Foldable Terminal Hinge Mechanism for Abnormal Sound Reduction
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Solution Overview
Problem
The rotating shaft mechanism in foldable terminal devices experiences abnormal sound due to collisions between parts during rotation, affecting user experience and shortening the service life of components.
Innovation Solution
A rotating shaft mechanism is designed with a centrifugal part that deviates from the axis of the rotating shaft, a limiting member that abuts against the centrifugal part, and a shaft cover assembly that moves in the thickness direction of the rotating shaft base, reducing abnormal sound by filling the gap between the accommodating groove and the centrifugal part.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the centrifugal part rotates in the accommodating groove with clearance fit, then the shaft cover assembly can move smoothly in the thickness direction, but abnormal sound is generated due to collision between parts
Solution Approach 1:
The limiting member acts as an intermediary element disposed in the accommodating groove to abut against the centrifugal part during rotation. This mediator fills the gap between the centrifugal part and the groove wall, preventing direct collision and the resulting abnormal sound, while still allowing the necessary movement of the shaft cover assembly.
Solution Approach 2:
The limiting member converts the potentially harmful clearance fit (which causes collision and noise) into a beneficial controlled contact mechanism. By deliberately introducing the limiting member to abut against the centrifugal part, the design transforms the harmful gap into a controlled interface that guides movement while preventing damaging collisions.
2Object-generated harmful factors
If a limiting member is added to abut against the centrifugal part, then abnormal sound is reduced, but the device complexity increases
Solution Approach 1:
The limiting member is applied locally only where needed - disposed in the accommodating groove at the specific location where the centrifugal part rotates. This localized solution addresses the noise problem only in the affected area without requiring complex modifications to the entire rotating shaft mechanism, thus minimizing the increase in overall device complexity.
3Object-generated harmful factors
If the limiting member is disposed in the accommodating groove, then the gap between the accommodating groove and centrifugal part is filled, but the manufacturing precision requirements increase
Solution Approach 1:
The limiting member serves as a compensatory element that copies or replicates the function of a precise fit without requiring actual high-precision manufacturing. Instead of manufacturing the accommodating groove and centrifugal part with tight tolerances, the limiting member is added to create the necessary contact interface, effectively copying the function of a precise fit through a simpler, more manufacturable solution.
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 solution effectively reduces abnormal sound and enhances the stability of the rotating shaft mechanism, thereby improving user experience and extending the service life of components.
Implementation Method 1
The centrifugal part is fixedly disposed at one end of the rotating shaft, and the centrifugal part deviates from an axis of the rotating shaft. When the rotating shaft rotates, the rotating shaft drives, by using the centrifugal part, the shaft cover assembly to move in the thickness direction of the rotating shaft base.
Implementation Method 2
The limiting member is at least partially located in the accommodating groove. The limiting member is configured to abut against the centrifugal part in rotation. When the centrifugal part rotates, the limiting member can fill at least a gap between the accommodating groove and the centrifugal part.
Data Source
AI summary
This application relates to a rotating shaft mechanism and a foldable terminal device. The rotating shaft mechanism includes a rotating shaft base, a shaft cover assembly, a rotating shaft, a centrifugal part, and a limiting member. The shaft cover assembly is disposed on a side of the rotating shaft base in a thickness direction of the rotating shaft base, and an accommodating groove is disposed in the shaft cover assembly. The rotating shaft is rotatably disposed on the rotating shaft base. The centrifugal part is fixedly disposed at one end of the rotating shaft, and the centrifugal part deviates from an axis of the rotating shaft. The centrifugal part is rotatably disposed in the accommodating groove and is in clearance fit with the accommodating groove.