Dual-Cam Rotating Shaft for Foldable Hovering and Damping
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Solution Overview
Problem
Conventional damping mechanisms in foldable electronic devices struggle to adjust hand feelings during opening and closing and hovering angles effectively, as they typically rely on a single cam profile that cannot meet both requirements simultaneously.
Innovation Solution
A rotating shaft with a combination of first and second cams, each with distinct gear tooth profiles, allows for separate design of hand feeling feedback and hovering functions, ensuring smooth folding and extended hovering ranges through adjustable damping forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single cam profile is used in the damping mechanism, then the structure is simple, but the hand feeling during opening/closing and hovering angle cannot be adjusted independently
Solution Approach 1:
The single cam profile is segmented into two independent cam profiles with different damping characteristics. The first cam profile controls hand feeling during opening and closing with a smaller included angle, while the second cam profile controls hovering angle with a larger included angle. This segmentation allows independent adjustment of each function without affecting the other, resolving the contradiction between adaptability and structural simplicity.
Solution Approach 2:
The damping mechanism is designed to perform multiple functions through the combination of two cam profiles within a single rotating shaft structure. The first cam profile provides damping control for opening/closing operations, while the second cam profile provides hovering angle control, making the system universally capable of both functions simultaneously without requiring separate mechanisms.
2Reliability
If the first included angle is increased to improve hovering effect, then hovering capability is enhanced, but damping force becomes too large causing jamming
Solution Approach 1:
Different regions of the cam mechanism are assigned different included angles optimized for their specific functions. The first cam profile has a smaller included angle (0°-10°) specifically optimized for providing gentle damping during opening/closing to prevent jamming, while the second cam profile has a larger included angle (10°-35°) specifically optimized for providing strong hovering effect. This local differentiation of geometric parameters allows each region to perform its function optimally without the harmful effects of the other.
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 dual-cam design provides enhanced hand feeling feedback and hovering capabilities, preventing jamming while maintaining a consistent damping force, enabling smooth operation and extended hovering angles in foldable electronic devices.
Implementation Method 1
the first mating gear tooth is in sliding fit with the first gear tooth of one first cam, or is in sliding contact with the second gear tooth of another second cam
Data Source
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AI summary
This application provides a rotating shaft and an electronic device. The rotating shaft includes at least one damping module, where the damping module includes a mounting shaft, a rotating member, a first cam, and a second cam, the rotating member, the first cam, and the second cam are all rotatably connected to the mounting shaft, a first mating gear tooth is disposed at a first end of the rotating member, and a second mating gear tooth is disposed at a second end of the rotating member. A first gear tooth is disposed on the first cam, the first gear tooth includes a first damping part, and a first included angle exists between the first damping part and a radial direction of the mounting shaft. A second gear tooth is disposed on the second cam, the second gear tooth includes a hovering part, a second included angle exists between the hovering part and the radial direction of the mounting shaft, and the second included angle is greater than the first included angle. A mating gear tooth of the rotating member may mate with the first gear tooth or the second gear tooth. In this application, mating between the first cam and the second cam that have different profiles can simultaneously implement hand feeling feedback during opening and closing and a hovering function of the electronic device, and this is easy to design.