Rolling Bearing Outer-Ring Coating for Creep Resistance Without Antimony Oxide
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Solution Overview
Problem
Existing rolling bearings face challenges with creep resistance due to the use of antimony oxide in coating films, which is toxic and difficult to handle, leading to issues with handling and safety.
Innovation Solution
A rolling bearing with a surface coating film containing a binder of two or more kinds of thermosetting resins and a solid lubricant comprising molybdenum disulfide, PTFE resin, and graphite, which provides superior creep resistance and handling properties without using antimony oxide.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a coating film containing antimony oxide is used to prevent creep, then wear resistance and durability are improved, but handling safety deteriorates due to toxicity
Solution Approach 1:
The patent removes antimony oxide from the coating film composition entirely and replaces it with non-toxic solid lubricants including molybdenum disulfide, PTFE resin, and graphite. This extraction of the harmful substance while maintaining the creep prevention function through alternative materials directly resolves the contradiction between reliability and toxicity.
Solution Approach 2:
The patent changes the chemical composition parameters of the coating film by substituting antimony oxide with a combination of solid lubricants having different friction characteristics. This parameter change maintains or improves creep resistance while eliminating toxicity, allowing the coating to achieve both reliability and safety.
2Weight of moving object
If the wall of the raceway ring is thinned for downsizing, then weight is reduced, but creep resistance deteriorates
Solution Approach 1:
The patent applies a specialized coating film with specific local properties (low friction, wear resistance) to the outer surface of the thinned raceway ring. This local quality enhancement at the critical interface allows the bearing to maintain creep resistance despite the overall weight reduction from thinning the raceway ring wall.
Solution Approach 2:
The patent uses a composite coating film containing multiple solid lubricants (molybdenum disulfide, PTFE resin, graphite) combined with a binder. This composite material structure provides superior creep resistance that compensates for the reduced structural thickness of the raceway ring, enabling weight reduction without sacrificing reliability.
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 proposed solution achieves low friction, superior wear resistance, and improved handling properties, effectively preventing creep and reducing the risk of wear on mating materials, while ensuring safety due to the absence of toxic substances.
Implementation Method 1
a solid lubricant. The solid lubricant contains molybdenum disulfide, polytetrafluoroethylene (PTFE) resin, and graphite
Implementation Method 2
a binder containing two or more kinds of thermosetting resins having different average molecular weights
Data Source
AI summary
A rolling bearing 1 includes an inner ring 2 and an outer ring 3 that are raceway rings, and a plurality of balls 4 interposed between the inner ring and the outer ring. The outer ring 3 is fitted to a housing 10. The rolling bearing 1 includes a surface coating film 8 on an outer ring outer diametrical surface 3a that is a fitting surface with the housing 10. The surface coating film 8 contains: a binder containing two or more kinds of thermosetting resins having different average molecular weights; and a solid lubricant. The solid lubricant contains molybdenum disulfide, polytetrafluoroethylene resin, and graphite.