Tube Fitting Plating Thickness for Stable Axial Force and Torque
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Solution Overview
Problem
Tube fittings used in automobile tubing experience a decrease in axial force and corotation torque when repeatedly fastened and unfastened, leading to potential loosening and damage due to vibration, necessitating a method to maintain initial connection force and prevent excessive corotation torque.
Innovation Solution
A method to calculate the average plating thickness of a tube fitting with a zinc-based plated layer and a resin coating layer, including polyethylene-based substances and solid particles, to stabilize axial force and control corotation torque, using specific dimensions and areas for measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pipe joint system with separate gasket and sealing component is used, then sealing reliability is improved, but device complexity increases
Solution Approach 1:
The patent combines the gasket and sealing component into a single integrated sealing element. The sealing component includes an elastomeric body with integrated sealing surfaces and features that directly contact both the ferrule and barrel, eliminating the need for separate gasket and sealing component assemblies while maintaining reliable sealing performance.
Solution Approach 2:
The sealing component serves multiple functions simultaneously: it provides sealing against the ferrule, seals against the barrel, accommodates dimensional variations, and facilitates assembly. This multi-functional design replaces what previously required multiple separate components, reducing overall system complexity while maintaining reliability.
2Adaptability or versatility
If compression force is increased to accommodate dimensional variations, then adaptability is improved, but the risk of exceeding material yield strength increases
Solution Approach 1:
The sealing component is designed with compliant elastomeric material properties that allow it to deform and accommodate dimensional variations in the barrel and ferrule. The elastomeric body can elastically deform under compression to adapt to size variations without requiring excessive compression forces that would exceed material yield strength.
Solution Approach 2:
The sealing component uses composite construction with an elastomeric body providing compliance and metal reinforcement elements providing structural support. This composite design allows the sealing component to accommodate dimensional variations through elastomeric deformation while the metal reinforcement prevents excessive compression that would cause yielding.
3Adaptability or versatility
If a compliant sealing component is used to accommodate dimensional variations, then adaptability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The sealing component utilizes elastomeric material with controlled durometer and hardness properties that provide inherent compliance. This material property selection allows the component to accommodate dimensional variations through elastic deformation, reducing the need for extremely tight manufacturing tolerances on the barrel and ferrule while maintaining adaptability.
Solution Approach 2:
The sealing component features localized sealing surfaces with specific geometric configurations that concentrate compliance where needed. The elastomeric body provides localized deformation capability at the sealing interfaces, allowing adaptability to dimensional variations without requiring high manufacturing precision across the entire component.
4Reliability
If the sealing component is designed to seal against both ferrule and barrel, then sealing reliability is improved, but device complexity increases
Solution Approach 1:
The sealing component integrates multiple sealing functions into a single element. It includes a first sealing surface that contacts the ferrule and a second sealing surface that contacts the barrel, both formed as integral features of the same elastomeric body, eliminating the need for separate gasket and sealing component assemblies.
Solution Approach 2:
The sealing component performs multiple sealing functions simultaneously: it seals against the ferrule to prevent leakage, seals against the barrel to prevent leakage, and accommodates dimensional variations. This multi-functional design achieves reliable sealing of both interfaces while reducing the total number of components required.
Data Source
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AI summary
A tube fitting includes: a zinc-based plated layer; and a resin coating layer that is positioned at an outermost surface at an outer side of the zinc-based plated layer and includes a polyethylene substance, a lubricant, and solid particles. When a fitting average plating thickness t relating to the thickness of the zinc-based plated layer is defined, 2.1 < t < 19.7 is true.