Vehicle Back Door Reinforcing Rib Configuration for Rigidity
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Solution Overview
Problem
Existing vehicle back doors face deformation issues in the lower half portion due to lack of rigidity, leading to weight increase and aesthetic problems when metal reinforcing members are used for reinforcement.
Innovation Solution
The implementation of a pair of reinforcing ribs on the door inner panel, spaced along the vehicle width below the hinge attachment locations, connecting an annular outer wall with a protruding inner wall, and featuring a rigid L-shaped end to enhance rigidity and reduce deformation, while being integrated with the door inner panel and bonded to the outer panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a metal reinforcing member is mounted on the inner panel to secure rigidity and reduce deformation, then the deformation of the lower half portion is reduced, but the weight of the back door increases
Solution Approach 1:
The invention extracts the reinforcing function from a separate metal component and integrates it directly into the resin inner panel through molded-in reinforcing ribs. This eliminates the need for additional metal reinforcing members while maintaining the rigidity enhancement effect, thereby reducing overall weight.
Solution Approach 2:
The invention uses a composite structure where resin material with high rigidity is combined with strategically positioned reinforcing ribs within the inner panel. This composite approach allows the resin panel itself to provide reinforcement, replacing traditional metal reinforcements and achieving weight reduction while maintaining structural stability.
2Stability of the object's composition
If a metal reinforcing member is mounted on the inner panel to secure rigidity, then the deformation is reduced, but the mounting process becomes inconvenient and complex
Solution Approach 1:
The invention merges the reinforcing ribs with the inner panel as an integrated unit through molding. The reinforcing ribs are formed directly within the resin material during the panel manufacturing process, eliminating separate mounting steps and simplifying production while ensuring consistent structural reinforcement.
Solution Approach 2:
The reinforcing ribs are prepared and positioned within the inner panel during the molding process itself, before assembly with the outer panel. This preliminary integration ensures the reinforcing structure is already in place and properly positioned, eliminating subsequent mounting operations and reducing manufacturing complexity.
3Stability of the object's composition
If the lower half portion of the back door is reinforced with metal members, then the deformation is reduced, but the appearance may be affected and unnecessary weight is added
Solution Approach 1:
The invention applies reinforcing ribs only in specific locations within the resin inner panel where structural support is most needed, rather than using uniform metal reinforcement throughout. This localized approach provides necessary rigidity enhancement while maintaining the overall aesthetic appearance and avoiding unnecessary weight addition.
Data Source
AI summary
A right reinforcing rib 25 is disposed on a straight line connecting a left hinge attachment location 15 with an inner wall 17 in a region surrounded by a left hinge attachment location 15, a right end of a lower edge of a door inner panel 3, and a right virtual corner 26a. A left reinforcing rib 25 is disposed on a straight line connecting a right hinge attachment location 15 with the inner wall 17 in a region surrounded by a right hinge attachment location 15, a left end of the lower edge of the door inner panel 3, and a left virtual corner 26b.