| abstract |
Provided is a cage ( 5, 65, 95 ) for a constant velocity universal joint, which is formed into a ring shape with a substantially uniform thickness, including a plurality of pockets ( 20, 80, 110 ) formed in a circumferential direction of the cage ( 5, 65, 95 ), for receiving torque transmitting balls, respectively, the cage ( 5, 65, 95 ) being formed of carbon steel including 0.41 to 0.51 mass % of C, 0.10 to 0.35 mass % of Si, 0.60 to 0.90 mass % of Mn, 0.005 to 0.030 mass % of P, and 0.002 to 0.035 mass % of S, with the balance being Fe and an element inevitably remaining at the time of steelmaking and refining, the cage ( 5, 65, 95 ) being subjected to carburizing, quenching, and tempering as heat treatment, each of the plurality of pockets ( 20, 80, 110 ) having a side surface ( 23, 83, 113 ) finished after the heat treatment. |