Dual Deflection Ring Assembly for Transmission NVH Isolation
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Solution Overview
Problem
Rotating systems, such as vehicle transmissions, experience noise, vibration, and harshness (NVH) due to factors like gear meshing and shaft deflection, which are difficult to mitigate efficiently without complex sound barriers or tight tolerances.
Innovation Solution
A dual deflection ring system is introduced, featuring inner and outer deflectable rings with compressible pockets and a non-compressible reaction ring, which are positioned between rotating components to absorb and attenuate NVH through impedance mismatch and elastic deformation, allowing for wider tolerance ranges and high load protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If sound barriers are used to block NVH transfer, then NVH reduction is achieved, but device complexity increases
Solution Approach 1:
The patent uses flexible deflection rings with circumferential pockets instead of rigid sound barriers. These thin-walled elastic structures absorb vibrations through elastic deformation, achieving NVH reduction without the complexity of traditional sound barrier assemblies. The deflection rings can be简单地 installed between rotating and stationary components.
Solution Approach 2:
The patent changes the physical state and mechanical properties of the isolation component by using elastic materials with specific durometer ratings (e.g., 40-80 Shore A). The circumferential pockets are designed with specific dimensions and distributions to optimize the elastic deformation characteristics, transforming the isolation mechanism from rigid blocking to flexible absorption.
2Object-affected harmful factors
If exceedingly tight tolerances are used to minimize NVH, then NVH reduction is achieved, but manufacturing precision requirements increase and maintenance difficulty increases
Solution Approach 1:
The flexible deflection rings compensate for tolerance variations through elastic deformation. The circumferential pockets provide compliance that allows the rings to adapt to manufacturing variations and assembly tolerances, eliminating the need for exceedingly tight tolerances while still achieving effective NVH isolation.
Solution Approach 2:
The patent uses materials with controlled elastic properties (durometer 40-80 Shore A) and designs pocket geometries that provide sufficient compliance to accommodate tolerance variations. This parameter optimization allows standard manufacturing tolerances to be used while maintaining NVH reduction effectiveness.
3Device complexity
If a single deflection ring is used, then device simplicity is maintained, but NVH attenuation effectiveness is insufficient
Solution Approach 1:
The patent employs nested deflection rings where an inner deflection ring is placed inside an outer deflection ring, both between the rotating and stationary components. This nested configuration creates multiple stages of elastic deformation, significantly enhancing NVH attenuation while maintaining a compact structure that doesn't excessively increase device complexity.
Solution Approach 2:
Each deflection ring is segmented into multiple circumferential pockets (e.g., 6-12 pockets per ring), which distributes the vibration absorption across multiple independent elastic elements. When combined with multiple nested rings, this segmentation multiplies the attenuation effect, providing superior NVH reduction compared to a single solid ring.
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 dual deflection ring system effectively reduces NVH by modifying the transfer path, providing dampening and impedance mismatch, while maintaining operation within the elastic range of the rings, thus enhancing the lifespan and comfort of rotating systems.
Implementation Method 1
The two sets of pockets project radially relative to the axis of rotation and are compressible between the first component and the second component
Implementation Method 2
The dual deflection ring system effectively reduces NVH by modifying the transfer path, providing dampening and impedance mismatch
Implementation Method 3
The dual deflection ring system effectively reduces NVH by modifying the transfer path, providing dampening and impedance mismatch
Data Source
AI summary
A dual deflection ring system includes a pair of components that rotate relative to one another about an axis of rotation. One or more deflection rings are disposed between the components. The deflection ring(s) include two sets of pockets configured to provide two levels of compressibility in-series between the components. The two sets of pockets project radially relative to the axis of rotation and are compressible between the components.