Roller bearing i.e. high accuracy roller bearing, for shaft of electrically-supported exhaust-gas turbocharger, has outer ring and/or inner ring comprising recess formed adjacent to balls at surfaces of outer and inner rings

摘要

The bearing has an outer ring (4) comprising a raceway (7) at a surface (6), which is positioned and turned towards an inner ring (5). The inner ring comprises another raceway (9) at another surface (8). Bearing balls (10) are positioned in a bearing space (23) between the outer ring and the inner ring on two raceways. A lubrication solvent is provided for lubricating the balls, and is arranged in a lubrication solvent reservoir (12). The outer ring and/or the inner ring comprises a recess formed adjacent to the balls at the surfaces of the rings. The recess comprises an annular groove (15).