表面粗糙度对三叉杆滑球式万向联轴器弹流润滑特性的影响

Influences of Surface Roughness on Elastohydrodynamic Lubrication Characteristic of Tripod Sliding Ball Universal Coupling

为了研究表面粗糙度对三叉杆滑球式万向联轴器滑球与滑道之间弹流润滑特性的影响,基于线接触等温弹流润滑数值计算模型,建立考虑表面粗糙度的线接触等温弹流润滑数值计算模型。采用随机表面粗糙度来代替实际的粗糙表面,计算中采用Newton-Raphson方法对方程进行数值求解,改变表面粗糙度的幅度和间距来研究它们对膜厚和压力的影响。结果表明:改变表面粗糙度幅度后,膜厚曲线和压力曲线在中心区域产生波动,随着表面粗糙度的增大,两者波动程度逐渐剧烈,产生的压力波动区域的局部压力较大;表面粗糙度间距缩小一倍后,膜厚曲线和压力曲线在波动区域所产生的波动程度更密,随着表面粗糙度的增大,两者波动程度逐渐剧烈,膜厚和压力最大值略微增大。

To investigate the influence of surface roughness on the elastohydrodynamic lubrication characteristic between the slider and the slideway of tripod slider universal coupling of tripod sliding ball universal coupling.Based on the linear contact isothermal elastohydrodynamic lubrication numerical calculation model,a numerical calculation model of linear contact isothermal elastohydrodynamic lubrication considering surface roughness was established.The random surface roughness is used to replace the actual rough surface.The Newton-Raphson method is used to solve the equation numerically.The amplitude and spacing of surface roughness were changed to research their effects on film thickness and pressure.The results show that after changing the amplitude of surface roughness,the film thickness curve and pressure curve fluctuate in the central region.With the increase of surface roughness,the fluctuation degree of them becomes more and more intense,and the local pressure in the pressure fluctuation region is larger.After the surface roughness spacing is doubled,the fluctuation degree of film thickness curve and pressure curve in the fluctuation region is more dense.With the increase of surface roughness,the fluctuation degree of film thickness curve and pressure curve becomes more intense,and the maximum value of film thickness and pressure increases slightly.