Bearing Integrated Soft Grounding Device
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Solution Overview
Problem
High-speed bearings used in electric motors and generators often suffer damage from electrical currents passing through them, as existing solutions like insulators and conductive wires can be ineffective in diverting currents away from rolling elements and raceways.
Innovation Solution
Integration of a soft connected grounding device within the bearing, utilizing a conductive grease or lubricant in a separate chamber between the inner and outer rings to safely divert electrical currents, preventing damage to the rolling elements and raceways.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If insulators or conductive wires are used to prevent electrical current damage, then electrical current protection is improved, but reliability is worsened because these solutions can be ineffective in diverting currents away from rolling elements and raceways
Solution Approach 1:
A conductive grease is introduced as an intermediary substance between the inner and outer rings, filling voids and providing a reliable conductive path that effectively diverts electrical current away from rolling elements and raceways, solving the ineffectiveness of previous insulator or wire solutions
Solution Approach 2:
The patent uses a grease-based fluid medium (conductive grease) to create a reliable electrical conduction path, leveraging the fluid's ability to fill spaces and maintain continuous contact, analogous to hydraulic systems using fluid for force transmission
2Object-affected harmful factors
If hard contact grounding is used with integrated conductive wire, then electrical current grounding is improved, but device complexity increases due to additional components and assembly requirements
Solution Approach 1:
The grounding function is merged with the existing bearing structure by incorporating the conductive grease into the bearing assembly itself, eliminating the need for separate conductive wires or additional grounding components, thus reducing device complexity while maintaining effective grounding
Solution Approach 2:
The conductive grease serves multiple functions simultaneously: it provides electrical conduction for grounding, acts as a lubricant for the bearing surfaces, and fills voids within the bearing structure, eliminating the need for separate grounding components
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
Effectively grounds electrical currents without transferring them through the rolling elements, protecting the bearing components and ensuring safe operation in high-speed applications.
Implementation Method 1
A chamber is bound at least partially by the connecting ring, wherein the chamber is at least partially filled with a conductive grease or lubricant to enable electric current to travel between the outer ring and the inner ring at the connecting ring
Data Source
AI summary
A bearing includes an inner ring defining an inner raceway, an outer ring defining an outer raceway, and a plurality of rolling elements contacting the inner raceway and the outer raceway to enable relative rotation between the inner ring and the outer ring. A connecting ring is radially between and contacts the inner ring and the outer ring. A chamber is bound at least partially by the connecting ring and one of the two rings. The chamber is at least partially filled with a conductive grease or lubricant to enable electric current to travel between the outer ring and the inner ring at the connecting ring.