Effect of angular speed of cam on oil film variation in the line contact thermal EHL of a cam-tappet pair
Industrial Lubrication and Tribology
ISSN: 0036-8792
Article publication date: 2 January 2020
Issue publication date: 2 January 2020
Abstract
Purpose
The influence of the cam angular speed on the pressure, film thickness and temperature profiles at some selected angular positions together with the oil characteristics are investigated.
Design/methodology/approach
A high-order polynomial cam is used, and thermal elastohydrodynamic lubrication (EHL) calculations are carried out by the multi-grid method and line-line scanning technique.
Findings
It is found that the film thickness decreases with a decrease in angular speed. The depth of the dimple that occurred in the reverse motion is also reduced because of the recession in the “temperature–viscosity wedge” effect.
Originality/value
It is revealed that the reduction in the cam angular speed makes the classical big surface dimple evolve into a small centralized dimple during the opposite sliding motion.
Peer review
The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-08-2019-0327
Keywords
Acknowledgements
This work was supported by Weichai Holding Group through Grant SKLER-201704 and also by the National Natural Science Foundation of China through Grant No. 51875298.
Citation
Tang, H., Wang, J., Sun, N. and Zhu, J. (2020), "Effect of angular speed of cam on oil film variation in the line contact thermal EHL of a cam-tappet pair", Industrial Lubrication and Tribology, Vol. 72 No. 6, pp. 713-722. https://doi.org/10.1108/ILT-08-2019-0327
Publisher
:Emerald Publishing Limited
Copyright © 2020, Emerald Publishing Limited