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Homework Help: Calculate shaft for gears

  1. Oct 5, 2012 #1
    1. The problem statement, all variables and given/known data
    Already calculated:
    Tangential Forces :

    Pinion A=2850 N
    Gear B=2850 N
    Pinion C= 8550 N
    Gear D= 8550 N

    Radial Forces:

    Pinion A= 1000 N
    Gear B= 1000 N
    Pinion C= 9100 N
    Gear D= 9100 N


    Pinion A= 60mm
    Gear B= 180mm
    Pinion C= 60mm
    Gear D= 200mm

    The distances between Gear B and Pinion C for the moment can be said to be X(mm). and the distance between the gears and bearings can be said to be Y(mm).

    2. Relevant equations
    Moment = F*d

    3. The attempt at a solution
    I've attached a picture of how the gears/shaft/bearings are arranged.
    My question is how do i calculate the shaft diameter(s)

    using the moment formula i know that i can calculate torque for each gear. It would just be the tangential force*the radius of the gear. I have no clue what to do with the radial loads or if I need to calculate any other forces.

    any help?

    Attached Files:

  2. jcsd
  3. Oct 5, 2012 #2
    just worked out the torque for each gear:

    Pinion A: 85.5 Nm
    Gear B: 256.5 Nm
    Pinion C: 256.5 Nm
    Gear D: 855 Nm

    not sure what to do with these...
  4. Oct 6, 2012 #3


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