Vehicle Seat Frame Spring Decoupling Mechanism
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Solution Overview
Problem
Existing vehicle seat frame structures lack an efficient mechanism for adjusting the inclination of the backrest relative to the seat cushion, particularly in compact designs, and do not allow for seamless transition between supported and free pivoting modes, leading to suboptimal user experience and space utilization.
Innovation Solution
A vehicle seat frame structure incorporating a pivot bearing and a spring device with a shaft-hub-connection featuring a clearance, which separates the force flow in an uncoupling angular region, allowing the user to manually adjust and latch the inclination angle and pivot the backrest freely without spring device support, enhancing the actuation characteristic and compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spring device is continuously coupled to the backrest frame part throughout the entire pivoting region, then the backrest receives constant support and stable positioning, but the user experiences opposing forces when folding the backrest flat, reducing loading space efficiency
Solution Approach 1:
The pivoting region is segmented into a first angular region (where the spring device is coupled and provides support) and a second angular region (where the spring device is uncoupled and allows free pivoting). This segmentation resolves the contradiction by providing stable positioning where needed and free pivoting where required for loading space optimization.
Solution Approach 2:
The coupling between the spring device and backrest frame part is made dynamic rather than static. The coupling state changes based on the inclination angle, being coupled in the first angular region and uncoupled in the second angular region. This dynamic adaptation allows the system to provide support when needed and allow free movement when required.
2Force
If the spring device is designed to support the backrest throughout the entire range of motion, then consistent force support is provided, but the mechanism becomes more complex and requires additional components for continuous engagement
Solution Approach 1:
The spring device is extracted from continuous engagement and is only coupled in the specific angular region where support is needed. This extraction simplifies the overall mechanism by eliminating the need for complex continuous engagement components while maintaining the necessary support function.
Solution Approach 2:
The shaft-hub connection with clearance automatically transitions the spring device between coupled and uncoupled states based on the inclination angle. The mechanism self-regulates the coupling state without requiring additional control components, simplifying the overall system while maintaining appropriate force support.
3Adaptability or versatility
If a shaft-hub connection with clearance is used to separate the force flow, then the uncoupling angular region is achieved, but the manufacturing precision requirements increase due to the clearance specification
Solution Approach 1:
The clearance in the shaft-hub connection is designed with specific dimensional parameters that define the transition between coupled and uncoupled states. By carefully selecting and controlling these parameters, the system achieves reliable pivoting mode transition while maintaining manufacturability through standardized tolerance ranges.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables smooth adjustment and latching of the backrest inclination, providing user-controlled pivoting with reduced spring support in the uncoupling region, improving user experience and space utilization by allowing the backrest to fold flat without opposing forces, thus optimizing the loading space.
Implementation Method 1
The vehicle seat frame structure comprises a spring device arranged in a force flow between the backrest frame part and the seat cushion frame part. The spring device biases the backrest frame part with a moment about the pivot axis having a direction for reducing the inclination angle
Data Source
AI summary
The present disclosure relates to a vehicle seat frame structure comprising a backrest frame part and a seat cushion frame part. The backrest frame part and the seat cushion frame part are supported by a pivot bearing for being pivoted about a pivot axis. A spring device is biased with the pivoting movement. The spring device is only effective in a comfort inclination angular region. If the backrest frame part is pivoted out of the comfort inclination angular region towards the front, the spring device is released from the force flow between the backrest frame part and the seat cushion frame part. The release is provided by a shaft-hub-connection between a coupling section of a shaft and a hub of a hub body, the shaft-hub-connection comprising an angular clearance.