Electrical Protection: Breakdown voltage up to 3000V. Blocks stray currents to prevent electrical corrosion.
Reliable Quality: Compliant with ISO 9001 and REACH standards. The production process is fully traceable.
Plasma Spray Technology: Creates a coating with excellent wear and heat resistance.
Flexible MOQ: Low Minimum Order Quantity (MOQ). Supports both small-batch and large-volume orders.
TFL 6230/C3VL2071 is a 100% equivalent and direct replacement for large-size insulated bearings from SKF and FAG in terms of mechanical dimensions (150x270x45mm), standard pressed steel cage structure, C3 clearance, and VL2071 inner-ring standards. All bearings undergo strict voltage resistance and insulation resistance testing before dispatch. Customers can achieve direct replacement without changing the original motor shaft or end-shields.
| SKF | FAG |
|---|---|
| 6230/C3VL2071 | 6230-J20C-C3 |
Supplying technically challenging inner-ring insulated bearings with a 150mm bore (controlling bore-coating adhesion and tolerances is far more complex than on the outer ring) is a test of premium supply chains and quality management. Relying on a robust premium power transmission supply chain network and a strict quality control system, TFL provides high-quality products that deeply integrate advanced coating processes with precision mechanical standards. We not only provide high-reliability anti-erosion solutions rivaling top global brands but also offer professional technical support from our engineering team for selection and diagnostics. With rapid-response stock availability and No MOQ, TFL is dedicated to helping global clients eliminate lead-time risks on large specialized parts, achieving significant cost optimization.
Inner-Ring Insulation (VL2071) — High-bond alumina coating on the bore and side faces to isolate high-voltage stray currents directly at the source.
C3 Radial Internal Clearance — Crucial for compensating heat-induced shaft expansion in MW-class motors.
High Dielectric Strength — Guaranteed DC breakdown voltage up to 3000 V with resistance > 50 MΩ.
TFL 6230/C3VL2071 inner-ring insulated bearings are developed for VFD equipment where “the outer ring is strictly prohibited from being insulated,” while facing significant temperature rises and VFD leakage currents. Typical applications encompass rail transit and large AC traction motors requiring absolute stator grounding, metallurgical exhaust fans with tight cooling jackets, and high-precision split-housing centrifugal compressors. Its standard steel cage ensures smooth medium-to-high speed runs, providing a long-lasting electrical isolation barrier without altering housing dimensions.
In AC traction systems for heavy-haul locomotives by Alstom or CRRC, to meet strict grounding and shielding designs, the bearing’s outer ring must maintain direct bare-metal contact with the housing for grounding, making standard outer-ring coatings prohibited. The TFL 6230/C3VL2071 inner-ring insulated bearing utilizes its VL2071 bore coating to intercept high-frequency leakage currents directly at the rotor source. Its pressed steel cage delivers exceptionally low rotational friction, making it ideal for continuous smooth running at medium-to-high speeds. The C3 clearance reserves ample anti-seizure buffer for high thermal expansion, acting as a highly recommended anti-erosion solution for locomotive overhauls.
In large heavy-duty centrifugal exhaust fans used in steel mills (e.g., Howden systems), extreme exhaust heat conducts along the rotor shaft. For forced cooling, housings are equipped with tight water-cooling jackets requiring an extreme interference fit with the bearing's outer ring for heat transfer. Under such assembly, a fragile outer-ring coating would be scraped off or act as a thermal barrier. TFL 6230/C3VL2071 perfectly bypasses outer-ring mechanical limits using its inner-ring VL2071 coating. Concurrently, its C3 clearance resolves the extreme differential thermal expansion caused by internal heat (shaft) and external cooling (jacket), thoroughly curing inverter-induced electrical erosion damage without interfering with the original heat-dissipation structure.
For large multi-stage centrifugal compressors by Atlas Copco or MAN Energy Solutions used in chemical air separation units, the housing often adopts a “top-bottom split” design to facilitate the lifting of large-shaft rotors. This structure demands absolute outer-ring conformance to the bore to ensure micron-level concentricity. TFL 6230/C3VL2071 resolves this mechanical assembly contradiction with its inner-ring insulation. Without altering the original precision housing assembly processes, it isolates high-frequency VFD currents right at the rotor shaft, while its standard pressed steel cage ensures minimal running resistance and energy consumption under high-speed operations.
*The brands and series mentioned are provided for industry illustration only. Final bearing selection should be confirmed through verification of dimensions, clearance class, insulation type, and operating conditions. For selection assistance or technical consultation, please contact the TFL engineering team for support.
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