Spherical bearings
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NACHI double row spherical roller bearings are available in diameters ranging from 25 mm to over 1000 mm. The raceways on the outer ring of this type of bearing are designed with a spherical surface whose center coincides with the center of the bearing. NACHI spherical roller bearings have an improved design with modified line contact between the raceways and rollers. This construction allows for very high radial and impact load capacity.
This type of bearing can withstand a moderately high level of bidirectional axial load and is self-aligning. This type is widely used for large machines where shaft deflection or mounting error may occur. Spherical roller bearings are used for paper mill equipment, rolling mills, rolling stock, shaking screens, and general industrial machinery. The assembly and disassembly of spherical roller bearings is facilitated by the use of tapered bearings in conjunction with tapered holes, adapters, or withdrawal sleeves. The internal clearance can also be precisely adjusted using a tapered bore bearing. Pressed steel cages are used for small-bore bearings, and machined, high-strength brass or mild steel cages are used for bearings with larger bores.
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