Grounding Brush Assembly With Tool-Access Orifices for Easy Dismantling
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Solution Overview
Problem
Existing grounding brush assemblies for electric motors are difficult to dismantle due to their force-fitted design, which complicates maintenance and replacement, and do not effectively address the issue of electrical discharges and vibrations caused by shaft currents.
Innovation Solution
A grounding brush assembly with a mounting plate featuring radial and centering portions, including orifices that allow for easy tool insertion and axial pulling, facilitating dismantling, and a reinforcing folded-down portion for increased mechanical strength, while maintaining effective electrical conductivity through conductive fibers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the grounding brush assembly is force-fitted into the bore of the casing, then the grounding brush assembly is securely retained, but the grounding brush assembly becomes difficult to dismantle
Solution Approach 1:
The mounting plate is segmented into a body portion and a centering portion that can be separated. The centering portion is detachable from the body portion, allowing the grounding brush assembly to be dismantled into components for maintenance while maintaining secure retention during operation.
Solution Approach 2:
The centering portion is extracted as a separate detachable component from the mounting plate body. This extracted portion can be removed independently to facilitate dismantling of the grounding brush assembly from the casing bore while the body portion remains secured.
2Reliability
If the grounding brush assembly is force-fitted into the casing bore, then the assembly is securely mounted, but maintenance and replacement are complicated
Solution Approach 1:
The mounting plate is divided into separable portions, enabling the grounding brush assembly to be disassembled into manageable components for easier maintenance and replacement while maintaining secure mounting during operation.
Solution Approach 2:
The mounting plate transitions from a static force-fitted structure to a dynamic assembly where the centering portion can be detachably removed. This dynamic capability allows the assembly to be securely mounted during operation but easily dismantled for maintenance.
3Manufacturing precision
If the centering portion radially surrounds the support, then proper positioning is achieved, but dismantling remains difficult without access points
Solution Approach 1:
The centering portion is extracted as a detachable component from the mounting plate body, creating access points for tool insertion. This allows the centering portion to provide precise radial positioning during operation while being removable for maintenance.
Solution Approach 2:
The permanent mechanical force-fit connection is replaced with a detachable mechanical connection for the centering portion. This substitution maintains precise positioning functionality while enabling easy dismantling through tool access via the detachable design.
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 enables easy dismantling and maintenance of the grounding brush assembly while effectively reducing electrical discharges and vibrations by maintaining the same electrical potential between the shaft and casing, thus protecting the rolling bearing components.
Implementation Method 1
The grounding brush is generally mounted in the bore of the casing of the electric motor such that the free ends of the fibers are in radial contact with the outer surface of the rotary shaft. Due to the conductivity of the fibers, the brush is maintained at the same electrical potential as the casing of the electric motor.
Implementation Method 2
the orifice allows the insertion of a tool to readily dismantle the assembly, the tool notably making it possible to axially pull on the mounting plate by exerting an effort on the side opposite the casing
Data Source
AI summary
A grounding brush assembly includes a brush and a brush mounting plate, the brush being provided with a plurality of conductive fibers and a support inside which the conductive fibers are housed, the mounting plate being secured to the support and provided with at least one radial portion extending radially outwardly with respect to the support. At least one centering portion extends at least axially from the radial portion and is spaced radially apart from and partially surrounding the support. Further, at least one orifice is formed in the centering portion, the orifice being spaced a distance apart from the proximal end of the centering portion and a distance apart from the distal end of the centering portion.