| Mechanical and Civil Engineering |
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| Analysis of piston-pin lubrication considering the effects of structure deformation and cavitation |
| Lin Ba, Zhen-peng He, Yue-hui Liu, Gui-chang Zhang |
| School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China; Aviation Institute of Automation, Civil Aviation University of China, Tianjin 300300, China; State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China |
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Abstract Running conditions for piston pin boss bearing have become very severe due to the high combustion pressure and piston temperature increase over the past ten years. The aim of this paper was to analyze the friction and lubrication characteristic of piston pin boss bearings and a connecting rod small end bearing. This paper provided a comprehensive analysis of piston pin based on a multi-body dynamic model which considers the oil film cavitation and structure deformation. Effects of different lubrication models, pin structures, and thermal deformation on the lubrication were discussed. The lubrication characteristics and performance parameters including oil film pressure distribution, asperity contact pressure, the minimum oil film thickness, the maximum oil film pressure, and friction power loss were listed. The results showed that the minimum oil film thickness was very different and the maximum oil film pressure was nearly the same. A parabola profile of pin bore can reduce the wear to some extent, and a flare profile intensified wear in some places and caused the wear to be concentrated on a smaller area. Reducing the inner diameters will reduce the wear of the pin boss. However, in a realistic design of the pin, avoiding high inertial force of the piston system and satisfying the demand for reliability of the pin, increasing the inner diameters and reliability is a ‘trade off’ problem. A suitable design of the hollow diameter is very important. The results can provide guidance for the design of the pin boss bearing.
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Received: 14 April 2014
Published: 04 June 2015
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