Vehicle Seat Back Frame Joint for Rear-Force Resistance
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Solution Overview
Problem
Existing vehicle seat back frames are vulnerable to forces approaching from the rear due to their structural design, which compromises the strength of the extension portion.
Innovation Solution
A seat back frame design that incorporates a connection structure with both rear and front support portions to securely integrate the extension frame with the main body frame, enhancing structural strength by providing support from both directions, and allowing for reduced thickness in the front-back direction by positioning these support members at different heights.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a steel bracket connects the circular pipes from the rear only, then the connection structure is simple, but it is vulnerable to forces approaching from the rear
Solution Approach 1:
The connection structure is divided into two separate support portions: a rear support portion that contacts the rear sides of the circular pipes and a front support portion that contacts the front sides. This segmentation allows each portion to specialize in resisting forces from its respective direction, resolving the vulnerability to rear forces while maintaining structural simplicity
Solution Approach 2:
The support portions are positioned at different heights (different vertical positions) on the circular pipes. The rear support portion is positioned higher than the front support portion, creating a spatial arrangement that provides resistance to rear forces without interfering with front forces, effectively utilizing the vertical dimension to solve the directional strength problem
2Stability of the object's composition
If rear and front support portions are positioned at the same height, then the connection is symmetric, but the thickness in the front-back direction increases
Solution Approach 1:
The rear and front support portions are positioned at different vertical heights on the circular pipes rather than at the same height. The rear support portion is positioned higher than the front support portion, which reduces the thickness in the front-back direction while maintaining connection stability through the vertical dimension
Solution Approach 2:
The connection structure uses asymmetric positioning of the support portions at different heights, breaking the symmetry in the front-back direction. This asymmetric arrangement reduces the overall thickness while maintaining structural stability through the vertical height difference
3Device complexity
If the extension frame is supported only from the rear, then the structure is simple, but the extension portion lacks resistance to forces from both front and rear
Solution Approach 1:
The support structure is segmented into a rear support portion and a front support portion, each responsible for supporting the extension frame from its respective direction. This segmentation provides bidirectional resistance capability while keeping each individual support portion relatively simple in design
Solution Approach 2:
The rear and front support portions are positioned at different vertical heights, creating a three-dimensional support arrangement. This spatial distribution allows the extension frame to be supported from both front and rear directions simultaneously, improving reliability against bidirectional forces without requiring complex overlapping structures
Data Source
AI summary
Embodiments of the present invention may include a seat back frame of a vehicle seat. The vehicle seat has a seat back main body configured to support the back of an occupant and an extension portion extending from a side of the seat back main body. The seat back frame has a main body frame, an extension frame, and a connection member. The main body frame may form a framework of the seat back main body and may be mounted on a base. The extension frame may form a framework of the extension portion. The connection member connects the extension frame to a side of the main body frame. The connection member has a rear support portion and a front support portion. The rear support portion contacts the main body frame and the extension frame from the rear so that the rear support portion integrally couples the main body frame and the extension frame. The front support portion contacts with the main body frame and the extension frame from the front so that the front support portion can couple the main body frame and the extension frame.