| 摘要 |
PROBLEM TO BE SOLVED: To further suppress the vibration of a rotor, when it is rotated at a high speed, and prevent the corrosion of a resin flange part of a stator by lubricating oil shaken off from an oil thrower. SOLUTION: The lubricating oil is fed, in relation to between a rear side bearing 123R and a rear side retainer 122R, between a rear side preload member 128 and the rear side retainer 122R, between a front side bearing 123F and a front side retainer 122F, and between a front side preload member 21 and the front side retainer 122F. The rotor 108 is pressed to an inner side in its thrust direction by a coil spring 129 and a superposed plate spring 22. In addition, the lubricating oil, shaken off by the front side oil thrower 125 to directly intrude into a front side lubricating oil jet nozzle 127F, is made so as to surely collide against its sidewall of a lubricating oil jet nozzle 127F, the diameter of the front side oil thrower 125F, the radius of curvature of its internal wall of a front-side flange 121F, and the diameter and length or the like of the front side lubricating oil jet nozzle 127F are determined. At this point, even a rear side lubricating oil jet nozzle 127R is similarly determined.
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