Electric Wire Protecting Pipe with Variable Wall Thickness
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Solution Overview
Problem
Existing electric wire protecting pipes face challenges in maintaining strength to prevent hole formation from flying gravel while allowing easy bending, particularly in the bending pipe portion.
Innovation Solution
A resin electric wire protecting pipe design with a flat cross-section and varying wall thickness, featuring a thick lower wall and thin left and right walls, and a bending pipe portion with protruding and recessed portions that can be easily bent in both vertical and horizontal directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the strength of the electric wire protecting pipe is increased to prevent holes from being formed by flying gravel, then the pipe can protect against debris impact, but the bending pipe portion becomes difficult to bend
Solution Approach 1:
The patent applies local quality by varying the wall thickness at different locations of the pipe. The lower wall portion has a greater thickness to provide high strength for protecting against flying gravel impact, while the left and right wall portions have smaller thicknesses to enable easy bending in the horizontal direction. This non-uniform thickness distribution allows each part of the pipe to have the specific properties needed for its functional role.
2Ease of manufacture
If the electric wire protecting pipe is made with uniform wall thickness, then the manufacturing process is simple, but the pipe cannot simultaneously achieve both high strength and easy bending
Solution Approach 1:
The patent implements local quality through a molding process that creates different wall thicknesses in different regions. The lower wall portion is formed with greater thickness while the side wall portions have smaller thicknesses. This can be achieved through techniques such as varying the molding pressure distribution or using a specially designed mold, allowing the pipe to meet both strength and bending requirements in a single manufacturing process.
Data Source
AI summary
A wire harness and an electric wire protecting pipe that can prevent holes from being formed by flying gravel while the vehicle is moving and includes a bending pipe portion that can be bent easily. The electric wire protecting pipe is a resin pipe into which electric wires are insertable, and includes a bending pipe portion that is easily bent and is provided with protruding portions and recessed portions that are alternately continuous with each other in an axial direction, and a straight pipe portion that is flat and is not easily bent in the axial direction. A thickness of a lower wall portion that is disposed on a lower side when the electric wire protecting pipe is attached to a vehicle is greater than a thickness of a left wall portion and a right wall portion.