Eccentric Speed Reducer Bearing Structure for Heat and Rigidity

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Solution Overview

Problem

Conventional eccentric oscillation speed reducers face challenges in achieving both weight reduction and rigidity enhancement, leading to potential deformation and malfunction due to temperature rise, especially when using resin parts.

Innovation Solution

The speed reducer incorporates an internal gear with outer pins made of a thermally conductive material and a casing made of resin, with one sliding surface of the main bearing made of a thermally conductive material more wear-resistant than resin, enhancing rigidity and heat dissipation while maintaining a reduced size and weight.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Weight of moving object

If resin parts are used to reduce weight, then weight reduction is achieved, but strength and heat dissipation deteriorate

Engineering Contradiction:

Improveweight of speed reducerVSAvoidstrength of parts

Core Design Contradiction:

Weight of moving objectVSStrength

Solution Approach 1:

The patent employs composite materials by combining resin (for weight reduction) with metal components (for strength and heat dissipation). Specifically, the casing is made of resin while the carrier includes metal rings that form sliding surfaces with the resin casing, creating a hybrid structure that leverages the advantages of both materials.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent applies local quality by making only specific components resin (casing and certain carrier parts) while keeping other components metal (rings forming sliding surfaces). This localized material selection optimizes weight reduction in non-critical areas while maintaining strength and thermal properties where needed.

Inventive Principle:

Principle #3Local quality

2Weight of moving object

If resin parts are used to reduce weight, then weight reduction is achieved, but heat dissipation deteriorates

Engineering Contradiction:

Improveweight of speed reducerVSAvoidheat dissipation

Core Design Contradiction:

Weight of moving objectVSTemperature

Solution Approach 1:

The patent uses composite materials to address heat dissipation by combining resin (lightweight) with metal rings (thermally conductive). The metal rings form sliding surfaces that provide thermal pathways for heat dissipation while the resin casing maintains overall lightweight structure.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The metal rings act as intermediary elements between the resin casing and the internal components, providing a thermal bridge that facilitates heat transfer from the high-friction sliding surfaces to the external environment, thereby improving heat dissipation without requiring the entire structure to be metal.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Weight of moving object

If many resin parts are used to achieve weight reduction, then weight reduction is achieved, but reliability deteriorates due to deformation and malfunction

Engineering Contradiction:

Improveweight of speed reducerVSAvoidreliability of speed reducer

Core Design Contradiction:

Weight of moving objectVSReliability

Solution Approach 1:

The patent employs composite materials to enhance reliability by combining resin (for weight reduction) with metal rings (for dimensional stability and wear resistance). The metal rings provide structurally critical sliding surfaces that maintain reliability under load and temperature conditions.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent applies local quality by selectively using metal rings at critical sliding surface locations where reliability is most important, while using resin in non-critical areas for weight reduction. This localized reinforcement ensures reliability without compromising the overall weight reduction goal.

Inventive Principle:

Principle #3Local quality

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 configuration improves rigidity and heat dissipation, preventing failures and ensuring reliable operation by effectively dissipating heat and maintaining structural integrity.

Implementation Method 1

the other of the inner and outer sliding surfaces is made of a thermally conductive material that is more wear-resistant than the resin

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 2

One of the inner and outer sliding surfaces is made of resin

Methodology Applied

Scientific EffectFriction: Friction

Data Source

PatentUS12416347B2Speed reducer

Publication Date: 2025.09.16 NABTESCO CORP

AI summary

A speed reducer relating to one aspect of the present disclosure includes: an internal gear having a casing and a plurality of outer pins, where the casing surrounds a main axis, and the outer pins are rotatably arranged in pin grooves provided on an inner periphery of the casing; an external gear meshing with the internal gear; an eccentric body for oscillating the external gear; a carrier rotatable relative to the casing; and a main bearing having an inner sliding surface and an outer sliding surface, where the inner sliding surface is rotatable integrally with the casing, and the outer sliding surface is rotatable integrally with the carrier. One of the inner and outer sliding surfaces is made of resin, and the other of the inner and outer sliding surfaces is made of a thermally conductive material that is more wear-resistant than the resin.