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Analysis of Threaded Connections for Differential Gear Pinions

[+] Author Affiliations
D. Croccolo, M. De Agostinis, S. Fini, G. Olmi

University of Bologna, Bologna, Italy

Paper No. IMECE2016-65530, pp. V002T02A072; 8 pages
  • ASME 2016 International Mechanical Engineering Congress and Exposition
  • Volume 2: Advanced Manufacturing
  • Phoenix, Arizona, USA, November 11–17, 2016
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-5052-7
  • Copyright © 2016 by ASME


The present paper deals with the failure analysis of a pinion shaft belonging to a differential gear for offroad machinery applications, namely wheel loaders. The motivations of the study arise from some in-field failures, which resulted in the fracture of the pinion shaft, originated at an external groove located at the end of its threaded portion. The issue has been tackled by means of analytical, numerical and experimental tools. The observed failures have been demonstrated to be due to the in-service loosening of a ring nut, whose function is to preload the tapered rolling bearings, which support the shaft.

Copyright © 2016 by ASME



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