Multi-Group Barrel Roller Cage for High-Load High-Speed Bearings
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Solution Overview
Problem
Existing rolling bearings fail to meet the requirements of high load capacity, low mass, low friction resistance, and higher speed limits simultaneously, particularly in thrust, radial, and radial-thrust bearings.
Innovation Solution
A cage assembly design featuring multi-group barrel rollers with specific geometric and material properties, including circumferentially distributed pockets, controlled roller dimensions, and materials like metal or fiber-reinforced composites, which allows for efficient rolling contact and reduced friction, enabling compact and lightweight bearing structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If ball thrust bearings with raceways are used, then the bearing can support axial loads, but the axial size becomes larger and the load capacity is insufficient
Solution Approach 1:
The patent employs spherical rollers instead of traditional ball elements, creating a spheroidal rolling contact geometry. This curvature modification increases the contact area between rollers and raceways, thereby enhancing load capacity while maintaining a compact axial dimension. The spherical shape allows for optimized force distribution across the bearing elements.
Solution Approach 2:
The patent changes the geometric parameters of the rolling elements by using spherical rollers with specific diameter ratios and curvature radii. The relative curvature between rollers and planar raceways is optimized to increase contact area proportion, directly improving load capacity without proportionally increasing axial size.
2Force
If cylindrical roller thrust bearings are used, then the bearing can support axial loads, but the friction resistance increases and heat generation occurs, limiting high-speed operation
Solution Approach 1:
The patent replaces cylindrical rollers with spherical rollers, creating a point or line contact geometry that reduces the contact area compared to cylindrical rollers. This reduction in contact area decreases friction resistance and heat generation, enabling high-speed operation while maintaining load capacity through optimized spherical geometry and material properties.
3Force
If planar needle bearings are used, then the bearing can support axial loads, but the friction resistance is high and the speed limit is low
Solution Approach 1:
The patent replaces needle elements with spherical rollers, transforming the linear contact geometry into a rounded contact geometry. This spheroidal modification reduces friction by distributing contact stresses more effectively and minimizing sliding components, thereby increasing the speed limit while maintaining load support capability.
4Speed
If planar high-density ball thrust bearing is used, then the friction resistance is very low suitable for high-speed operation, but the unit area load capacity is relatively lower
Solution Approach 1:
The patent optimizes the geometric parameters of spherical rollers, including diameter, thickness ratios, and curvature radii, to increase the contact area between rollers and raceways. By adjusting these parameters, the bearing achieves higher unit area load capacity while preserving the low friction characteristics necessary for high-speed operation.
Solution Approach 2:
The patent employs composite material structures for the bearing components, combining materials with different properties to simultaneously achieve high load capacity and low friction. The composite construction allows for optimized surface properties that enhance contact area and load distribution while maintaining low coefficient of friction.
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 achieves a balance of high load capacity, low friction resistance, and high speed limits, making it suitable for demanding applications while reducing manufacturing and maintenance costs.
Implementation Method 1
Multi-group rollers are included, each group of which comprises multiple stacked rollers, wherein each of said rollers is a barrel roller. In each pocket, a group of said rollers is provided, and said rollers in said multi-group pockets are rollable in the cage in circumferential direction thereof.
Data Source
AI summary
A bearing cage assembly comprises multi-group rollers (2), each group has multiple rollers, and each roller is a barrel roller, multiple rollers are stacked together to form a group of rollers, and the end surfaces of each two adjacent rollers contact with each other. Multiple groups of pockets (11) are formed in the cage, and each group of pockets has multiple pockets. The pockets in any group are distributed along the circumference direction of the said cage, and a group of rollers is disposed in each pocket. Multi-group rollers can roll in circumferential direction of the cage. During the rolling process, a great number of contact points are distributed on the raceways, thus the load capacity of the bearing is improved, the friction resistance is low, suitable for the fields where high speed operation is necessary. A planar thrust bearing, a radial bearing and a conical radial-thrust bearing are provided.