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  • Gear Designs Stepchild: Root Fillet Configuration

    1.5 credits offered

    This webinar will address the design details and pitfalls related with the gear tooth fillet configuration NOT just the fillet radius specification. Often this parameter is not specified at all or only minimally noted on the engineering drawing. In fact, it is one of the most important factors in determining the actual bending strength of the gear tooth. In this regard, we will discuss the various types of fillet forms including full trochoidal, corner radius trochoidal and full circular. Superimposed on these is the complicating detail of undercut which is developed either unintentionally due to tooth number and pressure angle conditions or intentionally to allow finishing the tooth flanks only (i.e. by flank grinding, lapping, honing, hard cutting, etc.) without creating a step in the critical section region. The very powerful effect of the fillet configuration will be demonstrated by actual calculation using various fillet configurations for the same basic tooth configuration. We will see that the specifics of the fillet configuration can affect the tooth strength by 50% or more. In addition, we will also address the actual deleterious effects of a step at the root upon tooth bending fatigue strength. This effect is a function of the location, depth and radius at the corner of the step and can vary greatly. To implement this knowledge, we will close with a presentation of the proper drawing call out for complete fillet configuration control that will insure maximum and more importantly, consistent and repeatable tooth bending strength.

  • Gear Microgeometry Based Load Distribution for Gear Noise, Dynamics and Design Assessments

    1.5 credits offered

    This webinar will demonstrate techniques for using the gear microgeometry to minimize noise excitations and also to evaluate the gear contact stresses, bending stresses and tribological factors such as film thickness and flash temperature. The gear pair used in this study is the high speed ratio of the NREL-GRC wind turbine gearbox. In addition to the load distribution analysis, we shall explore ways of using load distribution analysis to come up with new macrogeometries that perform as well or better than the original design. Finally, a simple dynamic analysis of the gear set will be performed to observe the response of various natural frequencies to a transmission error excitation.