Planetary Gear Structure With Roller Teeth for Low-Slip Meshing
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Solution Overview
Problem
In planetary gear devices, slippage between external and internal gears leads to reduced power transmission efficiency and increased wear, affecting the overall performance.
Innovation Solution
The design incorporates first and second internal gears with roller members as internal teeth, and first and second external gears with epitrochoid parallel curvilinear tooth profiles, which are connected to each other and supported by a rotating body, reducing friction and wear through optimized meshing and lubrication using thermally solidified grease.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional involute gears are used for meshing between external and internal gears, then the structure is simple and easy to manufacture, but slippage occurs between teeth leading to reduced power transmission efficiency and increased wear
Solution Approach 1:
The patent replaces the conventional involute gear meshing mechanism with a cam profile mechanism. The external gear teeth are designed with epitrochoid curvilinear profiles that act as cams, working with the internal gear teeth to eliminate slippage through optimized contact patterns, thereby improving power transmission efficiency while maintaining manufacturability through standardized processing methods.
Solution Approach 2:
The patent changes the geometric parameters of the gear teeth from standard involute profiles to epitrochoid curvilinear profiles. This parameter change optimizes the contact characteristics between mating teeth, reducing slippage and wear while improving power transmission efficiency. The specific curvature parameters are designed to achieve optimal meshing conditions.
2Adaptability or versatility
If multiple independent internal and external gears are used to achieve various reduction ratios, then versatility is improved, but device complexity increases
Solution Approach 1:
The patent designs the planetary gear mechanism with universal components that can achieve multiple reduction ratios. The carrier structure is designed to accommodate different gear configurations, and the epitrochoid cam profiles are optimized to work with various tooth count combinations, allowing a single mechanism design to provide multiple reduction ratios without increasing component count.
Solution Approach 2:
The patent segments the gear system into modular components (external gears, internal gears, carrier, planet holders) that can be independently configured. This segmentation allows for easy adjustment of reduction ratios by changing gear tooth counts or arrangements while maintaining the same basic mechanism structure, thus achieving versatility without proportionally increasing overall complexity.
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 power transmission efficiency, reduces wear, and allows for various reduction ratios by integrating the external and internal gears, improving durability and manufacturing efficiency.
Implementation Method 1
each of the first internal gear and the second internal gear has internal teeth which are constituted by a support body, and a rotating body rotatable to the support body
Implementation Method 2
optimized meshing and lubrication using thermally solidified grease
Data Source
AI summary
A planetary gear device includes: a first internal gear and a second internal gear, a first external gear which meshes with the first internal gear, a second external gear which meshes with the second internal gear, and an eccentric body which circumferentially moves the first external gear and the second external gear. The first external gear and the second external gear each independently have external teeth and are connected to each other to integrally rotate with each other, the first internal gear and the second internal gear each independently have internal teeth, one of the first internal gear and the second internal gear is connected to a stationary side, and the other thereof is connected to an output side, and each of the first internal gear and the second internal gear has internal teeth which are constituted by a support body, and a rotating body rotatable to the support body.