| 摘要 |
PROBLEM TO BE SOLVED: To provide a return tube type ball screw equipped with a low-cost tube pressing device capable of locking a fixing screw with simple constitution. SOLUTION: This return tube type ball screw 1 is provided with a screw shaft 2 with a spiral thread groove 4 formed on the outer peripheral surface; a nut 3 fitted to the outer periphery of the screw shaft 2 and formed with a spiral thread groove on the inner peripheral surface; and a plurality of balls accommodated in a rolling passage formed by both facing thread grooves. A plane part 7 is formed on the outer peripheral surface of the nut 3, and a return tube 5 is disposed exposed to the plane part 7. The tube pressing device 6 for fixing the return tube 5 comprises a tube presser plate 10 and the fixing screws 11 for fastening both end parts of the tube presser plate 10 to the plane part 7 of the nut 3. The end part of the tube presser plate 10 is allowed to abut on a head 11a of each fixing screw 11 by plastic deformation. COPYRIGHT: (C)2004,JPO
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