A new shift concept for the engineers....

Discussion in 'Motorized Bicycle General Discussion' started by ferball, Jul 26, 2010.

  1. happycheapskate

    happycheapskate New Member

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    #241 happycheapskate, Nov 13, 2010
    Last edited: Nov 13, 2010
  2. captianroger

    captianroger New Member

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    better idea.....
    someont to make a jackshift that you can change gear ratios on the fly.....
     
  3. bairdco

    bairdco a guy who makes cool bikes

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    i almost forgot about this thread. another in a long list of things that have gone nowhere...
     
  4. Greybeard

    Greybeard New Member

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    If I wanted to eliminate the dual chain system and drive from the right side, and I may, I'd look at running through the crank hub. Many automatic car trans have shaft within shaft drives. A engine power hollow shaft running around the crank. On one end of the two you'd have to use a freewheel or oneway bearing. The only drawback is getting most of your gear reduction done on the engine drive side. A hollow tube shaft is nearly as strong as a solid one. Most of the engineering would be in the building building the shaft, and going through lots of bearing catalogs. It would present a problem of how fast you'd need to pedal to get anywhere, but I'm 68, have a Cellphone, if my MB has a problem, and two nice MTBs if I feel like pedalling around the neighbor hood.
     
  5. bairdco

    bairdco a guy who makes cool bikes

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  6. camlifter

    camlifter Active Member

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    the idea behind this thread was to have a single chain left side drive that would be powered by the engine and or pedals, and have gears. no jackshafts needed.
    i solved half the problem with my single chain left side drive build. someone just needs to come up with a multisprocket and derailer system for the rear wheel.
     
  7. corgi1

    corgi1 New Member

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    And there is no one here that can reverse engineer:confused: the right side derailer???(build it exactly in reverse)
     
  8. Greybeard

    Greybeard New Member

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    I was aware of the jackshaft systems that are available. My thinking was that most of the jackshaft systems end up kind of messy looking on the right side, and using the crank hub would clean that up. The drawback is trying to get a 15-1 gear reduction on the left side, and keep it clean looking. Probably just need a decent chain guard design.
     
  9. camlifter

    camlifter Active Member

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    if you use the BB as a jackshaft you will still need 2 chains. might as well just use 3 chains and the sbp tech already there. the whole idea is to just have one chain.
     
  10. Goat Herder

    Goat Herder Gutter Rider

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    Exactly(^)
     
  11. corgi1

    corgi1 New Member

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    You have to find the reduction for the motor too wheel in a transmisson somewhere ,be it open chain or closed in gears(or belt)that leaves bodywork for good looks and safty
     
  12. Goat Herder

    Goat Herder Gutter Rider

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    Why not keep it simple one chain to rule it all.(^)
     
  13. Goat Herder

    Goat Herder Gutter Rider

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    Torque is lost and extra moving parts are annoying in my opinion. The KISS principle:p
     
  14. Venice Motor Bikes

    Venice Motor Bikes Custom Builder / Dealer/Los Angeles

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    My thoughts exactly! :rolleyes:
     
  15. dmb

    dmb Active Member

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    honda trail and atc's had a 2 speed hi-low selector off the counter shaft. took em apart but i cant remember if its do able cheeply.
     
  16. ferball

    ferball New Member

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    Actually the idea behind the thread was to come up with an inexpensive way to easily change gear ratios. Before I totaled my bike and before winter hit I was actually running with two rear left side sprockets, the problem was chain tension. Switching from one sprocket to the next required to much chain for my tensioner to absorb. And my original thought was if some body came up with a decent spring load tensioner similar to the right side derailer than you killed two birds with one stone, minor shifting capabilities and the elusive chain tensioner grail. But then we got side tracked by internal hubs and jackshaft kits.
     
  17. jose Pinto

    jose Pinto Member

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    Goodnight guys, will come very enthusiastically following this increasing discussion and I think it's time to also give my contribution.
    on this date I'm finishing a project for a friend, it is the engine of a chopper bike nirve. As you are aware this bike team built a cube change (nexus 3 Brek coaster) and the idea was to make the cube move to switch gears,
    I think that is not new nor is it to invent anything (someone who has already said there is nothing to invent, because everything is already invented)

    [​IMG]
    [​IMG]
    [​IMG]
     
  18. silverbear

    silverbear The Boy Who Never Grew Up

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    Hello Jose,
    It is good to see you posting. Could you explain how this works? I don't understand, but sure am interested.
    SB
     
  19. jose Pinto

    jose Pinto Member

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    Hello Silverbear, is very simple ing motor output pinion transmits the movement and the large wheel siua transmit once on the right side to left side, 'for pos pedals do not rotate with the movement of the engine and also assist with pedal power brings together a one-way bearing, a wheel with 16 teeth fixed transmitted to the hub 3 speed and turn the other wheel 16 tooth chainring will send free, excuse my english
     
  20. NEAT TIMES

    NEAT TIMES New Member

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    HI jose Pinto

    I believe the same thing is accomplised with a 5/8" shaft with a large sprocket attached on the left side and two shaft support bearing and a STATON grooved adapter, a 3 prong sprocket and a free wheel sprocket like you show.

    That is, if the 3 speed hub sprocket free wheels like a coaster hub.

    Thanks for sharing, keep us posted if you would.

    Ron
     
    #260 NEAT TIMES, Nov 10, 2011
    Last edited: Nov 10, 2011

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