Protective Tube Connection Structure for Electric Wire Vibration Damage
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Solution Overview
Problem
Existing protective tube connections for electric wires in vehicles fail to effectively mitigate damage from vehicle vibrations, as the cutting edges of corrugated tubes made of hard resin can cause insulation coating damage and the rib protrusions can lead to further interference.
Innovation Solution
A protective tube connection assembly featuring a wire support portion on the bottom plate of the protector with an engagement rib and abutment protrusion that inclines the electric wire away from the cutting edge, a flat placement surface to reduce pressure on the insulation coating, and band insertion holes to secure the tie band, preventing direct contact and sliding damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the harness tube is made of hard resin to provide protection, then the protective performance is improved, but the cutting edge causes damage to the insulation coating
Solution Approach 1:
The patent introduces a wire support portion as an intermediary element between the cutting edge of the harness tube and the electric wire. This support portion, which includes a flat placement surface, receives and supports the electric wire, preventing direct contact with the sharp cutting edge. The mediator absorbs the harmful interaction while maintaining the protective function of the hard resin harness tube.
Solution Approach 2:
The wire support portion is positioned in advance at the end portion of the harness tube to cushion the electric wire from potential damage by the cutting edge. This preventive measure ensures that even when the harness tube is cut and has a sharp edge, the wire is already protected by the support structure before any harmful contact can occur.
2Manufacturing precision
If the rib is provided to restrict the harness tube from entering the protector, then the positioning accuracy is improved, but the rib causes interference with the electric wire
Solution Approach 1:
The wire support portion acts as a mediator between the rib and the electric wire. The rib maintains its positioning function by restricting the harness tube, while the wire support portion ensures the electric wire does not come into contact with the rib, thus eliminating the harmful interference while preserving the positioning accuracy.
Solution Approach 2:
The wire support portion extends in a direction from the end portion of the harness tube, creating a spatial separation in another dimension. This dimensional arrangement allows the rib to perform its restriction function while the wire support portion provides a clear path for the electric wire, avoiding interference through spatial separation.
3Stability of the object's composition
If the electric wire is fixed by the tie band in the protector, then the stability is improved, but the vibration transmits damage to the wire
Solution Approach 1:
The wire support portion with its flat placement surface provides beforehand cushioning for the electric wire, absorbing and distributing vibration forces before they can cause damage. The support structure acts as a buffer that maintains stable fixation while mitigating the harmful effects of vibration transmitted through the tie band and protector.
Data Source
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AI summary
A protective tube connection structure includes a protective tube through which an electric wire is inserted and has alternately large diameter portions and small diameter portions; and a covering member where an end portion of the protective tube is fixed, the electric wire led out from the end portion being disposed inside the body portion. A wire support portion is provided on a bottom plate portion vertically below the covering member such that the electric wire led out from the end portion of the protective tube is placed on the wire support portion at first and the wire support portion is located vertically above an inner surface of the small-diameter portion on an endmost side.