Patent ID: 8876614

Claim:
An FRP drive shaft which is formed by joining metal end-joints to each end of an FRP cylinder, wherein each of said metal end-joints comprises: a press-fitting joint having a serrated portion which is press-fitted into said FRP cylinder, and a cylindrical outer collar which is a separate member from said press-fitting joint and is fixed, using bond, onto an outer periphery of said FRP cylinder, wherein said cylindrical outer collar and said press-fitting joint have non-circular engaging portions, respectively, which are directly engaged with each other, without any intervening component therebetween, wherein said FRP cylinder and each of said metal end-joints are connected to form a unitary member and to integrally rotate with each other by a press-fit engaging portion between an inner surface of said FRP cylinder and said serrated portion of said press-fitting joint, by a bonded portion between the outer periphery of said FRP cylinder and an inner surface of said cylindrical outer collar, and by said non-circular engaging portions between said cylindrical outer collar and said press-fitting joint, wherein said serrated portion and said non-circular engaging portions do not axially overlap.