Motor Vehicle Hose Conductive Section Design
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Solution Overview
Problem
Motor vehicle hoses with electrically conducting interior layers face issues of high cost, reduced mechanical properties at low temperatures, and compromised conductivity due to stretching during flange production and welding processes.
Innovation Solution
A motor vehicle hose design featuring electrically conducting plastic material segments that extend radially into non-conducting plastic layers, ensuring conductivity while minimizing material usage and maintaining mechanical strength, with specific thickness and coverage ratios to optimize conductivity and impact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrically conducting plastic material is used for the interior surface of the hose, then electrical conductivity is improved, but cost increases and mechanical properties deteriorate
Solution Approach 1:
The patent applies local quality by creating an electrically conducting section that extends only over a portion of the hose circumference and only partially into the wall thickness, rather than making the entire interior surface conducting. This localized approach provides sufficient conductivity for static electricity dissipation while using minimal conducting material, thereby preserving the mechanical properties of the bulk hose structure.
Solution Approach 2:
The patent uses composite materials by combining electrically conducting plastic material with non-conducting plastic material in a multi-layer construction. The conducting section is integrated into the hose wall as a composite structure, allowing the hose to achieve both electrical conductivity and mechanical strength through the synergistic combination of different material properties.
2Ease of manufacture
If flanges are produced by cold or hot molding, then the hose can be axially fixed in clips, but the stretching process reduces conductivity by increasing distances between conducting particles
Solution Approach 1:
The patent applies preliminary action by pre-positioning the electrically conducting section in a location that will remain relatively undisturbed during flange molding. The conducting section is placed in the hose wall such that when flanges are subsequently molded, the stretching and material flow primarily affect non-conducting regions, while the conducting section maintains its particle distribution and conductivity.
Solution Approach 2:
The patent protects conductivity by localizing the conducting material in specific regions of the hose wall that are less affected by flange molding stresses. The conducting section is strategically positioned and dimensioned to remain in areas experiencing minimal stretching during the flange formation process.
3Ease of manufacture
If welding processes are used to connect hose components, then joining is achieved, but abrasion on contact areas negatively impacts conductivity particularly when the conducting layer is thin
Solution Approach 1:
The patent prepares the hose structure in advance by positioning the electrically conducting section to extend beyond the anticipated welding contact areas. This preliminary positioning ensures that even if welding abrasion occurs, the conducting material remains intact in the critical regions where conductivity is needed, as the conducting section protrudes into areas not subjected to welding friction.
4Reliability
If large amounts of electrically conducting plastic material or thicker layers are used, then conductivity is improved, but impact strength at low temperatures is reduced
Solution Approach 1:
The patent applies partial action by using only the minimum necessary amount of electrically conducting plastic material to achieve sufficient conductivity. The conducting section extends only over a portion of the circumference and only partially into the wall thickness, rather than using thick layers or full circumferential coverage. This partial application provides adequate conductivity while minimizing the negative impact on mechanical properties.
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 design ensures long-term electrical conductivity in critical areas like flanges and welding joints while reducing material costs and enhancing mechanical properties, such as impact strength at low temperatures.
Implementation Method 1
Electrically conducting plastic material refers specifically to a plastic matrix that contains electrically conducting particles, such as carbon black particles or carbon fibers
Data Source
AI summary
A motor vehicle hose consisting of plastic material, where the interior surface of the hose consists at least in segments of an electrically conducting plastic material. The invention provides for a section of electrically conducting plastic material that extends at least over a portion of the circumference of the hose and which is connected to the electrically conducting interior surface of the hose. The section extends in a radial direction into a layer of non-conducting plastic material. The section extends at least in segments in the longitudinal direction of the hose.