Resin Fixture Mounting Structure Using Biting Retention
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Solution Overview
Problem
Existing resin fixtures for mounting wire harnesses to vehicle instrument panels require metal components, increasing component count and cost, and often have complex shapes, which is undesirable.
Innovation Solution
A resin fixture with a body portion having a protruding insertion hole and a placement portion, where a protrusion on the inner wall engages with the columnar portion of the instrument panel, allowing secure mounting without metal components and simplifying the shape of the columnar portion, using a biting phenomenon to prevent disengagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flat spring made of metal is used to fix the resin fixture, then the resin fixture can be firmly fixed to the instrument panel, but the number of components increases and cost increases
Solution Approach 1:
The patent combines the fixing function and the fixture body into a single integrated resin component. The resin fixture includes an engagement portion with engagement protrusions that directly engage with the columnar portion of the instrument panel, eliminating the need for separate metal fasteners or flat springs. This merging of functions reduces component count while maintaining fixing firmness through the elastic deformation capability of the resin material.
2Reliability
If a flat spring made of metal is used to fix the resin fixture, then the resin fixture can be firmly fixed to the instrument panel, but cost increases
Solution Approach 1:
The patent integrates the fixing function into the resin fixture body itself, eliminating the need for separate metal fasteners. This allows the entire fixture to be manufactured as a single molded part, reducing assembly costs and material costs associated with multiple components and fastening hardware.
Solution Approach 2:
The patent changes the material parameter from metal to resin, utilizing the elastic properties of resin materials to achieve fixing firmness without requiring metal fasteners. The engagement protrusions are designed with appropriate elasticity to engage firmly with the columnar portion while being manufacturable as a single resin part.
3Reliability
If the columnar portion has a complicated shape, then the resin fixture can be firmly mounted, but the shape complexity increases
Solution Approach 1:
The patent applies local quality by creating engagement protrusions at specific locations on the resin fixture that engage with corresponding features on the columnar portion. Rather than requiring the entire columnar portion to have a complex shape, only localized engagement features are needed, allowing the majority of the columnar portion to maintain a simple plate-like shape.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables firm mounting of the resin fixture to the instrument panel without metal, reducing costs and simplifying the columnar portion's shape, while ensuring secure retention of the wire harness.
Implementation Method 1
a biting phenomenon in which the protrusion of the main inner wall face is pressed onto the main outer wall face is caused in the body portion based on a moment in which a fulcrum is a start end side
Implementation Method 2
based on a moment in which a fulcrum is a start end side, which is an opposite side to the placement portion side
Data Source
AI summary
Provided is a body portion that includes an insertion hole portion having an insertion hole as a long hole, and a placement portion which is adjacent to one side in an orthogonal direction of the insertion hole at an upper end side in the height direction of the body portion, and on which a long member can be placed. When an external force acts on the placement portion in the height direction, a biting phenomenon in which a protrusion of a main inner wall face of the body portion is pressed onto a main outer wall face of a columnar portion of the molded member is caused in the body portion based on a moment in which a fulcrum is a lower end side, in the height direction, which is an opposite side to the placement portion side, to prevent the body portion from being disengaged from the columnar portion.