Crimp Ferrule Geometry for Oval Cable Shield Crimping
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Solution Overview
Problem
Conventional crimp ferrules are designed for circular shields in multi-core cables, which are becoming increasingly oval, leading to inefficiencies in crimping and signal integrity issues in high-frequency applications.
Innovation Solution
A crimp ferrule with a circumferential center portion and flanks, featuring crimp diameter compensation elements that adapt to non-circular cable cross-sections, ensuring a secure crimped connection and maintaining signal integrity by maintaining a substantially circular outer shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional crimp ferrules are designed for circular shields, then they can be manufactured with simple geometry, but they cannot effectively secure connections on non-circular cable shields
Solution Approach 1:
The ferrule incorporates asymmetric compensation elements that extend preferentially in one circumferential direction to compensate for the non-circular (oval) cross-section of the cable shield. These elements create an asymmetric geometry that matches the asymmetric cable shape, enabling effective mechanical engagement and signal integrity maintenance despite the non-circular shield configuration.
Solution Approach 2:
The ferrule features localized compensation elements at specific positions around its circumference rather than uniformly modifying the entire structure. These local geometric modifications (protrusions, indentations, or varying wall thicknesses) are strategically placed to compensate for the oval shape of the cable shield while maintaining a substantially circular overall outer shape for compatibility with standard crimping tools and connectors.
2Adaptability or versatility
If the cable shield cross-section becomes increasingly oval, then cable manufacturing flexibility improves, but crimping efficiency and signal integrity deteriorate
Solution Approach 1:
The compensation elements introduce asymmetric features into the ferrule geometry that specifically address the asymmetric oval shape of modern cable shields. This asymmetric design enables the ferrule to maintain effective mechanical contact and electrical connection during crimping operations, preserving crimping efficiency despite the cable shield's non-circular cross-section.
Solution Approach 2:
The ferrule design incorporates variable geometric parameters including different wall thicknesses, protrusion heights, and indentation depths at different circumferential positions. These parameter variations allow the ferrule to adapt to the oval cable shield shape while maintaining a substantially circular outer profile, ensuring both crimping efficiency and signal integrity in high-frequency applications.
3Adaptability or versatility
If the ferrule maintains a substantially circular outer shape, then compatibility with standard connectors is maintained, but effectiveness on non-circular shields is reduced
Solution Approach 1:
The ferrule maintains a substantially circular outer shape for overall compatibility while incorporating localized compensation elements at specific positions. These local geometric features (protrusions, indentations, or thickness variations) provide the necessary adaptation to non-circular cable shields without compromising the overall circular profile that ensures compatibility with standard connectors and crimping tools.
Solution Approach 2:
The compensation elements introduce controlled asymmetric features within the substantially circular ferrule geometry. These asymmetric local modifications enable effective engagement with oval cable shields while the overall circular shape is preserved, achieving a balance between adaptability to non-circular shields and compatibility with standard connector interfaces.
Data Source
AI summary
An electrical crimp ferrule includes a circumferential center portion, a first circumferential flank connected to the center portion, and a second circumferential flank connected to the center portion. The circumferential center portion integrally connects the first and second circumferential flanks. At least one crimp diameter compensation element extends from at least one of the first circumferential flank or the second circumferential flank and is adapted to engage with an electrical cable having a non-circular cross section in a crimped state of the ferrule.