Gear-Synchronized Hinge Structure for Stable Frictional Torque
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Solution Overview
Problem
Conventional hinges with gear synchronization mechanisms suffer from insufficient frictional torque due to clearance in the rotational rail, leading to a feeling of looseness and unstable shaking, which shortens the service life.
Innovation Solution
A hinge design featuring a base frame unit with elongated base seats, rotating recesses, and a bevel gear mechanism, where rotating members with bevel gear portions mesh with a bevel gear member, generating sufficient frictional torque through interference with interfering plates and arcuate rails, ensuring stable operation and reduced shaking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If clearance exists in the rotational rail of conventional hinges with gear synchronization, then the hinge structure is simple, but the frictional torque is insufficient causing looseness and unstable shaking
Solution Approach 1:
The hinge is divided into multiple independent rotating members (first rotating member and second rotating member) that rotate independently within the base seat, each with its own rotating rail. This segmentation allows each rotating member to have dedicated friction engagement surfaces, increasing the effective frictional torque while maintaining structural simplicity.
Solution Approach 2:
Rotating rails are introduced as intermediary components between the rotating members and the base seat. These rails provide controlled friction engagement through intentional clearance design, where the rotating rails contact the base seat to generate sufficient frictional torque. The rails act as mediators that convert the clearance into beneficial friction rather than harmful play.
2Ease of operation
If the hinge uses a gear synchronization mechanism, then synchronous rotation is achieved, but clearance causes feeling of looseness and reduces service life
Solution Approach 1:
The hinge employs dynamic clearance adjustment through the interaction between rotating rails and the base seat. The clearance is not fixed but dynamically optimized during rotation, allowing the rotating rails to engage with the base seat at critical positions to maximize frictional torque while maintaining smooth synchronous rotation. This dynamic engagement extends service life by reducing wear and instability.
Solution Approach 2:
The design changes the clearance parameter from a static dimension to a functional variable. By carefully controlling the clearance between rotating rails and the base seat, the system optimizes frictional torque generation. The clearance parameter is adjusted to provide just enough play for smooth rotation while ensuring sufficient contact for stability, thereby extending service life without compromising synchronous rotation capability.
3Reliability
If frictional torque is increased to reduce shaking, then stability improves, but device complexity increases
Solution Approach 1:
The rotating rails serve multiple functions simultaneously: they guide the rotation of members, generate frictional torque through controlled clearance, and enable synchronous rotation when combined with the gear mechanism. This multi-functionality increases stability without proportionally increasing complexity, as the same components perform multiple roles rather than requiring separate elements for each function.
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 design achieves stable and synchronous rotation with increased frictional torque, reducing undesired shaking and prolonging the service life of the hinge by ensuring a larger frictional area, even in compact designs.
Implementation Method 1
Each of the rotating members frictionally interferes with a respective one of the interfering plates, and has a bevel gear portion which meshes with the bevel gear member
Data Source
AI summary
A hinge includes a base frame unit and a rotating unit. The base frame unit includes a base seat having two rotating recesses and a transmitting recess, and two interfering plates respectively disposed in the rotating recesses. The rotating unit includes two rotating members respectively and rotatably disposed in the rotating recesses, and a bevel gear member disposed in the transmitting recess. Each rotating member frictionally interferes with the respective interfering plate, and has a bevel gear portion meshing with the bevel gear member. A torque generated as a result of rotation of one rotating member is transmitted through the bevel gear member to rotate the other rotating member relative to the base seat so as to make stable synchronous rotation of the rotating members.