Electrically Insulated Bearing 6336 M/C3VL2071 is Deep Groove Ball Bearing design. its dimension is 180×380×75mm, it has the same dimension and the same design with normal chrome steel 6336 M bearing. but the most different is 6336-M-J20AA bearing with Aluminium Oxide Coating. 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.
Bearings in electric motors and generators must support the rotor radially and locate it axially in relation to the stator. The typical bearing system consists of a locating and a non locating bearing. In most medium and large motors and generators, the locating bearing is a deep groove ball bearing, while the non-locating bearing can be a deep groove ball bearing, an N or NU design cylindrical roller bearing or a CARB toroidal roller bearing. Smaller motors, fitted with two deep groove ball bearings mounted on a short shaft, often have a cross-locating bearing system.
| 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] |
| 6328 M/C3VL2071 | 140 | 300 | 62 | 265 | 245 | 7.1 | 4800 | 4300 | 21.8 |
| 6230/C3VL2071 | 150 | 270 | 45 | 186 | 166 | 4.9 | 5000 | 3200 | 10 |
| 6330/C3VL2071 | 150 | 320 | 65 | 286 | 285 | 7.8 | 4300 | 2800 | 23 |
| 6332 M/C3VL2071 | 160 | 340 | 68 | 291 | 285 | 7.65 | 4000 | 3800 | 31 |
| 6334 M/C3VL2071 | 170 | 360 | 72 | 332 | 340 | 8.8 | 3800 | 3400 | 35 |
| 6336 M/C3VL2071 | 180 | 380 | 75 | 371 | 405 | 10.4 | 3600 | 3200 | 41 |
Most motors are designed with a locating/ non-locating bearing system. The locating bearing positions the shaft axially. The non locating bearing is designed to accommodate thermal elongation of the shaft to avoid induced axial loads. For the locating bearing position, radial bearings that can accommodate combined (radial and axial) loads are used. These include deep groove ball bearings, matched single row angular contact ball bearings, double row angular contact ball bearings and spherical roller bearings. There are two ways to accommodate thermal displacements of the shaft at the nonlocating bearing position.
The first is to use a bearing that only accommodates radial loads and enables axial displacement within the bearing. These include CARB toroidal roller bearings and those cylindrical roller bearings that have one ring without flanges. The other method is to use a radial bearing mounted with a loose fit in the housing so that the outer ring is free to move axially
Different application requirements need to be considered when designing an electric motor’s bearing system such as service life, noise levels and maintenance. Sometimes, the requirements are such that a compromise may be necessary. For example, if an application has high operating temperatures, it may not be possible to use greased-for-life bearings that have seals or shields. Instead, relubrication features may be necessary.
Features of Electrically insulated bearings
1. High insulation properties
To prevent electric corrosion in bearings, a highly productive aluminum ceramic coating material is used to coat the outer ring, and by combining optimized additives, insulation performance is improved by about tenfold.
2. Improved durability
· Optimizing bearing elements improves film impact resistance by a factor of 3x.
· Optimized ceramic coating materials makes for excellent heat dissipation.
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