Vehicle Seat Back Side Portion Rotation Restriction
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Solution Overview
Problem
Conventional vehicle seat back side portions wobble when subjected to a load from an occupant, compromising stability and occupant safety.
Innovation Solution
A vehicle seat design featuring a seat back side portion with a first attachment portion at the lower end and a rotation-restricting protrusion positioned laterally apart from the attachment, which contacts either the vehicle body or seat cushion to prevent rotation, enhancing rigidity and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the seat back side portion is fixed at one portion only, then the device complexity is reduced, but the stability and rigidity deteriorate causing wobbling
Solution Approach 1:
The attachment structure is segmented into two distinct functional portions: a first attachment portion for securing the seat back side portion to the vehicle body, and a rotation-restricting portion positioned at a different location to prevent rotational movement. This segmentation allows each portion to perform its specific function independently, resolving the contradiction between simple structure and stable performance.
Solution Approach 2:
The rotation-restricting portion acts as an intermediary element between the seat back side portion and the vehicle body. It mediates the connection by providing rotational restriction while allowing the first attachment portion to handle the primary attachment function, thereby enhancing stability without significantly increasing overall structural complexity.
2Ease of manufacture
If a single attachment portion is used, then the manufacturing cost is reduced, but the rigidity and occupant support stability worsen
Solution Approach 1:
The attachment system is divided into two functional segments: the first attachment portion for basic securing and the rotation-restricting portion for preventing rotational movement. This segmentation provides enhanced rigidity and occupant support stability while maintaining relatively simple manufacturing processes for each individual component.
Solution Approach 2:
Different portions of the attachment structure are designed with locally optimized qualities: the first attachment portion is designed for secure attachment, while the rotation-restricting portion is specifically designed with geometric features (such as protrusions or contact surfaces) that provide rotational restriction. This local quality differentiation enhances overall rigidity without requiring complex manufacturing throughout the entire structure.
Data Source
AI summary
An automotive rear seat (1) includes a seat cushion (2) and a seat back (6). The seat back (6) includes a seat back main body portion (10) and a seat back side portion (20) disposed on one side of the seat back main body portion (10). The seat back side portion (20) is fixed to a vehicle body (body frame (FR)) or the seat cushion (2) via a first attachment portion (30) provided on a lower portion of the seat back side portion (20), and the seat back side portion (20) includes, at a position different from a position at which the first attachment portion (30) is provided, a rotation-restricting portion (40) configured to contact the vehicle body or the seat cushion (2) to restrict rotation of the seat back side portion (20).