In an attempt to better understand how the durability of a belical gearset is affected by changes in profile (mp) and face
contact ratio (mp), an analytical investigation was done in which mp was varied in levels of 1.1, 1.6, 2.1, and 2.6 and mF
was varied in levels of0, 0.6, 1.1, 1.6, 2.1, 2.6, 3.1, and3.6. Thirty -two combinations were studied in total. The gears
were modeled using the hybrid finite element computational method Contact Analysis Programming Package (CAPP),
of Advanced Numerical Solutions. CAPP was chosen for this analysis since it has the ability to calculate both bending
and compressive stresses in gear teeth without the use of a supercomputer.
The results of this analysis suggest that for a given level of face contact ratio, an advantage in bending and compressive
stress exists at the mp: =2.1 level over all of the others considered, No such optimum level was found for face contactratio
in this study. As the helix angle and nqp were increased, the maximum bending stresses increased due to the increases in
normal tooth load and compressive stresses decreased due to the increases in normal face width. Increasing both mp and
mp had the effect of smoothing out the bending and compressive stresses when viewed as a function of roll angle.
AGMA 95FTM9-1995 pdf download
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