Planetary Gear Housing With Linear Contact Vibration Isolation
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Solution Overview
Problem
Planetary gear devices experience noise and vibration due to the transmission of vibrations from the inner gear to the housing, despite previous attempts to mitigate this through separate structural units, as the contact area between the inner gear and housing remains significant, leading to ongoing noise production.
Innovation Solution
The implementation of separate structural units for the inner gear and housing, featuring raised portions on both components that create a gap and limit movement through linear contact, reducing the contact area and thereby minimizing vibration transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the inner gear and housing are formed with fitting shapes that enable contact, then the inner gear is supported within the housing, but the contact area becomes significant and vibrations are readily transmitted from the inner gear to the housing, producing noise
Solution Approach 1:
The patent applies local quality by creating specific localized contact regions (raised portions on the inner gear contacting recessed portions on the housing) rather than broad surface contact. This concentrates the support function in specific areas while maintaining gaps in other areas, thereby reducing overall vibration transmission while preserving support stability.
Solution Approach 2:
The patent segments the contact interface into discrete raised portions on the inner gear and corresponding recessed portions on the housing. This segmentation creates multiple isolated contact points rather than continuous contact, which reduces the total contact area and minimizes vibration transmission pathways while maintaining adequate support.
2Object-generated harmful factors
If the inner gear and housing are kept separate with a gap between them, then vibration transmission is reduced, but the inner gear requires additional structures to limit its movement within the housing
Solution Approach 1:
The patent merges the movement limitation function with the vibration isolation structure by integrating raised portions on the inner gear and recessed portions on the housing. These features simultaneously serve to limit radial movement of the inner gear and provide controlled contact points that reduce vibration transmission, eliminating the need for separate movement limitation mechanisms.
Solution Approach 2:
The raised portions and recessed portions serve multiple functions: they limit radial movement of the inner gear, provide controlled contact points for vibration isolation, and maintain the gap structure for noise reduction. This multi-functionality reduces the need for additional components and simplifies the overall device structure.
Data Source
AI summary
Separate structural units for an inner gear and a housing of a planetary gear device include an inner gear with a first raised portion formed on the outer peripheral surface of the inner gear, where the first raised portion extends towards in a direction that is inclined with respect to the axial direction of the inner gear. A housing includes a second raised portion formed on an inner peripheral surface, where the second raised portion extends in a direction that is inclined in respect to the axial direction. The housing contains the inner gear such that there is a gap formed between the inner peripheral surface of the housing and the outer peripheral surface of the inner gear. Movement of the inner gear within the interior of the housing is limited through linear contact of the first raised portion and the second raised portion.