| 摘要 |
A heavy duty tapered roller bearing assembly is designed for use in such devices as the turntables which mount excavator superstructures on their tracked undercarriages. A raceway has two races having four faces that define an annular cavity, the cross section of which is a quadrilateral with converging opposite faces. Annular tapered bearing rollers have walls of a thickness to be compliant under the loads to which they are subjected in use, and the axes of rotation of alternate rollers are at 90 DEG to one another with each roller having its tapered surface confined between two of the converging opposite faces of the cavity and having an end surface abutting a third face. The rollers have central circumferential arcuate grooves which slidably interfit with one another so that each roller is guided by the rollers which flank it; and the roller walls define lubricant chambers from which lubricant moves outwardly as the rollers rotate to lubricate the outer roller surfaces.
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