Double Row Cylindrical Roller Bearing

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Cylindrical Roller Bearing


For cylindrical roller bearing, the cylindrical rollers are in linear contact with the raceway, with a high capability to bear radial load, which is suitable for both heavy and impact load and high-speed rotation.


Type N and NU can move axially and be adaptable to change in the relative position between shaft and housing as a result of thermal expansion or installation error, which is best as bearing at free end.


Type NJ and NF can bear certain degree unidirectional axial load. Type NH and NUP can bear certain degree bi-directional axial load.


Inner ring or outer ring is separable to facilitate assembly and disassembly. Type NNU and NN have a high rigidity to resist radial load, which are mostly used for main spindle of machine tool.


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Equivalent dynamic load

P=Fr+YFa     [KN]当Fa/Fr≤e时

P=0.67Fr+YFa [KN]当Fa/Fr>e时

Please consult ZWA Bearing for values of Y and e.



Equivalent static load

Po=Fr+YoFa   [KN]

Please consult ZWA Bearing for values of Y0


Type FC, FCD,FCDP can bear high radial load and are mainly used on rolls of rolling machines.


Such bearings are mainly for medium and large motors, generators, internal combustion engines, main spindle of machine tool, speed reducers, loading, unloading and handling machineries, various industrial machineries.


Type NU and N allow shaft to move axially within certain range in relation to housing and are therefore suitable for bearing at free end.


Type NJ and NF can bear certain degree unidirectional axial load. Type NUP and NFP can bear certain degree bi-directional axial movement and are therefore suitable for bearing at free end.


Double-row cylindrical roller bearing

Double-row cylindrical roller bearing is divided into such two types as with cylindrical hole and tapered hole.

Besides, there are also bearings with outer rings with oil holes and oil grooves.

Such bearings are mostly used on main spindle of machine tool and also in other occasions.



Four-row cylindrical roller bearing

Four-row cylindrical bearing can bear high radical load and impact load with a high working accuracy, being suitable for high speed. They are mostly used on rolls of rolling machines and also in other occasions.


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Basic type


Cylindrical roller bearings are classified by the rib types. The outer ring of a NU-type bearing has two ribs and the inner ring has no rib. The inner ring of a N-type bearing has two rib and the outer ring has no rib.


NU-type and N-type cylindrical roller bearings are used at a floating end. As separable bearings, they are easy for assembly and dismantle, with tight fit suitable for both inner and outer rings.


The outer ring of a NJ-type cylindrical roller bearing has two ribs and the inner ring has one, being able to endure the axial force in one direction.


A NUP-type cylindrical roller bearing is used at an fixed end, being able to endure the axial forces in two directions. The outer rings of such bearings have two ribs each, and the inner rings have one fixed rib and one movable rib each. One NJ-type cylindrical roller bearing and one angle ring HJ make up of a fixed-end bearing similar to NUP type. The enhanced cylindrical roller bearing can carry a high load, with 2E, 22E, 3E and 23E series as the basic designs. Their rollers are designed to carry a maximum load.


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       Single-row cylindrical roller bearing


Suffix


E    Strengthened type

M,M1 Solid cage in brass, machined and roller-guided

TVP2 Window solid cage in glass fiber reinforced polyamide and roller-guided

X*   Internal structure updated to relevant standard

* The internal structures for those bearings with a suffix EX are updated in accordance with Part 1, DIN5412 as revised on Feb.,1994.

The elements with the same sizes from the original bearing in E-type structure can not replace that of the newly designed cylindrical roller bearing.


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