Liftgate Bulkhead Reinforcement Structure Without Added Parts
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Solution Overview
Problem
Liftgates and other vehicle closures often lack adequate structure between inner and outer panels, failing to meet performance requirements without increasing part count, cost, and weight by adding extra reinforcements.
Innovation Solution
Integrating molded-in bulkhead ribs into vehicle parts, such as liftgates, to provide structural reinforcement without additional components, using adhesive or welding for connection between panels.
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 and part count increase
Solution Approach 1:
The patent integrates the reinforcement ribs directly into the inner panel structure during the molding process, merging the reinforcement function with the existing panel rather than adding separate reinforcement components. This eliminates the need for additional parts while maintaining structural strength.
Solution Approach 2:
The inner panel serves multiple functions: it provides the basic panel structure and simultaneously incorporates reinforcement ribs that strengthen the liftgate assembly. This multi-functionality eliminates the need for separate reinforcement components.
2Strength
If additional reinforcement panels and fasteners are added, then structural integrity is improved, but assembly time and labor cost increase
Solution Approach 1:
The reinforcement ribs are molded as an integral part of the inner panel in a single manufacturing step, combining what would traditionally require multiple separate components and assembly operations into one unified part.
Solution Approach 2:
The reinforcement structure is pre-formed during the molding process itself, preparing the structural strength before assembly occurs. This eliminates the need for additional assembly steps to install separate reinforcement components.
3Strength
If extra steel panels are added for reinforcement, then performance requirements are met, but added mass increases
Solution Approach 1:
The patent uses a composite structure where the inner panel material (such as thermoplastic) is molded to include integrated reinforcement ribs, creating a composite-like structure that provides enhanced strength without the weight penalty of adding separate steel reinforcement panels.
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.