Method for improving line contact hydrodynamic lubrication under small slide-roll ratio

Abstract

The invention provides a method for improving a line contact hydrodynamic lubrication under a small slide-roll ratio, comprising the following steps of: setting two solids in reverse contact to be a contact body I and a contact body II respectively, controlling the linear speeds of the surfaces of the contact body I and the contact body II which are actually paired, a slide-roll ratio value and a non-dimensional roll speed; coating an oleophylic coating on the surface of the contact body II; and fully filling lubricant oil in a gap between the contact body I and the contact body II, controlling a load (w) applied to the line contact area of the contact body I and the contact body II so that the generated maximum Hertz contact pressure is not greater than 0.5 GPa, thus forming the designed line contact hydrodynamic lubrication. The method can greatly decrease the friction coefficient of the contact area, thereby effectively decreasing the friction coefficients, the friction energy consumptions, and the friction temperature rises of the line contact hydrodynamic lubrications of roller bearings and the like under a small slide-roll ratio, and effectively improving the qualities and the bearing capacities of the hydrodynamic lubrications.

Description

Technical field [0001] The invention relates to a line contact fluid lubrication method, in particular to a method for improving the low slip-roll ratio of the line contact fluid lubrication. Background technique [0002] The fluid lubrication in roller bearings is a small slip-to-roll ratio down-line contact fluid lubrication. This kind of lubrication is required to have a low friction coefficient but maintain sufficient load-bearing capacity. At the same time, the friction reduction, energy consumption and wear resistance in lubrication, that is, thick enough lubricating oil film, is also a key technical issue in roller bearings, which is of great significance for improving the lubrication quality, working performance and life of roller bearings. . [0003] At present, the technical means to improve the anti-friction and wear resistance of roller bearings and improve their lubrication include: 1. Improve the surface hardness of the ring and roller; 2. Finely grind the racewa...

AI Technical Summary

Problems solved by technology

Although these technical means can often effectively reduce the friction coefficient of roller bearings, reduce the wear of roller bearings, and improve the bearing capacity and life of roller bearings, once the lubricating oil film slips on the surface of the rollers and ring raceways, it will cause Lubrication failure, increased friction coefficient, increased wear and even gluing of the bearing surface, these technical means seem to have little effect

Therefore, the technical problems faced by the low-slip-to-roller ratio off-line contact fluid lubrication of roller bearings are: 1. How to prevent or control the slippage of the lubricating oil film interface, ensure the thickness of the lubricating oil film, and ensure the carrying capacity; 2. How to further reduce the lubricating friction coefficient, reducing the frictional heat and temperature rise of the lubricating oil film; 3, how to reduce the wear of the lubricating surface

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