| 摘要 |
PROBLEM TO BE SOLVED: To smoothly supply a lubricant to a shaft rolling groove even in a circular lubricating ring mounted in a ball screw device. SOLUTION: This ball screw device includes: a ball screw provided with a spiral shaft rolling groove formed on the outer peripheral surface; and a nut provided with a nut rolling groove formed opposite to the shaft rolling groove on the inner peripheral surface, wherein the shaft rolling groove and the nut rolling groove are engaged with each other through two or more rolling balls. The end part of the nut is provided with a lubricating ring formed of lubricant-contained material and brought into sliding contact with the screw shaft, and a hole is formed in the lubricating ring to incorporate a lubricating ball fitted to the shaft rolling groove in the hole. COPYRIGHT: (C)2005,JPO&NCIPI
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