Dual-shaft Synchronous Motion Device with Cable Tractive Member

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Solution Overview

Problem

Existing dual-shaft synchronous motion devices for electronic products require complex configurations with through holes, spacers, friction plates, and springs to achieve synchronous motion between display and machine body modules, limiting ease of assembly and operation range.

Innovation Solution

A dual-shaft synchronous motion device utilizing a cable tractive member with rotors on each shaft, where the tractive member is wound and fixed to each rotor, allowing synchronous turning by converting torsion into smooth motion and enabling positioning when stopped, thereby eliminating the need for spacers and springs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional components (through holes, spacers, friction plates, springs) are used to achieve synchronous motion, then the motion control is reliable, but the device complexity increases and assembly becomes difficult

Engineering Contradiction:

Improvesynchronous motion controlVSAvoidnumber of components

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent combines multiple traditional components (through holes, spacers, friction plates, springs) into a single integrated tractive member structure. The tractive member functions as both the connecting element and the synchronous control mechanism, eliminating the need for separate positioning and motion control components while maintaining reliable synchronous motion between the first and second shafts.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The tractive member serves multiple functions simultaneously: it connects the first and second shafts, transmits motion between them, controls synchronous turning, and provides positioning when needed. This multi-functional design replaces the specialized functions previously handled by separate components like spacers for positioning and springs for motion control.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Manufacturing precision

If multiple components (through holes, spacers, friction plates, springs) are assembled to achieve synchronous motion, then the motion control is precise, but the ease of manufacture decreases

Engineering Contradiction:

Improvesynchronous positioning accuracyVSAvoidassembly simplicity

Core Design Contradiction:

Manufacturing precisionVSEase of manufacture

Solution Approach 1:

The patent integrates multiple manufacturing steps and components into a single tractive member that can be manufactured as one piece. This eliminates the need for separate assembly operations for installing through holes, spacers, friction plates, and springs, significantly improving ease of manufacture while maintaining the precision needed for synchronous positioning through the integrated structure's geometric design.

Inventive Principle:

Principle #5Merging (Combining)

3Use of energy by moving object

If traditional spring-based turning mechanism is used, then the energy storage and release is effective, but the device complexity increases

Engineering Contradiction:

Improveenergy storage and releaseVSAvoidmechanism structure

Core Design Contradiction:

Use of energy by moving objectVSDevice complexity

Solution Approach 1:

The patent extracts and eliminates the spring component from the traditional mechanism while retaining the essential energy storage and release function through the tractive member's elastic deformation. The tractive member itself serves as the energy storage element, removing the need for separate springs and simplifying the overall mechanism structure.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The tractive member acts as an intermediary element that transfers and transforms energy between the first and second shafts. It stores energy during one phase of motion and releases it during another, mediating the energy transfer without requiring separate spring components or complex energy storage mechanisms.

Inventive Principle:

Principle #24Intermediary (Mediator)

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

Enables a 360-degree turning angle between display and machine body modules with reduced torsion change, providing a convenient and easy operation effect by simplifying the assembly and operation mechanism.

Implementation Method 1

the torsion change of turning is decreased to the least for the first and second shafts to have a smooth turning

Methodology Applied

Scientific EffectTorsion: Torque

Data Source

PatentUS8959714B2Dual-shaft synchronous motion device

Publication Date: 2015.02.24 FIRST DOME

AI summary

A dual-shaft synchronous motion device includes a first shaft and a second shaft; a first rotor and a third rotor disposed on the first shaft and turned synchronously; a second rotor and a fourth rotor disposed on the second shaft and turned synchronously; and a tractive member disposed between the first rotor (the third rotor) and the second rotor (the fourth rotor). When the first shaft drives the first and third rotors to turn, the tractive member brings the second rotor to turn reversely relative to the first rotor. The fourth rotor makes the tractive member drive the third rotor so that the first and second shafts are turned synchronously.