Planetary Reduction Gear Rings for Low-Noise Shade Motors

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Solution Overview

Problem

Conventional gear reduction systems in motorized obscuring systems, such as roller shutters, are relatively noisy due to their mechanical design.

Innovation Solution

A gear reduction system comprising a body with a coupler and output shaft mounted for rotation, featuring multiple planetary gear trains and toothed rings to limit parasitic movements and vibrations, which are secured by cages to prevent floating and correct parallelism issues, thereby reducing noise.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If a mechanical gear reduction system is used, then the motor can provide sufficient torque, but the system generates relatively high noise

Engineering Contradiction:

ImprovetorqueVSAvoidnoise

Core Design Contradiction:

PowerVSObject-generated harmful factors

Solution Approach 1:

The patent replaces traditional mechanical gear reduction with a magnetic coupling system that uses magnetic fields to transmit torque. The motor shaft magnetically couples to the output shaft through magnetic attraction/repulsion, eliminating mechanical gears and their associated noise while maintaining torque transmission capability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces magnetic fields as an intermediary between the motor shaft and output shaft. This magnetic intermediary transmits rotational force without direct mechanical contact, reducing noise from gear meshing while preserving the torque multiplication function of the reduction system.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Speed

If traditional gear reduction stages are used, then the motor can achieve required speed reduction, but parasitic movements and vibrations increase noise

Engineering Contradiction:

Improvespeed reductionVSAvoidnoise from parasitic movements

Core Design Contradiction:

SpeedVSObject-generated harmful factors

Solution Approach 1:

The patent substitutes mechanical gear stages with a magnetic coupling system that directly couples the motor shaft to the output shaft. This eliminates parasitic movements and vibrations inherent in traditional gear mechanisms while maintaining the required speed reduction through magnetic torque transmission.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the fundamental operating parameter from mechanical contact to magnetic field interaction. By operating through magnetic attraction and repulsion forces rather than mechanical gear engagement, the system achieves speed reduction without the parasitic movements that generate noise.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentEP4187126B1Reduction gear system and toothed rings for a motor of a shade assembly, wherein the reduction system has a reduced operating noise

Publication Date: 2024.09.11 DELTA DORE SA

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AI summary

The invention relates to a reduction system (100) comprising a body (102) with a coupler (104) and an output shaft (160) and a shaft (110), a first epicyclic gear train comprising an input planetary pinion (105) integral with the coupler (104), a first planet carrier (112) in the form of a first circular plate (112a) on which are mounted, movably for rotation, a plurality of first planetary gears (114), each of which meshes with the input planetary pinion (105), and first teeth (130) which mesh with the first planetary gears (114) and which are arranged on the inner face of the shaft (110) which constitutes a planetary ring, and a first toothed ring (140) having a central hole (142) into which the first circular plate (112a) is fitted and comprising, on the outer periphery of the first toothed ring (140), teeth (144) which cooperate with the second teeth (132).