Introduction to the Clutch and classified ?

CLUTCHES 

The clutch is mechanical device, that is used to connect or disconnect the source of power form the remaining parts of the power transmission system at the will of  the operator . An automotive clutch can permit the engine to run without driving the car . This is desirable when  the engine is to be started or stopped or when the gears are to be shifted .

CLUTCHES ARE CLASSIFIED INTO THE FOLLOWING FOUR GROUPS ;

1. Positive contact clutch - They include square jaw clutch ,spiral jaw clutches and toothed clutches ,In these clutches power transmission is achieved by means of interlocking of jaw or teeth . Their main advantage is positive engagement and once coupled they can transmit large torque with no slip  .

The jaw are clutches have following advantage .

1. They do not slip and engagement is positive .

2. No heat is generated during engagement or disengagement .

2. Friction clutch - They include single and multi -plate clutch cone clutches and centrifugal clutches . In these clutches power transmission is achieved by means of friction between contacting surfaces . 

advantage of friction clutches ;

1. The engagement is smoothly made by gradual increase in the normal force .

3. Electromagnetic clutch - They include magnetic particle clutches , magnetic hysteresis clutches power transmission is achieved by means of the magnetic field .

4. Fluid clutch - In these clutches power transmission is achieved by means of  hydraulic pressure . A fluid coupling provides extremely smooth starts and absorbs shock .