Vehicle Seat Deformation Brackets for Rear Impact Energy Management
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Solution Overview
Problem
Existing vehicle seat assemblies fail to effectively manage energy during rear impact conditions, as the head restraint is directly attached to the seatback frame, leading to acceleration of the seatback into the occupant, which can cause injury.
Innovation Solution
The vehicle seat assembly incorporates deformation brackets with a primary substrate, sidewalls, upper and intermediate flanges, and a secondary substrate that are designed to deform upon impact, allowing the head restraint to translate towards the seatback frame, dissipating impact forces and reducing the risk of whiplash.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the head restraint is directly attached to the seatback frame, then the structure is simple and strong, but the impact energy cannot be effectively managed during rear impact conditions
Solution Approach 1:
The direct attachment between head restraint and seatback frame is segmented by introducing deformation brackets as intermediate components. The bracket is divided into multiple functional regions (first region for mounting, second region for deformation, third region for support) that separately handle different aspects of impact energy management, transforming a single rigid connection into a controlled deformation system.
Solution Approach 2:
The deformation bracket is designed with predetermined deformation characteristics that activate during rear impact conditions. The bracket's geometry and material properties are configured in advance to absorb and dissipate impact energy through controlled deformation, providing cushioning protection before the full impact force reaches the occupant.
2Reliability
If the bracket is designed to deform upon impact, then impact forces are dissipated, but the bracket must be precisely engineered to meet deformation limits
Solution Approach 1:
The bracket's deformation characteristics are controlled by adjusting geometric parameters (thickness, length, cross-sectional dimensions) and material properties. These parameters are optimized to ensure the bracket deforms within specified limits during impact while maintaining sufficient strength during normal use, balancing energy absorption with structural integrity.
Solution Approach 2:
Different regions of the bracket are designed with different structural properties. The first region has higher strength for mounting, the second region is optimized for deformation and energy absorption, and the third region provides support. This local differentiation allows precise control over where and how deformation occurs, meeting both safety and manufacturing requirements.
3Reliability
If the bracket structure is optimized for energy absorption, then occupant protection is improved, but the overall seat assembly weight increases
Solution Approach 1:
The deformation bracket utilizes thin-walled structural design with optimized cross-sections that provide sufficient deformation capacity and energy absorption while minimizing material usage. The bracket's geometry is designed to achieve high strength-to-weight ratio, allowing effective impact protection with reduced mass compared to traditional rigid bracket designs.
Solution Approach 2:
The bracket may utilize composite material structures or hybrid construction methods combining different materials with complementary properties. This allows the bracket to achieve both the required deformation characteristics for energy absorption and the strength for structural support while keeping weight minimal through material optimization.
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 deformation brackets absorb and dissipate impact forces, reducing the risk of injury by managing energy transfer during rear impacts and optimizing deceleration of the head restraint, while also allowing for weight reduction and meeting deformation limits.
Implementation Method 1
the second bracket deforms as the at least one head restraint post is translated toward the seatback frame
Implementation Method 2
dissipating impact forces and reducing the risk of whiplash
Data Source
AI summary
A vehicle seat assembly is provided with a seatback frame adapted to be mounted to a vehicle interior. The seatback frame has a front region facing a forward direction, and a rear region. A first bracket is mounted to the front region of the seatback frame. A second bracket is mounted to the first bracket and the rear region of the seatback frame. At least one head restraint post is mounted to the first bracket or the second bracket and spaced apart from the seatback frame so that upon a rear vehicle impact, the second bracket deforms as the at least one head restraint post is translated toward the seatback frame.