| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a bridge-type ball screw which is easy in the attachment of a fixing part of a dowel even if an outside diameter of a nut is large, and can reduce a cost on the processing of a recess and a groove.SOLUTION: As a fixing part 6 which fixes a dowel 4 to a penetration hole 22 of a nut 2 constituting a ball screw, there is employed a part in which protrusions 62a, 62b, 63a and 63b are not present in a center part 61c. The nut 2 has recesses 23 in which a first engagement part 62 and a second engagement part 63 are arranged, respectively, at positions being both sides with the penetration hole 22 sandwiched therebetween in a prescribed direction which intersects with an axial direction. When attaching the fixing part 6 to the nut 2 by moving the fixing part to a prescribed direction, the protrusions 62a, 62b, 63a and 63b are fit into grooves 42a and 42b which are formed at the recesses 23 of the nut 2.</p> |
