| 摘要 |
The ball scooping position of a ball is setted downwardly of a reference line and the angle of the ball scooping position with respect to the reference line is setted at an angle of -15°. The end face of the rising portion of a tube is disposed so as to coincide with the reference line. The axis of the rising portion is setted so as to be present outside of a line corresponding to the ball center locus of a raceway. The inner surface of the pickup portion of the tube is connected with the ball scooping position of the ball rolling groove of a nut by a surface which exists outside of the ball rolling groove of the nut.
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