Vehicle Shutter Storage Box Surface Structure for Heat Stress Relief
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Solution Overview
Problem
Shutter-type storage boxes for vehicles face issues with unevenness and deterioration of the decorative surface due to residual stress in the plastic film covering when exposed to high temperatures, leading to a compromised appearance.
Innovation Solution
A shutter-type storage box design featuring a three-dimensional knitted fabric cushion layer and a plastic film covering layer, where the cushion layer absorbs stress through changes in yarn distances and angles, reducing residual stress and deformation, and maintaining flexibility and heat resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a plastic film is used as the covering layer, then design flexibility for decorative surface is improved, but unevenness occurs on the decorative surface under high temperature conditions
Solution Approach 1:
The patent uses a composite structure consisting of a plastic film covering layer and a three-dimensional knitted fabric cushion layer. The plastic film provides design flexibility and decorative surface, while the three-dimensional knitted fabric cushion layer absorbs thermal stress and prevents unevenness on the plastic film surface under high temperature conditions.
Solution Approach 2:
The patent changes the material parameter of the cushion layer from traditional urethane foam plastic to three-dimensional knitted fabric. This material parameter change enables the cushion layer to better absorb and distribute thermal stress, preventing stress concentration that would cause plastic film deformation and surface unevenness.
2Reliability
If the shutter is bent during hot conditions, then stress accumulates in the plastic film, but using traditional cushion materials does not sufficiently reduce this stress
Solution Approach 1:
The three-dimensional knitted fabric structure inherently possesses a porous, flexible network that can expand and contract to absorb thermal stress. This porous structure allows the material to deform elastically under heat, preventing stress concentration in the plastic film covering layer.
Solution Approach 2:
The three-dimensional knitted fabric cushion layer acts as an intermediary between the shutter main body and the plastic film covering layer. It mediates the thermal stress by absorbing and distributing it through its flexible structure, protecting the plastic film from direct stress exposure.
3Ease of operation
If the cushion layer becomes too soft to improve flexibility, then structural support is compromised, but if too hard, then tactile impression deteriorates
Solution Approach 1:
The patent changes the physical parameters of the cushion layer by using three-dimensional knitted fabric with specific yarn arrangements and densities. This material selection provides optimal balance between softness for flexibility and structural integrity for support, eliminating the need to choose between conflicting properties.
Solution Approach 2:
The combination of three-dimensional knitted fabric and plastic film creates a composite cushion layer that integrates the flexibility of the knitted fabric with the structural support and surface finish of the plastic film, achieving both ease of operation and structural strength.
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 design enhances the flexibility of the decorative surface while improving heat resistance, allowing for easier opening and closing of the shutter and preventing excessive softness or hardness of the cushion layer, thus maintaining a consistent tactile impression and appearance.
Implementation Method 1
The cushion layer is a three-dimensional knitted fabric... the cushion layer absorbs stress through changes in yarn distances and angles
Data Source
AI summary
A shutter-type storage box for a vehicle includes a box main body including an opening, a shutter configured to open and close the opening, a shutter housing, and two guide grooves. The shutter housing is provided adjacent to the box main body and is configured to house the shutter in a bent state. The guide grooves are located on opposite sides of the shutter in a width direction and guide movement of the shutter. The shutter includes a shutter main body configured to bend, a cushion layer provided on a surface of the shutter main body, and a covering layer provided on a surface of the cushion layer. The cushion layer is a three-dimensional knitted fabric. The covering layer includes a plastic film.