| TFL | SKF | FAG |
|---|---|---|
|
6219/C3VL2071
|
6219/C3VL2071
|
6219-J20C-C3
|
Electrically insulated bearings with inner-ring insulation enhance equipment reliability by preventing raceway pitting, lubricant degradation, and premature failure. The coating on the inner ring is highly effective at isolating shaft voltage, while supporting smooth operation and proper load management. This configuration is especially valuable in designs where electrical current primarily affects internal rotating components.
In older DC traction motors used in mining haul trucks or locomotives—such as Hitachi DC series motors—the design often requires the bearing to electrically isolate the armature shaft from the grounded frame. In some cases, the housing fit is intentionally loose to allow for thermal expansion, making outer-ring insulation unreliable due to potential wear. The 6219/C3VL2071 (inner-ring insulated) bearing directly isolates the shaft, ensuring that stray currents from the commutator do not arc through the rolling elements.
High-speed centrifugal separators used in food processing or wastewater treatment—such as those manufactured by Alfa Laval—operate with rapidly rotating bowl assemblies. In certain worm-drive (scroll-driven) designs, the outer ring rotates with the bowl, while the inner ring is mounted on a stationary shaft. Under these conditions, centrifugal forces may cause coatings on the outer ring to delaminate. The 6219/C3VL2071 places the insulation layer on the stationary inner ring, providing a secure and stable barrier that prevents electrostatic discharge generated by high-speed fluid friction.
In cable manufacturing, high-speed tubular stranding machines—produced by companies such as Niehoff or SKET—feature large rotating tubes. The bearings supporting these tubes often have a rotating outer ring, making outer-ring coating risky due to extreme rotational forces. The 6219/C3VL2071 is installed in the fixed support base of the rotor. The inner-ring insulation prevents grounding loops that could otherwise interfere with sensitive electronic tension control systems inside the stranding machine.
*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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