Vehicle Headrest with Score Lines for Impact Energy Management
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Solution Overview
Problem
Existing headrest designs in vehicles lack effective energy absorption during dynamic events, such as collisions, as they do not adequately manage impact energy, leading to potential harm to occupants.
Innovation Solution
A headrest assembly with contoured trim components and score lines on the rear and back panels, which are designed to deflect and absorb energy by creating specific deflection points and channels, allowing for controlled deformation and energy dissipation during impacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the headrest assembly is made rigid to maintain structural integrity, then strength is improved, but energy absorption capability deteriorates
Solution Approach 1:
The headrest assembly is divided into multiple segments including the headrest housing, back panel, and trim components, each with defined deflection zones. The score lines create segmented regions that can deflect independently while maintaining overall structural integrity, allowing energy absorption through controlled segment movement rather than rigid monolithic structure.
Solution Approach 2:
The patent utilizes parameter changes by incorporating score lines that alter the structural parameters of the headrest components. These score lines create regions with modified stiffness characteristics, allowing the assembly to transition between rigid and flexible states during impact events, thereby achieving both strength and energy absorption.
2Loss of energy
If the headrest assembly is made flexible to absorb energy, then energy absorption is improved, but structural integrity deteriorates
Solution Approach 1:
The headrest assembly is divided into multiple segments including the headrest housing, back panel, and trim components, each with defined deflection zones. The score lines create segmented regions that can deflect independently while maintaining overall structural integrity, allowing energy absorption through controlled segment movement rather than rigid monolithic structure.
Solution Approach 2:
The patent utilizes parameter changes by incorporating score lines that alter the structural parameters of the headrest components. These score lines create regions with modified stiffness characteristics, allowing the assembly to transition between rigid and flexible states during impact events, thereby achieving both strength and energy absorption.
3Loss of energy
If score lines are added to create deflection zones, then energy dissipation is improved, but manufacturing complexity deteriorates
Solution Approach 1:
The score lines are integrated directly into the molded trim components and housing structures, merging the deflection zone creation with the existing manufacturing processes. This approach combines multiple functions (structural support, energy absorption, and aesthetic trim) into single integrated components, reducing overall manufacturing complexity despite adding energy dissipation capabilities.
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 headrest assembly effectively absorbs and dissipates impact energy, reducing the force transmitted to occupants by allowing localized and controlled breakage at specific points, thereby enhancing safety during dynamic events.
Implementation Method 1
score lines disposed on the inner surface to define a deflectable lower portion of the panel
Implementation Method 2
The headrest assembly effectively absorbs and dissipates impact energy, reducing the force transmitted to occupants
Data Source
AI summary
A vehicle seat includes a seatback with a back panel having a plurality of score lines defining a deflectable upper portion of the back panel. A headrest includes a housing with front and rear covers. The rear cover includes a plurality of score lines defining a deflectable lower portion of the rear cover. A trim ring is coupled between the deflectable upper portion of the seatback and the deflectable lower portion of the rear cover by one or more reinforcement brackets in assembly. The trim ring includes a plurality of notches disposed along a perimeter portion thereof. The notches of the trim ring cooperate to define deflection points of the trim ring along the perimeter thereof. The score lines and the notches of the vehicle seat provide for a dynamic impact energy management system for the seat at a head restraint thereof.