Vehicle Seat Back Frame Flange Layout for Gap-Resistant Joints
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Solution Overview
Problem
Existing vehicle seat back frames face challenges in maintaining strength while minimizing joining defects due to dimensional variations and gaps at multiple joint surfaces.
Innovation Solution
A back frame configuration with flange portions on the side frames that ensure reliable contact and reduce the influence of dimensional variations, incorporating a continuous third flange portion to maintain rigidity and strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the first side frame is joined to the lower frame at three or more portions, then rigidity and strength are improved, but joining defects occur due to accumulation of dimensional variations at multiple joint surfaces
Solution Approach 1:
The first side frame is divided into multiple flange portions (first, second, and third flange portions) that extend toward the lower frame. These segmented flange portions are joined to the lower frame at two specific locations rather than three or more, reducing the accumulation of dimensional variations while maintaining structural integrity through the distributed flange configuration
Solution Approach 2:
The flange portions act as intermediary elements between the side frame and lower frame. By providing extended flange surfaces that make contact with the lower frame, they serve as mediators that distribute joining forces and reduce the impact of dimensional variations, eliminating the need for three or more separate joint portions
2Manufacturing precision
If the first side frame is joined to the lower frame at only two portions, then joining defects are reduced, but rigidity and strength may be insufficient
Solution Approach 1:
The flange portions extend in a direction perpendicular to the main body of the side frame, creating an additional dimensional aspect for joining. This extension into the flange dimension allows two joint portions to provide sufficient rigidity and strength by distributing forces across extended surfaces rather than concentrated points
Solution Approach 2:
The side frame structure combines the main frame body with multiple flange portions of varying extending dimensions. This composite configuration, where different portions have different extending dimensions, creates a structurally optimized assembly that achieves both reduced joining defects and maintained rigidity through the heterogeneous flange design
3Strength
If three or more joint surfaces are provided, then strength is improved, but gaps occur due to accumulation of dimensional variations
Solution Approach 1:
The side frame is segmented into multiple flange portions that are strategically positioned and extended. By segmenting the joining structure into these specific flange portions rather than using three or more separate joint surfaces, the design reduces gap formation while maintaining strength through the extended contact surfaces of the flanges
Solution Approach 2:
Instead of providing three or more joint surfaces, the design uses two flange portions with extended dimensions that provide sufficient contact area. This partial action approach achieves the necessary strength and gap prevention without the excessive number of joint surfaces that would accumulate dimensional variations
Data Source
AI summary
To provide a back frame of a vehicle seat. A back frame of the present disclosure includes a first side frame, a second side frame, an upper frame, a lower frame, a first flange portion, a second flange portion, and a third flange portion. The first flange portion is provided on a rear end side of the first side frame and is joined to the lower frame. The second flange portion is located on a front side of the first flange portion in an outer edge of the first side frame and is joined to the lower frame. The third flange portion is provided in a predetermined range of the outer edge of the first side frame.