Diaphragm clutches use a circular conical spring, aptly called a diaphragm spring, to apply a clamping force to the pressure ring, which is a heavy cast iron circular plate that pushes the clutch disc toward the flywheel. The flywheel is a solid piece of metal that is bolted to the crankshaft of the engine. The clutch disc has splines that engage the transmission input shaft.

The clutch cover is the outer casing of the clutch and contains the clutch assembly. It is usually made of stamped steel bolted to the flywheel. Some racing clutch covers are made from machined billet aluminum for stiffness and weight. When the diaphragm spring is bolted tightly to the flywheel, it gets squashed under the cover. This presses the pressure ring and disc against the flywheel, creating a direct coupling from the engine to the transmission. Power can now flow from the engine to the transmission. In this state, the clutch is said to be engaged.

The drive belt transfers torque from the pressure ring to the clutch cover. They also help the pressure ring pull away from the clutch disc when the clutch is disengaged.

The compression of the diaphragm spring against the pressure ring and disc is what provides the clamping load that prevents the clutch disc from slipping when the engine is energized. The pressure ring is attached to the lid by thin flexible metal strips called drive straps. The drive belt transfers the engine's torque from the pressure ring to the cover and helps the pressure ring retract, keeping it on the diaphragm spring to keep it from rattling when the clutch disengages.

Taizhou Benwo Auto Parts Co., Ltd. is a Clutch Cover Manufacturer from China. The company is mainly engaged in Truck Pressure Plate, selling Truck Clutch Disc