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Chain Drives

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moonlite

03-09-2003 04:16:46




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In observing worn sprockets from chain drives whenever there is a great amount of difference in the size of the sprockets it appears that the larger one is more worn than the smaller one. I would appear that the wear should be greater on the small one as each tooth contacts the chain more times and there are fewer teeth to bear the load. When the small one is the driven one there is greater torque applied to it. Perhaps something about the tendancy for the chain to follow the sprocket? Lets hear from those of engineering experience.

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Norm

03-09-2003 09:36:09




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 Re: Chain Drives in reply to moonlite, 03-09-2003 04:16:46  
Never thought about it, but I'll take a shot at it. My experience on both motorcycles and bicycles was that, true, the larger sprocket wore quicker on both even though on a bicycle, the large sprocket drives and on the motorcycle, the smaller sprocket drives. Sprockets wear because of worn chains moving against the teeth and the larger sprocket gives more area for the chain to move in relation to the sprocket tooth. We guaged chain wear by how far you could lift the (snug) chain off the large sprocket teeth, almost none on the small sprocket.
Norm

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greenbeanman

03-09-2003 05:55:34




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 Re: Chain Drives in reply to moonlite, 03-09-2003 04:16:46  
I'm no engineer, but I'm guessing it is because a large diameter sprocket will have chain contacting 220 degrees or so of sprocket, while the angle of approach difference to the smaller sprocket will allow only 170 or so degrees of contact on the smaller one. Kind of like pulling the chain deeper into the teeth of the larger one, and shallower into the smaller one.

I don't know if it would make any difference, but I would also expect that the smaller one would usually be driven sprocket rather than doing the driving.

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