Plain Bearing Coating and Sealing for Relubrication-Free Corrosion Protection
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Solution Overview
Problem
Radial spherical plain bearings require regular relubrication to prevent corrosion and ensure service life, but initial greasing without relubrication lacks sufficient corrosion protection and dirt protection, reducing service life.
Innovation Solution
A newly built plain bearing with an initial greasing and anti-corrosion coating, including anti-friction lacquer or chemical nickel layers, combined with a phosphate layer on the sliding surfaces, and a seal to maintain the greasing and prevent contaminants, ensuring long-term corrosion protection and reduced relubrication needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If initial greasing is introduced during manufacture, then relubrication during service life is unnecessary, but corrosion protection is insufficient
Solution Approach 1:
The patent applies preliminary action by introducing initial greasing during manufacture before the bearing enters service. This preliminary lubrication reduces friction and wear from the start, eliminating the need for relubrication during service life and reducing maintenance requirements.
Solution Approach 2:
The patent uses composite materials by combining multiple protective layers: an initial greasing layer containing corrosion-inhibiting additives, a grease collar that forms during operation, and anti-corrosion coatings on sliding surfaces. This multi-layer composite structure provides both long-term corrosion protection and sustained lubrication without relubrication.
2Reliability
If regular relubrication is performed, then corrosion protection is maintained, but additional maintenance and operational challenges arise
Solution Approach 1:
The patent implements self-service by designing a bearing that maintains its own lubrication and corrosion protection without external intervention. The initial greasing contains corrosion-inhibiting additives that are released over time, and a grease collar forms automatically during operation to protect against dirt and corrosion, eliminating the need for manual relubrication and maintenance.
3Ease of operation
If no relubrication is performed, then maintenance is reduced, but the protective effect from grease collar is omitted
Solution Approach 1:
The patent applies preliminary action by introducing initial greasing during manufacture that contains corrosion-inhibiting additives. This preliminary lubrication not only reduces friction but also provides immediate corrosion protection, compensating for the absence of a grease collar that would normally form through regular relubrication.
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 combination of initial greasing and anti-corrosion coatings extends the service life of plain bearings by providing long-term corrosion protection and reducing wear, while the seal ensures the greasing remains effective, eliminating the need for frequent relubrication and enhancing durability.
Implementation Method 1
at least one of the sliding surfaces includes an anti-corrosion coating
Implementation Method 2
an initial greasing is introduced into the intermediate space
Implementation Method 3
combined with a phosphate layer on the sliding surfaces
Data Source
AI summary
A newly built plain bearing has an inner ring and an outer ring each having a sliding surface along which the rings are movable relative to each other. The sliding surfaces are spaced from each other by an intermediate space that holds an initial greasing, and at least one of the sliding surfaces includes an anti-corrosion coating.