Synchronous Hinge Gear Assembly for Foldable Device Auto-Opening

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Solution Overview

Problem

Foldable electronic devices face challenges with large rotational virtual spaces and require manual operation when electricity is not input, leading to inconvenient user experiences, especially when transitioning between fully folded and fully unfolded states.

Innovation Solution

An automatic synchronous hinge device with coupled output shafts driven by a gear group, featuring a base, driving assemblies, gear transmission assemblies, and hinge assemblies, allowing synchronized opening and closing through synchronized movement of swing arms.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a motor is introduced in the hinge to enable automatic opening and closing, then the opening and closing experience is improved, but the device complexity increases

Engineering Contradiction:

Improveopening and closing experienceVSAvoidhinge structure complexity

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The patent combines two independent driving assemblies into a synchronized dual-motor system where both motors work together to drive the hinge assembly. The first and second driving assemblies are coupled through gear transmission mechanisms, allowing coordinated movement that reduces overall system complexity while maintaining automatic operation capability.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent introduces gear transmission assemblies as intermediary mechanisms between the motors and the hinge assembly. These gear groups act as mediators that translate motor rotation into synchronized hinge movement, simplifying the direct drive mechanism while enabling automatic opening and closing functionality.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Stability of the object's composition

If friction resistance and mechanical locking force are increased to stabilize the device in different folding states, then the stability is improved, but the force required for manual operation increases

Engineering Contradiction:

Improvestability in folding statesVSAvoidforce required for manual operation

Core Design Contradiction:

Stability of the object's compositionVSForce

Solution Approach 1:

The patent replaces the traditional mechanical locking system relying on friction and locking forces with an electric drive system. Motors provide the necessary force to overcome resistance and move the hinge between states, eliminating the need for high manual force while maintaining stability through controlled positioning.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the operational parameters by introducing controlled electromagnetic force from motors to replace mechanical friction-based stability. The system uses precise motor control to achieve stable positioning in different folding states without requiring high manual intervention force.

Inventive Principle:

Principle #35Parameter changes

3Adaptability or versatility

If the rotational virtual space between the first body and the second body is large, then the display flexibility is improved, but the locking force required to maintain positions increases

Engineering Contradiction:

Improvedisplay flexibilityVSAvoidlocking force required

Core Design Contradiction:

Adaptability or versatilityVSForce

Solution Approach 1:

The patent replaces mechanical locking force with electromagnetic force from motors to maintain the hinge assembly in different rotational positions. This allows for large rotational virtual space and display flexibility without requiring proportional increases in locking force, as the motors provide controlled holding capability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 device ensures synchronized and efficient opening and closing of foldable electronic devices, optimizing user experience by reducing manual effort and providing consistent speed and duration, with high integration and compact design.

Implementation Method 1

The first gear transmission assembly and the second gear transmission assembly are coupled to each other to form synchronous transmission

Methodology Applied

Scientific EffectGear transmission: Gear

Data Source

PatentUS20260064163A1Automatic synchronous hinge device and electronic device

Publication Date: 2026.03.05 AAC MICROTECH (CHANGZHOU) CO LTD

AI summary

An automatic synchronous hinge device and an electronic device includes a base, a first driving assembly, a second driving assembly, a first gear transmission assembly, a second gear transmission assembly, and a first hinge assembly. The first driving assembly and the second driving assembly are fixed to the base side by side. The first gear transmission assembly and the second gear transmission assembly are respectively connected with the first driving assembly and the second driving assembly. The first gear transmission assembly is coupled to the second gear transmission assembly to move synchronously. The first hinge assembly is mounted on the base and is driven by the first gear transmission assembly and the second gear transmission assembly to fold or unfold. The automatic synchronous hinge device achieves synchronous opening and closing on two sides, satisfying the user experience of intelligence and technology.