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000-209 Intro to CS. 5/Mother 1
Element of
Mechanical
Engineering
2
Internal combustion engine
I.C Engines
3
Introduction
• An internal combustion engine is a heat
engine which converts the heat energy
released by combustion of fue...
Classification
• According to type of fuel used.
– Petrol engine.
– Diesel engine.
– Gas engine.
– Bi-fuel engine.
• Accor...
Classification
• According to method of ignition.
– Spark ignition.
– Compression ignition.
• According to the cycle of co...
Classification
• According to the arrangement of cylinders
– Vertical engine.
– Horizontal.
– Inline engine.
– Radial engi...
Position of the cylinder
8
Parts of I.C Engine
• Cylinder
• Piston
• Piston rings
• Connecting rod
• Crank and
crankshaft
• Valves
• Flywheel
• Crank...
1.Cylinder
• It is the heart of the
engine in which the fuel
is burnt and the power
is developed.
• The inside diameter ar...
Cylinder
11
2.Piston
– Close fitting hollow
– cylinder moving
to and fro in the
cylinder.
– Function – power
developed by the
combusti...
Piston
13
3. Piston rings
– Metallic rings
inserted into groves
provided at top end
of the piston.
– Function – it
maintains a gas-
...
Piston Rings
15
4. Connecting rod
– Link that connects
the piston and
crankshaft by
means of pin joint.
– Function – it
converts the
recti...
Connecting road
17
5.Crank and crankshaft
– Crank is a lever
that is connects
crankshaft and
connecting rod.
– Crankshaft is a
shaft which
tr...
Crank and crankshaft
19
6.Valves
– These are devices
which control the
flow of intake and
exhaust gases.
20
Valves
21
7.Fly wheel
– Mounted on
crankshaft to
maintain uniform
rotation of
crankshaft.
– Restores the
energy to the
piston.
22
Fly-wheel
23
Four stroke petrol engine
• Four stroke petrol
engine consists of
–Cylinder
–Cover
–Mechanically
operated valves
–Spark pl...
Construction and working of
Four stroke PETROL engine
1.Suction stroke
2.Compression stroke
3.Power stroke
4.Exhaust strok...
1.Suction stroke
• Inlet is open exhaust is
closed.
• Piston moves from TDC
to BDC.
• Crankshaft revolves half
the rotatio...
2.Compression stroke
• Both inlet and exhaust
are closed.
• Piston moves from BDC to
TDC.
• Crankshaft revolves half
the r...
3.Power stroke
• Piston moves from TDC
to BDC.
• Crankshaft revolves half
the rotation.
• burnt gases generate
energy and ...
4.Exhaust stroke
• exhaust is open and
inlet is closed.
• Piston moves from BDC
to TDC.
• crankshaft revolves half
the rot...
Four stroke petrol engine
30
Construction and working of
Four stroke DIESEL engine
1.Suction stroke
2.Compression stroke
3.Power or expansion stroke
4....
1.Suction stroke
32
• Inlet is open exhaust is
closed.
• Piston moves from TDC to
BDC and crankshaft revolves
half the rev...
2.Compression stroke
• Inlet and exhaust are
closed.
• Piston moves from BDC to
TDC.
• Cranking required in first
cycle.
•...
3.Power stroke
• Piston moves from TDC to
BDC.
• Inlet and exhaust valves are
closed.
• burnt gases generate
energy and fo...
3.Exhaust stroke
• exhaust is open and inlet
is closed.
• Piston moves from BDC to
TDC.
• crankshaft revolves half
the rot...
Four stroke diesel engine
36
Prepared by:- Manthan R. Kanani
Enrollment Number:-140050119028
Roll no:- 14 ME 028
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Internal combustion engine

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Internal combustion engine

  1. 1. 000-209 Intro to CS. 5/Mother 1
  2. 2. Element of Mechanical Engineering 2
  3. 3. Internal combustion engine I.C Engines 3
  4. 4. Introduction • An internal combustion engine is a heat engine which converts the heat energy released by combustion of fuel taking place inside the engine into mechanical work. Heat energy Mechanical work 4
  5. 5. Classification • According to type of fuel used. – Petrol engine. – Diesel engine. – Gas engine. – Bi-fuel engine. • According to number of strokes per cycle. – 4 – stroke engines. – 2 – stroke engines. 5
  6. 6. Classification • According to method of ignition. – Spark ignition. – Compression ignition. • According to the cycle of combustion. – Otto cycle. – Diesel cycle. – Duel combustion. • According to the number of cylinders. – Single cylinder. – Multi cylinder. 6
  7. 7. Classification • According to the arrangement of cylinders – Vertical engine. – Horizontal. – Inline engine. – Radial engine. – V- engine. • According to method of cooling – Air cooled engine. – Water cooled engine. 7
  8. 8. Position of the cylinder 8
  9. 9. Parts of I.C Engine • Cylinder • Piston • Piston rings • Connecting rod • Crank and crankshaft • Valves • Flywheel • Crankcase 9
  10. 10. 1.Cylinder • It is the heart of the engine in which the fuel is burnt and the power is developed. • The inside diameter are called “bore”. • The piston reciprocates inside the cylinder 10
  11. 11. Cylinder 11
  12. 12. 2.Piston – Close fitting hollow – cylinder moving to and fro in the cylinder. – Function – power developed by the combustion of fuel is transmitted by piston to the crank- shaft through the connecting rod. 12
  13. 13. Piston 13
  14. 14. 3. Piston rings – Metallic rings inserted into groves provided at top end of the piston. – Function – it maintains a gas- tight joint between the piston and the cylinder. 14
  15. 15. Piston Rings 15
  16. 16. 4. Connecting rod – Link that connects the piston and crankshaft by means of pin joint. – Function – it converts the rectilinear motion of the piston into rotary motion of crankshaft. 16
  17. 17. Connecting road 17
  18. 18. 5.Crank and crankshaft – Crank is a lever that is connects crankshaft and connecting rod. – Crankshaft is a shaft which transmits power from engine to wheels. 18
  19. 19. Crank and crankshaft 19
  20. 20. 6.Valves – These are devices which control the flow of intake and exhaust gases. 20
  21. 21. Valves 21
  22. 22. 7.Fly wheel – Mounted on crankshaft to maintain uniform rotation of crankshaft. – Restores the energy to the piston. 22
  23. 23. Fly-wheel 23
  24. 24. Four stroke petrol engine • Four stroke petrol engine consists of –Cylinder –Cover –Mechanically operated valves –Spark plug –Connecting rod and crank 24
  25. 25. Construction and working of Four stroke PETROL engine 1.Suction stroke 2.Compression stroke 3.Power stroke 4.Exhaust stroke 25
  26. 26. 1.Suction stroke • Inlet is open exhaust is closed. • Piston moves from TDC to BDC. • Crankshaft revolves half the rotation. • Cranking • Petrol air mixture drawn into cylinder due to pressure difference. 26
  27. 27. 2.Compression stroke • Both inlet and exhaust are closed. • Piston moves from BDC to TDC. • Crankshaft revolves half the rotation. • Cranking • Petrol air mixture is compressed to a ratio of 1:11. • This mixture is ignited by spark plug. 27
  28. 28. 3.Power stroke • Piston moves from TDC to BDC. • Crankshaft revolves half the rotation. • burnt gases generate energy and force the piston to move down. 28
  29. 29. 4.Exhaust stroke • exhaust is open and inlet is closed. • Piston moves from BDC to TDC. • crankshaft revolves half the rotation. • energy for this stroke is supplied by flywheel. • Burnt gases are expelled out through outlet port. 29
  30. 30. Four stroke petrol engine 30
  31. 31. Construction and working of Four stroke DIESEL engine 1.Suction stroke 2.Compression stroke 3.Power or expansion stroke 4.Exhaust stroke 31
  32. 32. 1.Suction stroke 32 • Inlet is open exhaust is closed. • Piston moves from TDC to BDC and crankshaft revolves half the revolution. • Cranking during first cycle. • Due to the pressure difference air enters the cylinder through air filter.
  33. 33. 2.Compression stroke • Inlet and exhaust are closed. • Piston moves from BDC to TDC. • Cranking required in first cycle. • Air will be compressed to a ratio of 1:20. • Diesel oil is sprayed into cylinder by injector and auto-ignition takes place. 33
  34. 34. 3.Power stroke • Piston moves from TDC to BDC. • Inlet and exhaust valves are closed. • burnt gases generate energy and force the piston to move down till injection of fuel is complete. 34
  35. 35. 3.Exhaust stroke • exhaust is open and inlet is closed. • Piston moves from BDC to TDC. • crankshaft revolves half the rotation. • energy for this stroke is supplied by flywheel. • Burnt gases are expelled out through outlet port. 35
  36. 36. Four stroke diesel engine 36
  37. 37. Prepared by:- Manthan R. Kanani Enrollment Number:-140050119028 Roll no:- 14 ME 028

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