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Four-row tapered roller bearings

Cones and cups of four-row cylindrical roller bearings are manufactured in two types of steel according to the application:

1 - Core hardened UNI 100Cr6 steel.

2 - Case hardened UNI 18NiCrMo5 steel.

In both cases, hardness reaches the degree of 60-2 HRC.

The distance rings are manufactured in the same type of steel, whereas the cages are manufactured in press-forged steel.

All the bearings are provided with holes and lubrication grooves on the outer part.

Four-row tapered roller bearings should be fixed as complete units in the correct housings, in order to allow a correct functioning and a quick replacement of the cylinders in case of maintenance.

Four-row tapered roller bearings are manufactured like the similar series with cylindrical rollers, with different executions, according to the specific needs of the working condition of the steel mill plant. They are manufactured both in metric and inch execution. C.R. four-row tapered roller bearings are manufactured with normal tolerance class, the precision of rotation belongs to class P5. The bearings are supplied in complete units ready to be assembled.

The internal clearances are settled according to the application and in any case they are always marked with suffixes and numbers written on the drawings.

C.R. tapered roller bearings of this series undergo stabilization treatment, which allows them to be used up to 300° C without any dimensional modification.

Technical Characteristics

C.R. four-row tapered roller bearings are used on the neck of the cylinders, on steel mills in which the speed of milling is moderate. Their construction shape allows them to bear high axial loads, along with radial loads. Therefore they do not need lateral thrust bearings. The bearings of this series are manufactured with cylindrical hole and with tapered hole.

1. Cone

2. Distance ring

3. Cage

4. Tapered rollers

5. Double cup

6. Tapered rollers

7. Cage

8. Distance ring

9. Double cone

10. Cage

11. Tapered rollers

12. Double cup

13. Tapered rollers

14. Cage

15. Distance ring

16. Cone

Esecution ETO

The bearings of this execution have two couples of rows with “X” shape. They have two double cones, one double cup and two single cups or four single cups.

Esecution ETOE

Like ETO execution, but with larger inner rings. Their extensions are grinded and act as ball raceways for the seals.

Esecution ETOT

Like ETO execution, but with the tapered hole, taper 1:12.

Esecution ETI

The bearings of this execution have two couples of “O” rows. They are made of one double cone and of two single cones or two double cups or four single cups.

These bearings usually have press-forged steel cages. ETI bearings are generally used when a high stiffness is needed and high tilting moments must be born.

They are also used on the vertical cylinders of all-purpose steel mills.

Esecution ETIT

Like ETI execution, but with taper hole, taper 1:12 or 1:30.

C.R. s.r.l. - 26845 Codogno (LODI) - ITALY - Via S. Pertini, 6/8 (Z.I.) - tel. +39 0377 437021 - fax +39 0377 437107 - p.iva 01183740198 |  info@crsrl.com