Vehicle Seat Frame Locking for Slope-Stable Easy Entry
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Solution Overview
Problem
Existing vehicle seat frames face challenges in preventing the back frame from being restored rearward during easy entry operations, especially when the vehicle is on a slope, which complicates entry and exit for rear seat passengers and can lead to premature restoration of the recliner system.
Innovation Solution
A seat frame design incorporating a rotary spring at the lower end of the back frame to fold the seat forward and a flat spring with a slider to prevent rearward restoration, allowing the seat to slide forward on a rail while maintaining the back frame in a fixed position until the rail is restored to its initial position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a spiral spring is used to fold the back frame forward, then the back frame can be folded forward for easy entry, but the back frame may be restored rearward and fixed before the rail is restored to the initial position when the vehicle is on a slope
Solution Approach 1:
A flat spring is introduced as an intermediary component between the back frame and the rail mechanism. This flat spring acts as a mediator that controls the interaction between the back frame restoration and rail restoration, ensuring that the rail is restored first and the back frame is restored only after the rail reaches its initial position, thereby preventing premature back frame restoration on slopes
Solution Approach 2:
The flat spring is designed to engage with the rail mechanism before the back frame restoration begins. By performing the rail restoration action first through the flat spring's preliminary engagement, the system ensures that the back frame cannot be restored rearward until the rail has already been restored to its initial position, establishing the correct restoration sequence in advance
2Device complexity
If the back frame is allowed to restore rearward freely, then the spiral spring mechanism is simple, but the easy entry performance deteriorates when the vehicle is placed on a slope
Solution Approach 1:
The flat spring serves as a mediating component that connects the back frame restoration mechanism with the rail system. It introduces a controlled interaction that prevents direct, uncontrolled back frame restoration, thereby maintaining easy entry performance on slopes while adding only a single flat spring component to the existing spiral spring mechanism
Solution Approach 2:
The flat spring introduces dynamic control to the back frame restoration process. It creates a conditional restoration mechanism where the back frame can only restore rearward after specific conditions are met (rail restoration completion), transforming the static spring mechanism into a dynamically controlled system that adapts to slope conditions
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
This design enhances the ease of entry and exit for rear seat passengers by preventing the back frame from being restored rearward during slope conditions and avoids premature recliner restoration, improving the overall performance of the easy entry system without altering the existing easy entry module or back frame structure.
Implementation Method 1
a rotary spring disposed at a lower end of the back frame and configured to fold the vehicle seat forward when a lever operates
Implementation Method 2
a flat spring disposed at the lower end of the back frame and including a slider configured to fix the back frame
Implementation Method 3
a slider configured to fix the back frame, which is provided on a lower surface of the back frame, so as to prevent the vehicle seat from being restored rearward
Data Source
AI summary
Disclosed is a seat frame for a vehicle, the seat frame including a back frame provided on a vehicle seat and including a rotary spring disposed at a lower end thereof, the rotary spring is configured to fold the vehicle seat forward when a lever operates, and a flat spring disposed at the lower end of the back frame and including a slider provided on a lower surface of the back frame and configured to fix the back frame so as to prevent the vehicle seat from being restored rearward when the vehicle seat is folded forward.