BEARINGS PRODUCTION RANGE

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 cup configuration is also available. This design facilitates the
reworking of the bearing.
These bearings are fitted with pressed steel cage or with pierced rollers and steel pin-type cage. The
fact that contact angles diverge makes the bearings well suited to resist to warping and misalignment.
The version with tapered bore that, with its three-cone design, assures easy assembly and disassembly
(designation TQIT and TQITE) is also available.
In RKB sealed TQOS type sets, four-row taper roller bearings have been developed to improve the
lubrication in service. The incorporation of this type of bearing simplifies design, reduces grease
consumption and routine maintenance requirements and attains longer service life.
The seals, fitted on both sides of the bearing set, are produced in several designs depending on bearing
size and application needs; the most common ones 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).
So the basic design with the garter seal, made by reinforced fluoro rubber and steel spring, is located
in the integral external cups.
Alternatively, the separate seal carrier flanges are matched to the cups and a chock type seal runs on
extended surface of inner rings.
Furthermore, RKB seals have been redesigned in new type to increase seal durability and efficiency:
while maintaining an overall narrow profile, these seals optimize the available space by utilizing the
area directly adjacent to or underneath the cage bore, with the result of the usage of longer rollers with
consequent increased bearing capacity similar to open type version.
RKB sealed four-row taper roller bearings are usually provided also with O-rings in the outboard cup
outside diameter to seal contaminants from the bearing outer diameter and/or with a cone seal set
designed to accommodate relative motion between inner rings and to prevent build-up of negative
pressure (anti-vortex system technology for longer bearing life and less lubricant deterioration).
Phosphate treatment for rings, rollers and spacers (suffix PT4) for anti-rust and anti-corrosion properties
under water, alkalescent and acidescent working conditions is also available.
RKB produces special executions of TQO made of four single cups and two double cone assemblies
(design without spacers).
Most of TQO and TQI four-row taper roller bearings are manufactured with inch dimensions as per
American AFBMA 19/1974 and as per RKB standard practice, dimensional and running accuracy grade
is in accordance with class 2 or 4.
Highlights
Part number:
Bore:
Outside diameter:
Width:
Mass:
Dynamic load carrying capacity:
Static load carrying capacity:
Application:
TQO 331925 A2AHA1ZBBT4B
609,600 mm
813,562 mm
479,425 mm
695 kg
10500 kN
30000 kN
Rolling Mill/Steel Industry
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