Vehicle Door Panel Fastening Structure for Thermal Expansion Relief
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Solution Overview
Problem
In vehicle door manufacturing, the use of different materials for external and internal panels leads to thermal deformation issues, causing interference with the vehicle body and increasing production costs due to the need for frequent mold changes and design adjustments in small-quantity production models.
Innovation Solution
A panel fastening structure and method where one side of the door is hinged with a fastening member and the other side is slidably coupled, using a combination of plastic and metal panels with specific fastening and reinforcement features to maintain a consistent parting gap and absorb thermal expansion, preventing interference with the vehicle body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If plastic panels are used for external and internal panels to reduce mold investment cost and improve design responsiveness, then production cost and development period are reduced, but thermal deformation occurs causing door interference with vehicle body
Solution Approach 1:
The patent employs a composite structure combining plastic external panels with metal internal panels and reinforcement members. This composite approach allows the plastic external panel to achieve design flexibility and cost reduction, while the metal internal panel and reinforcement members provide structural strength and thermal stability to prevent door interference with the vehicle body.
Solution Approach 2:
The patent applies local quality by using different materials in different regions of the door structure. The external panel uses plastic for aesthetic and cost reasons, while the internal panel and specific reinforcement zones use metal to provide localized thermal stability and structural support where needed to prevent interference.
2Reliability
If metal panels are used for both external and internal panels to maintain thermal expansion consistency, then door interference is prevented, but mold investment cost and development period increase
Solution Approach 1:
Instead of using uniform metal panels throughout, the patent creates a composite structure where metal internal panels and reinforcement members are strategically positioned to provide thermal stability only where necessary, while plastic external panels are used in regions where cost reduction and design flexibility are priorities.
Solution Approach 2:
The patent changes material parameters (from uniform metal to plastic-metal composite) and structural parameters (adding reinforcement members) to achieve the desired thermal expansion characteristics. The reinforcement members are specifically designed to compensate for the different thermal expansion coefficients of plastic and metal materials.
3Adaptability or versatility
If diversified small-quantity production vehicle models are developed with plastic panels, then mold investment cost is reduced, but thermal deformation difference between plastic and metal panels causes door interference
Solution Approach 1:
The patent creates a hybrid door structure combining plastic external panels with metal internal panels and reinforcement members. This composite construction enables rapid design changes and model diversification through plastic panel variations while the metal components maintain consistent thermal performance across different vehicle models.
Solution Approach 2:
The metal internal panel and reinforcement member structure serves as a universal base that can accommodate different plastic external panel designs. This multi-functional framework provides thermal stability and structural support across multiple vehicle models, allowing design responsiveness without sacrificing reliability.
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
This solution allows for smooth coupling of panels with different materials, maintaining a consistent hinge connection and preventing door interference due to thermal deformation, thereby reducing production costs and improving design responsiveness.
Implementation Method 1
the external panel 111 and the internal panel 112 thermally expand together even in a high-temperature environment such as a hot summer season
Data Source
AI summary
A panel fastening structure of the panel door for a vehicle to which circumferences of an external panel and an internal panel are coupled, wherein a first side of the door hinged to a vehicle body includes the external panel and the internal panel fastened by a fastening member, and a second side of the door includes the external panel and the internal panel slidably coupled to each other.