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What is the working principle of a diaphragm spring clutch?

2 Answers

MadisonFitz

09/02/25 2:57am

The working principle of a diaphragm spring clutch is as follows: Through the friction between the flywheel, pressure plate, and the contact surface of the driven plate, the power is transmitted to the driven plate. When the driver depresses the clutch pedal, the mechanical linkage causes the large end of the diaphragm spring to move the pressure plate backward, thereby separating the driven part from the driving part. Additional information: 1. Introduction to diaphragm spring clutches: A diaphragm spring clutch replaces conventional coil springs and release lever mechanisms with a diaphragm spring, and since it is centrally located, it can also be considered a central spring clutch. 2. Structural components of a diaphragm spring clutch: A diaphragm spring clutch consists of four main parts: the driving part, the driven part, the pressure mechanism, and the operating mechanism.

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SanRowan

09/14/25 5:16am

The working principle of a diaphragm spring clutch is quite simple, and I'm just an ordinary person who often drives manual transmission cars. When you press the clutch pedal, the hydraulic system or cable pushes a release bearing, which presses against the center point of the diaphragm spring, causing the disc-shaped spring to deform and bend. This action makes the pressure plate separate from the flywheel, cutting off the engine power. When you release the pedal, the spring's tension presses the pressure plate and flywheel together again, restoring the power connection. The key lies in the unique design of the diaphragm spring—it's conical in shape, unlike the old-style coil springs with multiple components, ensuring more even pressure distribution, smoother gear shifts without jerking, and an easier driving experience. This type of clutch is used in most modern vehicles, including cars and trucks, and is simple to maintain—typically requiring inspection for fatigue deformation and slippage only after 100,000 kilometers or more. If you feel stiffness or hear unusual noises when pressing the pedal while driving, the spring might be faulty, and it's crucial to check it promptly to avoid accidents.

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