Single thrust bearing fluid dynamic bearing motor

Details Single thrust bearing fluid dynamic bearing motor Single thrust bearing fluid dynamic bearing motor

2007-10-31

2010-12-28

Bryant, David P (Department: 3726)

Metal working

Method of mechanical manufacture

Process for making bearing or component thereof

C029S898070, C310S090000, C310S090500, C369S269000, C384S100000, C384S107000, C384S112000

Reexamination Certificate

active

07856719

ABSTRACT:
A typical dynamic bearing design comprises a ring shaped or circular thrust plate mounted at or near the end of a shaft, the shaft defining together with a surrounding sleeve a journal bearing by providing grooves on only one of the two surfaces facing the gap between the shaft and sleeve. On the ring shaped thrust plate supported by the shaft, the traditional upward thrust bearing defined between the lower face of the thrust plate and the facing surface of the sleeve is maintained; but no grooves are on the surface of the thrust plate distant from the shaft and a facing counterplate surface. Further, the journal bearing is defined to have an asymmetry so that a bias force pressure along the surface of the shaft toward the thrust plate is established. The combination of the journal groove asymmetry pumping action toward the shoulder or thrust plate, together with the single grooved thrust bearing, is sufficient to establish a constant pressure between the distal surface of the thrust plate and the facing counterplate, as well as between the groove thrust plate and the facing shoulder surface.

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