Tapered roller bearing

A tapered roller bearing, comprising:

• an outer ring including an outer ring raceway surface on an inner circumferential surface, an inner ring including an inner ring raceway surface on an outer circumferential surface, a plurality of tapered rollers rotatably provided between the outer ring raceway surface and the inner ring raceway surface, and a holder for holding the plurality of tapered rollers at substantially equal intervals in a circumferential direction, wherein
• the holder includes a large-diameter-side annular part, a small-diameter-side annular part coaxially arranged with the large-diameter-side annular part, a plurality of column parts provided at substantially equal intervals in a circumferential direction and axially connecting the large-diameter-side annular part and the small-diameter-side annular part, and a pocket formed between the column parts adjacent to each other in the circumferential direction to hold the tapered roller to be capable of rolling,
• the holder is made of resin, includes a first gap between the axially inner end surface of the small-diameter-side annular part and the small-diameter-side end surface of the tapered roller, includes a second gap between the axially inner end surface of the large-diameter-side annular part and the large-diameter-side end surface of the tapered roller, and is movable within a predetermined range along the axial direction,
• among surfaces of the large-diameter-side annular part, at least the axially inner end surface is rough,
• the large-diameter-side annular part is provided with an oil retaining part retaining a lubricating oil, and
• when the holder is axially moved toward the small-diameter-side of the tapered roller, the oil retaining part comes into contact with the large-diameter-side end surface of the tapered roller, and when the holder is axially moved toward the large-diameter-side of the tapered roller, the oil retaining part is separated away from the large-diameter-side end surface of the tapered roller
• the oil retaining part includes any one of one groove, a plurality of grooves, and a plurality of holes that has a fine shape configured to retain the lubricating oil by action of capillary force, and
• the oil retaining part supplies the lubricating oil stored therein to the large-diameter-side end surface of the tapered roller by the action of the capillary force with the large-diameter-side end surface.