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Working process of clutch

Jun 30, 2025

The operation of the diaphragm spring clutch can be divided into three processes: operation, separation, and engagement.
1. Working process. When the diaphragm spring is installed between the clutch cover and the pressure plate, the pre-compression deformation is generated to form the pressure on the pressure plate to compress the master and slave parts of the clutch, that is, the clutch is in the engaged state. The engine power is transmitted to the driven plate through the flywheel, clutch cover and pressure plate connected to the crankshaft, and then transmitted to the input shaft of the transmission through the spline sleeve of the driven plate. The working characteristics of this process are that the torque and speed transmitted by the master and slave parts of the clutch are the same, there is no speed difference between the master and slave parts, and there is no slip.
2. Separation process. The driver steps on the clutch pedal, the pedal moves to the left, the push rod moves to the left, and the diaphragm spring separation plate is pushed to the left through the cylinder and the working cylinder. Affected by this, the diaphragm spring uses the support pin fixed on the clutch cover as a fulcrum to move the large end to the right, and at the same time, the pressure plate is pulled to the right by the action of the separation plate. Finally, there is a gap between the driven plate and the flywheel and pressure plate, and the clutch is separated, and the clutch separation process ends.
The working characteristics of the clutch during the separation process are: after separation, the power and movement of the engine cannot be transmitted to the driven plate. The active part still keeps synchronization with the engine speed, while the driven part decreases rapidly.
3. Engagement process. The driver releases the clutch pedal and the pedal returns to its original position under the action of the return spring, while driving the push rod and the release bearing back to their original position. That is, the movement of the operating mechanism during the engagement process is the reverse process of the separation process. When a reserved gap appears between the release bearing and the diaphragm spring separation plate and the diaphragm spring presses the pressure plate against the driven plate again, the engagement process ends and the clutch resumes its power transmission function.
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