| 摘要 |
To extend a life and to stabilize torque and resonance, provided is a bearing unit, including four rolling bearings adjacently disposed in an axial direction, each of the four rolling bearings including an inner race, an outer race, and rolling elements, a shaft fitted to the inner race of each of the rolling bearings, and a sleeve including a fitting hole into which the outer race of each of the rolling bearings is fitted, in which: the four rolling bearings are alternately disposed in the axial direction so that the inner races or the outer races thereof are brought into contact with each other in the axial direction while being disposed in the axial direction with intervals; the outer races of the rolling bearings at both axial ends, which are brought into contact with the inner races or the outer races of the adjacent rolling bearings, are fixed to the sleeve; and the outer races of the central two rolling bearings, which are disposed in the axial direction with intervals, are disposed so as to form a radial gap between the sleeve and the outer races.
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