Influence of Surface Roughness on Elastohydrodynamic Lubrication Performances of Ball-type Tripod Universal Joint
To reveal the influence mechanism of surface roughness on the lubrication performance of ball-type tripod universal joint,the Gaussian random rough surface was adopted to represent the actual surface of the friction pair,and an equivalent point-contact elastohydrodynamic lubrication model considering surface roughness was established.The finite difference method and multi-mesh technique were used to solve Reynolds equation to obtain oil film pressure and elastic deformation in the contact area.The finite element model of the subsurface stress was established by ANSYS software,and the influence of surface roughness parameters and surface texture direction on elastohydrodynamic lubrication of the joint was analyzed.The results show that with the increase of root mean square of surface roughness,the fluctuation amplitude of oil film pressure and film thickness in the contact area increases,while the high stress area on the secondary surface gradu-ally moves up the surface and approaches the contact surface.With the increase of wavelength factor,the oil film pressure in the contact area shows obvious texture direction distribution,and the subsurface stress shows significant fluctuations.Com-pared with the transverse surface texture direction,the longitudinal surface texture direction has a greater influence on the lubrication performance of the joint.
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