of fluctuations reaches the big size. For energy absorption крутильных fluctuations it is necessary гаситель.
Drive of deenergizing of coupling the hydraulic. The bearing of deenergizing of coupling is established from the forward party of a transmission on муфте coupling deenergizings. The bearing will mix up a plug of deenergizing of coupling. By pressing a coupling pedal the piston in the main cylinder moves and compresses a liquid which on a hose arrives in the working cylinder of coupling. Under pressure the piston of the working cylinder of coupling, moving, puts in action a plug of deenergizing of coupling. The plug of deenergizing of coupling moves the bearing which influences a spring of a press disk and takes away press a disk from a conducted disk of coupling. Coupling is regulated automatically.
Before replacement of components which have obviously failed, that продиагностировать malfunction of coupling and its drive, execute following preliminary checks:
Check up level of a brake liquid in a tank of brake system which also serves as the tank for a hydraulic drive of coupling.
If level below demanded, add a liquid and check up hydraulic system on absence of leaks of a brake liquid.
At engine work idling and the gear change lever in neutral position press a pedal of coupling and in some seconds include any transfer, thus from a transmission it should not be audible any noise. If there is a raised noise at transfer inclusion, probably, press the disk and-or a coupling disk have defects.
For check of full deenergizing of coupling start up the engine, tighten a lay brake, press a coupling pedal so that it did not reach a floor on 10–15 mm, and some times switch on and off the first transfer. If transfer joins hardly, check up a course of a pusher of the main cylinder of coupling and liquid level in a tank of brake system.
Visually check up the plug of a pedal of the coupling, located in the top part of a pedal, on absence excessive люфта and jammings.
From below the car check up that the plug of deenergizing of coupling is established on a hairpin with a spherical finger.