Vehicle Seat Side Panel Deformation Zone Design
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Solution Overview
Problem
Vehicle seat side panels face structural instability and risk of material destruction during crashes due to high crash forces, particularly from seat belts, which can lead to unwanted sharp edges that may cut into the belt section.
Innovation Solution
Incorporating predetermined breaking points, such as linear indentations, in critical regions of the side panel to control and direct the breakage during a crash, ensuring the fracture edges face away from the occupant and avoid cutting into the lap belt section.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the side panel is reinforced to improve structural stability, then strength increases, but weight and complexity increase
Solution Approach 1:
The side panel is segmented into a deformation zone and a stable zone, allowing different structural characteristics in different regions. The deformation zone is designed to fail controllably while the stable zone maintains structural integrity, resolving the contradiction between overall strength and localized flexibility.
Solution Approach 2:
The material parameters of the side panel are changed by creating a deformation zone with modified structural properties (reduced stiffness) compared to the stable zone. This parameter differentiation allows the panel to absorb crash forces through controlled deformation while maintaining overall structural stability.
2Reliability
If the side panel is made more stable, then reliability improves, but the ability to absorb crash forces through controlled breakage decreases
Solution Approach 1:
A predetermined breaking point is created in advance within the deformation zone, establishing a predefined failure path before the crash occurs. This preliminary action ensures that when crash forces exceed the panel's strength, the breakage occurs at the predetermined location rather than randomly, maintaining reliability while enabling controlled energy absorption.
Solution Approach 2:
The potential harm of panel breakage during crash is converted into a beneficial controlled failure mechanism. The predetermined breaking point transforms what would be a harmful random fracture into a useful controlled breakage that absorbs crash forces while preventing dangerous sharp edges, thus converting the harmful effect into a protective function.
3Use of energy by moving object
If the predetermined breaking point is positioned to absorb forces, then crash force absorption improves, but the risk of sharp edges cutting into the belt increases
Solution Approach 1:
Different regions of the side panel are assigned different local qualities: the deformation zone contains the predetermined breaking point for force absorption, while the stable zone maintains structural integrity. The breaking point is specifically designed with geometry that ensures fracture surfaces orient away from the seat belt, locally eliminating the sharp edge hazard while preserving force absorption capability.
Solution Approach 2:
The potential harm of sharp edges created during breakage is converted into a benefit by designing the predetermined breaking point geometry such that the fracture surfaces naturally orient away from the seat belt. This converts what would be a harmful sharp edge into a safe fracture pattern that still absorbs crash forces effectively.
Data Source
AI summary
A vehicle seat is provided with a seat-mounted cover that includes a side panel. Provision is made that at least one predetermined breaking point is formed, at least in a critical region of the side panel in which a high crash force acts in the event of a possible crash.