High speed rolling bearing

Details High speed rolling bearing High speed rolling bearing

2002-06-26

2003-11-25

Howard, Jacqueline V. (Department: 1764)

Solid anti-friction devices, materials therefor, lubricant or se

Solid anti-friction device, article or material therefor

C508S552000

Reexamination Certificate

active

06653261

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a high speed bearing for use in a cleaner, and in particular, to a high speed rolling bearing suited for revolution at not less than 50,000 rpm.
2. Description of the Related Art
With a bearing for a cleaner used at a revolution of less than 50,000 rpm, there have not thus far arisen problems with the torque and life thereof because of the low rpm. However, out of necessity of raising a sucking force of the cleaner in order to enhance the operating efficiency thereof, the revolution speed of the cleaner has since been increased to 50,000 rpm or 60,000 rpm. At the same time, there have since arisen needs to meet demands for a lower torque in order to reduce consumption of electric power from the viewpoint of energy conservation, and further, for a longer life of a bearing product.
In meeting various demands required of a high speed bearing for a cleaner, used in such applications as described, a conventional high speed bearing used for a cleaner has encountered problems such as an increase in rotation torque, and shorter life caused by scattering and leakage of grease due to a centrifugal force acting thereon.
It is therefore an object of the invention to provide a bearing for use in a cleaner, and in particular, a high speed rolling bearing suited for revolution at not less than 50,000 rpm.
That is, the invention has established that a bearing of a long life, having a low rotation torque and only a little leakage of grease, can be manufactured by use of a grease of a specific composition in combination with a retainer of the bearing, made of a material of a specific quality.
SUMMARY OF THE INVENTION
The present invention has been developed by finding out that if a grease containing a synthetic hydrocarbon oil as a base oil thereof, having a kinematic viscosity at 40° C. in a range of 50 to 70 mm
2
/s, and containing 3 to 6 mass % of hydrocarbon molecules containing 28 to 32 carbon atoms is retained by retainers made of a polyamide, the grease is effective for use in a high speed rolling bearing such as a bearing used in a cleaner.


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patent: 2000-337380 (2000-12-01), None

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