Composite Cable Pair Asymmetric Twisting for Durability
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Solution Overview
Problem
Conventional composite cable pairs for electric braking and parking braking in automobiles experience reduced durability due to uneven twisting directions, leading to reliability issues and increased costs when trying to address these differences.
Innovation Solution
A composite cable pair design where the wires in each cable bundle are twisted in opposite directions to maintain twist tightening without loosening, reducing durability differences between right and left wheels and enhancing reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wires in both composite cables are twisted in the same direction (either S-twisting or Z-twisting), then the manufacturing process is simple and consistent, but one cable experiences twist tightening while the other experiences twist loosening during steering, reducing durability and reliability
Solution Approach 1:
The patent applies asymmetry by twisting the wires in the right-wheel composite cable in one direction (e.g., S-twisting) and the wires in the left-wheel composite cable in the opposite direction (e.g., Z-twisting). This asymmetric configuration ensures that both cables experience twist tightening rather than one tightening and one loosening during steering operations, thereby improving durability and reliability.
2Reliability
If the material of the wires in one composite cable is changed to have excellent twist resistance, then the durability difference between left and right cables is eliminated, but the manufacturing cost increases
Solution Approach 1:
Instead of changing the material of wires in one cable to have excellent twist resistance (which would increase cost), the patent applies local quality by using opposite twisting directions for the two cables. This allows both cables to have the same material composition while achieving different twist behaviors locally, eliminating durability differences without increasing manufacturing costs.
Data Source
AI summary
Provided is a composite cable pair with which it is possible to reduce the difference in durability between a right-wheel composite cable and a left-wheel composite cable. A composite cable pair includes a right-wheel composite cable and a left-wheel composite cable. One end of the composite cable is fixed to a cable fixing portion on the vehicle body side or the chassis side of an automobile, and the other end thereof is fixed to a cable fixing portion on the right wheel side. One end of the composite cable is fixed to a cable fixing portion on the vehicle body side or the chassis side of the automobile, and the other end thereof is fixed to a cable fixing portion on the left wheel side. Wires of the respective wire bundles of the composite cable and the composite cable are twisted in twisting directions that are opposite to each other so that the twisting is tightened, without loosening, by an operation of the handle.