Vehicle Seat Back Frame Flange Bending Design
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Solution Overview
Problem
Conventional seat back frames for vehicles face challenges in suppressing bending deformation during rear collisions without increasing weight, often requiring additional reinforcing members.
Innovation Solution
The seat back frame features side portions with flange portions that include first and second extending portions bent at obtuse angles, which enhance the frame's rigidity and prevent cross-sectional collapse under load, thereby suppressing bending deformation without the need for additional reinforcing members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If flat tube portions or reinforcing members are mounted to the vertical frame to suppress bending deformation during rear collision, then the amount of bending deformation is reduced, but the number of parts increases leading to increased weight
Solution Approach 1:
The flange portion is divided into multiple extending portions (first extending portion and second extending portion) with different bending directions. This segmentation allows each portion to resist different方向的 loads, achieving comprehensive anti-buckling performance without adding external reinforcing members.
Solution Approach 2:
The flange portion transitions from a simple planar extension to a three-dimensional structure with multiple bending dimensions. The first extending portion bends in one direction while the second extending portion bends in another direction, creating a spatial configuration that enhances structural rigidity without increasing weight.
2Device complexity
If the flange portion is extended straight from the frame side plate portion, then the structure is simple, but cross-sectional collapsing occurs under compressive stress during rear collision
Solution Approach 1:
The flange portion incorporates curved bending configurations instead of straight extensions. The first extending portion bends at an obtuse angle and the second extending portion bends in another direction, creating a curved three-dimensional structure that resists compressive stress and prevents cross-sectional collapsing.
3Strength
If obtuse angle bending is applied to the first extending portion and second extending portion, then rigidity against bending deformation is increased, but manufacturing complexity increases
Solution Approach 1:
The first extending portion and second extending portion are integrated into a single flange portion structure that extends from the frame side plate portion. This merging allows the complex bent configuration to be formed as one continuous component, simplifying manufacturing processes while maintaining high rigidity.
Data Source
AI summary
At a side portion 22 of a seat back frame, not only does a rear first extending portion 52 bend and extend from a frame side plate portion 30 toward a seat back inner side at an obtuse angle, but also, in a vicinity of a central portion of a rear flange portion 50, a rear second extending portion 54 bends and extends from the rear first extending portion 52 further toward the seat back inner side. Therefore, even if a relatively large load toward a rear of a vehicle acts on the seat back frame and compressive stress is generated at an intermediate portion of the rear flange portion 50 in a heightwise direction of a seat back, it is difficult for cross-sectional collapsing to arise, and the load can be effectively supported at the frame side plate portion 30. There can be provided a seat back frame for a vehicle which can suppress an amount of bending deformation at the time of a rear collision, without leading to an increase in weight.