Grounding Brush Retention Hooks for Secure Mounting Plate Attachment
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Solution Overview
Problem
Existing grounding brush assemblies for electric motors and machines fail to securely and cost-effectively attach the grounding brush to the mounting plate, leading to potential electrical discharges and vibration due to inadequate retention mechanisms.
Innovation Solution
A grounding brush assembly with a support having a mounting portion, lateral rims, and retention portions with hooks that axially and radially secure the brush to the mounting plate, ensuring robust and inexpensive attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If tabs are formed by plastic deformation of the mounting plate, then the brush is retained on the mounting plate, but the manufacturing complexity and cost increase
Solution Approach 1:
The retention mechanism is segmented into separate components: the mounting plate with its simple bore structure, and the support with integrated retention hooks. This divides the complex plastic deformation operation into a simpler plate fabrication and a separate support component that provides the retention function through pre-formed hooks.
Solution Approach 2:
The support component with retention hooks is designed as a separate, potentially simpler-to-manufacture part that can be produced more economically than complex plastic-deformed tabs. The hooks provide reliable retention without requiring expensive forming operations on the mounting plate itself.
2Reliability
If the brush support is securely attached to the mounting plate, then electrical discharges are prevented, but the device complexity increases
Solution Approach 1:
The retention hooks are merged with the support structure as an integrated feature rather than separate components. This combining of retention function with the support body simplifies the overall device by eliminating additional fasteners or attachment mechanisms while maintaining secure electrical contact.
Solution Approach 2:
The retention hooks are designed to automatically engage with the mounting plate bore and secure the support in place through self-retention. The hooks provide both mechanical retention and electrical conductivity without requiring additional securing operations or complex assembly steps.
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 provides a secure, cost-effective attachment of the grounding brush to the mounting plate, reducing electrical discharges and vibrations by maintaining the brush and mounting plate at the same electrical potential, thus protecting the rolling bearing components.
Implementation Method 1
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
at least one retention hook extending the mounting part radially outwardly and interacting with the mounting plate so as to axially retain the support of the brush with respect to the mounting plate
Data Source
AI summary
A grounding brush assembly includes a brush and a mounting plate, the brush including a support and conductive fibers disposed within the support. The support includes a mounting portion, first and second lateral rims extending from the mounting portion and axially gripping the fibers, and at least one retention portion extending the first lateral rim. The retention portion includes a mounting part extending in a bore of the mounting plate and at least one retention hook extending radially outwardly from the mounting part and interacting with the mounting plate. The at least one retention hook is located axially on a side of the mounting plate opposite to the first lateral rim.