Centering Projection Shaft Grounding Ring for Bearing Current Protection
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Solution Overview
Problem
Bearings in electrical machinery are susceptible to damage from electric current or charge passing through the bearing raceways, which existing grounding devices fail to adequately prevent.
Innovation Solution
An electrically conductive device with an annular conductor and support bracket, featuring centering projections, provides an alternative path for current flow, ensuring the conductor is coaxial with the shaft axis and centered about the bearing, thereby preventing damage to the raceways.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional grounding devices are used, then current can be redirected away from the bearing, but the conductor may become misaligned with the shaft axis causing uneven wear and potential damage
Solution Approach 1:
The support bracket is pre-formed with centering projections that automatically align the conductor with the shaft axis during installation, eliminating the need for complex post-installation alignment procedures and ensuring proper positioning from the outset
Solution Approach 2:
Centering projections act as intermediary elements between the support bracket and the shaft, providing a mechanical interface that ensures accurate alignment and positioning of the conductor relative to the shaft axis during assembly
2Reliability
If the conductor is positioned close to the shaft for effective current redirection, then protection improves, but the risk of direct contact and sparking increases
Solution Approach 1:
The conductor is formed as a flexible brush assembly with numerous fine conductive fibers that can conform to the shaft surface, maintaining close proximity for effective current redirection while the distributed fiber structure prevents direct contact and sparking
Solution Approach 2:
The brush conductor has a porous structure with numerous gaps between fibers, allowing it to maintain close contact with the shaft for current redirection while the open structure prevents direct metal-to-metal contact and reduces sparking risk
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 device effectively redirects electric current away from the bearing raceways, preventing damage and reducing the risk of sparking, while ensuring proper alignment and wear prevention.
Implementation Method 1
an electrically conductive path extends between the shaft and the outer member through the conductor and the support bracket
Implementation Method 2
an annular retainer with an outer rim frictionally engaged with the bore of a housing or hub
Data Source
AI summary
An electrically conductive device includes an annular conductor having a centerline and an inner radial end contactable with a shaft with an inner circumferential surface centered about the centerline. A support bracket is formed of an electrically conductive material and includes an inner annular main body with a centerline, the annular conductor being coupled with the main body such that the conductor centerline is coaxial with the bracket centerline, and at least one mounting lug extending radially outwardly from the main body and disposable against a radial mounting surface of an outer member. The mounting lug(s) include first and second centering projections located at first and second predetermined distances from the centerline and being disposable within corresponding openings in the outer member such that the centerline of the conductor is coaxial with the shaft central axis and the conductor inner circumferential surface is centered about the central axis.