DIAGNOSTICS OF PLANET GEAR FAULTS FROM THE EFFECTS OF MESHING WITH THE RING AND SUN GEARS

摘要

A simplified 18 DOF transverse-torsional lumped parameter model (LPM) was developed to simulate gear faults such as tooth cracks and spalls in a planet gear of the UNSW planetary gearbox. The effect of the two simultaneous meshes of the planet gear with the ring and sun gears was investigated since the contact with the two gears is on opposite flanks of the planet gear tooth. The simulated results clearly differentiated the two types of faults with reduction in the stiffness due to a tooth crack visible in both contacts whereas a spall on one flank showed up only in one contact. The simulated vibration signals showed good correlation with the measured signals.