Planetary Gear Carrier Centering for Stable Low-Noise Rotation
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Solution Overview
Problem
In planetary gear devices with a 'floating' carrier support structure, rotational axial deviations and precession occur due to tilt and eccentricity of the output shaft, leading to unstable carrier rotation and noise generation.
Innovation Solution
A planetary gear device design featuring a housing cover and carrier cover configuration where the carrier cover supports the planetary gear shaft, with a slide cylindrical part that slides on an inner peripheral surface, centering the carrier and reducing axial deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a floating support structure is used for the carrier, then working errors and assembling errors are accommodated and load distribution is improved, but rotational axial deviation and precession occur leading to noise
Solution Approach 1:
A centering mechanism is introduced as an intermediary component between the floating carrier support structure and the housing. This centering mechanism includes a centering member that contacts the carrier and applies corrective force to eliminate axial deviation and precession, while allowing the floating support to continue accommodating assembly errors and distributing load evenly across planetary gears.
2Adaptability or versatility
If the carrier is supported in a floating manner, then assembly errors are accommodated, but the output shaft tilt causes precession and axial deviation of the carrier
Solution Approach 1:
The centering mechanism serves as a mediator that reconciles the conflicting requirements of floating support and rotational stability. It allows the carrier to maintain its floating characteristic for error accommodation while simultaneously providing centering force to prevent precession and axial deviation caused by output shaft tilt.
Solution Approach 2:
The centering mechanism dynamically adjusts the positional parameters of the carrier during operation, correcting axial deviation and angular orientation in real-time to maintain stable rotation while preserving the floating support's adaptability to assembly variations.
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 stabilizes the carrier rotation, suppresses axial deviations, and reduces noise, ensuring quiet and stable operation by maintaining coaxial alignment of the planetary gear mechanism.
Implementation Method 1
the slide cylindrical part including an outer peripheral surface that slides on an inner peripheral surface of the opening
Data Source
AI summary
A planetary gear device includes: a housing cover disposed at one end portion of a housing in an axis direction, the housing being configured to house a sun gear and a planetary gear inside the housing; and a carrier cover disposed next to the housing cover in the axial direction in the inside, and configured to support a shaft of the planetary gear from one end portion side in the axial direction. Of a pair of opposing parts opposite to each other in the housing cover and the carrier cover, one opposing part includes an opening that opens in the axis direction, and the other opposing part includes a slide cylindrical part protruding toward inside of the opening in a coaxial manner with an axis of the opening, the slide cylindrical part including an outer peripheral surface that slides on an inner peripheral surface of the opening.