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On the Pure Squeeze Elastohydrodynamic Lubrication in Elliptical Contacts

Author: SongHuaiWen
Tutor: YangPeiRan
School: Qingdao Technological University
Course: Mechanical Design and Theory
Keywords: Pure squeeze Emergency stop Elliptical contact EHL Step load
CLC: TH117.2
Type: Master's thesis
Year: 2008
Downloads: 54
Quote: 1
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Abstract


This paper studies the pure extrusion conditions under EHL theory. Text consists of three parts, namely the emergency stop procedure elliptical contact EHL numerical analysis, step shock loads elliptical contact pure squeeze EHL analysis the impact loads at different initial film thickness pure squeeze EHL lubrication Analysis. The first part of the study for the emergency stop procedure elliptical contact EHL numerical analysis ignores the changes in the speed of the process of entrainment to steady state EHL solution for the initial conditions of the elliptical contact residues after the emergency stop bomb The flow of lubricant film launched a the pure squeeze dynamic analysis. The numerical calculation contains two lubrication state, steady-state the EHL and a pure squeezed EHL. Found that after the trip lubricant film can only be maintained for a short time, the the higher Hertz contact pressure will extend the residual oil film maintenance time by increasing the viscosity of the lubricant, but can not fundamentally change the trend direction entrainment speed can not change the above-mentioned trends. The second part of the establishment of a full numerical solution of the elliptical contact pure squeeze EHL mathematical model, and the step under impact loading conditions got pure squeeze EHL. Reveal different Hertz contact the pressure p H value so that the peak of the center of pressure is different and occur at different times; different p H value so that the pressure and the film thickness curve differ the larger p H value also makes the pressure of the contact region by the center of the pressure peak becomes a pair of symmetrical peak pressure; load step changes in the number of times such that the contact region extend; different load step amplitude makes contact area to the degree of peripheral expansion, the greater the magnitude of the contact zone extension; pure extrusion pressure and film thickness plot in the short-axis and long-axis direction of the contact ellipse have great different. The third part of the establishment of zero oil film under impact loading pure squeeze EHL model, different lubricants squeeze film characteristics are obtained and compared and Sakamoto test results, the two are in good agreement. Different initial film thickness also the pure squeezed problems shock loads analysis, obtained complete numerical solution. Different lubricants under the same load curve showing the pressure and film thickness are very different due to differences in the pressure coefficient of viscosity and sticky; under the conditions of different initial film thickness h oil , pure squeezed also has a great difference in the pressure of the process and the film thickness graph line.

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CLC: > Industrial Technology > Machinery and Instrument Industry > Mechanics (mechanical design of the basic theory ) > Mechanical friction, wear and lubrication > Lubricating
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