Spring Coupled Shielding Braid for Thermal Stability
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Solution Overview
Problem
Existing electromagnetic shielding components in vehicular wire harnesses face deterioration in shielding properties due to thermal expansion and contraction, leading to increased contact resistance and potential oxide layer formation, especially when materials with different linear expansion coefficients are used.
Innovation Solution
An electromagnetic shielding component featuring a conductive pipe body and a tubular braid coupled by a spring coupler with a radially inward elastic force, where the spring's diameter can reduce to match the pipe body's outer diameter during temperature changes, ensuring consistent fastening and preventing oxide layer formation, along with an insulator to prevent corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal crimp ring is used to couple the metal pipe and braided member, then the fastening is initially secure, but thermal expansion and shrinkage cause the fastening to become loose over time
Solution Approach 1:
The patent replaces the static crimp ring with a dynamic spring mechanism that can adapt its diameter. The spring's elastic properties allow it to expand and contract with thermal changes, maintaining constant fastening pressure on the braided member regardless of temperature fluctuations, thus preventing loosening while preserving shielding reliability
Solution Approach 2:
The spring's diameter is designed to change in response to temperature variations. By selecting a spring with appropriate elastic characteristics, the system accommodates thermal expansion and contraction of the metal pipe, ensuring the spring maintains optimal contact pressure and fastening tightness across the full temperature range, preventing oxide layer formation and maintaining low contact resistance
2Reliability
If the spring diameter is reduced to accommodate pipe shrinkage at low temperatures, then fastening remains tight, but the spring must be pre-compressed which increases initial stress
Solution Approach 1:
The spring is pre-compressed during assembly to a controlled degree, establishing an initial contact force between the spring, metal pipe, and braided member. This preliminary action ensures that even when the pipe shrinks at low temperatures, the spring maintains sufficient compression to prevent loosening, while the pre-compression is carefully calculated to avoid excessive initial stress that would compromise the system
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 suppresses the deterioration of shielding properties by maintaining consistent contact resistance and preventing corrosion, even under varying temperatures, thus enhancing the electromagnetic shielding performance.
Implementation Method 1
the spring has a diameter that is reduced due to a radially inward elastic force of the spring... configured to sandwich and hold the braid together with the pipe body only using the radially inward elastic force of the spring
Implementation Method 2
the diameter of the spring being able to be reduced using the radially inward elastic force of the spring in accordance with shrinkage in an outer diameter of the pipe body that is caused due to a reduction in the temperature in the usage environment
Data Source
AI summary
An electromagnetic shielding component that includes a pipe body that is conductive; and a braid that is tubular and that is obtained by braiding conductive bar wires, the braid and the pipe body being coupled to each other by a coupler in a state in which an end of the braid is externally fitted onto an end of the pipe body.