On the dynamic loading of gear teeth as affected by journal motion in a hydrodynamic bearing-rotor-gear pair system

Abstract

The paper is an attempt to include the effect of journal motion and the oil film forces on the determination of dynamic gear tooth loading in a hydrodynamic bearing-rotor-gear pair system. A mathematical model has been developed which relates dynamic loads on the teeth of an involute spur gear pair to the instantaneous state of the pinion journal centre in the oil film space and various bearing parameters. The direction of instantaneous line of action is determined from kinematic considerations. effects of both the full-film (360 degrees) and the cavitated π-film models of the journal bearing are used to arrive at the aforementioned relationships. Dynamic loads on gear teeth as well as on bearing film have been calculated when the journal traces certain specified paths in the clearance space. Some of the results emphasize the importance of coupling gear analysis with bearing analysis. © 1989.