Foldable Hinge Rotation Mechanism Without Synchronous Gears
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Solution Overview
Problem
The complex structure of synchronous gears in rotating mechanisms of foldable electronic devices increases their thickness, hindering the thinning of these devices.
Innovation Solution
A rotating mechanism that implements synchronous rotation without synchronous gears, using a slider between rotating rods to drive synchronous swing arms, with helical slots and protrusions for synchronized rotation, and additional features like helical slots and mounting holes for enhanced stability and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If synchronous gears are used to perform synchronous movement in rotating mechanisms, then reliable synchronous rotation is achieved, but the structure becomes complex and thickness increases
Solution Approach 1:
The patent extracts and removes the synchronous gears from the rotating mechanism, replacing them with a gearless synchronous drive system. The synchronous swing arms are directly driven by rotating rods connected to drive sources, eliminating the need for complex gear transmissions while maintaining synchronous rotation functionality through direct mechanical coupling and geometric constraints.
Solution Approach 2:
The patent substitutes the traditional mechanical gear system with an alternative mechanical arrangement using rotating rods, sliders, and helical slots. This replacement maintains the synchronous rotation function through direct drive mechanisms and geometric constraints rather than through gear meshing, thereby simplifying the overall structure.
2Reliability
If synchronous gears are used to perform synchronous movement in rotating mechanisms, then reliable synchronous rotation is achieved, but the thickness of the rotating mechanism increases
Solution Approach 1:
By removing the synchronous gears entirely, the patent eliminates the thickness contribution of gear assemblies, tooth profiles, and gear mounting structures. The gearless design allows for a more compact arrangement of the synchronous swing arms and rotating rods, directly reducing the overall thickness of the rotating mechanism while preserving synchronous rotation capability.
3Adaptability or versatility
If synchronous gears are used in rotating mechanisms, then synchronous rotation function is achieved, but the structure cannot be simplified and thinning is hindered
Solution Approach 1:
The patent extracts the synchronous rotation function from the gear system and implements it through a simplified mechanism using rotating rods, sliders, and helical slots. This separation of function from complex structure allows the synchronous rotation capability to be maintained while the overall structure is significantly simplified and thinned.
Solution Approach 2:
The patent employs thin-film-like structural elements such as the slider component with helical slots and the slender rotating rods, which provide the necessary mechanical constraints and motion transmission in a minimal thickness profile, enabling structure simplification and device thinning.
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
This design simplifies the structure of the rotating mechanism, reducing its thickness and improving the stability and reliability of foldable electronic devices while enabling seamless folding and unfolding.
Implementation Method 1
the first rotating rod is provided with a first helical slot, the second rotating rod is provided with a second helical slot
Data Source
AI summary
A rotating mechanism and a foldable electronic device are provided. The rotating mechanism includes a fastening base and a synchronous component-which includes a first synchronous swing arm, a second synchronous swing arm, a first rotating rod, a second rotating rod, and a slider. The first and the second rotating rods are mounted side by side and in parallel to the fastening base, both of them can rotate relative to the fastening base, and the slider is located between the first rotating rod and the second rotating rod and slidably connected to the first rotating rod and the second rotating rod. The first synchronous swing arm and the second synchronous swing arm are respectively located on opposite sides of the fastening base, and the first synchronous swing arm is fixedly connected to the first rotating rod, and the second synchronous swing arm is fixedly connected to the second rotating rod.