| 摘要 |
PROBLEM TO BE SOLVED: To provide a ball screw device for sufficiently supplying oil into a nut when it is used under oil stirring lubrication. SOLUTION: In this ball screw device comprising a screw shaft 3 having a spiral thread groove 2 on its outer peripheral face, the nut 6 having a thread groove 4 corresponding to the thread groove 2, on its inner peripheral face and engaged with the screw shaft 3, and a number of rolling elements 5 rotatably fitted in a load track formed between both thread grooves 2, 4, and being used in the oil stirring lubrication, the nut 6 is provided with an oil introduction hole 14 communicated with the inside of the nut 6. COPYRIGHT: (C)2004,JPO
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