Hydrodynamic type oil-impregnated sintered bearing

Details Hydrodynamic type oil-impregnated sintered bearing Hydrodynamic type oil-impregnated sintered bearing

2011-08-02

2011-08-02

Joyce, William C (Department: 3656)

Bearings

Rotary bearing

Fluid bearing

C384S118000

Reexamination Certificate

active

07988361

ABSTRACT:
A hydrodynamic type oil-impregnated sintered bearing includes a porous bearing body of sintered metal having a bearing surface opposed to a sliding surface of a rotating shaft, hydrodynamic pressure generating grooves slanting against an axial direction provided in the bearing surface, and lubricating oil or lubricating grease impregnated in pores inside the bearing body, wherein a rate of area of surface holes on the bearing surface is set within a range of 3%-15%, the surface holes being distributed substantially uniformly over the whole area of the bearing surface including areas of the hydronamic pressure generating grooves, wherein the lubricating oil or a base oil of the lubricating grease forms a lubricating film in a bearing clearance, and wherein the lubricating oil or a base oil of the lubricating grease is a lubricating oil selected from among mixtures of poly-α-olefin or hydrogenated compound thereof and a defined phosphoric ester.

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