Patent ID: 8591115

Claim:
A rolling bearing device comprising: an outer ring having an outer ring raceway groove formed on an inner peripheral surface of the outer ring and a counter bore portion provided on an outer side of the outer ring raceway groove in an axial direction, the outer ring raceway groove having a circular arc surface formed from a connecting point to an edge portion, the circular arc surface having an angle between 0° and 15°; an inner ring member having an inner ring raceway groove formed on an outer peripheral surface of the inner ring member; and a plurality of rolling elements interposed between the outer ring raceway groove and the inner ring raceway groove so as to freely roll and contact the inner ring raceway groove and the outer ring raceway groove at a predetermined contact angle; and a lubricant reservoir portion configured to store lubricant and is formed at an intermediate portion between the outer ring raceway groove and the counter bore portion, wherein the lubricant reservoir includes: (1) a tapered surface portion having a greater diameter than the counter bore portion, and the tapered surface portion being continuous from the edge portion to a terminal point of a wall surface of the outer ring, and (2) a cylindrical surface portion that is continuous from an end of the tapered surface portion in the axial direction.