Vehicle Seat Head Restraint with Pneumatic Impact Damping
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Solution Overview
Problem
Existing head restraints in vehicles fail to provide secure and reliable damping of head impacts during collisions while being cost-effective and simple to produce and mount.
Innovation Solution
A head restraint system comprising a base element, connecting element, bearing element, and damping device with a cylinder and piston, where the damping device is designed to absorb impact energy by decoupling damping from depth adjustment, using an air chamber and overpressure valves to control damping activation only during impact, and featuring a web element for force transmission and irreversible deformation to prevent ricochet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If damping is integrated into the depth adjustment mechanism, then the structure is simplified, but the damping cannot be decoupled from adjustment operations causing unnecessary damping activation
Solution Approach 1:
The head restraint is segmented into two independent systems: a depth adjustment mechanism for positioning and a separate damping device for impact absorption. The damping device includes a piston-cylinder assembly with an air chamber that operates independently from the adjustment mechanism, allowing damping to be activated only during impacts rather than during normal adjustment operations.
2Reliability
If damping device is added to absorb impact energy, then head impact damping is improved, but device complexity and production cost increase
Solution Approach 1:
The damping device utilizes a pneumatic system consisting of a piston, cylinder, and air chamber. During normal operation, the air chamber provides minimal resistance. Upon impact, the sudden compression of air in the chamber creates damping force to absorb impact energy. This pneumatic approach provides effective impact damping without requiring complex mechanical structures or expensive materials.
3Reliability
If damping is always active, then head impact protection is improved, but unnecessary damping occurs during normal operation reducing ease of operation
Solution Approach 1:
The damping device is designed to be dynamically activated based on operational conditions. The piston-cylinder arrangement with air chamber provides variable resistance: minimal damping during normal slow movements for ease of operation, and high damping during sudden impacts for protection. The system automatically adjusts its damping characteristic based on the speed and force of the 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 system effectively absorbs and dissipates impact energy, ensuring secure head restraint functionality during collisions without unnecessary damping activation during normal operation, thus enhancing safety and simplicity in production and use.
Implementation Method 1
An air chamber is thus defined by the cylinder and the piston. The air chamber advantageously serves as a damping element in order thereby to damp a movement between the holding element and bearing element.
Implementation Method 2
Energy can be absorbed such that impact energy of the head on the head restraint is reduced.
Data Source
AI summary
A head restraint of a vehicle seat includes a base element, at least one connection element positioned on the base element for connecting the base element to a backrest of a vehicle seat, a bearing element having a contact surface for contacting a head of a user of the vehicle seat, and a holding element which can be adjusted along a depth axis relative to the base element. The depth axis is oriented perpendicular to the contact surface. The bearing element is connected to the holding element by a damping device, wherein the damping device damps a movement of the bearing element relative to the holding element.