Modular Bearing Compartment With Self-Contained Lubrication
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Solution Overview
Problem
Conventional bearing compartments in gas turbine engines are integral with the engine structure, making them difficult to remove without substantial disassembly, and require complex lubrication and buffering systems, increasing size and weight.
Innovation Solution
Modular bearing compartments with detachable casings and self-contained lubrication systems, allowing for quick installation and removal without affecting fluid connections, and reducing engine size and weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional bearing compartments are made integral with the engine structure, then structural strength and stability are improved, but ease of installation and removal deteriorates
Solution Approach 1:
The bearing compartment is divided into separate modular components including a detachable casing, bearing assembly, and mounting interface. This segmentation allows the bearing compartment to be installed and removed as a self-contained unit without substantial disassembly of the engine structure, while the mounting interface maintains structural strength through flanged connections with multiple fasteners.
2Reliability
If conventional bearing compartments include integrated lubrication and buffering systems, then bearing reliability is improved, but device complexity and weight increase
Solution Approach 1:
The lubrication system, buffering system, and bearing assembly are merged into a single integrated bearing compartment module. This consolidation provides reliable lubrication and buffering functions while reducing overall device complexity compared to having separate systems for each function, as the components share common housing and mounting structures.
Solution Approach 2:
The bearing compartment casing serves multiple functions simultaneously: it houses the bearing assembly, contains the lubrication system, provides buffering support, and interfaces with the engine structure through the mounting flange. This multi-functionality reduces the number of separate components needed while maintaining reliable operation.
3Reliability
If conventional bearing compartments require fluid system connections, then lubrication effectiveness is improved, but ease of operation deteriorates
Solution Approach 1:
The lubrication system is extracted as a self-contained subsystem within the bearing compartment, with its own lubricant reservoir and delivery mechanisms. This extraction allows the bearing compartment to be installed and removed without requiring connections to external fluid systems, as the lubrication function is provided internally by the extracted subsystem.
Data Source
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AI summary
A gas turbine engine (10) includes a turbine (12) and a compressor (14) in rotational communication with the turbine via a shaft (16). The shaft is rotatable about a longitudinal centerline (18) and includes a first axial end (20, 22) and a second axial end (20, 22) opposite the first axial end. The gas turbine engine further includes a first bearing compartment (26, 28) including a first compartment casing (32) detachably mounted axially outside the compressor and the turbine. The first bearing compartment is in contact with the first axial end of the shaft and includes a first bearing (30) which rotatably supports the shaft. The first bearing compartment is self-contained such that an internal lubrication system (44) of the first bearing compartment is fluidally isolated from a remainder of the gas turbine engine outside the first bearing compartment.