Planetary Gear Reducer Layout for Sun Gear Alignment Stability
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Solution Overview
Problem
Conventional drive devices with two-stage planetary gear trains experience misalignment of the second-stage sun gear, leading to vibration and uneven output torque due to the separation of the sun gears, which affects the central axis alignment.
Innovation Solution
The output device incorporates a speed reduction mechanism with vertically arranged planetary gear mechanisms, where the sun gear of the upper planetary gear mechanism is recessed to accommodate the motor shaft, ensuring proper alignment and support through bearings, thereby stabilizing the rotation and reducing misalignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the second-stage sun gear is formed apart from the first-stage sun gear, then the speed reduction mechanism can be compact, but the transmitted torque causes misalignment of the second-stage sun gear from the central axis
Solution Approach 1:
The patent applies nesting by placing the second-stage sun gear inside the first-stage sun gear, with the second-stage sun gear positioned concentrically within the first-stage sun gear. This nested arrangement allows both sun gears to share the same central axis while maintaining a compact overall structure, thereby resolving the contradiction between compact size and alignment precision.
2Device complexity
If the second-stage sun gear is formed apart from the first-stage sun gear, then the structure can be simplified, but vibration of the output rotation and unevenness of the output torque occur
Solution Approach 1:
By nesting the second-stage sun gear within the first-stage sun gear and ensuring concentric arrangement, the patent achieves both structural simplification and smooth output rotation. The nested configuration reduces the number of separate components while the precise concentric positioning eliminates vibration and torque unevenness, simultaneously addressing both structural complexity and reliability.
Solution Approach 2:
The patent applies equipotentiality by ensuring that the second-stage sun gear is positioned at the same potential level (concentric position) relative to the central axis as the first-stage sun gear. This equipotential arrangement ensures uniform torque distribution and smooth rotation, preventing vibration and unevenness while maintaining structural simplicity.
Data Source
AI summary
A motor section including a motor shaft extending along a central axis extending vertically, and a speed reduction mechanism disposed on an upper part of the motor section and connected to the motor shaft are included. The speed reduction mechanism includes a plurality of planetary gear mechanisms arranged side by side vertically along the central axis. In the planetary gear mechanisms vertically adjacent to each other, the shaft having the sun gear of the upper planetary gear mechanism includes a recess recessed axially on the lower end surface. The upper end of the shaft having the sun gear of the lower planetary gear mechanism is disposed in the recess via a bearing.