Abstract: A rotating electric machine includes a tube-shaped outer housing and a tube-shaped inner housing that forms a coolant flow channel between the outer housing and the inner housing. The inner housing is fixed with the outer housing by press-fitting or shrink-fitting at one end thereof in its axial direction and fastened with the outer housing at another end by plural bolts. One or more non-contacting sections, in which an inner circumferential surface of the outer housing and an outer circumferential surface of the inner housing are not in contact with each other, are formed at a fixation portion made by the press-fitting or the shrink-fitting between the outer housing and the inner housing along a circumferential direction thereof.

Abstract: A rotor structure for a rotary electric machine in which an inner surface of a hollow rotor core and an outer surface of a shaft inserted into a hole of the rotor core are fitted together by mutual engagement between a projection and a recess to compose a rotor, the rotor structure including: a first retainer brought into contact with one end of the rotor core; and a second retainer brought into contact with a surface of the first retainer opposite to a surface in contact with the rotor core so as to fix the first retainer and the rotor core to the shaft, wherein a coefficient of static friction of a first sliding surface between the first retainer and the second retainer is smaller than any other sliding surface provided in the rotor.

Abstract: A rotor structure for a rotary electric machine in which an inner surface of a hollow rotor core and an outer surface of a shaft inserted into a hole of the rotor core are fitted together by mutual engagement between a projection and a recess to compose a rotor, the rotor structure including: a first retainer brought into contact with one end of the rotor core; and a second retainer brought into contact with a surface of the first retainer opposite to a surface in contact with the rotor core so as to fix the first retainer and the rotor core to the shaft, wherein a coefficient of static friction of a first sliding surface between the first retainer and the second retainer is smaller than any other sliding surface provided in the rotor.