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  • Calculate gear strength

    Discussion in 'Calculations' started by PutJ, Feb 7, 2013.

    1. PutJ

      PutJ New Member

      Jan 2013
      Likes Received:
      Hi all,

      I would like to know how strong my designed gears will be. Is there anyone who can help me out with these calculations?

      It will be a 18tooth involute (evolvent) gear in module 4. The tooth surface will be 40mm deep (or 50mm if needed) and it will be produced from Toolox 44 (1450Nm tensile strength). The pressure angle is 20drgs.

      It will be connected to a 22tooth gear idler, which will be connected to a 27 tooth driven gear.

      Is there any way of calculating the strength of the gears? Or are there more variables needed?

      Other values that I got from the manufacterer are:
      44hrc (for heat treatment?)
      roughness is about 1,4 Ra

      Thanks in advance! :)
    3. PierArg

      PierArg Well-Known Member

      Mar 2013
      Likes Received:
      I just joined this forum.

      To solve your question you need to know how the gears work: for example the transmitted power, the power required by the final application, the input/output rotation speed, etc.
      This is important to define the forces on the teeth.

      If you can insert an image or just a simple scheme it would be easy to help you.

      By the way you need to verify your teeth in two ways:

      1) Static dimensioning
      a) Lewis's formula to calculate the bending resistance under the max transmitted power.
      b) Hertian contact pressure under the max transmitted power

      2) Fatigue dimensioning
      For this section you can use different standard codes such as:
      UNI 8862
      ISO 6336
      The fatigue dimensioning follows the same calculation of the static dimensioning (bending and surface contact pressure) but it introduces a series of empirical correction factors.

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