Fluid reaction surfaces (i.e. – impellers) – Having lubricating – sealing – packing or specific bearing...
Reexamination Certificate
1999-04-19
2001-07-03
Ryznic, John E. (Department: 3745)
Fluid reaction surfaces (i.e., impellers)
Having lubricating, sealing, packing or specific bearing...
C415S229000
Reexamination Certificate
active
06254348
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an improved structure of a radiating fan, and especially to a radiating fan, wherein the axle center and the bearing thereof are made of precision ceramic material.
2. Background of the Invention
The prior art radiating fan had an axle center made of stainless material with a largest hardness of HK800. The oil bearing is made of copper so that the radiating fan has a lifetime of about 10000 hours. However, this prior art design is not suitable in the current day. Thus, ball bearings made of stainless steel or bearing steel and having a lifetime of 50000~60000 hours are used, but these bearings emit a large noise. Furthermore, the lifetimes of aforesaid two bearings will decrease rapidly with the increase of temperature. Thus, there is an eager demand for a novel bearing which can improve the defect in the prior art.
SUMMARY OF THE INVENTION
Accordingly, the object of the present invention is to provide an improved structure of a radiating fan providing a bearing and an axle center made of precision ceramic material. They have the advantages of long lifetime, low noise, and without using lubricating oil. Thus it is better than the axle center made of stainless steel and the oil bearing made of copper.
Another object of the present invention is to provide an improved structure of a radiating fan, wherein the contact area between the bearing and the axle center are reduce and therefore the sliding friction is decreased.
The present invention will be better understood and its numerous objects and advantages will become apparent to those skilled in the art by referencing to the following drawings in which:
REFERENCES:
patent: 2729522 (1956-01-01), Bechler
patent: 3022685 (1962-02-01), Armacost
patent: 3023059 (1962-02-01), Kirk
patent: 4541786 (1985-09-01), McLean
patent: 4962734 (1990-10-01), Jorgensen
patent: 4975925 (1990-12-01), Derrickson
patent: 5380112 (1995-01-01), Schicktanz et al.
patent: 5738446 (1998-04-01), Ghosh et al.
Rosenberg , Klein & Lee
Ryznic John E.
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