High Precision Insulated Bearing 6218/C3VL0241 is Deep Groove Ball Bearing design. its dimension is 90×160×30mm, it has the same dimension and the same design with normal chrome steel 6218/C3 bearing. but the most different is 6218-C3J20AA bearing with Aluminium Oxide Coating. this insulated can be inner ring coating or outer ring coated. the coating can Electrical Resistance Voltages up to 3000 V DC. This kind of bearing are widely used in high quality demand application like traction motor.
Electrically Insulated Bearing are not only Electrically Insulated deep groove ball Bearing, but also Electrically Insulated Cylindrical Roller Bearing, Electrically Insulated Tapered Roller Bearing, Electrically Thrust Roller Bearing and the other type Normal or Non-Standard Electrically Insulated Rolling Bearings. they are the same dimension, same cage, same elements and the other data with normal chrome steel rolling bearing, just the different coating on the surface of the inner ring or outer ring of the Rolling Bearing.
Current-Insulated Bearings Prevent Damage Caused by Electrical Current
Damage Caused by Electrical Current and Its Consequences
Rolling bearings used in:
• wheelsets and traction motors (rail vehicles)
• DC and AC motors (drivetrains)
• generators (wind power)
| Designation | Principal dimensions | Basic load ratings | Fatique load limit | Speed ratings | Weight |
| Deep groove ball bearing | mm | mm | mm | dynamic | static |
| Reference speed | Limiting speed | kg |
| d | D | B | C[kN] | C0[kN] |
| [r/min] | [r/min] |
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| 6314/C3VL0241 | 70 | 150 | 35 | 111 | 68 | 2.75 | 9500 | 6300 | 2.5 |
| 6314 M/C3VL0241 | 70 | 150 | 35 | 111 | 68 | 2.75 | 9500 | 9000 | 3 |
| 6215/C3VL0241 | 75 | 130 | 25 | 68.9 | 49 | 2.04 | 10000 | 6700 | 1.2 |
| 6315/C3VL0241 | 75 | 160 | 37 | 119 | 76.5 | 3 | 9000 | 5600 | 3.1 |
| 6315 M/C3VL0241 | 75 | 160 | 37 | 119 | 76.5 | 3 | 9000 | 8000 | 3.7 |
| 6216/C3VL0241 | 80 | 140 | 26 | 72.8 | 55 | 2.2 | 9500 | 6000 | 1.4 |
| 6316/C3VL0241 | 80 | 170 | 39 | 130 | 86.5 | 3.25 | 8500 | 5300 | 3.6 |
| 6316 M/C3VL0241 | 80 | 170 | 39 | 130 | 86.5 | 3.25 | 8500 | 7500 | 4.2 |
| 6217/C3VL0241 | 85 | 150 | 28 | 87.1 | 64 | 2.5 | 9000 | 5600 | 1.8 |
| 6317/C3VL0241 | 85 | 180 | 41 | 140 | 96.5 | 3.55 | 8000 | 5000 | 4.1 |
| 6317 M/C3VL0241 | 85 | 180 | 41 | 140 | 96.5 | 3.55 | 8000 | 7500 | 4.8 |
| 6218/C3VL0241 | 90 | 160 | 30 | 101 | 73.5 | 2.8 | 8500 | 5300 | 2.4 |
| 6318/C3VL0241 | 90 | 190 | 43 | 151 | 108 | 3.8 | 7500 | 4800 | 5 |
| 6318 M/C3VL0241 | 90 | 190 | 43 | 151 | 108 | 3.8 | 7500 | 7000 | 5.8 |
| 6219/C3VL0241 | 95 | 170 | 32 | 114 | 81.5 | 3 | 8000 | 5000 | 2.5 |
| 6219 M/C3VL0241 | 95 | 170 | 32 | 114 | 81.5 | 3 | 8000 | 7500 | 3 |
| 6319/C3VL0241 | 95 | 200 | 45 | 159 | 118 | 4.15 | 7000 | 4500 | 5.7 |
| 6319 M/C3VL0241 | 95 | 200 | 45 | 159 | 118 | 4.15 | 7000 | 6300 | 6.5 |
| 6220/C3VL0241 | 100 | 180 | 34 | 127 | 93 | 3.35 | 7500 | 4800 | 3.2 |
| 6320/C3VL0241 | 100 | 215 | 47 | 182 | 140 | 4.75 | 6700 | 4300 | 7 |
| 6320 M/C3VL0241 | 100 | 215 | 47 | 182 | 140 | 4.75 | 6700 | 6000 | 8.1 |
| 6222/C3VL0241 | 110 | 200 | 38 | 151 | 118 | 4 | 6700 | 4300 | 4.5 |
| 6222 M/C3VL0241 | 110 | 200 | 38 | 151 | 118 | 4 | 6700 | 6300 | 5.1 |
Features and Benefits of Coated Bearings 6218/C3VL0241
Current-Insulated Bearings as a Preventive Measure
As a rule, it is very difficult to eliminate the causes of bearing voltages that are induced by the motor. Nevertheless, it is possible to avoid damage to the bearing, if the flow of current can either be prevented or at least significantly reduced. Many types of current-insulated rolling bearings are available today for this very purpose. Which components need to be insulated depends on the type of voltage involved:
Induced Voltage along the Shaft
This produces a circular current, which is closed via bearing 1, the housing, and bearing 2. Such shaft voltages are often the result of an asymmetrical distribution of the magnetic flux within the motor. This is especially evident in motors with only a few pairs of poles. If this is the case, it is sufficient to disrupt the flow of current by insulating one of the two bearings.Voltage between the Shaft and the Housing
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