Floating Seal Bearing Assembly for Thermal Misalignment
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Solution Overview
Problem
Conventional seal configurations in bearing assemblies are ineffective in elevated temperature applications due to thermal gradients and misalignment, leading to contamination and reduced operational life, and existing solutions like encasing covers complicate construction, increase costs, and hinder maintenance.
Innovation Solution
A floating seal arrangement is implemented, where a shield captures a sliding floating seal adjacent to either the outer or inner ring, allowing it to maintain sealing engagement even with component misalignment, using materials and coatings suitable for high-temperature environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional seal configurations are used in bearing assemblies, then the bearing assembly can be constructed with simple structure, but the seal becomes ineffective in elevated temperature applications due to thermal gradients and misalignment, leading to contamination
Solution Approach 1:
The seal is designed to float and move dynamically within the bearing assembly, allowing it to self-adjust and maintain sealing contact despite thermal expansion, contraction, and misalignment. This dynamic capability enables the seal to accommodate changing geometric relationships between bearing components under elevated temperature conditions while maintaining effective contamination barrier function.
Solution Approach 2:
The seal configuration allows for changes in physical parameters such as position, orientation, and contact pressure in response to thermal and mechanical conditions. The seal can shift position and adjust its sealing interface parameters to maintain effectiveness despite thermal gradients and misalignment, transforming from a static to an adaptive sealing solution.
2Reliability
If encasing covers are provided to mitigate contamination, then seal effectiveness may be marginally improved, but the construction and installation of the bearing assembly is complicated and costs increase
Solution Approach 1:
The sealing function is extracted from the complex encasing cover system and integrated directly into the bearing assembly structure itself. The floating seal is positioned within the bearing components, eliminating the need for external protective covers while maintaining contamination protection. This integration simplifies the overall device structure and reduces the number of separate components required.
Solution Approach 2:
The floating seal serves multiple functions simultaneously: it provides contamination protection, accommodates thermal expansion and misalignment, and integrates with the bearing assembly structure. This multi-functional design eliminates the need for separate encasing covers, reducing device complexity while maintaining or improving reliability.
3Object-affected harmful factors
If encasing covers are used to protect the bearing assembly, then contamination may be reduced, but routine maintenance and service are impeded
Solution Approach 1:
The bearing assembly is segmented into modular components with the floating seal integrated into the bearing structure itself rather than requiring an encasing cover. This segmentation allows the seal and bearing components to be accessed, inspected, and serviced independently without removing protective covers, improving maintenance accessibility while maintaining contamination protection.
4Force
If radial and axial forces act on the bearing assembly, then the bearing assembly can support loads, but the forces tend to misalign bearing assembly components, resulting in misalignment of the seal
Solution Approach 1:
The floating seal is designed to move dynamically in response to misalignment caused by radial and axial loads. Rather than requiring perfect static alignment, the seal can shift its position and orientation to maintain effective sealing contact under varying load conditions. This dynamic adaptation allows the bearing assembly to maintain both load bearing capacity and seal alignment stability simultaneously.
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 floating seal effectively prevents contaminants from entering the bearing assembly, maintaining performance and extending operational life by accommodating thermal and structural misalignment without complicating construction or maintenance.
Implementation Method 1
elevated temperatures can result in thermal gradients within the bearing assembly and cyclical heating and cooling of the bearing assembly, which in turn cause the various components of the bearing assembly to expand and contract at different rates due to non-uniform coefficients of thermal expansion
Implementation Method 2
a floating seal is slidably engaged with the shield and the other ring
Data Source
AI summary
The bearing assembly concept includes a floating seal arrangement. In one form, a bearing assembly comprises a first bearing member and a second bearing member that is oriented adjacent to the first bearing member. A plurality of bearings is positioned between the first bearing member and the second bearing member. A shield is engaged with the first bearing member, and a floating seal is slidably engaged with the shield and the second bearing member. The shield captures the floating seal adjacent to the second bearing member.