Abstract: Either an inner ring or an outer ring is formed to protrude in the direction of the rotation axis more than the other of outer ring or inner ring. For example, the bearing 12 is supported by the bearing housing 11a on the outer peripheral face 12b of the outer ring, and rotatably supports the hub 31a on the inner peripheral face 12a of the inner ring. In this bearing 12, the inner ring is formed to be longer and protrude further than the outer ring in the direction of the rotation axis, and an engagement/support face 12c for enagageably supporting the drive sprocket 92 is formed on the outer periphery of the inner ring formed to protrude as described above. The drive sprocket 92 is able to secure the coaxiality thereof by the engagement with the engagement/support face 12c, and receive the transmittance of rotating torque by engaging with the hub-side spline 31c on the spline 92c.

Abstract: In a stator shaft made by press-fitting a shaft member into a press-fit bore of a flange member, first oil passages having openings in an outer circumferential surface of the shaft member are formed therein, and plural flow passage-forming bores are formed in the flange member so as to extend from outer circumferential surfaces of a flange portion and through the press-fit bore, the shaft member being press-fitted into the press-fit bore so that inner end openings (openings joined to the press-fit bore)of the flow passage-forming bores are opposed to and communicated with the openings of first flow passages, whereby the first and second flow passages are communicated with each other. In this structure, the plural flow passage-forming bores are formed so as to extend in parallel with each other.

Abstract: Either an inner ring or an outer ring is formed to protrude in the direction of the rotation axis more than the other of outer ring or inner ring. For example, the bearing 12 is supported by the bearing housing 11a on the outer peripheral face 12b of the outer ring, and rotatably supports the hub 31a on the inner peripheral face 12a of the inner ring. In this bearing 12, the inner ring is formed to be longer and protrude further than the outer ring in the direction of the rotation axis, and an engagement/support face 12c for enagageably supporting the drive sprocket 92 is formed on the outer periphery of the inner ring formed to protrude as described above. The drive sprocket 92 is able to secure the coaxiality thereof by the engagement with the engagement/support face 12c, and receive the transmittance of rotating torque by engaging with the hub-side spline 31c on the spline 92c.

Abstract: In a stator shaft made by press-fitting a shaft member into a press-fit bore of a flange member, first oil passages having openings in an outer circumferential surface of the shaft member are formed therein, and plural flow passage-forming bores are formed in the flange member so as to extend from outer circumferential surfaces of a flange portion and through the press-fit bore, the shaft member being press-fitted into the press-fit bore so that inner end openings (openings joined to the press-fit bore) of the flow passage-forming bores are opposed to and communicated with the openings of first flow passages, whereby the first and second flow passages are communicated with each other. In this structure, the plural flow passage-forming bores are formed so as to extend in parallel with each other.