Analysis on Mixed Lubrication Performance of Pin-bush Pairs in Large-sized Marine Chain
Liu Yi
Liu Xiaoling
Liu Guoliang
Li Qun
Abstract：To investigate the issue of wear in the roller chain of high-power marine equipment engines,an analysis of the motion characteristics of the pin-bush pair was conducted.A model of thermal mixed lubrication of the pin-bush pair was established to study the effects of the equivalent curvature radius,the entrainment ve-locity,the surface roughness,etc.on the mixed lubrication performance of the roller-chain.The results show that when the large-sized roller-chain assembly operates under low-speed and light-load conditions,the pin-bush pair is essentially in a hydrodynamic lubrication state,and thermal effects can be neglected.No significant scale effect is induced by the equivalent curvature radii.In the startup and shutdown phases,the high friction co-efficient between the pin and the bushings,along with the higher contact load,places the contact pair in a mixed lubrication regime,making it susceptible to wear.Higher surface roughness requires a higher entrainment veloci-ty to maintain the contact pair in a hydrodynamic lubrication.As the roughness increases,the friction coefficient also increases,and the film thickness ratio decreases,leading to a worse lubrication state.Due to the low speed,the pin and bush are in a mixed or even boundary lubrication state.Surface hardness has a certain impact on the friction coefficient and maximum oil film temperature rise.In addition,the lubricating status is influenced by the environment viscosity.
Keywords：Roller chainPin-bush pairsMixed lubricationSurface roughnessRatio of hardness to elasticity
Publication Date：2024-12-15
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：8( 100-107 )