| 摘要 |
A cage for use in a roller bearing having a plurality of bar portions arranged circumferentially and a pair of circular portions connecting both axial ends of the plurality of bar portions. A circular portion having a larger or equal diameter, in the pair of the circular portions, is referred to as a circular portion, the other of them is referred to as a second circular portion, and it is designed to provide, for example, such a relation as: 0.8<=(I1/I2)<=1.4, and 0.1<=(I1/I3)<=3.0 in which the moment of inertia of area for the circular portion is I1, the moment of inertia of area for the second circular portion is I2, and the moment of inertia of area for the bar portion 7 is I3. This enables to improve the strength of the cage without lowering the load capacity of the bearing to which the cage is assembled.
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