Dynamic pressure bearing and rotation machine employing same

Details Dynamic pressure bearing and rotation machine employing same Dynamic pressure bearing and rotation machine employing same

2011-08-30

2011-08-30

Joyce, William C (Department: 3656)

Bearings

Rotary bearing

Fluid bearing

C384S112000, C384S133000

Reexamination Certificate

active

08007176

ABSTRACT:
A magnetic fluid is held by a magnetic field in a stationary state and by a centrifugal force during rotation, leaking and splashing of the magnetic fluid caused by the instability of the pumping of a dynamic pressure bearing are prevented without using a magnetic fluid with a high saturation magnetization value, and the service life of the dynamic pressure bearing is extended. For this purpose, a sleeve3having a protruding tubular section is fitted and fixed to the outer periphery of the shaft1having a thrust plate2formed in an axial vicinity so as to be rotatable relatively to the shaft, an annular cover4is formed outwardly from the thrust plate2in an axial direction, the radially inward end of the annular cover4serves as an opening, at least two clearance sections serve as a reservoir10for reserving the magnetic fluid, and a magnetomotive force member15is provided for concentrating the magnetic flux lines on the radially outer side of the end portion13of the magnetic fluid12.

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