| 摘要 |
PROBLEM TO BE SOLVED: To prevent the generation of a slip in rotation in the case of a low load, and to sufficiently secure durability in the case of a high load. SOLUTION: A ratioδ/dm between a radial internal clearanceδof a deep groove ball bearing 1 and a pitch circle diameter dm of each ball 7 is set to satisfy the relation that 1.1×10<-4> <=δ/dm<=3.5×10<-4> . With the condition thatδ/dm<=3.5×10<-4> , the generation of the slip of the rotation in the case of a low load can be prevented. With the condition that 1.1×10<-4> <=δ/dm, lowering of the durability in the case of a high load can be prevented.
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