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Experimental analysis of contact fatigue damage in case hardened gears for off-highway axles.pdf
EFA-03032; No of Pages 17
Engineering Failure Analysis xxx (2017) xxx–xxx
Contents lists available at ScienceDirect
Engineering Failure Analysis
journal homepage: /locate/engfailanal
Experimental analysis of contact fatigue damage in case hardened gears for off-highway axles
A. Terrin a,b, C. Dengo b, G. Meneghetti a,?
a Department of Industrial Engineering, University of Padova, Via Venezia, 1, 35131 Padova, Italy b Engineering and Innovation Department, Carraro S.p.A., Via Olmo 37, 35010 Campodarsego, Padova, Italy
article info
Article history: Received 28 August 2016 Received in revised form 29 December 2016 Accepted 3 January 2017 Available online xxxx
Keywords: Gear contact fatigue Pitting Micropitting Macropitting Shot peening
abstract
Pitting is one of the main causes of failure in planetary gear sets of axles designed for agricultural vehicles. The high torque and the low wheel speed typical of such machines result in poor lubrication and promote the onset of contact fatigue failure by pitting, which generally occurs earlier in the sun gear than in both the planets and the ring of wheel hub planetary drives. In fact, sun gears are subjected to the highest contact pressure and, at the same time, unfavourable rolling-sliding working conditions. In this paper, six case hardened sun gears damaged by pitting during endurance tests were analysed. The aim of the analysis was to highlight the key aspects of the morphology and the evolution of pitting damage on the case hardened sun gears.
? 2017 Elsevier Ltd. All rights reserved.
1. Introduction
Pitting is a fatigue phenomenon that affects the mating surfaces of mechanical elements characterized by non-conformal contact. In components such as cams, bearings and gears for instance, contacts occur between curved surfaces with different curvature radii, thus the load is carried by a very small contact area, resulting in high pressure. The damaging process starts with the formation of cracks caused by the repeated stres
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