| 摘要 |
PROBLEM TO BE SOLVED: To provide a needle roller bearing capable of reducing contact surface pressure between a longitudinal end portion of a holder and an opposite counterpart member.SOLUTION: A needle roller bearing 1 is a resinous holder 20 which couples a plurality of needle rollers 11 and a pair of circular portions, has a plurality of column portions formed at predetermined intervals in a circumferential direction, and stores the plurality of needle rollers in pockets formed between the adjacent column portions and the pair of circular portions. On at least either one of the pair of circular portions, a plurality of lightened portions 25 penetrating in the same direction as a penetrating direction of the pockets are provided at predetermined intervals in the circumferential direction. The circular portions has a pair of ring parts separated in a length direction of the circular portions by the plurality of lightened portions 25, and a plurality of elastically deforming portions coupling the pair of ring parts and capable of elastically deforming.SELECTED DRAWING: Figure 1 |
