When we slowly release the clutch pedal, the diaphragm spring start to push the pressure plate. If the clutch is opened: the crankshaft (1) + flywheel (2) + clutch cover (8) + diaphragm spring (5) + pressure plate (4) + release bearing (7, external ring) are rotating, while the clutch disc (3) + release bearing (7, internal ring) + gearbox input shaft (6) are stationary (if a gear is engaged and the vehicle stopped). The pushing force of the diaphragm spring on the pressure plate (4) is removed an the clutch disc (3) is not pressed anymore on the flywheel. When the vehicle driver presses the clutch pedal, the clutch bearing (7) presses the interior part of the diaphragm spring (5). This means the amount of axial load applied by the pressure plate will reflect on the power transmitted.Image: Clutch components (left – closed clutch, right – opened clutch) The amount of working pressure applied is also determined by how much the clutch pedal is pressed. This is the engaged condition when the disc touches the flywheel.
This is why the engine can run without moving.Īnd if the clutch pedal is completely released, the moveable friction disc slides forward on the shaft to the flywheel.
As there is no axial load applied by the pressure plate hence there is no power/torque transmission applied. If the clutch pedal is complete press, the moveable friction disc moves back from the shaft which disengaged from the flywheel. The load is applied by the pressure plate which is connected to multiple helical springs or single diaphragm spring. The moveable disc which is splined on crankshaft moves back and forth with the aid of the clutch pedal. This is to say the more the axial load the more the power transmission and the less the axial load, the lesser the power transmission. The amount of torque applied to determine the amount of axial load that is applied to the friction disc. The clutch consists of two different plates, one is mounted to the flywheel and the other moves over the crankshaft. It works perfectly fine that no torque/power is transmitted until the friction plates touch each other. The working principle of a clutch is quite interesting and easy to understand.
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