| 摘要 |
In the process of manufacturing a ribbon cage, an intermediate assembly (17a) is configured by press-fitting press-fit portions (24, 24) provided at base ends of pestle portions (13b, 13b) of respective rivets (9b, 9b) into respective through-holes (12a, 12a) of one cage element (8a), and the intermediate assembly (17a) is subjected to nitriding treatment. The axial dimension (X) of each of the press-fit portions (24, 24) is set smaller (X<Y) than the axial dimension (Y) of each of the through-holes (12a, 12a). Consequently, in a portion in the axial direction between the inner peripheral surface of each of the through-holes (12a, 12a) and the outer peripheral surface of each of the pestle portions (13b, 13b), portions that are not in close contact with each other are provided, and nitride layers are formed in the respective portions that are not in close contact with each other. |
