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Tapered roller bearings are designed so the tapered vertex of the raceway surfaces of the inner and outer rings and rollers converge at one point on the certerline of the bearing. Due to this design feature,rollers move along the center of theraceway surfaces. The tapered rollers are guided by the compound force of the inner and oter raceway surfaces which keep them pressed up against the large rib on the raceway surfaces which keep them pressed up against the large rib on the inner ring.A large variety of these bearings,including single,double,and four row arrangements,are in use both in metric and inch series.
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Cylindrical roller bearings
Cylindrical rollers have linear contact with the raceway,and the bearings can carry heavier load. Applications are found in situations characterized by heavy load and shock load and also high rotation speed.
The N type and NU type bearings can be movable along the shaft. They can adapt the position changes between the shaft and housing caused by the thermal expansion or the mounting erro and are most suitable for free end shafts.
NJ and NF types can accept certain axial load in one direction, and NUP type can accept certain axial load in two directions.
Inner ring and outer ring can be separable, and they are conbenient to mount and dismount.
The rigidity in carrying radial load in the NNU and NN types make them applicable for machine tool spindles.
FC, DCD and FCDP type can carry comparatively heave radial load and are mainly applied for mill rolls.
Applications of these bearings are mostly found in middle-sized and large-sized motors, electricity generators, internal comubustion engines,machine tool spindles, decelerarion devices, unloading and lifting machines and other industral machines.
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Single row cylindrical roller bearings are manufactured in three kinds of basic design: NU, N and NJ. The cylindrical rollers of NU design are axially guided between outer ring guiding ribs, whereas in the N design between inner ring guiding ribs. Both N and NU designs allow mutual displacement of rings axially in both directions and therefore can carry no axial load.
The NJ design has two guiding ribs on outer ring and one rib on inner ring, thus it can accommodate axial force to some extent in one direction. Compared with ball bearings of identical size the cylindrical roller bearings have in average a 60 per cent higher basic load rating and are therefore suitable for high radial loads and are able to operate at high rotational speeds (Unlike ball bearings, cylindrical roller bearings are generally lubricated with oil).
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Double-row tapered Roller Bearing scan replace two single-row tapered roller bearings mounted back-to-back or face-to-face when the required capacity exceeds that of single-row tapered roller bearings. If the tapered roller bearing contact lines converge away from the bearing axis, the bearing is more tolerant to misalignment.
If they converge toward the axis, the tapered roller bearing has higher resistance to moment loading, but lower tolerance for misalignment. Their main use is in gearboxes, hoisting equipment, rolling mills and machines used in the mining industry e.g. tunnelling machines.
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Single-row tapered Roller Bearings are the most widely used tapered roller bearings. They have a high radial capacity and a thrust capacity of about 60% of radial capacity.
The exact percentage depends on the contact angle of the tapered roller bearing. Variations within the type include tapered bores for frequent removal, pin cages and hollow rollers for higher capacity, and steep roller angles for higher thrust capacity.
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The REALI-SLIM® open thin section bearings product line consists of seven series. These thin section bearings range in bore diameters from 1.000 inch to 40.000 inches. Series range from .187 x .187 inch to 1.000 x 1.000 inch in cross section. Open bearings are available from stock in three configurations (Type A, C & X).
We can provide internal fit up, lubricants, separators and other features to meet the most demanding specifications. To obtain corrosion resistance, consider using KAYDON stainless steel REALI-SLIM® or ENDURA-SLIM® series of bearings. ENDURAKOTE® plating provides corrosion protection equal to or better than a full AISI 440C stainless steel bearing and can be supplied with very quick delivery.
REALI-SLIM® bearings are available with various separator options to space the rolling elements uniformly and prevent contact between them. Separator types available include: continuous ring "snap-over pocket", continuous ring circular pocket, formed wire, toroid, PTFE spacers, and spacer ball separators. See Section 4 of Catalog 300 for complete details.
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RKB four row taper roller bearings are installed as complete assemblies and take axial loads in addition to heavy radial loads.
For quick roll changes, they have a loose fit on the roll necks, but there is the disadvantage that the inner rings wander on their seatings causing wear. To reduce these negative effects they have a helical groove.
RKB produces these bearings in two base designs, TQO and TQI configuration.
The TQO type is composed in its standard configuration of two double cone assemblies, one central double cup, two single cups and factory adjusted cup and cone spacers.
Lubrication grooves and oil holes are provided.
The TQI type is composed in its standard configuration of one double cone assembly, two single cone assemblies and two double cups.
A four separated individual single cups configuration is also available.
It is also available the version with tapered bore (designation TQIT and TQITE).
In RKB sealed TQOS type sets, they have been developed to improve the lubrication in service.
The seals are produced in several designs depending on bearing size and application needs; the most common are the integrated lateral unitized seals (european version), the integrated lateral narrow seals (compact seal concept) and the loose flange lateral unitized seals (japanese version).
RKB seals have been redesigned in new type to increase seal durability and efficiency: these seals optimize the available space.
Phosphate treatment for rings, rollers and spacers (suffix PT4) is also available.
RKB produces special executions of TQO made of four single cups and two double cone assemblies (design without spacers).
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The outer ring of double row cylindrical roller bearings has no guiding ribs and therefore these bearings cannot bear any forces in axial direction. Two rows of cylindrical rollers are guided by three ribs on the inner ring.
These bearings are characterized by their high rigidity and load-carrying capacity.
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Four-row tapered Roller Bearings have characteristics similar to 2 double-row tapered roller bearings mounted side-by-side. The performance of this type of bearing is almost identical with double-row Tapered Roller Bearing, but the bearing can be subject to larger radial load than double-row Tapered Roller Bearing however its limit speed is a little lower.
Four-row tapered roller bearings are used successfully worldwide for rolling mill bearing arrangements where rolling speeds are slow to moderate. Because of their design they are able to take up those axial loads which occur in such applications in addition to radial loads and generally no separate thrust bearings are required in such arrangements.
Four-row tapered roller bearings, because of their design, must be installed as a complete bearing in the chocks. To enable quick roll changes to be made they must therefore have a loose fit on the roll necks. Loose fits have the disadvantage that the inner rings wander on their seatings under the prevailing load conditions causing wear to the seatings which normally have a lower hardness than the rings.
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Timken produces a broad range of radial and thrust needle roller bearings and bearing assemblies. Our needle bearings and assemblies are used in a variety of markets, including consumer products, construction, agriculture, automotive and general industrial goods.
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Spherical Roller Bearings
S-2000 Unit-housed double-row S-2000 spherical roller bearings have higher ratings and long L10 life. These bearings are in cast iron housings and available in pillow block, flange, and piloted flange versions.
Unisphere II High capacity double row spherical bearing in a compact, one-piece ductile iron housing. Interchangeable with ball bearing mounting dimensions.
IMPERIAL spherical roller bearings use a patented adapter mounting system for quick installation and removal. The IMPERIAL roller bearing is available in flange, pillow block, or insert configurations, with interchangeable dimensions and superior sealing options.
Imperial HD provides the added strength of steel housings. For large bore applications (8" and above), Dodge offers the Hydraulic ISAF which incorporates hydraulic nuts and pistons to assist with installation and removal.
USAF/USDAF Split cap spherical bearing using 22200, 22300, 23000, 23100 or 23200 spherical bearing insert. Available in adapter mount/tapered bore and direct mount/straight bore in 500, 600, 200 or 300 series housings.
SNF Plus / SSN Split cap spherical bearing using 22200K bearing insert. Available in adapter mount/tapered bore in 500 series housing. SNF Plus is cast iron, SSN is available in ductile iron or steel.
HFO Two piece split plummer block housing made of cast iron has oil conveying ring lubrication. Available in direct or adapter mount with 22200 or 22300 bearings.
Duplex Bearing Housings - BLO-A and PDNF Engineered product that virtually eliminates misalignment by using two bearings in a single housing.
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Timken® spherical roller bearings feature all of the characteristics that have made Timken renowned – superior design, reliable performance and comprehensive technical support. Our spherical bearings are designed to manage high radial loads and perform consistently, even when misalignment, marginal lubrication, contamination, extreme speeds and critical application stresses are present.
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RBC produces an extensive heavy duty needle roller bearing product line from 1 inch outer ring diameter to 12 ¼ inch outer ring diameter. RBC has the capability to manufacture special designs up to a 39 inch outer diameter.
The RBC SJ series of Pitchlign® heavy duty needle roller bearings are supplied in standard envelopes in both sealed and unsealed configurations. There are eight possible seal configurations. The seals can include double or single seal with the seal lip turned inward or outward. The seal can be mounted in the radius end of the ring or the chamfered end of the ring for optimum mounting variations.
RBC%u2019s patented TJ TandemRoller® heavy duty needle roller bearings increase the capacity of the standard Pitchlign® SJ series from 10% to 40% while maintaining the standard SJ envelope dimensions. The TJ design gives the heavy duty needle roller bearing 37% to 200% greater life over a standard single pocket bearing. These bearings are also available in sealed and unsealed configurations.
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needle bearings for textile applications, agricoltural applications, full complement, cageless with surface tratment
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IKO Needle Roller Bearing series includes needle roller bearings featuring a low sectional height and high precision, and various other bearings for rotating motion. A wide range of products prepared in our large variety and small lot production system and supplied through our sales network dedicated to customer service, meet the customer's needs in every industrial sector, and contribute to down sizing and resource saving of machines and equipment. Out of our many thousand kinds of products, we will introduce you to some typical examples of IKO Needle Roller Bearing series.
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Needle Roller Bearing series includes needle roller bearings featuring a low sectional height and high precision, and various other bearings for rotating motion.
A wide range of products prepared in our large variety and small lot production system and supplied through our sales network dedicated to customer service, meet the customer's needs in every industrial sector, and contribute to down sizing and resource saving of machines and equipment. Out of our many thousand kinds of products, we will introduce you to some typical examples of Needle Roller Bearing series.
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NSK supply needle roller bearings through a joint venture of over forty years between NSK Ltd. and The Torrington Company (NSK-TORRINGTON).
Needle roller bearings contain slender rollers with a length of 3 to 10 times their diameter. The ratio of the bearing outside diameter to the inscribed circle diameter is small and, as a result, they have a high radial load capacity.
NSK-TORRINGTON can supply a full range of needle roller bearings including drawn-cup radial bearings with a pressed steel outer ring or solid radial bearings with a machined outer ring. The range also includes cam followers, roller followers, needle bearings for airframes and thrust needle bearings.
To prevent the ingress of contamination, NSK-TORRINGTON needle roller bearings can also be supplied with contact seals, non-contact labyrinth seals or flingers.
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Needle roller and cage assemblies are single or double row units comprising cages and needle rollers.
Since their radial section is no greater than the diameter of the needle rollers, needle roller and cage assemblies allow bearing arrangements with a very small radial design envelope to be achieved. They have very high load carrying capacity, are suitable for high speeds and can be easily fitted.
If the raceways are produced to high geometrical accuracy, bearing arrangements with high runout accuracy can be achieved.
The radial internal clearance can be influenced by the needle roller sort and by the shaft and housing tolerance.
Needle roller and cage assemblies require a hardened and ground raceway on the shaft and in the housing.
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Timken produces a broad range of radial and thrust needle roller bearings and bearing assemblies. Our needle bearings and assemblies are used in a variety of markets, including consumer products, construction, agriculture, automotive and general industrial goods.
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planetary bearings for gearboxes
SL and RSL types, transmission bearings, hydraulic motor and pump bearing
bearings with black oxide rollers for heavy conditions
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There are two kinds of spherical roller bearing, one has a cylindrical bore, the others has a tapered bore (K). Spherical bearings offer an unequalled combination of high load capacity, high tolerance to shock loads, and self-aligning ability but they are limited by speed. Spherical rollers are put between the spherical raceway on the outer ring and the two grooves on the inner ring of the bearing.
The symmetrical barrel rollers freely align themselves to the concave outer ring raceway. As a result, shaft deflections and misalignments of the bearing seats are compensated. Double row spherical roller bearings can accommodate high radial and simultaneously also axial loads in both directions. These bearings are massively widespread, particularly in applications where high load accommodation is required and their self-alignment advantage can be best utilized.
It is particularly suitable for metallurgy, mining, petroleum, cement....etc (Vibrators, shakers, conveyors, speed reducers, transmissions, and other heavy machinery)
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NSK manufactures a complete range of spherical roller bearings from 25mm to 1.5m bore diameter with the option of parallel or tapered bores (for use with NSK adapter or withdrawal sleeves). Other sizes may also be available on request.
Spherical roller bearings can support high radial loads and moderate axial loads in either direction. They are also suitable for applications involving moderate shock or impact loads.
The inner ring guides two rows of barrel-shaped rollers, with a single spherical outer ring raceway. As such, these bearing can accommodate a varying degree of misalignment depending on their size, but normally between 0.018 and 0.045 radian (1 to 2.5 degrees) with average loads.
Different cage materials are available for these bearings including steel, brass or polyamide depending on the requirements of the application. These bearings are also available with an oil groove and holes in the outer ring for re-lubrication purposes.
In addition, NSK can provide a range of specially designed spherical roller bearings for vibrating machinery applications.
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Timken® spherical roller bearings feature all of the characteristics that have made Timken renowned – superior design, reliable performance and comprehensive technical support. Our spherical bearings are designed to manage high radial loads and perform consistently, even when misalignment, marginal lubrication, contamination, extreme speeds and critical application stresses are present.
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We are approved to manufacture bearings to military and aerospace specifications. The bearings we produce meet the standards of AS-3990. Our engine bearings are currently used in thrust reversers, after burners and divergent nozzles. Our airframe bearings are used in flap-tracks, canopies and landing gear.
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Barrel roller bearings are single row, self-aligning roller bearings. They comprise solid outer rings with a concave raceway, solid inner rings with two ribs and a cylindrical or tapered bore and barrel rollers with cages. The bearings cannot be dismantled.
Barrel roller bearings are particularly suitable where high radial shock type loads occur and misalignments must be compensated, see Compensation of angular misalignments. Their axial load carrying capacity is small.
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Nadella can look back on its experience of many years in the production of precision antifriction bearings. In addition Nadella has the suitable production possibilities for smaller, middle and large series and thus the ability to compile and realize related to customers problem solutions.
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IKO Needle Roller Bearing series includes needle roller bearings featuring a low sectional height and high precision, and various other bearings for rotating motion. A wide range of products prepared in our large variety and small lot production system and supplied through our sales network dedicated to customer service, meet the customer's needs in every industrial sector, and contribute to down sizing and resource saving of machines and equipment. Out of our many thousand kinds of products, we will introduce you to some typical examples of IKO Needle Roller Bearing series.
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