Effect of boundary slip on elastohydrodynamic lubrication with arbitrary entrainment angle in elliptical contacts

• Published in: Industrial lubrication and tribology Vol. 75; no. 3; pp. 273 - 281
• Main Authors: Cao, Lei, Cai, Jianlin, Wang, Cheng, Yang, Tianyou, Zhou, Wei, Wang, Liwu
• Format: Journal Article
• Language: English
• Published: Bradford Emerald Publishing Limited 04.04.2023; Emerald Group Publishing Limited
• Subjects: Contact angle; Deformation; Densification; Elastohydrodynamic lubrication; Ellipses; Entrainment; Film thickness; Finite element method; Hydrodynamic pressure; Hypoid gears; Load; Lubricants & lubrication; Lubricating properties; Lubrication; Pressure distribution; Reynolds equation; Silicon wafers; Slip; Velocity; Viscosity; EHL; Slip length; Arbitrary entrainment angle; Elliptical contact; Semisystem approach; Boundary slip
• ISSN: 0036-8792; 1758-5775; 0036-8792
• DOI: 10.1108/ILT-09-2022-0262

Purpose The purpose of this study is to describe and observe the influence of boundary slip associated with an arbitrary entrainment angle on the contact lubrication properties of ellipses. Design/methodology/approach Based on the modified Reynolds equation, the boundary slip of any angle is considered in the elliptic contact, and numerical simulation is carried out. In the above calculation, the progressive mesh densification method is used, which greatly reduces the computation time. Findings The results indicate that the variation of film thickness corresponding to different entrainment angles is distinct from those without considering boundary slip. In addition, boundary slip reduces the central film thickness and minimum film thickness, which makes the hydrodynamic pressure distribution smoother. Originality/value The present study focuses on the specific condition with the arbitrary direction of rolling and sliding velocity found in hypoid gears and worm, and some other components. The influence of boundary slip associated with arbitrary entrainment angle on the lubrication film thickness in elliptical contacts is first revealed, which improves a good understanding of elastohydrodynamic lubrication characteristics.