Compact Hinge Friction Sleeve for Foldable Torque Stability
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Solution Overview
Problem
The challenge lies in designing a compact hinge for electronic devices that can efficiently control torque for foldable computing devices, balancing ease of operation with the ability to maintain angular positions without support, while accommodating the size reduction and weight minimization demands of modern computing technology.
Innovation Solution
A compact hinge system featuring a first and second body attachment with torque transfer posts inserted into compressive friction sleeves, which generate net torque through rotation, allowing for adjustable friction forces and torque control via a gear set, ensuring balanced operation and angular stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a compact hinge design is used to reduce device size, then the device dimensions are reduced, but the torque control capability may be compromised
Solution Approach 1:
The hinge mechanism employs nested components where the friction sleeve is positioned within the gear assembly, and torque transfer posts are integrated within the sleeve structure. This nesting allows multiple functional elements (friction control, gear transmission, torque transfer) to occupy overlapping spatial volumes, achieving compact dimensions while preserving torque control capability through the friction sleeve's adjustable compression force.
Solution Approach 2:
The hinge utilizes adjustable friction parameters through the compressive friction sleeve, which can modify the friction force between the friction sleeve and torque transfer posts. This parameter adjustment enables the compact hinge to maintain variable torque control capability across different operating conditions, resolving the contradiction between reduced size and maintained torque control reliability.
2Stability of the object's composition
If friction force is increased to maintain angular positions, then angular stability is improved, but the ease of operation deteriorates
Solution Approach 1:
The hinge employs a dynamic friction control mechanism where the compressive friction sleeve can adjust the friction force between static and dynamic states. During operation, the gear mechanism allows the user to overcome static friction and move the hinge, while in the held position, the friction sleeve maintains sufficient friction to prevent unintended movement. This dynamic adjustment resolves the contradiction between stability and ease of operation.
Solution Approach 2:
The friction sleeve acts as an intermediary element between the gear mechanism and the torque transfer posts, mediating the transition between easy operation and stable positioning. The gear teeth engage to overcome friction during movement, while the friction sleeve maintains holding force during positioning, creating a balanced intermediate state that resolves the contradiction.
3Weight of moving object
If a compact hinge structure is implemented, then device weight is reduced, but the torque adjustment capability may be limited
Solution Approach 1:
The friction sleeve serves multiple functions simultaneously: it provides friction-based torque control, acts as a structural connector between gear components, and enables adjustable torque settings through compression force modification. This multi-functionality allows the compact hinge to achieve torque adjustment capability without adding separate heavy adjustment mechanisms, resolving the contradiction between weight reduction and adaptability.
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 enables easy operation of foldable devices while maintaining angular positions, reducing device size and weight, and allowing for customizable torque settings to enhance user experience and manufacturing efficiency.
Implementation Method 1
A compressive friction sleeve includes a first torque transfer sleeve and a second torque transfer sleeve. The first torque transfer post is inserted into the first torque transfer sleeve and the second torque transfer post is inserted into the second torque transfer sleeve.
Data Source
AI summary
A compact hinge includes two body attachments, each body attachment having a torque transfer post. A compressive friction sleeve includes a first torque transfer sleeve and a second torque transfer sleeve. A first torque transfer post is inserted into the first torque transfer sleeve and a second torque transfer post is inserted into the second torque transfer sleeve. A gear set causes the first torque transfer post to rotate with the same rotational angle as the second torque transfer post.