Bearing Assembly Pin Preload Mechanism
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Solution Overview
Problem
Existing bearing assemblies, such as two-row tapered roller bearings, have complex constructions and require time-consuming and expensive installation processes, particularly in setting axial pre-loading or tensioning of inner rings, which can lead to issues like the 'run down effect' where tapered rollers migrate during initial operation.
Innovation Solution
A simplified bearing assembly design with a central axial bore and radially outward attachment bores, utilizing a pin for preload maintenance and lubricant conduits like grooves and channels to facilitate easier installation and lubrication, reducing component count and allowing for pre-assembly and centering functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional two-row tapered roller bearing design is used, then the bearing can support radial and axial loads, but the construction becomes complex and installation becomes time-consuming
Solution Approach 1:
The patent combines two separate inner rings into a single integrated inner ring structure with two bearing rows, eliminating the need for separate inner rings and reducing the number of components. This merging approach maintains the load support capability while significantly simplifying the overall construction and installation process.
Solution Approach 2:
The single inner ring structure serves multiple functions: it supports two rows of roller elements simultaneously, provides a unified mounting interface, and enables both radial and axial load support through its geometric design. This multi-functional approach reduces component count while maintaining bearing performance.
2Reliability
If traditional bearing assembly methods are used, then the bearing can be installed, but the axial pre-loading setup becomes time-consuming and expensive
Solution Approach 1:
The bearing assembly is pre-configured during manufacturing with the two roller element rows and their respective raceways precisely positioned and pre-loaded against each other. This preliminary action eliminates the need for time-consuming field adjustment of axial pre-loading, as the correct preload is already established before installation.
Solution Approach 2:
The geometric design of the single inner ring with integrated raceways automatically maintains the correct axial pre-loading through its structure. The bearing self-regulates the preload through its inherent geometry, eliminating the need for external adjustment mechanisms or complex installation procedures.
3Reliability
If traditional bearing designs are used, then the bearing can operate, but tapered rollers may migrate during initial operation causing the run down effect
Solution Approach 1:
The bearing is pre-loaded during assembly with the two roller element rows positioned and pressed against each other at the correct axial force. This preliminary anti-action counteracts the tendency of rollers to migrate during initial operation, preventing the run down effect before it can occur.
Solution Approach 2:
The bearing design incorporates dynamic self-adjustment through its geometric configuration, where the roller elements automatically maintain their correct positions relative to each other during operation. The structure allows for controlled movement that prevents migration while maintaining operational stability.
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 design simplifies handling and installation, reduces the number of components, prevents axial migration during initial operation, and ensures proper lubrication of roller bodies, enhancing operational reliability and efficiency.
Implementation Method 1
A pin extends through the central axial bore of the first inner ring and through the central axial bore of the second inner ring and forms a friction fit with the central axial bore of the first inner ring and the central axial bore of the second inner ring
Implementation Method 2
bearing assemblies having a lubricant conduit, e.g., one or more grooves, channels and/or bores, configured to supply lubricating oil, e.g., from an engine oil reservoir to the roller bodies
Data Source
AI summary
A bearing assembly includes at least one outer ring and an inner ring unit including first and second inner rings, the inner ring unit having a central, axial bore extending through the first and second inner rings, and a plurality of attachment bores for attaching the bearing assembly to a bearing carrier. A first plurality of roller bodies is disposed between the at least one outer ring and the first inner ring and a second plurality of roller bodies is disposed between the at least one outer ring and the second inner ring. A pin extends through the central axial bore of the first inner ring and through the central axial bore of the second inner ring, and the pin maintains a predetermined preload on the bearing assembly by holding the first inner ring in a fixed position relative to the second inner ring.