Deployable Door Reinforcement Assembly for Pillarless Vehicle Rigidity
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Solution Overview
Problem
Vehicles without a middle pillar (B-pillar) face challenges in maintaining structural rigidity and safety during impacts, as the door opening area lacks reinforcement, potentially compromising occupant safety and vehicle integrity.
Innovation Solution
A reinforcement assembly comprising a first and second member, rotatably connected to a base and deployable across the door opening, engages with a pyrotechnic actuator to move from an undeployed to a deployed position, interlocking to enhance structural rigidity and safety by occupying the traditional B-pillar space, and includes a spring-loaded lock for secure engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a vertical body-mounted pillar (B-pillar) is installed between the front and rear pillars, then structural rigidity and safety during impacts are improved, but occupant ingress and egress convenience deteriorates due to obstruction
Solution Approach 1:
The patent applies a deployable reinforcement assembly that transitions from a retracted state (allowing free door movement and occupant access) to an extended state (providing structural reinforcement during impact). The assembly includes movable members that can be positioned to fill the B-pillar gap when needed, transforming the static structure into a dynamic one that adapts to different operational requirements.
Solution Approach 2:
The reinforcement assembly is divided into multiple segments or members that can independently move and position themselves. This segmentation allows the reinforcement structure to be compact when retracted (not obstructing door operation) and effectively fill the B-pillar space when deployed, providing structural support without permanently blocking the door opening.
2Ease of operation
If a vertical body-mounted pillar (B-pillar) is removed to allow unobstructed ingress and egress, then occupant convenience is improved, but structural rigidity and safety during impacts deteriorate
Solution Approach 1:
The invention replaces the static B-pillar with a dynamic reinforcement assembly that remains retracted during normal operation (maintaining unobstructed access) and deploys only when structural reinforcement is needed. This dynamic approach preserves the benefits of pillarless design while mitigating the structural weaknesses.
Solution Approach 2:
The reinforcement assembly is pre-positioned in a retracted state that does not interfere with door operation or occupant access. The system is designed to deploy the reinforcement members into the B-pillar space only when triggered by impact conditions, performing the structural reinforcement action preliminarily prepared but not yet executed during normal operation.
3Strength
If a deployable reinforcement assembly is added to provide structural support, then structural rigidity is improved, but device complexity increases
Solution Approach 1:
The patent integrates the reinforcement assembly with existing vehicle structures, such as mounting the assembly to the door or body framework. By merging the reinforcement function with existing structural elements, the design reduces overall complexity compared to implementing a completely separate deployment system.
Solution Approach 2:
The reinforcement assembly incorporates self-actuating mechanisms that utilize forces generated during impact (such as spring expansion or gas pressure from deformation) to automatically deploy the reinforcement members. This self-service capability eliminates the need for complex external actuation systems, sensors, and control electronics that would otherwise be required to trigger deployment.
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
The reinforcement assembly effectively increases the structural rigidity of the vehicle body at the door opening area, enhancing safety by providing additional support during impacts and improving occupant ingress and egress convenience.
Implementation Method 1
engages with a pyrotechnic actuator to move from an undeployed to a deployed position
Implementation Method 2
includes a spring-loaded lock for secure engagement
Data Source
AI summary
An assembly includes a vehicle body including a door opening and a first member and a second member each supported by the vehicle body. The first member and the second member are rotatable relative to each other and relative to the vehicle body across the door opening from an undeployed position to deployed position. The first member and the second member engage each other in the deployed position.