Double-Row Tapered Roller Bearings
Double-row tapered roller bearings have high load carrying capacity and rigidity. They are suitable for combined loads (radial and axial load) and can locate shaft in double directions. The clearance of double-row tapered roller bearings have to be adjusted before delivery, so they can be used without adjusting again.
The structure of double-row tapered roller bearings mainly have back-to back arrangement( using double row outer rings) and face-to face arrangement(using double row inner rings)
The bearing with TDI configuration consists of an inner ring with double rollers and cage assemblies and two outer rings (cups). The two outer rings are arranged face to face with the narrow side and usually separated with a spacer to obtain a proper axial clearance.
The bearings with TDO configuration consist of an outer ring with double raceways and two inner rings with rollers and cage assemblies. The two inner ring are arranged back to back and usually separated with a spacer. As the adjustment of clearance and preload have already been made at the production stage, so they are easy for customers to mount without adjustment again. Due to the back to back arrangement, the load lines diverge towards the bearing axis. By virtue of this the bearings enable relatively stiff arrangements to be made which can accommodate considerable tilting moments.
The bearings can be used as locating or non-locating applications. For non-locating arrangement, the axial displacement is only allowed between the outer ring and housing bore. Bearings with TDO configuration have multiple designs, Basically these designs differ in cage design or whether provision is made for relubrication or an intermediate ring is positioned between the inner rings.