Vehicle Seat Backrest-Coupled Upper Portion for H-Point Stability
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Solution Overview
Problem
Existing vehicle seats face the issue where changing the backrest inclination alters the position of the SIP or H point, reducing the usable space on the seat upper portion, requiring adjustments to the seat upper portion to maintain a consistent seating position.
Innovation Solution
A vehicle seat design where the seat upper portion is synchronously displaced relative to the seat part when the backrest is rotated, using a lever mechanism to maintain the SIP or H point position, preventing changes in the seating position and ensuring consistent usable space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the backrest inclination is changed, then the backrest can be adjusted to different positions, but the position of the SIP point or H point changes and the usable space on the seat part upper portion is reduced
Solution Approach 1:
A coupling mechanism acts as an intermediary between the backrest and the seat part upper portion. When the backrest inclination changes, this mechanism automatically translates the movement into a corresponding displacement of the seat part upper portion, maintaining the SIP point or H point position without requiring manual intervention.
Solution Approach 2:
The seat part upper portion is made dynamically connected to the backrest through the coupling mechanism. Instead of being fixed or independently adjustable, it automatically moves in response to backrest inclination changes, creating a dynamic system that maintains consistent seating geometry.
2Ease of operation
If the backrest inclination changes, then the backrest position is adjusted, but the SIP point or H point position changes requiring additional adjustments
Solution Approach 1:
The coupling mechanism enables the seat system to self-adjust. When the backrest inclination is changed, the mechanism automatically performs the necessary seat part upper portion displacement to maintain the SIP point or H point position, eliminating the need for additional manual adjustments by the user.
Solution Approach 2:
The functions of backrest inclination adjustment and seat part upper portion position maintenance are merged into a single coupled system. One adjustment action simultaneously achieves both objectives, simplifying the overall operation.
Data Source
AI summary
Vehicle seat comprising a backrest, a seat part and a seat part upper portion connected to the seat part and displaceable relative to the seat part, the backrest being connected to the seat part in such a manner as to be rotatable about a first axis of rotation, characterised in that the backrest and the seat part upper portion are connected to one another in such a way that, when the backrest is rotated about the first axis of rotation, the seat part upper portion is displaced relative to the seat part.