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Our Prototype Ratcheting CVT

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

  1. Nately27

    Nately27 Monkey

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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 -   May 5, 2006

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  2. S.K.C.

    S.K.C. Turbo Monkey

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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...:)
     
    #2 -   May 5, 2006
  3. Castle

    Castle Turbo Monkey

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    keep it up homey, I'm waiting on my rig! haha
     
    #3 -   May 5, 2006
  4. dcamp29

    dcamp29 Monkey

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    thats super cool- what are you doing this for? school?
     
    #4 -   May 5, 2006
  5. MikeT

    MikeT Monkey

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    si, senior design project;)
     
    #5 -   May 5, 2006
  6. EVRAC

    EVRAC Monkey

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    Very, very cool.

    Keep up the good work.
     
    #6 -   May 6, 2006
  7. Gyro

    Gyro Chimp

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    Nice work guys!

    I'm glad the prototype came out so well. It looks really great.
     
    #7 -   May 7, 2006
  8. dhkid

    dhkid Turbo Monkey

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    danm wmp cant play it. what codec is it using?
     
    #8 -   May 7, 2006
  9. EVRAC

    EVRAC Monkey

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    Try right-click "Save target as" and then play it.
    Wouldn't stream for me, but worked that way.
     
    #9 -   May 7, 2006
  10. Nately27

    Nately27 Monkey

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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.
     
  11. ghettogt76

    ghettogt76 Monkey

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

    dw Wiffle Ball ninja

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

    jlucas Chimp

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

    Sonic Reducer Monkey

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

    demo 9 Turbo Monkey

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

    Huck Banzai Turbo Monkey

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

    demo 9 Turbo Monkey

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

    jonKranked Press Button, Receive Stupid

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  19. WestCoastHucker

    WestCoastHucker Turbo Monkey

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    stalker...
     
  20. jlucas

    jlucas Chimp

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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.
     
  21. EVRAC

    EVRAC Monkey

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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.
     
  22. jonKranked

    jonKranked Press Button, Receive Stupid

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    heh heh.... rectified output
     
  23. TrueScotsman

    TrueScotsman Monkey

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    #23 -   Jan 20, 2013
    Last edited: Jan 20, 2013
  24. monroe123

    monroe123 Chimp

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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.
     
  25. HardtailHack

    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.
     
  26. monroe123

    monroe123 Chimp

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    Lahr ≠ Lahar there chief.
     
  27. HardtailHack

    HardtailHack used an iron once

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  28. Scrub

    Scrub Turbo Monkey

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    Lahar Lahr pants on fire
     
  29. no skid marks

    no skid marks aggressive with a small knob

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    Fricken Priorities.
    :nope:
     
  30. Nately27

    Nately27 Monkey

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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.
     
  31. Nately27

    Nately27 Monkey

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