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Analysis on the Influences of Surface Wear on the EHL of Involute Spur Grar

Author: BianRong
Tutor: WangYouQiang
School: Qingdao Technological University
Course: Mechanical Design and Theory
Keywords: Surface wear Involute spur gear Non-Newtonian transient thermal EHL Ree-Eyring fluid Dynamic load Multigrid method
CLC: TH132.41
Type: Master's thesis
Year: 2010
Downloads: 91
Quote: 0
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Abstract


Involute straight cylindrical gear line contact with the wear surface of non - Newtonian fluid gets hot EHL mathematical model , and application of the multigrid method to solve the pressure , multigrid integral method to calculate the elastic deformation , column-by-column scan method temperature, and numerical techniques to calculate the non-Newtonian fluid equivalent viscosity , shear stress analysis to obtain the numerical solution of the problem completely . In the EHL theory research areas at the same time consider the thermal effects , the roughness surface wear , dynamic load , the impact of time-varying effects and lubricant rheological properties and other factors . Mainly includes three parts : spur gear wear surface time-varying isothermal EHL ; straight the gear wear surface of the time-varying thermal EHL ; dynamic loading gear wear straight surface heats up EHL . First, based on the relationship between the spur gear geometry and motion transmission , involute straight tooth cylindrical gear line contact temperature change EHL model . Application multigrid , considering the gear meshing point of the radius of curvature changes, the entrainment velocity change , the odd and even teeth caused by load changes as well as the influence of surface wear of a pair of teeth of the gear from biting into the whole process to Nie study , respectively, to get the gear tooth surface with a rough peak and continuous wavy EHL comparative analysis of time-varying roughness wear before and after results . The results show that , compared to the rough surface and not wear , surface wear, the film pressure is reduced after the film thickness to increase the coefficient of friction decreases . Then consider the impact of the oil film temperature rise of the oil film pressure , oil density and viscosity , the energy equation and lubrication basic equations to obtain the complete numerical solution of the spur gear surface wear thermal EHL problem . Further , considering the gear meshing process of dynamic load on the gear EHL lubrication film center of pressure moving loads along the meshing line center of film thickness , minimum film thickness , friction coefficient and the maximum temperature rise to instability fluctuations.

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CLC: > Industrial Technology > Machinery and Instrument Industry > Mechanical parts and gear > The transmission mechanism > Meshing > Gears and gearing
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