Planetary Ring Gear Lug Design for NVH Reduction
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Solution Overview
Problem
Vibration is excessively transferred from the ring gear of a planetary gearset to the housing, leading to noise and mechanical issues in applications like transfer cases and transmissions.
Innovation Solution
Incorporating a series of lugs around the ring gear, with adjustable number, size, and shape, strategically arranged in multiple rows to reduce vibration transfer by absorbing and dissipating rotational forces effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the ring gear is directly grounded to the housing, then the structural simplicity is maintained, but the vibration transferred to the housing increases
Solution Approach 1:
The ring gear interface is segmented into multiple discrete lugs distributed around the circumference rather than a continuous ground surface. This segmentation creates isolated vibration paths that reduce the overall vibration transfer to the housing while maintaining structural simplicity.
2Object-affected harmful factors
If multiple rows of lugs are strategically arranged on the ring gear, then the vibration reduction is improved, but the manufacturing complexity increases
Solution Approach 1:
Different regions of the ring gear are equipped with lugs of varying characteristics (number, size, shape, distribution) to locally optimize vibration reduction at specific interfaces. This allows tailored vibration control without requiring complex manufacturing throughout the entire component.
Data Source
AI summary
In the present invention, an improved planetary gearset which reduces the amount of vibration transferred from the planetary gearset to a housing. The present invention is a new way to interface the ring gear of a planetary gearset with the housing by incorporating a series of lugs around the ring gear and adjusting the number of lugs and the size and the shape of the lugs. The distribution of these lugs affects the sound levels transferred from the planetary gearset. Additionally, multiple rows of lugs can also be strategically arranged on one ring gear to gain further noise and vibration improvement.