Motor Vehicle Seat Backrest Fastening System
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Solution Overview
Problem
Existing motor vehicle rear seats with folding backrests face issues with secure fastening and energy absorption during collisions, as the loop-shaped holding devices can slip out of their through-openings under high forces, compromising safety and stability.
Innovation Solution
A motor vehicle seat design featuring a backrest with a loop-shaped and hook-shaped fastening system that engages in a form-fitting manner, utilizing a U-shaped profile and plate-shaped section with a transition area, ensuring secure assembly and deformation to maintain connection under force, combined with an energy absorption component for enhanced safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a loop-shaped holding device with a downwardly angled section is used to fasten the backrest, then the backrest can be securely attached to the body, but under high force the loop-shaped section deforms and slips out of the through-opening, compromising safety
Solution Approach 1:
The fastening system is divided into two distinct components: a loop-shaped fastening element on the backrest and a hook-shaped fastening element on the body. This segmentation allows each component to be optimized for its specific function - the loop provides form-fitting engagement while the hook provides secure anchoring, together resolving the contradiction between ease of attachment and collision resistance
Solution Approach 2:
The fastening elements are designed with specific local geometries - the loop-shaped element has a downwardly angled section that engages with the hook-shaped element's receiving structure. This local quality optimization ensures that under collision forces, the engagement geometry prevents slippage while maintaining the form-fitting connection, thereby improving both reliability and strength
2Reliability
If multiple interlocking mounting devices and through-openings are used on the backrest, then crash safety is improved, but the structure becomes more complex and heavier
Solution Approach 1:
Multiple fastening functions are merged into a single integrated fastening system. The loop-shaped and hook-shaped fastening elements combine form-fitting engagement, secure anchoring, and collision resistance in one unified mechanism, eliminating the need for separate mounting devices and through-openings while maintaining or improving crash safety
Solution Approach 2:
The fastening elements serve multiple functions simultaneously: they provide form-fitting attachment during normal use, enable secure anchoring under collision forces, and allow for controlled release when needed. This multi-functionality reduces the number of separate components needed, thereby simplifying the overall structure while maintaining reliability
3Reliability
If a complex fastening system with multiple components is used, then locking safety is improved, but assembly and disassembly procedures become more difficult
Solution Approach 1:
The loop-shaped and hook-shaped fastening elements are designed to self-align and self-engage during assembly. The form-fitting geometry allows the loop to naturally engage with the hook without requiring complex alignment procedures or multiple adjustment steps, thereby maintaining locking safety while significantly simplifying assembly and disassembly operations
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 design achieves high crash and locking safety, simplifies assembly and disassembly, reduces weight, and ensures the backrest remains securely attached to the vehicle body even under impact, enhancing overall safety and efficiency.
Implementation Method 1
The energy absorption element is arranged at a lower end of a respective backrest and has a corrugated profile which can be plastically deformed when the backrest is acted upon
Data Source
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AI summary
A seat for a motor vehicle is known that is connected to the frame by means of a transverse beam. The aim of the invention is to provide a seat for a motor vehicle comprising a simple construction. The aim is achieved in that the layer (19) for seating comfort in the backrest (4) is disposed on a structural component (20) so that a surface component (22) comprising an energy absorption component (58) connects to the structural component (20), and that the surface component (22) extends substantially over the back side (6) of the backrest (4), and that the backrest (4) is attached to components (10, 14) extending in the vehicle y direction by means of at least one upper bearing (28, 33) and at least one lower attachment (13).