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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Mark Cooper Rapide Electric Starter
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<blockquote data-quote="timetraveller" data-source="post: 164783" data-attributes="member: 456"><p>Roger, to make it clear the double sided tooth belt drive I designed was to drive a telescope built in 1860 and about five metres long, weighing well over a tonne to be interfaced to a modern stepper motor drive and controlled by a computer. On the alternator kits I supply, known as the Walkernator, I use a poly vee belt to drive the 40 amp alternator, definitely not a toothed belt, as they are known to destroy the Vincent dynamo drive sprocket. To revert to the original 'starter' theme; a lot of modern bikes use a shock absorber built into the sprocket at the back of the clutch. These are rather like car clutch shock absorbers with two sets of springs, some working in one direction and the other set in the other direction. I can't see that it would be too difficult to build that type of shock absorber into a belt primary drive and thus get rid of any shock loads. The outer teeth of the belt could be used to drive an alternator in the normal dynamo postion. I would be worried about using a starter motor on the outside teeth of the belt as it would take some design trick to ensure that the starter torque was spread over several teeth of the belt. If only one or two teeth were used then I imagine they would have a short life. Although you want a dry primary drive there are plenty of different materials available in the toothed belt market and it should be possible to find one that will withstand oil. Come back to me on this if this is of any use to you.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 164783, member: 456"] Roger, to make it clear the double sided tooth belt drive I designed was to drive a telescope built in 1860 and about five metres long, weighing well over a tonne to be interfaced to a modern stepper motor drive and controlled by a computer. On the alternator kits I supply, known as the Walkernator, I use a poly vee belt to drive the 40 amp alternator, definitely not a toothed belt, as they are known to destroy the Vincent dynamo drive sprocket. To revert to the original 'starter' theme; a lot of modern bikes use a shock absorber built into the sprocket at the back of the clutch. These are rather like car clutch shock absorbers with two sets of springs, some working in one direction and the other set in the other direction. I can't see that it would be too difficult to build that type of shock absorber into a belt primary drive and thus get rid of any shock loads. The outer teeth of the belt could be used to drive an alternator in the normal dynamo postion. I would be worried about using a starter motor on the outside teeth of the belt as it would take some design trick to ensure that the starter torque was spread over several teeth of the belt. If only one or two teeth were used then I imagine they would have a short life. Although you want a dry primary drive there are plenty of different materials available in the toothed belt market and it should be possible to find one that will withstand oil. Come back to me on this if this is of any use to you. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Mark Cooper Rapide Electric Starter
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