Multi-Segment Rotary Shaft for Laptop Hinge Misalignment
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Solution Overview
Problem
Conventional pivot devices in electronic devices, such as notebooks, often have misaligned shaft axes, limiting the rotational freeness and smooth opening/closing of the upper cover, resulting in coordination issues and reduced operational smoothness.
Innovation Solution
A plug-in connection multi-segment rotary shaft structure comprising driving and driven joint assemblies with synchronous driving sections, middle link plates, and shaft pins, allowing for synchronized rotation around multiple centers, enhancing rotational freeness and smooth operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional pivot devices with single shaft and sleeve are used, then the structure is simple, but the rotational freeness is limited and the opening/closing operation is not smooth
Solution Approach 1:
The pivot device is divided into multiple segments including driving joint assembly and driven joint assembly, each with its own rotational center. This segmentation allows independent rotation at each joint, significantly improving rotational freeness while maintaining reasonable structural complexity through modular design
Solution Approach 2:
The driven joint assembly is nested within the driving joint assembly structure, with the driven plates positioned between the joint plates. This nesting approach improves rotational smoothness by allowing the inner driven components to follow the motion of outer driving components, while keeping the overall device compact
2Strength
If two sets of pivot devices are disposed on two sides of the junction, then the support structural strength is improved, but the coordination rotation becomes difficult due to misaligned shaft axes
Solution Approach 1:
The pivot device transitions from a fixed single-axis rotation to a dynamic multi-axis rotation system. The driving and driven joint assemblies allow the upper cover to rotate around multiple centers simultaneously, adapting to the natural movement patterns and improving coordination rotation while maintaining support strength through the distributed joint structure
Solution Approach 2:
The middle link plate assembly acts as an intermediary between the driving joint assembly and the upper cover. It transfers and coordinates the rotational motion from multiple driving joints to the upper cover, ensuring smooth coordinated rotation even with multiple support points, while the support strength is maintained through the rigid connection structure
Data Source
AI summary
A plug-in connection multi-segment rotary shaft structure includes a driving joint assembly and a driven joint assembly. The driving joint assembly includes two opposite joint plates and a middle link plate assembly engaged therebetween. The driven joint assembly is disposed between the joint plates and includes two driven plates. Opposite inward ends of the driven plates are formed with synchronous driving sections drivingly engaged with each other. Inward ends of the opposite joint plates are connected with the outward ends of the driven plates. Outward ends of the joint plates are formed with plugs. Outward ends of the middle link plate assembly are connected with the inward ends of the driven plates. The driving joint assembly and driven joint assembly are connected and combined, whereby the joint plates can be freely rotated around multiple rotational centers.