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# Clutch(single and multi plate)

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• very useful one for mechanical and agricultural engg. students.

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### Clutch(single and multi plate)

1. 1. MULTIPLATE CLUTCH    By:Nirav patel  10ME027 MACHINE DESIGN 1
2. 2. What is clutch?  A Clutch is a machine member used to connect the driving shaft to a driven shaft, so that the driven shaft may be started or stopped at will, without stopping the driving shaft.
3. 3. Function Of Clutch Clutch is used to transmit power from driven shaft to driving shaft. In automobiles, where vehicle can be stopped for a while or to change the gear, the requirement is that the driven shaft should stop but the engine should run naturally under the no load condition.  This is achieved by using clutch mounted between engine shaft and gearbox shaft and which is operated by a lever.
4. 4. Types Of Clutch Types of Clutches Positive Clutch Friction Clutch Plate Or Disc Clutch Single plate clutch Multiplate Clutch Cone Clutch Centrifugal Clutch
5. 5. Single Plate clutch
6. 6. 2R 1R rδ 1R 2R Design of clutch plate
7. 7. 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
8. 8. 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 δrr2πδA δrr2πpδW
9. 9. Single Plate Clutch  Frictional resistance offered by ring is,  Frictional torque acting on the ring is, ……(1) δWμFr δrrpμ2πδr)r2πμ(pFr r 2 r rr δrpμ2πδr.rrpμ2πT rFT
10. 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. 11. Single Plate Clutch (a)uniform pressure theory:  Assuming that the intensity of pressure over the entire contacting surface area is constant,  Then, p=constant ….(2)  Total torque transmitted by single plate clutch can be obtain by integrating Equation 2 2 2 1 RRπ W areasurfacecontacting load p
12. 12. Single Plate Clutch  (1)within limit R2 to R1 we [∵p=Constant] 1 2 R R 2 T 0 r δrrpμ2πΤ 1 2 R R 2 T 0 r δrrpμ2πΤ 3 2 3 1 R R 3 RRpμπ 3 2 3 r pμ2πΤ 2 1
13. 13. …….(A)  Equation (A) gives the torque transmitted by single plate clutch due to friction considering uniform pressure theory. 3 2 3 12 2 2 1 RR RRπ W μπ 3 2 Τ 2 2 2 1 RRπ W p 2 2 2 1 3 2 3 1 RR RR μ W 3 2 Τ
14. 14. 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)
15. 15. Single Plate Clutch  Axial load acting on the ring is δW=p 2π r δr δW=2 π C δr …(4)  Integrating above Equation(4) within limit we get, δrC2π r C δW w 0 R R 1 2 δrC2πδW
16. 16. Single Plate Clutch ……….(5)  We know that frictional torque acting on ring is, …….(6) 21 21 R R RR2π W C RRC2rC2πW 1 2 δrrCμ2πΤδrr r C μπ2Τ δrrpμ2πΤ r 2 r 2 r
17. 17. Single Plate Clutch  Torque transmitted by single plate clutch can be obtain by integrating the Equation (4 ) within the limit R2 to R1 we get, 2 RR Cμ2π 2 r Cμ2πΤ δrrCμ2πΤ δrrCμ2πΤ 2 2 2 1 R R 2 R R T 0 r R R T 0 r 1 2 2 2 2 2
18. 18. Single Plate Clutch  This is the torque transmitted by single plate due to friction considering uniform wear theory. μWπ 2 1 Τ RR RR μWπ 2 1 Τ RR RR2π W μπΤ 21 2 2 2 1 2 2 2 1 21 21R R
19. 19. Single Plate Clutch  Power transmitted by single plate clutch is given by, rpminshaftofSpeedNwhere, Watt 60 NΤ2π P ΤωP
20. 20. Multiplate Clutch  Multiplate clutch is used when large torque is to be transmitted e.g. motor cars and machine tools  Multiplate clutch is used when compact construction is required e.g. scooters and motor cycles.
21. 21. For multiplate clutch  For uniform pressure theory,  For uniform wear theory, 2 2 2 1 3 2 3 1 RR RR μ W 3 2 nΤ 21 RRμW 2 1 nΤ
22. 22. Multiplate Clutch Notes:  In case of new clutch ,the intensity of pressure is uniform along the surface of clutch but in case of old clutch uniform theory is more correct.  For single plate clutch normally both sides of the plate are effective .there for single plate clutch has two pairs of contacting surface i.e. n=2.  In actual practice, usually the theory of uniform wear is used in analysis of clutch.
23. 23.  Intensity of pressure is maximum at the inner radius R2 of the friction or contact surface,  Intensity of pressure is minimum at the inner radius R1 of the friction or contact surface, 2 max2max R C PORCRP 1 max1max R C PORCRP
24. 24. In mutilate disc clutch no of disc on driving shaft no of disc on driven shaft So no. of pairs in contact, 2n 1n 1nnn 21
25. 25. Multiplate clutch
26. 26. Clutch plate
27. 27. THANK YOU….
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