The clutch or clutch assembly consists of a flywheel, the clutch disc, and the pressure plate, which connects the engine to a manual transmission.
- Stepping on a foot pedal disengages the clutch disc so that the engine can run without turning the wheels. It allows the driver to shift the transmission gear from one to another. When the torque transmitted by the clutch is smaller than the torque generated by the engine, the clutch will slip
- As a result, the facing of the clutch disc will wear faster. If it is too large, the clutch engagement shock will be large and will tend to cause the engine to stall when the clutch is engaged.
- The clutch disc, also known as friction disc, is a flat steel disc with a splined hub that slides on the transmission input shaft.
- A friction material on both sides of the clutch disc, similar to that in brake linings, allows the disc to be engaged gradually for smooth starts. It is also a driven disc about 12 inches or less in diameter that slides back and forth on the shaft splines.
- Strong springs squeeze the clutch disc between the flywheel and pressure plate to take up the shock engagement.
- The clutch disc is locked in place, the engine power passes from the flywheel to the clutch disc to the transmission input shaft, driving the vehicle in motion.