Modular Journal Foil Air Bearing Assembly
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Solution Overview
Problem
Conventional journal foil air bearings are difficult to assemble, disassemble, and manage due to direct mounting on bearing housings requiring precise surface processing, leading to increased costs and complexity.
Innovation Solution
A modularized journal foil air bearing design featuring a top foil, bump foil, and base foil, with a coupling unit that allows for easy assembly and disassembly, using a receiving portion and coupling holes with a coupling member for secure attachment, and a smooth base foil surface for improved tolerance and friction reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the top foil and bump foil are directly mounted on the bearing housing inner surface, then the bearing structure is simplified, but the mounting and dismounting becomes very difficult and requires additional surface processing
Solution Approach 1:
The bearing is divided into three separable foils (top foil, bump foil, base foil) that can be independently assembled and disassembled. The base foil acts as a carrier that can be mounted on the bearing housing, while the top and bump foils can be attached and removed as needed, solving the difficulty of direct mounting while maintaining structural simplicity.
Solution Approach 2:
The base foil serves as an intermediary component between the bearing housing and the top/bump foils. It provides a standardized mounting interface that simplifies installation on the housing while also serving as a carrier for the other foils, eliminating the need for direct mounting of top and bump foils on the housing surface.
2Device complexity
If the bump foil is directly mounted on the bearing housing inner surface, then the number of parts is reduced, but additional surface processing (grinding or coating) is required increasing costs
Solution Approach 1:
By separating the base foil from the top and bump foils, the mounting surface requirements are transferred only to the base foil, which is designed with a standardized smooth inner surface. This allows the top and bump foils to be manufactured independently without expensive surface processing, reducing overall manufacturing costs while maintaining a simple part structure.
Solution Approach 2:
The smooth surface finish requirement is applied locally only to the inner surface of the base foil where it contacts the bearing housing, rather than requiring surface processing of all components. This localized quality approach reduces manufacturing complexity and costs for the top and bump foils while ensuring proper function at the critical interface.
3Ease of operation
If a sleeve is added to assemble top foil and bump foil in advance, then assembly is easier and modularization is improved, but tolerance management between parts becomes more precise and difficult
Solution Approach 1:
The base foil integrates multiple functions that would otherwise require separate components: it serves as the mounting carrier on the housing, as the structural support, and as the assembly platform for the top and bump foils. This merging eliminates the need for a separate sleeve, maintaining ease of modular assembly while reducing the number of interfaces and tolerance requirements.
Solution Approach 2:
The base foil is designed as a multi-functional component that performs mounting, support, and assembly carrier functions simultaneously. Its inner surface provides a universal mounting interface for the housing while its structure enables easy attachment of the top and bump foils, achieving both assembly ease and tolerance management without requiring a separate sleeve component.
4Reliability
If welding is used to fix the top foil and bump foil, then the connection is strong and reliable, but technical uncertainty and product costs increase
Solution Approach 1:
The invention replaces welding (a thermal/chemical joining process) with mechanical attachment methods such as adhesives, clips, or interlocking features. This substitution maintains reliable connection between the foils while eliminating the technical uncertainty and cost associated with welding operations, making the manufacturing process more predictable and easier to control.
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
Enables easy assembly, disassembly, and storage of the air bearing, reducing assembly errors and costs while maintaining performance even with poor surface finishes on bearing housings, and allowing for mass production without welding.
Implementation Method 1
a bump foil which is an elastically deformable member and is located to surround the top foil
Implementation Method 2
An air bearing refers to a bearing that supports a load by lifting a rotating shaft due to the pressure of air compressed between the rotating shaft and the bearing
Implementation Method 3
when viscous gas such as air, which is moving along with a moving surface, meets a stationary surface and is compressed, the pressure of air between the moving surface and the stationary surface rises to lift upward the moving surface
Data Source
AI summary
A journal foil air beating includes: a top foil located to face an outer circumferential surface of a rotating shaft and surround the rotating shaft; a bump foil being an elastically deformable member and located to surround the top foil; a base foil located to surround the bump foil, and a coupling unit configured to couple the first end portion of the top foil, the first end portion of the bump foil, the first end portion of the base foil, and the second end portion of the base foil, wherein the base foil, the bump foil, and the top foil are modularized into one piece by the coupling unit. According to the present invention, the journal foil air bearing may be easily assembled in advance and modularized into one piece, may be very conveniently mounted or disassembled on a bearing housing in a workplace.