| 摘要 |
PROBLEM TO BE SOLVED: To enable a separator sandwiched by balls to smoothly pass through a circumfluent curved passage. SOLUTION: This ball screw is constituted by installing one screw shaft and one nut, and a spiral groove is respectively arranged on an opposed surface of the screw shaft and the nut. The balls and the separators for separating the balls are arranged in large numbers in the spiral groove. An axially extending circumfluent hole is opening in the nut. One end plug is respectively arranged on both ends of the circumfluent hole. A circumfluent passage for continuously connecting the spiral groove and the circumfluent hole, is arranged inside the respective end plugs. A large number of balls and separators are circumfelent in the circumfluent passage. The circumfluent passage includes one circumfluent curved passage and a guide passage of presenting a straight line shape by continuously connecting both ends of the circumfluent curved passage, the spiral groove and the circumfluent hole. The circumfluent curved passage is composed of one inner guide surface and one outer guide surface. COPYRIGHT: (C)2007,JPO&INPIT
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