The influence of stick–slip transitions in mixed-friction predictions of heavily loaded cam–roller contacts

滑脱 润滑 粗糙度(岩土工程) 打滑(空气动力学) 机械 材料科学 摩擦系数 表面光洁度 表面粗糙度 接触面积 复合材料 物理 热力学
作者
Shivam S Alakhramsing,M.B. de Rooij,Mark van Drogen,Dirk J. Schipper
出处
期刊:Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology [SAGE Publishing]
卷期号:233 (5): 676-691 被引量:12
标识
DOI:10.1177/1350650118789515
摘要

A load-sharing-based mixed lubrication model, applicable to cam–roller contacts, is developed. Roller slippage is taken into account by means of a roller friction model. Roughness effects in the dry asperity contact component of the mixed lubrication model are taken into account by measuring the real surface topography. The proportion of normal and tangential load due to asperity interaction is obtained from a dry contact stick–slip solver. Lubrication conditions in a cam–roller follower unit, as part of the fuel injection equipment in a heavy-duty diesel engine, are analyzed. Main findings are that stick–slip transitions (or variable asperity contact friction coefficient) are of crucial importance in regions of the cam where the acting contact forces are very high. The contact forces are directly related to the sliding velocity/roller slippage at the cam–roller contact and thus also to the static friction mechanism of asperity interactions. Assuming a constant asperity contact friction coefficient (or assuming that gross sliding has already occurred) in highly loaded regions may lead to large overestimation in the minimal required cam–roller contact friction coefficient in order to keep the roller rolling. The importance of including stick–slip transitions into the mixed lubrication model for the cam–roller contact is amplified with decreasing cam rotational velocity.
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