| 摘要 |
PROBLEM TO BE SOLVED: To provide a bolt-nut locking structure capable of surely performing locking without increasing the number of components and increasing manufacturing costs.SOLUTION: A bearing surface of a nut 11 and a surface of a washer 12 are respectively provided with a plurality of engagement portions 11A, 12A having inclined planes 11B, 12B for permitting rotation in the screwing direction of a bolt 10, and rotation inhibiting portions 11C, 12C for inhibiting the rotation in the screwing direction of the bolt, in a state of being arranged in the circumferential directions of the nut bearing surface and the washer surface. On the other hand, a locking recessed groove 10C is formed on a bolt shaft portion in a state of being axially extended, a locking projection 12D fitted in the locking recessed groove and locking the washer to the bolt shaft portion, is formed on an inner edge of the bolt shaft portion insertion hole of the washer, a step portion 11D is formed on the whole peripheral edge of a screw hole of the bearing surface of the nut, and a guide projection 12E freely fitted to the nut step portion and guiding the rotation to the washer, of the nut is formed on a peripheral edge of the bolt shaft portion insertion hole of a washer lower face. |
