| 摘要 |
PROBLEM TO BE SOLVED: To inhibit a generation of a noise when a plurality of balls subsequently exceed a step even if the step projecting to a helical space on a connection portion of a circulation groove formed on a cap and a screw groove of a nut. SOLUTION: In this ball screw device, a plurality of balls 43 are accommodated in a row in an approximately one round of a helical space A formed by a male screw (screw shaft) 41 and each screw groove of a nut 42 and a radial through-hole 42a is provided on a nut 42 at a position corresponding to a beginning end and a terminal end of a portion forming an approximately one round of the helical space A of the screw groove of the nut 42. A circulation groove 44a for returning the respective balls 43 from the terminal end to the beginning end are formed on a cap 44 for closing the through-hole 42a. In this case, the cap 44 is movable toward a radial direction of the nut 42 against the nut 42 and is radially elastically supported by a rubber elastic body 45 and a cap 46.
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