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Overlap ratio or axial contact ratio in helical gears

  1. Jun 25, 2014 #1

    I am trying to understand the Overlap Ratio (OR) / axial contact ratio of a helical gear pair. Unlike transverse contact ratio, I am unable to understand OR so easily.
    What does it mean if the OR is exactly 1? What will happen practically when it goes less than one? Thanks.
  2. jcsd
  3. Jun 25, 2014 #2


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  4. Jun 26, 2014 #3
    Thanks. But this book again tells the OR as a mathematical relation whereas I want to understand it physically. I assume a case where the transverse contact ratio is more than 1 already and want to know the effect when OR is less that one.
  5. Jul 2, 2014 #4


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    Last edited by a moderator: May 6, 2017
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