| 摘要 |
PROBLEM TO BE SOLVED: To provide a thrust bearing having a long life at low cost by simplifying a manufacturing process and further improving a mechanical property. SOLUTION: A raceway track disc 12 of the thrust bearing is formed by applying heat treatment to a cold-finished hoop the surface roughness of which is Rmax≤2μm which is provided by cold-rolling high carbon steel containing; carbon of 0.9 wt.% to 1.2 wt.%; chrome of 1.2 wt.% to 1.7 wt.%; manganese of 0.1 wt.% to 0.5 wt.% and; silicon of 0.15 wt.% to 0.35 wt.%. Further, it has a flat surface 12b on one side in the thickness direction and an inclined part 12c inclined so that the depth in the thickness direction from an edge of this flat surface 12b gradually increases, and the depth in the thickness direction of the inclined surface 12c is 0.2 mm to 0.3 mm at a measuring position radially separated by 0.3 mm toward the flat surface 12b from a fore end of the inclined part positioned radially separated most from an edge of the flat surface 12b. COPYRIGHT: (C)2008,JPO&INPIT
|
