초록 ▼

In a balling bearing 1 of small diameter equipped with an outer race 2 and an inner race 3, and a plurality of rolling elements 4 disposed between the outer race 2 and the inner race 3, at least rolling element 4 is composed of a steel of Cr concentration being 8 wt % or higher, and the surface ther

In a balling bearing 1 of small diameter equipped with an outer race 2 and an inner race 3, and a plurality of rolling elements 4 disposed between the outer race 2 and the inner race 3, at least rolling element 4 is composed of a steel of Cr concentration being 8 wt % or higher, and the surface thereof is formed with a layer of N concentration being a range of 3.ltoreq.N %.ltoreq.0.26.times.Cr %+4.42.

대표청구항 ▼

1. A rolling apparatus, wherein rolling elements are disposed between an outer member and an inner member, and the rolling elements are rollable with respect to a first contact face being a contact face of the outer member to the rolling elements and a second contact face being a contact face of the

1. A rolling apparatus, wherein rolling elements are disposed between an outer member and an inner member, and the rolling elements are rollable with respect to a first contact face being a contact face of the outer member to the rolling elements and a second contact face being a contact face of the inner member to the rolling elements, andwherein at least one of the rolling element is composed of a steel of Cr concentration Cr % being 8 wt % or more, and an accomplished rolling element is provided on the surface thereof with a layer of N concentration N % being 3.ltoreq.N %.ltoreq.0.26.times.Cr %+4.42.