Nested Planetary Gear Reducer for Super High Speed Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing planetary gear reduction systems face challenges in achieving a super high speed reduction ratio while maintaining a compact and lightweight structure, making them difficult to apply to compact devices.
Innovation Solution
A planetary gear reduction device comprising a planetary gear reduction unit and an inscribed planetary gear reducer, where the input shaft module is formed by coupling two parts into one body, allowing for a super high speed reduction ratio with a compact and efficient structure, including a primary reduction sun gear, planetary gears, and a ring gear plate, along with a motor shaft connection mechanism for efficient speed reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If two planetary reduction gears are connected to achieve a super high speed reduction ratio, then the speed reduction ratio is improved, but the volume increases and it becomes difficult to apply to compact devices
Solution Approach 1:
The patent applies nesting by placing one planetary reduction gear inside another planetary reduction gear structure. The inner planetary gear system is positioned within the outer planetary gear system, allowing both reduction stages to occupy overlapping spatial volumes. This nested configuration enables achieving a super high speed reduction ratio (e.g., 1/100 or higher) while maintaining a compact overall volume that would be impossible with simple sequential connection of two separate planetary gears.
2Volume of stationary object
If the planetary reduction gear structure is made compact for application to small devices, then the volume is reduced, but the structural complexity increases
Solution Approach 1:
The patent merges multiple functional components into integrated structures. The carrier of the inner planetary gear is combined with the ring gear of the outer planetary gear, and the carrier of the outer planetary gear is combined with the housing. This merging of components reduces the number of separate parts and simplifies the overall structure while achieving compact dimensions suitable for small devices like indexers, despite the sophisticated nested gear arrangement.
3Productivity
If additional auxiliary structures are added to achieve super high speed reduction, then the speed reduction ratio is improved, but the device becomes heavier and more complex
Solution Approach 1:
The nested planetary gear configuration allows two complete planetary reduction stages to be housed within a single compact structure without requiring additional auxiliary support structures. The inner planetary gear system (with its sun gear, planetary gears, and carrier) is positioned within the outer planetary gear system, and both systems share common structural elements. This eliminates the need for separate mounting structures and reduces overall weight while achieving super high speed reduction ratios.
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
The device achieves a super high speed reduction ratio with a compact and lightweight design, enabling its application in compact devices by providing a large torque output and improved speed reduction range without the need for additional auxiliary structures.
Implementation Method 1
A planetary gear reduction device for super high speed reduction includes a planetary gear reduction unit and an inscribed planetary gear reducer
Implementation Method 2
an input shaft module, which has an end portion connected to the planetary gear reduction unit and is formed by coupling at least two parts as one body
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A planetary gear reduction device for super high speed reduction is disclosed. The planetary gear reduction device for super high speed reduction, according to one embodiment of the present invention, includes a planetary gear reduction unit providing a primary reduced speed obtained by primarily reducing a rotational speed of a motor, and an inscribed planetary gear reducer having an input shaft module, which has an end portion connected to the planetary gear reduction unit and is formed by coupling at least two parts as one body, and an output shaft module for outputting a secondary reduced speed by further reducing the primary reduced speed by an interaction with the input shaft module.