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Spherical Roller Bearings
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Spherical Roller Bearings |
 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
Types Of Spherical roller bearings
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 - Standard cage types for spherical roller bearings are shown in the table below. 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:
Internal Clearance - Spherical roller bearings are produced as standard with Normal radial internal clearance and most are also available with a greater C3 clearance. Radial Internal Clearance of Spherical Roller Bearings with Cylindrical Bore
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.
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