Oleophilic Bearing With Surface-Modified Stainless Steel

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Solution Overview

Problem

Existing bearings face challenges with inadequate mechanical load-bearing capacity, corrosion resistance, and short-term lubricant retention, often requiring frequent maintenance and being prone to failure due to lubricant loss.

Innovation Solution

A bearing with an inner and outer ring made of stainless rolling bearing steel, featuring an elemental-iron-free surface bonded with an oleophilic adhesion promoter layer, which enhances lubricant adhesion and corrosion resistance while maintaining mechanical stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Duration of action of moving object

If a lubricant layer is formed on bearing surfaces to reduce friction and wear, then the bearing lifetime is extended, but the mechanical load-bearing capacity and corrosion resistance deteriorate

Engineering Contradiction:

Improvebearing lifetimeVSAvoidmechanical load-bearing capacity

Core Design Contradiction:

Duration of action of moving objectVSStrength

Solution Approach 1:

The bearing surface is segmented into two distinct layers: a base layer of stainless rolling bearing steel providing mechanical strength and load-bearing capacity, and a surface layer with modified wettability properties (oleophobic or lipophobic coating) that retains lubricant. This segmentation allows each layer to fulfill its specific function without compromising the other.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The bearing combines two different materials or material states: the metallic base material (stainless steel) and a surface modification layer (coating or treated surface) with different wettability characteristics. This composite structure integrates the high strength of metal with the lubricant-retaining properties of the modified surface, resolving the contradiction between mechanical performance and lubricant retention.

Inventive Principle:

Principle #40Composite materials

2Reliability

If the bearing surfaces are made oleophobic to retain lubricant, then lubricant retention improves, but the corrosion resistance worsens

Engineering Contradiction:

Improvelubricant retentionVSAvoidcorrosion resistance

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The oleophobic surface treatment is applied locally only to the bearing surfaces where lubricant retention is needed (raceways and rolling element contact areas), while the rest of the bearing components maintain their original corrosion-resistant stainless steel properties. This localized application ensures lubricant retention functionality without compromising overall corrosion resistance.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

Inventive Principle:

Principle #40Composite materials

3Productivity

If maintenance intervals are extended by improving lubricant retention, then productivity improves, but the risk of bearing failure increases if maintenance is forgotten

Engineering Contradiction:

Improvemaintenance intervalVSAvoidbearing failure risk

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The oleophobic surface treatment is applied in advance during bearing manufacturing, creating a permanent lubricant-retaining property that proactively prevents lubricant loss before it becomes a problem. This preliminary action eliminates the need for frequent maintenance interventions and reduces the risk of failure due to forgotten lubrication.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The bearing surfaces are designed to automatically retain lubricant through their oleophobic properties, making the bearing self-sufficient in maintaining its lubrication state. This self-service capability reduces dependency on external maintenance activities and minimizes the risk of failure associated with improper or forgotten maintenance.

Inventive Principle:

Principle #25Self-service

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 lubricant retention and mechanical stability, extending the bearing's lifespan by at least 70% compared to standard bearings, even under conditions of irregular lubrication.

Implementation Method 1

the surface of the inner ring and/or of the outer ring is bonded to an oleophilic adhesion promoter layer of the bearing

Methodology Applied

Scientific EffectOleophilic adhesion: Adhesive

Data Source

PatentUS10024362B2Oleophilic bearing with surface-modified part made of stainless rolling bearing steel

Publication Date: 2018.07.17 GRW GEBR REINGUFT GMBH & CO KG

AI summary

In order to make a bearing, such as a roller bearing, insensitive to a lack of maintenance lubrication or irregular maintenance lubrication while at the same time retaining its mechanical performance, at least one bearing part of the bearing is provided at least partially with an oleophilic adhesion promoter layer. The adhesion promoter layer binds a lubricant layer of the bearing to the bearing part provided with the adhesion promoter layer. The adhesion promoter layer is bonded to an elemental-iron-free surface of a bearing part body. The removal of free iron from the bearing part body surface is carried out with nitric acid, chromate solution and/or citric acid. The treated bearing part has an oleophilic anti-corrosion adhesion promoter layer. The bearing may be used in pressure-operated devices, in particular in turbine handpieces used by dentists, because the loss of the lubricant layer during operation of the device was particularly high.