This opening portion is in contact with ball 12 at the minor axis position of cam 7, i.e., at {HEAD ~ the position} of {TAIL ~ the X X axis} in FIG 5, thereby preventing retainer 13 from moving in the direction of outer race 11, as shown in FIGS 6A and 6B 
This opening portion is in contact with ball 12 at the minor axis position of cam 7 , i.e. , at { HEAD ~ the position } of { TAIL ~ the X X axis } in FIG 5 , thereby preventing retainer 13 from moving in the direction of outer race 11 , as shown in FIGS 6A and 6B
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