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[Theory of Machines] Why is Belt in a Belt drive a Link

  1. Jun 11, 2009 #1
    Hello every1...

    I'm a mechanical enggineering student...
    I've been studying theory of Machines...
    My academic syllabus includes only "Simple Mechanisms"...
    Now in Simple Mechanisms...the first thing we get to know is a "Kinematic Link"...

    Definition of a Kinematic Link:-it is a rigid or resistant body having relative motion with respect to other link/elements of the machine/mechanism

    But I just dont get how a belt in a belt drive[and chain in a chain drive ] is link...
    because if I stand on a single part of a chain I'll find the other parts moving[except for the ones in a straight line moving in a particular direction]...and these individual parts of the chain together form a chain[same should apply for belt drive...with a very large number of individual parts..I think]
    Moreover I also dont get how Belt-pulley forms a higher pair...

    Lastly is it a part of "Complex Mechanisms"...
    Plz help me ...
    any ideas on this are welcome...
    Thanxxxx
     
    Last edited: Jun 12, 2009
  2. jcsd
  3. Jun 12, 2009 #2
    Any Idea...anyone...??
    Any ideas are welcome...Please do post if you have any idea...

    Have I posted it in the Wrong section..and so not getting any help??
    Which section should I post it in??
    [Actuall I found "Conceptual evaluations" as tag for the sub section title ... and so posted it here]
     
  4. Jul 14, 2009 #3
    Sorry..for bumping...
    But anyone...having any idea ..please reply...
     
  5. Jul 14, 2009 #4
    Belt/chain drive is not regarded as a single link, they make what is known as a higher pair, & it is considered as an equivalent to two lower pairs(or kinematic link).

    Belt pulley is a higher pair because it has line contact & no slippage(ideally)
     
  6. Jul 14, 2009 #5
    Thanxx...
    That did solve my confusion...
    and
    ya..they do make a higher pair...
    But can u tell me where can I find[or can u give/write] me a document which explains how the "Chain-Sproket" Kinematic pair results in a constrained motion with a single Degree of Freedom...

    any help appreciated...
     
  7. Jul 17, 2009 #6
    what are the possible relative motions between a chain & a sprocket?

    Hint: chain cannot slip on the sprocket
     
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