Clutches
What is a clutch?
The clutch is a
mechanical device, which is used to connect or disconnect the source of power
from the remaining parts of the power transmission system at the will of the
operator. An automotive can permit the engine to run without driving the car.
In the operation of
clutch, the conditions are as follows;
Initial condition: the
driving member is rotating and the driven member is at rest.
Final condition: Both
members rotate at the same speed and have no relative motion.
How does clutch works?
Classification of clutches
1.Positive contact
clutches: they include square jaw clutches; spiral jaw clutches and toothed
clutches. In these clutches power transmission is achieved by means of
interlocking of jaws or teeth. Their main advantage is positive engagement and
once coupled, they can transmit large torque with no slip.
2.Friction clutches:
they include single and multi-plate clutches, cone clutches and centrifugal
clutches. In these clutches, power transmission is achieved by means of
friction between contacting surfaces.
3.Electromagnetic
clutches: they include magnetic particle clutches, magnetic hysteresis clutches
and eddy current clutches. Power transmission is achieved by means of the
magnetic field. These clutches have many advantages, such as rapid response
time, ease of control, smooth start and stops.
4.Fluid clutches
and couplings: in these clutches power transmission is achieved by means of
hydraulic pressure. A fluid coupling provides extremely smooth and absorbs
shock.
