Research On Thermal Elastohydrodynamic Lubrication Of Starved Helical Gear

As a common transmission component,gear are widely used in various mechanical devices.Ensure that gear are well lubricated to improve gear transmission performance and increase service life.However,the long-term transmission of gear under starved conditions can lead to pitting,gluing,and other failures on the tooth surfaces,which can reduce the transmission efficiency and drive performance.Therefore,it is of great significance and value to study the problem of thermal elastohydrodynamic lubrication of gear transmission under an oil starvation condition.Aimed at the involute helical gear and based on the finite length contact model of starved lubrication,starved lubrication model of helical gear is established.Considering the non-Newtonian characteristic,thermal effect and the lubrication characteristics,acquainting the lubrication characteristics of helical gear under the condition of starved.The foundation of the elastic lubrication of the finite length contact under the starved condition.The starved condition is considered into the finite length contact model,and the finite length contact oil depletion lubrication model is established.The effects of the oil film thickness,slip ratio and rotational speed on the lubrication pressure and film thickness are studied.It provides a theoretical basis for the study of the lubrication under the starved condition of helical gear.Study on starved lubrication characteristics of isothermal conditions of helical gears.According to the geometry and kinematics analysis and meshing characteristics of helical gears,isothermal starved lubrication model of helical gears is established.lubrication pressure and film thickness distribution at different meshing positions under starved condition are discussed.the influence on lubrication film thickness,speed and oil viscosity,Ree-Eyring fluid environment characteristics of shear stress on lubrication characteristics of helical gear are researched.The results show that the oil supply has a significant effect on the pressure and film thickness distribution,and starved lubrication will cause the lubricating effect of the helical gear to deteriorate.study on the starved lubrication characteristics of helical gears with thermal elastohydrodynamic.Considering the thermal effect in meshing process,the starved condition numerical solution of thermal elastohydrodynamic lubrication of helical gears is obtained.The influence of lubrication film thickness,rotational speed,lubrication environmental viscosity and Ree-Eyring fluid characteristic shear stress on lubrication pressure,film thickness and temperature distribution during helical gear meshing process is studied.The variation of friction coefficient and equivalent viscosity is discussed.The results show that the thermal effect will lead to a decrease in the film thickness and viscosity of the lubrications.Considering the gear surface roughness factors,effects of roughness type,amplitude and wavelength on the lubrication results in helical gear meshing process.contact fatigue life prediction model of starved condition of helical gears is established,the discussion influence of starved condition and surface roughness on the gear contact fatigue life,surface stress field distribution.the gear wear experiment was carried out to observe the wear condition and compare the qualitative comparison with the numerical results.The results show that at the rough peak,the temperature of the oil film rises significantly.Both the lack of oil and the roughness cause the fatigue life of the gear to decrease.