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Studies on the Elastohydrodynamic Lubrication of Involute Helical Gears

Author: LiuDongWei
Tutor: WangYouQiang
School: Qingdao Technological University
Course: Mechanical Design and Theory
Keywords: Involute helical cylindrical gears Elastohydrodynamic lubrication Reverse frustum Multigrid method
CLC: TH117.2
Type: Master's thesis
Year: 2008
Downloads: 70
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Abstract


This paper studies the involute helical tooth cylindrical gear of when to change shells stream lubrication problems , mainly include three parts : 1 , the actual helical gear to the conversion of the calculation model ; 2 , helical gear when you change such as temperature bomb stream lubrication ; 3 , oblique gears of time-varying thermal EHL . The first part of a detailed analysis of the geometric parameters of involute helical cylindrical gears , characteristics , focusing on the nature of the spiral helical gear tooth involute pressure angle corner , derived helical gear either engaged instantaneous geometric parameters into the calculation formula of the geometric parameters of the two reverse round . , It is assumed for the load allocation problems on the the different meshing teeth on the gear to withstand the total load in the total length of the contact line on the average distribution and calculate the teeth on the bearing ratio to be calculated using the FORTRAN program . The second part on the basis of the first part of a pair of helical gear teeth of different meshing instantaneous isothermal EHL problem . Tooth contact line domain and gear meshing line domain of one-to-one relationship between the the instantaneous film pressure and thickness of the time-varying characteristics , and further analysis of the time-varying characteristics of engaging online film pressure and thickness . The results obtained by analyzing the transformation of various transient frustum EHL phenomenon can simulate helical gear of the time-varying lubrication trend , but not directly from the longest line of contact state lubrication \lubrication . The third part of the calculation and analysis of helical gear teeth of different instantaneous thermal EHL problem . Compared with isothermal solution analysis after joining temperature affect the oil film pressure , thickness and film temperature trend . The results show that , due to the thermal effect of the pressure of the oil film inside the film thickness is smaller; second peak pressure is higher , the oil film at the outlet of the degree of necking .

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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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