B-Pillar Reinforcement with Variable Height Profile
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Solution Overview
Problem
Current B-pillar reinforcement components in motor vehicles have limitations in bending stiffness due to their construction depth, which affects their load-bearing capacity and weight efficiency.
Innovation Solution
A structural component for a motor vehicle body, specifically a B-pillar, is designed with a cold-formed outer panel, a hot-formed and hardened reinforcing profile, and an inner panel, where the reinforcing profile's maximum height exceeds the outer panel's height, particularly in the upper section, allowing direct abutment and fixation of flange portions for enhanced bending stiffness and reduced weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the construction depth of the B-pillar reinforcement is increased to achieve higher bending stiffness, then the load-bearing capacity improves, but the weight of the component increases
Solution Approach 1:
The patent employs a composite structure combining a thermoplastic reinforcing profile with foam material filling the cavity between inner and outer formed parts. This composite approach achieves high bending stiffness through the thermoplastic profile's geometric shape and the foam's structural support, while avoiding the need for excessive material quantity that would increase weight. The foam also distributes loads effectively, enhancing strength-to-weight ratio.
Solution Approach 2:
The reinforcing profile features variable wall thickness and strategically positioned flanges that concentrate material where bending moments are highest. The profile height and wall thickness are optimized locally along the B-pillar length to match the varying load requirements, achieving maximum stiffness with minimum material usage and thus reducing overall weight.
2Weight of moving object
If the profile height of the reinforcing profile is reduced to lower manufacturing costs and save weight, then the weight efficiency improves, but the bending stiffness decreases
Solution Approach 1:
The combination of thermoplastic profile with optimized geometry and foam material creates a composite structure where the foam compensates for reduced profile height. The foam fills the cavity to provide structural support and load distribution, maintaining bending stiffness even when the thermoplastic profile height is minimized for weight savings.
Solution Approach 2:
Instead of relying solely on increasing profile height in one dimension, the patent utilizes the third dimension by filling the internal cavity with foam material. This volumetric approach provides structural reinforcement and bending stiffness without increasing the external profile dimensions, enabling weight reduction while maintaining strength.
3Strength
If additional reinforcing components are added to increase bending stiffness, then the load-bearing capacity improves, but the device complexity and manufacturing costs increase
Solution Approach 1:
The patent merges the functions of multiple separate reinforcing elements into a single integrated thermoplastic profile with optimized geometry. The profile includes integrated flanges, variable wall thickness, and strategic geometric features that collectively provide the reinforcement previously requiring multiple separate components, thus reducing complexity while maintaining or improving bending stiffness.
Solution Approach 2:
The composite structure of thermoplastic profile combined with foam material creates a unified reinforcing system that replaces multiple discrete components. The foam-filled cavity works synergistically with the thermoplastic profile to achieve the required bending stiffness, eliminating the need for additional separate reinforcing elements and simplifying the overall structure.
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 design achieves higher bending stiffness with reduced profile height and sheet thickness, potentially eliminating additional reinforcing components, lowering manufacturing costs, and saving weight while maintaining or improving load-bearing capabilities.
Implementation Method 1
a hot-formed and hardened second formed part
Implementation Method 2
hot-formed and hardened second formed part
Implementation Method 3
a cold-formed first formed part
Data Source
AI summary
A structural component for a motor vehicle body comprises: an outer panel with an outer wall and two outer flange portions; an inner panel with an inner wall and two inner flange portions; a reinforcing profile with a profile base, two profile walls opposite one another and two connecting portions connected thereto; wherein, in an upper pillar section, a maximum profile height of the reinforcing profile is greater than a maximum profile height of the outer panel, wherein the connecting portions of the reinforcing profile are supported against the inner wall, and wherein the connecting portions of the reinforcing profile are supported against the inner wall, and wherein the outer flange portions and the inner flange portions directly abut one another and are fixed to one another, wherein the connecting portions of the reinforcing profile are fixed, at least in a lower section of the structural component, between the outer flange portions and the inner flange portions.