To provide a ventilated rotor having an improved cooling-performance.
The ventilated rotor is provided with a plurality of partition walls 52, 54. The walls are curved in the manner that as the walls come nearer to the periphery, they are located forward in the direction of rotation, besides the angle of inclination in the vicinity of the end on the outside periphery side becomes greater than that in the vicinity of the end on the inside periphery side. An angle formed between a straight line connecting the end on the outside periphery and the end on the inside periphery and the radius of the rotor passing through the end on the inside periphery is selected at 35 degrees. Calculation of CFD (computed fluid dynamics) shows that an angle at which the cooling performance attains a maximum value exists in the region where air volume passing through the ventilation holes decreases with the increase in the angle of inclination of the partition walls, and that the cooling performance is greater than that of the rotor in which cooling-air volume becomes maximum and the angle of inclination of the partition wall is negative. Thus, the rotor 10 demonstrates an improved cooling-performance more than the conventional art. The cooling may also be performed by boring communication holes in the long partition walls to let air in the holes in the rear part of the long partition-walls.
MURAKAMI TAKAO
SHINTO MASAHIKO
KONDO HIROYUKI
MATSUNAGA TSUTOMU
