Vehicle Seat Tilting Linkage for Stable Cushion Recline
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Solution Overview
Problem
Existing vehicle seat position adjustment devices face issues with stability during tilting operations, leading to gaps at connection points, shaking, vibration, and torsional deformation due to uneven load distribution and vehicle vibrations.
Innovation Solution
A vehicle seat position adjustment device that includes a tilting link mechanism hinged to a gearbox, which is moved rearwards along a lead screw, and a front link mechanism that pushes up the seat cushion frame, allowing for simultaneous tilting of the seat cushion and reclining of the seatback to achieve a relaxation comfort posture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a motor and lead screw are connected to only one side of the seat cushion frame to perform tilting, then the device complexity is reduced, but the seat cushion frame deforms due to uneven load distribution and vehicle vibrations, causing gaps at connection portions and resulting in shaking and vibration
Solution Approach 1:
The tilting mechanism is divided into two independent sides, each with its own motor, lead screw, and tilting link assembly. This segmentation allows each side to independently support and tilt the seat cushion frame, distributing the load evenly and preventing frame deformation and connection gaps that occur with single-sided actuation
Solution Approach 2:
The patent combines two complete tilting mechanisms (motor + lead screw + tilting link) on both sides of the seat cushion frame into a coordinated system. Both mechanisms work simultaneously and symmetrically to tilt the seat cushion, maintaining frame stability and eliminating the shaking and vibration problems caused by uneven load distribution
2Ease of operation
If the seat cushion tilts during operation, then relaxation comfort posture is achieved, but gaps are generated at connection portions between the tilting device and seat cushion frame, causing shaking, vibration, and torsional deformation
Solution Approach 1:
The tilting link is designed as a dynamic component that rotates about a hinge point during tilting operation. This rotational movement allows the connection between the tilting mechanism and seat cushion frame to maintain proper alignment and coupling force throughout the tilting range, preventing gap formation and connection instability
Solution Approach 2:
The tilting link acts as an intermediary component between the lead screw and the seat cushion frame. It translates the linear motion of the lead screw into rotational motion that tilts the seat cushion while maintaining stable connections at both ends through proper hinge joint design, eliminating shaking and torsional deformation
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
The solution enables stable and vibration-free tilting of the seat cushion and reclining of the seatback, effectively achieving a relaxation comfort posture while preventing deformation and ensuring passenger safety.
Implementation Method 1
a first lead screw inserted into and coupled to the first gear box in a forward-and-rearward direction so as to move the first gear box forwards and rearwards
Implementation Method 2
a seat cushion frame hinged to side frames respectively mounted on rear ends of the seat rails, a first tilting link hinged to the first fixing bracket
Data Source
AI summary
A vehicle seat position adjustment device is configured to stably perform a tilting operation of a seat cushion by performing an operation of rotating a first tilting link hinged to a gear box in a standing direction of a first tilting link while the gear box is moved rearwards along a lead screw, an operation of pushing up a second tilting link hinged to the first tilting link while the first tilting link is rotated in a standing direction, and an operation of allowing the second tilting link to push up a front end of a seat cushion frame. The vehicle seat position adjustment device may achieve a relaxation comfort posture by tilting the seat cushion and simultaneously reclining a seatback connected to the seat cushion rearwards.