ROTOR MEMBER OF ELECTRIC MOTOR USING TAPER SLEEVE, ROTARY SHAFT, ROTOR, ELECTRIC MOTOR, AND MACHINE TOOL

摘要

PROBLEM TO BE SOLVED: To prevent displacement of a rotor member relative to a rotary shaft during high-speed rotation and concurrently reduce a press-fit road of the rotary shaft applied to the rotor member.SOLUTION: A rotor 400 includes: a rotary shaft 200 which rotates around an axis line O; and a rotor member 300 having an inner peripheral surface in which an outer peripheral surface of the rotary shaft 200 fits. The outer peripheral surface of the rotary shaft 200 and the inner peripheral surface of the rotor member 300 respectively have taper surfaces 203, 306, which have diameters changing along the axis line Oin a taper shape and closely contact with each other in a state where the outer peripheral surface of the rotary shaft 200 is press-fitted in the inner peripheral surface of the rotor member 300. At least one of the taper surfaces 203, 306 stores a lubricant before the rotary shaft 200 is press-fitted in the rotor member 300 and has an uneven surface structure which is formed to be worn by the rotary shaft 200 being press-fitted in the rotor member 300, thereby discharging the lubricant.SELECTED DRAWING: Figure 1