Isoviscous-EHL mechanism of parallel slide-way with oil groove

摘要

The fact that even parallel slide guideways, which structurally are not believed to form macro hydrodynamic wedges, have a diminishing coefficient of friction, as do journal bearings, and shift towards hydrodynamic lubrication as speed increases is well known. Researchers have tried to explain this property from a variety of angles, and the preceding report discussed experiments that clarified the effect of oil grooves of slide guideways. The results of the study that used a ring-shaped turning slide guideway indicated that even in parallel slide guideways with oil grooves there is a hydrodynamic lubrication mechanism. The present report uses calculation to study the mechanism that causes load-carrying capacity that results from the film pressure at the inlet and elastic deformation of the slide guideway. The results make it clear that because of the isoviscous-EHL mechanism (which is a combination of viscous-drag pressure from the oil groove to the slide guideway, the minute wedge pressure resulting from the microslant of the two guideway ends, and the elastic deformation of the slide guideway) sufficient load-bearing capacity is generated.