Vehicle Seat Backrest Adjuster Load Distribution
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Solution Overview
Problem
Existing vehicle seat backrest adjusters often face issues with overloading and mechanical stress distribution, leading to inefficient and costly solutions for adjusting the inclination of the seat backrest.
Innovation Solution
A backrest adjuster design featuring a bracing element and a transmission element that connects the pivot bearing and fitting, with the bracing element being L-shaped and surrounded by the transmission element, allowing for a simple and cost-effective distribution of mechanical stresses by diverting loads into the substructure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional transmission shaft with joint fittings is used to adjust backrest inclination, then the backrest can be adjusted, but the fitting is prone to overloading and mechanical stress concentration
Solution Approach 1:
The transmission shaft is segmented into multiple transmission elements (first transmission element and second transmission element) that are arranged at different locations along the backrest adjuster. This segmentation distributes the mechanical loads and stresses across multiple points rather than concentrating them at a single fitting location, thereby preventing overloading and improving the durability of the fitting connection.
2Reliability
If a complex transmission mechanism is used to distribute loads, then the fitting is protected from overloading, but the device complexity increases
Solution Approach 1:
The transmission elements are integrated directly into the adjuster structure, merging the transmission function with the structural framework. This eliminates the need for separate, complex load-distribution mechanisms while still achieving effective load distribution through the strategically positioned transmission elements, thereby maintaining simplicity while improving reliability.
3Reliability
If additional structural elements are added to prevent overloading, then the fitting is protected, but the manufacturing cost increases
Solution Approach 1:
The transmission elements serve multiple functions: they transmit the adjustment motion from the actuator to the backrest, distribute mechanical loads along the adjuster structure, and provide structural support. This multi-functionality eliminates the need for additional separate components that would increase manufacturing cost, while still achieving the goal of preventing fitting overloading through integrated design.
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The invention relates to a vehicle seat and a backrest adjuster (1) for a vehicle seat in order to adjust the inclination of a backrest (2.1) of a vehicle seat (2), said backrest adjuster comprising a transmission element (5) that is coupled to a fitting (4) and to a pivot bearing (3). A clamping element (11) is mounted in the region of the pivot bearing (3) and in the region of the fitting (4) lying opposite the pivot bearing. In the region between the pivot bearing (3) and the fitting (4), said clamping element (11) is arranged at least in part in the transmission element (5).