Backup Bearing Pivoting Joint for Resonance Control
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Solution Overview
Problem
Existing backup bearing arrangements are not adequately designed to handle forces due to weight and acceleration in the event of a main bearing failure, particularly a magnetic bearing, leading to potential resonance and disruption during shaft operation.
Innovation Solution
A backup bearing arrangement with a joint that allows pivoting, featuring a slot in the housing with non-cylindrical walls and a preferred tilting axis orthogonal to the rotational axis, enabling flexibility and tilting to absorb radial and tilting forces, and potentially eccentric slot arrangements to compensate for shaft bending.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rigid housing is used to hold the backup bearing, then the bearing structure is stable and easy to manufacture, but it cannot absorb radial and tilting forces effectively, leading to force spikes and resonance during shaft runout
Solution Approach 1:
The housing is designed with a joint that enables dynamic pivoting motion relative to the backup bearing outer ring. This allows the housing to adapt its orientation dynamically during shaft runout, absorbing radial and tilting forces through controlled movement rather than rigid resistance, thereby reducing force spikes while maintaining structural integrity
Solution Approach 2:
The joint is designed with a preferred tilting axis orthogonal to the rotational axis, changing the mechanical parameters of force transmission. This orientation allows the housing to pivot optimally under load, converting harmful radial and tilting forces into controlled rotational motion around the preferred axis, reducing resonance and force spikes
2Adaptability or versatility
If the backup bearing is fixed rigidly in the housing, then the structure is simple and stable, but it cannot compensate for shaft bending and handle acceleration forces, leading to disruption during operation
Solution Approach 1:
The joint between the housing and backup bearing outer ring is designed to permit pivoting motion, transforming the rigid fixed connection into a dynamic adaptable connection. This enables the backup bearing to follow shaft displacement and tilting movements while maintaining proper loading conditions, enhancing adaptability without excessive complexity
Solution Approach 2:
The joint is designed with a preferred tilting axis orthogonal to the rotational axis, creating an asymmetric pivot configuration. This asymmetric design provides optimal adaptability to specific force directions (radial and tilting forces) while constraining unnecessary degrees of freedom, achieving versatility with controlled complexity
3Strength
If a slot with cylindrical walls is used in the housing, then the manufacturing is simple, but it does not provide adequate spring path for force absorption, leading to load spikes
Solution Approach 1:
The slot walls are designed with non-cylindrical geometry, changing the geometric parameters from simple cylinders to tapered or contoured surfaces. This modification creates an effective spring path that progressively engages during shaft runout, absorbing forces more gradually and reducing load spikes while remaining manufacturable through standard machining processes
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 solution effectively reduces load spikes and supports controlled shaft runout by allowing displacement and limited tilting, suppressing resonance and ensuring smooth operation when the main bearing fails.
Implementation Method 1
the area close to the bearing can be pivoted together with the outer ring of the backup bearing relative to the area away from the bearing
Implementation Method 2
the slot has at least one non-cylindrical wall... the joint has a defined tilting axis... enabling flexibility and tilting to absorb radial and tilting forces
Data Source
AI summary
The invention relates to a bearing arrangement including a backup bearing (2), which is provided as a safety device in addition to a main bearing. A joint (12) is formed between an outer ring (3) of the backup bearing (2) and a housing (4) surrounding same.