Bearing Inner Ring Alignment Grooves and Gauge
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Solution Overview
Problem
In high-speed bearing assemblies, misalignment between inner rings can lead to insufficient lubrication, resulting in increased temperature and reduced bearing life due to inadequate oil distribution.
Innovation Solution
The bearing alignment assembly features a forward inner ring with axial grooves of varying cross-sectional dimensions, including an alignment groove, and an aft inner ring with corresponding grooves, utilizing a gauge to ensure precise alignment and optimal lubrication by guiding lubricating fluid through radially oriented passages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If axial slots are formed on inner rings for lubrication, then lubrication is provided to bearing surfaces, but misalignment between inner rings causes insufficient lubrication to the aft inner ring
Solution Approach 1:
A gauge element is introduced as an intermediary tool during assembly to mediate the alignment between forward and aft inner rings. The gauge fits into alignment axial grooves on both rings, serving as a physical reference that ensures precise coaxial positioning, thereby eliminating misalignment issues without requiring complex manufacturing tolerances
Solution Approach 2:
Alignment axial grooves with distinctive cross-sectional dimensions are pre-formed on the inner rings during manufacturing. These grooves serve as preliminary alignment features that guide the gauge element during assembly, ensuring correct positioning before the bearing is put into service
2Ease of manufacture
If inner rings are assembled without alignment features, then assembly is simpler, but lubrication distribution becomes insufficient and temperature increases
Solution Approach 1:
The gauge element acts as a temporary intermediary tool that simplifies the assembly process by providing a straightforward alignment mechanism. Workers simply insert the gauge into the distinctive alignment grooves and assemble the rings around it, avoiding complex alignment procedures while ensuring proper lubrication flow paths are established
Solution Approach 2:
Only specific axial grooves (alignment grooves) are given distinctive cross-sectional dimensions, while other functional grooves maintain their original dimensions. This localized modification provides alignment capability without affecting the lubrication function of other grooves or complicating the overall manufacturing process
3Manufacturing precision
If alignment axial grooves with different cross-sectional dimensions are created, then alignment precision is improved, but device complexity increases
Solution Approach 1:
The solution applies local quality by modifying only specific axial grooves to have distinctive cross-sectional dimensions for alignment purposes, while leaving other grooves unchanged. This minimizes the impact on overall device complexity while achieving the alignment function
Solution Approach 2:
Alignment axial grooves are designed with asymmetric distinctive cross-sectional dimensions that differ from standard grooves. This asymmetry provides an unambiguous alignment reference that is easily identifiable during assembly, improving precision without requiring complex alignment mechanisms
Data Source
AI summary
A bearing alignment assembly comprises an outer ring. An inner ring assembly is disposed radially inwardly of the outer ring and cooperating therewith to form a roller volume. The inner ring assembly has a forward inner ring and an adjacent aft inner ring cooperating to provide an inner surface of the inner ring assembly. The forward inner ring includes axial grooves extending axially along and circumferentially spaced around a forward portion of the inner circumferential surface of the inner ring assembly. One or more of the axial grooves of the forward inner ring being an alignment axial groove having at least one cross-sectional dimension different than a corresponding cross-sectional dimension of other of the axial grooves of the forward inner ring, the aft inner ring including axial grooves extending axially along and circumferentially spaced around an aft portion of the inner circumferential surface, at least one of the axial grooves of the aft inner ring having the different cross-sectional dimension and positioned on the aft inner ring for alignment with the alignment axial groove. Rolling elements are rollingly disposed in the roller volume for relative rotational motion of the outer ring and the inner ring assembly.