| 摘要 |
PURPOSE:To prevent a bearing ring from reducing in diameter and from running off outward at end portions by forming a S letter like crack extending in axial direction on a bearing ring, and forming the crack so as to generate a gap in circumferential direction in center part under the condition of contact on both edge portions of the crack in axial direction. CONSTITUTION:A bearing ring 3 is formed with a S letter like crack S extending in axial direction on having a gap G, and is made possible to be reduced in diameter in a range of the gap G. An inscribing circle of a needle roller 1 inscribed to the bearing ring 3 gets small accordingly, thereby rattling with a control wheel is not generated. Again, the gap S is made in a shape of generating a clearance in circumferential direction when the both edge portions are contacted to each other, and is made not to run off outward on both end portions, so precision on the bearing ring 3 is maintained. |
