LUOYANG MONTON BEARING SCIENCE & TECHNOLOGY CO.,LTD. |
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248/2200CAF1W33 2200*2650*450mm spherical roller bearing
Construction
Spherical roller b
earings consist of an inner ring with two raceways inclined at an angle to the bearing axis, an outer ring with a common spherical raceway, spherical rollers, cages and, in certain designs, also internal guide rings or center rings. The bearings can also be sealed.
History
The spherical roller bearing was invented by engineer Arvid
Palmgren and was introduced on the market 1919 by SKF. The
design of the bearing that Arvid Palmgren invented is similar to
the design that is still in use in modern machines.
Designs
Double-row spherical roller bearing with central flange
Single-row spherical roller bearing (barrel bearing)
Most spherical roller bearings are designed with two rows of
rollers, allowing them to take very heavy radial loads and heavy
axial loads. There are also designs with one row of rollers,
suitable for lower radial loads and virtually no axial load. These
are also called "barrel roller bearings" or "Tonnenlager" and are
typically available in the 202- and 203-series.
The internal design of the bearing is not standardised by ISO, so it varies between different manufacturers and different series. Some features that may or may not exist in different bearings are:
Lubrication features in inner or outer ring
Central flange
Guide ring or center ring
Integrated seals
Cage
Dimensions
External dimensions of spherical roller bearings are standardised
by ISO in the standard ISO 15:1998.Some of the common series of
spherical roller bearings are: 213, 222, 223, 230, 231, 232, 238,
239, 240, 241, 248, 249.
Materials
Bearing rings and rolling elements can be made of a number of
different materials, but the most common is "chrome steel", (high
carbon chromium) a material with approximately 1.5% chrome content.
Such "chrome steel" has been standardized by a number of
authorities, and there are therefore a number of similar materials,
such as: AISI 52100 (USA), 100CR6 (Germany), SUJ2 (Japan) and GCR15
(China).
Some common materials for bearing cages:
Sheet steel (stamped or laser-cut)
Polyamide (injection molded)
Brass (stamped or machined)
Steel (machined)
The choice of material is mainly done by the manufacturing volume
and method. For large-volume bearings, cages are often of stamped
sheet-metal or injection molded polyamide, whereas low volume
manufacturers or low volume series often have cages of machined
brass or machined steel. For some specific applications, special
material for coating (e.g. PTFE coated cylindrical bore for
vibratory applications) is adopted.
Manufacturers
Some manufacturers of spherical roller bearings are SKF,
Schaeffler, Timken Company, NSK Ltd., NTN Corporation and JTEKT.
Since SKF introduced the spherical roller bearing in 1919, spherical roller bearings have purposefully been refined through the decades to improve carrying capacity and to reduce operational friction. This has been possible by playing with a palette of parameters such as materials, internal geometry, tolerance and lubricant. Nowadays, spherical roller bearing manufacturers are striving to refine the bearing knowledge towards more environmentally-friendly and energy-efficient solutions.
Applications
Spherical bearings are used in countless industrial applications,
where there are heavy loads, moderate speeds and possibly
misalignment. Some common application areas are:
Gearboxes
Wind turbines
Continuous casting machines
Material handling
Pumps
Mechanical fans and blowers
Mining and construction equipment
Pulp and paper processing equipment
Marine propulsion and offshore drilling
Off-road vehicles