【作者】

Takahiro Sano

【摘要】

论文已在中国上海举行的第27届CIMAC大会上发表。论文的版权归CIMAC所有。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 roughnessasperities is defined as the mixed lubrication condi-tion. Owing to the running condition of bearings underthe 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 ge-ometric 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 whichincorporates both the elastohydrodynamic lubrication(EHL) theory with consideration of the surface rough-ness 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 thebearing surface was analyzed theoretically. Theoretical analyses of the wear progress of the bearing were verified by experiments on the testing machine.

【会议名称】

第27届CIMAC会议

【会议地点】

上海

【下载次数】

1

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