Our Prototype Ratcheting CVT

[Huck Banzai]

thread is from 2006, might not get an answer on this one

7 years; statute of limitations is up.

[demo 9]

I meant the op. havent seen a post from that username in a while

[jonKranked]

I meant the op. havent seen a post from that username in a while

Last Activity:11-04-2008 11:04 AM

[WestCoastHucker]

stalker...

[jlucas]

Just wondering if anything became of the ratcheting CVT project.
ZeroMax has a ratcheting CVT that they have in production, but the output is not "uniform". The fluctuating output speed of ratcheting designs tends to produce significant vibration/pulsation issues.
My first inclination, without seeing the design, is that it likewise, does NOT produce a uniform velocity output, but I was curious what the team had come up with.

[EVRAC]

The original Honda bike used a ratcheting cvt, and had the same issue. They solved this by using custom gears that were non-round to compensate, "rectifying" the output.

[jonKranked]

heh heh.... rectified output

[TrueScotsman]

Anyone got any idea what ever came of the IVT gearbox by Derek Lahr? To me it seemed to show a lot of promise.

EDIT- just found this;
http://scholar.lib.vt.edu/theses/ava..._DF_T_2009.pdf

Hmmm, very interesting!

[monroe123]

Anyone got any idea what ever came of the IVT gearbox by Derek Lahr? To me it seemed to show a lot of promise.

EDIT- just found this;
http://scholar.lib.vt.edu/theses/ava..._DF_T_2009.pdf

Hmmm, very interesting!

Not much has happened with the transmission/bike Derek built to work with it since 2009. There was a senior project the following year that was supposed to get the transmission ready for actual use (harden the design etc.) but they didn't make enough progress to use it for a go-kart like they had planned. Basically Derek is too busy building robots these days to spend the proper amount of time to get the thing working in a bike. Hopefully he gets his priorities straight and finishes it at some point.

[HardtailHack]

Haha he has a Lahr link in his sig, this was probably a scam as well.

[monroe123]

Haha he has a Lahr link in his sig, this was probably a scam as well.

Lahr ≠ Lahar there chief.

[HardtailHack]

Lahr ≠ Lahar there chief.

Ahh yes, wish I had an excuse.
Anyway it seems had not been seen for a while in 2010 too- http://www.ridemonkey.com/forums/f19...y-news-227811/

[Scrub]

Lahar Lahr pants on fire

[no skid marks]

Fricken Priorities.

[Nately27]

Fun to see interest in the CVT. The best video is from the fellas at pinkbike.com.

All the work that was done is covered in my thesis, except that one patent was awarded, and a second is applied for. I am working on graduating, and would love to get into the bike biz. Have to see how the cards play out.