【 Supply auto cooling fan 】 The drawback of the popular science oil bearing

【 Supply auto cooling fan 】 Bearing inside diameter easy to wear and short service life; Cannot be used in portable products; Bearing and axial clearance is small, the motor running activation effect is poorer; Motor transport core shaft and the bearing friction generated by high temperature gas, due to the bearing at both ends of oil ring, washers, cannot be ruled out and form nitrides, easy silting up between the core shaft and the bearing gap, of the motor runs smoothly.

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auto cooling fan fan 细节。 asp吗? Cpid = 123
48 v dc fan wholesale at http:///products- 细节。 asp吗? cpid = 124