Patent ID: 8427029
Filing Date: 2013-04-23
Classification: H02K

Abstract:
1. A rotor shaft used for a rotor of a dynamo-electric machine, wherein the rotor shaft is configured to be divided into a cylindrical inner shaft and an outer shaft disposed on an outer periphery of the inner shaft, the inner shaft includes a tip end portion that is an end on a side where a rotation load is input to the rotor shaft, a rear end portion having an outer diameter and an inner diameter greater than respective outer diameter and inner diameter of the tip end portion, and a thick portion that connects the tip end portion and the rear end portion with each other and that has the same inner diameter as that of the tip end portion and has the same outer diameter as that of the rear end, the outer shaft includes an inner cylindrical portion having an inserting hole into which the inner shaft is inserted and fitted, a magnetic body-mounting outer cylindrical portion that is disposed on an outer peripheral side portion of the inner cylindrical portion and that mounts a magnetic body to form a magnetic circuit, and a flange that is formed radially outward from an outer periphery of the inner cylindrical portion and that connects the inner cylindrical portion and the magnetic body-mounting outer cylindrical portion with each other, the inner shaft and the outer shaft are fastened and fixed to each other by mutual pressing forces in a state that the outer peripheral surfaces of the thick portion and the rear end portion and an inner peripheral surface of the inserting hole of the inner cylindrical portion are brought into contact with each other, and the flange of the outer shaft is disposed at a position opposed to the thick portion of the inner shaft in a radial direction thereof.