Determination of the Maximum Functional Clearances of a Plain Bearing under Hydrodynamic Lubrication Conditions

The article considers the factors influencing the operation of a sliding bearing. It is shown that on the basis of the basic provisions of the theory of hydrodynamic lubrication, passing from the formula, characterising the bearing capacity of the lubricating layer of sliding bearings, to the parameters of the oil layer thickness and clearance, it is possible to obtain expressions for determining the functional clearances, in the range of which the bearing will operate under conditions of hydrodynamic friction. As a result, of calculations of the plain bearings of the conveyor drive gearbox, the maximum functional clearances had determined for the conditions of using bushings of various lengths in accordance with GOST ISO 4379–2006. The rational length of the plain bearing bush was selected based on the magnitude of the largest functional clearance and its influence on the deviation of the center distance in the gear drive of the gearbox. A new fit H8/f7 has proposed instead of those recommended by the GOST ISO 4379–2006 standard, which has guaranteed to ensure the presence of a hydrodynamic wedge at the beginning of operation and the most rational supply of materials for wear. The practical significance of the research lies in the possibility of using the proposed approach when designing sliding bearings operating under hydrodynamic lubrication conditions in order to determine the rational length and fit of the mating elements of the bearing unit.

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