What is the function of a diaphragm spring?
2 Answers
Diaphragm spring clutches are clutches that use diaphragm springs instead of conventional coil springs and release lever mechanisms. Due to their central placement, they are also referred to as central spring clutches. The diaphragm spring is a conical spring plate made of thin spring steel, featuring a certain taper and numerous evenly distributed radial slots in its middle section. Specific details are as follows: 1. Principle: In a pull-type diaphragm spring clutch, the installation direction of the diaphragm spring is opposite to that of the traditional push-type structure, and the support point is moved near the large end of the diaphragm spring. During engagement, the large end of the diaphragm spring is supported on the clutch cover, pressing the middle part against the pressure plate, and pulling the release bearing outward away from the flywheel to achieve clutch disengagement. 2. Advantages of the pull-type diaphragm spring: It eliminates intermediate support components and either does not require a support ring or uses only one, making the structure simpler, more compact, with fewer parts and reduced weight. The pull-type diaphragm spring presses against the pressure plate in the middle, allowing for the use of a larger-diameter diaphragm spring under the same pressure plate size, thereby increasing the clamping force and torque transmission capacity without increasing the pedal force. For transmitting the same torque, a smaller-sized structure can be used.
Speaking of the role of the diaphragm spring, I've been in the auto repair industry for over 20 years and frequently encounter clutch issues. This diaphragm spring is primarily responsible for applying pressure to the clutch disc, keeping it tightly pressed against the flywheel, so that engine power can be transmitted to the transmission. When you press the clutch pedal, the spring deforms and contracts, releasing the pressure and allowing the clutch to disengage, making it easier to shift gears. When you release the pedal, the spring snaps back, maintaining the engaged state for smooth driving. Compared to the old-style coil springs, diaphragm springs are more effortless, durable, and less prone to fatigue or deformation. However, over time, they can wear out—for example, if the spring's tension weakens, the clutch may slip, making acceleration feel sluggish or the pedal feel softer. I've found that regular maintenance is crucial. During inspections, check for cracks or deformations in the spring; it’s usually addressed when replacing the clutch. I recommend having a professional shop inspect it every 50,000 kilometers to prevent minor issues from turning into major repairs. Also, avoid riding the clutch (keeping it partially engaged for too long) during normal driving, as this accelerates spring wear.
