Abstract
Machine elements such as rolling element bearings or gears often experience vibrations due to for example geometrical inaccuracies, shock loading, rotating unbalanced masses, and others. These machine elements rely on a very thin lubricant film to protect the metallic surfaces from direct contact and eventual damage. During rapid variation of load the elastohydrodynamic contact is influenced by the so-called squeeze film effect, however, when both entrainment and squeeze are present, the conditions of film formation are more complex. It is expected that the lubricant film thickness is influenced by the amplitude and frequency of the vibrations. At the same time, as it is known that the film thickness is established in the inlet of the contact, it is equally important to evaluate what is the role played by the supply of lubricant to the contact under oscillatory conditions. To date there are not many studies on the effect of the oscillatory motion parameters upon the behaviour of the lubricant film. In this study the focus is on the effect of the frequency of vibrations and the supply of lubricant upon the film thickness.
Highlights
The results showed that vibrations have a beneficial role in the formation of the EHD film
It is thought that the a suction action takes place during the load decrease phase, which helps supply the contact inlet, lowers the degree of starvation and results in larger film thickness
The supply of lubricant to the contact was restricted by placing wipers in front of the ball and disc
Summary
This content has been downloaded from IOPscience. Please scroll down to see the full text. 174 012033 (http://iopscience.iop.org/1757-899X/174/1/012033) View the table of contents for this issue, or go to the journal homepage for more. Download details: IP Address: 46.233.112.155 This content was downloaded on 24/04/2017 at 14:51 Please note that terms and conditions apply. You may be interested in: The behaviour of lubricated EHD contacts subjected to vibrations X Zhang and R P Glovnea Bearing performance limits with grease lubrication P M E Cann and A A Lubrecht The behaviour of greases in elastohydrodynamic contacts P M Cann, B P Williamson, R C Coy et al Use of structured surfaces for friction and wear control on bearing surfaces Ling Wang Finite line roller-to-race contact M Kushwaha and H Rahnejat Space tribology: its role in spacecraft mechanisms E W Roberts Teager Energy Spectrum for Fault Diagnosis of Rolling Element Bearings Zhipeng Feng, Tianjin Wang, Ming J Zuo et al Evaluation of EHD films by electrical capacitance Karolina Jablonka, Romeo Glovnea and Jeroen Bongaerts Research of Two Different Impulsive Faults of Rolling Element Bearing Zhinong Jiang, Chenghong Xing, Kun Feng et al.13th International Conference on Tribology, ROTRIB’16
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