Dynamic Load Factors in Internal Spur Gear Drives

A comprehensive computer-based methodology was developed exclusively for the static and dynamic load analysis of internal spur gear (ISG) drives. An iterative procedure was applied to solve the statically indeterminate problem of multitooth pair contacts, load sharing, and operational contact ratios as influenced by both the gear mesh and the radial deflections of components. This methodology can be applied to involute and noninvolute spur gearing as well as to the very high contact ratio gearing. The performd parametric studies indicate that internal spur gear drives have considerably better dynamic performance (lower dynamic load factors) over equivalent external spur gear drives. Much of this improvement is due to the inherently higher contact ratios in the ISG drives.