Some cylindrical roller bearings do not have ribs on either the inner or outer rings, so the rings can move axially relative to each other. These can be used as free end bearings. Roller bearings with two ribs on the inner or outer ring and one rib on the other ring can withstand a certain axial load in one direction. Full complemented roller bearings without outer ring have high radial stiffness and are mainly used in precision machine tools. All types of outer and inner rings are separable. Usually pressed steel or machined brass cages are used, but sometimes moulded polyamide cages are also used. Roller bearings are available in various designs, series, variants and sizes. The main design differences are the number of rows of rollers and inner/outer ring flanges and cage design and materials. Bearings can handle application challenges with high radial loads and high rotational speeds. Accommodating axial displacement, they have high stiffness, low friction and long service life. Roller bearings are also available in sealed or split designs. In sealed bearings, the rollers are protected from contaminants, water and dust, while retaining lubricant and removing contaminants. This reduces friction and increases service life. Split bearings are primarily used in hard-to-access bearing installations, such as crankshafts, to simplify maintenance and replacement. In a full complement of roller bearings without an outer ring, the shaft is allowed to move in both directions to the bearing housing, that is, cylindrical roller bearings can withstand changes in shaft length caused by thermal expansion. Therefore, it is suitable for use as a non-fixed bearing. It can withstand large radial loads, but cannot withstand axial loads. Full complement roller bearings without outer ring are mechanical elements that support shafts and shafts. Depending on their design, they absorb radial and/or axial loads and at the same time rotate the shaft or shaft-mounted components. The force is transmitted by spherical or rolling-shaped rolling elements. Advantages include the following: Low friction, even from standstill with low cooling and lubrication requirements, grease lubrication is usually sufficient Radial, axial and combined load capacities are easily achieved Operation with virtually no clearance or preload Rolling bearings are already used worldwide Available as an installable standard parts series.
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