2 types of clutches are:
There are 2 types of clutches: (i) Positive Engagement or direct clutches (ii) General Engagement Clutches.

The types of friction clutch are:
The different types of friction clutches are:
- Cone Clutch.
- Multi plate clutch.
- Centrifugal clutch.
- Single plate clutch.
- Semi centrifugal clutch.
- Diaphragm clutch.
Cone Clutch:
This clutch consists of contact surfaces in the form of cones. There are two con es internal and external cones. A frictional lining of a wire and asbestos composition are used for fitting an internal cone. To hold the cones together in position, a large and strong coil spring is used.
The torque is usually transmitted from the engine to the flywheel and internal cone to the splined gearbox shaft when the clutch is engaged, A foot operated pedal or lever system is applied to pull out the internal cone and overcome the spring pressure resulting in separation of contact surfaces or disconnection of the drive. A two-way cone clutch is generally employed in an overdrive gear. the friction material is provided on both the inside and outside facing of the cone. The moving cone acts as the male member to hold the cone stationary while the female member of the clutch drives the cone of the input speed.
Advantages of cone clutch:
(1) The normal force acting on the friction surfaces is larger than the axial force as compared to single plate clutch.
(2) It is smaller in size than single plate clutch.
(3) Less force is required to press the clutch pedal.
Disadvantages of cone clutch:
(1) There is possibility of stickiness of male cone to female cone of flywheel, so it becomes difficult to disengage the clutch.
(2) Small amount of wear of contact surfaces causes “slip” between the two cones.
Applications:
(1) In early days it was used in larger vehicles such as buses and trucks.
(2) It is used on no gear small two wheelers.
(3) It is used to operate the hoist, cranes etc. which are operated by Engine Generator set.
Single plate clutch:
Construction:
Single plate clutch is the most common type of clutch used in motor vehicles for producing a quick dis engagement. Basically, it consists of a clutch a disc, pressure plate and a cover plate bolted to the engine flywheels. In order to remove complete assembly from the flywheels cover plate bolts may be removed. A simplified sketch of a single plate clutch is shown in the figure. Friction plate is held between the flywheel and the pressure plate. There are springs attached circumferentially which provide axial force to keep the clutch in the engaged position. The friction plate is mounted on a hub which is splined from inside and free to slide on the gear box shaft. A clutch pedal is provided to pull the pressure plate against the spring force whenever it is required to be disengaged. When the clutch pedal is pressed, the pressure plate is moved to the right against the force of spring. With the movement of the pressure plate the friction plate is released and the clutch is disengaged. In actual practice, the construction of the clutch differs. The pressure plate, the springs the release levers and the cover form a sub-assembly called the cover assembly which can be mounted directly to the engine block.
Advantages:
(i) Simple in construction.
(ii) Good heat dissipation from single plate.
(iii) Due to single pate the gear changing is easier.
(iv) This type of clutch has better torsional vibration absorbing capacity.
Advantages of multiplate clutch:
(a) It has high torque transmission capacitor.
(b) The overall size of the clutch is smaller.
(c) Smooth drive transmission.
(d) Due to this type of clutch there is less wear and tears.
Disadvantages:
(a) The design of this clutch is complicated.
(b) Maintenance is difficult.
(c) The cost n this clutch is more.
Applications:
(1) Since it has high torque transmission capacity, it is used in racing car.
(2) They are used in two wheelers like Bajaj scooter, motor bikes etc.
Diagram:
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