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Our Prototype Ratcheting CVT

Discussion in 'Downhill & Freeride' started by Nately27, May 5, 2006.

  1. Nately27 New Member

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    as an excerpt from the gearbox thread:
    A couple of us here, miket and others, have been working on a ratcheting CVT. Our first fully functional prototype was finished last week. It has a gear ratio from 1 to 3, and should have a completely uniform output (although we havent hooked up a DAQ system yet).

    video
    I would suggest turning down the volume, a bunch of guys start yellin halfway through... the input is not constant, so its tough to see the speed increase, especially from that angle.

    Its still overweight and oversized for a bicycle, but at this stage it should handle 120[ft-lbs]. So we're still happy with it.
    #1
  2. S.K.C. Active Member

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    Hey - looks pretty cool.

    Just remember - don't show off too much if you have some P.A.F. stuff in the works for the near future...:)
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  3. Castle New Member

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    keep it up homey, I'm waiting on my rig! haha
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  4. dcamp29 Member

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    thats super cool- what are you doing this for? school?
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  5. MikeT New Member

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    si, senior design project;)
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  6. EVRAC Member

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    Very, very cool.

    Keep up the good work.
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  7. Gyro New Member

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    Nice work guys!

    I'm glad the prototype came out so well. It looks really great.
    #7
  8. dhkid New Member

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    danm wmp cant play it. what codec is it using?
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  9. EVRAC Member

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    Try right-click "Save target as" and then play it.
    Wouldn't stream for me, but worked that way.
    #9
  10. Nately27 New Member

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    its an avi file, so should play in quicktime or winamp, I'm gonna try to get another video up today, with some pics too.
    #10
  11. ghettogt76 New Member

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    That's awesome! One hell of a senior design project!!
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  12. dw Wiffle Ball ninja

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    Nice work Nate, good to see it!
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  13. jlucas New Member

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    I was wondering if you have the ratcheting CVT video posted somewhere that I can access without authorization?
    #13
  14. Sonic Reducer New Member

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    +1, says authorization required.
    what are your future plans for the project?
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  15. demo 9 Active Member

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    thread is from 2006, might not get an answer on this one
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  16. Huck Banzai Active Member

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    7 years; statute of limitations is up.
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  17. demo 9 Active Member

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    I meant the op. havent seen a post from that username in a while
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  18. jonKranked Press Button, Receive Stupid

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    #18
  19. WestCoastHucker Active Member

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  20. jlucas New Member

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    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.
    #20
  21. EVRAC Member

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    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.
    #21
  22. jonKranked Press Button, Receive Stupid

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    heh heh.... rectified output
    #22
  23. TrueScotsman Member

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    Last edited: Jan 20, 2013
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  24. monroe123 New Member

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    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.
    #24
  25. HardtailHack used an iron once

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    Haha he has a Lahr link in his sig, this was probably a scam as well.
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  26. monroe123 New Member

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    Lahr ≠ Lahar there chief.
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  27. HardtailHack used an iron once

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    #27
  28. Scrub Active Member

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    Lahar Lahr pants on fire
    #28
  29. no skid marks Active Member

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    Fricken Priorities.
    :nope:
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  30. Nately27 New Member

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    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.
    #30
  31. Nately27 New Member

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    amen to that. I often wonder if I have mine straight...
    #31