| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a ball screw mechanism in which shortage of grease on a male ball rolling groove and a female ball rolling groove is dissolved.SOLUTION: A ball circulation member has: a protrusion part 37 projecting toward a male ball rolling groove 21 in a radial direction, and extending along the male ball rolling groove 21 in a circumferential direction; and guide passages 35, 36 for moving a ball 40 in outside-diameter, axial and inside-diameter directions. A scooping face 37a for scooping the ball 40 and introducing it to the guide passages 35, 36 is formed on one side in the circumferential direction of the protrusion part 37. A through groove 38 opened on the male ball rolling groove 21 in the radial direction and penetrating along the male ball rolling groove 21 in the circumferential direction is formed on the protrusion part 37.</p> |
