Fastener capable of preventing automatic rolling movement in loosening direction

Abstract

The invention discloses a fastener capable of preventing automatic rolling movement in a loosening direction. The fastener comprises a bolt, a first nut, a gasket and a second nut, the center of the gasket is provided with a through hole for a screw rod of the bolt to pass through, and the top of the gasket is provided with a conical convex surface. A conical concave surface is arranged at one end of the second nut, and after the bolt, the first nut, the gasket and the second nut are mounted and screwed on a workpiece, the bottom of the first nut is in contact with the workpiece. The bottom of the gasket is in contact with the top of the first nut. After the gasket deforms, a contact structure without a transverse gap is formed between the conical convex surface and the conical concave surface, and a contact structure without a transverse gap is formed between a through hole and the external thread of the bolt. Therefore, during transverse vibration or impact, the first nut, the second nut and the bolt can be effectively prevented from continuously rolling in the loosening direction.

Description

Technical field[0001]The present invention relates to the field of fasteners, and more particularly to a fastener that prevents automatic rolling motion in the loose direction.Background technique[0002]Objectively, the inner screw and the outer screw are automatically rotated in the relative loose direction there in the relative loose direction (e.g., the internal threads will generate slider rotation in the opposite looming direction under the action of rotation inertia) and rolling movement. There are two ways without fixed-axis lateral rotation.[0003]Inventors "new cylindrical thread joint anti-loose principle and anti-loosening technology" [China New Technology New Products, 2015.10 (on)], theoretical analysis and experimental results have been proved "cylindrical threads in transverse vibration" The looseness generated in the environment in the environment is within, the unmatched axis transverse rotational motion (rolling motion) between the external ribs, and therefore, as lo...

AI Technical Summary

Problems solved by technology

[0005] The technical scheme of "Double Nut Threaded Connection to Prevent Automatic Rolling Movement in the Loosening Direction" with the notification number CN208252561U designed by the inventor has the following disadvantages: at the same time, the connection between the upper flank of the internal thread of the second nut and the lower flank of the external thread of the bolt is realized. The structure of mutual contact between the lower flank of the internal thread of the first nut and the upper flank of the outer thread of the bolt can effectively prevent the contact between the first nut, the second nut and the bolt during lateral vibration or impact. Continuous rolling motion in the loosening direction, that is, the axial force on the top of the first nut is greater than the initial clamping force, in order to effectively prevent the continuous movement between the first nut, the second nut and the bolt during lateral vibration or impact. Therefore, it is difficult to control the clamping force on the workpiece when implementing this technical solution

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