Adapting a scooter cvt to an ebike motor ?

qwerkus

10 kW
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Jul 22, 2017
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Has this been done before ? Keeping the optimum motor rpm would certainly increase motor efficiency. I guess the heavy flywheel weights could be a problem, but maybe they could be replace by some other form of automatic spring ?
 
qwerkus said:
Has this been done before ? Keeping the optimum motor rpm would certainly increase motor efficiency. I guess the heavy flywheel weights could be a problem, but maybe they could be replace by some other form of automatic spring ?

I think forum member "gwhy" has experience with this.. but I haven't seen him on the forum in a while.. maybe search his posts or try to PM him.. also maybe try a google search of the forum for "cvt"..

https://www.google.com/search?&q=cvt+site:endless-sphere.com
 
efMX Trials Electric Freeride said:
I think forum member "gwhy" has experience with this.. but I haven't seen him on the forum in a while.. maybe search his posts or try to PM him.. also maybe try a google search of the forum for "cvt"..

https://www.google.com/search?&q=cvt+site:endless-sphere.com

Thank you for the quick reply. I saw his 50cc scooter conversion thread; unfortunately the pictures seem dead. Otherwise most interesting.
 
Although you can let the electric motor run in it's most efficient rpm range, the CVT will destroy that efficiency (and then some...) by it's parasitic power consuming belt system.
 
SlowCo said:
Although you can let the electric motor run in it's most efficient rpm range, the CVT will destroy that efficiency (and then some...) by it's parasitic power consuming belt system.

Interesting point, but aren't Pulley type CVT supposed to be super efficient (like 93-97%). That would be comparable to most IGH.
 
CVT's with a centrifugal clutch and rubber belt only have an efficiency of 65-75%:

https://autotechreview.com/technology/tech-update/making-sense-of-two-wheeler-fuel-efficiencies

https://www.quora.com/What-are-the-...ransmission-and-a-typical-5-6-speed-automatic

https://www.bikesmedia.in/reviews/why-the-cvt-engines-tend-to-return-poor-fuel-efficiency.html

By mounting the electric motor direct, without the centrifugal clutch, to the CVT you might gain a little efficiency. But using a DD hub motor with thin laminations or a mid motor with chain will prove to be much more efficient still.
 

showing one method of using an electric motor driving the input to a CVT (failbrook) with a pedaled input on it's own freewheel.
-the red chain is the transmission output
-the green chain is the motors' input
-the black chain is the pedal input
 
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