Anti-loosening bolts and anti-loosening bolt assemblies

Abstract

The invention relates to an anti-loosening bolt and an anti-loosening bolt assembly. The anti-loosening bolt includes a bolt head and a screw rod; the bolt head is arranged at one end of the screw rod, and is used for matching with an adapted screwing tool to apply torque to the anti-loosening bolt; An expansion cavity is provided on the end surface of the screw rod away from the bolt head, and the cavity wall of the expansion cavity is provided with a slot extending radially through the screw rod; the expansion cavity allows the head of the expansion screw to enter and connects with the expansion screw. The tapered head is adapted so that the corresponding section of the screw rod expands radially when the expansion screw is tightened; the wall of the expansion chamber is provided with a snap-in boss, which forms a stop step facing the bolt head ; The stop step surface is used to stop and cooperate with the expansion screw moving towards the bolt head and the head crosses the clamping boss, so as to prevent the expansion screw from withdrawing outwards, so that the expansion screw cannot withdraw from the expansion cavity, and then The expansion cavity of the anti-loosening bolt is always in a state of radially expanding expansion, which ensures that the anti-loosening bolt has a better anti-loosening effect.

Description

technical field [0001] The invention belongs to the field of fasteners, and in particular relates to an anti-loosening bolt and an anti-loosening bolt assembly. Background technique [0002] The anti-loosening performance of fasteners has always been an important research index in the field of fasteners. At present, there are many anti-loosening forms, but most of them are anti-loosening technologies for nuts. The common ones include punching point riveting on the end face of the nut and glue coating on the thread. , Hexagonal slotted nut with cotter pin, use stop washer, series steel wire, double nut, use spring washer, closed self-locking nut, nylon insert nut, etc. At present, the anti-loosening forms of closed self-locking nuts and nylon insert nuts are widely used in the aerospace field, but the friction of the thread pair in the above-mentioned nut anti-loosening forms is large, and the torque decays quickly after repeated disassembly and installation, which will make ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide an anti-loosening bolt to solve the technical problem that the anti-loosening part of the anti-theft bolt in the prior art is screwed in the screw rod and is easily subjected to external vibrations so that the anti-loosening effect is reduced; the present invention also provides A kind of anti-loosening bolt assembly comprising the above-mentioned anti-loosening bolt

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