Five-Link Seat Structure for Zero-Gravity Angle and Height Adjustment
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Solution Overview
Problem
Existing vehicle seats lack the ability to achieve an ideal zero-gravity state due to limited inclination angle and height adjustment ranges, restricting comfort and vision for occupants.
Innovation Solution
A seat five-link structure with a bottom support, wall plate, and multiple pivotally connected links, driven by electric motors, allowing for a broader adjustment range of inclination angle and seat height, including a 0-22.5° angle and 0-100 mm height adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a three-link structure is used for seat adjustment, then the structure is simpler, but the inclination angle adjustment range is limited and zero-gravity state cannot be achieved
Solution Approach 1:
The seat adjustment mechanism is divided into multiple independent links (first front link, second front link, rear link) connected by pivot axes, allowing each link to contribute to the overall adjustment range. This segmentation enables the system to achieve a broader inclination angle range (0-22.5°) compared to simpler three-link structures, while maintaining mechanical feasibility and control.
2Adaptability or versatility
If a four-link structure is used for seat adjustment, then the structure provides moderate adjustment capability, but the inclination angle range is still limited to 0-6° and knees cannot reach heart level
Solution Approach 1:
The five-link structure introduces an additional degree of freedom and dimensional capability compared to four-link structures. By adding the second front link and its associated pivot connections, the system expands its operational space, enabling inclination angles up to 22.5° that allow knees to reach heart level and achieve true zero-gravity positioning.
3Length of moving object
If seat height adjustment range is limited to 0-55.1 mm, then the structure is more compact, but the field of vision and comfort are limited
Solution Approach 1:
The seat adjustment mechanism employs dynamic linkages with multiple pivot points that enable extended adjustment ranges. The five-link structure with its sequential pivot connections allows the seat to achieve height adjustments up to 100 mm while maintaining structural integrity and control, thereby improving both occupant comfort and field of vision without excessive structural complexity.
Data Source
AI summary
The present invention relates to a seat five-link structure (A), comprising a bottom support (1), a wall plate (3), a first front link (4), a second front link (5) and a rear link (2), wherein the bottom support (1) is pivotally connected with the first front link (4) through a first pivot axis (O1), the first front link (4) is pivotally connected with the second front link (5), the second front link (5) is pivotally connected with the wall plate (3), and the rear link (2) is pivotally connected with the bottom support (1) through a second pivot axis (O2) and is pivotally connected with the wall plate (3); a first electric motor (8) configured to output a first external force for driving the first front link (4) to rotate around the first pivot axis (O1); and a second electric motor (12) configured to output a second external force for driving the rear link (12) to rotate around the second pivot axis (O2). The seat five-link structure (A) according to the present invention may have a larger adjustment range of an inclination angle and a seat height, which is beneficial to the realization of a zero-gravity function and allows an occupant better vision and better comfort.