The Effect of the Dynamic Contact Loads and Tooth Surface Hardness on the Running Life of an Engaging Spur Gear Pair

摘要

When the size of the driving gear is smaller than that of the driven gear,fatigue damage of the driving gear will dominate the running life of the gear pair.In general,the tooth surface hardness of the driving gear will be increased to extend the running life of the gear pair by the experience of engineers.In this paper,according to ANSI/AGMA 2001-B88 and the dynamic model for an engaging gear pair,the hardness will be tuned to let the driving and driven gears have the same running life.In the dynamic model,the parameters include mesh stiffness,frictional coefficient,and profile-shifted factor,etc.The standard,ANSI/AGMA 2001-B88,provides the value of the endurance limit related to the bending fatigues.According to the standard,the endurance limit is a function of tooth surface hardness.A computational algorithm is developed to simulate the bending stresses.The results present how the tooth surface hardness of gears influences the running life of a spur gear pair.