Planetary Gear Support Ring Structure for Stable Carrier Alignment
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Solution Overview
Problem
In existing planetary gear devices, the radial support structure only supports the carrier on one side, leading to unstable gear alignment and noise during rotation, and complicates the assembly of the sun gear due to its location on the other side, making it difficult to support the carrier effectively.
Innovation Solution
A planetary gear device design that includes a support ring mounted on the outer surface of the sun gear, which is rotatable and supported by a bearing or hollow bush, facilitating the assembly and operation by guiding oil from the sun gear to the rotation support to reduce friction and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the carrier is supported only on one side using a bearing, then the structure is simple, but gear alignment becomes unstable and noise increases during rotation
Solution Approach 1:
The support function is segmented into two independent support points: one bearing supporting the carrier on one side, and another bearing supporting the carrier on the opposite side. This segmentation allows each support point to independently maintain gear alignment, resolving the contradiction between structural simplicity and alignment stability.
Solution Approach 2:
Different local qualities are applied to different regions of the carrier: a bearing is installed at the location where the sun gear is positioned, and another bearing is installed at the opposite location. This localized support ensures that gear alignment is maintained at both critical points, preventing the instability and noise that occur with single-sided support.
2Volume of moving object
If the sun gear is located on one side of the carrier, then the assembly structure is compact, but it becomes difficult to assemble the sun gear and obtain a seating surface for the bearing
Solution Approach 1:
The support structure extends into the radial dimension by installing bearings on both sides of the carrier plate. This dimensional expansion provides accessible seating surfaces for bearings on the outer periphery of the carrier, making the sun gear and bearing assembly as easy as single-sided support while maintaining compact overall volume.
Solution Approach 2:
The carrier plate serves as an intermediary structure that provides mounting surfaces for both the sun gear and bearings. By designing the carrier plate with appropriate peripheral surfaces, it mediates between the compact sun gear location and the bearing installation requirements, facilitating easy assembly without increasing overall volume.
3Device complexity
If the carrier is supported only on one side, then the bearing installation is simple, but it is difficult to support the carrier effectively
Solution Approach 1:
The carrier support function is segmented into two independent bearing installations located at opposite sides of the carrier. This segmentation provides distributed support that effectively stabilizes the carrier during rotation, resolving the contradiction between simple installation and effective support.
Solution Approach 2:
The bearing installed on the opposite side of the carrier acts as a counterbalancing support element. This opposing support structure compensates for the limitations of single-sided support, providing effective carrier stabilization while maintaining relatively simple bearing installation procedures.
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 support ring design stabilizes the carrier plate, reduces noise, and improves durability by ensuring smooth operation and uniform oil supply, enhancing the overall performance of the planetary gear device.
Implementation Method 1
a rotation support mounted on the carrier plate and supporting the support ring such that the support ring is rotatable
Implementation Method 2
The rotation support may be a bearing
Implementation Method 3
The rotation support may be a hollow bush
Data Source
AI summary
A planetary gear device may include: a carrier plate having a perforated central portion, a plurality of pinion gears rotatably mounted on the carrier plate, a sun gear inserted into the carrier plate and engaged with the pinion gears, a support ring mounted around an outer surface of the sun gear, and a rotation support mounted on the carrier plate and supporting the support ring such that the support ring is rotatable.