What is the function of the diaphragm spring in a diaphragm spring clutch?
2 Answers
The diaphragm spring serves as both the pressure spring and the release lever, resulting in a simple structure, compact axial dimensions, fewer components, and lightweight. The diaphragm spring clutch offers advantages such as easy operation, automatic adjustment of clamping force, stable spring pressure at high speeds, and uniform pressure distribution on the pressure plate. The diaphragm spring itself combines the functions of the pressure spring and the release lever, reducing the number of components and overall weight. This greatly simplifies the clutch structure and significantly shortens the axial dimensions of the clutch. The diaphragm spring exhibits excellent nonlinear characteristics, allowing for minimal change in clamping force even when the friction plate wears to its limit, while also reducing the pedal force required to disengage the clutch, making operation easier. Advantages of the diaphragm spring clutch: The installation direction of the diaphragm spring in a pull-type diaphragm spring clutch is opposite to that of traditional clutch structures, relocating the support point to the large end of the diaphragm spring. When engaged, the large end of the diaphragm spring is supported on the clutch cover, with the middle section pressing against the pressure plate. Pulling the release bearing outward separates the flywheel, achieving clutch disengagement.
When I was young and drove manual transmission cars, the diaphragm spring in my clutch was a real helper. It mainly ensured that when I pressed the clutch pedal, the pressure plate could steadily disconnect the power between the engine and the transmission, making my gear shifts smooth and jerk-free. If it failed, shifting gears would become rough or slip, easily burning out the clutch disc. I remember once driving in the mountains, the old car's clutch was making a lot of noise, but after replacing the diaphragm spring, hill starts became much smoother. It also reduced vibrations, making long trips less tiring for my legs and feet. After decades of driving, this component has proven adaptable to all kinds of road conditions—far more durable than old-style coil springs. However, regular transmission maintenance is essential because wear accelerates diaphragm spring fatigue—checking oil levels and clutch clearance is key. Overall, it makes driving safer and more reliable. Don’t underestimate this little spring; without it, the car just wouldn’t run properly.
