S V Hi-Tech Bearing (India) Private Limited

Four-row cylindrical roller bearings are used almost exclusively for the roll necks of rolling mill stands, calenders and roller presses. Because they are normally mounted with an interference fit on the roll neck, four-row cylindrical roller bearings are well suited for rolling mill applications where the rolling speed is high.

Because four-row cylindrical roller bearings can accommodate only radial loads, they are mounted together with deep groove or angular contact ball bearings, or with tapered roller bearings (either radial or thrust design) which accommodate the axial loads.

Oil impregnated bearings are self-lubricating bearings that are made using powder metallurgy technology, where metal powder is packed and heated to form a product with many pores. These pores are then impregnated with oil, which lubricates the bearing during use. The oil is sucked outwards due to the revolution of the shaft, creating an oil wedge that lifts the shaft from the bearing surface and prevents metal contact. Additionally, the heat generated from friction causes the oil to expand and seep out, providing a cooling effect.