Vehicle Door Lightweight Plastic External Panel Steel Internal
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Solution Overview
Problem
Conventional vehicle doors are heavy due to steel materials, increasing weight and maintenance costs, and require complex replacement processes when damaged.
Innovation Solution
A vehicle door design featuring a lightweight plastic external panel, a metal internal panel, and a reinforcement member made of steel, with a reduced number of parts and simplified assembly to reduce weight, cost, and maintenance complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If steel material is used for door internal panel and door frame, then collision stability and structural rigidity are improved, but weight increases
Solution Approach 1:
The door structure combines steel material for the internal panel and frame with plastic material for the external panel, creating a composite structure that leverages the high strength of steel where needed while using lighter plastic for the outer covering, thereby reducing overall door weight while maintaining collision stability
Solution Approach 2:
The door is divided into separate components (internal panel, external panel, frame) that can be manufactured independently and assembled together, allowing optimization of each component's material selection based on its specific functional requirements
2Ease of manufacture
If door internal panel and door module are separately manufactured, then manufacturing flexibility is improved, but number of parts increases
Solution Approach 1:
The door module is integrated with the door internal panel and frame structure, combining multiple previously separate components into a unified assembly that reduces the total number of parts while maintaining manufacturing flexibility through modular design
3Stability of the object's composition
If door external panel is welded together with door panels as a whole, then structural integrity is improved, but maintenance cost increases
Solution Approach 1:
The door external panel is designed as a separate, detachable component from the door module, allowing it to be independently removed and replaced without affecting the structural integrity of the main door assembly, thereby reducing maintenance costs
4Weight of moving object
If lightweight material is used for door external panel, then weight is reduced, but structural rigidity may be compromised
Solution Approach 1:
The door structure combines steel material for the internal panel and frame with plastic material for the external panel, creating a composite structure that leverages the high strength of steel where needed while using lighter plastic for the outer covering, thereby reducing overall door weight while maintaining collision stability
Solution Approach 2:
Different parts of the door structure use different materials optimized for their specific functions: steel is used where strength and rigidity are critical (internal panel, frame), while plastic is used for the external panel where weight reduction is prioritized, achieving local optimization of material properties
Data Source
AI summary
A door of a vehicle may include a door internal panel; a door external panel mounted outside a passenger compartment with respect to the door internal panel, detachably coupled to the door internal panel, and made of a lightweight material than the door internal panel; and a reinforcement member mounted between the door external panel and the door internal panel and fastened to the door external panel and the door internal panel to increase rigidity, reducing weight and cost of the door of the vehicle and easily replacing the door external panel.