Planetary Gear Bearing Layout to Suppress Sun Gear Rattle
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Solution Overview
Problem
Existing planetary gear reduction mechanisms suffer from unstable operation due to rattling and rotational shake of the front-stage sun gear, which is not adequately pressurized by the pressurization mechanism.
Innovation Solution
The planetary gear reduction mechanism incorporates a sun gear, internal gear, planetary gear, and a unique bearing arrangement with a pressing member to stabilize the sun gear, ensuring it is not subjected to rattling or rotational shake.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two bearings are provided close to each other in the axial direction, then the sun gear is well-supported, but the structure becomes complex and difficult to assemble
Solution Approach 1:
The pressing member is merged with the second bearing support portion, forming an integrated structure that combines the pressing function and bearing support function into a single component. This reduces the number of separate parts and simplifies the overall structure while maintaining the stability provided by two bearings.
Solution Approach 2:
The second bearing support portion serves dual functions: it supports the second bearing and houses the pressing member that applies pressure to the sun gear. This multi-functionality reduces structural complexity while achieving both support and pressurization goals.
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 enables stable operation of the planetary gear reduction mechanism by preventing rattling and rotational shake, thereby ensuring consistent performance and reduced wear.
Implementation Method 1
The second bearing support portion includes a pressing member that presses the second bearing toward a side where the first bearing is provided
Implementation Method 2
a first bearing provided on one side of the sun gear in an axial direction of the rotating shaft and rotatably supporting the rotating shaft; a second bearing provided on the other side of the sun gear in the axial direction of the rotating shaft and rotatably supporting the rotating shaft
Data Source
AI summary
A fifth ball bearing that rotatably supports a rotating shaft is provided on one side of a pinion gear in an axial direction of the rotating shaft. A sixth ball bearing that rotatably supports the rotating shaft is provided on the other side of the pinion gear in the axial direction of the rotating shaft. A carrier is provided with a bearing fixing portion that supports the fifth ball bearing immovably in the axial direction of the rotating shaft, and a bearing guide portion that supports the sixth ball bearing movably in the axial direction of the rotating shaft. The fifth and sixth ball bearings are provided so as not to be close to each other in the axial direction of the rotating shaft, and a female screw portion has a rattling adjustment member that presses the sixth ball bearing toward the side where the fifth ball bearing is provided.