needle roller bearings

Needle bearing comprising a cage (3), in which a plurality of portions in the circumferential direction, the annular portions (3b) on both sides in the axial direction of the pockets (3a) and pillar portions (3c) to both sides of each of the pockets (3a) are formed in the circumferential direction wherein each of the column portions (3c) to the ring portions (3b) connects and is flattened so that the middle portion (3c1) in the axial direction has a smaller diameter than both-side portions (3c2) in the axial direction; and a plurality of needles (4) in the pockets (3a) of the cage (3) is held, characterized in that the ring portions (3b) protruding portions which protrude like flanges to the side of the inner diameter and that the inner surface (3b1 ) of the protruding portion of the annular portion (3b) θ to the bearing interior in the direction of the outer diameter at the angle is inclined, one of said bag (3a) facing the inner surface of the ring portion (3b) has a pocket wall surface (3a1), the one end face of the needle (4 ) contacts, and wherein ...