Segmented Wire Bearing Cage for Roller Retention and Lubrication
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Solution Overview
Problem
Existing large-bearing cage designs face issues with weight, complexity, cost, lubricant flow obstruction, and serviceability, particularly in scaling up to extremely large sizes, where traditional pin-style and stamped-steel cages are heavy, costly, and prone to distortion, and polymer segmented cages have limitations in strength and cost-effectiveness.
Innovation Solution
A segmented bearing cage structure featuring discrete bridge elements coupled between wire support rings with tubular spacers for maintaining roller spacing and retention, allowing unobstructed lubricant flow, formed from powdered metal with optional lubricant impregnation or surface features for enhanced performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pin style cages are used to facilitate placement and retention of rolling elements, then rolling element retention is improved, but weight and complexity increase
Solution Approach 1:
The cage is divided into multiple wire arcs that are separate segments rather than a continuous complex structure. Each wire arc can be independently positioned and secured, simplifying the overall cage design while maintaining effective retention of rolling elements through the distributed segment structure.
2Reliability
If pin style cages are used for rolling element retention, then retention capability is improved, but manufacturing cost increases
Solution Approach 1:
The cage is segmented into multiple wire arcs that can be manufactured separately and assembled, reducing manufacturing complexity and cost compared to producing a single complex pin-style cage structure.
Solution Approach 2:
The design transitions from solid pin structures to wire arc structures, changing the geometric parameters and material usage to reduce manufacturing cost while maintaining retention functionality.
3Reliability
If pin style cages are used for rolling element retention, then retention is improved, but lubricant flow to critical wear surfaces is blocked
Solution Approach 1:
The wire arc segments are positioned and sized to provide retention only where needed, while leaving other areas open for lubricant flow. This localized approach allows the cage structure to fulfill its retention function without creating unnecessary obstructions to lubricant circulation.
4Ease of manufacture
If stamped-steel cage designs are modified for large bearing sizes using water jet cutting, then manufacturing feasibility is improved, but manufacturing cost and complexity increase
Solution Approach 1:
The cage is designed as multiple wire arc segments rather than a single stamped-steel piece, simplifying the manufacturing process by eliminating the need for water jet cutting, welding, and complex assembly operations required for large stamped-steel cages.
Solution Approach 2:
The design replaces the mechanical stamping and welding process with a simpler wire forming and assembly process, eliminating the need for complex manufacturing equipment and reducing manufacturing complexity.
5Ease of manufacture
If stamped-steel cage designs are modified for large bearing sizes using water jet cutting, then manufacturing feasibility is improved, but cage distortion and precision issues worsen
Solution Approach 1:
By dividing the cage into multiple wire arc segments, the design eliminates the distortion and precision issues associated with cutting and welding large stamped-steel cages, as each wire arc can be formed and assembled with greater precision and stability.
6Strength
If welding is used to assemble cage components, then structural integrity is improved, but risk of bearing damage from heat and welding spatter increases
Solution Approach 1:
The design changes the assembly method from welding to mechanical connection of wire arcs, eliminating the harmful thermal effects and spatter associated with welding while maintaining sufficient structural integrity for cage operation.
Data Source
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AI summary
A bearing cage assembly consisting of a plurality of discrete bridge elements coupled between first and second cage support wire rings having selected tensions, and conforming to the surfaces of associated rolling elements. The discrete bridge elements maintain rolling element in separation, provide rolling element retention within the bearing assembly, and function as a lubrication reservoir for grease lubricated bearings. The discrete bridge elements may be disposed between adjacent rolling elements, or may be configured to pass through axial bores of hollow rolling elements