Retainer
AssigneeNsk Ltd.
InventorsKoji Ueda, Yuji Miyamoto
Life of this patent
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Abstract
The present invention provides a cage in which a nitride layer is formed on the surface by using an iron and steel material with a carbon content of 0.25% by weight or less, fabricating it into a predetermined shape and conducting nitriding, which is more excellent in slidability and wear resistance than conventional one. For this purpose, a nitride layer having a hardness of Hv 650 or more at a thickness of 3 μm or more and 15 μm or less is formed on the surface of a cage.
Claims4
A cage fabricated into a predetermined shape by using an iron and steel material with a carbon content of 0.25% by weight or less and then conducting nitriding to form a nitride layer on the surface in which,
- a nitride layer having a hardness of 650 or more by vickers hardness (Hv) is formed at a thickness of 3 μm or more 15 μm or less.
Dependencies are inferred from the claim text.