Planetary Gear Carrier Support for Axial Deviation Suppression
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Solution Overview
Problem
In planetary gear devices with a 'floating' carrier support structure, high-speed rotation leads to axial deviation and destabilization of the carrier, which affects the stability and quietness of the device.
Innovation Solution
A planetary gear device design featuring a housing cover and a carrier cover with cone-shaped parts that slide along each other, ensuring the carrier and housing rotate with the same axis, thereby stabilizing the carrier's rotation and reducing axial deviation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the carrier is supported in a floating manner without a bearing, then the load distribution on planetary gears is equalized and working errors are accommodated, but axial deviation occurs during high-speed rotation and the carrier becomes unstable
Solution Approach 1:
The patent introduces a floating support structure as an intermediary element between the carrier and the housing. This floating support includes a support shaft and support bearings that allow controlled movement to accommodate assembly errors while providing sufficient support to prevent excessive axial deviation during high-speed rotation. The floating support acts as a mediator that balances the conflicting requirements of load distribution uniformity and rotational stability.
2Adaptability or versatility
If the carrier is supported through planetary gears meshing with sun gear and inner gear, then the floating support function is achieved, but axial deviation and destabilization occur at high rotation speeds
Solution Approach 1:
The patent implements a dynamic support system where the floating support structure can move axially within certain limits to accommodate assembly errors and working deviations. The support bearings are positioned to allow this controlled movement while maintaining stability at high speeds. This dynamic approach enables the system to adapt to varying operational conditions without sacrificing rotational stability.
3Stability of the object's composition
If a bearing is used to support the carrier, then rotational stability is improved, but the floating support function that equalizes load distribution is lost
Solution Approach 1:
The patent segments the support function into multiple components: the floating support structure provides the primary support while allowing movement, and the support bearings provide localized stability. This segmentation enables each component to fulfill its specific function - the floating support maintains load distribution uniformity through its movement capability, while the support bearings ensure rotational stability at high speeds.
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 design effectively suppresses rotational axial deviation of the carrier, enhancing the stability and quietness of the planetary gear device, particularly in high-speed applications.
Implementation Method 1
a sliding part configured to slide on a peripheral surface of the cone-shaped part
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. One opposing part of a pair of opposing parts opposite to each other in the housing cover and the carrier cover includes a cone-shaped part whose diameter varies in the axial direction, and the other opposing part of the pair of opposing parts includes a sliding part configured to slide on a peripheral surface of the cone-shaped part with a same axis as an axis of the cone-shaped part.