Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Washer structure – Including antifriction means
Reexamination Certificate
2002-09-20
2004-09-14
Sandy, Robert J. (Department: 3677)
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Washer structure
Including antifriction means
C411S531000, C384S121000, C384S420000
Reexamination Certificate
active
06789992
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention is related to a washer having oil-bearing portions and more particularly to a washer applied to an end surface of a sleeve bearing, so that the oil-bearing portions may reservoir oil to thereby increase the rotational efficiency of a shaft received in the sleeve bearing.
2. Description of the Related Art
A conventional washer is applied to prevent a fan wheel from contacting with other motor members and a sleeve bearing to thereby reduce abrasion therebetween. Nevertheless, the singular function of the conventional washer is merely capable of preventing the fan wheel from contacting with other motor members. In addition, the conventional washer is rotated by rotation of the fan wheel and thus results in a specific abrasion with an end surface of the oil-pregnant bearing. Consequently, there is a need for a reduction of the abrasion of the bearing.
The inner lubricant of a conventional sleeve bearing may be leaked automatically or forced to leak by a rotating shaft after long-term use. Accordingly, the lubricity of the inside of the bearing is reduced gradually that the bearing results in a relative decrease in the rotational efficiency of a shaft received therein. A specific leakage of the inner lubricant occurs in the ends of the bearing. Consequently, there is a need for an additional member to prevent the bearing from the leakage.
In order to attenuate the lubricant leakage on the end surface of the bearing, the bearing is provided with an oil-circulated manner. To this end, the leakage of the outer lubricant is guided into the inside of the bearing through a guiding groove. However, the leakage of the outer lubricant from the bearing must reservoir on the end surface of the bearing for a while. On the one hand it can avoid the lubricant leakage, and on the other hand it can reduce an abrasion between the washer and the end surface of the bearing. For instance, both of an increase of lubricant layer and a decrease of the total contact area between the washer and the end surface of the bearing is capable of reducing the abrasion.
The present invention intends to provide a washer having oil-bearing portions provided on an inner surface to thereby guide the lubricant leaking from a bearing to form a lubricant layer on the end surface of the bearing in such a way to mitigate and overcome the above problem.
SUMMARY OF THE INVENTION
The primary objective of this invention is to provide a washer having oil-bearing portions which is provided on an inner surface to thereby reduce a total contact area between the inner surface of the washer and an end surface of a bearing for attenuating the abrasion.
The secondary objective of this invention is to provide the washer having oil-bearing portions which guide the lubricant leaking from a bearing to form a lubricant layer on an end surface of the bearing for increasing the lubricity.
The washer in accordance with the present invention mainly comprises an axial hole and a plurality of oil-bearing portions. The oil-bearing portions are located on an inner surface opposite to an outer surface and surround the axial hole.
Other objectives, advantages and novel features of the invention will become more apparent from the following detailed description and the accompanying drawings.
REFERENCES:
patent: 4875787 (1989-10-01), Bauer et al.
patent: 5033937 (1991-07-01), Wilson
patent: 5106342 (1992-04-01), Fisher
patent: 6264566 (2001-07-01), Nieman et al.
patent: 6336868 (2002-01-01), Kurecka et al.
patent: 6592490 (2003-07-01), Olson
U.S. patent application Publication US 2001/0005436 A1, Sjostrom et al., Jun. 2001.*
U.S. patent application Publication US 2003/0016891 A1, Gomyo et al., Jan. 2003.
Hong Ching-Sheng
Hong Yin-Rong
Horng Alex
Bacon & Thomas PLLC
Rodriguez Ruth C.
Sandy Robert J.
Sunonwealth Electric Machine Industry Co. Ltd.
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