柴油机连杆衬套润滑特性分析-机械设计及理论专业论文 word格式.docx

The lubricating properties Analysis of Connecting rod bushing in Diesel engine
Abstract
The connecting rod small end bearing is also known as connecting rod bushing, which is one of the friction pair of three main diesel engine, working in harsh environment of high dynamic load, the poor lubrication, high speed and high temperature. And the lubrication way of connecting rod bushing is splash lubrication, which belongs to plete lubrication, prone to friction and wear phenomenon, so research on the lubrication characteristics of connecting rod bushing has important theoretical significance and practical value.
A pair of friction posed of connecting rod bushing and piston pin, and cooperation between them is a full-floating and they are separated with a layer of oil film, then the lubricant film flow is laminar flow, so the hydrodynamic lubrication is the rod bushing lubrication theory foundation.
This article first carried out on the connecting rod bushing dynamics analysis, obtaining gas force and inertial force and carrying on the vector synthesis, in order to get the connecting rod bushing load and load angle. Then the Holland method is adopted to solve the three dimensional Reynolds partial differential equation. Reynolds equation is divided into two, rotating items and extruded items with different boundary conditions for solving. According to the equilibrium condition namely dynamic equilibrium between external load and bearing capacity of the rotating film and the squeeze film, the formula of axis orbit is deduced to calculate axis orbit in a working cycle of the diesel engine. The maximum film pressure and the minimum film thickness can be solved when axis orbit has been obtained within a work cycle. MATLAB program piled according to the calculation process, to further draw the axis orbit, the maximum film pressure and minimum film thickness in Fig. Finally the connecting rod bushing lubrication characteristics is analyzed under the different crankshaft
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