rolling bearing

Abstract

A rolling bearing includes: an outer ring, an inner ring, and rolling elements rolling on the raceways of the outer ring and the inner ring, wherein the surfaces of the inner ring and / or the raceways of the outer ring and / or the rolling elements have a polished layer, and the inner ring and / or the outer ring and / or the rolling elements are made of a steel that has a hardness of at least 58 HRC at least under the polishing layer and has: - at least 0.03 - 0.8% in the edge layer Nitrogen content, where the nitrogen is at least partially dissolved, - at least in the edge layer, a carbon content of 0.1-1.2%, a nickel content of ≤0.4%, a silicon content of 0.2-1.0%, a chromium content of ≥1.0% , ‑≤0.008% sulfur content, ‑≤15ppm oxygen content, ‑≤50ppm titanium content.

Description

technical field [0001] The invention relates to a rolling bearing, which comprises an outer ring, an inner ring and rolling bodies rolling on the raceways of the outer ring and the inner ring. Background technique [0002] Rolling bearings are often subjected to other loads in addition to the Hertzian pressure due to the inherent rolling operation, for example superimposed vibration loads due to vibrations or high temperatures or temperature changes, such vibration loads are caused, for example, by friction or fluctuating ambient temperatures or electric fields, For example, due to the operation of the frequency converter. Typical application examples are transmission bearings in wind turbines or in screw compressors, etc. Compared with the average service life on which the rolling bearings are designed, it is often noted in this case that the bearing failure is significantly earlier, although the Hertzian surface pressure is very clearly below the endurance strength. Thes...

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