Integrated Motor Speed Reducer with Eccentric Cycloid Balance

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Solution Overview

Problem

Conventional speed reducing devices with separate motor and reducer components increase volume and weight, making them unsuitable for lightweight and compact applications, and mono-cycloidal reducers suffer from dynamic balance issues at high speeds, leading to vibration.

Innovation Solution

A speed reducing device integrates a motor and a speed reducing mechanism as a single unit, using a radial-flux motor with a two-stage cycloid reducer mechanism, eliminating the need for additional connection structures and achieving dynamic balance through opposing eccentric rings and cycloid disc sets.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If the motor and reducer are connected through additional connection structures (shaft coupling or gear box), then the connection is achieved, but the volume and weight of the overall structure are increased

Engineering Contradiction:

Improveconnection capabilityVSAvoidoverall structure weight

Core Design Contradiction:

Ease of manufactureVSWeight of stationary object

Solution Approach 1:

The motor and reducer are merged into a single integrated unit where the motor shaft is directly coupled with the reducer input shaft, eliminating the need for separate connection structures like shaft couplings or gear boxes. This integration reduces the overall weight and volume while maintaining the functional connection between motor and reducer.

Inventive Principle:

Principle #5Merging (Combining)

2Ease of manufacture

Engineering Contradiction:

Improveconnection capabilityVSAvoidoverall structure volume

Core Design Contradiction:

Ease of manufactureVSVolume of moving object

Solution Approach 1:

The motor and reducer are merged into a single integrated unit where the motor shaft is directly coupled with the reducer input shaft, eliminating the need for separate connection structures like shaft couplings or gear boxes. This integration reduces the overall volume while maintaining the functional connection between motor and reducer.

Inventive Principle:

Principle #5Merging (Combining)

3Device complexity

If a mono-cycloidal set (single cycloid) is used in the reducer, then the structure is simplified, but dynamic balance cannot be maintained at high speed, resulting in high vibration

Engineering Contradiction:

Improvereducer structure complexityVSAvoidvibration

Core Design Contradiction:

Device complexityVSObject-generated harmful factors

Solution Approach 1:

The patent employs two cycloid discs with asymmetric tooth arrangements positioned at different angular locations. This asymmetric configuration creates counterbalancing forces that offset each other during rotation, maintaining dynamic balance at high speeds and reducing vibration while preserving structural simplicity.

Inventive Principle:

Principle #4Asymmetry

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

This integration reduces volume and weight, enhances rigidity, and allows for high-load operation while maintaining dynamic balance, making it suitable for applications like industrial robotic arms and power assisting devices.

Implementation Method 1

The first cycloid disc set is mounted around the first eccentric ring, and includes at least one first tooth and at least one second tooth. The second cycloid disc set is mounted around the second eccentric ring, and includes at least one third tooth and at least one fourth tooth.

Methodology Applied

Scientific EffectCycloid motion:

Implementation Method 2

The first roller assembly is arranged beside a first side of the motor, and includes a first reducer casing and plural first rollers. The plural first rollers are arranged on the first reducer casing. The second roller assembly is arranged beside a second side opposing to the first side of the motor, and includes a second reducer casing and plural second rollers.

Methodology Applied

Scientific EffectRolling friction: Roller

Data Source

PatentUS10677321B2Speed reducing device having power source

Publication Date: 2020.06.09 DELTA ELECTRONICS INC(CN)

AI summary

A speed reducing device includes a motor and a speed reducing mechanism. The motor includes a stator portion, a shaft portion and rotator portion. The rotator portion includes first and second eccentric rings. The speed reducing mechanism includes first, second and third roller assemblies and first and second cycloid disc sets. These roller assemblies include first rollers, second rollers and third rollers. The first cycloid disc set is mounted around the first eccentric ring, and includes first teeth and second teeth. The second cycloid disc set is mounted around the second eccentric ring, and includes third teeth and fourth teeth. The first teeth are contacted with the first rollers. The third teeth are contacted with the second rollers. The second teeth and the fourth teeth are contacted with the third rollers.