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US 10,995,798 B2Granted
Rolling bearing
AssigneeNsk Ltd.
InventorsTsutomu Sato, Fangqi Gong
Life of this patent
Estimating the term…
Abstract
A rolling bearing of the present invention includes an inner ring, an outer ring and a rolling element which are all made of a steel material, and (A) a surface of the rolling element is formed with an Ag coating film, and a raceway of at least one of the inner ring and the outer ring is formed with a Cr coating film or (B) a surface of the rolling element is formed with a Cr coating film, and a raceway of at least one of the inner ring and the outer ring is formed with a Cr coating film.
Claims4
A rolling bearing comprising:
- an inner ring, an outer ring and a rolling element which are all made of a steel material,
- wherein a surface of the rolling element is formed with an Ag coating film as an outermost layer, and
- wherein a raceway of at least one of the inner ring and the outer ring is formed with, as an outermost layer, a coating film which is any one selected from a coating film of Cr alone, a coating film of Cr alloy, a multi-layered coating film containing a layer of Cr alone as the outermost layer, or a multi-layered coating film containing a layer of Cr alloy as the outermost layer,
- wherein an underlayer containing a Ni layer and a Cu layer in this order from a base material is interposed between the Ag coating film and the base material, and
- wherein a film thickness of a total film thickness of the Ag coating film and the underlayer is equal to or smaller than 1.0 μm and equal to or larger than 0.4 μm.
2 more elements
A rolling bearing comprising:
- an inner ring, an outer ring and a rolling element which all made of a steel material,
- wherein a surface of the rolling element is formed with, as an outermost layer, a coating film which is any one selected from a coating film of Cr alone, a coating film of Cr alloy, a multi-layered coating film containing a layer of Cr alone as the outermost layer, or a multi-layered coating film containing a layer of Cr alloy as the outermost layer, and
- wherein a raceway of at least one of the inner ring and the outer ring is formed with an Ag coating film as an outermost layer,
- wherein an underlayer containing a Ni layer and a Cu layer in this order from a base material is interposed between the Ag coating film and the base material, and wherein a film thickness of a total film thickness of the Ag coating film and the underlayer is equal to or smaller than 1.0 μm and equal to or larger than 0.4 μm.
1 more element
Dependencies are inferred from the claim text.