Eccentric Oscillation Speed Reducer With Resin-Metal Weight Balance
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Solution Overview
Problem
Existing eccentric oscillation type speed reducers are heavy due to steel components, limiting their application in weight-sensitive areas such as collaborative robots, where reduced weight and noise are desired without compromising strength and heat dissipation.
Innovation Solution
The speed reducer incorporates a metal first carrier for strength and a resin second carrier for reduced weight, along with metal and resin components strategically chosen for specific parts like the input shaft and external gear to balance strength and weight reduction, while using metal bearings for high heat dissipation and resin for heat resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If steel components are used throughout the speed reducer, then strength and heat dissipation are ensured, but weight increases significantly
Solution Approach 1:
The patent applies different materials to different components based on their specific functional requirements. Metal bearings are used where high strength and heat dissipation are critical, while resin is used for housing and gear components where extreme strength is not the primary requirement. This localized material selection optimizes the strength-to-weight ratio of the overall system.
Solution Approach 2:
The speed reducer employs a composite material architecture combining metal and resin components. The metal bearings provide structural strength and heat dissipation capabilities, while the resin housing and gears reduce overall weight. This composite approach allows the system to achieve both strength requirements and weight reduction goals simultaneously.
2Weight of moving object
If resin components are used to reduce weight, then weight is reduced, but heat dissipation capability deteriorates
Solution Approach 1:
Metal bearings are strategically positioned at critical heat generation points where friction and heat are highest. These metal components act as localized heat sinks and dissipation pathways, compensating for the lower thermal conductivity of resin components in non-critical areas. This localized thermal management enables effective heat dissipation while maintaining overall low weight.
3Weight of moving object
If resin is used for the housing and gears, then weight is reduced and noise is decreased, but manufacturing precision and durability may be compromised
Solution Approach 1:
The patent utilizes resin's specific material parameters, particularly its damping characteristics and noise absorption properties, to reduce operational noise. The material selection is optimized for specific performance parameters rather than relying on a single material for all components, allowing noise reduction while maintaining adequate manufacturing precision through targeted material properties.
Data Source
AI summary
An eccentric oscillation type speed reducer includes: an external gear which meshes with the internal gear; an eccentric body shaft which oscillates the external gear; and an input shaft bearing which supports the eccentric body shaft. The casing and the external gear are made of resin, and the input shaft bearing is made of metal.