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Figuring out gear ratios

  1. Feb 8, 2009 #1

    ss7

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    Hey guys, I am trying to determine which gear ratio is best to use for my project. We have 2 cars attached by rope, and whichever pulls the other one on its side, that car wins.

    We are given a motor with the following specs:

    rpm@torque=3500
    rpm stall torque=0.61Nm

    So I was wondering if there is a procedure/formula to determine the best gear ratios for optimum torque transfer to the shaft/wheel, considering the given motor specs?
     
  2. jcsd
  3. Feb 8, 2009 #2

    ss7

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    Any help guys? or at least links to info? That would be greatly appreciated!
     
  4. Feb 9, 2009 #3
    its not a point of optimum torque transfer, but torque requirement. how much do you think your opponent is going to get? Is other team given the same motor?
    Your motor should have more torque than the opponent's(assuming same car size), to pull the other car.
     
  5. Feb 9, 2009 #4
    How much torque is required to overcome breakaway friction? Any torque over that value will be wasted. (In other words, once you start spinning your wheels, more torque won't do you any good.)
     
  6. Feb 10, 2009 #5
    yea that too!! i missed that point:approve:
     
  7. Feb 11, 2009 #6
    If you are having a tugging competition generally the lowest ratio will win, experimenting with the weight of the vehicle to make sure you don`t loss traction to optimise the torque output. keep in mind the fact you will be pulling another vehicles weight, take that into account when you do tests for traction loss.
    The best people to talk to would be 4 wheel drive specialists
     
    Last edited: Feb 11, 2009
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