Dual-Shaft Rotation Structure for Smooth 360° Hinge Motion
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Solution Overview
Problem
The dual-axis rotation structure in electronic devices, particularly in cam-slider mechanisms, often results in a stop-and-go feeling due to radial displacement for crescent position changes, affecting user experience.
Innovation Solution
A rotation structure comprising a first and second rotating shaft assembly with a stopper, where the stopper's protrusions are limited to move within grooves on the wheels, allowing asynchronous rotation and eliminating the need for radial displacement, enabling smooth opening and closing of electronic device components like a notebook computer between 0° to 360°.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If cam-slider structure is used for asynchronous dual-axis rotation, then the switching mechanism can be realized, but radial displacement of slider causes stop-and-go feeling
Solution Approach 1:
Instead of using a cam-slider structure where the slider moves radially to achieve crescent position changes, the patent inverts the approach by using a stopper with protrusions that move along grooves on the wheels. This inversion eliminates the radial displacement issue and the associated stop-and-go feeling, providing smooth rotation while maintaining the asynchronous dual-axis functionality.
Solution Approach 2:
The patent introduces a stopper as an intermediary component with protrusions that interact with grooves on both wheels. This intermediary mechanism enables the switching between synchronous and asynchronous rotation modes without requiring radial displacement of sliders, thereby achieving smooth operation while controlling structural complexity.
2Adaptability or versatility
If cam-slider structure is used, then asynchronous dual-axis rotation can be achieved, but user experience is affected by stop-and-go feeling
Solution Approach 1:
The patent inverts the conventional cam-slider approach by using grooves on wheels and protrusions on a stopper. This inversion maintains the ability to switch between synchronous and asynchronous rotation modes while eliminating the stop-and-go feeling that degrades user experience, thus achieving both adaptability and ease of operation.
3Reliability
If radial displacement is used for crescent position changes, then switching mechanism works, but stop-and-go feeling occurs
Solution Approach 1:
The patent inverts the displacement mechanism: instead of radial displacement of sliders, it uses axial movement of stopper protrusions along grooves. This inversion maintains reliable switching between rotation modes while eliminating the stop-and-go feeling, achieving both reliability and smooth operation.
Solution Approach 2:
The patent changes the dimension of displacement from radial to axial. The stopper protrusions move along grooves in the axial direction rather than radially, which maintains the switching functionality while eliminating the stop-and-go effect during rotation, thus improving rotation smoothness without compromising reliability.
Data Source
AI summary
A rotation structure includes a first rotating shaft assembly, a second rotating shaft assembly, and a stopper. The first rotating shaft assembly includes a first shaft and a first wheel, a first groove being arranged on the first wheel. The second rotating shaft assembly includes a second shaft and a second wheel, the second shaft and the first shaft satisfying a parallel condition, a second groove being arranged on the second wheel. A first protrusion and a second protrusion are arranged on the stopper, the first protrusion being limited to move in the first groove, the second protrusion being limited to move in the second groove, and the limit of the first groove to the first protrusion and the limit of the second groove to the second protrusion allow one of the first shaft and the second shaft to rotate.