| 摘要 |
PROBLEM TO BE SOLVED: To realize a structure by which sufficient durability can be obtained even when E grease which is inferior in damper performance is used. SOLUTION: When the diameter of each rolling element 12 is determined for Da and the effective gap of the radial direction of a rolling bearing 4a is determined forδin this bearing, -0.5×10<-3> >δ/Da >-4×10<-3> is satisfied. As a result, phases of axially displacement of each rolling element 12, an outer race 9 and an inner race 11 are matched. Vibration generated when the rolling contact surface of each rolling element 12, an outer raceway 8 and an inner raceway 10 collide is lowered. As a result, an early exfoliation becomes difficult to be generated in a fixed raceway whose conditions are strict.
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