Side Door Reinforcement and Foam Damping for Side-Impact Intrusion
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Solution Overview
Problem
Existing side doors in motor vehicles face challenges in absorbing energy during side impacts, leading to increased intrusions and potential overload of joint connections, and require costly, model-specific adaptations for different crash requirements.
Innovation Solution
A side door design featuring a reinforcement element with two deformation regions and an impact damper, where the upper deformation region overlaps the barrier's smaller portion and the lower region overlaps the side sill, supported by a foam part to prevent the door from being pulled over the sill during a collision, using cost-effective materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a reinforcement element is used to support the side door on the side sill, then the side door stability is improved, but the side door can still be pulled over the side sill in severe side impacts
Solution Approach 1:
The reinforcement element is divided into multiple segments or zones with different deformation characteristics. The lower portion engages with the side sill to prevent door displacement, while the upper portion provides energy absorption through controlled deformation, creating a segmented defense mechanism against side impacts
Solution Approach 2:
The reinforcement element's geometric parameters are optimized to change during impact - the deformation regions are designed to progressively collapse or deform under load, transforming the rigid support structure into a energy-absorbing mechanism that maintains door stability while preventing over-pulling
2Reliability
If an extruded profile reinforcement element is used, then the side impact protection is improved, but the manufacturing cost increases and model-specific adaptations are required
Solution Approach 1:
The reinforcement element is designed with universal geometric features and standardized connection interfaces that can be applied across different vehicle models. The deformation regions are configured to work effectively with various side sill designs, eliminating the need for model-specific customization while maintaining protection performance
Solution Approach 2:
The reinforcement element uses cost-effective materials and simple geometric forms that can be manufactured through conventional processes. The design accepts controlled deformation during impact, using inexpensive materials strategically positioned to provide maximum protection at minimum cost
3Loss of energy
If deformation regions are added to the reinforcement element, then the energy absorption capability is improved, but the device complexity increases
Solution Approach 1:
The deformation regions incorporate curved or rounded geometric features that naturally promote controlled collapse during impact. These curved profiles guide the deformation progression without requiring complex internal structures, achieving energy absorption through simple geometric design
Solution Approach 2:
The reinforcement element uses thin-walled structural sections that are designed to buckle or deform in a controlled manner during impact. These flexible thin-walled structures absorb energy through progressive collapse while maintaining simplicity in overall design
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 design effectively absorbs energy and prevents the side door from being pulled over the side sill, maintaining structural integrity while being cost-effective and adaptable to various crash requirements.
Implementation Method 1
an impact damper formed as a foam part is provided inside the side door between the reinforcement element and the side sill
Data Source
AI summary
A motor vehicle includes a body that has a doorway. A side door is moveably held on the doorway and displaceable between a closed position and an open position. The side door has an inner door part, a reinforcement element, and a planking element. The reinforcement element has an upper deformation region and a lower deformation region. An impact damper that is a foam part is disposed inside the side door between the reinforcement element and the inner door part. The impact damper extends over at least a partial length of the reinforcement element and substantially completely fills a cavity delimited between the reinforcement element and the inner door part.