Bearings of the TQO configuration

Bearings of this design have two pairs of tapered roller and cage assemblies, the two rows of rollers of the pair being arranged face-to-face. They are the most widely used of four-row tapered roller bearings and are produced by SKF in a correspondingly wide range of sizes and designs. The main SKF focus is on the bearings without intermediate rings which have four outer rings and, of course, on the sealed bearings.
The SKF manufacturing programme comprises the bearings which are briefly described in the following and shown in the product tables. These are also available in several design variants.

TQON design

Bearing with two double row inner rings with roller and cage assemblies. Steel window-type cages and four single row outer rings (fig 1).

TQO design

Bearing with two double row inner rings with roller and cage assemblies. Steel window-type cages. One double row outer ring and two single row outer rings. Two intermediate rings between the outer rings and one between the inner rings (fig 2).

TQON.1 design

Bearing with two double row inner rings with roller and cage assemblies. Pierced rollers and pin-type cages of steel. Four single row outer rings (fig 3).

TQO.1 design

Bearing with two double row inner rings with roller and cage assemblies. Pierced rollers and pin-type cages of steel. One double row outer ring and two single row outer rings. Two intermediate rings between the outer rings and one between the inner rings (fig 4).

TQOEN design

Bearing with two double row inner rings with roller and cage assemblies; the inner rings are extended at one side. Steel window-type cages and four single row outer rings (fig 5). The extensions on the inner ring are designed as concentric lands for radial shaft seals and are ground.

TQOE design

Bearing with two double row inner rings with roller and cage assemblies; the inner rings are extended at one side. Steel window-type cages. One double row outer ring and two single row outer rings. Two intermediate rings between the outer rings and one between the inner rings (fig 6). The extensions on the inner ring are designed as concentric lands for radial shaft seals and are ground.

TQOT design

Bearing with two double row inner rings with roller and cage assemblies. The inner rings have a tapered bore, taper 1:12. Steel window-type cages. One double row outer ring and two single row outer rings. Two intermediate rings between the outer rings (fig 7). Bearings with a tapered bore are used when an interference fit is required for the inner rings on the roll neck, e.g. when rolling speeds are high.

TQOSN design

Bearing sealed at both sides with radial shaft seals. Two double row inner rings with roller and cage assemblies. Steel window-type cages and four single row outer rings (fig 8).

TQOSNP design

Bearing sealed at both sides with radial shaft seals. Two double row inner rings with roller and cage assemblies. Steel window-type cages and four single row outer rings. With spacer sleeves between the two inner rings and the two middle outer rings (fig 9).

TQOS design

Bearing sealed at both sides with radial shaft seals. Two double row inner rings with roller and cage assemblies. Steel window-type cages. One double row outer ring and two single row outer rings. Two intermediate rings between the outer rings and one between the inner rings (fig 10).

TQOSN.1 design

Bearing sealed at both sides with radial shaft seals. Two double row inner rings with roller and cage assemblies. Pierced rollers and pin-type cages of steel. Four single row outer rings (fig 11).

TQOESN design

Bearing sealed at both sides with radial shaft seals. Two double row inner rings with roller and cage assemblies; the inner rings are extended at one side. Steel window-type cages. Four single row outer rings (fig 12). The extensions on the inner ring are designed as concentric lands for additional seals and are ground.

TQOES design

Bearing sealed at both sides. Two double row inner rings with roller and cage assemblies; the inner rings are extended at one side. Steel window-type cages. One double row outer ring and two single row outer rings. Two intermediate rings between the outer rings and one between the inner rings (fig 13). The extensions on the inner ring are designed as concentric lands for additional seals and are ground.
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