Seat Back Frame Projection for Lumbar Impact Load Absorption
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Solution Overview
Problem
The existing vehicle seat back frames lack sufficient bearing capacity, particularly in the lumbar region, to effectively absorb excessive impact loads during rapid acceleration or collisions, as they do not provide adequate support or distribution of forces.
Innovation Solution
A vehicle seat back frame design featuring a projecting part extending forward and upward from the lower frame, with a separate member and bent portions, which is inclined to improve load distribution and absorption, and includes a pressure-receiving member with specific mounting and deformation characteristics to enhance support and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the seat back frame uses a simple lower frame structure, then the device complexity is reduced, but the bearing capacity for impact loads is insufficient
Solution Approach 1:
The lower frame is segmented into multiple components: left and right side parts, a connecting part joining them, and a separate projecting part. This segmentation allows each component to be optimized for its specific function while collectively providing enhanced impact load bearing capacity without excessive overall complexity.
Solution Approach 2:
The projecting part extends in the vehicle width direction (left-and-right dimension) beyond the conventional lower frame boundaries. This dimensional extension provides additional support surface area for impact loads without significantly increasing vertical or longitudinal complexity.
2Strength
If the projecting part is formed as a separate member, then the bearing capacity is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The projecting part is connected to the connecting part of the lower frame through a joining operation. This merging approach allows the projecting part to be manufactured separately (enabling optimization of its geometry for impact absorption) while still achieving a unified structural function when assembled, balancing manufacturing flexibility with structural integrity.
3Strength
If the projecting part extends further forward, then the lumbar support is improved, but the space requirement increases
Solution Approach 1:
The projecting part is positioned specifically in the middle of the lower frame in the vehicle width direction, providing localized lumbar support enhancement. This targeted approach improves support where needed without extending the frame footprint uniformly across the entire seat width, thus minimizing space requirements while maximizing functional benefit.
Data Source
AI summary
A vehicle seat is provided in which a projecting part is integrally provided in a middle part of a lower frame of a seat back frame forming a framework of a seat back and is extending further forward and upward than the lower frame. This enables the impact absorption when the seat back receives an impact load from the rear to be enhanced, while stabilizing the supporting force applied to the occupant by the seat back for supporting the occupant's back.