Rocking Gear Speed Reducer With Overlapping Mesh Support

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Solution Overview

Problem

Conventional speed reduction mechanisms in motors with speed reducers face efficiency and compactness challenges due to load tilting issues, which require additional ball bearings to counteract falling loads, making them less efficient and larger in size.

Innovation Solution

The configuration of overlapping meshing ranges between the rocking gear and fixed gear, and between the rocking gear and output gear, allows for reduced load tilting, enabling a single bearing to handle the meshing load and achieving a more compact design by aligning the axial centers of these components on the same plane.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If two ball bearings are used to support the rocking gear, then the falling load is counteracted and reliability is improved, but the axial thickness increases and compactness deteriorates

Engineering Contradiction:

Improverocking gear support reliabilityVSAvoidaxial thickness

Core Design Contradiction:

ReliabilityVSLength of moving object

Solution Approach 1:

The patent converts the harmful falling load into a beneficial force by positioning the meshing ranges such that the falling load presses the rocking gear teeth against the fixed gear teeth, improving meshing reliability and eliminating the need for additional bearings to counteract the falling load

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

2Manufacturing precision

If the meshing ranges are positioned to avoid overlap, then manufacturing precision is easier to achieve, but speed reduction efficiency deteriorates due to falling load tilting

Engineering Contradiction:

Improvemeshing position precisionVSAvoidspeed reduction efficiency

Core Design Contradiction:

Manufacturing precisionVSProductivity

Solution Approach 1:

The patent intentionally positions the meshing ranges to overlap, converting what would normally be a harmful falling load tilt into a beneficial pressing force that enhances tooth meshing contact and improves speed reduction efficiency

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Reliability

If additional components are added to counteract falling load, then reliability is improved, but device complexity increases

Engineering Contradiction:

Improveload handling capabilityVSAvoidbearing configuration complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent eliminates the need for additional counteracting components by converting the falling load into a beneficial force through strategic meshing range positioning, thereby maintaining reliability while reducing device complexity

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent extracts and eliminates the unnecessary bearing component by redesigning the meshing configuration, removing the need for complex bearing arrangements while maintaining load handling capability

Inventive Principle:

Principle #2Taking out (Extraction)

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 enhances the speed reduction efficiency and allows for a more compact motor design by minimizing the axial thickness and eliminating the need for two ball bearings, thereby improving the motor's efficiency and compactness.

Implementation Method 1

a ball bearing (47) between the eccentric shaft (41) and the rocking gear (43)

Methodology Applied

Scientific EffectBall bearing: Ball Bearing

Data Source

PatentEP3699455B1Speed reduction mechanism and motor with speed reducer

Publication Date: 2024.10.23 MITSUBA CORP

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AI summary

Provided are a speed reduction mechanism and a motor with a speed reducer, which are highly efficient and compact. The present invention is provided with: an eccentric shaft 41 rotated about a motor axis L by the rotational force of a motor section 2 and having an outer peripheral surface 45a having a center O at a position eccentric to the motor axis L; a rocking gear 43 rotatably supported by the outer peripheral surface 45a through a ball bearing 47 and having inner teeth 50b and outer teeth 50a; a ring gear 42 having inner teeth 42a which mesh with the outer teeth 50a of the rocking gear 43 and which are concentric with the motor axis L; and an output section 44 having outer teeth 53a which mesh with the inner teeth 50b of the rocking gear 43 and which are concentric with the motor axis L. The range of meshing between the outer teeth 50a of the rocking gear 43 and the inner teeth 42a of the ring gear 42, and at least part of the range of meshing between the inner teeth 50b of the rocking gear 43 and the outer teeth 53a of the output section 44 overlap each other in a radial direction.