Nested Inertia Ring Damper for Broad Torsional Frequency Coverage
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Solution Overview
Problem
Viscous torsional vibration dampers have limitations in covering a broad frequency range without increasing mass and inertia, and they require multiple components for assembly, which complicates the design and functionality.
Innovation Solution
A nested configuration of multiple frequency-targeted viscous controlled inertia mass rings within a single sealed housing, where each ring can rotate independently and is separated by a viscous damping media, allowing for unique damping and spring rates, and utilizing different materials and densities to enhance performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple separate sealed cavities with inertia rings are used to cover broad frequency range, then frequency coverage is improved, but mass and inertia increase
Solution Approach 1:
The patent applies nesting by placing multiple inertia rings (first inertia ring and second inertia ring) concentrically within a single sealed cavity. The second inertia ring is positioned inside the first inertia ring, allowing both rings to rotate independently on shared bearing surfaces. This nested arrangement enables multiple frequency targets to be addressed within one cavity, eliminating the need for multiple separate cavities and reducing overall mass and inertia while maintaining broad frequency coverage.
2Adaptability or versatility
If multiple separate sealed cavities are used, then frequency coverage is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple damping functions into a single sealed cavity by combining multiple inertia rings within that one cavity. Instead of using separate cavities for each frequency target, the invention integrates the first and second inertia rings along with their respective viscous damping fluids into one unified assembly. This reduces the total number of components and simplifies the overall device structure while achieving multi-frequency damping capability.
3Device complexity
If single inertia ring is used, then device simplicity is maintained, but frequency coverage is limited
Solution Approach 1:
The patent resolves this contradiction by nesting multiple inertia rings within a single cavity rather than using one inertia ring per cavity. The concentric arrangement of the first and second inertia rings allows each ring to target different frequencies independently while sharing the same sealed environment and bearing surfaces. This maintains relative device simplicity compared to multiple separate cavities while significantly expanding frequency coverage beyond what a single inertia ring could achieve.
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 the damper to cover a broader frequency range without added mass or inertia, reduces the number of components, and allows for independent frequency resonances and unique fluid shear gaps, making it suitable for systems with multiple critical vibration frequencies and strict mass and space constraints.
Implementation Method 1
a viscous damping media substantially fills shear film spaces between the working surfaces of the inertia rings and between confronting working surfaces of the housing within the chamber
Data Source
AI summary
A torsional vibration damper with a housing defining an annular space. A cover is mounted on the housing. The cover and the housing define an annular working chamber. A first mass inertia ring is disposed inside and configured to rotated relative to the annular working chamber. A second mass inertia ring is disposed inside the annular working chamber. The second inertia mass ring is configured to rotate inside the annular working chamber independently with respect to the first inertia mass ring. A viscous damping media is disposed inside the annular working chamber. A hub is configured to extend from the housing in an axial direction. The hub is configured for attaching the damper to a crankshaft