| 摘要 |
PURPOSE:To restrain temperature up of an inner ring and to improve durability for high temperature by kaing the radius of curvature of raceway track of the inner ring of a bearing larger than the radius of curvature of raceway track of an outer ring. CONSTITUTION:An outer ring 10 of a bearing is integrated into a housing case 11 made of aluminum, and an inner ring 12 is integrated into a shaft 13 of a rotor. A ball 14 is disposed between the outer rig 10 and the inner ring 12. When radius of curvature of raceway track of the outer ring 10 is Po, radius of curvature of raceway track of the inner ring 12 is Pi, and diameter of the ball 14 is D, the bearing is formed in such a manner as to be D<Po<Pi. Thus, temperature up of the inner ring 12 integrated into the shaft 13 can be restrained. Accordingly, the temperature of the bearing can be lowered to lengthen the grease life and improve durability for high temperature.
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