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

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Discussion Overview

The discussion revolves around the classification of belts and chains in mechanical systems, specifically in the context of belt drives and chain drives. Participants explore the concept of kinematic links, higher pairs, and the nature of motion in these mechanisms, with a focus on theoretical understanding rather than practical applications.

Discussion Character

  • Conceptual clarification
  • Debate/contested
  • Technical explanation

Main Points Raised

  • A participant expresses confusion about how a belt in a belt drive qualifies as a kinematic link, questioning the definition and the motion of individual parts within the belt or chain.
  • Some participants clarify that belts and chains are not regarded as single links but rather as higher pairs, which are considered equivalent to two lower pairs or kinematic links.
  • There is a discussion about the nature of the belt-pulley interaction, with some asserting that it is a higher pair due to line contact and the ideal condition of no slippage.
  • A participant requests additional resources or documents that explain how the chain-sprocket kinematic pair results in constrained motion with a single degree of freedom.
  • Questions are raised about the possible relative motions between a chain and a sprocket, emphasizing the condition that the chain cannot slip on the sprocket.

Areas of Agreement / Disagreement

Participants generally agree that belts and chains are classified as higher pairs rather than single links. However, there remains some uncertainty and differing perspectives regarding the implications of this classification and the specific nature of motion in these systems.

Contextual Notes

Limitations include the lack of detailed definitions and explanations regarding the classification of kinematic pairs and the specific mechanics of motion in belt and chain drives. The discussion does not resolve the complexities involved in these concepts.

nanunath
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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 don't 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 don't 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:
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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]
 
Sorry..for bumping...
But anyone...having any idea ..please reply...
 
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)
 
ank_gl said:
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)

Thanxx...
Belt/chain drive is not regarded as a single link
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...
 
nanunath said:
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...

what are the possible relative motions between a chain & a sprocket?

Hint: chain cannot slip on the sprocket
 

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