Friction Discs

Friction discs are precision-engineered, annular components integral to torque limiters, a type of mechanical safety clutch. They consist of one or more pairs of discs with high-friction surfaces that are pressed together under axial force (typically via springs or pneumatic pressure). When the transmitted torque exceeds a preset threshold, the discs slip relative to each other, decoupling the drive and driven sides to prevent damage from overload, shock loads, or jams. They provide reliable, repeatable torque limitation and can be reset automatically or manually after the overload condition is cleared.

Friction discs operate on the principle of controlled frictional engagement. Under normal operating conditions, axial force clamps the discs together, creating frictional torque that transmits power. When torque exceeds the preset limit (determined by the axial force and friction coefficient), the frictional force is overcome, causing the discs to slip. This slippage limits the transmitted torque to the preset value, protecting downstream components. Once the overload is removed, the discs re-engage automatically if the design permits, or require manual reset.