Thrust Ring Friction Damper for Nested Shaft Torsional Vibration
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Solution Overview
Problem
Torsional vibration between nested shafts leads to equipment fatigue and undesired rotational speed fluctuations in systems like drive trains and transmissions.
Innovation Solution
A vibration damping assembly with a thrust journal bearing and thrust washer mechanism, coupled with a biasing mechanism to create frictional engagement, dampens relative motion between nested shafts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If nested shafts are coupled to transmit kinetic energy, then power transmission is achieved, but torsional vibration occurs causing equipment fatigue and rotational speed fluctuations
Solution Approach 1:
A vibration damping assembly is introduced as an intermediary component between the first and second shafts. This assembly includes a thrust journal bearing, thrust washer, and biasing mechanism that creates frictional engagement to dissipate torsional vibrations while allowing the shafts to transmit kinetic energy, thereby preventing equipment fatigue without compromising power transmission capability
2Stability of the object's composition
If nested shafts are rigidly coupled, then structural stability is improved, but torsional vibration is amplified causing equipment fatigue
Solution Approach 1:
The coupling between shafts is made dynamic rather than rigid through the vibration damping assembly. The biasing mechanism applies a variable friction force that adapts to vibration conditions, providing structural stability during normal operation while actively damping torsional vibrations to prevent equipment fatigue
3Reliability
If a vibration damping mechanism is added between nested shafts, then torsional vibration is reduced, but device complexity increases
Solution Approach 1:
The vibration damping assembly utilizes a nested structure where the thrust washer is positioned within the thrust journal bearing, and the biasing mechanism is integrated within the same assembly. This nested arrangement dampens torsional vibrations effectively while minimizing the overall space occupied and reducing the apparent complexity of the added components
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 vibration, preventing continuous oscillation and maintaining stable rotational speed.
Implementation Method 1
A biasing mechanism is operably coupled to disconnect shaft to bias the thrust washer into frictional engagement with the thrust journal bearing
Data Source
AI summary
A system includes a rotor shaft rotatable about an axis, a disconnect shaft nested at least partially within an interior of the rotor shaft, and a journal shaft selectively rotatably coupled to the disconnect shaft. A vibration damping mechanism is arranged between the rotor shaft and the journal shaft. The vibration damping mechanism includes a thrust journal bearing affixed to the rotor shaft and a thrust washer mounted to the journal shaft. A biasing mechanism is operably coupled to disconnect shaft to bias the thrust washer into frictional engagement with the thrust journal bearing.