| 摘要 |
A bolt set comprises a bolt (1) and a nut (2). The shank (1-2) of the bolt is sheathed with a fastening sheath (3). The fastening sheath (3) is located between the bolt head (1-1) and the nut (2). A set of unidirectional threads is disposed at each of opposite end surfaces of the fastening sheath (3) and the nut (2) in a radial direction. The two sets of threads engage with each other. The loosening direction of the thread at the end surface of the nut is the same as the rotation direction of tightening the nut (2) relative to the bolt (1). The fastening sheath (3) comprises a sleeve tube (3-1) and a thread base (3-2). The thread base (3-2) is disposed at one end of the sleeve tube (3-1), and the unidirectional thread is disposed at the end surface of one side of the thread base (3-2). A layer of thickened portion (1-4) is disposed on the shank (1-2) near the bolt head (1-1). Several bolt slots (1-3) are axially provided on the thickened portion (1-4). The other end of the sleeve tube (3-1) is disposed with several fastening sheath slots (3-3). The sleeve tube (3-1) and the bolt (1) are locked to the bolt slots (1-3) via the fastening sheath slots (3-3). The bolt set of the present invention, through the cooperation of a fastening sheath and a nut, the joining surfaces of which adopt a threaded installation face, enhances the anti-loosening performance of the nut. |
