Conical roller bearing

A conical roller bearing comprising:

• an outer ring having ring shape;
• an inner ring, having ring shape, and disposed on an inner circumferential side of the outer ring;
• a cage, disposed between the outer ring and the inner ring, and including a plurality of pockets arranged circumferentially at equal intervals;
• and
• a plurality of conical rollers, disposed individually in the pockets, wherein
• the outer ring includes on an inner circumference thereof an outer-ring-side raceway surface on which the conical rollers roll,
• the inner ring includes an inner-ring-side raceway surface on which the conical rollers roll on an outer circumference thereof, a small-diameter-side end portion which is provided at a small-diameter side across the inner-ring-side raceway surface, and a large-diameter-side end portion which is provided at a large-diameter side across the inner-ring-side raceway surface,
• the cage includes a first annular portion which has a ring shape and is provided in a position corresponding to the small-diameter-side end portion on one side of the pockets in an axial direction of the inner ring, a second annular portion which has a ring shape and is provided in a position corresponding to the large-diameter-side end portion on the other side of the pockets in the axial direction, and pillar portions which are provided individually on circumferential both sides of the pockets,
• the conical rollers are individually brought into engagement with the pockets in a position lying further radially outwards than a rotational center of the conical rollers,
• the inner ring includes an annular groove between the inner-ring-side raceway surface and the small-diameter-side end portion,
• the cage includes an erected portion which extends from the first annular portion towards the annular groove,
• the erected portion includes a first inclined portion which is inclined towards the conical rollers while extending from the first annular portion towards the annular groove, and a second inclined portion which is inclined towards the small-diameter-side end portion while extending from the first inclined portion towards the annular groove, and
• the second inclined portion is configured to be brought into engagement with the annular groove in the axial direction of the inner ring.