Planetary Reducer With Integrated Buffering for Overload Impact

Solution Overview

Problem

Existing overload impact protection structures for robot joints require additional components like frictional force generators, increasing manufacturing costs and volume, and are not compact.

Innovation Solution

A planetary reducer with a rigid tooth face portion and an elastically deformable buffer portion that absorbs energy during overload impacts, reducing the number of parts, manufacturing costs, and maintaining a compact structure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a frictional force generator is added to protect against overload impact, then the transmission components are protected, but the number of components increases and manufacturing cost increases

Engineering Contradiction:

Improveprotection of transmission componentsVSAvoidnumber of components

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The buffer portion is integrated into the planetary gear structure itself, merging the overload protection function with the transmission component. The buffer portion forms an integral part of the planetary gear, eliminating the need for separate frictional force generators while maintaining protection functionality.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The planetary gear structure provides its own overload protection through the buffer portion, which automatically engages during overload conditions. The structure serves its primary transmission function while simultaneously providing overload protection without requiring external protective devices.

Inventive Principle:

Principle #25Self-service

2Reliability

If a frictional force generator is added to protect against overload impact, then the transmission components are protected, but the volume of the reducer increases

Engineering Contradiction:

Improveprotection of transmission componentsVSAvoidvolume of reducer

Core Design Contradiction:

ReliabilityVSVolume of moving object

Solution Approach 1:

The buffer portion is integrated into the planetary gear structure itself, merging the overload protection function with the transmission component. The buffer portion forms an integral part of the planetary gear, eliminating the need for separate frictional force generators while maintaining protection functionality.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The buffer portion is nested within the planetary gear structure, with the buffer portion positioned inside or integrated with the gear body. This nesting approach allows the protection mechanism to occupy minimal additional space within the existing reducer volume.

Inventive Principle:

Principle #7Nested doll (Nesting)

3Reliability

If additional components are added for overload protection, then the transmission components are protected, but the manufacturing cost increases

Engineering Contradiction:

Improveprotection of transmission componentsVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The buffer portion is integrated into the planetary gear structure itself, merging the overload protection function with the transmission component. The buffer portion forms an integral part of the planetary gear, eliminating the need for separate frictional force generators while maintaining protection functionality.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The buffer portion is made from materials with specific damping properties that provide overload protection. By selecting appropriate composite or specialized materials for the buffer portion, the structure achieves both protection functionality and manufacturability without requiring complex additional components.

Inventive Principle:

Principle #40Composite materials

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 effectively protects transmission components by absorbing energy during impacts, minimizing part count, cost, and space, while being practical and feasible.

Implementation Method 1

a buffer portion capable of being elastically deformed; the buffer portion is made of a material having certain rigidity and capable of being elastically deformed under an impact force

Methodology Applied

Scientific EffectElastic deformation: Elasticity

Data Source

PatentEP4269835B1Overload impact-resistant planetary reducer, robot joint, and quadruped robot

Publication Date: 2025.07.02 HANGZHOU YUSHU TECHNOLOGY CO LTD

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AI summary

The present application discloses an overload impact-resistant planetary reducer, including a tooth face portion made of a rigid material and a buffer portion capable of being elastically deformed. The buffer portion is made of a material having certain rigidity and capable of being elastically deformed under an impact force, and is coaxially nested with the tooth face portion to form a reducer component capable of preventing overload impact. The planetary reducer is capable of being elastically deformed under the impact force, effectively absorbing energy during overload impact, thus protecting transmission parts such as gears. The structure is simple and practical. The present application further discloses an overload impact-resistant planetary reducer, a robot joint and a quadruped robot.