Coil Spring Cartridge Waveguide Layout for Automotive Ethernet
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Solution Overview
Problem
Existing coil spring cartridges in motor vehicles face challenges in achieving rapid and interference-free data transfer due to limitations in line geometry and impedance, requiring thicker flat cables that compromise flexibility and mechanical durability.
Innovation Solution
A coil spring cartridge design incorporating at least three flexible flat cables and three flat ribbons, arranged in a specific sequence and configuration to form a waveguide geometry, ensuring adapted impedance and mechanical flexibility for rapid data transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If standard flat cables are used for data transfer, then mechanical flexibility is maintained, but impedance adaptation for rapid data transfer is not achieved
Solution Approach 1:
The flat cable is segmented into multiple individual conductors (e.g., four conductors arranged in a specific pattern) rather than a single solid conductor. This segmentation allows each conductor to be positioned precisely to achieve the desired impedance characteristics while maintaining flexibility. The conductors are separated by insulating material, enabling independent positioning and impedance control.
Solution Approach 2:
The cable structure employs local quality variations through different conductor arrangements, insulating material properties, and spacing configurations in specific sections. The impedance-adapted geometry is achieved by locally optimizing the conductor layout and insulation thickness in the winding gap region, while other parts of the cable maintain standard flexible construction.
2Reliability
If thicker flat cables are used to achieve adapted impedance, then impedance matching is improved, but mechanical flexibility and durability deteriorate
Solution Approach 1:
Instead of increasing cable thickness in the conventional dimension, the solution transitions to a multi-dimensional conductor arrangement within the flat cable plane. The conductors are positioned at specific coordinates with precise spacing and orientation, creating an impedance-adapted geometry that achieves the desired electrical characteristics without increasing overall cable thickness, thereby preserving flexibility.
3Stability of the object's composition
If multiple flat cables are used to ensure proper mechanical functioning, then mechanical stability is improved, but cost increases due to replacement of functional cables with dummy cables
Solution Approach 1:
The flat cable design achieves multi-functionality by simultaneously providing electrical data transfer capability and mechanical stabilization function. The impedance-adapted geometry with multiple conductors arranged in a specific pattern enables both rapid data transfer and sufficient mechanical rigidity, eliminating the need for separate dummy cables while maintaining mechanical stability.
Data Source
AI summary
A coil spring cartridge includes a cylindrical stator housing part and a rotor housing part, three flexible flat cables each having at least one electrical conductor, and a flexible flat ribbon lacking an electrical conductor. The flat cables and the flat ribbon with their respective ends are fastened on the one hand to the stator housing part and on the other hand to the rotor housing part, and are wound so tightly on the respective housing parts that a U-shaped reversal section that reverses the winding direction is formed between their ends. The flexible flat cables and the flat ribbon, when contacting each of the lateral faces of the winding gap, cooperate in their sequence of superposition and in their respective internal configuration to form a desired waveguide geometry.