| 摘要 |
Disclosed is a cooling fan for motors mainly includes a back cover formed with a through shaft holder and a front cover formed with a plug member and a rotary shaft projected from the plug member. Two bearings or copper bushings are disposed inside the shaft holder to together with an oil ring seal disposed at a front opening of the shaft holder to divide an inner space of the shaft holder into three oil chambers. The front cover is covered over the shaft holder with the plug member received in the front opening thereof and the rotary shaft extending through the oil ring seal and the two bearings and being held thereto by a washer put over a free end of the rotary shaft projected out of the second bearing. Lubricant or the like is filled into the oil chambers in the shaft holder from a back opening of the shaft holder and is stored therein by another oil ring seal disposed in the back opening. Rotational resistance of the rotary shaft, heat produced during such rotation, and power consumed for such rotation all are reduced with the above arrangements.
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