| 摘要 |
PROBLEM TO BE SOLVED: To prevent an increase in the load of a bearing, and to prevent the deterioration of a deflection accuracy of a part that takes out an output, even when a bearing housing in which two ball bearing storing parts have large axial deviation is incorporated, with regard to a motor. SOLUTION: The diameter dimension of the bearing storing part 65 positioned close to the surface 67 of the output side of a rotor 60 is in the range of D+0.001 to D+0.005 mm. The diameter dimension of the bearing storing part 64 is in the range of D+0.006 to D+0.011 mm. The allowance of the diameter dimension of the bearing storing part 64 is in the range of +0.006 to +0.011 mm, and shifts to the side larger than that the range of the allowance +0.001 to +0.005 mm of the bearing storing part 65. The fitting of a ball bearing 72 to the bearing storing part 65 is tight, while the fitting to the part 64 of a ball bearing 71 is loose. This loose fitting prevents the ball bearing 71, 72 from warping, while the tight fitting achieves proper deflection accuracy. |
