Multicore Cable Outer Coating Bending Resistance
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Solution Overview
Problem
Multicore cables used in vehicles face challenges in durability due to repeated bending, particularly around wheels, which requires enhanced resistance to bending while maintaining flexibility and protection from external objects and low-temperature conditions.
Innovation Solution
A multicore cable design featuring coated electric wires with an outer coating that has a storage modulus of 100 MPa to 600 MPa at -30°C, allowing for flexibility and protection, and optionally comprising multiple coating layers with specific materials like polyurethane resin and inorganic additives to optimize bending resistance and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the outer coating is made with high storage modulus to resist bending, then bending resistance is improved, but flexibility and ability to accommodate repeated bending deteriorates
Solution Approach 1:
The invention changes the physical-chemical parameters of the outer coating by controlling its storage modulus to be within a specific range (100-600 MPa at -30°C). This parameter optimization allows the coating to provide sufficient bending resistance while maintaining the flexibility needed for repeated bending in vehicle applications.
Solution Approach 2:
The invention uses composite materials in the outer coating, specifically combining polyurethane resin with inorganic additives (such as aluminum hydroxide, magnesium hydroxide, or antimony trioxide). This composite structure achieves both high bending resistance and flexibility, resolving the contradiction between strength and adaptability.
2Strength
If the outer coating is made rigid to protect from external objects, then protection is improved, but resistance to low-temperature deformation deteriorates
Solution Approach 1:
The invention optimizes the storage modulus parameter of the outer coating to be within 100-600 MPa at -30°C. This ensures the coating maintains adequate protective strength while remaining flexible enough to resist deformation in low-temperature environments without cracking or failing.
Solution Approach 2:
The invention applies the principle of local quality by ensuring the outer coating has appropriate mechanical properties at the specific operating temperature of -30°C. The coating is designed to have sufficient rigidity for protection while maintaining local flexibility at low temperatures to prevent deformation and cracking.
Data Source
AI summary
A multicore cable includes:a plurality of coated electric wires; andan outer coating that covers an outer periphery of the plurality of coated electric wires,wherein the coated electric wires each includes a conductor and an insulating layer that covers the conductor, andwherein, in a range of 0.1 mm from an outer surface of the outer coating, a storage modules of the outer coating at −30° C. is greater than or equal to 300 MPa and less than or equal to 500 MPa.