Rolling bearing and method for manufacturing rolling bearing
AssigneeJtekt Corporation
InventorKazuhiro Kimura
Life of this patent
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Abstract
A rolling bearing includes an inner ring, an outer ring, and a plurality of balls interposed between the inner ring and the outer ring. The inner ring and the outer ring are made of stainless steel. A raceway surface with which the ball is in rolling-contact in each of the inner ring and the outer ring and is a superfinished surface and a coating layer made of a solid lubricating film is formed on the superfinished surface.
Claims6
A touchdown bearing, comprising:
- an inner ring;
- an outer ring;
- and
- a plurality of rolling elements interposed between the inner ring and the outer ring,
- wherein the inner ring and the outer ring are made of stainless steel,
- wherein a raceway surface with which the rolling element is in rolling-contact is provided in each of the inner ring and the outer ring and is a superfinished surface having a surface roughness Ra of 0.1 or more and 0.8 or less, and a coating layer made of a solid lubricating film is formed on the superfinished surface, and
- wherein a contact surface which is a surface other than the raceway surface and is in contact with another member is a blast surface having a surface roughness Ra of 0.1 or more and 1.0 or less, and a coating layer is formed on the blast surface by a solid lubricant film.
A method for manufacturing a touchdown bearing which comprises an inner ring, an outer ring, and a plurality of rolling elements interposed between the inner ring and the outer ring, the method comprising:
- obtaining an intermediate product to be the inner ring or the outer ring by turning from an annular stainless steel material and processing the intermediate product;
- and
- assembling the inner ring and the outer ring manufactured by processing the intermediate product together with the rolling element,
- wherein said processing the intermediate product comprises:
- polishing a surface of the intermediate product;
- superfinishing a surface which is provided in the polished intermediate product and which is to be a raceway surface with which the rolling element comes into rolling-contact such that a superfinished surface has a surface roughness Ra of 0.1 or more and 0.8 or less;
- performing blasting for the intermediate product with the raceway surface masked such that a blast surface has a surface roughness Ra of 0.1 or more and 1.0 or less;
- and
- forming a coating layer with a solid lubricant film on the superfinished surface.
Dependencies are inferred from the claim text.