Superhard Roller Ball Support Structure for Point Load Reliability
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Solution Overview
Problem
Roller ball assemblies in material handling and equipment applications face issues such as point loading, surface spalling, corrosion, fatigue, and contamination, leading to failure, especially in harsh environments like aerospace and downhole drilling, where existing solutions like coatings and alternative materials increase friction and are inefficient in debris clearance.
Innovation Solution
The use of superhard materials like polycrystalline diamond for support elements in roller ball assemblies, eliminating small diameter support balls and providing a higher load-bearing capacity, improved temperature resistance, and enhanced debris clearance, with the primary roller ball self-cleaning through frictional forces during engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If small diameter support balls are used to support the primary roller ball, then the assembly can handle higher loads, but the support balls are subject to point loading, surface spalling, corrosion, and fatigue loading leading to failure
Solution Approach 1:
The patent changes the material parameter of the support elements from conventional steel to superhard materials (polycrystalline diamond, cubic boron nitride, or coated variants). This material parameter change enables the support elements to withstand point loading, surface spalling, corrosion, and fatigue loading that cause failure in traditional steel support balls, while maintaining high load-bearing capacity.
Solution Approach 2:
The patent employs composite material structures including coated support elements (e.g., PDC with metal matrix, CBN with binder) that combine the hardness and wear resistance of superhard materials with the toughness and corrosion resistance of metal matrices or ceramic binders. This composite approach resolves the contradiction by providing both high strength for load-bearing and enhanced reliability through corrosion and fatigue resistance.
2Reliability
If coatings or alternative roller ball materials are used to overcome galling problems, then galling is reduced, but the increased surface contact area increases the coefficient of friction and reduces free rolling capability
Solution Approach 1:
The patent changes the surface hardness parameter by using superhard materials (polycrystalline diamond, cubic boron nitride) for the support elements. This extreme hardness change prevents galling through superior wear resistance while maintaining low friction because the superhard surfaces are extremely smooth and do not deform plastically under load, preserving free rolling capability unlike softer coated materials.
3Ease of operation
If small debris evacuation openings are used in the cup structure, then the openings do not catch or interfere with the free rolling of secondary balls, but the effectiveness in clearing contaminants from the assembly is limited
Solution Approach 1:
The patent extracts the support balls from the traditional roller ball assembly design, replacing them with fixed superhard support elements. This extraction eliminates the conflict between opening size and ball passage, allowing much larger debris evacuation openings to be implemented in the cup structure. The larger openings dramatically improve contaminant clearance effectiveness while the fixed support elements ensure unobstructed rolling paths.
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 solution results in a high-performance roller ball assembly with increased durability, reduced friction, and improved contamination handling, capable of handling higher loads and temperatures, and maintaining performance in harsh environments like downhole drilling.
Implementation Method 1
the primary roller ball self-cleaning through frictional forces during engagement
Data Source
AI summary
A roller ball assembly is provided. The assembly includes a primary roller ball supported by a support element that is composed of a superhard material. The assembly includes a cup defining a cavity within which the support element is positioned. A cap is coupled with the cup and positioned to retain the primary roller ball within the cavity. Also, a cup is disclosed for supporting roller balls. Additionally, disclosed are system and apparatus incorporating the assembly, as well as to methods of making and using the same.