Friction Clutch by Nitin

1. THAKUR SHIVKUMAR SINGH MEMORIAL
ENGINEERING COLLEGE
MECHANICAL DEPARTMENT
MACHINE COMPONENT DESIGN (ME-602)
FRICTION CLUCTCH
NITIN ENGLE
(0884ME171013)
GUIDED BY:
PROF. BHARAT PATIL
PREPAIRED BY:

2. CONTENT
• Introduction to clutch
• Typesof clutch
• Disc clutch
Singleplateclutch
Multi plateclutch
• Cone clutch
• Centrifugal clutch

3. WHAT IS CLUTCHES ?
•A Clutch is a mechanical device that engages and disengages the
power transmission , especially from driving shaft to driven shaft.
•In the simplest application, clutches connect and disconnect two
rotating shafts (drive shafts or line shafts). In these devices, one
shaft is typically attached to an engine or other power unit (the
driving member) while the other shaft (the driven member) provides
output power for work.

4. TYPES OF CLUTCHES
1)Mechanical clutches
2)Pneumatic clutches
3)Hydraulic clutches
4)Electromagnetic clutches
Mechanical clutches
1)Positive contact clutches
i. jaw clutches
ii. toothed clutches
2)Friction clutches
i. Disc clutches
• Single plate clutches
• Multi plate clutches
ii. Cone clutches
iii. Centrifugal clutches

6. SINGLE PLATE CLUTCH

7. i. USED IN CARS AND LIGHTVEHICLES.
ii. IT HAS ONLY ONE CLUTCH PLATE WHICH IS MOUNTED ON
THE SPLINES OF THE CLUTCH SHAFT.
iii. WHEN CLUTCH IS IN ENGAGED POSITION, THE CLUTCH
PLATE REMAINS GRIPPED BETWEEN FLYWHEELAND
PRESSURE PLATE. FRICTION LININGS ARE PROVIDED ON BOTH
THE SIDES OF CLUTCH PLATE.

8. Single Plate Clutch
•W=total axial load
•R1=External radius of clutch plate
•R2=internal radius of the clutch plate
•P=intensity of pressure between contacting surfaces.
•µ=coefficient of friction between contacting surfaces
1R
R1

9. Single Plate Clutch
•Consider a elemental ring of radius ‘r’ and
thickness δr on the contacting surface.
therefore,
•Area of the ring on contacting surface is,
•Axial load on the ring is,
δW=pressure×Area of the ring
δW  p 2π r δr

10. Single Plate Clutch
•Torque transmitted by single plate clutch is
obtained by considering following two
assumptions
(a)uniform pressure theory
(b)uniform wear theory

11. Single Plate Clutch
•Total torque transmitted by single plate clutch can
be obtain by integrating Equation
(a)uniform pressure theory:
•Assuming that the intensity of pressure over the entire
contacting surface area is constant,
Then, p=constant

12. Single Plate Clutch
(b) Uniform Wear Theory
•In this theory, we are considering that wear which
take place is uniform over the entire contacting
surface i.e.
P.r=constant
P.r=C
P=C/r …...(3)

13. MULTIPLATE CLUTCH
Multi-plate clutch consists of more than one clutch plates
contrary to single plate clutch which consists of only one plate.
Friction surfaces are made in case of multi-plate clutch. Due to
increased number of friction surfaces, a multi-plate clutch can
transmit large torque.

16. CONE CLUTCH
• A cone clutch serves thesamepurpose asadisk or plate
clutch.However,insteadofmatingtwo spinning disks,thecone
clutchuses two conicalsurfacesto transmitfrictionand
torque.The cone clutchtransfers a higher torque thanplateor
disk clutchesofthesame sizedueto thewedgingactionand
increasedsurface area.

17. CONE CLUTCH

18. CONE CLUTCH
• Cone clutchesaregenerallynow onlyused inlow peripheral speed
applicationsalthoughtheywere once common in automobilesandother
combustion enginetransmissions.They areusuallynow confinedto very
specialisttransmissions in racing,rallying,or inextremeoff-road vehicles,
althoughtheyare common inpower boats.

19. CONE CLUTCH

20. Notation of cone clutch

21. CONE CLUTCH
• According to uniformpressure theory,
(where pis constant)
• According to uniformwear theory,
(where p*r is constant)

22. CENTRIFUGAL CLUTCH
• A centrifugalclutchworks on theprinciple of centrifugalforce.
• The clutch's purpose is to disengagewhentheengineis idlingso thatthe
chaindoes not move .
• These clutchesareparticularlyusefulininternalcombustion engines,
which cannot bestartedunder load.

23. Centrifugal clutch
CENTRIFUGAL CLUTCH

24. CentrifugalClutch

25. •The clutch consists of three parts:
•An outer drum that turns freely - This drum includes a
sprocket that engages the chain. When the drum turns, the
chain turns.
•A centre shaft attached directly to the engine's
crankshaft - If the engine is turning, so is the shaft.
•A pair of cylindrical clutch weights attached to the
centre shaft, along with a spring that keeps them
retracted against the shaft
CENTRIFUGAL CLUTCH

26. •
•
•
•
• It is automatic. (In a car with a manual transmission,
you need a clutch pedal. A centrifugal clutch doesn't.)
It slips automatically to avoid stalling the engine. (In
a car, the driver must slip the clutch.)
Once the engine is spinning fast enough, there is no slip
in the clutch.
It lasts forever.
CENTRIFUGAL CLUTCH
There are several advantages to a centrifugal clutch

27. CENTRIFUGAL CLUTCH

28. CENTRIFUGAL CLUTCH
• The centrifugalforceactingon each shoe,
• Justbeforeengagementwithshoe,