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Torque Calculation

  1. Feb 19, 2009 #1
    1. The problem statement, all variables and given/known data

    Need to find input torque, output torque and input torque (omega) all NM

    Data i have is

    Input RPM = 9700
    Output RPM = 1950

    GEAR 1 = 12, 2 = 40, 3=30, 4=20 (Radius) with module 2 (x 2 for diameter)

    Power = 2.3Kw

    2. Relevant equations

    Turn power to H.P giving 3.083 H.P


    (63025 * H.P) / R.P.M = T

    T = 20.1Nm

    Ang Velocity

    V(omega)input = R.P.M in * 2pi/60 = rad/s

    V(omega)output = R.P.M out * 2pi/60 = rad/s

    Input Rad Torque

    T(omega) in = V(omega)in * Torque

    3. The attempt at a solution

    I would say the torque is 20.1Nm

    I am getting confused with these torques,

    Situation is a 2 stage gearbox, and torques need to be found, including angular torque, but cant seem to find the formulas i really need.

    Pretty simple i am sure, but its not clicking for me right now.
    Last edited: Feb 19, 2009
  2. jcsd
  3. Feb 23, 2009 #2
    We have talked about this one before, Herpamad. Why do you continue to post it?
  4. Feb 25, 2009 #3
    Because i doubt myself too much.

    I got units confused and needed to know where i was going wrong very quick.

    Turned out that the example i followed has used the wrong output units.

    They said Nm where as it should have been Ft Ib.

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