Vehicle Door Frame Structure with Reinforcement Member
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Solution Overview
Problem
Conventional door structures face issues with deformation of reinforcement members during vehicle collisions, leading to inadequate door strength despite weight reduction efforts.
Innovation Solution
A door structure featuring an outer panel and an inner panel with a frame configuration, including longitudinal side portions, connecting members, and separate reinforcement members that form a closed cross-section, enhancing strength while maintaining weight reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a panel-shaped reinforcement member is used in the conventional door structure, then the door weight is reduced, but the reinforcement member deforms during vehicle collision resulting in insufficient door strength
Solution Approach 1:
The panel outer member is divided into multiple segments (front longitudinal side portion, rear longitudinal side portion, lower side portion, and connecting member) that are joined together to form a frame structure. This segmentation allows each part to contribute to overall structural strength while maintaining lightweight characteristics, resolving the contradiction between weight reduction and strength enhancement.
Solution Approach 2:
The door structure combines the frame-shaped panel outer member with a separate reinforcement member to create a composite structure. The frame provides structural integrity and load distribution, while the reinforcement member adds localized strength, together achieving both weight reduction and enhanced collision resistance.
2Ease of manufacture
If the reinforcement member is formed into a panel shape, then manufacturing is simplified, but the reinforcement member cannot sufficiently enhance door strength during collision
Solution Approach 1:
The panel outer member is segmented into multiple components that are joined to form a frame structure. This segmentation maintains manufacturing feasibility through standard joining processes while creating a structurally superior frame configuration that provides enhanced strength during collision compared to a solid panel design.
3Strength
If a frame-shaped panel outer member with separate reinforcement member is used, then door strength is enhanced, but the structure becomes more complex
Solution Approach 1:
The frame-shaped panel outer member and the reinforcement member are merged into an integrated structure where the reinforcement member is positioned within the frame. This combining approach achieves enhanced strength through the collaborative effect of both components while presenting a unified structural solution that manages complexity.
4Weight of moving object
If the conventional panel structure is used, then the door achieves weight reduction, but deformation occurs during collision due to insufficient strength
Solution Approach 1:
The door structure employs a composite configuration combining the frame-shaped panel outer member with a separate reinforcement member. This composite structure maintains lightweight properties while providing enhanced collision resistance through the synergistic effect of the frame geometry and reinforcement element, preventing deformation during impact.
Solution Approach 2:
The panel outer member is segmented into a frame structure with multiple joined portions, creating a lightweight yet strong configuration that resists deformation during collision while maintaining weight reduction benefits.
Data Source
AI summary
A door structure includes an outer panel and an inner panel. A panel outer member of the inner panel includes a front longitudinal side portion extending in an upper-lower direction at a front end portion of the panel outer member, a rear longitudinal side portion extending in the upper-lower direction at a rear end portion of the panel outer member, a lower side portion that joins a lower end portion of the front longitudinal side portion to a lower end portion of the rear longitudinal side portion, connecting members that connect the front longitudinal side portion to the rear longitudinal side portion in a front-rear direction, and reinforcement members provided separately from the connecting members and joined to the connecting members in such a way as to extend in the front-rear direction along the connecting members and to form closed cross-sections in spaces with the connecting members.