本文選題：滑動軸承　切入點：潤滑分析　出處：《安徽工程大學》2012年碩士論文

【摘要】：內燃機作為一種重要的動力裝置,廣泛運用于國防、交通、工農(nóng)業(yè)等各個領域。而作為現(xiàn)代化、高速化、結構更緊湊的內燃機(包括汽油機、柴油機)的重要零部件之一的滑動軸承,已經(jīng)成為了發(fā)動機減少能源消耗、增強運行穩(wěn)定性以及提高輸出功率、效率的制約因素之一。因此對內燃機軸承系統(tǒng)下的滑動軸承潤滑性能的研究顯得尤其重要。 徑向滑動軸承流體動力潤滑分析是滑動軸承設計的基本問題,有關滑動軸承動力潤滑的理論研究已基本成熟。近年來,考慮實際工況(如軸承制造與裝配誤差、軸瓦表面粗糙度、軸瓦變形、軸頸傾斜等)對軸承潤滑性能的研究也日趨完善。上述現(xiàn)有研究的理論依據(jù),基本上都是建立在只考慮軸頸的圓周運動、而不計軸頸軸向運動的二維運動Reynolds方程的基礎之上。然而,在一些特殊情況下,軸頸的軸向運動確實存在。本文發(fā)現(xiàn)李震教授、何芝仙教授、桂長林教授在研究內燃機曲軸軸承系統(tǒng)動力學摩擦學耦合問題時,實際工況下內燃機曲軸主軸承的軸心軌跡是三維的,即曲軸主軸承軸頸同時存在圓周、徑向和軸向的三維運動,在對曲軸主軸承進行潤滑分析時,卻未考慮軸頸的軸向運動,有關軸頸三維運動情況下的滑動軸承潤滑分析也尚未見報道。 本課題研究來源于導師選題,是對軸頸二維運動下滑動軸承潤滑性能問題的延伸,李震教授、何芝仙教授和桂長林教授對軸頸二維運動的Reynolds方程研究已經(jīng)建立了成熟的體系,在前人的研究基礎上,主要運用相類似的方法分析了軸頸三維運動狀態(tài)下滑動軸承的潤滑性能。 首先,本文分析了近些年來滑動軸承潤滑領域的相關內容的研究以及所取得的最新研究進展,闡述了研究滑動軸承潤滑的重要意義。 其次,以現(xiàn)有的軸頸傾斜的軸承模型為基礎,利用有限差分法對滑動軸承潤滑分析的二維Reynolds方程的油膜反力進行求解,再積分求出其他的摩擦學性能參數(shù),運用編程軟件編寫潤滑程序計算得到結果。 第三,提出了軸頸圓周、徑向和軸向三維運動狀態(tài)下滑動軸承潤滑分析的Reynolds方程,在二維Reynolds方程基礎上加上軸向運動項,研究分析了軸頸軸向運動對滑動軸承的摩擦學性能的影響。 第四,以N4105內燃機中曲軸-軸承系統(tǒng)為研究模型,根據(jù)柔性曲軸-軸承系統(tǒng)多體動力學分析ADAMS仿真模型得到的主軸頸軸心運動參數(shù),調用第三章的潤滑程序求出五個主軸頸在軸頸三維運動狀態(tài)下的摩擦學特性,并和軸頸二維運動作比較。 最后,針對本課題所作的主要工作和創(chuàng)新點作出總結,并對以后的進一步研究提出了作者的一些個人看法。
[Abstract]:As an important power device, internal combustion engine is widely used in many fields, such as national defense, transportation, industry and agriculture.As one of the most important parts of modern, high-speed and compact internal combustion engines (including gasoline engines and diesel engines), sliding bearings have become the engine to reduce energy consumption, enhance operational stability and increase output power.One of the constraints to efficiency.Therefore, it is very important to study the lubrication performance of sliding bearings in internal combustion engine bearing system.The hydrodynamic lubrication analysis of radial sliding bearings is a basic problem in the design of journal bearings, and the theoretical research on the dynamic lubrication of journal bearings has been basically mature.In recent years, the study of bearing lubrication performance has been improved by considering the actual working conditions (such as bearing manufacturing and assembly error, bearing surface roughness, bearing deformation, journal tilt, etc.).The theoretical basis of the present research is based on the Reynolds equation of two-dimensional motion which only considers the circular motion of the journal and does not take account of the axial motion of the journal.However, in some special cases, the axial motion of the journal does exist.In this paper, it is found that when Professor Li Zhen, Professor he Zhixian and Professor Kui Changlin are studying the dynamic tribological coupling of crankshaft bearing system of internal combustion engine, the axial center track of crankshaft main bearing of internal combustion engine under actual working condition is three dimensional.That is to say, there are three dimensional motions in the journal of crankshaft main bearing at the same time, which are circumferential, radial and axial, but the axial motion of journal is not taken into account in the lubrication analysis of the main bearing of crankshaft.Lubrication analysis of journal bearing under three-dimensional motion of journal has not been reported.The research is an extension of the lubrication performance of journal bearing under the two dimensional motion of journal. Professor Li Zhen, Professor he Zhixian and Professor Gui Changlin have established a mature system to study the Reynolds equation of the two-dimensional motion of journal.On the basis of previous studies, the lubrication performance of journal bearings under the condition of three-dimensional motion of journal is mainly analyzed by using similar methods.First of all, this paper analyzes the recent researches on the lubrication of sliding bearings and the latest research progress, and expounds the significance of the study on lubrication of sliding bearings.Secondly, based on the existing journal tilting bearing model, the oil film reaction force of the two-dimensional Reynolds equation of journal bearing lubrication analysis is solved by using the finite difference method, and the other tribological performance parameters are obtained by integration.The results are obtained by using the program software to compile the lubrication program.Thirdly, the Reynolds equation for lubrication analysis of journal bearings under the condition of circular, radial and axial motion of journal journal is presented. The axial motion term is added to the two-dimensional Reynolds equation.The influence of axial motion of journal on the tribological performance of sliding bearing is studied.Fourthly, taking the crankshaft-bearing system of N4105 engine as the research model, according to the multi-body dynamics analysis of the flexible crankshaft-bearing system, the motion parameters of the main journal axis are obtained by the ADAMS simulation model.The tribological characteristics of the five spindle necks under the three dimensional motion of the journal are obtained by using the lubrication program in chapter 3, and compared with the two dimensional motion of the journal.Finally, this paper summarizes the main work and innovation of this subject, and puts forward some personal opinions of the author for the further research in the future.
【學位授予單位】：安徽工程大學
【學位級別】：碩士
【學位授予年份】：2012
【分類號】：TH117.2

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