Question

Describe working of centrifugal clutch with neat sketch.

Answer 1

Centrifugal clutch- 

Working of Centrifugal Clutch: Centrifugal clutch works on the principle of centrifugal force. When the engine is started, the speed of the driving shaft is less, so the centrifugal force is also less. Therefore, shoes (flyweights) do not move outwards and torque is not transmitted to the rear wheel. As the speed of engine increases, the centrifugal force also increases. At certain engine speed, the shoes fly off outwards due to increased centrifugal force and they come in contact with the driven member. Now both the driving and driven members rotate together and the clutch is said to be engaged. Thus the engine torque is transmitted to the rear wheel. When the engine speed decreases, the centrifugal force also decreases. Now the shoes return back to their original position due to spring force which results in a disengagement of the clutch and torque is not transmitted to rear wheel. 

OR

Working of centrifugal clutch:- Fig. Shows schematic arrangement of centrifugal clutch. As the speed increases the weight A flies, therefore operating the bell crank lever B which presses the plate C. This force is transmitted to the plate D by means of springs E. The plate D containing friction lining is thus pressed against the flywheel F therefore engaging the clutch. Spring G serves to keep the clutch disengaged at low speed. The stop H limits the amount of centrifugal force.