Bearing Cage Damping Ring for Turbine Vibration Control
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Solution Overview
Problem
Turbine machine roller bearings face premature damage due to mechanical fatigue and deformation caused by vibration excitations, which existing vibration damping means fail to adequately address, especially under high rotation speeds and low power dissipation constraints.
Innovation Solution
An annular bearing cage with a vibration damping ring is introduced, housed in an external rim that extends around the central axis, allowing the damping ring to rotate with the cage and absorb deformation modes through friction, minimizing cage deformation and maintaining reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the working cross-section and rail cross-section of the bearing cage are increased to prevent excessive deformation, then the cage resistance to mechanical deformation is improved, but the ability to evacuate lubrication oil deteriorates
Solution Approach 1:
The bearing cage is divided into multiple functional components: the structural cage body with rails for mechanical strength, and a separate vibration damping ring with damping elements for vibration absorption. This segmentation allows each component to be optimized independently - the cage structure for strength and oil flow, and the damping ring for vibration control without interfering with lubrication evacuation pathways
Solution Approach 2:
The vibration damping ring acts as an intermediary element between the cage structure and the sources of vibration. It absorbs vibrational energy through its damping elements (such as viscoelastic materials or friction-based mechanisms) before these vibrations can cause mechanical fatigue to the cage structure, thereby protecting the cage without requiring increased structural mass that would block oil flow
2Adaptability or versatility
If the size of rolling elements is increased to circumvent lubrication evacuation limitations, then the lubrication constraint is bypassed, but the reliability of the roller bearing under low load operation deteriorates
Solution Approach 1:
The invention replaces the purely mechanical approach of increasing rolling element size with a vibration damping mechanism. Instead of relying on larger rolling elements to handle all operational conditions, the damping ring provides a non-mechanical (or semi-mechanical) solution using material damping properties, friction, or energy dissipation mechanisms to control vibrations, thereby maintaining reliable operation across all load conditions without compromising lubrication evacuation
3Reliability
If known vibration damping means are used to dampen cage vibrations, then some vibration damping is achieved, but the damping effectiveness is insufficient to prevent premature deterioration
Solution Approach 1:
The vibration damping ring employs specific material parameters and geometric parameters optimized for maximum damping effectiveness. This may include using materials with high loss factors (viscoelastic materials), optimizing the thickness and distribution of damping elements, or designing friction interfaces with appropriate coefficients. These parameter optimizations ensure that the damping ring can effectively absorb vibration energy across the relevant frequency range, providing sufficient protection against premature cage deterioration
Solution Approach 2:
The damping ring may utilize composite material structures combining different materials with complementary properties - such as combining viscoelastic damping materials with rigid structural materials, or using layered composite structures. This allows the damping ring to simultaneously provide vibration damping, structural integrity, and resistance to the harsh operating environment of turbine engine bearings, achieving damping effectiveness that simple homogeneous materials cannot provide
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 damping ring effectively reduces mechanical deformation and extends the service life of the bearing cage by dissipating energy and maintaining the reliability of the roller bearing under operational stresses, without compromising lubrication oil evacuation or bearing performance.
Implementation Method 1
relative micro-movements may occur in the damping ring in its housing, and these micro-movements can create mechanical damping of deformation modes of the cage as a result of the coefficient of friction between the ring and the cage
Data Source
AI summary
An annular bearing cage for a roller bearing of a turbine machine rotating shaft is provided. The bearing cage includes a vibration damping ring corresponding to deformation modes of the bearing cage, and at least one external rim. The external rim includes an at least partially annular housing that extends around a central axis of the bearing cage. The damping ring is located in the housing.