Failure of planetary pinions in earth moving equipment- a failure analysis approach

摘要

A series of failures of planetary pinions occurred inthe final drive epicyclic gearbox of large trucks used inunderground mining. A metallurgical analysis indicated that failurehad occurred by internal rupture of the gear. This was attributed topoor heat treatment procedures used in case hardening the gear.This had induced high residual stresses just below the case/coreinterface, leading to the internal rupture of the gear. 1999 ElsevierScience Ltd. All rights reserved.