Tapered roller bearing

A tapered roller bearing comprising:

• an outer ring;
• an inner ring disposed radially inwardly of the outer ring;
• a cage between the outer ring and the inner ring;
• and
• a plurality of tapered rollers retained by the cage,
• wherein the inner ring includes:
• a raceway surface on which the tapered rollers are rollable;
• a small flange on a small-diameter side of the raceway surface;
• and
• a large flange on a large-diameter side of the raceway surface,
• wherein the cage includes:
• a large-diameter annular portion;
• a small-diameter annular portion;
• pillars extending axially to couple together the large-diameter annular portion and the small-diameter annular portion;
• and
• pockets in each of which a respective one of the tapered rollers is disposed,
• wherein a space is defined between the outer ring and the inner ring, the space forming an oil flow path through which lubricating oil is to flow from a side of the small flange to a side of the large flange, and
• wherein a radially inner surface of each of the pillars has an oil groove through which the lubricating oil is to flow, the oil groove comprising:
• a first oil groove portion extending along the pillar in an axial direction;
• and
• a second oil groove portion extending obliquely relative to the axial direction from a large-diameter-side end of the first oil groove portion toward the large-diameter annular portion in one of two opposite circumferential directions.