Clutch Disc

Function and Value

As the friction “mates” between the flywheel and the pressure plate, the clutch disc has the primary task of transmitting the engine torque to the transmission input shaft.

The main components are:
  • clutch disc 
  • clutch facings riveted in pairs (1)
  • splined hub (15)

The clutch disc also has several other tasks, which we briefly mention here:

It must allow for smooth take-off and fast gear changing. Keep engine vibrations away from the transmission and prevent transmission noise generated by gear rattle

The fulfillment of these tasks – an absolute “must” for the modern vehicles of today – requires a few additional components:

  • segments (3)
  • torsion damper (7–13)

The designs are selected according to vehicle type and requirements. The mode of operation can be displayed by “torsion damping graphs”, as shown in chart 2, below the clutch discs. The torsion angle of the torsion damper is plotted as a function of the given torque. The dashed/dotted line represents the theoretical torsional characteristic curve, while the shaded band shows the torsional characteristic curve when friction is taken into account (hysteresis).