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Which of the following are the inversions of double Slider Crank Chain mechanism ?    a. Scotch yoke and Oscillating cylinder engine     b. Oldham's coupling and Hand pump     c. Elliptical trammel and Oldham's coupling     d. Whitworth quick-return mechanism and Scotch yoke  Which of the above is/are correct?

Which of the following are the inversions of double Slider Crank Chain mechanism ?    a. Scotch yoke and Oscillating cylinder engine     b. Oldham's coupling and Hand pump     c. Elliptical trammel and Oldham's coupling     d. Whitworth quick-return mechanism and Scotch yoke  Which of the above is/are correct? Correct Answer Only c

Concept:

Mechanism and Inversion

  • When one of the links of a kinematic chain is fixed, the chain is known as mechanism
  • It may be used for transmitting or transforming motion e.g. engine indicators, typewriters, etc.
  • A mechanism with four links is known as a simple mechanism, and the mechanism with more than four links is known as compound mechanism
  • We can obtain as many mechanisms as the number of links in the kinematic chain by fixing, in turn, different links in a kinematic chain.
  • This method of obtaining different mechanisms by fixing different links in a kinematic chain is known as inversion of the mechanism.
  • Inversions of 4 bar mechanism
    • Beam engine mechanism
    • Coupling rod of locomotive
  • ​Inversions of Single slider-crank mechanism
    • Cylinder-piston arrangement
    • Whitworth quick return motion mechanism
    • GNOME engine
    • Crank and slotted lever quick return motion mechanism
    • Oscillatory cylinder engine mechanism
    • Pendulum pump  
  • ​Inversions of Double slider-crank mechanism
    • Elliptical trammel
    • Scotch yoke mechanism
    • Oldham's coupling

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