| 摘要 |
PURPOSE:To eliminate the necessity for accurately processing work at a coupling portion by coupling a rotational shaft to a supporting plate by a plastic deformation, thereby enhancing the reliability of the coupling portion. CONSTITUTION:An annular recess 18a which is formed with many projections is formed circumferentially on the bottom of a coupling portion of the outer periphery of a rotational shaft 18 to a metal supporting plate 19. The peripheral edge side of the engaging hole of the plate 19 which has a rotational shaft engaging hole at the center is pressurized in the state that the annular recess 18a of the shaft 18 inserted into the engaging hole is opposed to the wall surface of the engaging hole, thereby plastically deforming the peripheral edge to swell the wall surface of the engaging hole toward the center so as to be flowed into the recess 18a. Thus, the shaft 18 and the plate 19 are integrally coupled. |
