| 摘要 |
PROBLEM TO BE SOLVED: To mass-produce a single female screw body having two kinds of female screw structures different in lead angles and/or lead directions with high quality.SOLUTION: A female screw body 100 includes a female screw spiral structure 114 formed on an inner peripheral face of a hole portion 106a of a cylindrical member 106, a contact face 110a formed on an axial end face of the cylindrical member 106, and a reverse rotation prevention member 160 disposed and fixed to the contact face 110a, having a projecting portion 168 projecting radially inward to a rotating shaft, and configuring a continuous or discontinuous spiral engagement edge 168a of a lead angle and/or a lead direction different from the lead angle and/or lead direction of the female screw spiral structure 114, at a projecting end of the projecting portion 168. The engagement edge 168a can be elastically deformed radially outward in being engaged with a male screw, to permit relative rotation in one direction of the male screw 10 and the female screw spiral structure 114, and to lock the relative rotation in the other direction.SELECTED DRAWING: Figure 1 |
