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Bearing Types
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Cylindrical Roller Bearings
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Cylindrical Roller Bearings |
If there is no ribs, either the inner or the outer ring can move freely in the axial direction. Cylindrical roller bearings are therefore ideal to be used as so-called "free side bearings" that absorb shaft expansion. Physical Characteristics Although the rolling elements in cylindrical roller bearings are called "cylindrical," they are not true cylinders. True cylinders would produce stress concentrations at the ends of the roller-race contact, resulting in high wear and high sensitivity to misalignment. Instead, rollers are usually crowned or end relieved. You will find various types and characteristics of cylindrical roller bearings in the following tables: Click here - Single row cylindrical roller bearing types and characteristics Click here - Non-standard type cylindrical roller bearing characteristics Application Of Cylindrical Roller Bearings Cylindrical roller bearings are used in power generation, oilfield, mining and aggregate processing, gear drives, rolling mills, machine tools, transmissions, vibration machines and as wheelset bearings for rail vehicles. Types Of Cylindrical Roller Bearings There are three basic types of cylindrical roller bearings:
The rollers of single row cylindrical roller bearings with cage are guided on one of the bearing rings. The bearing ring with integral flanges and the roller and cage assembly can be withdrawn from the other ring. This allows easy mounting and dismounting. They have high radial load carrying capacity at high speeds. EC type bearings have larger load carrying capacity. Depending on the type and location of the flanges, they are of different types:
They incorporate maximum number of rollers and low sectional height as compared to width allowing very high load carrying capacity. They are suitable for very high radial loads. The rollers are in direct contact with each other and slide against each other while rolling. The single row bearings are developed as standard single row designs they have two integral flanges on the inner ring and one on the outer. This helps locate the shaft in one direction. They are suitable for heavily loaded slow speed applications. The double row bearings have an annular groove for lubrication. All different types of double row cylindrical roller bearings differ in the number of flanges in the outer ring.  Crossed Cylindrical Roller Bearings The raceways in the inner and the outer rings of the crossed cylindrical roller bearings are inclined at an angle of 45 °. The diameter of the rollers is larger than the length. They provide stiff bearing arrangements and can carry very heavy loads. They require minimum of space and require very less space. They can accommodate radial, axial and moment loads. Their surface finish maximizes lubricant film formation and optimizes rolling motion of the rollers. Apart from the standard single row they are available in other:
Standard cage types The following table shows the standard cage types for cylindrical roller bearings:  Dimensions - The dimensions are as per the ISO recommendations Allowable misalignment - They are designed to adjust to limited angular misalignments of the inner ring with respect to the outer to a few minutes of the arc. The elastic deformation in the crossed cylindrical type is minimal because of large number of rollers and line of contact between them. Although values vary somewhat depending on bearing type and internal specifications, under general load conditions, to avoid the occurrence of edge loading, allowable misalignments have been set as follows:
Tolerance - They are usually meant for normal Internal Clearance - For radial internal clearance of single and double row, normal is taken as standard and the axial clearance varies.
Normal radial internal clearance is taken as standard in full compliment cylindrical roller ball bearings. Normal radial internal clearance is taken as standard in crossed cylindrical roller ball bearings.
Minimum Load - For satisfactory operation, the bearings must be subjected to the minimum load that is calculated by: 
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