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Hydro-peneumatic hybrid drivetrain and brake system

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Old 11-05.-2007, 11:22 PM   #31
JohnO
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Default Re: Hydro-peneumatic hybrid drivetrain and brake system

Yep, that"s the one weakness, and that's why they use a fricton belt on CVT transmissions. Couldn't maintain a constant spacing between the ridges.


OTOH, the entire unit could be sealed. Some motorcycles have the chain entirely encased so it can run in an oil bath - no reason a lightweight enclosure couldn't be developed to keep water and mud off of the belt and cones. It wouldn't have to be entirely waterproof, just enough to deflect whatever was being splashed around.


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Originally Posted by dabac
I'm sorry to rain on (part of) your parade, but that wouldn't work if you want continuous adjustability. The spacing between the chain ridges would have to match up against the spacing of the cone ridges. But the cone ridge spacing would be dependent on the distance from the center.
I suppose one could set up some sort of stepped interval, but I predict nasty crunching on gear change....

Maybe one could have a finely ridged belt, and then the cone surfaces covered with a polyurethane coating tough yet soft enough to provide grip for the belt.
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Old 12-05.-2007, 01:35 AM   #32
dabac
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Default Re: Hydro-peneumatic hybrid drivetrain and brake system

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Originally Posted by JohnO
Yep, that"s the one weakness,


Years ago I was toying around with the idea of sort of a shaft drive worm gear, where you'd move the little cog closer or farther away from the circumference according to what ratio you wanted. I was really pleased with my line of thought until the impossibility of achieving a gradual increase in the number of cogs eventually dawned on me....

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OTOH, the entire unit could be sealed. .. It wouldn't have to be entirely waterproof, just enough to deflect whatever was being splashed around.


That's an intriguing thought. I wonder where you'd end up size-wise though, if pedal and rear stay spacing would actually allow for such a design. And what are the forces involved, how much does it take to force the cones together?
Any guess about what tension the belt runs at?
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