【作者】

Sangdon Lee

【摘要】

Marine diesel engine is composed of many interacting components. In this study, technologies to improve tribological performance of components for HiMSEN engine are explained. Cam-roller system is used as a device for driving the valve train in HiMSEN engine. Real contact stress as well as Hertz stress is very important design parameter of cam and roller. Local contact stress concentration often cause scratches or contact fatigue damage such as fitting on surface of roller and cam. In order to obtain even contact stress distribution, logarithmic roller profile was applied. Three factors which determine the profile were optimized using micro contact analysis and RSM(Response Surface Method). Optimized profile induced 10% lower contact pressure than the previous profile. Hydrodynamic journal bearings are widely used in machinery to support a rotating shaft. In case of connecting rod bearing, lubricating oil is supplied through the rotating crank pin and high load by firing pressure acts on connecting rod body. So fluctuating oil pressure and elastic deformation of connected components should be considered to evaluate the lubrication performance of journal bearing. Elasto-hydrodynamic(EHD) lubrication analysis considering oil supply pressure variation in a cycle was carried out. Based on the analysis results, the optimum oil supply hole size and clearance of bearing were determined. Idle gear serves to transmit torque for the driving valvetrain form crankshaft to camshaft and consists of gear, shaft and shrink-fitted journal bearing. Idle gear shaft is assembled on front end block by bolts in the latest HiMSEN engine. To make sure of robust idle gear system, convergence technology that is a coming together of vibration analysis, structural analysis and lubrication analysis is applied. Through the natural frequency analysis design for idle gear shaft and supporting part of the engine block were determined. Stress analysis and fatigue analysis were carried out to design the shape of idle gear shaft having enough fatigue safety factor. Based on the EHD lubrication analysis results, idle gear bush design was optimized.

【会议名称】

第28届CIMAC会议

【会议地点】

芬兰 赫尔辛基

【下载次数】

2

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