F-51909.T3AR Axial Cylindrical Roller Bearings For Screw Extruder Gearbox

 F-51909.T3AR axial cylindrical roller bearings for screw extruder gearbox

F-51909.T3AR f-51909.t3ar BEARINGS specification as following:

Tandem roller bearing structure :
Tandem 2 rows(T2AR),

Tandem 3 rows(T4AR),

Tandem 6 rows(T6AR),

Tandem 7 rows(T7AR),

Tandem 8 rows(T8AR)*

Tandem thrust bearings are produced by only through orders

Application of tandem multi-stages roller bearings
When using tandem bearings, the following recommendations should be adhered to:
1. Preload: 1% of the dynamic basic load rating. The dynamic basic load rating of each tandem bearing see Figure 1~3. Figures not listed will be provided by out institute on request.
2. Radial guidance: full complement cylindrical roller bearings or needle roller bearings can be used.
3. Eliminate tilting: the supporting parts must be machined to eliminate any tilting.
4. Mounting tolerances: recommended the following mounting tolerances: shaft f6 and housing bore F7.
5. Lubrication: tandem bearings must always be lubricated by oil circulation

How to choose the tandem cylindrical roller bearing type:

Three pieces of information are necessary when selecting a suitable tandem bearing:
– the maximum possible bearing OD
– the desired calculated rating life under operating load and speed
– the maximum screw pressure.
The maximum possible bearing OD results from the intermeshing of two screws in the case of twin screw extruders. In the process, the crest diameter of one screw contacts the root diameter of the other screw. The resulting tight center distance and the output shaft near the
tandem bearing limit the radial design space. The length of a tandem bearing is normally not a crucial factor in bearing selection. For this limited envelope, tandem bearings are available in the 31.5 to 900 mm OD range.