anyone know what cvt this EV uses?

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AMPrentice
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anyone know what cvt this EV uses?

Post by AMPrentice »

Image

http://www.rqriley.com/t-car.html

http://www.rqriley.com/urba-e.html

It seems ideal to use a cvt with an electic motor only spinning at its ideal rpm range.

Doesnt this eliminate the need for an expensive controller?
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woody
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anyone know what cvt this EV uses?

Post by woody »

From the article, the town car uses the standard VW gearbox. The other article was a bit light-on for details. The picture looks like a VW too. Designs are from 1977 and 1981!
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AMPrentice
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anyone know what cvt this EV uses?

Post by AMPrentice »

Yet there is a custom billet like cvt instead of a bug box on top of this chassis in the image and a custom square tube one at that instead of vw. I just wonder if its a custom unit made for snowmobiles or a DAF one?
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anyone know what cvt this EV uses?

Post by Taffy »

That chassis looks seriously unstiff. Interested in the CVT though...
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anyone know what cvt this EV uses?

Post by Benonymous »

Ahh yes, the seductive CVT...

The CVT on this awful chassis appears to be of the "cone and belt" variety. This is a similar setup to the DAF. The DAF transmission is somewhat more compact than this one though Image

Other sources of modern CVT's are Honds Civics and a couple of domestic Japanese cars (Nissan think). The CVT's are supplied by Jatco and are a belt and cone type but the belt is made up of lots of little wedge shaped plates. It must have a wire cable through it to hold it all together. The belt is lubricated and runs on metal cones which expand and contract in opposition to eachother to create the infinite gear ratios.

A CVT sounds like the ideal companion to an electric motor. You can vary the gearing to suit the output power of the motor and theoretically have an overdrive, if the motor would pull it. The downside is the weight. The Jatco transmission fitted to the Civic weighs in at a hefty 65Kg. As it is unnecessary to have a transmission on a lot of conversions, this is a big weight hit and would require you to think about your gross weight when the vehicle is finished.

I was quoted $2400 for a complete transmission from a jap importer. Flippin' steep if you ask me!
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anyone know what cvt this EV uses?

Post by Taffy »

Thanks for the info there Ben.
The question would be how fast do you want to be able to go? With no transmission you will be restricted by the falling torque vs speed not generally many would worry about so the general idea would be not worth the $$ or the kg.
Example:
diff of 1:3.7 and wheels 0.56m (Dia) warp 9 you wont get past 120kph
The figures being:
80kph Req:13.8kw Motor speed:2804rpm Available:67.1kW
100kph Req:22.3kw Motor speed:3505rpm Available:52.9kW
110kph Req:27.6kw Motor speed:3856rpm Available:45.8kW
120kph Req:33.9kw Motor speed:4206rpm Available:38.8kW
130kph Req:41.1kw Motor speed:4557rpm Available:31.7kW
140kph Req:49.4kw Motor speed:4907rpm Available:24.6kW
This is using 'offical' power (@96V i believe) figures as the constant and up speccing by ratio to show peak performance.

These are for a lotus 7 (frontal area and cd) and only show power to maintain speed and not acceleration.
Showing the standard 3.7 diff
Image

Changing to a 3.0 ratio diff
Image

Changing to a 2.5 diff ratio
Image

Changing to a 2.0 ratio diff
Image
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