Pipe Connection Screw Coating for Tightening and Anti-Loosening
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Solution Overview
Problem
Existing screw elements for connecting motor vehicle pipelines, such as brake pipes, face difficulties in maintaining a secure connection due to reduced sliding friction during tightening, making it harder to loosen the screw connection, and the coating application processes are time-consuming and costly.
Innovation Solution
A union screw with a metal substrate, featuring an inner coating of lubricating nanoparticles between the outer coating and the substrate, where the inner coating is applied only on contact surfaces and contains a polymer and nanoparticles of a lubricating solid, while the outer coating covers the majority of the screw element, providing a higher coefficient of friction to prevent loosening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an outer coating with lower coefficient of friction is applied to contact surfaces, then tightening is easier, but the screw connection becomes harder to loosen and may unintentionally loosen
Solution Approach 1:
The patent applies different friction characteristics to different locations: the outer coating with lower friction is applied only to contact surfaces to facilitate tightening, while the thread region retains higher friction to prevent unintentional loosening. This spatial differentiation of friction properties resolves the contradiction between ease of tightening and connection security.
Solution Approach 2:
The coating system is segmented into an outer coating layer and an inner coating layer with distinct functions. The outer coating provides low friction at contact surfaces for easy tightening, while the inner coating provides high friction at the thread region for secure connection, preventing the contradiction from manifesting.
2Reliability
If traditional electroplating or vapor deposition is used to apply coatings, then corrosion resistance is improved, but the process becomes time-consuming and costly
Solution Approach 1:
The patent replaces traditional electroplating or vapor deposition processes with a coating application method that is faster and less costly. The coating is applied in a manner that avoids the time-consuming and expensive traditional methods while maintaining corrosion resistance through the dual-layer coating structure.
Solution Approach 2:
The patent changes the application parameters of the coating process to achieve faster application. By modifying how the coating is applied (using a different method than electroplating or vapor deposition), the process becomes less time-consuming and costly while still providing adequate corrosion protection.
3Reliability
If a continuous inner coating is applied over the entire screw element, then corrosion protection is maximized, but dimensional accuracy and coating application precision become more difficult to achieve
Solution Approach 1:
The inner coating is applied selectively only where corrosion protection is most critical (thread region and contact surfaces) rather than continuously over the entire screw element. This localized application maintains adequate corrosion protection while improving dimensional accuracy and reducing coating application complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively prevents unintentional loosening by allowing the coatings to slide over each other during tightening, maintaining a secure connection and enhancing corrosion resistance through crack prevention, while being easier and less expensive to apply, with improved dimensional accuracy.
Implementation Method 1
the inner coating being arranged in the region of the at least one contact surface, the outer coating containing a first polymer and nanoparticles of a first solid, the inner coating containing nanoparticles of a lubricating solid
Implementation Method 2
the outer coating containing a first polymer and nanoparticles of a first solid... the first solid has a Mohs hardness of >7 and preferably >8
Data Source
Figure 1
Figure 2
AI summary
A screw element (1) for connecting pipelines (2), preferably automotive pipelines. The screw element has a thread (3) and at least one unthreaded contact surface (4, 5). The screw element has an outer coating (7) and an inner coating (8). The outer coating (7) contains a first polymer and nanoparticles of a first solid.