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Clutches

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Clutches •Clutch is a one of the form of coupling.• Clutches is used to transmit the power from driving shaft to driven shaft of machine which may be required to start or stop frequently.•It is so designed that the two members may be engaged or disengaged whenever required either by a hand operated device or automatically by the action of some power driven devices.

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Types of clutches

clutches

mechanical

positive contact clutche

jaw clutch

toothed clutch

friction clutches

disc clutch

cone clutch

centrifugal clutch

pneumatic

hydraulic

electromagnetic

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Disc clutches• This type of clutch consists of two flanges, one

flange is rigidly to the driving shaft and other flange fitted to the driven shaft.

• Single disc clutches are used in automobiles.• When large torque transmission is required the

multi disc clutch are used.• Multi disc clutch has more number of contact

surfaces discs on driving and driven shaft.

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Disc clutches

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Cone clutch

• The cone clutch consists two cones , one internal cone fixed to the driven shaft and another cone fitted on the driven shaft.

• The operating lever used only for disengagement of the clutch.

• The main advantage of cone clutch over the disc clutch is very simple and required less axial pressure to disengaged the clutch.

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Cone clutch

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• It consists of a number of shoes on the inside of a drum or rim of the pulley.

• The upper surface of the shoes are covered with a friction material.

• The spider is fitted on the driving shaft.• When centrifugal force is equal to spring force, the shoe is

just floating.• But, when centrifugal force higher than the spring force, the

shoes moves outward and comes into contact with the driven member and pressure against it.

• The increase of speed causes the shoes to press harder and clutch transmit more power.

Centrifugal clutch

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Centrifugal clutch

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Positive Contact Clutch• It is consists of segmental projections on one of

the flange and corresponding recesses on other flange on the driven shaft.

• Driving flange rigidly keyed to the driving shaft while the other flange is keyed to driven shaft by splines so that it can slide on that shaft.

• The sliding flange engage with the fixed flange to transmit the motion and power from driving shaft.

• This clutch is used for the transmission of power in agricultural equipment like tractor, thresher, etc.

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Positive Contact Clutch

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Thank you