Flyweight Damper Assembly for Nested Shaft Torsional Vibration
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Solution Overview
Problem
Torsional vibration between nested shafts leads to noise generation, equipment fatigue, and undesired rotational speed fluctuations in drive trains and similar systems.
Innovation Solution
A vibration damping assembly using a collar and a cage with flyweights and support wedges that create a wedging force to pin flyweights in position, generating a frictional force to dampen torsional vibrations through centrifugal loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If nested shafts are used to transmit kinetic energy, then power transmission capability is improved, but torsional vibration occurs causing noise and equipment fatigue
Solution Approach 1:
The patent converts the harmful torsional vibrations into beneficial frictional damping forces. The flyweights experience centrifugal forces during torsional oscillations, pressing them against the shaft surface to generate friction that dissipates vibrational energy as heat, thereby converting the harmful vibration into a useful damping mechanism
Solution Approach 2:
The patent employs dynamic elements (flyweights) that change their state based on operational conditions. During normal rotation, flyweights remain stationary relative to the shaft. During torsional vibrations, centrifugal forces cause flyweights to move radially outward and press against the shaft, dynamically activating the damping mechanism only when needed
2Object-generated harmful factors
If a vibration damping assembly with flyweights is added, then torsional vibration is reduced, but device complexity increases
Solution Approach 1:
The patent places the damping assembly (cage with flyweights) inside the hollow interior of the shaft, nesting one component within another. This eliminates the need for separate external damping devices and reduces overall system complexity while maintaining effective vibration damping
Solution Approach 2:
The shaft's hollow interior serves dual purposes: structural function as a shaft and housing for the damping mechanism. The cage structure provides both structural support and mounting for the flyweights, achieving multiple functions with a single integrated design
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
Effectively reduces torsional vibrations by creating a frictional force that counteracts oscillations, thereby reducing noise and equipment fatigue.
Implementation Method 1
the at least one flyweight rotates with the at least one nested shaft about a central axis. The at least one flyweight is configured to engage an adjacent surface of the at least one nested shaft
Implementation Method 2
generating a frictional force to dampen torsional vibrations
Data Source
Figure 1
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AI summary
A vibration damping assembly (32) for use with a second shaft (26) nested within an interior of a first shaft (24) is provided including a collar (34) rotatable with the first shaft, and a cage (46) rotatable with the second shaft and having at least one window formed therein. The collar and the cage are mounted concentrically. At least one damping mechanism (60) is positioned within the at least one window. The at least one damping mechanism includes at least one flyweight and at least one support wedge. The at least one flyweight movable relative to the cage to frictionally engage an adjacent surface of the collar.