RKB four row taper roller bearings are installed as complete assemblies and take axial loads in addition to heavy radial loads.
For quick roll changes, they have a loose fit on the roll necks, but there is the disadvantage that the inner rings wander on their seatings causing wear. To reduce these negative effects they have a helical groov.
RKB produces these bearings in two base designs, TQO and TQI configuration.
The TQO type is composed in its standard configuration of two double cone assemblies, one central double cup, two single cups and factory adjusted cup and cone spacers.
Lubrication grooves and oil holes are provided.
The TQI type is composed in its standard configuration of one double cone assembly, two single cone assemblies and two double cups.
A four separated individual single cups configuration is also available.
It is also available the version with tapered bore (designation TQIT and TQITE).
In RKB sealed TQOS type sets, they have been developed to improve the lubrication in service.
The seals are produced in several designs depending on bearing size and application needs; the most common are the integrated lateral unitized seals (european version), the integrated lateral narrow seals (compact seal concept) and the loose flange lateral unitized seals (japanese version).
RKB seals have been redesigned in new type to increase seal durability and efficiency: these seals optimize the available space.
Phosphate treatment for rings, rollers and spacers (suffix PT4) is also available.
RKB produces special executions of TQO made of four single cups and two double cone assemblies (design without spacers).
