Rolling bearing
First Claim
1. A rolling bearing comprising:
- an outer ring having an outer raceway formed on the inner surface thereof;
an inner ring having an inner raceway formed on the outer surface thereof;
a plurality of rolling elements rollably provided between said outer ring and said inner ring so as to move one of said outer and inner rings relative to the other; and
a sealing member for sealing the axial opening of the space between the inner surface of said outer ring and the outer surface of said inner ring in which said rolling elements are provided, wherein said sealing member is formed by an elastic member made of a vulcanizable rubber composition obtained by blending a carboxylated acrylonitrile-butadiene rubber with at least carbon black.
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Accused Products
Abstract
The present invention provides a rolling bearing having a prolonged life suitable for wheel, railway vehicle and steel rolling mill comprising a sealing member which exhibits fair sealing properties even under severe conditions. A rolling bearing comprising an outer ring having an outer raceway formed on the inner surface thereof, an inner ring having an inner raceway formed on the outer surface thereof, a plurality of rolling elements rollably provided between the outer ring and the inner ring, and a sealing member for sealing the axial opening of the space between the inner surface of the outer ring and the outer surface of the inner ring in which said rolling elements are provided, characterized in that the sealing member is formed by an elastic member made of a vulcanizable rubber composition obtained by blending a carboxylated acrylonitrile-butadiene rubber with at least carbon black.
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Citations
16 Claims
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1. A rolling bearing comprising:
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an outer ring having an outer raceway formed on the inner surface thereof;
an inner ring having an inner raceway formed on the outer surface thereof;
a plurality of rolling elements rollably provided between said outer ring and said inner ring so as to move one of said outer and inner rings relative to the other; and
a sealing member for sealing the axial opening of the space between the inner surface of said outer ring and the outer surface of said inner ring in which said rolling elements are provided, wherein said sealing member is formed by an elastic member made of a vulcanizable rubber composition obtained by blending a carboxylated acrylonitrile-butadiene rubber with at least carbon black. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
wherein the amount of carbon black to be blended in said rubber composition is in a range from 15 to 80 parts by weight based on 100 parts by weight of said carboxylated acrylonitrile-butadiene rubber. -
3. The rolling bearing as set forth in claim 2,
wherein said rubber composition further comprises: an electrically-conductive carbon black incorporated therein in an amount of from 2 to 40 parts by weight based on 100 parts by weight of said carboxylated acrylonitrile-butadiene rubber.
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4. The rolling bearing as set forth in claim 2,
wherein said rubber composition exhibits an electrical resistance of lower than 105 Ω - ·
cm as calculated in terms of volume resistivity.
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5. The rolling bearing as set forth in claim 4,
wherein said rubber composition further comprises: an electrically-conductive carbon black incorporated therein in an amount of from 2 to 40 parts by weight based on 100 parts by weight of said carboxylated acrylonitrile-butadiene rubber.
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6. The rolling bearing as set forth in claim 1,
wherein said rubber composition exhibits an electrical resistance of lower than 105 Ω - ·
cm as calculated in terms of volume resistivity.
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7. The rolling bearing as set forth in claim 6,
wherein said rubber composition further comprises: an electrically-conductive carbon black incorporated therein in an amount of from 2 to 40 parts by weight based on 100 parts by weight of said carboxylated acrylonitrile-butadiene rubber.
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8. The rolling bearing as set forth in claim 1,
wherein said rubber composition further comprises: an electrically-conductive carbon black incorporated therein in an amount of from 2 to 40 parts by weight based on 100 parts by weight of said carboxylated acrylonitrile-butadiene rubber.
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9. The rolling bearing as set forth in claim 8,
wherein the amount of silicone oil to be incorporated in said rubber composition is within a range from not smaller than 0.2 parts by weight to less than 30 parts by weight based on 100 parts by weight of said carboxylated acrylonitrile-butadiene rubber. -
10. The rolling bearing as set forth in claim 1,
wherein said carboxylated acrylonitrile-butadiene rubber further comprises a silicone oil incorporated therein. -
11. The rolling bearing as set forth in claim 10,
wherein said silicone oil is a homopolymer of straight silicone oil or a polymer of two or more straight silicone oils or a modified silicone oil. -
12. The rolling bearing as set forth in claim 10,
wherein the amount of said silicone oil to be incorporated in said rubber composition is within a range from not smaller than 0.2 parts by weight to less than 30 parts by weight based on 100 parts by weight of said carboxylated acrylonitrile-butadiene rubber. -
13. The rolling bearing as set forth in claim 11,
wherein said silicone oil has a dynamic viscosity of from 20 to 100,000 m2/S at 25° - C.
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14. The rolling bearing as set forth in claim 12,
wherein the amount of said silicone oil to be incorporated in said rubber composition is within a range from not smaller than 0.2 parts by weight to less than 30 parts by weight based on 100 parts by weight of said carboxylated acrylonitrile-butadiene rubber. -
15. The rolling bearing as set forth in claim 10,
wherein said silicone oil has a dynamic viscosity of from 20 to 100,000 mm2/S at 25° - C.
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16. The rolling bearing as set forth in claim 15,
wherein the amount of said silicone oil to be incorporated in said rubber composition is within a range from not smaller than 0.2 parts by weight to less than 30 parts by weight based on 100 parts by weight of said carboxylated acrylonitrile-butadiene rubber.
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Specification