Trochoid Reduction Gear With Shared Output Pins for Compact Meshing

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Solution Overview

Problem

Cycloid reduction gears have a large outer diameter size due to essential components like outer pins, curve plates, and inner pins, which limits their compactness and efficiency, especially when power is input from the output side.

Innovation Solution

The reduction gear design incorporates an inner trochoid and outer trochoid with a wavy curved surface and a rotation restriction unit, allowing the output pins to function as both outer and inner pins, reducing the outer diameter size and enabling a larger meshing ratio for smoother operation, while also allowing efficient power regeneration.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If outer pins, curve plates, and inner pins are used as essential components in cycloid reduction gear, then the reduction gear can achieve rotation speed reduction, but the outer diameter size becomes large

Engineering Contradiction:

Improverotation speed reduction capabilityVSAvoidouter diameter size

Core Design Contradiction:

PowerVSArea of stationary object

Solution Approach 1:

The patent merges the functions of outer pins and inner pins into a single output pin structure. The output pin simultaneously engages with both the outer trochoid (replacing outer pins) and the inner trochoid (replacing inner pins), eliminating the need for separate pin components and reducing the overall outer diameter size of the reduction gear.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The output pin is designed to perform multiple functions: it acts as both an outer pin and an inner pin, engaging with two different trochoids simultaneously. This multi-functional design reduces the number of components needed and compactsthe structure, directly addressing the contradiction between functionality and size.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If multiple separate pin components are used, then the reduction gear can transmit rotation movement effectively, but the device complexity increases

Engineering Contradiction:

Improverotation movement transmissionVSAvoidnumber of components

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent combines multiple pin components (outer pins and inner pins) into a single integrated output pin assembly. This merging reduces the number of discrete components while maintaining the reliability of rotation movement transmission through the wavy curved surface engagement mechanism.

Inventive Principle:

Principle #5Merging (Combining)

3Device complexity

If the reduction gear is designed for unidirectional power input only, then the structure can be simpler, but the adaptability decreases

Engineering Contradiction:

Improvestructure simplicityVSAvoidpower input direction flexibility

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The reduction gear is designed with symmetric wavy curved surfaces on both the inner and outer trochoids, allowing the output pin to engage effectively regardless of the direction of power input. This enables the device to accept power input from either the input shaft or the output shaft, providing bidirectional adaptability while maintaining structural simplicity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 results in a more compact reduction gear with improved efficiency, capable of handling power input from both the input and output sides, and reduces wear on the output pins through tapered surfaces and crowning.

Implementation Method 1

an inner trochoid that has a substantially tubular shape penetrating at both ends thereof and has a wavy curved surface formed on an inner circumferential side surface thereof; an outer trochoid that is disposed inside the tubular inner trochoid, has a substantially tubular shape penetrating at both ends thereof, and has a wavy curved surface formed on an outer circumferential side surface thereof

Methodology Applied

Scientific EffectMechanical engagement through wavy curved surfaces: Gear

Implementation Method 2

a rotation restriction unit that is designed to restrict rotation of the outer trochoid around an axis thereof

Methodology Applied

Scientific EffectMechanical constraint:

Implementation Method 3

an output pin that is pinched between the outer circumferential side surface of the outer trochoid and the inner circumferential side surface of the inner trochoid

Methodology Applied

Scientific EffectMechanical contact and revolution:

Data Source

PatentUS12158195B2Reduction gear

Publication Date: 2024.12.03 NITTAN CORP

AI summary

A reduction gear W1 that is configured to reduce a rotation speed input to an input shaft 1, and output the reduced rotation speed from an output shaft, the reduction gear including: an inner trochoid 8 that has a wavy curved surface formed on an inner circumferential side surface thereof; an inner trochoid holder 9 that is designed to hold the inner trochoid 8; an outer trochoid 3 that has a wavy curved surface formed on an outer circumferential side surface thereof; a rotation restriction unit that is designed to restrict rotation of the outer trochoid 3 around an axis thereof; and an output pin 9 that is pinched between the outer circumferential side surface of the outer trochoid 3 and the inner circumferential side surface of the inner trochoid 8.