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Clutches

2. 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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3. 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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4. 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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5. Disc clutches
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6. 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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7. Cone clutch
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8. • 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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9. Centrifugal clutch
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10. 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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11. Positive Contact Clutch
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