Four-row tapered roller bearings feature four sets of tapered raceways and tapered rollers, and therefore have very high load carrying capacities and very high stiffness. Furthermore, four-row tapered roller bearings combine the inherent high-load radial/thrust capacity and direct/indirect mounting variables of tapered roller bearings into assemblies offering maximum load rating in minimum space.

Because of different direction of the raceway and roller rows, the four row tapered roller bearings are available in the TQI and TQO designs. For the TQI design, the bearings have the two sets of rows of tapered rollers and raceways arranged back-to-back. They have three outer rings or cups and two double row inner rings or cones. Generally, a cup spacer is placed between the outer rings and a cone spacer is place between the inner rings to provide certain axial clearance or preload.

While for the TQO design, bearings have the two sets of rows of tapered rollers and raceways arranged face-to-face. They have two double row outer rings or cups and three inner rings or cones. Generally, a cup spacer is placed between the outer rings and a cone spacer is place between the inner rings to provide certain axial clearance or preload.

Application

The four-row tapered roller bearings are usually used in roll necks of high-speed rolling mills, agriculture, construction and mining equipment, sports robot combat, axle systems, gear box, engine motors and reducers, propeller shaft, railroad axle-box, differential, wind turbines, etc.