Cone clutch

It shows the cone clutch. It consists of two cones, internal and external cone. Friction material of a wire and asbestos are used for fitting on internal cone. The cones are held together in position by a large and strong coil spring. The torque is transmitted from the engine to the flywheel and internal cone to the splined shaft when the clutch is engaged. The foot operated clutch pedal is employed to pull out the internal cone and overcome the spring pressure during disengagement of the drive. Cone clutch was used for larger and earlier type vehicles but now it has become obsolete due to certain disadvantages.

Hydraulic clutch

It shows hydraulic operated clutch used in connector type of automatic transmission. The clutch action is applied by hydraulic pressure, while it is released by the spring action.

It consists of 4 or 5 set of clutch plates splined to the clutch hub driver by the input shaft. The plates attached to the drum are fitted alternately between the driving disc To form an apply chamber between the hub and the drum back. a piston is fitted between the drum hub and inside of drum. From openings in the drum hub, the oil enters the apply chamber. When the clutch is released the oil apply pressure is cut off and the piston is pushed back by the release spring. The movement of the pistons forces both ses of plates into contact due to the oil pressure on the clutch, producing a direct drive.

Semi centrifugal clutch

This clutch is similar to the centrifugal clutch with only difference that light clutch pressure springs exerting low pressure at idling speeds are used. The pressure between the plates is Increased with Increase in the speed of rotation of the clutch in Proportion to the pressure requirements by means of centrifugal weights linked to the pressure plate Figure shows the action of the rotating weights which trend to move the pressure plate towards the flywheel and the ends of the release levers are moved back against the throw bearing. Relatively light clutch pressure springs exerting low pressure at the idling speed is enable depression of the clutch pedal for shifting of gear.