Flow drill screw structure capable of effectively preventing looseness
By increasing the contact area of the nail cap flange and providing a step surface and an inner groove in the flow drill screw structure, the problem of screw torque attenuation is solved and stable fixation of the screw is achieved.
CN223359632UActive Publication Date: 2025-09-19NANJING LETWITT LIGHTWEIGHT TECH RES INST CO LTD
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Patent Information
- Application Number
- CN202422226638.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-11
- Publication Date
- 2025-09-19
- Estimated Expiration
- 2034-09-11
AI Technical Summary
Technical Problem
In the existing flow drill screw connection process, the torque value of the screw is easily attenuated after tightening, causing the screw to loosen, which is more obvious under changes in the external environment.
Method used
A flow drill screw structure is designed to increase the diameter and contact area of the nail cap flange, and set a step surface and inner groove at the lower end of the flange to increase friction, adapt to the deformation of the plate, form annular protrusions and depressions, and improve friction.
Benefits of technology
It effectively reduces torque attenuation, enhances the fixing stability of the screw, and adapts to slight deformation under different material working conditions.
✦ Generated by Eureka AI based on patent content.
Abstract
The utility model relates to the technical field of flow drill screws, in particular to a flow drill screw structure capable of effectively preventing looseness, which comprises a screw body, one end of the screw body is fixedly connected with a screw cap, the lower end face of the screw cap is provided with a screw cap flange integrated with the screw cap, and the inner side of the periphery of the lower end face of the screw cap flange is provided with a first step surface. A second step surface is arranged on the outer side of the periphery of the lower end surface of the nail cap flange, and the radius of the lower end surface of the nail cap flange is 2.7 mm, so that under the condition that the sizes of the nail caps are consistent, the contact area is increased, the friction force is effectively improved, the widths of the first step surface and the second step surface are 0.07 MM and 0.1 MM respectively, the angle is about 8 degrees formed by outward opening of the nail feet, and the service life of the nail caps is prolonged. The structure is beneficial to adapting to the working condition that the material is soft or hard, when the plate slightly deforms, such as warping or bending, the two steps form the annular protrusion and the annular recess, friction force can be effectively increased, and therefore the purpose of reducing torque attenuation is achieved.
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