Rolling bearing and spindle device for machine tools
AssigneeNsk Ltd.
InventorsSaburo Azumi, Yasushi Morita, Naoki Matsuyama, Takaaki Anzai
Life of this patent
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Abstract
A grease-lubricated rolling bearing has an outer ring having an outer ring race in an inner peripheral surface thereof, an inner ring having an inner ring race on an outer peripheral surface thereof, rolling elements rollably provided between the outer ring race and the inner ring race, and a grease supply element for supplying an additional grease in the rolling bearing. The amount of the additional grease to be supplied at a time is predetermined to be from 0.1 to 4% of the volume of space in the bearing.
Claims19
A grease-lubricated rolling bearing comprising:
- an outer ring having an outer ring race in an inner peripheral surface thereof;
- an inner ring having an inner ring race on an outer peripheral surface thereof;
- rolling elements rollably provided between the outer ring race and the inner ring race;
- and
- a grease supply element for supplying an additional grease in the rolling bearing,
- wherein the amount of the additional grease to be supplied at a time is predetermined to be from 0.1 to 4% of the volume of space in the bearing.
A spindle device for a machine tool comprising:
- a rolling bearing for supporting a spindle, the rolling bearing being mounted in a housing, the rolling bearing being grease-lubricated, the rolling bearing comprising:
- an outer ring having an outer ring race in an inner peripheral surface thereof;
- an inner ring having an inner ring race in an outer peripheral surface thereof;
- rolling elements rollably provided between the outer ring race and the inner ring race;
- and
- a grease supplying element for supplying an additional grease in the rolling bearing,
- wherein the amount of the additional grease to be supplied at a time is predetermined to be from 0.1% to 4%.
Dependencies are inferred from the claim text.