Anti-loosening chute metal insert nut

Abstract

A locking oblique groove metal insert nut comprises a nut body and a metal insert with inner thread. A cylindrical slot is reserved on the lower portion of the nut body. Three diamond oblique grooves are symmetrically reserved on the outer periphery of the cylindrical slot. The metal insert is provided with three diamond protrusions which can be embedded into the diamond oblique grooves of the nut. The axial depth of each diamond oblique groove equals to the thickness of the metal insert. The metal insert is as deep as the cylindrical slot, so that the insert can be prevented from moving along a screw direction on the inner side of the nut effectively. An acute angle alpha of each diamond is larger than a lead angle beta of the inner thread of the nut, so that dislocation lifting distance of the nut and the insert is larger than the thread lifting distance, and fasteners in violent vibration or power load can be locked effectively. By combining the metal insert with the slotted nut, loosening caused by vibration and power load can be prevented effectively. Compared with the prior art, the locking oblique groove metal insert nut is easy to mount and demount and reusable, no holes need to be drilled on the screw, and safety of the screw is improved.

Description

technical field [0001] The invention relates to an anti-loosening chute metal insert nut. Background technique [0002] In order to prevent the nut from loosening after tightening, ordinary threaded fasteners mainly adopt double nut tightening, elastic washer, cotter pin, stop washer, series steel wire, nylon insert, nut slotting, etc. The method of tightening double nuts will still loosen in strong vibrations, and the loose nuts will fall off in severe cases. Due to the addition of a nut, the material is wasted, and the length of the bolt needs to be increased at the same time. The loosening effect of adding elastic washers is not good, and adding cotter pins, stop washers and series steel wires requires turning on the screw rod or nut, and the process is cumbersome. The anti-loosening method of nylon inserts is easy to be damaged in repeated disassembly and assembly. Some manufacturers use metal inserts for anti-loosening, but due to structural design and other problems, ...

AI Technical Summary

Problems solved by technology

This structure still has problems such as screw drilling, the process is cumbersome, and stress concentration is likely to occur at the pin hole in a high-load vibration environment, resulting in screw breakage

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