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Magnetic-floating-bearing-of-a-fan-which-locates-rotary-shaft-by-means-of-distribution-of-magnetic-force

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Magnetic floating bearing of a fan, which locates rotary shaft by means of distribution of magnetic force

Details

Inventors: Chen, Cheng-Kang; Yu, Chien-Chun;
Assignee:
Primary Examiner: Mullins; Burton S.
Assistant Examiner: Mohandesi; Iraj A.
Attorney, Agent or Firm: Rosenberg, Klein & Lee

A magnetic floating bearing of a fan includes an outer magnetic ring formed with a central axial through hole and an upper and a lower ends of the wall of the through hole having a magnetic strength greater than that of a center of the wall. An inner magnetic ring formed with a central axial fitting hole in which a rotary shaft is snugly fitted. The polarity of an outer circumferential wall of the inner magnetic ring is identical to the polarity of the wall of the through hole of the outer magnetic ring and an upper and a lower ends of the outer circumferential wall of the inner magnetic ring having a magnetic strength less than that of a center of the outer circumferential wall. Therefore, the inner magnetic ring is rotatably restricted and located within the outer magnetic ring without upward or downward detaching therefrom.

DETAILED DESCRIPTION It is therefore a primary object of the present invention to provide a magnetic floating bearing of a fan, which locates rotary shaft by means of distribution of magnetic force.
The magnetic floating bearing includes: an outer magnetic ring formed with a central axial through hole, an upper and a lower ends of the wall of the through hole having a magnetic strength greater than that of a center of the wall; and an inner magnetic ring formed with a central axial fitting hole in which a rotary shaft is snugly fitted, the polarity of an outer circumferential wall of the inner magnetic ring being identical to the polarity of the wall of the through hole of the outer magnetic ring, an upper and a lower ends of the outer circumferential wall of the inner magnetic ring having a magnetic strength less than that of a center of the outer circumferential wall.
The upper and lower ends of the wall of the through hole of the outer magnetic ring respectively exert greater magnetic repelling force onto the center of the outer circumferential wall of the inner magnetic ring.
Therefore, the inner magnetic ring is rotatably restricted and located within the outer magnetic ring without upward or downward detaching therefrom.
The present invention can be best understood through the following description and accompanying drawings wherein:

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