The lubrication state of the working interface of the filtering reducer turning arm bearing is affected by load,contact geometry,rough surface thermal effect and other factors.It is difficult to figure out the lubrication condition of the working interface with different working condi-tions.In order to study the lubrication performance of the filtering reducer turning arm bearing,the mixed thermal elastohydrodynamic lubrication (TEHL) model was established.Based on the statics and kinematics,the filtering reducer turning arm bearing (ball rolling element-rolling bearing) mechanics was analyzed.Also,the numerical model of TEHL performance of the bearing was established.The discrete convolution fast Fourier transform method was used to solve elastic deformation and surface temperature rise.And the Reynolds equation and energy equation were solved by using the finite difference method.The physical properties,load,velocity, rough surface topography on the bearing lubrication characteristics, and the influence of three-dimensional subsurface stress were investigated.Results indicated that the big radius of roller element of bearing would help to form oil film,and improve the bearing capacity.The average film thickness and temperature has the same change rule with speed and slide-to-roll ratio under different machining surface.When the TEHL of turning arm bearing is gradually getting into the full-film lubrication from mixed lubrication,the max temperature rise will increase at first and then decrease.Decreasing surface roughness would help to improve the lubric-ation condition of turning arm bearing,decrease the max stress of subsurface,and improve surface contact strength.The established mixed TEHL model of the turning arm bearing can simulate the mixed lubrication state,in which,the contact and fluid lubrication exist simultaneously.The mod-el can reflect all kinds of work conditions turning arm bearing lubrication performance.and judge its working efficiency and service life.%由于载荷、接触几何、粗糙表面、热效应等因素的影响,分析不同工作条件下滤波减速器转臂轴承工作界面润滑状态较为困难.为了研究转臂轴承润滑性能,建立转臂轴承的热弹流混合润滑模型.以静力学和运动学建立滤波减速器转臂轴承(球滚动体–滚动轴承)力学模型,结合点接触热弹流混合润滑理论建立轴承热弹流润滑模型,使用离散卷积快速傅里叶变换方法求解弹性变形和表面温升,使用有限差分法求解雷诺方程和能量方程,分析轴承接触副物理尺寸、载荷、卷吸速度和接触副粗糙表面等外部工况对轴承润滑特性以及表面下应力的影响.从数值模拟结果中可以看出:较大滚动体半径有益于轴承润滑油膜形成,提高轴承的承载能力;不同的机械加工表面下接触副平均膜厚和温度随转速和滑滚比变化趋势相同;轴承接触副润滑状态从混合润滑进入全膜润滑状态,油膜内最大温升先减小后增大;提高机械加工表面光洁度有利于提高转臂轴承润滑状态,减小最大表面下应力,提高表面接触强度.本文建立的转臂轴承热弹流混合润滑模型可以模拟接触和流体动压润滑同时存在的混合润滑状态,可以反映转臂轴承在各种工作条件下润滑性能,可以进一步判断其工作效率和使用寿命.
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