To fit surely a rotary shaft of a motor to its bearing without any looseness of the fastening even when an axial force is applied to it, while facilitating its manufacture.
At the shaft end of a hollow cylindrical rotary shaft 40 of a motor, a sectionally U-shaped flange portion 42 expanded to the radial outside of the shaft 40 over the whole periphery of its outer peripheral surface is formed by a buckling molding, and by the pressure welding of a longitudinal wall 42b of the flange portion 42 to the end surface of the inner ring of a bearing 38, the rotary shaft 40 of the motor is fitted to the bearing 38 in its axial direction. In the flange portion 42, first and second thin-walled portions 48, 49 are provided, and thereby, its buckling accuracy in case of an axial compression is improved to increase its pressure welding force to the bearing 38.
AOKI SUSUMU
ONODERA TSUGIO
