Vehicle Seat Lumbar Support Wire Notch Against Collision Detachment
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Solution Overview
Problem
Existing vehicle seats with lumbar supports face issues where the wires supporting the lumbar support can come loose from the back frame during a rear-end collision, posing a risk of detachment.
Innovation Solution
A vehicle seat design that includes a notch formed on the wire, anchored at the edge of the insertion portion, and optionally a bushing to secure the wire to the back frame, preventing detachment by anchoring the notch at the edge or breaking the bushing under excessive force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the wire is simply inserted into the insertion portion without additional anchoring features, then the insertion process is simple and workability is improved, but the wire can come loose from the back frame during rear-end collision
Solution Approach 1:
The wire is designed with a notch at a specific location (local area) that creates an anchoring effect at the insertion portion. This localized feature provides enhanced reliability only where needed (at the insertion portion) without complicating the entire wire structure or insertion process
Solution Approach 2:
The notch is pre-formed on the wire before insertion. This preliminary action ensures that when the wire is inserted into the insertion portion, the notch automatically engages with the edge of the insertion portion, preventing loosening during collision without requiring additional anchoring steps
2Reliability
If a bushing is added to the insertion portion to prevent wire loosening, then the wire anchoring reliability is improved, but the device complexity and manufacturing complexity increase
Solution Approach 1:
A bushing is introduced as an intermediary component between the wire and the back frame. The bushing is attached to the insertion portion and works together with the wire's notch to prevent loosening during collision, distributing forces and enhancing reliability without requiring complex integration
3Reliability
If the wire is made longer to ensure sufficient insertion depth, then the anchoring reliability is improved, but the wire protrusion increases and space is wasted
Solution Approach 1:
The notch is pre-formed at a specific position on the wire, allowing the wire to be inserted to an optimal depth. The notch engages with the edge of the insertion portion to prevent loosening, eliminating the need for excessive wire length while maintaining reliability
Solution Approach 2:
The anchoring function is concentrated at the notch location near the insertion portion, providing reliable anchoring without requiring the entire wire to be excessively long. This localized anchoring reduces wire protrusion and space occupation
Data Source
AI summary
A vehicle seat includes a seatback that supports a back of a seated occupant from a seat rear side, a back frame that configures a framework of the seatback and that includes an insertion portion, and a lumbar support that is arranged at a position facing a lumbar region of the seated occupant in a seat front-rear direction within the seatback. The vehicle seat includes a wire that extends from the lumbar support toward an insertion portion side and that is anchored at the insertion portion in a state of being inserted into the insertion portion. A notch that is directly or indirectly anchored at an edge of the insertion portion when the lumbar support is pressed toward the seat rear side is formed at the wire.