Abstract
In this article, we describe a method of the roller bearing lubrication regime prediction. It uses a mathematical model of the bearing based on the standard ISO/TS 16281 to obtain the external load distribution over the rolling elements. We consider the effects of press fit and thermal gradient etween bearing rings on the internal clearance. The model is limited to an input of an uni-axial radial load and it neglects the centrifugal forces and gyroscopic moments due to its application for the region of low speeds. The lubrication film thickness is evaluated for the most loaded rolling element by a numerical solution of Reynolds’ equation for the line contact. The assessment of the lubrication regime takes into the account the surface roughness by employing the lubrication coefficient as an output parameter. Presented outcomes of the study, based on the measured geometry of the bearing, show the importance of an appropriate lubricant selection for the application.
Highlights
The importance of the rolling element bearing lubrication is indispensable
The bearing model stands on the cornerstone of the method for the prediction of the modified reference rating life for universally loaded bearings described in vol no. / δu Bearing Lubrication Regimes Analysis element is expressed by the first member of (3)
The decrease of surface roughness during the period leads to a significant improvement of the lubrication parameter, it is especially obvious for the Lubricant B and C at low speeds, where it promotes the transition from the mixed to the Elastohydrodynamic Lubrication (EHL) regime
Summary
The importance of the rolling element bearing lubrication is indispensable. The lubricant minimizes the friction between rolling elements and races and greatly contributes to the heat removal during the course. A guideline for an estimation of the oil viscosity with respect to the bearing size, operating speed and temperature is provided in the standard ISO 281 [1]. The only way to obtain correct values of a load distribution is by solving the load distribution with respect to the radial clearance and stiffness of elements. An example of such method is described in the standard ISO/TS 16281 [7]. A method described in this paper combines the numerical solution of Reynolds equation published by Venner [8] and the bearing load calculation as described in the ISO/TS standard [7]. The method is employed to support the research activities focused on bearing monitoring by providing lubrication states predictions
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