This document discusses the design of internal combustion engine components. It describes the key components that need to be designed, including the cylinder and liner, piston, piston rings, connecting rod, and crankshaft. For each component, the document outlines design considerations and stresses that must be addressed. It provides information on material selection and stresses on thin-walled cylinders. The piston, piston rings, connecting rod, and their interactions are examined in detail.

1. UNIT:04
Design
of
I.C.Engine
Components
April 2, 2018
D.P.Bhaskar
1
SPPU Pune’ SRES’ Sanjivani College of Engineering Kopargaon

2. Parts to be Designed
• Cylinder & Cylinder Liner
• Piston, Piston Rings & Gudgeon Pin
• Connecting Rod
• Crankshaft & Crank Pin
April 2, 2018 D.P.Bhaskar 2
SPPU Pune’ SRES’ Sanjivani College of Engineering Kopargaon

3. Cylinder & Cylinder Liner
April 2, 2018 D.P.Bhaskar 3
SPPU Pune’ SRES’ Sanjivani College of Engineering Kopargaon

4. Small Engine:
Cylinder and Frame is made
up of one piece casting
Large Engines:
• Separate Cylinder liner is used
• Cylinder liner, Water Jacket
and frame are manufactured separately
April 2, 2018 D.P.Bhaskar 4
SPPU Pune’ SRES’ Sanjivani College of Engineering Kopargaon

5. CYLINDER LINER
• Cylindrical part fitted into an Engine Block to form a
Cylinder.
• Serves as the inner wall of a cylinder, forms a sliding
surface for the piston rings while retaining the lubricant
within.
• Allows longitudinal expansions
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SPPU Pune’ SRES’ Sanjivani College of Engineering Kopargaon

6. Types of Liners
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SPPU Pune’ SRES’ Sanjivani College of Engineering Kopargaon

7. Terminology
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SPPU Pune’ SRES’ Sanjivani College of Engineering Kopargaon

8. April 2, 2018 D.P.Bhaskar 8

9. Thickness of cylinder wall (Thin cylinder)
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10. April 2, 2018 D.P.Bhaskar 10
SPPU Pune’ SRES’ Sanjivani College of Engineering Kopargaon

11. STRESSES in THIN CYLINDER
April 2, 2018 D.P.Bhaskar 11

12. STUDS
April 2, 2018 D.P.Bhaskar 12
SPPU Pune’ SRES’ Sanjivani College of Engineering Kopargaon

13. April 2, 2018 D.P.Bhaskar 13

14. April 2, 2018 D.P.Bhaskar 14
SPPU Pune’ SRES’ Sanjivani College of Engineering Kopargaon

15. April 2, 2018 D.P.Bhaskar 15

16. April 2, 2018 D.P.Bhaskar 16

17. April 2, 2018 D.P.Bhaskar 17

18. PISTON
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SPPU Pune’ SRES’ Sanjivani College of Engineering Kopargaon

19. April 2, 2018 D.P.Bhaskar 19
SPPU Pune’ SRES’ Sanjivani College of Engineering Kopargaon

20. PISTON
• Reciprocating part of I.C. engine.
• Transmit gas pressure-force to CS through CR
• Compresses the gas in compression stroke.
• Seals inside portion of cylinder from crankcase: Piston rings
• Takes side thrust resulting from obliquity of connecting rod.
• Dissipates heat from combustion chamber to cylinder wall
April 2, 2018 D.P.Bhaskar 20

21. Design requirements of Piston
• Should have sufficient strength
• Should have sufficient rigidity
• Adequate capacity to dissipate heat
• Should have minimum weight
• Form an efficient seal to prevent leakage
• Noiseless operation
April 2, 2018 D.P.Bhaskar 21
SPPU Pune’ SRES’ Sanjivani College of Engineering Kopargaon

22. Piston head:
Depend upon required volume for CC and arrangement of valves.
April 2, 2018 D.P.Bhaskar 22

23. Heat dissipation
Piston head absorbs heat during combustion and transmits to cylinder wall
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24. Piston RIBS and CUP
April 2, 2018 D.P.Bhaskar 24

25. PISTON RINGS
April 2, 2018 D.P.Bhaskar 25

26. Dimensions of cross section of rings
April 2, 2018 D.P.Bhaskar 26

27. April 2, 2018 D.P.Bhaskar 27
SPPU Pune’ SRES’ Sanjivani College of Engineering Kopargaon

28. April 2, 2018 D.P.Bhaskar 28
SPPU Pune’ SRES’ Sanjivani College of Engineering Kopargaon

29. April 2, 2018 D.P.Bhaskar 29
SPPU Pune’ SRES’ Sanjivani College of Engineering Kopargaon

30. Piston pin (Gudgeon pin)
April 2, 2018 D.P.Bhaskar 30
•Connects Piston & CR
•End movement is restricted by circles'.
Two criteria's
•Bearing
•Bending

31. April 2, 2018 D.P.Bhaskar 31

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33. April 2, 2018 D.P.Bhaskar 33

34. April 2, 2018 D.P.Bhaskar 34
SPPU Pune’ SRES’ Sanjivani College of Engineering Kopargaon

35. April 2, 2018 D.P.Bhaskar 35
SPPU Pune’ SRES’ Sanjivani College of Engineering Kopargaon

36. April 2, 2018 D.P.Bhaskar 36

37. April 2, 2018 D.P.Bhaskar 37
Connecting ROD
SPPU Pune’ SRES’ Sanjivani College of Engineering Kopargaon

38. Connecting ROD
April 2, 2018 D.P.Bhaskar 38
SPPU Pune’ SRES’ Sanjivani College of Engineering Kopargaon

39. April 2, 2018 D.P.Bhaskar 39

40. Loads on CR
April 2, 2018 D.P.Bhaskar 40
CR is four times stronger for buckling about YY
axis as compared to bucking about XX axis.
Rankine critical load required to buckle the CR: Pcr
•Pc=Pcr/FoS
•Pcr=Pc * FoS
SPPU Pune’ SRES’ Sanjivani College of Engineering Kopargaon

41. Loads on CR
April 2, 2018 D.P.Bhaskar

42. April 2, 2018 D.P.Bhaskar 42

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SPPU Pune’ SRES’ Sanjivani College of Engineering Kopargaon

44. April 2, 2018 D.P.Bhaskar 44

45. Small end bearings
April 2, 2018 D.P.Bhaskar 45

46. Big end bearings
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47. April 2, 2018 D.P.Bhaskar 47

48. April 2, 2018 D.P.Bhaskar 48
SPPU Pune’ SRES’ Sanjivani College of Engineering Kopargaon