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Newbie needs help with chain!!

Discussion in 'Homebuilt and Modifications' started by Melvyn, Feb 7, 2017.  |  Print Topic

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  1. Melvyn

    Melvyn

    Region:
    North
    State/Country:
    China
    City:
    Hong Kong
    Ride:
    Quad
    I'm currently building a quad for university project. The quad is back-wheel drive and i have some problem to guide the chain to the back.

    The space in the middle is for the seat so chain has to go under. Yet the chain is too long and I want to use a guide and jackshaft.

    What should i buy to make the jackshaft? Or is there a better solution for the guide?
     
    Melvyn, Feb 7, 2017
    #1
  2. Melvyn

    Melvyn

    Region:
    North
    State/Country:
    China
    City:
    Hong Kong
    Ride:
    Quad
    7c8d84506ad8847060aafb30b7f6b8e2.jpg 530131ba54bbe1d5699441c6873234a2.jpg ba5fcda175f72b9ce16d0bbbb78c4a60.jpg
     
    Melvyn, Feb 7, 2017
    #2
  3. Melvyn

    Melvyn

    Region:
    North
    State/Country:
    China
    City:
    Hong Kong
    Ride:
    Quad
    jackshaft-1.jpg
    Jackshaft i want to build
     
    Melvyn, Feb 7, 2017
    #3
  4. Melvyn

    Melvyn

    Region:
    North
    State/Country:
    China
    City:
    Hong Kong
    Ride:
    Quad
    TB2C5XLcXXXXXa5XpXXXXXXXXXX-1799011241.gif
    The chain guide i found
     
    Melvyn, Feb 7, 2017
    #4
  5. A.D.

    A.D. #1 Custodian

    Region:
    SouthEast
    State/Country:
    TN
    City:
    Athens
    Ride:
    Reynolds T-Bone
    Name:
    AD
    :welcome: Melvyn! I've thought about your question, but haven't really come up with a decent answer yet. :mmm: My first thought is to use a pair of inline skate bearings (or similar) for the jackshaft, since they have an 8mm ID and it should be easy enough to cut-up a wheel into a shape you could mount on your trike.

    However in perusing the web as to how others have done it, I did trip across Making an HPV Jackshaft which may give you a few ideas. Also, this webpage Recumbent Trike Part 6: Making it Go has a brief section on how someone made a jackshaft.

    P.S.
    Kudos on your construction so far, it's a clean looking quad with some great welding. :thumbsup: However, your idlers look a bit weak so you might want to check out some on the Terra-Cycle website.
     
    A.D., Feb 8, 2017
    #5
    Melvyn likes this.
  6. Odd Man Out

    Odd Man Out

    Region:
    NorthWest
    State/Country:
    OR
    City:
    Portland
    Ride:
    homebuilt
    Name:
    Brent
    Odd Man Out, Feb 11, 2017
    #6
    Melvyn likes this.
  7. mpsurge

    mpsurge

    Region:
    Middle
    State/Country:
    OK
    City:
    Edmond
    Ride:
    Sun EZ-3 USX HD
    Name:
    Joel
    Forgive me for the lack of knowledge here, but after looking at the initial 3 images,,,
    In your design you have the rear axle/drive assembly on top of the frame. Would it not make routing the chain easier if the assembly was mounted to the bottom side of the frame? You could then use chain tubes to guide the chain much like a SUN EZ-3 USX and build a dual roller guide based on your front roller design and the rear chain tensioner.
    Sun-USX.jpg
     
    mpsurge, Feb 15, 2017
    #7
    Melvyn and A.D. like this.
  8. ReverendJim

    ReverendJim

    Region:
    NorthEast
    State/Country:
    NJ
    City:
    Hasbrouck Heights
    Ride:
    Linear, Rans
    Name:
    Jim
    In the square where your seat is going, I would mount a double idler set and do the same thing under the gear set. The chain will be flat under the frame. I did a double idler system to follow the contour of the frame I was building. If you look at how the chain flows in the picture it might give you an idea of how to run your chain and keep tension. Hope it helps.
    Jim

    IMG_0308.JPG
     
    ReverendJim, Jul 6, 2017
    #8
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