A BALANCED MAXIMUM FILLET STRESSES ON NORMAL CONTACT RATIO SPUR GEARS TO IMPROVE THE LOAD CARRYING CAPACITY THROUGH NONSTANDARD GEARS

This article presents an idea to remove the inequality in maximum fillet stresses developed between pinion and gear of a step up gear drive. This uniform fillet strength of the gear drive can be achieved by using nonstandard pinion and gear with appropriate addendum modifications generated by nonstandard basic racks of respective tooth thickness not equal to 0.5 pi m at the pitch circle. The influence of gear parameters such as gear ratio, pressure angle, addendum factor, pinion teeth number, and addendum modifications on the maximum fillet stress on the nonstandard pinion and gears of different tooth thickness has been analyzed through finite element method and finally the optimum value of rack tooth thickness coefficients (k(pc) and k(gc)) are suggested for the given gear drive ( defined by i) that improves the fillet capacity in bending. This study has been extended for various drives like S-std, S-o, S+, and S(-)drives.