Dual Rotating Shaft Linkage for Accurate Foldable Hinge Synchronization
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Solution Overview
Problem
Current dual rotating shaft mechanisms for foldable electronic devices require complex gear transmission mechanisms, leading to high manufacturing and assembly accuracy requirements, increased costs, and assembly errors due to center distance tolerance issues in multi-gear systems, which complicates achieving synchronous rotation with high accuracy.
Innovation Solution
A dual rotating shaft mechanism that replaces complex gear structures with a rotating shaft base, first and second rotating members, and a linkage member, allowing for synchronous rotation and sliding relative to the rotating shaft base, thereby reducing assembly complexity and improving accuracy while balancing twisting forces for various angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex gear transmission mechanism is used to achieve synchronous rotation of dual rotating shafts, then the synchronous rotation function is realized, but the device complexity increases and manufacturing precision requirements become higher
Solution Approach 1:
The patent extracts and eliminates the complex gear transmission mechanism from the dual rotating shaft structure, replacing it with a simplified linkage mechanism. The linkage member directly connects the two rotating shafts through sliding and rotating joints, removing the intermediate gear components while maintaining the synchronous rotation function. This extraction principle resolves the contradiction by removing unnecessary complexity while preserving the core functional requirement of synchronous rotation.
Solution Approach 2:
The patent introduces a linkage member as an intermediary element between the two rotating shafts. This linkage member includes sliding blocks that move along guide slots and rotating joints that connect to both shafts, serving as a mediator to transmit motion and maintain synchronization without requiring complex gear mechanisms. The intermediary linkage simplifies the overall structure while achieving the desired synchronous rotation effect.
2Reliability
If a complex gear transmission mechanism is used, then synchronous rotation is achieved, but manufacturing accuracy and assembly accuracy requirements increase
Solution Approach 1:
By removing the gear transmission mechanism entirely, the patent eliminates the need for precise gear tooth engagement, center distance control, and gear mesh alignment. The simplified linkage mechanism with sliding blocks and rotating joints has fewer critical dimensions and tolerances, significantly reducing manufacturing and assembly accuracy requirements while maintaining synchronous rotation functionality.
Solution Approach 2:
The patent changes the motion transmission parameters from gear tooth engagement to sliding block movement along guide slots. This parameter change transforms the high-precision rotational coupling requirement into a lower-precision linear guidance requirement, where the sliding blocks move along predetermined paths, reducing the overall manufacturing and assembly precision demands of the system.
3Reliability
If a complex gear transmission mechanism is used, then synchronous rotation function is realized, but product costs increase
Solution Approach 1:
The patent extracts and removes the expensive gear transmission components, including multiple gears, gear shafts, and precision bearings. The simplified linkage mechanism uses fewer parts with lower manufacturing costs, such as sliding blocks, guide slots, and simple rotating joints. This extraction of unnecessary complex components directly reduces material costs, manufacturing costs, and assembly costs while maintaining the synchronous rotation function.
Solution Approach 2:
The patent replaces expensive, precision-critical gear components with simpler, more cost-effective linkage elements. The sliding blocks and guide slots can be manufactured using standard machining processes rather than precision gear cutting, and the rotating joints use simple bearings or pin connections instead of complex gear assemblies. This substitution with cheaper components reduces overall product cost while achieving the same functional outcome.
Data Source
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AI summary
A dual rotating shaft mechanism (100), a foldable assembly (200) and an electronic device (300) are provided. The dual rotating shaft mechanism (100) is applicable to the electronic device (300) which includes a first main body (54) and a second main body (64). The dual rotating shaft mechanism (100) includes a rotating shaft base (10), a first rotating member (20), a second rotating member (30), and a linkage member (40). The first rotating member (20) and the second rotating member (30) are each rotatably connected with the rotating shaft base (10), the first rotating member (20) is configured to be connected with the first main body (54), and the second rotating member (30) is configured to be connected with the second main body (64), to drive the first main body (54) and the second main body (64) to unfold or fold relative to each other. The linkage member (40) is slidably connected with the rotating shaft base (10), the linkage member (40) is further rotatably and slidably connected with the first rotating member (20) and the second rotating member (30), and the first rotating member (20) and the second rotating member (30) are configured to drive the linkage member (40) to slide relative to the rotating shaft base (10) and synchronously rotate relative to the rotating shaft base (10) through the linkage member (40). The dual rotating shaft mechanism avoids adopting a complex gear structure, which reduces assembly errors, improves transmission accuracy, and reduces costs. Rotating twisting forces of the first rotating member (20) and the second rotating member (30) are balanced, such that rotating twisting force requirements for various angles can be met.