Automobile Seat Back Pivot Layout to Eliminate Cushion Step Difference
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Solution Overview
Problem
Existing automobile seats suffer from a step difference between the seat back and seat base during backward adjustment, which affects ride comfort by causing the seat back to press against the passenger's back.
Innovation Solution
The automobile seat features a seat back adjusting mechanism with a rotating part located at the lower end of the seat back, allowing the seat back to rotate about the rear end of the seat base with a center of rotation below the seat base's upper end surface, minimizing or eliminating the step difference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the seat back is adjusted backward with a rotation center located above the seat base, then the seat back can be adjusted for comfort, but a step difference is formed between the lower end of the seat back and the seat base, pressing against the passenger's back and reducing ride comfort
Solution Approach 1:
The patent inverts the conventional design by placing the rotation center of the seat back below the seat base instead of above it. This inversion changes the rotation trajectory of the seat back, allowing the lower end to move backward and downward simultaneously, eliminating the step difference that would otherwise press against the passenger's back while maintaining adjustment functionality
2Object-affected harmful factors
If additional mechanisms are added to ensure the seat base and seat back rotate together, then ride comfort is improved, but the production cost of the seat increases
Solution Approach 1:
The patent segments the seat adjustment system into independent components: the seat base adjustment mechanism and the seat back adjustment mechanism with the inverted rotation center. This segmentation allows each component to function independently without requiring additional coupling mechanisms, reducing device complexity while maintaining the ability to eliminate step difference and improve ride comfort
3Object-affected harmful factors
If a softer foam or larger fillet is used in the front bump area, then ride comfort is improved, but the step difference between the seat back and seat base is not reduced and production cost increases
Solution Approach 1:
Instead of modifying the foam or fillet to compensate for the step difference, the patent inverts the rotation center position to fundamentally eliminate the step difference at its source. This structural inversion prevents the formation of the harmful step difference during seat back adjustment, maintaining manufacturing precision while improving ride comfort without additional material costs
Data Source
AI summary
An automobile seat and an automobile comprising same, the automobile seat comprising a seat base, a seat back and a seat back adjusting mechanism; the seat back adjusting mechanism comprises a rotating part which is disposed at the lower end of the seat back; the rotating part rotates about the rear end part of the seat base to enable the angle between the seat back and the seat to be changed, and the center of rotation of the rotating part is located below the upper end surface of the seat base. A small step difference may be formed between the lower end part of the seat back and the upper end surface of the seat base when the seat back rotates, and a step difference may even be avoided. The lower end part of the seat back basically does not abut against and press the back of a passenger.