Flow passage structure for shaft-press-fitted flange members

A flow passage structure for shaft-press-fitted flange members, comprising:

• a flange member provided with a press-fit bore opened at at least one axial end thereof,
• a shaft member press-fitted in the press-fit bore, first flow passages formed in the shaft member and having openings in an outer circumferential surface thereof, and
• plural flow passage-forming bores formed so as to extend from an outer circumferential surface of the flange member and through the press-fit bore,
• the shaft member being press-fitted into the press-fit bore so that openings of the flow passage-forming bores at which the flow passage-forming bores communicate with the press-fit bore are opposed to and communicated with the openings of the first flow passages, whereby the first flow passages and flow passage-forming bores are communicated with each other,
• the plural flow passage-forming bores being formed so as to extend in parallel with each other.