テクスチャ付き焼結含油軸受の潤滑特性解析

抄録

Sintered oil-impregnated bearings are made by impregnating lubricating oil into a porous material made by compacting and heat-sintering metal powder. This porous material has countless pores inside that lead to the outside, and thus has excellent oil retention properties. In addition, this bearing is a hydrodynamic bearing, which means that when the shaft rotates in the bearing and a load is applied, pressure is generated by the circulation of the lubricant. Therefore, porous journal bearings do not need to be constantly lubricated like ordinary plain bearings. In addition, because of their low cost and compact size, they are widely used in products that are difficult to maintain, such as audio equipment and home appliances. On the other hand, surface texturing is the regular formation of microscopic shapes on a metal surface. Surface texturing of the inner surface of the journal bearing is an effective countermeasure against this seizure. The lubrication characteristics of journal bearings made of sintered oil-impregnated metal without a texture have been evaluated, and the lubrication characteristics of sintered oil-impregnated metal with a flat texture have been evaluated. However, the lubrication characteristics of journal-type sintered oil-impregnated bearings with texture have not been clarified by experiment or theory. Therefore, the characteristics of a spherical texture on the bearing surface of a sintered oil-impregnated bearing that supports radial loads are clarified by numerical analysis. The effects of the texture parameters such as permeability and spherical texture hole area on the load capacity and frictional force were evaluated, and the following were found.

1.Spherical texturing of sintered oil-impregnated bearings results in a decrease in load capacity and frictional force compared to the case without texturing.

2.As the transmittance is increased, the effect of texture formation is reduced.