CONSTANT VELOCITY JOINT

To provide a constant velocity joint comprising a pressure-insertion ring which is favorable in assemblability and sealability.SOLUTION: A constant velocity joint 2 comprises an outer ring 10 having an opening 11 at axial one end side, and a shaft portion 12 at axial the other end side, and the shaft portion 12 is connected to a differential gear DF of a vehicle. The constant velocity joint 2 has a pressure-insertion ring 40 which comes in sliding contact with an oil seal S of the differential gear DF while the ring 40 is press-fitted into the shaft portion 12. The pressure-insertion ring 40 has a carburized/quenched region R2 in which an external peripheral portion 42 coming in slide contact with the oil seal S is carburized/quenched, and also has a non-carburized/quenched region R1 in which an internal peripheral portion 41 press-fitted into the shaft portion 12 is not quenched.SELECTED DRAWING: Figure 1 【課題】組み付け性及びシール性が良好な圧入リングを備えた等速ジョイントを提供すること。【解決手段】等速ジョイント２は、軸方向の一端側に開口部１１を有すると共に軸方向の他端側に軸部１２を有する外輪１０を備え、軸部１２が車両のデファレンシャルＤＦに連結される等速ジョイントである。等速ジョイント２は、軸部１２に圧入された状態で、デファレンシャルＤＦのオイルシールＳに摺接する圧入リング４０を有する。圧入リング４０は、オイルシールＳに摺接する外周部４２に浸炭焼入れ処理が施された浸炭焼入れ領域Ｒ２を有し、且つ、軸部１２に圧入される内周部４１に焼入れ処理が施されない非浸炭焼入れ領域Ｒ１を有する。【選択図】図１