When the clutch is disengaged, the pedal 1 rotates on the axle 20 and pulls the cable behind the earring 2 with the upper shoulder, which turns the clutch release fork through the lever 12. The fork moves the clutch with the release bearing along the guide sleeve. Initially, the gap between the clutch release bearing and the pressure spring petals is selected, this ends the free travel of the clutch pedal (clutch fork lever). During the working stroke of the pedal, the clutch release bearing acts on the petals of the pressure spring, bending it on the support rings 14 (see fig. 57). The outer edge of the spring stops pressing on the pressure plate and the driven disc moves away from the surface of the flywheel, i.e., the transmission of torque to the gearbox stops. At the same time, when the clutch is disengaged, a servo mechanism is activated, reducing the force applied to the pedal. This is due to the fact that when you press the pedal, the force from the lever is transmitted to the pusher 26 (see fig. 58) and thrust washer 25. When they move, the spring 24 is compressed and the shoulder decreases «H1», and hence the moment holding the pedal in its original position. When the connection point with the servo lever passes through «dead» point arises a shoulder «H2», and hence the moment that creates additional effort on the pedal. This moment will increase with further movement of the pedal to a certain value.
When the clutch pedal is released, under the action of the compressed spring 24, the pedal returns to its original position, and the release spring of the lever 12 retracts the fork and clutch with the clutch release bearing to their original position. Pressure spring 12 (see fig. 56), taking its original shape, moves the pressure plate towards the flywheel 7 and the driven disk is clamped between the surfaces of the flywheel and the pressure plate.
In a clutch with a backlash-free drive, in the initial position of the pedal, the clutch release bearing rests against the petals of the pressure spring, which leads to their joint rotation. The force of pressing the bearing does not cause deflection of the pressure spring on the support rings and the clutch discs remain closed. When the clutch is released, the pedal stroke immediately begins, as a result of which the magnitude of the full stroke of sadness decreases. The full stroke should be 125...130 mm and should not exceed 160 mm, after which it must be adjusted with nuts 6 and 7 (see fig. 58).
The backlash-free clutch release bearing is mounted with a small radial clearance on the clutch, which allows it to «swim», i.e. self-install. This increases the durability of the contact pair: bearing and pressure spring.
Despite the constant preload of the bearing to the petals of the pressure spring, its performance is maintained for the entire run until the overhaul. This is ensured by improved sealing of the bearing and the absence of dynamic loads on it when the clutch is disengaged. The latter is typical for drives with a gap between the bearing and the pressure spring petals, when at the moment the clutch is released, the bearing perceives sharply increasing loads.