Vehicle Seatback Frame Lateral Strength and Interference Prevention
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Solution Overview
Problem
Conventional vehicle seatback frames have low lateral strength due to their 'I'-shaped lower cross members, which fail to meet strain requirements and cause interference between the back pad and recliner hinge shaft when the back frame tilts.
Innovation Solution
A seatback frame design featuring a lower cross member with a reinforcing embossed rib and a curved hinge-shaft cover that surrounds the recliner hinge shaft, eliminating the need for an additional tube to prevent interference and enhancing lateral strength through welding flanges and a locking projection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an 'I'-shaped lower cross member is used, then the structure is simple and manufacturing is easy, but the lateral strength is insufficient and strain requirements are not met
Solution Approach 1:
The lower cross member incorporates a reinforcing rib that protrudes locally to increase lateral strength in the critical area where strain requirements must be met, while maintaining the overall simple 'I'-shaped structure for ease of manufacture. This localized reinforcement allows the structure to satisfy both manufacturing simplicity and strength requirements simultaneously.
2Reliability
If a tube surrounds the recliner hinge shaft to prevent interference, then interference between back pad and hinge shaft is prevented, but the number of parts increases and device complexity increases
Solution Approach 1:
The patent integrates the interference prevention function directly into the lower cross member structure by forming a curved portion that surrounds the recliner hinge shaft. This merging of functions eliminates the need for a separate tube component, reducing the number of parts while maintaining reliable interference prevention between the back pad and hinge shaft.
Solution Approach 2:
The lower cross member is designed to perform multiple functions simultaneously: it provides structural support, prevents interference through its curved portion surrounding the hinge shaft, and maintains lateral strength through the reinforcing rib. This multi-functionality reduces overall device complexity by eliminating the need for separate components.
Data Source
AI summary
A seatback frame for vehicles has a lower cross member that prevents a back pad and a recliner hinge shaft from interfering with each other. The seatback frame includes a back frame and a lower cross member. The lower cross member includes a reinforcing part and a hinge-shaft cover. The back frame is hinged to a seat frame via a recliner hinge shaft. The lower cross member couples both sides of the lower end of the back frame to each other. The reinforcing part has the shape of an embossment which extends in a longitudinal direction of the lower cross member. The hinge-shaft cover is provided on the lower portion of the lower cross member, and is bent to surround the recliner hinge shaft.