SHAFT COUPLING FOR VEHICLE

PROBLEM TO BE SOLVED: To provide a seal structure which can hold grease and can prevent the intrusion of dust, in a small space and at high-speed rotation, and to provide a shaft coupling for vehicle.SOLUTION: A shaft coupling for vehicle is a constant velocity universal coupling which comprises: an outer side coupling member; an inner side coupling member; a torque transmission member arranged between the outer side coupling member and the inner side coupling member; and a cage for holding the torque transmission member. A seal structure comprises: an outer diameter side ring part attached to an opening end of the outer side coupling member; an inner diameter side ring part attached to an opening end of the inner side coupling member opposing the inner diameter side of the opening end of the outer side coupling member; and a connecting part which connects the outer diameter side ring part and the inner diameter side ring part. The outer diameter side ring part and the inner diameter side ring part are arranged in an overlapping position in a coupling axis direction. 【課題】小スペース・高速回転で、グリースの保持や埃塵の侵入を防止できるシール構造体および車両用軸継手を提供する。【解決手段】車両用軸継手は、外側継手部材と、内側継手部材と、外側継手部材と内側継手部材との間に配設されるトルク伝達部材と、トルク伝達部材を保持するケージとを備えた等速自在継手である。シール構造体は、外側継手部材の開口端部に装着される外径側リング部と、外側継手部材の開口端部の内径側に対向する内側継手部材の開口端部に装着される内径側リング部と、外径側リング部と内径側リング部とを連結する連結部とを備える。外径側リング部と内径側リング部とが、継手軸方向で重畳した位置に配設される。【選択図】図１