Reliability Analysis on Gear Contact Fatigue Strength Considering the Effect of Tolerance

Guowei Li*, Weijian Mi, Kailiang Lu, Weiguo Zhang
Logistics Engineering College, Shanghai Maritime University, Shanghai 201306, P.R. China

© 2014 Li et al

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: ( This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the Logistics Engineering College, Shanghai Maritime University, No.1550 Haigang Road, Shanghai 201306, P.R. China; Tel: 13671675122; E-mail:


Tolerance allocation influences product performance especially for miniature precise assembly device. The purpose of this paper is to explore an approach to optimize manufacturing tolerances by combining the reliability of product performance indicators under actual working condition. The paper describes the principle and ways of tolerance handling in the finite element control equations for the displacement and stress, and then introduces the implementation of Monte-Carlo Finite Element Analysis method. We illustrate this method on a gear-tooth of port-cleaning-equipment gear pump and carry out the reliability analysis on gear contact fatigue strength considering the effect of manufacturing tolerance, and a sensitivity analysis is also performed to identify the key tolerances and improve them in order to attain the expected reliability.

Keywords: Finite element analysis, gear contact fatigue strength, manufacturing tolerance allocation, port-cleaning-equipment, reliability analysis.