Dual-Cam Rotating Shaft for Foldable Hovering Hinges
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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 due to the use of a single cam profile, which is difficult to optimize for both functions simultaneously.
Innovation Solution
A rotating shaft with a combination of first and second cams, each with distinct gear tooth profiles, allowing for separate design of hand feeling feedback and hovering functions, where the first cam provides a gentle damping force and the second cam enables a larger hovering angle range.
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 it is difficult to adjust both hand feelings during opening and closing and hovering angle simultaneously
Solution Approach 1:
The single cam profile is segmented into two distinct cam profiles: a first cam profile for controlling hand feelings during opening and closing, and a second cam profile for controlling hovering angle. This segmentation allows each cam to be optimized for its specific function, resolving the contradiction between adaptability and complexity.
Solution Approach 2:
Different regions of the cam mechanism are assigned different functional qualities. The first cam has a profile specifically designed for damping and hand feeling control, while the second cam has a profile optimized for hovering angle control. This local differentiation enables independent optimization of each function without compromising the other.
2Adaptability or versatility
If a single cam profile controls both opening/closing hand feeling and hovering, then the structure is simple, but the hovering design is difficult to adjust
Solution Approach 1:
The cam mechanism is divided into two separate cam profiles with distinct functions. The first cam profile handles opening and closing hand feelings, while the second cam profile is dedicated to hovering angle control. This segmentation makes hovering design easily adjustable by modifying only the second cam profile without affecting the first cam's damping function.
Solution Approach 2:
The damping mechanism achieves multi-functionality by incorporating two cam profiles that work together. The first cam provides damping during opening and closing, while the second cam enables hovering control. This universal design allows a single mechanism to perform multiple functions that would otherwise require separate systems.
3Force
If the first included angle is made larger to improve hand feeling, then damping force increases, but hovering effect deteriorates
Solution Approach 1:
The damping force generation and hovering effect are segmented into two separate cam profiles. The first cam profile can be designed with a larger included angle to provide strong damping force for hand feeling, while the second cam profile is designed with appropriate geometry to ensure hovering effect. This segmentation eliminates the trade-off between damping force and hovering effect.
Solution Approach 2:
Different included angles are assigned to different cam profiles based on their specific functions. The first cam has an optimized included angle for maximizing damping force during opening and closing, while the second cam has a different included angle optimized for hovering control. This local optimization allows each component to perform its function at peak efficiency.
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 ensures smooth folding actions while providing effective hand feeling feedback and hovering effects across a wide angle range, enhancing user experience without increasing design complexity.
Implementation Method 1
a first gear tooth is disposed on the first cam, the first gear tooth includes a first damping part... the first mating gear tooth of the rotating member is in sliding fit with the first damping part on the first cam
Implementation Method 2
a second gear tooth is disposed on the second cam, the second gear tooth includes a hovering part... the second mating gear tooth of the rotating member is in sliding contact with the hovering part of the second cam
Data Source
AI summary
This application provides a rotating shaft and an electronic device. Where the rotating shaft comprises a mounting shaft, a rotating member, a first cam, and a second cam, the rotating member, the rotating member comprise a first mating gear tooth and a second mating gear tooth. 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.