| 摘要 |
PROBLEM TO BE SOLVED: To provide a piece type ball screw capable of ensuring positioning precision and fixing force of a piece member for a nut and improving reliability inexpensively. SOLUTION: In this piece type ball screw provided with the piece member 5 fitted into a piece window 6 provided in a barrel part of the nut 3 and forming a connection channel 5a using a rolling passage as a peripherally turning path, the piece window 6 is formed to have substantially circular cross section, the piece member 5 is formed to have circular cross section by PEEK by corresponding to the piece window 6, arms 9 are protrudedly provided on its both sides and are engaged with a screw channel 3a of the nut 3, the piece member 5 is positioned on the nut 3, and a tapered projecting part 12 whose diameter becomes larger than that of the piece window 6 and becomes large gradually from an inside diameter side toward an outside diameter side is formed in a barrel part of the piece member 5 and is elastically deformed to press-fit and fix the piece member 5 in the nut 3. COPYRIGHT: (C)2007,JPO&INPIT
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