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Spherical Roller Bearings

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Commonly found in the steel industry, the spherical roller bearings have many options including tapered bore, sealing, various grease types and mounting arrangements. Spherical roller bearings are able to adjust center alignment to handle inclination of the axle or shaft. It has an outer ring with a spherical raceway surface and an inner ring, which holds two rows of barrel-shaped rolling elements.

Spherical roller bearings can easily be mounted on a shaft by means of an adapter or withdrawal sleeve. The bearing is capable of supporting heavy loads, and is therefore often used in industrial machinery. When heavy axial load is applied to the bearing, the load on rollers of another row is disappeared, and can cause problems. Attention must therefore be paid to operating conditions.

Physical Characteristics

Spherical roller bearings consist of an outer ring having a continuous spherical raceway
Within which operates two rows of barrel-shaped rollers which are in turn guided by an inner ring with two raceways separated by a center rib.
This bearing has self-aligning properties, and therefore is suited for use where misalignment between the inner and outer rings occurs from housing installation error or shaft flexure.
Spherical roller bearings have a large capacity for radial loads, axial loads in either direction, and complex loads. .

In addition to bearings with cylindrical bore, those with tapered bore are also available. Bearings with tapered bore are specified by attaching the suffix "K" to the end of the bearing's basic number. The standard taper ratio is 1:12 for bearings with a "K" suffix, but for bearings in series 240 and 241 the suffix "K30" indicates the taper ratio for a bearing is 1:30. Most tapered bore bearings incorporate the use of adapters and withdrawal sleeves for shaft mounting.

Types Of Spherical roller bearings

Type	Standard type (B type)	C type	213 type	E type
Bearing series	Does not include C type	Series 222, 223, and 213 with bore dia. of 50 mm or less; series 24024 to 24038.	Series 213 with bore dia. of 55 mm or more	Series 22211 to 22218
Rollers	Asymmetrical	Symmetrical	Asymmetrical	Symmetrical
Roller guide method	Unified inner ring center rib	By guide ring between the 2 rows of rollers	By guide ring between rows of rollers on outer ring raceway	High precision cage (no guide ring, center rib)
cage type	Pressed cage; machined cage	Pressed cage	Machined cage	Molded resin cage

Other types are:

Sealed Bearings
Sealed spherical roller bearings are used when the load is heavy and the other conditions may not be favorable. The seal has two washers, one to be attached to the inner ring and one to the outer. When the inner ring rotates, the washer acts as a flinger.

Bearings For Vibrating Screens
Vibratory applications, such as vibrating screens or exciters, induce accelerations of rollers and cages in the bearings thus exerting more on the bearing. These bearings may have cylindrical or tapered bores.

Spherical roller bearings Specifications & Standards

Dimensions - The boundary dimensions of the drawn cup needle roller bearings are in accordance with ISO.

Tolerance - They are usually meant for normal tolerance but can be enhanced.

Standard cage types - In general, pressed cages are standard for small sized bearings, and machined cages are standard for large sized bearings.

E type bearings use as their standard cage type a cage molded from a newly developed glass fiber reinforced polyamide 46 resin, which has excellent heat resistance qualities (allowable operating temperatures up to 150°C), strength, as well as unsurpassed oil resistance. A standard cage may however not be able to be used for high-speed specifications, in high temperature atmospheres, or under excessive vibration/impact conditions.

Allowable misalignment - Spherical roller bearings possess the same self-aligning properties as other self-aligning bearings. The allowable misalignment angle will vary according to dimension series and load conditions, but the following misalignment angles are generally standard:

Normal load (loads equivalent to 0.09 Cr): …………0.009rad (0.5°)

Light load: …………………………………………………0.035rad (2°)

Internal Clearance - Spherical roller bearings are produced as standard with Normal radial internal clearance and most are also available with a greater C3 clearance.

Adapters and Withdrawal Sleeves af Spherical Roller Bearings
Adapters are used for installation of bearings with tapered bore on cylindrical shafts. Withdrawal sleeves are also used to install and disassemble bearings with tapered bore onto and off of cylindrical shafts. In disassembling the bearing from the shaft, the nut is pressed down against the edge of the inner ring utilizing the bolt provided on the withdrawal sleeve, and then the sleeve is drawn away from the bearing's inner diameter surface. (Precision of adapter and withdrawal sleeve are stipulated JIS B 1552 and JIS B 1556).

For bearings with a bore diameter of 200 mm or more, high pressure oil (hydraulic) type adapters and withdrawal sleeves have been standardized to make installation and disassembly easier. As shown in the diagram construction is designed to reduce friction by injecting high pressure oil between the surfaces of the adapter sleeve and bearing inner bore by means of a pressure fitting.

If the oil supply inlet is attached in the nut side of the adapter, the supplementary suffix "HF" should be added to the bearing number; if the oil supply inlet is attached on the opposite side, the suffix "HB" should be added to the bearing number. For adapter sleeves, the supplementary suffix "H" is added to the bearing's number in both cases.

The hydraulic sleeve nut is equipped with holes for bolts used for mounting and dismounting and holes for hydraulic piping. The suffix SP or SPB is added to the bearing number of the nut.

Tags:- Sealed Spherical Bearings, Sealed Spherical Roller Bearings

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