Bearing Ring Insulating Coating with Pore-Filled Plastic
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Solution Overview
Problem
Existing bearing rings face challenges with high-frequency current insulation due to the sensitivity and limited effectiveness of current ceramic-based electrically insulating coatings, which are prone to moisture penetration and have high dielectric constants, leading to inadequate protection against capacitive currents.
Innovation Solution
A bearing ring with a ceramic layer having a pore proportion of 10-50% filled with a plastic, where the ceramic layer can be made of oxides or nitrides, and the plastic has a lower dielectric constant than the ceramic, applied using thermal spraying and blasting treatment to enhance capacitive resistance and prevent moisture ingress, resulting in a thicker and more effective insulation layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a ceramic layer with low pore proportion (<10%) is applied to ensure moisture protection, then moisture penetration is prevented, but the dielectric constant increases and insulation performance against high-frequency currents deteriorates
Solution Approach 1:
The patent applies a composite coating structure consisting of a ceramic layer combined with a plastic layer. The ceramic layer provides moisture protection while the plastic layer with lower dielectric constant improves insulation against high-frequency currents. This composite approach allows both requirements to be satisfied simultaneously.
Solution Approach 2:
The patent creates different pore proportions in different layers of the coating. The ceramic layer has low pore proportion for moisture protection, while the overall coating structure achieves effective pore proportion between 3-15% for optimal electrical insulation. Each layer has optimized local properties to fulfill specific functions.
2Object-affected harmful factors
If the ceramic layer is made finer-grained to improve insulation, then moisture penetration is reduced, but the coating becomes more brittle and easier to peel off
Solution Approach 1:
The combination of ceramic and plastic materials creates a composite coating that reduces brittleness. The plastic component provides flexibility and adhesion while the ceramic provides moisture barrier properties, resolving the contradiction between fineness and mechanical strength.
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 significantly improves capacitive resistance and insulation performance against high-frequency currents, allowing for a thicker and less brittle coating that effectively protects bearings from capacitive currents, offering better protection than standard coatings.
Implementation Method 1
a ceramic layer (6) with pores (8) and a plastic (10) for filling the pores (8) and for forming a coating (7) on the ceramic layer (6)
Implementation Method 2
A first embodiment of the invention provides that the ceramic layer consists of an oxide, such as an aluminum oxide
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention discloses a bearing ring (1). The bearing ring, with a body (2), has an electrically insulating coating (4) made up of a ceramic layer with pores and a plastic for filling the pores and coating the ceramic layer. According to the invention, the pores have a proportion of 10 to 50% in the ceramic layer. The invention furthermore discloses an electrically insulating coating made up of a ceramic layer with pores and a plastic for filling the pores and coating the ceramic layer. The invention further still discloses a method for applying an electrically insulating coating to a body of a bearing ring.