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Spherical Roller Bearing
Spherical bearings have a capacity to carry high loads tolerate shocks loads, and are self aligning. As they can tolerate limited speeds, spherical bearings are used in vibrators, shakers, conveyors, speed reducers, transmissions, and other heavy machinery. Spherical ball bearings are made in varying radial thickness and axial widths to accommodate different loads.
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Sealed Spherical Roller Bearing 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 & 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, & 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 & 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. | |
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Spherical Roller Thrust Bearing Commonly found in the steel industry, the Spherical Roller Bearings have many options including tapered bore, sealing, various grease types & 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 & 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, & 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. | |
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