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Planetary spur gear problem!

  1. Nov 27, 2011 #1
    1. The problem statement, all variables and given/known data
    Hi

    I am doing this gear problem, I have attached the question and how I've started this off I am having problems working it all out as the question said I should try and have the casing rotating at a speed of 15-25 rpm.

    I have, these gear sizes which were obtained from a manufacturers catalogue.

    TB = 36
    TC = 24
    TD = 40
    TE = 80
    NX = 100 rpm
    NY = 350 rpm

    3. The attempt at a solution

    To work out the number of teeth on casing F, from the geometry of the figure
    dF/2 = dE/2+dB
    so dF= dE + 2dB
    dF= 80+ 2(40) = 160 teeth.

    Using my my table of motion which I have attached for the speed of gear F, there is a mistake on it as the 2 TC's cancel out to end up y-x*(TB/TF) I have used the input speed for x and the output speed for y so my equation works out as 350-100 * (36/160) = 327.5 rpm this is obviously very wrong. Where have I went wrong? Have I started at the wrong point?

    Thanks in advance.
     

    Attached Files:

  2. jcsd
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