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LESSON TWO

LESSON TWO. Crankshaft, Main Bearings and Shaf Alignment. CRANKSHAFT,MAIN BEARINGS & SHAFT ALIGNMENT. CRANKSHAFT,MAIN BEARINGS & SHAFT ALIGNMENT 1.1 DEFINITION OF A CRANKSHAFT. CRANKSHAFT,MAIN BEARINGS & SHAFT ALIGNMENT 1.1 DEFINITION OF A CRANKSHAFT

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LESSON TWO

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  1. LESSON TWO Crankshaft, Main Bearings and Shaf Alignment

  2. CRANKSHAFT,MAIN BEARINGS & SHAFT ALIGNMENT

  3. CRANKSHAFT,MAIN BEARINGS & SHAFT ALIGNMENT • 1.1DEFINITION OF A CRANKSHAFT

  4. CRANKSHAFT,MAIN BEARINGS & SHAFT ALIGNMENT • 1.1DEFINITION OF A CRANKSHAFT • The crankshaft converts reciprocating motion in the cylinder into rotarymotion of the propeller shaft.

  5. CRANKSHAFT,MAIN BEARINGS & SHAFT ALIGNMENT • 1.1DEFINITION OF A CRANKSHAFT • The crankshaft converts reciprocating motion in the cylinder into rotarymotion of the propeller shaft. • 1.2PARTS

  6. CRANKSHAFT,MAIN BEARINGS & SHAFT ALIGNMENT • 1.1DEFINITION OF A CRANKSHAFT • The crankshaft converts reciprocating motion in the cylinder into rotarymotion of the propeller shaft. • 1.2PARTS • The crankshaft is made up of throws and jurnals. A throw consists a pin ( secured or attached to big / bottom end bearings ) and two webs or crancks.Jurnals rest or lie in the main bearings.

  7. CRANKSHAFT,MAIN BEARINGS & SHAFT ALIGNMENT • 1.1DEFINITION OF A CRANKSHAFT • The crankshaft converts reciprocating motion in the cylinder into rotarymotion of the propeller shaft. • 1.2PARTS • The crankshaft is made up of throws and jurnals. A throw consists a pin ( secured or attached to big / bottom end bearings ) and two webs or crancks.Jurnals rest or lie in the main bearings. • 1.3 STRESSES ( fluctuating )

  8. CRANKSHAFT,MAIN BEARINGS & SHAFT ALIGNMENT • 1.1DEFINITION OF A CRANKSHAFT • The crankshaft converts reciprocating motion in the cylinder into rotarymotion of the propeller shaft. • 1.2PARTS • The crankshaft is made up of throws and jurnals. A throw consists a pin ( secured or attached to big / bottom end bearings ) and two webs or crancks.Jurnals rest or lie in the main bearings. • 1.3 STRESSES ( fluctuating ) • Bending ( when the piston is at TDC );

  9. CRANKSHAFT,MAIN BEARINGS & SHAFT ALIGNMENT • 1.1DEFINITION OF A CRANKSHAFT • The crankshaft converts reciprocating motion in the cylinder into rotarymotion of the propeller shaft. • 1.2PARTS • The crankshaft is made up of throws and jurnals. A throw consists a pin ( secured or attached to big / bottom end bearings ) and two webs or crancks.Jurnals rest or lie in the main bearings. • 1.3 STRESSES ( fluctuating ) • Bending ( when the piston is at TDC ); • Sheer stress ( in operation );

  10. CRANKSHAFT,MAIN BEARINGS & SHAFT ALIGNMENT • 1.1DEFINITION OF A CRANKSHAFT • The crankshaft converts reciprocating motion in the cylinder into rotarymotion of the propeller shaft. • 1.2PARTS • The crankshaft is made up of throws and jurnals. A throw consists a pin ( secured or attached to big / bottom end bearings ) and two webs or crancks.Jurnals rest or lie in the main bearings. • 1.3 STRESSES ( fluctuating ) • Bending ( when the piston is at TDC ); • Sheer stress ( in operation ); • Torsion ( due to speed change, i.e. acceleration & deceleration )

  11. 1.4 MANUFACTURING

  12. 1.4 MANUFACTURING • Solid forged built in a single piece ( small-slow speed engines )

  13. 1.4 MANUFACTURING • Solid forged built in a single piece ( small-slow speed engines ) • Semi-built design ( large medium-speed engines ). Crankpins & webs are forged or cast in one piece and shrunk on to the journals.

  14. 1.4 MANUFACTURING • Solid forged built in a single piece ( small-slow speed engines ) • Semi-built design ( large medium-speed engines ). Crankpins & webs are forged or cast in one piece and shrunk on to the journals. • Fully-built ( cast in single piece – websare shrunk on to the crankpins and journals

  15. 1.4 MANUFACTURING • Solid forged built in a single piece ( small-slow speed engines ) • Semi-built design ( large medium-speed engines ). Crankpins & webs are forged or cast in one piece and shrunk on to the journals. • Fully-built ( cast in single piece – websare shrunk on to the crankpins and journals 1.5 MATERIALS

  16. 1.4 MANUFACTURING • Solid forged built in a single piece ( small-slow speed engines ) • Semi-built design ( large medium-speed engines ). Crankpins & webs are forged or cast in one piece and shrunk on to the journals. • Fully-built ( cast in single piece – websare shrunk on to the crankpins and journals 1.5 MATERIALS • Carbon steel

  17. 1.4 MANUFACTURING • Solid forged built in a single piece ( small-slow speed engines ) • Semi-built design ( large medium-speed engines ). Crankpins & webs are forged or cast in one piece and shrunk on to the journals. • Fully-built ( cast in single piece – websare shrunk on to the crankpins and journals 1.5 MATERIALS • Carbon steel • Alloy of nickel, chromium & molibdenum

  18. 1.4 MANUFACTURING • Solid forged built in a single piece ( small-slow speed engines ) • Semi-built design ( large medium-speed engines ). Crankpins & webs are forged or cast in one piece and shrunk on to the journals. • Fully-built ( cast in single piece – websare shrunk on to the crankpins and journals 1.5 MATERIALS • Carbon steel • Alloy of nickel, chromium & molibdenum • Specialy alloyed grey cast steel

  19. 1.4 MANUFACTURING • Solid forged built in a single piece ( small-slow speed engines ) • Semi-built design ( large medium-speed engines ). Crankpins & webs are forged or cast in one piece and shrunk on to the journals. • Fully-built ( cast in single piece – websare shrunk on to the crankpins and journals 1.5 MATERIALS • Carbon steel • Alloy of nickel, chromium & molibdenum • Specialy alloyed grey cast steel 1.6 ARRANGEMENT OF CRANKS

  20. 1.4 MANUFACTURING • Solid forged built in a single piece ( small-slow speed engines ) • Semi-built design ( large medium-speed engines ). Crankpins & webs are forged or cast in one piece and shrunk on to the journals. • Fully-built ( cast in single piece – websare shrunk on to the crankpins and journals 1.5 MATERIALS • Carbon steel • Alloy of nickel, chromium & molibdenum • Specialy alloyed grey cast steel 1.6 ARRANGEMENT OF CRANKS Multi-throw shaft to provide for the engine firing order

  21. 2. MAIN BEARINGS / CRANKSHAFT BEARINGS

  22. 2. MAIN BEARINGS / CRANKSHAFT BEARINGS 2.1 LOCATION

  23. 2. MAIN BEARINGS / CRANKSHAFT BEARINGS 2.1 LOCATION In the transverse saddles of the bedplate.

  24. 2. MAIN BEARINGS / CRANKSHAFT BEARINGS 2.1 LOCATION In the transverse saddles of the bedplate. 2.2 PURPOSE

  25. 2. MAIN BEARINGS / CRANKSHAFT BEARINGS 2.1 LOCATION In the transverse saddles of the bedplate. 2.2 PURPOSE To provide support for the crankshaft

  26. 2. MAIN BEARINGS / CRANKSHAFT BEARINGS 2.1 LOCATION In the transverse saddles of the bedplate. 2.2 PURPOSE To provide support for the crankshaft 2.3 MATERIAL ( multilayer bearings )

  27. 2. MAIN BEARINGS / CRANKSHAFT BEARINGS 2.1 LOCATION In the transverse saddles of the bedplate. 2.2 PURPOSE To provide support for the crankshaft 2.3 MATERIAL ( multilayer bearings ) Used for crankshaft bearings and connecting rod big end bearings ( 4 stroke engines )

  28. 2. MAIN BEARINGS / CRANKSHAFT BEARINGS • 2.1 LOCATION • In the transverse saddles of the bedplate. • 2.2 PURPOSE • To provide support for the crankshaft • 2.3 MATERIAL ( multilayer bearings ) • Used for crankshaft bearings and connecting rod big end bearings ( 4 stroke engines ) • Steel support shell ( basic element );

  29. 2. MAIN BEARINGS / CRANKSHAFT BEARINGS • 2.1 LOCATION • In the transverse saddles of the bedplate. • 2.2 PURPOSE • To provide support for the crankshaft • 2.3 MATERIAL ( multilayer bearings ) • Used for crankshaft bearings and connecting rod big end bearings ( 4 stroke engines ) • Steel support shell ( basic element ); • Bearing metal ( white metal, copper-lead or aluminium-tin alloy, leaded bronze );

  30. 2. MAIN BEARINGS / CRANKSHAFT BEARINGS • 2.1 LOCATION • In the transverse saddles of the bedplate. • 2.2 PURPOSE • To provide support for the crankshaft • 2.3 MATERIAL ( multilayer bearings ) • Used for crankshaft bearings and connecting rod big end bearings ( 4 stroke engines ) • Steel support shell ( basic element ); • Bearing metal ( white metal, copper-lead or aluminium-tin alloy, leaded bronze ); • Nickel barrier ( separating the two layers );

  31. 2. MAIN BEARINGS / CRANKSHAFT BEARINGS • 2.1 LOCATION • In the transverse saddles of the bedplate. • 2.2 PURPOSE • To provide support for the crankshaft • 2.3 MATERIAL ( multilayer bearings ) • Used for crankshaft bearings and connecting rod big end bearings ( 4 stroke engines ) • Steel support shell ( basic element ); • Bearing metal ( white metal, copper-lead or aluminium-tin alloy, leaded bronze ); • Nickel barrier ( separating the two layers ); • Galvanized layer ( good running-in and dry running properties )

  32. 2. MAIN BEARINGS / CRANKSHAFT BEARINGS • 2.1 LOCATION • In the transverse saddles of the bedplate. • 2.2 PURPOSE • To provide support for the crankshaft • 2.3 MATERIAL ( multilayer bearings ) • Used for crankshaft bearings and connecting rod big end bearings ( 4 stroke engines ) • Steel support shell ( basic element ); • Bearing metal ( white metal, copper-lead or aluminium-tin alloy, leaded bronze ); • Nickel barrier ( separating the two layers ); • Galvanized layer ( good running-in and dry running properties ) • Anti-corrosion layer ( lead or indium )

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