Extrusion assembly nut connection pair and assembly method thereof

Abstract

An extrusion assembly nut connection pair comprises an extrusion assembly nut and an external thread fastener, wherein the extrusion assembly nut comprises a nut body which is a cylinder, and a through hole is formed in the center of the nut body. The inner surface of the through hole is a smooth face, the diameter of the through hole is larger than the large diameter of external threads of the matched external thread fastener, and one end of the attached face of the nut body is provided with a flange face with a pulling and screwing structure. During assembly, firstly, the external thread fastener penetrates into an inner hole of a connecting piece, then, the tail of the external thread fastener is sleeved with the extrusion assembly nut, the extrusion assembly nut supports the outer end face of the nut body, the tail of the external thread fastener is pulled till designed clamping force is achieved, meanwhile, the outer circle face of the nut body is extruded and made to generate overall plastic deformation inwards, and the inner surface of the through hole of the nut and the external threads of the external thread fastener are totally meshed in shape so that internal threads can be formed. The extrusion assembly nut connection pair is good in anti-loosening performance, simple in structure, low in cost, easy to assemble and detach and capable of being reused.

Description

technical field [0001] The invention relates to a threaded connection pair, in particular to an extrusion assembly nut connection pair and an assembly method thereof, which is mainly suitable for improving the anti-loosening performance of the connection pair. Background technique [0002] At present, threaded connection technology has become the most widely used assembly connection technology in the connection of automobiles and various mechanical equipment. Assembly failure endangers the normal operation of automobiles and other assemblies and mechanical equipment. For cars and airplanes running at high speed, once the important bolts on key parts such as engines and transmission systems loosen during use, it will cause serious consequences of machine (car) crash and death. Therefore, for high-speed mechanical equipment such as automobiles, it is very necessary and necessary to improve the anti-loosening reliability of threaded fasteners. [0003] At present, the most wi...

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Problems solved by technology

[0007] The purpose of the present invention is to overcome the defects and problems of poor anti-loosening performance, complex structure and high cost in the prior art, and provide an extruded assembly nut connection pair with good anti-loosening performance, simple structure and low cost and its assembly method

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