Roller bearing for bearing unit

摘要

A rolling bearing for a bearing unit is applicable to so-called under-race lubrication employing an oil air method or an oil mist method. A lubrication oil is supplied toward rolling elements (10) through oil supply channels (21) from a bottom (18) of an annular groove (14) formed in one end face (13) of an inner ring (5). A V-shaped groove (20) is provided along an edge of a raceway groove (8) of the inner ring (5) circumferentially of the inner ring. Outlet ports (25) of the oil supply channels (21) are provided in a recess defined by one of inclined surfaces of the V-shaped groove (20). A space (S) is defined between the outlet ports (25) and the rolling elements (10). A sufficient amount of air flows through the space (S), whereby the lubrication oil is supplied to the rolling elements (10) and the raceway groove (8).