Electromagnetic Shield Component With Inward Protrusion
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Solution Overview
Problem
Conventional electromagnetic shield components for wire harnesses in vehicles experience a localized increase in size due to the use of crimp rings, which can lead to inefficiencies in size management and electromagnetic shielding performance.
Innovation Solution
The design incorporates a flexible shield held between two tubes, where a protrusion on the inner surface of one tube applies uniform pressure to the shield, eliminating the need for a crimp ring and reducing size, while ensuring effective electromagnetic shielding through a tubular braid and matching metal materials to prevent galvanic corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a crimp ring with a bent and protruding portion is used to connect the tubular member and braided member, then the braided member can be held firmly between the tubular member and crimp ring, but the electromagnetic shield component experiences a localized increase in size
Solution Approach 1:
Instead of making the crimp ring protrude outward to achieve the crimping function, the invention inverts the approach by creating an inward-protruding portion on the inner circumferential surface of the second tube. This inward protrusion presses the flexible shield against the first tube, achieving the same holding function while avoiding external protrusion and localized size increase.
Solution Approach 2:
The invention applies local quality by creating a specific protruding portion only at the necessary location on the inner circumferential surface of the second tube. This localized structural modification provides the required crimping function at the connection point without affecting the overall dimensions of the electromagnetic shield component.
2Ease of manufacture
If a crimp ring is used to connect the tubular member and braided member, then the connection can be achieved, but the structure becomes more complex with additional components
Solution Approach 1:
The invention merges the connection function into the second tube itself by forming an inward-protruding portion on its inner circumferential surface. This eliminates the need for a separate crimp ring component, as the second tube now directly provides the crimping action through its integrated protrusion structure.
Solution Approach 2:
The invention extracts and eliminates the unnecessary crimp ring component from the assembly. By transferring the crimping function to the second tube's inward-protruding portion, the design removes the extra component while maintaining the essential connection capability.
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
This configuration suppresses the localized size increase, enhances contact resistance, and maintains effective electromagnetic shielding, reducing the risk of galvanic corrosion and improving the structural integrity of the wire harness.
Implementation Method 1
a protrusion is provided on an inner circumferential surface of the second tube over an entire length of the inner circumferential surface in a circumferential direction, the protrusion protruding toward the flexible shield and holding the flexible shield in a pressed state between the first tube and the second tube
Implementation Method 2
an end portion of a conductive tubular member and an end portion of a conductive braided member are connected to each other by a connecting member, and a wire inserted in a continuous tubular body formed of the tubular member and the braided member is electromagnetically shielded
Data Source
AI summary
An electromagnetic shield component that includes a first tube that has conductivity; a flexible shield; and a second tube externally fitted to the first tube with the flexible shield disposed between the first tube and the second tube, wherein: a protrusion is provided on an inner circumferential surface of the second tube over an entire length of the inner circumferential surface in a circumferential direction, the protrusion protruding toward the flexible shield and holding the flexible shield in a pressed state between the first tube and the second tube, and an outer circumferential surface of the protrusion is smoother than an outer circumferential surface of a portion of the second tube where the protrusion is not formed.