A study on wear progress of engine bearing under mixed lubrication condition
Recently, the internal-combustion engines are developing with the customers requirements for high performance, high power, and low viscosity oil for low friction loss. The plain bearing used within engines have been operating under harsh conditions, and as oil film thickness decreases, the frequency of direct contacts on the sliding surfaces between the shaft and bearing are gradually increasing. The lubrication condition which mingles the hydrodynamic lubrication and the direct contact of surface roughness asperities is defined as the mixed lubrication condition. Owing to the running condition of bearings under the mixed lubrication, the bearing wear on the sliding surfaces is accelerated by the direct contacts. The change of the shape of bearing surface due to the wear causes the changes of the clearance in the bearing. This leads the changes of the oil film formation and direct contacts between the shaft and the bearing. In order to predict the bearing performance exactly, it is very important to understand the change of the geometric shape of sliding surfaces caused by the wear. Therefore focusing on the correlation between bearing wear and bearing performance under mixed lubrication condition, it is necessary to establish the theoretical analysis method which could explain their behavior. There are a few papers about the theoretical analysis models of the wear progress of the bearing under mixed lubrication conditions. However, in all analysis models, the circumferential roughness which is typical surface roughness of the engine bearings has not been considered. Therefore, the following were conducted in order to establish the theoretical analysis method of the wear progress of the bearing in this study: The bearing performance analyses were carried out, based on the mixed lubrication theory which incorporates both the elastohydrodynamic lubrication (EHL) theory with consideration of the surface roughness and the contact theory of the roughness asperities. By the generated contact pressures between the roughness asperities, the wear depth in the bearing surface were calculated, and the wear progress of the bearing surface was analyzed theoretically. Theoretical analyses of the wear progress of the bearing were verified by experiments on the testing machine.
Takahiro Sano Takeyuki Nakasone Takeshi Katagiri
Daido Metal Co.,Ltd.,Japan
国际会议
上海
英文
1-12
2013-05-13（万方平台首次上网日期，不代表论文的发表时间）