Abstract: A tapered roller bearing includes: an inner ring; an outer ring; a plurality of tapered rollers in rolling contact with an inner and an outer ring raceway; and an annular cage that has a plurality of pockets for accommodating the tapered rollers. The cage has a plurality of first lateral faces respectively facing outer peripheral surfaces of the tapered rollers respectively accommodated in the plurality of pockets from a first side in a circumferential direction of the cage and a plurality of second lateral faces respectively facing the outer peripheral surfaces from a second side in the circumferential direction of the cage. The plurality of pockets includes a first pocket with a first angle as an angle formed by the first and second lateral faces, and a second pocket that has a second angle smaller than the first angle as the angle formed by the first and second lateral faces.

Abstract: An inner ring unit includes an inner ring, a plurality of tapered rollers, and a cage having an annular shape. The cage includes a plurality of cage bars. The cage includes a stopper portion that is provided to protrude from an axial intermediate portion of the cage bar in the circumferential direction of the cage and configured to hinder the tapered rollers from falling off toward a radially outer side by bringing an axial intermediate portion on an outer peripheral surface of each tapered roller housed in a pocket into contact with the stopper portion. The axial intermediate portion on the outer peripheral surface of the tapered roller is a portion that is disposed on a one axial side and on the radially outer side of the tapered roller with respect to the center of gravity of the tapered roller.

Abstract: An inner ring unit includes an inner ring, a plurality of tapered rollers, and a cage having an annular shape. The cage includes a plurality of cage bars. The cage includes a stopper portion that is provided to protrude from an axial intermediate portion of the cage bar in the circumferential direction of the cage and configured to hinder the tapered rollers from falling off toward a radially outer side by bringing an axial intermediate portion on an outer peripheral surface of each tapered roller housed in a pocket into contact with the stopper portion. The axial intermediate portion on the outer peripheral surface of the tapered roller is a portion that is disposed on a one axial side and on the radially outer side of the tapered roller with respect to the center of gravity of the tapered roller.

Abstract: A tapered roller bearing includes an inner ring, an outer ring, a plurality of tapered rollers, and an annular cage. The annular cage includes a small-diameter annular portion, a large-diameter annular portion, and a plurality of cage bars that couple the small-diameter annular portion and the large-diameter annular portion together. The cage bar has a first facing surface that faces the outer peripheral surface of the tapered roller that is housed. The first facing surface includes a large-diameter-side facing surface, a small-diameter-side facing surface arranged farther away from the outer peripheral surface of the tapered roller than the large-diameter-side facing surface, and an intermediate facing surface inclined gradually away from the outer peripheral surface of the tapered roller with increasing distance from the large-diameter-side facing surface to the small-diameter-side facing surface.

Abstract: A tapered roller bearing includes an inner ring, an outer ring, a plurality of tapered rollers, and an annular cage. The annular cage includes a small-diameter annular portion, a large-diameter annular portion, and a plurality of cage bars that couple the small-diameter annular portion and the large-diameter annular portion together. The cage bar has a first facing surface that faces the outer peripheral surface of the tapered roller that is housed. The first facing surface includes a large-diameter-side facing surface, a small-diameter-side facing surface arranged farther away from the outer peripheral surface of the tapered roller than the large-diameter-side facing surface, and an intermediate facing surface inclined gradually away from the outer peripheral surface of the tapered roller with increasing distance from the large-diameter-side facing surface to the small-diameter-side facing surface.

Abstract: A rolling bearing includes an inner ring, an outer ring, a plurality of balls, and an annular cage that holds the balls at intervals in a circumferential direction. The cage has an annular portion on a first side in an axial direction, and a plurality of cage bars. Pockets that hold the respective balls are each formed between a pair of the cage bars adjacent to each other in the circumferential direction on a second side in the axial direction with respect to the annular portion. Each of the pockets has a pocket surface shaped along a cylindrical surface centered around a center line that is a virtual line extending in a bearing radial direction. A linear protrusion that is elongate in a direction parallel to the center line is provided at an axially-first-side bottom portion of the pocket surface.

Abstract: A tapered roller bearing includes an inner ring including, on its outer circumferential surface, an inner raceway surface and including, on an end portion on a second axial side, a cone back face rib portion protruding radially outward, an outer ring including, on its inner circumferential surface, an outer raceway surface, a plurality of tapered rollers disposed between the inner ring and the outer ring, and an annular cage that retains the plurality of tapered rollers spaced from each other in a circumferential direction. The cage includes a small-diameter annular portion, a large-diameter annular portion located on the second axial side relative to the tapered rollers and the outer ring, and a plurality of cage bar portions. The large-diameter annular portion has an oil pocket having a first aperture that is open radially inward and a second aperture that is open toward the outer raceway surface.

Abstract: A rolling bearing includes an inner ring, an outer ring, a plurality of balls, and a cage that holds the balls. An annular groove for creep suppression is formed in a fitting surface that is fitted on a housing to which an outer ring is attached. The annular groove has a groove bottom portion and a pair of tapered surface portions extending from opposite sides of the groove bottom portion in an axial direction and defining a groove width that is larger toward the fitting surface. In a section including a bearing center line, each of the tapered surface portions has a linear sectional shape inclined to the fitting surface.

Abstract: A rolling bearing includes a seal device provided at an axial end portion of an annular space formed between an inner ring and an outer ring. The seal device has a seal body portion attached to the outer ring, and a seal lip provided so as to extend from the seal body portion toward the inner ring and configured to contact a seal surface of the inner ring. The seal lip has a lip base portion that extends from the seal body portion toward the inner ring, a lip middle portion that extends from the lip base portion in a different direction, and a lip tip portion that extends from the lip middle portion toward the inner ring in a different direction and that contacts the seal surface.

Abstract: A tapered roller bearing includes an inner ring including, on its outer circumferential surface, an inner raceway surface and including, on an end portion on a second axial side, a cone back face rib portion protruding radially outward, an outer ring including, on its inner circumferential surface, an outer raceway surface, a plurality of tapered rollers disposed between the inner ring and the outer ring, and an annular cage that retains the plurality of tapered rollers spaced from each other in a circumferential direction. The cage includes a small-diameter annular portion, a large-diameter annular portion located on the second axial side relative to the tapered rollers and the outer ring, and a plurality of cage bar portions. The large-diameter annular portion has an oil pocket having a first aperture that is open radially inward and a second aperture that is open toward the outer raceway surface.

Abstract: An inner ring includes: a pair of shoulder outer peripheral surfaces on first and second axial sides of a raceway surface of the inner ring in contact with balls; seal grooves disposed in first and second axial ends of the inner ring and defining labyrinth clearances with lips; and edges disposed on the first and second axial sides. Each of the edges is configured to cause grease flowing along an associated one of the shoulder outer peripheral surfaces to leave the shoulder outer peripheral surface in the direction of an extension thereof. Each of the lips includes a lip oblique surface functioning as a guide surface to guide the grease that has left the edge not to a radially inner region of the bearing but to a radially outer region of the bearing.

Abstract: A rolling bearing includes a cage constructed by coupling a pair of split members that are split into halves in an axial direction of the rolling bearing. At least one of the split members has an engagement portion that protrudes in the axial direction toward the other one of the split members. The other one of the split members has an engagement groove that extends along the axial direction and houses the engagement portion. The engagement groove has an insertion port through which the engagement portion is inserted in the axial direction. The insertion port is formed at an end of the engagement groove that is closer to the one of the split members. At least one circumferential face of the engagement groove includes a first inclined surface that increases a circumferential width of the insertion port toward the one of the split members.

Abstract: An inner ring includes: a pair of shoulder outer peripheral surfaces on first and second axial sides of a raceway surface of the inner ring in contact with balls; seal grooves disposed in first and second axial ends of the inner ring and defining labyrinth clearances with lips; and edges disposed on the first and second axial sides. Each of the edges is configured to cause grease flowing along an associated one of the shoulder outer peripheral surfaces to leave the shoulder outer peripheral surface in the direction of an extension thereof. Each of the lips includes a lip oblique surface functioning as a guide surface to guide the grease that has left the edge not to a radially inner region of the bearing but to a radially outer region of the bearing.

Abstract: An inner ring includes: a pair of shoulder outer peripheral surfaces on first and second axial sides of a raceway surface of the inner ring in contact with balls; seal grooves disposed in first and second axial ends of the inner ring and defining labyrinth clearances with lips; and edges disposed on the first and second axial sides. Each of the edges is configured to cause grease flowing along an associated one of the shoulder outer peripheral surfaces to leave the shoulder outer peripheral surface in the direction of an extension thereof. Each of the lips includes a lip oblique surface functioning as a guide surface to guide the grease that has left the edge not to a radially inner region of the bearing but to a radially outer region of the bearing.

Abstract: An inner ring includes: a pair of shoulder outer peripheral surfaces on first and second axial sides of a raceway surface of the inner ring in contact with balls; seal grooves disposed in first and second axial ends of the inner ring and defining labyrinth clearances with lips; and edges disposed on the first and second axial sides. Each of the edges is configured to cause grease flowing along an associated one of the shoulder outer peripheral surfaces to leave the shoulder outer peripheral surface in the direction of an extension thereof. Each of the lips includes a lip oblique surface functioning as a guide surface to guide the grease that has left the edge not to a radially inner region of the bearing but to a radially outer region of the bearing.

Abstract: A rolling bearing includes a seal device provided at an axial end portion of an annular space formed between an inner ring and an outer ring. The seal device has a seal body portion attached to the outer ring, and a seal lip provided so as to extend from the seal body portion toward the inner ring and configured to contact a seal surface of the inner ring. The seal lip has a lip base portion that extends from the seal body portion toward the inner ring, a lip middle portion that extends from the lip base portion in a different direction, and a lip tip portion that extends from the lip middle portion toward the inner ring in a different direction and that contacts the seal surface.

Abstract: A rolling bearing includes an inner ring, an outer ring, a plurality of balls, and a cage that holds the balls. An annular groove for creep suppression is formed in a fitting surface that is fitted on a housing to which an outer ring is attached. The annular groove has a depth at which a groove bottom portion of the annular groove is precluded from coming into contact with the mating member when a static load rating is imposed on the annular groove in a radial direction.

Abstract: A rolling bearing includes a cage formed by coupling a first and a second division pieces into which the cage is divided in an axial direction. At least the first division piece is provided with a protruding portion extending in an axial direction toward the second division piece and having a locking portion formed at a tip of the protruding portion with the locking portion protruding toward a radially outer side. The second division piece is provided with a locked recessed portion in which the locking portion is locked. On an inner peripheral surface of the first division piece, an avoiding recessed portion is formed which allows avoidance of interference of the inner peripheral surface of the first division piece with an inner ring when the first division piece is tilted toward a radially inner side in order to lock the locking portion in the locked recessed portion.

Abstract: A rolling bearing includes an inner ring, an outer ring, a plurality of balls, and a cage that holds the balls. The inner ring is a rotating ring, and the outer ring is a fixed ring. An annular groove for creep suppression is formed in a fitting surface of the rolling bearing that is fitted on a mating member to which the outer ring is attached. The annular groove has a groove main body portion and inclined groove portions located on opposite sides of the groove main body portion in an axial direction and formed to be shallower than the groove main body portion such that the depth of each of the inclined groove portions increases toward the groove main body portion. The inclined groove portions come into contact with the mating member when the outer ring is elastically deformed by a radial load received from the balls.

Abstract: A rolling bearing includes an inner ring, an outer ring, a plurality of balls, and an annular cage. The cage has an annular portion provided on a first side in an axial direction with respect to the balls and a plurality of cage bars. Pockets that house the balls are each formed between the cage bars adjacent to each other in a circumferential direction. An axially-first-side side surface of the annular portion has a first surface that is inclined toward the first side in the axial direction as the first surface extends outward in a radial direction and a second surface provided outward of the first surface in the radial direction and positioned on the second side in the axial direction with respect to an extended virtual plane of the first surface.