| 摘要 |
The present invention relates to a self-locking bolt-nut assembly. The bolt-nut assembly includes a bolt (100), a nut (200) tightened on the bolt (100), a washer (300) provided between the bolt (100) and the nut (200). The bolt (100) includes a bolt head (110) and a bolt body (120). The bolt body (120) has an external thread thereon. An insertion guide groove (130) is formed in the bolt body along the longitudinal direction. The nut (200) has stop protrusions (210) which are provided on the nut (200) and are arranged in a circumferential direction at regular intervals. The washer (300) includes a rotation-preventive protrusion (310) which protrudes from a circumferential inner edge of the washer (300) towards a center thereof and is inserted into the insertion guide groove (130), and elastic protrusions (320) which are provided on the washer (300) and are arranged in a circumferential direction at regular intervals. Thus, when the nut (200) which has been in contact with the washer (300) is tightened, the elastic protrusions (320) are elastically bent while passing over first surfaces of corresponding stop protrusions (210), and then are returned to original states thereof by elastic force so that elastic protrusions (320) are locked to second surfaces of the stop protrusions (210). |
