Heavy-duty truck clutch discs are core power coupling components in the transmission system, responsible for efficiently transmitting the engine's substantial torque under demanding conditions while enabling smooth engagement and complete disengagement of power. Their performance is directly linked to the reliability, operational availability, and driving safety of heavy trucks under high-load operations such as full-load hauling, uphill climbing, and frequent starts and stops. Therefore, they must possess exceptional wear resistance, high-temperature tolerance, and strong torque load capacity.
A complete heavy-duty truck clutch disc assembly primarily consists of four components: the friction linings (made from heavy-duty composite or sintered metal materials to provide highly stable friction), the core plate (a high-strength steel carrier that integrates key components), the torsional damper (an internal spring-damping system designed to buffer engine torsional vibrations and shocks), and the splined hub (which connects to the transmission input shaft to transmit power). Together, these components form a robust and functionally integrated unit.
Its working principle is based on the clutch disc switching between three states relative to the flywheel and the pressure plate:
（1）During engagement, it is clamped into a rigid unit, enabling full power transmission;
（2）During disengagement, the clamping force is released, completely cutting off power to allow for gear changes;
（3）During partial engagement (or slippage), controlled friction allows for smooth and progressive power transfer, ensuring stable vehicle starting and low-speed control.
