Grounding Brush Mounting Plate for Easy Motor Demounting

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Solution Overview

Problem

Existing grounding brush assemblies for electric motors are difficult to dismantle and demount due to force-fitting, which can lead to damage of components and electrical discharges through rolling bearings.

Innovation Solution

A grounding brush assembly with a mounting plate featuring radial and axial portions, collars, and attachment lugs that allow for axial and circumferential play, facilitating easy dismantling by providing clearance for tool insertion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the grounding brush assembly is force-fitted into the bore of the casing, then the grounding brush is securely retained, but the assembly becomes difficult to dismantle and demount

Engineering Contradiction:

Improvesecure retention of grounding brushVSAvoiddismantling and demounting

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The mounting plate is divided into functional segments: a retention portion with tongues for securing the grounding brush, and a removal portion with collars and attachment lugs for tool engagement. This segmentation allows the same structure to provide both secure retention during operation and easy removal during maintenance.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Attachment lugs with hooks serve as intermediary elements that mediate between the mounting plate and external removal tools. These hooks provide a mechanical interface for tools to engage with the assembly, enabling controlled removal without damaging the grounding brush or casing.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If the mounting plate is designed with collars and attachment lugs for easy removal, then dismantling becomes simple, but the structure becomes more complex

Engineering Contradiction:

Improvedismantling simplicityVSAvoidmounting plate structure

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

Multiple functions are merged into a single mounting plate component: the plate provides structural support, retains the grounding brush via tongues, enables removal via collars and attachment lugs, and maintains electrical grounding through conductive material. This consolidation avoids the need for separate retention and removal mechanisms.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The mounting plate serves multiple purposes simultaneously: it acts as a structural support element, a retention mechanism for the grounding brush, a mounting interface for tool engagement, and an electrical conductor for grounding. This multi-functionality reduces the number of separate components needed.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If conductive fibers are used to ground the shaft, then electrical discharges through bearings are eliminated, but the fibers may cause vibrations and damage

Engineering Contradiction:

Improveelimination of electrical dischargesVSAvoidvibrations and component damage

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

Conductive fibers are used as a flexible grounding medium that can conform to the shaft surface. The fibrous structure provides compliant contact that reduces mechanical stress and vibrations compared to rigid conductors, while maintaining electrical conductivity for grounding protection.

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The grounding interface transitions from rigid contact to flexible fiber contact, changing the mechanical parameters of the connection. The fibers provide sufficient electrical conductivity for grounding while reducing mechanical hardness and compliance, thereby minimizing vibrations and damage to bearing components.

Inventive Principle:

Principle #35Parameter changes

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

Enables easy dismantling of the grounding brush assembly, reducing component damage and preventing electrical discharges by maintaining electrical potential equality between the shaft and casing.

Implementation Method 1

Due to the conductivity of these fibers, the brush is maintained at the same electrical potential as the casing of the electric motor

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Data Source

PatentUS12587074B2Grounding brush assembly

Publication Date: 2026.03.24 AB SKF SKF PATENT DEPARTMENT

AI summary

A grounding brush assembly includes a grounding brush and a brush mounting plate, the brush being provided with a plurality of conductive fibers and a support in which the conductive fibers are housed. The mounting plate is secured to the support and includes a radial portion extending radially outwardly with respect to the support and an axial portion extending axially from the radial portion so as to be spaced radially outwardly from and at least partly radially surrounding the support. The mounting plate also includes at least one collar extending radially outwardly from the distal end of the axial portion.