Radiating Pre-Embedded Nut Structure to Prevent Plastic Rotation
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Solution Overview
Problem
Conventional pre-embedded nuts in plastic components are prone to loosening due to excessive torque, causing damage to the surrounding plastic and making repair difficult, as they rotate within the plastic casing during repeated assembly and disassembly processes.
Innovation Solution
A pre-embedded anti-loosening nut with a main body and radiating portions, where the radiating portions form acute and obtuse angles and are disposed at equal intervals around the periphery, providing enhanced resistance to torsional forces and maintaining secure attachment to the plastic component, even under high torque conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional circular or hexagonal nuts are used in plastic components, then the assembly process is simple, but the nuts rotate and loosen under repeated torque during assembly and disassembly
Solution Approach 1:
The nut adopts an asymmetric star-shaped structure with five radiating portions having different orientations. This asymmetric geometry prevents rotational movement in any direction, as the radiating portions create uneven contact points with the plastic component that block rotation regardless of the applied torque direction.
Solution Approach 2:
The nut body is segmented into multiple radiating portions (five in total) that extend outward from the central threaded hole. This segmentation creates multiple contact zones with the plastic component, distributing the locking force across different regions and preventing rotation through multi-point engagement.
2Reliability
If small serrations are placed on the periphery of the nut to strengthen fixing force, then the nut resistance improves, but the surrounding plastic component is damaged more seriously under large locking torque
Solution Approach 1:
Instead of adding serrations to the entire periphery, the design uses five specific radiating portions strategically positioned around the nut body. Each radiating portion creates a localized contact point that provides sufficient friction and mechanical interlocking without the need for additional serrations, thereby preventing plastic damage while maintaining nut resistance.
3Reliability
If the radiating portions are designed with acute and obtuse angles, then the anti-loosening performance is enhanced, but the manufacturing complexity increases
Solution Approach 1:
The radiating portions are designed with asymmetric angular characteristics, featuring acute angles on one side and obtuse angles on the other. This asymmetric angular design creates optimal mechanical interlocking with the plastic component, enhancing anti-loosening capability while maintaining a relatively simple single-piece molded structure that is manufacturable.
Data Source
AI summary
The disclosure provides a pre-embedded anti-loosening nut embedded in a plastic component. The pre-embedded anti-loosening nut includes a main body portion and a plurality of radiating portions. The main body portion has a threaded hole. The radiating portions are disposed around a periphery of the main body portion. Each of the radiating portions has a first side and a second side connected with each other. The first side and the second side form a first included angle, and the second side is connected with the first side of another adjacent radiating portion to form a second included angle.