• In the general arrangement it consists of a disc which has frictional material on both its side,this is called clutch plate.
  • The clutch plate is held between the engine flywheel and pressure plate.
  • The friction material on the friction plate is made up of asbestos (fiber).
  • These friction material are used to transmit power from engine flywheel to clutch shaft.
  • The friction plate hub is attached to the clutch shaft by splines.
  • As in this case the driven assembly has only one clutch plate, it is called single plate clutch.


 As the clutch pedal is applied the the the pressure plate is pulled against the spring pressure, this causes DISENGAGEMENT OF CLUTCH.

When the clutch pedal is released the spring pressures the pressure plate to attach to frictional lining of clutch plate, this connects the transmission of engine and power is delivered.

  • Reliable and less pedal movement is needed.

           CONE CLUTCH

1) Friction plates
2) Shaft
3) Frictional lining
4) Spring
5) Pressing the paddle engages or disengage the clutch
6) Rotation of the plates

  • In these type of clutches the friction surfaces are in form of cone as indicated in figure.
  • In engaged condition cone is completely engages in the other or say one cone is completely inside the other.
  • The driving shaft or say engine shaft transmits engine torque to splined gear box through inner cone.
  • When the clutch pedal is applied or pressed,the inner and outer cone disengages and hence transmission of power is stopped.
  • The springs keeps the inner cone pressed against the outer cone under normal condition.

  • Normal force is greater than axial force, hence engagement is excellent of clutch.


  • Small amount of wear can be fetal.
  • Cone angle should not exceed 20 degree, otherwise it will be difficult to engage.


When the clutch pedal is pressed, the transmission of engine power is disengaged from rest of the wheels. Generally the angle of inclination of inner cone with outer cone is about 12.5 degrees. At this point the inner cone is not in contact with outer cone. As the clutch pedal is released due to spring force the inner cone is pressed towards the outer cone and it gets engaged to it with friction lining present between then. As the driving shaft rotates it rotates the driving shaft. The presence friction lining rotates the driven shaft at same speed as that of driving shaft without slip.



  • The biggest advantage of such clutch is that this can be operated without clutch pedal.
  • The vehicle can be stopped even in geared position without stalling the engine.
  • Only acceleration is required in this type of operation. Speed is the factor on which gear selection takes place.

It consists of :-

  • Circular plate
  • Shoes (centrifugal weight) with frictional lining on outer edge. 
  • Hub
  • Springs
  • Driven shaft

As the driving shaft rotates, due to centrifugal force (force in outward direction) the shoes (centrifugal weight) makes contact with driven drum (hub) with help of frictional lining. The hub starts rotating with the same speed as that of driving drum. This is complete engagement of clutch.

When the speed decreases the spring forces the the shoes to move inward, in this case the contact between the hub and driving drum is lost. This is complete disengagement of clutch.


  • No clutch pedal is needed for engagement and disengagement of gear.
  • Ease to the driver
  • Mopeds
  • Scooty.

Next Post »