Vehicle Headrest Rotary Link Forward Motion
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Solution Overview
Problem
In vehicle rear collisions, the headrest's tilt mechanism increases the time it takes to support the occupant's head due to its complex structure and weight, as the seat back tilts rearward, moving the headrest further away from the occupant.
Innovation Solution
A headrest system with a blower and a rotation direction change member, such as a rotary link, is integrated with the seat back, allowing the headrest to rotate forward oppositely to the seat back during a collision, reducing the time to contact the occupant's head by utilizing a guide hole and cushioning pad to restrict the tilt angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a tilt mechanism is applied to the headrest, then the headrest can adjust its position, but the structure becomes complicated and the weight increases
Solution Approach 1:
Instead of tilting the headrest backward with the seat back during collision, the patent inverts the motion by using a rotary link mechanism that causes the headrest to move forward relative to the seat back, counteracting the natural inertial movement and reducing contact time
Solution Approach 2:
The patent employs a dynamic rotary link mechanism that allows the headrest to rotate in response to collision forces, transitioning from a static position to an active forward-moving position during rearward collision to improve protective response time
2Stability of the object's composition
If the seat back tilts rearward by inertia during rear collision, then the seat back moves backward, but the headrest becomes further from the occupant increasing contact time
Solution Approach 1:
The rotary link mechanism is pre-configured to generate forward motion of the headrest that counteracts the rearward inertial movement of the seat back, creating an opposing action that reduces the distance between headrest and occupant during collision
Solution Approach 2:
The rotary link acts as an intermediary mechanism between the seat back and headrest, transmitting and transforming the collision forces to produce the desired forward motion of the headrest independent of the seat back's rearward movement
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 system quickly supports the occupant's head during a rear collision, reducing injury by shortening the time to contact and adhering to collision regulations.
Implementation Method 1
because the seat back on which the headrest is installed is tilted toward a rear side of the vehicle by inertia in the event of a rear collision
Data Source
AI summary
A headrest for a vehicle with improved collision performance includes: a headrest stay provided integrally with a seat back and exposed at an upper end of the seat back; a blower connected to the headrest stay; and a rotation direction change member installed between the headrest stay and the blower, connecting the headrest stay and the blower, and configured to allow a rotation direction of the headrest stay and a rotation direction of the blower to be opposite to each other in an event of a rear collision.