Post manual CVTs.

"bhtooefr" (bhtooefr) 07/02/2017 at 13:33 • Filed to: cvt, transmission, save the manuals

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Yes, I said manual CVTs.

Edit: Here, let’s have a video that shows how that one actually works:

PS9 > bhtooefr 07/02/2017 at 13:36

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Manual CVT...wat

Brickman > bhtooefr 07/02/2017 at 13:47

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My riding mower is a manual CVT :P

bhtooefr > PS9 07/02/2017 at 13:50

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So, a CVT is a continuously variable transmission - that doesn’t actually specify how it’s varied, just that it can be varied.

The first CVTs were varied manually - in the case of this Zenith motorcycle, it worked by the crank handle adjusting the driver pulley’s width mechanically, as well as changing the motorcycle’s wheelbase to compensate.

Modern scooter CVTs shift using counteracting centrifugal forces, and are automatic, through a mechanical approach. (This was, I believe, first used on Salsbury scooters in 1938, and basically everyone since then copied the general idea. Salsbury actually ended up making CVTs for snowmobiles after getting out of scooters in the early 1950s, and now Comet owns what’s left of them.)

Modern car CVTs shift using hydraulic pressure, I believe, which is modulated, ultimately, by a computer. Mechanically, these are actually closer to the manual CVTs, and it would be possible for a manual but still continuously variable shift program to be made for one of these.

And, then, of course, there’s different ways to make a CVT than just the variable diameter pulley approach - some inherently have automatic shifting, some don’t. But, the VDP approach doesn’t, hence a manual being possible.

bhtooefr > Brickman 07/02/2017 at 13:51

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Yeah, that’s actually the most common application that I can think of - a manual hydraulic CVT.

TheBimmerGuyWhoNowOwnsAChevy > bhtooefr 07/02/2017 at 15:09

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Manual CVT? Brain machine broke

Cé hé sin > bhtooefr 07/02/2017 at 15:40

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Cartercar friction drive

bhtooefr > Cé hé sin 07/02/2017 at 15:46

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I take issue with the “no clutch to slip” in that ad, given my understanding of how it works... but yeah, I figured you’d come up with something delightfully weird like that.

Cé hé sin > TheBimmerGuyWhoNowOwnsAChevy 07/02/2017 at 15:58

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Garden tractors. They usually have hydrostatic drive. Press the pedal harder and a higher gear (in either direction) is produced so manual CVT.