Solid anti-friction devices – materials therefor – lubricant or se – Lubricants or separants for moving solid surfaces and... – Organic -co- compound
Reexamination Certificate
2000-02-23
2001-07-10
McAvoy, Ellen M. (Department: 1764)
Solid anti-friction devices, materials therefor, lubricant or se
Lubricants or separants for moving solid surfaces and...
Organic -co- compound
C508S465000, C508S496000, C508S539000
Reexamination Certificate
active
06258762
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a bearing for electric motor sealed with grease, and more particularly it relates to a bearing for electric motor sealed with grease, having small loss by friction, small noise and long life.
2. Description of the Related Art
Conventionally, various investigations have been made on bearing for electric motor to develop a bearing having small loss by friction, small noise and long life. Recently, in particular, global environmental problem is getting a great deal of attention, and advanced countries are obligated to make an effort to reduce waste of energy as less as possible. Various proposals have been made and improvement has been made on bearings used in every field, but it is the actual circumstances that further improvement is still required.
As one conclusion of energy saving problem, it is the demand of the times to use DC motors having good efficiency in place of AC motors.
In particular, in fan motors of air conditioners for household use, now it is the time to use DC motors having good efficiency in place of AC motors that still has the limit even after a converter is provided to change an output. Various proposals have been made to reduce energy loss and improvement has been made on bearings for electric motor used in every field, but it is the actual circumstances that further improvement is still required.
SUMMARY OF THE INVENTION
The present invention has been made for the purpose of providing a markedly excellent bearing for electric motor having low torque, low noise and long life, as compared with the conventional motor bearing.
As a result of various investigations to develop a bearing having the above-mentioned preferable characteristics, the present inventors have found that a good result is obtained by sealing a bearing for electric motor with a grease composition comprising an alkali metal salt and/or an alkaline earth metal salt of a higher fatty acid having 10 or more carbon atoms or of a higher hydroxyfatty acid having at least one hydroxyl group and 10 or more carbon atoms, a specific carbonate compound, and an ester-based synthetic oil such as a diester-based synthetic oil, triester-based synthetic oil or a tetraester-based synthetic oil, and have completed the present invention based on this finding.
REFERENCES:
patent: 2739127 (1956-03-01), Morway et al.
patent: 4322305 (1982-03-01), Lewis
patent: 5009803 (1991-04-01), Brandolese
patent: 5223161 (1993-06-01), Waynick
patent: 5385682 (1995-01-01), Hutchings et al.
patent: 5387374 (1995-02-01), Westfechtel et al.
patent: 5595965 (1997-01-01), Wiggins
patent: 5668092 (1997-09-01), Denton
patent: 8-034987 (1996-06-01), None
McAvoy Ellen M.
Minebea Co. Ltd.
Oliff & Berridg,e PLC
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