Multi-axis Rotary Shaft Link Device for Thin Electronics
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Solution Overview
Problem
Conventional dual-shaft mechanisms in electronic devices, such as notebooks, limit the freeness of rotation and operational smoothness due to design constraints for lightweight and thin structures, leading to reduced engagement depth and potential rotational slippage, which affects user experience and increases component volume.
Innovation Solution
A multi-axis rotary shaft link device with a simplified structure featuring gear transmission units, reaction units, and plate-like link units with tooth structures, allowing synchronous rotation around multiple centers, and enabling modular assembly for improved operational smoothness and reduced component size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional dual-shaft mechanisms are designed for lightweight and thin structures, then the device size is reduced, but the engagement depth between components is reduced causing rotational slippage
Solution Approach 1:
The patent implements a nested structure where the fourth shaft is disposed inside the second shaft, and the third shaft is disposed inside the first shaft. This nesting arrangement allows multiple shafts to occupy the same spatial envelope, effectively reducing the overall device volume while maintaining sufficient engagement depth between gear transmission units and reaction units, thereby preventing rotational slippage.
Solution Approach 2:
The patent transitions from a planar two-dimensional layout to a three-dimensional spatial arrangement by stacking shafts and link devices in multiple layers. The first and second shafts form a first link device, while the third and fourth shafts form a second link device, with the fourth shaft nested inside the second shaft. This dimensional change enables compact packaging without compromising engagement depth.
2Strength
If multiple conventional pivot shaft devices are arranged side by side, then structural strength is improved, but the freeness of rotation is limited and operational smoothness deteriorates
Solution Approach 1:
The patent divides the rotary shaft mechanism into modular link devices. Each link device consists of a shaft assembly with gear transmission units and reaction units connected by link units. The first link device includes the first and second shafts, while the second link device includes the third and fourth shafts. This segmentation allows each module to rotate independently around its own center, improving operational smoothness while maintaining structural strength through modular construction.
Solution Approach 2:
The patent introduces link units as intermediary components connecting the gear transmission units and reaction units. These link units act as mediators that transmit motion and force between shafts while allowing smooth rotation. The link units with tooth structures engage with the gear transmission units and reaction units, enabling free rotation around multiple centers without compromising structural integrity.
3Weight of moving object
If gear transmission components are minified for lightweight design, then device weight is reduced, but transmission precision deteriorates due to reduced engagement depth
Solution Approach 1:
The nested arrangement of the fourth shaft inside the second shaft and the third shaft inside the first shaft allows the gear transmission units and reaction units to be positioned in three-dimensional space rather than spread out in two dimensions. This nesting enables sufficient engagement depth between meshing gears while keeping the overall component size small, thereby maintaining transmission precision without increasing device weight.
Solution Approach 2:
By transitioning from a two-dimensional planar layout to a three-dimensional stacked arrangement, the patent enables gear transmission units and reaction units to engage with sufficient depth while maintaining compact overall dimensions. The vertical stacking of shafts and link devices in multiple layers allows adequate meshing depth for precise transmission without increasing the device's planar footprint or weight.
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 multi-axis rotary shaft link device enables smooth and free rotation around multiple centers, reducing component size and volume, enhancing user experience, and allowing for modular assembly, thus addressing the limitations of conventional designs.
Implementation Method 1
a first link device including a first shaft (10) and a second shaft (20)... a transmission unit (33) disposed on the first shaft (10)... a reaction unit (44) disposed on the second shaft (20)... a link unit (50) disposed between the transmission unit (33) and the reaction unit (44)
Data Source
AI summary
A multi-axis rotary shaft link device has a simplified structure occupying less room and is easy to assemble. The multi-axis rotary shaft link device includes a transmission unit disposed on a first shaft, a reaction unit disposed on a second shaft and a link unit disposed between the transmission unit and the reaction unit for making the first and second shafts synchronously rotate. The second shaft and a third shaft are assembled with a driven module for rotating the third shaft and a transmission unit disposed on the third shaft. A link unit is disposed between the third shaft and a fourth shaft, whereby the fourth shaft and a reaction unit disposed on the fourth shaft can synchronously rotate with the third shaft. The multi-axis rotary shaft link device can freely rotate around multiple rotational centers, which can be smoothly opened and closed.