Self-locking bolt

Abstract

The invention belongs to the technical field of fastening pieces, in particular to a self-locking bolt. The self-locking bolt comprises a first bolt, an elastic module and a second bolt; a first thread hole and a second thread hole are formed in the first bolt; the first thread hole is positioned in the first bolt; the second thread hole is positioned at the lower end of the first bolt; the firstbolt is an external hexagonal bolt; the elastic module is positioned at the middle part of the first bolt; the elastic module adopts a material of spring steel; the elastic module is one part of the first bolt; the first bolt is used for bolt self-locking; the second bolt is an internal hexagonal bolt, and is fixed in the first bolt through the first thread hole; the lower end of the second bolt is contacted with the upper end of the elastic module; and the second bolt is used for extruding the elastic module.

Description

technical field [0001] The invention belongs to the technical field of fasteners, in particular to a self-locking bolt. Background technique [0002] Fasteners composed of bolts and nuts are widely used in the connection of parts in machine tools, automobiles, agricultural machinery and other mechanical products. Due to their inherent defects, standard threads often loosen by themselves under severe vibration conditions, resulting in the connection The looseness of parts can cause the loss of the function of the machinery and equipment, and even lead to safety accidents. The existing methods for solving the loosening of threaded fasteners mainly include the following: inlaying nylon or elastic locking pieces, wearing anti-return pins, and installing anti-retraction elastic pads. The above methods generally have the defects of poor anti-loosening effect, complicated manufacturing or assembly process, high use cost and poor reusability. [0003] Patent document 1: A self-loc...

AI Technical Summary

Problems solved by technology

[0005] In the above-mentioned Patent Document 1, by setting a wedge-shaped slope at the bottom of the external thread, each cusp of the internal thread within its screw-in length evenly abuts tightly on the wedge-shaped slope at the bottom of the external thread, thereby producing a larger diameter than the standard thread. The greater the normal force, the great increase in the normal force also naturally greatly increases the friction between the internal and external threads, thereby achieving the purpose of preventing the loosening of the connecting thread; the invention is too one-sided and does not take into account the bolt Difficulty when screwing into the workpiece. This invention increases the difficulty when the bolt is screwed into the workpiece, which increases the wear between the two when the bolt enters the workpiece. The bolt entering the workpiece may not be able to be tightly pressed against the external thread when worn. The wedge-shaped slope at the bottom of the tooth cannot play a role in preventing loosening

[0006] In the above-mentioned Patent Document 2, another bolt whose nut is a conical block is arranged at the bottom of the bolt, and the bottom of the screw rod of the bolt is expanded and deformed by the conical block, so as to prevent loosening; , the bolt cannot be removed, which makes it more difficult to repair the equipment using the bolt

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