Rolling bearing for use in e.g. rotary screw compressor, has outer ring, inner ring and rolling element, and outer zone containing specific amount of nitrogen, carbon, nickel, silicon, chromium, sulfur, oxygen and titanium composition

摘要

The bearing (1) has an outer ring (3), an inner ring (2) and a ring rolling element (4) arranged on paths (6, 12) and made of steel material. The paths of the inner ring, the outer ring and/or surface (9) of ring rolling element comprise burnishing layers (7, 10, 13). The layers comprise 58 rockwell hardness, and outer zones (8, 11, 14) contain 0.3-0.8 percentage of nitrogen, 0.1-1.2 percentage of carbon, 0.4 percentage of nickel, 0.2-1.0 percentage of silicon, 1.0 percentage of chromium, 0.008 percentage of sulfur, 15 parts per million (ppm) of oxygen contents and 50 ppm of titanium contents.