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Chapter 5

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sameerg edited this page May 26, 2011 · 1 revision

chapter5

fixed link chain mechanism

  • links

  • rigid ,fluid ,flexible j=h/2+[3/2]l -2

  • j = Number of binary joints,

  • h = Number of higher pairs, and

  • l = Number of links.

  • 4->simple

  • 4->compound Degrees of Freedom number of input parameters (usually pair variables) which must be independently controlled in order to bring the mechanism into a useful n = 3 (l – 1) – 2 j – h method of obtaining different mechanisms by fixing different links in a kinematic chain, is known as inversion of the mechanism Types of Kinematic Chains

  1. Four bar chain or quadric cyclic chain,
  2. Single slider crank chain, and
  3. Double slider crank chain.

Grashof ’s law for a four bar mechanism, the sum of the shortest and longest link lengths should not be greater than the sum of the remaining two link lengths if there is to be continuous relative motion between the two links. The mechanism in which no link makes a complete revolution will not be useful. one of the links, in particular the shortest link, will make a complete revolution relative to the other three links, if it satisfies the Grashof ’s law. Such a link is known as crank or driver. else[oscillating]lever or rocker or follower connector :coupler

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