Cylindrical roller bearing with four or more rows of rollers are used almost exclusively for rolling mills. They have lower friction than other roller bearings and can be successfully used where hight speed operation is called for. The low cross-sectional height of cylindrical roller bearings means that the roll necks can have large diameter in relation to the roll itself. In four rows cylindrical roller bearings, the rollers are guided between integral or not-integral flanges on the outer ring. The inner ring is without flanges; axial displacement of the shaft with respect to the housing can therefore be accomodated by the bearing within certain limits. Depending on the application, four rows cylindrical roller bearings can be supplied with a cylindrical bore or tapered bore. The inner or outer ring may be in one piece ore in more than one piece.
The dimension of the bearings with the series designations listed in the tables comply to ISO 15-1981.
Multi-row cylindrical roller bearings are not designed to accomodate any misalignment.
Excluding particular request of costumers, four row cylindrical roller bearings with cylindrical or tapered bore have a dimensional accuracy corresponding to P6 tolerance class and a running accuracy to P5 tolerance class.
RADIAL INTERNAL CLEARANCE
Four row cylindrical roller bearing with cylindrical and tapered bore are produced with C3 or C4 radial internal clearance. On costumer’s request are available bearings with different radial internal clearances. All cylindrical roller bearings that presented helical groove on the inner ring bore, are made with C2 radial internal clearance.
In relation to the execution, four row cylindrical roller bearing are fitted with either two double pronge machined roller guided cages of brass or steel, pin-types cages of steel (with pierced roller) or machined cages of brass with vent-hole. Some execution are supplied with steel pressed sheet.
With some special exception, multi-row cylindrical roller bearing undergo special stabilizing treatment S0 which make them suitable for operating temperatures up to +150°C. On customer’s request it’s possible have other stabilizing treatment as:
> S1 (for working up to +200°C)
>S2 (for working up to +250°C)
A/B/C/D/E – Deviating or modified internal design
C2 – Radial internal clearance less than Normal
C3 – Radial internal clearance greather than Normal
C4 – Radial internal clearance greather than C3
C5 – Radial internal clearance greather than C4
HA1 – Case-hardening of outer and inner rings
HA2 – Case-hardening of outer ring
HA3 – Case-hardening of inner ring
HA4 – Case-hardening of rollers, outer and inner rings
HB1 – Bainitic hardening for outer and inner rings
HB2 – Bainitic hardening for outer ring
HB3 – Bainitic hardening for inner ring
G – Helicoidal groove on the bore
K/K30 – Tapered bore, 1:12 on diameter (K); 1:30 on diameter (K30)
M – Machined brass cage
P4/P5/P6 – Dimensional and running accuracy to ISO tolerance class 4/5/6
VJ202 – Two rows bearing group
W – Lubrication groove on rings surface
WI – Lubrication groove on inner rings surface
WO – Lubrication groove on outer rings surfaces
W33 – Lubrication groove and three holes in outer ring
S0 – Stabilized rings up to 150°C
S1 – Stabilized rings up to 200°C
S2 – Stabilized rings up to 250°C
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