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http://dx.doi.org/10.9725/kstle.2017.33.1.23

A Study on the Optimum Clearance Selection of Fuel Pump Journal Bearing with Elasto-hydrodynamic Lubrication Analysis  

An, Sung Chan (Engine & Machinery Research Institute, Hyundai Heavy Industries Co., LTD)
Lee, Sang Don (Engine & Machinery Research Institute, Hyundai Heavy Industries Co., LTD)
Son, Jung Ho (Engine & Machinery Research Institute, Hyundai Heavy Industries Co., LTD)
Cho, Yong Joo (School of Mechanical Engineering, Pusan National University)
Publication Information
Tribology and Lubricants / v.33, no.1, 2017 , pp. 23-30 More about this Journal
Abstract
The electric controlled marine diesel engine has fuel pump generating the high pressurized fuel for fuel injection to combustion chamber via a common rail. Fuel pump consists of a cam-roller system. Journal bearing installed between a roller and a cam-roller pin is subjected to fluctuating heavy and instant loads by cam lift. First, Kinematic analysis is carried out to predict bearing loads during one cycle acting on the journal bearing. Second, flexible multi-body dynamic analysis and transient elasto-hydrodynamic(EHD) lubrication analysis for journal bearing considering elastic deformation of cam-roller pin, roller and bearing are conducted using AVL EXCITE/PU software to predict lubrication performance. The clearance ratio and journal groove shape providing lubrication oil are important parameter in bearing design having good performance and can be changed easier than other design parameters such as diameter, width, oil supply pressure and bearing material grade. Generally, journal bearing performance is represented by the minimum oil film thickness(MOFT) and peak oil film pressure(POFP). As well as the traditional design parameters(MOFT, POFP), in this study, temperature rise of lubrication oil is also evaluated through the side leakage flow of supplied oil. By the evaluating MOFT, POFP and temperature rise, the optimum bearing clearance ratio is decided.
Keywords
clearance ratio; EHD(elasto-hydrodynamic); peak oil film pressure (POFP); minimum oil film thickness(MOFT); oil temperature rise;
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