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Electrically Insulated Tapered Roller Bearings
Engineered for exceptional resilience in electrically active environments, our electrically insulated tapered roller bearings feature an integrated, high-resistance insulating layer. This layer, typically an aluminum oxide ceramic coating, is meticulously applied via plasma spraying to either the inner or outer ring, creating an impenetrable barrier to electrical currents. This structural integrity ensures the complete isolation of electrical potential, thereby eliminating the risk of electrical discharge damage to the rolling elements and raceways.
- Advanced Insulation Layer: Utilizes a thin, yet highly effective ceramic coating (e.g., aluminum oxide) offering superior dielectric strength, often exceeding 500 V DC.
- Prevention of Current Passage: Effectively blocks both AC and DC currents, preventing bearing damage such as frosting, fluting, and electrical corrosion.
- Material Compatibility: The insulation material is chemically stable and compatible with standard bearing lubricants and operating temperatures.
- Precision Manufacturing: Produced to exacting tolerances, ensuring optimal running accuracy, load carrying capacity, and consistent performance characteristic of tapered roller bearings.
- Standardized Form Factors: Designed to conform to ISO dimensions, guaranteeing interchangeability and ease of integration.
Technical Specifications
|
Parameter
|
Specification
|
|---|---|
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Bore Size Range |
Ø50 mm - Ø300 mm. Larger sizes available for customization. |
|
Interchangeability |
Strictly follows ISO dimensional standards, fully interchangeable with electrically insulated bearings from leading international brands such as SKF (INSOCOAT™), FAG (Current-Insulated), and NSK (ELINS™). |
|
Coating Location |
Available with inner ring coating, outer ring coating, or double coating, allowing flexible configuration based on insulation requirements. |
|
Cage Material |
Stamped Steel (general purpose), Brass (high temperature/high speed), Phenolic Resin/PA66 (high insulation/specific operating conditions) |
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Internal Clearance |
Available in various clearance grades such as Normal (CN), C3, C4, and customizable according to operating conditions. |
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Sealing Options |
Open, Contact Seals (RS/2RS), Non-Contact Seals (Z/ZZ). |
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Breakdown Voltage |
Typically ≥ 500 V DC. Higher breakdown voltage achievable under controlled conditions. |
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Electrical Resistance |
Typically > 50 MΩ, effectively preventing current passage. |
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Coating Material |
High-purity Aluminum Oxide (Al2O3) ceramic, offering excellent dielectric properties, high hardness, and wear resistance. |
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Coating Thickness |
Usually 100 µm - 300 µm. |
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Coating Hardness |
>1100 HV. |
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Operating Temperature |
-30°C to +120°C. Special coatings and materials can provide higher temperature resistance. |
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Standards Compliance |
Complies with international and national standards such as ISO, IEC, DIN, and GB, and is RoHS and REACH environmentally certified. |
|
Custom Solutions |
Support customization of electrically insulated bearings with special dimensions and performance requirements. Provide modification services for applying insulation coatings to existing bearings. |
Key Features & Benefits
Model Numbers
Total 2 Results
Typical Applications
Wind Turbines
Large wind turbines are critical equipment in the renewable energy sector. Their internal generator sets typically use power converters to convert unstable wind energy into electricity. However, these converters generate high-frequency harmonic currents and shaft voltages during the conversion process. These currents and voltages can easily pass through the generator bearings, leading to electrical corrosion, microscopic damage to the bearing raceways and rolling element surfaces, which in turn accelerates bearing wear and fatigue failure.
Key Benefits
- Effectively isolate shaft currents in wind turbine generators.
- Significantly reduce the frequency high-altitude maintenance.
- Improve the sustainability and economic efficiency.
Paper Machinery
Large equipment in the paper industry, such as the dryer cylinders, press rolls, and paper machines, often operates in high-temperature, high-humidity environments and is frequently driven by variable frequency motors. Under such conditions, the combination of shaft currents generated by variable frequency drives and the humid environment causes particularly severe damage to bearings. Shaft currents accelerate bearing fatigue and electrical corrosion, leading to damage on the raceway and rolling element surfaces, thereby affecting paper production quality and the continuous operation of the equipment.
Key Benefits
- Ensure continuous operation of paper production lines in hot and humid environments.
- Effectively prevent shaft currents from damaging bearings.
- Extend the lifespan of components in paper machinery.
General FAQ
Find quick answers to common inquiries about our technology, product compatibility, and ordering process.
What are the differences between TFL's bearings and similar products from international brands like SKF and FAG? Can we use them interchangeably?
Our products are fully interchangeable in size and function with electrically insulated bearings from renowned international brands such as SKF (INSOCOAT™ series), FAG (Current-Insulated series), and NSK (ELINS™ series). You can confidently choose TFL bearing products for replacement or upgrade without modifying your equipment design, enjoying equivalent or superior performance and service.
Can I modify existing or already purchased tapered roller bearings with an insulation coating?
Absolutely. TFL Bearing not only offers brand new electrically insulated bearings, but we also support professional insulation coating application services for customers' existing or specified brands and models of tapered roller bearings. Through this service, you can upgrade the electrical insulation performance of traditional bearings, thereby extending equipment life and achieving cost-effective modification.
What industry standards and environmental requirements do TFL electrically insulated tapered roller bearings comply with?
Our products strictly adhere to multiple international and industry standards, including ISO (dimensions, tolerances), IEC (electrical insulation), DIN, GB, and more. Simultaneously, we actively fulfill our environmental responsibilities, and our products comply with the RoHS Directive on the restriction of hazardous substances and the REACH Regulation for the registration, evaluation, authorization, and restriction of chemicals.
Will this insulation coating affect the load capacity or service life of the tapered roller bearing?
No, it will not. Our insulation coating is extremely thin and durable, with a hardness of approximately 1100 HV0.3. It is precisely applied to the bearing rings, effectively blocking current passage without altering the bearing's fundamental geometric dimensions or mechanical properties. This not only maintains the tapered roller bearing's inherently excellent load capacity but also significantly extends its actual service life in electrical environments by eliminating electrical corrosion.
