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I think....... Posted by Cmyles [Email] (#1126) [Profile/Gallery] (more from Cmyles) on Fri, 9 Jan 2015 10:18:52 In Reply to: What about the text screen-shot? Anybody knows that?, Siegfried, Fri, 9 Jan 2015 06:19:05 Members do not see ads below this line. - Help Keep This Site Online - Signup |
I've pondered this for a while and I think that the staggering of the sprocket teeth was probably done to prevent the ends of the link pins from making contact and maybe to allow the chains to be spaced closer together. A huge part of automotive engineering relates to reducing noise and if those pins made even light occasional contact I suspect there would be audible noise not to mention the potential for accelerated wear and failure. The chains wrap around the sprockets pretty effectively, about 50% of the circumference (as Zig pointed out), so you wouldn't really spread the load, stress or periodic shock by staggering them.
Of course preventing interference makes an even stronger argument for staggering the chains than the "shock spreading" concern.
What about stacking individual sprockets? Seems like single sprockets could be made at a lower cost and easily designed to stagger the chains properly. The lower chainwheel would be a breeze, the upper would be a challenge. They could probably be welded together and hardened after machining too.
If this was a (modern) motorcycle it would have a toothed belt anyway (ha ha)!
Peace, out.
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