Multi-Row Bearing Cage Structure for High-Speed Stability
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Solution Overview
Problem
Conventional multi-row rolling-element bearings with snap cages are unsuitable for high rotational speeds due to potential misalignment, vibration issues, and inadequate lubrication, limiting their application to lower speed environments.
Innovation Solution
A multi-row rolling-element bearing design featuring a cage with separate side parts and bridge elements that form pockets to receive rolling elements from two rows, allowing for increased stability, reduced vibration, and optimized axial installation space, with the option for different numbers and sizes of rolling elements to adapt to various load conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a snap cage is used to guide and retain rolling elements in multi-row bearings, then the cage can be installed after rolling elements are in place, but the cage jumps out or misaligns at higher rotational speeds
Solution Approach 1:
The cage is divided into two separate half-cages that are assembled together after the rolling elements are installed between the bearing rings. This segmentation allows the cage to be installed in a simplified manner while the subsequent joining creates a stable structure suitable for high-speed operation.
Solution Approach 2:
The rolling elements are installed between the bearing rings before the cage is assembled and attached. This preliminary arrangement of rolling elements enables the cage to be securely fastened to the rolling elements, preventing misalignment and jump-out at high rotational speeds.
2Ease of operation
If a snap cage is used to retain rolling elements, then installation is simplified, but the cage generates vibrations that affect bearing performance
Solution Approach 1:
Dividing the cage into two half-cages allows for more precise fitting and reduced gaps compared to a single snap cage. This segmentation enables better alignment and reduces vibration generation while maintaining installation simplicity.
Solution Approach 2:
The cage is constructed from vibration-damping materials or composite structures that reduce the generation and transmission of vibrations. This material selection mitigates the harmful vibrations while preserving the ease of installation advantage.
3Ease of operation
If a snap cage is used to guide rolling elements, then post-installation cage attachment is enabled, but the cage is weak and unsuitable for high rotational speeds
Solution Approach 1:
The cage is divided into two half-cages that are joined together with fastening elements. This segmented design allows for simplified installation while the joining process creates a strong, unified structure capable of withstanding high rotational speeds and loads.
Solution Approach 2:
The rolling elements are positioned between the bearing rings before the cage is assembled and secured. This preliminary arrangement allows the cage to be firmly attached to the rolling elements, significantly increasing the overall strength and stability of the bearing assembly for high-speed applications.
4Ease of operation
If the cage is designed to snap onto rolling elements from outside, then post-installation cage attachment is possible, but the axial installation space is increased
Solution Approach 1:
The cage is divided into two half-cages that can be assembled together in the axial direction after the rolling elements are installed. This segmentation allows the cage to be constructed around the existing rolling elements, minimizing the additional axial space required compared to installing a complete cage before rolling element insertion.
Data Source
AI summary
A multi-row rolling-element bearing includes first and second bearing rings and first and second rows of rolling elements therebetween. A cage between the first and second bearing rings has a first annular side part having a plurality of axially extending first bridge elements and a second annular side part having a plurality of axially extending second bridge elements connected to the first bridge elements to form bridges and to form pockets therebetween. At least one rolling element of the first row of rolling elements and at least one rolling element of the second row of rolling elements are located in each of the plurality of pockets.