Theory of critical distances in analysis of the influence of tooth profile on gears bending capacity

Abstract

The fatigue cracks and failures in tooth roots are still one of the most common problems in gear pairs operation.Therefore, the application of new methods and up-to-date calculation procedures is welcome. This paper presents thebenefits which Theory of Critical Distances (TCD) could make in creation the more precise and applicable calculationprocedure for gears bending capacity. The new procedure described in this paper completely excludes all conventionalstandard defined calculation procedures. One particular spur gear pair for large transport machine is used for procedurepresentation. Few different values of tooth root radius and profile shift (modification) coefficients are considered. The FiniteElement Analysis for gear pairs with different profile parameters are performed and obtained stress states are used for TCDapplication. The conclusions about the influence of tooth profile parameters on tooth root fatigue capacity and suggestionsabout application of TCD are discussed.