Liftgate Bulkhead Rib Structure for Lower-Cost Reinforcement
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Solution Overview
Problem
Liftgates and other vehicle closures often lack adequate structure between inner and outer panels, leading to performance issues that are costly to address with additional reinforcements, increasing investment, part count, labor, and mass while introducing variability and potential defects like buzz, squeak, and rattle.
Innovation Solution
Integrating molded-in bulkhead ribs into vehicle parts, such as liftgates, to provide structural reinforcement without adding extra components, using adhesive or welding for connection, thus enhancing performance without increasing costs or weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If additional steel or plastic reinforcements are added to the liftgate structure, then structural strength is improved, but manufacturing cost increases
Solution Approach 1:
The patent combines the reinforcement function with the existing inner or outer panel by integrating bulkhead ribs directly into the molded panel structure. This merging eliminates the need for separate reinforcement components while maintaining structural strength, thereby reducing manufacturing cost and simplifying production.
Solution Approach 2:
The bulkhead ribs serve multiple functions: they provide structural reinforcement, act as attachment points for the opposite panel, and are integrated into the panel design itself. This multi-functionality eliminates the need for dedicated reinforcement parts, reducing overall manufacturing complexity and cost.
2Strength
If additional steel or plastic reinforcements are added to the liftgate structure, then structural strength is improved, but part count increases
Solution Approach 1:
The reinforcement features are merged with the panel design, so that the inner or outer panel itself provides the reinforcement function through integrated bulkhead ribs. This eliminates separate reinforcement parts and reduces overall part count while maintaining structural integrity.
3Strength
If additional steel or plastic reinforcements are added to the liftgate structure, then structural strength is improved, but assembly time increases
Solution Approach 1:
The bulkhead ribs are pre-formed as integral features of the molded panel during the manufacturing process. This preliminary action means that when panels are assembled, the reinforcement structure is already in place, eliminating the need for separate reinforcement installation steps and reducing assembly time.
4Strength
If additional steel or plastic reinforcements are added to the liftgate structure, then structural strength is improved, but mass increases
Solution Approach 1:
Instead of adding universal reinforcement across the entire liftgate structure, the patent applies localized bulkhead ribs only at specific areas where structural support is needed. This local quality approach provides necessary strength while minimizing additional material usage and mass increase.
5Strength
If additional steel or plastic reinforcements are added to the liftgate structure, then structural strength is improved, but build variation increases
Solution Approach 1:
By merging the reinforcement features into the molded panel design, the patent ensures that reinforcement geometry is defined by the mold rather than by separate components. This integration reduces build variation because the reinforcement features are consistently formed during molding without requiring additional assembly steps that could introduce variability.
6Strength
If additional steel or plastic reinforcements are added to the liftgate structure, then structural strength is improved, but potential for misbuilds increases
Solution Approach 1:
The integration of bulkhead ribs into the molded panel eliminates separate reinforcement components that could be incorrectly assembled or positioned. With the reinforcement features built into the panel itself, there is no risk of misbuilding reinforcement attachments, thereby improving reliability and reducing potential for assembly errors.
7Strength
If additional steel or plastic reinforcements are added to the liftgate structure, then structural strength is improved, but buzz squeak and rattle increase
Solution Approach 1:
By integrating the reinforcement features directly into the panel design with proper attachment points for the opposite panel, the patent creates a more rigid and stable assembly. This reduces loose fittings and potential sources of vibration-induced noise such as buzz, squeak, and rattle that can occur with separately attached reinforcement components.
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 approach enhances structural integrity and performance by eliminating the need for additional parts, reducing material and labor costs, and minimizing assembly time while maintaining or reducing weight, thus addressing performance and cost concerns.
Implementation Method 1
integrating at least one predetermined reinforcement (rib, a plurality of bulkhead ribs, etc.) in at least one predetermined location into at least one inner panel or at least one outer panel of the part
Data Source
AI summary
A liftgate integrating bulkhead reinforcements into an inner panel and/or outer panel of the liftgate or closure creating an efficient design that adds mold-in reinforcement structure and eliminates the need to add steel or plastic parts to meet performance requirements.