Electric Wire Protective Member with Integrated Fastening
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Solution Overview
Problem
Conventional electric wire protection tubes have issues with attaching accuracy and workmanship due to loose fit and potential for diameter change after attachment, leading to poor positioning and increased complexity in attaching the tube to the wire harness.
Innovation Solution
An electric wire protective member with a cylindrical protection tube and an integrated ring-shaped covering portion and fastening plate that restricts movement of the wires, allowing for accurate positioning and easy attachment using adhesive tape, along with branch line fastening features for secure branching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the inside diameter of the electric wire protection tube is made larger than the outside diameter of the wire harness to facilitate insertion, then the ease of insertion is improved, but the attaching accuracy deteriorates due to the clearance formed between the tube and wire harness
Solution Approach 1:
The invention divides the protection tube into two functional parts: a insertion portion with a larger inside diameter for easy wire harness insertion, and a distal end portion with a smaller inside diameter for accurate positioning and attachment. This segmentation allows each part to optimize its function independently, resolving the contradiction between ease of insertion and attaching accuracy.
2Strength
If adhesive tape is wound tightly to attach the distal end portion of the protection tube to the wire harness, then the attaching strength is improved, but the peripheral walls of the tube can overlap and roll, causing diameter change
Solution Approach 1:
The distal end portion of the protection tube is pre-formed with a smaller inside diameter than the wire harness outside diameter. This preliminary design feature prevents the tube walls from overlapping and rolling when adhesive tape is applied, thereby maintaining tube diameter stability while still allowing strong attachment.
3Manufacturing precision
If the protection tube and wire harness are positioned in the axial direction while drawing out adhesive tape, then the attaching precision can be improved, but the work complexity increases
Solution Approach 1:
The protection tube is pre-formed with a distal end portion that has a smaller inside diameter than the wire harness outside diameter. This preliminary structural preparation enables accurate positioning to be achieved automatically during the attachment process, eliminating the need for complex axial positioning operations and reducing work complexity.
Data Source
AI summary
An electric wire protective member includes a cylindrical electric wire protection tube, an interior of which being an electric wire insertion space, a protection tube end opening provided in the electric wire protection tube and from which electric wires inserted through the electric wire insertion space are led out, and an electric wire fastening member having an electric wire fastening plate on which the electric wires led out through the protection tube end opening are placed. The electric wire fastening plate is molded integrally with a ring-shaped covering portion covering the electric wire protection tube near the protection tube end opening.