Vehicle Headrest Geometry for Travel Sickness Suppression
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Solution Overview
Problem
Existing vehicle seat designs require complex mechanisms to suppress occupant travel sickness, which can be exacerbated by the rocking motion of the head during vehicle acceleration, leading to discomfort and nausea.
Innovation Solution
A vehicle seat with a headrest and head support section that supports the occipital bone from the left-right direction and obliquely upward, providing increased contact pressure during acceleration to stabilize the head and reduce rocking motion, thus simplifying the configuration while effectively alleviating travel sickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex mechanism with drive devices is used to rotate headrest sections, then occupant travel sickness is suppressed, but device complexity increases
Solution Approach 1:
The invention extracts only the essential support function needed to suppress travel sickness, removing complex drive devices and rotation mechanisms. The head support section is designed with a specific geometry that provides the necessary support forces passively through its shape and positioning, eliminating the need for active mechanical systems.
Solution Approach 2:
The head support section is designed to automatically provide the required support function through its geometric configuration. The specific shape and positioning of the support section create the necessary contact points and force distribution to suppress head rocking during acceleration, without requiring external control systems or energy input.
2Stability of the object's composition
If the head support section is positioned to support the occipital bone, then head rocking is suppressed, but contact pressure distribution becomes uneven during acceleration
Solution Approach 1:
The head support section features locally optimized support surfaces positioned at specific locations to support the occipital bone and surrounding areas. The geometry is designed to create favorable pressure distribution at key contact points while maintaining overall head stability, with different regions of the support section providing different types of support.
Solution Approach 2:
The invention addresses pressure distribution by adding a dimensional aspect to the support geometry. The head support section extends in multiple directions with varying curvature and positioning, creating a three-dimensional support surface that distributes contact pressure more evenly across the occipital region during acceleration events.
Data Source
AI summary
A vehicle seat includes a seat cushion, a seatback, a headrest, and a head support section. The seat cushion is configured so as to support the buttocks of a seated occupant from a seat lower side. The seatback is configured so as to support the back of the seated occupant from a seat rear side. The headrest is configured so as to support the head of the seated occupant from the seat rear side. The head support section is provided to the headrest and is configured so as to support a location corresponding the occipital bone of the head of the seated occupant from a seat left-right direction, and is also configured so as to support the location in a forward direction and in a seat obliquely upward direction from the seat rear side.