LOOSING PREVENTION BOLT ASSEMBLY

摘要

The present invention relates to a self-locking bolt assembly comprising: a bolt having a bolt head and a bolt shaft extending to be perpendicular to the bolt head, having a first thread formed on an outer circumferential surface thereof; a fixing nut having a second thread formed therein to allow the first thread coupled thereto; and a washer disposed between the bolt and a fastening target. A plurality of coupling protrusions each having a sloped surface formed to be sloped and a vertical surface connecting adjacent sloped surfaces are provided on a lower end surface of the bolt head in a circumferential direction. A higher end portion of the sloped surface is formed to be oriented in a loosening direction of the bolt, and a lower end portion of the sloped surface is formed to be oriented in a fastening direction of the bolt. A plurality of arrest protrusions each having an arrest sloped surface formed to be sloped, and a vertical surface connecting adjacent arrest sloped surfaces are provided on an upper surface of the washer. A higher end portion of the arrest sloped surface is formed to be oriented in a loosening direction of the bolt, and a lower end portion of the arrest sloped surface is formed to be oriented in a fastening direction of the bolt. A magnetic member is provided within the washer to maintain a binding state of the washer and the fastening target by a magnetic force. When a rotational force acts in a loosening direction of the bolt, the sloped surface of the bolt is caught by the arrest sloped surface of the washer, thereby preventing rotation.