Anti-Loosening Threaded Pair With Radial Displacement Stoppers
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Solution Overview
Problem
Threaded connections in mechanical systems are prone to loosening under conditions of vibration, impact, and alternating temperature, leading to reduced connecting force and potential structural failure.
Innovation Solution
An anti-loosening screw pair design featuring a first screw component with an inner screw thread and a second screw component with an outer screw thread, where force-bearing fitting faces and non-force-bearing fitting regions are equipped with stoppers, such as protrusions and grooves, to prevent radial displacement and maintain connection tightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional threaded connection is used, then the connection is easy to assemble and disassemble, but the connection is prone to loosening under vibration and impact
Solution Approach 1:
The thread structure is segmented into distinct functional zones: force-bearing fitting faces for load transmission, non-force-bearing fitting regions for positioning, and stopper structures (protrusions and grooves) for anti-loosening. This segmentation allows each zone to perform its specific function optimally while maintaining overall thread integrity.
Solution Approach 2:
Different regions of the thread are given different geometric properties and functions. The force-bearing fitting faces have specific angular orientations for load bearing, while the non-force-bearing fitting regions provide radial positioning. Stoppers are locally added at critical positions to prevent loosening without affecting the overall thread engagement.
2Manufacturing precision
If stoppers are added to prevent radial displacement, then connection tightness is improved, but manufacturing complexity increases
Solution Approach 1:
The stopper structures (protrusions and grooves) are pre-formed as integral parts of the thread components during manufacturing. This preliminary action ensures that the anti-loosening feature is built-in from the start, eliminating the need for separate assembly steps or additional fastening operations.
Solution Approach 2:
The stopper structures are merged with the thread geometry itself, combining the fastening function and the anti-loosening function into a single integrated structure. The protrusions and grooves are formed as part of the thread machining process, reducing the number of separate components and assembly steps.
3Force
If force-bearing fitting faces are designed with specific orientations, then load bearing capacity is improved, but thread geometry complexity increases
Solution Approach 1:
The thread profile employs asymmetric geometry where the force-bearing fitting faces have specific angular orientations that differ from the non-force-bearing regions. This asymmetry allows the thread to optimize load bearing in the primary stress direction while maintaining compatibility with standard threading conventions.
Solution Approach 2:
The thread design incorporates three-dimensional surface features including angled fitting faces and radial stoppers that extend beyond the conventional two-dimensional thread profile. This dimensional enhancement allows for improved load distribution and anti-loosening performance while maintaining a relatively simple base thread form.
Data Source
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AI summary
The present disclosure provides an anti-loosening screw pair and an anti-loosening screw component. The screw pair includes a first screw component provided with a first screw thread and a second screw component whose outer wall surface is provided with a second screw thread. The first and second screw components are in threaded connection. In a direction of the first screw component being screwed into the second screw component, sides of the first and second screw threads pressing against each other are formed into force-bearing fitting faces respectively, and opposite sides thereof are formed into non-force-bearing fitting regions respectively. At least one of the force-bearing fitting faces and the non-force-bearing fitting regions of the first and the second screw components is provided with a stopper so as to prevent radial displacement between the first and the second screw components.