Multilayer Dry Coating for Grease-Free Contact Mechanisms
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Solution Overview
Problem
Mechanical drive systems in electrical switching apparatuses rely on grease lubrication, which has limitations such as temperature sensitivity, degradation due to pollution and aging, leading to increased maintenance needs and potential operational failures.
Innovation Solution
A multilayer coating comprising a base layer, a metal-Graphene and Related Materials (GRM) composite layer, and a metallic top layer is applied to contact surfaces, providing dry lubrication and reducing the need for grease, enhancing corrosion resistance and maintaining lubrication stability across varying temperatures and environmental conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If grease lubrication is used in mechanical drive systems, then friction is reduced and mechanical wear is minimized, but the system requires regular maintenance due to grease degradation, thickening, and pollution
Solution Approach 1:
The patent extracts the lubricating function from grease and implements it through a dry coating system applied directly to contact surfaces. The coating contains lubricating particles that provide continuous lubrication without requiring external grease application, thereby eliminating maintenance needs while maintaining reliable lubrication.
Solution Approach 2:
The coating system is self-service in that it automatically provides lubrication through its inherent structure. The lubricating particles are embedded in the coating matrix and continuously supplied to contact surfaces during operation, eliminating the need for external maintenance interventions.
2Speed
If grease is used for lubrication, then initial friction reduction is achieved, but grease thickens due to aging and low temperatures leading to increased static friction and operation time
Solution Approach 1:
The patent changes the physical state of the lubricant from bulk grease to embedded particles within a coating matrix. This parameter change allows the lubricating material to maintain consistent properties across temperature ranges and over time, preventing thickening and maintaining operational speed throughout the service life.
3Reliability
If grease lubrication is applied, then mechanical wear is reduced, but the system becomes susceptible to particle pollution and temperature-related degradation
Solution Approach 1:
The patent uses composite materials by embedding lubricating particles within a coating matrix that is applied to the substrate. This composite structure protects the lubricating particles from pollution while the coating itself provides environmental resistance to temperature and chemical degradation, maintaining wear resistance without susceptibility to external harmful factors.
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 multilayer coating provides stable, low-friction operation with reduced maintenance requirements, improving corrosion resistance and maintaining lubrication effectiveness over time, thus minimizing operational disruptions and maintenance needs.
Implementation Method 1
at least one of the first and second contact surfaces is provided by a coating directly on a surface of a metallic substrate of the part to provide dry lubrication
Implementation Method 2
the composite layer consisting of particles of a Graphene and Related Materials (GRM) material in a metal matrix
Implementation Method 3
depositing a base layer arrangement on a surface of the substrate by electrodeposition whereby the metal ions are deposited to form a metallic base layer arrangement
Data Source
AI summary
A mechanism comprising a plurality of parts of which a first part comprises a first contact surface and a second part comprises a second contact surface arranged to move in relation to, and in contact with, the first contact surface. The first contact surface is provided by a multilayer coating directly on a surface of a metallic substrate of the first part. The multilayer coating comprises: a base layer arrangement arranged directly on the surface of the substrate; a composite layer arranged on top of the base layer arrangement, the composite layer consisting of particles of a Graphene and Related Materials (GRM) material in a metal matrix; and a metallic top layer arranged directly on top of the composite layer.