NACHI E-series, 190 x 290 x 75

This range covers 11 NACHI E-Series double row spherical roller bearings with tapered bore (1:12 taper, K), W33 outer ring oil holes and groove, and C3 radial internal clearance, from 40 to 190mm bore (outer diameters 90 to 320mm, widths 23 to 108mm). Select the size from the drop-down: each size has its own bearing number, load ratings and speeds in the Model Details.

Spherical roller bearings have two rows of rollers running on a spherical outer ring raceway. They carry heavy radial loads and moderately high axial loads in both directions, have a high impact-load capacity, and tolerate shaft deflection or mounting error. They are rated on a different basis to the EXQ bearings, so compare speeds only between bearings from the same table.

Where this product is used

• Paper mill and rolling mill equipment, and other large machines where shaft deflection or mounting error can occur
• Gearboxes and industrial transmissions carrying heavy radial and combined loads
• Fans, blowers and pumps
• Conveyors, crushers and mining and mineral processing machinery
• General heavy industrial machinery

Features

• Double row spherical roller bearings: the spherical outer ring raceway lets the bearing tolerate shaft deflection and mounting error, about 2 degrees of misalignment under general service conditions
• Heat-stabilised as standard for service up to 200 °C, with minimal dimensional change
• W33 outer ring: oil holes and an oil groove to feed lubricant to the rollers, with hole, groove and hole count tabulated for every size
• C3 radial internal clearance, larger than Normal: 50 to 65 µm on the smallest bore up to 220 to 290 µm on the largest
• Tapered bore for an interference fit on a tapered shaft seat or sleeve, which allows the bearing clearance to be set at mounting

Key specifications

Available sizes

Fitting and use

A bearing running with no load can skid, so apply a load greater than 0.02 Cr.

Tapered bore bearings are always fitted with an interference fit on the shaft, on a tapered shaft seat or an adapter or withdrawal sleeve (ordered separately). Measuring the reduction in radial internal clearance is the more reliable way to set the fit than measuring axial drive-up, and the clearance left after mounting must not fall below the range minimum for the bore size.

Misalignment of about 2 degrees is permitted under general service conditions. Misaligned bearings run noisier as speed rises, so the practical limit can be lower.

W33 means the outer ring has oil holes and an oil groove. Line the housing lubricant port up with the groove so lubricant reaches the rollers.

Choosing the right option

Choose the bore first, then the outer diameter and width. The first three digits of the model are the bearing series (21300, 22200, 22300, 23000, 23100, 23200 here), and the last two digits multiplied by 5 give the bore in mm, so 22216 is an 80mm bore. Within one bore size the series changes the outer diameter and width, and with them the load rating. For example, at a 140mm bore the 23028EW33KC3 measures 210 x 53mm with a basic dynamic load rating of 585 kN, while the 22328EW33KC3 measures 300 x 102mm and 1,540 kN.

C3 clearance is larger than Normal. It suits a tight shaft fit or a temperature difference between the inner and outer ring, both of which take up clearance; the Model Details give the exact micrometre range for each size.

The bore is tapered, so the shaft seat must be tapered or the bearing mounted on a sleeve; a straight shaft will not take it directly. All sizes have a 1:12 taper.

See also: NACHI E-series spherical roller bearings with straight bore (6 sizes, 140 to 240mm bore), NACHI EXQ spherical roller bearings with tapered bore (62 sizes, 25 to 180mm bore), NACHI EXQ spherical roller bearings with straight bore (60 sizes, 25 to 160mm bore).