Download Machine Design - Design of Clutches PDF

TitleMachine Design - Design of Clutches
TagsClutch Transmission (Mechanics) Mechanics Machines
File Size827.7 KB
Total Pages12
Document Text Contents
Page 7

Brown Hills College of Engineering & Technology Machine Design - 1

Sachin Chaturvedi Lecturer in Department of Mechanical Engineering 7
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When the clutch pedal is pressed down, its linkage forces the thrust release bearing to move in
towards the flywheel and pressing the longer ends of the levers inward. The levers are forced
to turn on their suspended pivot and the pressure plate moves away from the flywheel by the
knife edges, thereby compressing the clutch springs. This action removes the pressure from
the clutch plate and thus moves back from the flywheel and the driven shaft becomes

On the other hand, when the foot is taken off from the clutch pedal, the thrust bearing moves
back by the levers. This allows the springs to extend and thus the pressure plate pushes the
clutch plate back towards the flywheel.

If the torque due to this frictional force exceeds the torque to be transmitted, then no slipping
takes place and the power is transmitted from the driving shaft to the driven shaft.

 Multi-disk Clutch

A multiple disc clutch, as shown in Fig. e, may be used when a large torque is to be
transmitted. The inside discs are fastened to the driven shaft to permit axial motion. The
outside discs are held by bolts and are fastened to the housing which is keyed to the driving
shaft. The multiple disc clutches are extensively used in motor cars, machine tools etc.

Fig: e

 Cone Clutch

A cone clutch, as shown in Fig. f, was extensively used in automobiles, but now-a-days it has
been replaced completely by the disc clutch. It consists of one pair of friction surface only. In a
cone clutch, the driver is keyed to the driving shaft and has an inside conical surface or face which
exactly fits into the outside conical surface of the driven.

The driven member resting on the feather key in the driven shaft, may be shifted along the shaft
by a forked lever provided at B, in order to engage the clutch by bringing the two conical surfaces
in contact.

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