Abstract: In a tapered roller bearing, a large-diameter-side annular portion includes large-diameter-side pocket surfaces opposed to large end surfaces of respective tapered rollers; and oil retaining recesses each having an opening spanning an inner peripheral surface of the large-diameter-side annular portion and each of the large-diameter-side pocket surfaces. Each of the oil retaining recesses has an inner surface having a radially inwardly facing surface portion which is an inclined surface that is radially inwardly inclined toward the corresponding tapered roller.

Abstract: A tapered roller bearing has pockets configured to receive tapered rollers in a cage. Each of column portions facing the pockets includes a deburring-press processed surface on a radially inner side of a side surface of the each of the column portions. The deburring-press processed surface includes a straight portion located at a center of the pocket in an axial direction, pocket corner rounded portions located at both ends of the pocket in the axial direction, and relief portions each formed between the straight portion and the pocket corner rounded portion. Each of the relief portions has a relief amount increased gradually from an axial end of the straight portion toward the pocket corner rounded portion, and is smoothly connected to the straight portion.

Abstract: In a tapered roller bearing, a large-diameter-side annular portion includes large-diameter-side pocket surfaces opposed to the large end surfaces of the respective tapered rollers; and oil retaining recesses each having an opening spanning the inner peripheral surface of the large-diameter-side annular portion and each of the large-diameter-side pocket surfaces. Each oil retaining recess has an inner surface having a radially inwardly facing surface portion, the radially inwardly facing portion being an inclined surface radially inwardly inclined toward the corresponding tapered roller.

Abstract: A tapered roller bearing has pockets configured to receive tapered rollers in a cage. Each of column portions facing the pockets includes a deburring-press processed surface on a radially inner side of a side surface of the each of the column portions. The deburring-press processed surface includes a straight portion located at a center of the pocket in an axial direction, pocket corner rounded portions located at both ends of the pocket in the axial direction, and relief portions each formed between the straight portion and the pocket corner rounded portion. Each of the relief portions has a relief amount increased gradually from an axial end of the straight portion toward the pocket corner rounded portion, and is smoothly connected to the straight portion.

Abstract: A cage for a tapered roller bearing includes a large-diameter-side annular portion circumferentially extending along large end surfaces of a plurality of tapered rollers; a small-diameter-side annular portion circumferentially extending along small end surfaces of the tapered rollers; and a plurality of pillars coupling together the large-diameter-side annular portion and the small-diameter-side annular portion. The large-diameter-side annular portion has large-diameter-side pocket surfaces opposed to the large end surfaces of the respective tapered rollers. The large-diameter-side pocket surfaces include oil retaining holes including blind holes, and being configured to receive and retain lubricating oil by capillary action.

Abstract: In the tapered roller bearing, at least any one of an outer ring, an inner ring, and a plurality of tapered rollers includes a nitrogen enriched layer. An oil retaining hole is provided in a larger annular portion of a cage. A value of a ratio R/RBASE is not smaller than 0.75 and not greater than 0.87 where R represents a set radius of curvature of a larger end face of the tapered roller and RBASE represents a distance from a point which is an apex of a cone angle of the tapered roller to a larger flange surface of the inner ring. A ratio Rprocess/R is than not lower 0.5 where Rprocess represents an actual radius of curvature after grinding of the larger end face of the tapered roller and R represents a set radius of curvature.

Abstract: In the tapered roller bearing, at least any one of an outer ring, an inner ring, and a plurality of tapered rollers includes a nitrogen enriched layer. An oil retaining hole is provided in a larger annular portion of a cage. A value of a ratio R/RBASE is not smaller than 0.75 and not greater than 0.87 where R represents a set radius of curvature of a larger end face of the tapered roller and RBASE represents a distance from a point which is an apex of a cone angle of the tapered roller to a larger flange surface of the inner ring. A ratio Rprocess/R is than not lower 0.5 where Rprocess represents an actual radius of curvature after grinding of the larger end face of the tapered roller and R represents a set radius of curvature.

Abstract: A cage for a tapered roller bearing is provided which includes a large-diameter-side annular portion circumferentially extending along the large end surfaces of a plurality of tapered rollers; a small-diameter-side annular portion circumferentially extending along the small end surfaces of the tapered rollers; and a plurality of pillars coupling together the large-diameter-side annular portion and the small-diameter-side annular portion. The large-diameter-side annular portion has large-diameter-side pocket surfaces opposed to the large end surfaces of the respective tapered rollers. The large-diameter-side pocket surfaces include oil retaining holes in the form of blind holes. Lubricating oil is introduced into the oil retaining holes and retained therein by capillary action.

Abstract: Radial passages (22) that penetrate from the inner diameter side to the outer diameter side of a retainer (8) are provided between inner wall surface portions (14) of a pocket (10) facing each other in an axial direction of the retainer and a rolling element (6) so that the radial passages (22) serve as a grease reservoir as well as a grease passage for allowing the grease adhering to the rolling element (6) to move onto an outer ring raceway surface (4a). The radial passages (22) are made up of arc-shaped spaces (18) between the rolling element (6) and the inner wall surface portions (14) of the inner wall surface of a pocket (10) and segment shaped spaces (20) between the rolling element (6) and arcuate recesses (16) at the four corners of the pocket (10).

Abstract: Radial passages (22) that penetrate from the inner diameter side to the outer diameter side of a retainer (8) are provided between inner wall surface portions (14) of a pocket (10) facing each other in an axial direction of the retainer and a rolling element (6) so that the radial passages (22) serve as a grease reservoir as well as a grease passage for allowing the grease adhering to the rolling element (6) to move onto an outer ring raceway surface (4a). The radial passages (22) are made up of arc-shaped spaces (18) between the rolling element (6) and the inner wall surface portions (14) of the inner wall surface of a pocket (10) and segment shaped spaces (20) between the rolling element (6) and arcuate recesses (16) at the four corners of the pocket (10).

Abstract: A rolling bearing device includes inner races, outer races, rolling elements, a retainer, and an inner race spacer. The inner race spacer is formed of an oil reservoir member made of a sintered metal impregnated with lubricating oil, and a spacer cover fitted onto an outer periphery of the oil reservoir member. Through a centrifugal force to be applied to the oil reservoir member at the time of bearing rotation, the lubricating oil is scattered radially outward through a chamfered portion of the oil reservoir member via an oil supply passage, to thereby lubricate the interior of the bearing with oil.

Abstract: Provided is a rolling bearing device comprising inner races (2), outer races (3), rolling elements (4), a retainer (5), and an inner race spacer (6). The inner race spacer (6) is formed of an oil reservoir member (7) made of a sintered metal impregnated with lubricating oil, and a spacer cover (8) fitted onto an outer periphery of the oil reservoir member (7). Through a centrifugal force to be applied to the oil reservoir member (7) at the time of bearing rotation, the lubricating oil is scattered radially outward through a chamfered portion (7d) of the oil reservoir member (7) via an oil supply passage (S), to thereby lubricate the interior of the bearing with oil.