| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a thrust bearing mechanism provided with quality applicable under a lean lubrication condition and a high load condition, and capable of being manufactured at low cost. <P>SOLUTION: A plurality of first rollers 12 are arranged between an intermediate ring 11 and a first raceway ring 9 fixed on a first member 3 via a first retainer 13. A plurality of second rollers 14 are arranged between the intermediate ring 11 and a second raceway ring 10 fixed on a second member 4 via a second retainer 14. A rolling axis center of the first rollers 12 and a rolling axis center of the second rollers 14 are arranged to cross at right angles. In this thrust bearing mechanism 8 high frequency heat treatment is applied on at least one of the ring bodies of the raceway rings 9, 10 and the intermediate ring 11, and area closed by old austenite grain boundary is 10% or less of whole visual field. <P>COPYRIGHT: (C)2008,JPO&INPIT |
