INVERSION MECHANISM
- 2. INVERSIONS OF FOUR BAR CHAIN MECHANISM
- 3. Inversion means getting different mechanism by fixing different links of four bar chain mechanism 1 inversion – this inversion is obtained by fixing 1st link 2nd link acts as a crank 3rd link is acts as a coupler 4th link acts as a rocker 1 INVERSION
- 4. 2nd inversion • By fixing 2 link the second inversion is obtained in which • 1 & 3 link acts as a crank • Link 4 acts as a coupler • The mechanism so obtained is known as crank-crank or double crank
- 5. 3rd inversion • By fixing link 3 the 3rd inversion is obtained in which • Link 1 acts as a coupler • Link 2 acts as a crank • Link 4 acts as a rocker
- 6. 4th inversion • By fixing 4 link the 4th inversion is obtained in which • Link 1 & 3 acts as a rocker • Link 2 acts as coupler
- 7. SLIDER CRANK CHAIN • WHEN ONE OF THE TURNING PAIRS OF A FOUR BAR CHAIN IS REPLACED BY A SLIDING PAIR, IT BECOMES A SLIDER CRANK MECHANISM
- 8. INVERSION OF SLIDER CRANK MECHANISM • FIRST INVERSION • THIS INVERSION IS OBTAINED WHENLINK 1 IS FIXED WHERE • LINK 2 ACTS AS A CRANK • LINK 4 ACTS AS A SLIDER
- 9. SECOND INVERSION • THIS INVERSION IS OBTAINED WHEN LINK 2nd IS FIXED • LINK 3 ALONG WITH THE SLIDER ACTS AS A CRANK
- 10. APPLICATIONS ARE-1.WHITWORTH QUICK –RETURN MECHANISM 2.ROTARY ENGINE • IT IS A MECHANISM USED IN WORKSHOPS TO CUT METALS • FORWARD STROKES TAKES A LITTLE LONGER AND CUTS TWHITWORTH QUICK –RETURN MECHANISMH METAL WHEREAS THE RETURN STROKE IS IDLE AND TAKES A SHORTER TIME
- 12. ROTARY ENGINE • LINK 2 IS FIXED • LINK 3 IS ROTATED DUE TO PISTON MOVEMENT • DUE TO THE ROTATION OF LINK 3 ,LINK 1 ROTATES ABOUT O
- 13. ROTARY ENGINE
- 15. THIRD INVERSION • THIS INVERSION IS OBTAINED WHEN LINK 3 IS FIXED • LINK 2 ACTS AS A CRANK • LINK 4 ACTS AS A ROCKER OR OSCILLATOR • LINK 1 ACTS AS A COUPLER
- 16. OSCILLATING CYLINDER ENGINE • LINK 4 IS MADE IN THE FORM OF CYLINDER • PISTON IS FIXED TO THE END OF LINK1 • THE PISTON RECIPROCATES INSIDE THE CYLINDER PIVOTED TO THE LINK 3 • WHEN THE PISTON RECIPROCATES IN THE CYLINDER ,THE CRANK ROTATES
- 19. CRANK AND SLOTTED LEVER MECHANISM • IF THE CYLINDER OF AN OSCILLATING CYLINDER ENGINE IS MADE IN THE FORM OF A GUIDE AND THE PISTON IN THE SLIDER • LINK 3 IS FIXED • LINK 2 ACTS AS CRANK • LINK 5 IS A LEVER
- 21. FOURTH INVERSION • IN THIS LINK 4 IS FIXED • LINK 3 ACTS AS A OSCILLATES ON LINK 4 • WHICH MAKES THE LINK 2 TO OSCILLATES ALONG THE AXIS OF THE FIXED LINK 4 • APPLICATION: HAND PUMP
- 22. HAND PUMP LINK 4 IS MADE IN THE FORM OF A CYLINDER PLUNGER FIXED TO THE LINK 1 RECIPROCATES IN IT. IF LINK 4 OF THE SLIDER CRANK MECHANISM IS FIXED ,THE FOURTH INVERSION IS OBTAINED LINK 3 CAN OSCILLATE ABOUT THE FIXED PIVOT B ON LINK 4.THIS MAKES END A OF THELINK 2 TO OSCILLATE ABOUT B AND END O TO RECIPROCATE ALONG THE AXIS OF THE FIXED LINK 4
- 25. DOUBLE SLIDER CRANK MECHANISM • A FOUR –BAR CHAIN HAVING TWO SLIDING AND TWO TURNING PAIRS SUCH THAT TWO PAIRS OF THE SAME KIND ARE ADJACENT IS KNOWN AS A DOUBLE –SLIDER CRANK MECHANISM
- 26. FIRST INVERSION • THIS INVERSION IS OBTAINED WHEN LINK 1 IS FIXED • ADJACENT PAIRS 23,34 ARE TURNING PAIRS • THE OTHER TWO PAIRS 12,14 ARE SLIDING PAIRS • APPLICATION: ELLIPTICAL TRAMMEL
- 28. SECOND INVERSION • IF ANY OF THE SLIDE BLOCKS OF THE FIRST INVERSION IS FIXED, THE SECOND INVERSION IS OBTAINED • LINK 4 IS FIXED, END B OF CRANK 3 ROTATES ABOUT A • LINK 1 RECIPROCATES IN THE HORIZONTAL • APPLICATION :SCOTCH YOKE • A SCOTCH YOKE IS A DEVICE WHICH IS USED TO CONVERT ROTARY MOTION INTO SLIDING MOTION
- 29. SCOTCH YOKE
- 30. THIRD INVERSION • THIS INVERSION IS OBTAINED WHEN LINK 3 OF THE FIRST INVERSION IS FIXED • LINK 1 IS FREE TO MOVE • THIS INVERSION IS USED TO CONNECT LINK 2 AND 4 • IF THE ROTATING LINKS 2 &4 OF THE MECHANISM ARE REPLACED BY TWO SHAFTS • ONE ACTS AS A DRIVER AND ANOTHER AS A DRIVEN SHAFTS WITH THEIR AXES • THEY ARE USED TO CONNECT TWO SHAFTS WHEN THE DISTANCE B/W THEM IS SMALL • APPLICATION : OLDHAM’S COUPLING