Wiring Structure With Positioning Fixing Portion For Constant Protruding Length
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Solution Overview
Problem
Conventional wiring structures face challenges in managing the protruding length of electrical wires, leading to potential misalignment of connectors, especially when exposed to high temperatures, as the resin base member expands, affecting the fixing force and causing displacement of electrical wires.
Innovation Solution
A wiring structure with a resin-based wiring member featuring a positioning/fixing portion and a band member that includes a lockable coupling mechanism to maintain constant protruding length, utilizing a claw-shaped anti-separation protrusion to secure the band member in place even under thermal expansion, ensuring the electrical wires remain fixed relative to the wiring surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the cover prevents the trunk portions from coming out, then the electrical wires are retained in the base member, but the trunk portions can move in the lengthwise direction causing mismanagement of branch portions
Solution Approach 1:
The positioning/fixing portion is provided in advance on the wiring member at the lead-out position. This preliminary structure enables precise positioning of the electrical wires before connector fitting, ensuring that the branch portions protrude by a predetermined length and are properly aligned for connector installation.
Solution Approach 2:
The positioning/fixing portion acts as an intermediary element between the wiring member and the electrical wires. It provides a reference surface that directly contacts and positions the electrical wires, ensuring accurate protruding length and alignment without relying solely on the cover structure.
2Strength
If the positioning/fixing portion has strong fixing force, then the electrical wires are securely held, but thermal expansion of the resin wiring member reduces the fixing force
Solution Approach 1:
The positioning/fixing portion is divided into multiple functional elements: the reference surface for positioning, the coupling member holding piece for securing, and the anti-separation protrusion for preventing displacement. This segmentation allows each element to perform its specific function optimally while collectively maintaining reliable fixing under thermal conditions.
Solution Approach 2:
The anti-separation protrusion is designed to preemptively counteract the loosening effect of thermal expansion. By providing this protrusion that prevents separation in advance, the structure compensates for the reduction in fixing force due to thermal expansion of the resin wiring member.
3Strength
If the coupling member holding piece is rigid, then the anti-separation protrusion provides strong locking, but the structure becomes complex and difficult to assemble
Solution Approach 1:
The coupling member holding piece is designed with flexibility to pivot about the wiring surface side. This dynamic characteristic allows the holding piece to adapt during assembly and operation, providing strong locking when needed while maintaining simplicity in structure and ease of assembly.
Solution Approach 2:
The coupling member holding piece functions as a flexible element that can bend and pivot. This flexibility enables the anti-separation protrusion to engage effectively with the insertion space while keeping the overall structure simple and easy to manufacture and assemble.
Data Source
AI summary
Provided is a wiring structure that can manage a protruding length of a led-out portion of an electrical wire so as to be constant. The wiring structure includes: a wiring member that is made of resin and has a wiring surface; and an electrical wire that includes a portion routed along the wiring surface and a portion led out from the wiring surface, the portion led out having an end portion to which a connector is to be attached. A positioning/fixing portion is provided integrally with the wiring member at a position in the vicinity of a lead-out position on the wiring surface of the wiring member, the electrical wire being led out from the lead-out position.