A Proposed New Film Thickness–Roughness Ratio, Λz, In Rolling Bearings: Notes on an engineer’s experience with surface texture parameters

Paper #:
  • 2017-01-2415

Published:
  • 2017-10-08
Author(s):
Affiliated:
Abstract:
The film thickness–roughness ratio Λ has been used since the mid-1960s as a criterion for the lubrication conditions in rolling bearings. However, due to an assumed Gaussian distribution of the roughness height amplitudes of the functional surfaces of rolling bearings and other unsubstantiated assumptions concerning the mechanisms of contact interaction, concerns have arisen about the representability of Λ in terms of lubrication. In this study, a more objective Λ-type ratio that does not depend on the law of roughness height distribution and the peculiarities of contact mechanics is introduced and defined as Λz. The relevant range of the new Λ ratio, which identifies a full-film lubrication, is lower than that of its conventional counterpart, and it coincides directionally with contemporary theoretical and experimental results. The study exhibits unique profilometric data of the functional surfaces of the roller bearings, produced by the major bearing manufacturers. Based on the extensive and precision inspection of the surface texture of a representative quantity of these bearings, a substantial deviation of their functional surfaces from normality has been demonstrated.
Access
Now
SAE MOBILUS Subscriber? You may already have access.
Buy
Attention: This item is not yet published. Pre-Order to be notified, via email, when it becomes available.
Select
Price
List
Download
$27.00
Mail
$27.00
Members save up to 40% off list price.
Share
HTML for Linking to Page
Page URL

Related Items

Training / Education
2013-04-09
Article
2016-08-15
Article
2016-08-15
Training / Education
2011-04-09