Bearing Damper Sleeve With Stiffening Ring for Housing Extension
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Solution Overview
Problem
In gas turbine engine designs, the dimensional requirements for the damper often do not match the existing bearing housing, limiting the ability to incorporate a sufficient damper surface, necessitating costly and time-intensive new housing designs.
Innovation Solution
A thin cylindrical sleeve is designed to be press-fit into the bearing housing, extending beyond its surface, featuring a ring portion for added stiffness, a seal receiver, anti-rotation features, and oil feed/drain holes to support an extended active damper surface, allowing reuse of existing housing designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a thin cylindrical sleeve is press-fit into the bearing housing to extend the damper surface, then the damper surface can be extended beyond the housing limits, but the sleeve lacks sufficient stiffness to maintain structural integrity
Solution Approach 1:
The sleeve incorporates a ring portion with increased wall thickness at a specific location along its length. This local thickening provides enhanced stiffness and structural support at the critical region where the sleeve extends beyond the housing, while maintaining a thin overall profile to achieve the required extension length.
Solution Approach 2:
The sleeve is designed as a segmented structure with different wall thicknesses - a thinner main body for flexibility and extension, and a thicker ring portion for localized stiffness. This segmentation allows the sleeve to simultaneously achieve both extension and structural integrity.
2Length of moving object
If the bearing housing is redesigned to accommodate the damper dimensional requirements, then adequate damper surface can be incorporated, but the design process becomes costly and time-intensive
Solution Approach 1:
The bearing assembly is divided into separate modular components: the existing housing and a detachable sleeve component. This segmentation allows the sleeve to be designed and manufactured independently with the required extension features, while the existing housing can be reused without costly redesign.
Solution Approach 2:
The sleeve acts as an intermediary component that bridges the gap between the existing housing and the required damper surface extension. It provides the additional length and functionality without requiring modification to the original housing design.
3Length of moving object
If the sleeve extends beyond the housing surface to provide adequate damper surface, then the damper functionality is improved, but the sleeve becomes more prone to mechanical distortion
Solution Approach 1:
The ring portion with increased wall thickness is positioned at the critical extension region of the sleeve, providing localized reinforcement where the sleeve is most vulnerable to distortion. This maintains overall structural stability while preserving the extended damper surface functionality.
Solution Approach 2:
The ring portion is designed into the sleeve structure before assembly, providing pre-reinforcement at the vulnerable extension region. This preliminary structural enhancement prevents mechanical distortion during operation rather than attempting to correct it afterward.
Data Source
Figure 1
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Figure 4
AI summary
A sleeve (20) for a bearing damper comprising a cylinder shaped body (22) having a forward end (24) opposite an aft end (26), the body (22) including an interior surface opposite an exterior surface (30), the body (22) configured insertable between a bearing proximate the interior surface and a housing proximate the exterior surface (30); a ring portion (32) proximate the forward end (24), the ring portion (32) having an outer diameter (36) larger than a diameter (38) of the body (22); and an extension portion (40) configured to provide an active damper surface extending beyond the housing.