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US 2003/0190104 A1Published application
Ball bearing and lubricating method thereof
AssigneeMinebea Co., Ltd.
InventorsShigenori Hoya, Hideki Matsuoka
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AssigneeMinebea Co., Ltd.
InventorsShigenori Hoya, Hideki Matsuoka
Estimating the term…
The churning type of grease 5 of a viscosity of 15-20 mm2/s and a worked penetration of 200˜230 is disposed at the rolling surface 1a of the race portions and the channeling type of grease 6 of 25˜35 mm2/s and a worked penetration of 240˜270 is disposed at the retainer 4. By constituting as such, at rotation of the ball bearing, by maintaining the lubricant oil film 7 in the bearing the lubrication can be continued, and at non-rotation of the ball bearing the lubricant oil film 7 is protected by the grease 5 to prevent the fretting.
A ball bearing characterized by disposing a grease for protecting lubricated surfaces of race portions and another grease for maintaining lubrication on a retainer portion respectively.
A lubricating method of a ball bearing is characterized in that a grease for protecting a lubricated surface is disposed at race portions, and a grease for maintaining the lubrication is disposed at a retainer portion, and the lubricated surface is formed by the grease for protecting the lubricated surface and by the grease for maintaining the lubrication at rotation of the ball bearing.
A method of lubricating a ball bearing having an inner race, an outer race and a retainer, comprising:
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
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Parts of ball or roller bearings: ball cages
Ball cages: comb-shaped
Retaining the grease in or near the bearing: in recesses or cavities provided in retainers, races or rolling elements
With grease as lubricant: grease properties or compositions, e.g. rheological properties
Term end not estimated
1. Field of the Invention
The present invention relates to a ball bearing and a lubricating method thereof, in particular, the ball bearing which has a resistance against a fretting characteristic when non-rotating and a lubricating property when rotating by disposing greases different in property respectively, and a lubricating method thereof.
2. Related art
FIG. 1 is for explanation of the embodiment of the ball bearing of the present invention, in particular, for showing, the lubricant oil film formed in the bearing.
FIG. 2 is for explanation of the embodiment of the ball bearing of the present invention, in particular, for showing the disposition of the grease in the bearing.
FIG. 3 is for showing the whole of the ball bearing.
One embodiment of a ball bearing and a lubricating method of the present invention will be explained referring to FIGS. 1˜3. First, an outline of the embodiment of the ball bearing of the present invention is explained. The ball bearing of the embodiment of the present invention is provided with, as shown in FIG. 3 an outer race 1 and an inner race 2 as race portions, a ring-shaped retainer portion 4 to support a plurality of balls 3 rotatably, and by making the retainer 4 interposed between the outer race 1 and the inner race 2 and making a plurality of balls 3 held on the retainer 4 rolled on a rolling face 1a of the outer race 1 and a rolling surface 2a of the inner race 2 to displace the outer race 1 and the inner race 2 relatively.
Further, the ball bearing of the embodiment of the present invention is, as shown in FIG. 1, structured to lubricate the inside of the ball bearing in such a manner as a lubricant film 7 as a lubricant surface is, formed on the surfaces of the rolling surfaces 1a, 2a in the ball bearing, the retainer 4 and the balls 3 with the grease 5 applied on the rolling face la of the outer race 1 (hereinafter referred to as “grease A5″)” and the grease 6 applied on the retainer 4 (hereinafter referred to as “grease B6”).
Next, details of the grease A5 and B6 to lubricate the inside of the bearing are explained. As the grease A5, as shown in Table 1, a so-called churning type of grease is used, in which it is stirred by being shared at a basic oil viscosity of 15˜20 mm2/s (40° C.) and a worked penetration of 200˜230. Thereby, the grease A5 prevents the contact surface from fretting at the time of non-rotation of the ball bearing by forming rapidly a lubricant film 7 on the contact surface with the basic oil of low viscosity entered between the balls and the rolling surfaces 1a, 2a and at the time of rotation of the ball bearing the rotation torque is adapted to be reduced since the grease is scattered under a churning action and the stirring resistance of the grease is controlled.