Spherical roller bearings, as shown in the figure, come in EA, C, CD, and CA types with high load capacity design. In terms of design, EA type, C type, and CD type are stamped retaining frames, CA type is a copper alloy car made retaining frame. EA type bearings have the advantages of high load capacity and low torque.
The standard design of EA type is equipped with oil holes and oil grooves. For other types, oil grooves and oil holes can also be set up to supply lubricant. For bearings with an outer diameter less than 180mm, if oil grooves and oil holes are required, please mark E4 on the bearing model when ordering from NSK. For bearings with an outer diameter greater than 180mm, the standard design is equipped with oil grooves and oil holes (bearing models with E4).
In addition, when using bearings with oil grooves and oil holes, the depth of the bearing oil groove is limited. So it would be more effective to also install an oil groove on the inner diameter of the casing.