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RTB - Combined axial-radial roller bearing for indexing tables
Axial-radial precision bearings for indexing tables.
Due to their high axial stiffness and their capacity to bear high tilting moments, UNITEC bearings RTB series are particularly recommended for rotating, positioning and indexing tables and milling heads.
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Cylindrical roller bearings
Feature
Cylindrical rollers have linear contact with the raceway, and the bearings can carry heavier radial 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 to the position changes between the shaft and housing caused by the thermal expansion or the mounting error and are most suitable for free end shafts. NJ and NF types can accept certain axial load in one direction, and NH and NUP types can accept certain axial load in two directions. Inner ring and outer ring can be separable, and be they are convenient to mount and dismount. FC, FCD and FCDP types can carry comparatively heavy radial load and are mainly applied for mill rolls.
Applications
These bearings are mostly found in middle-sized and large-sized motors, electricity generators, internal combustion engines, gas turbines, machine tool spindles, deceleration devices, unloading and lifting machines and other industrial machines.
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Cylindrical Roller Bearings
Large radial load capacity.
Suitable for high-speed applications.
Low friction between rollers and flanges.
Configuration N , NU
No redial load capacity due to no flange of outer or inner ring.
Used a non-locating side.
Configuration NF , Configuration NJ , Configuration NUH
Small radial load capacity in only one direction with on integral flange or by mountings a loose flange.
Configuration EG
Higher Load Capacities Provide Longer Life
Using larger rollers than those in conventional bearings drastically increases the load carrying capacity of this bearing design. This increase in load capacity provides for longer bearing life.
Low Temperature Rise and Quiet Operation
A polyamide retainer is highly effective in minimizing temperature increases and ensuring quiet operation at high operating speeds.
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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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Since the rolling elements in cylindrical roller bearings make line contact with raceways,these bearings can accommodate heavy radial loads . The rollers are guided by ribs on either the inner or outer ring ,therefore these bearings aer also suitablefor high speed applications.Furthermore, cylindrical roller bearings are separable ,and relatively easy to install and disassemble even when interference fits are required.
Double and multiple row bearing arrangments are also available.
Single row cylindrical roller bearings can accommodate heavy radial loads and high speeds. They are manufactured in several different designs,the main difference being in the configuration of the flanges .The most popular are the NU,N,NJ and NUP designs.
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Cylindrical roller bearings have high radial-load capacity and moderate thrust loads. They contain rollers which are cylindrically-shaped, but are not true cylinders. Instead, these rollers are crowned or end-relieved to reduce stress concentrations. This geometry results in low friction and allows for high-speed applications. Cylindrical roller bearings are commonly available in precision grades such as RBEC-5, a classification from the Roller Bearing Engineers Committee (RBEC). RBEC ratings describe the accuracy and tolerance range for different types of bearings. As a rule, the higher the RBEC number, the tighter the bearing tolerances. Typically, cylindrical roller bearings are lubricated with oil, which also serves as a coolant.
Most cylindrical roller bearings are made of alloy steels or low-carbon steels. Some applications require the use of case-hardened or thorough-hardened, high-carbon, bearing-quality steel. High-carbon grades of steel do not require carburizing and can be case-hardened by induction heating or thorough-hardened by conventional heating methods. When low-carbon, carburized grades of steel are used, carbon is introduced after the cylindrical roller bearings are machined to a depth sufficient to produce a hardened case that can sustain bearing loads. The addition of carbon and alloys ensures the proper combination of a hard, fatigue-resistant case and a tough, ductile core.
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Small bore MT bearings improve your design and lower manufacturing costs of manipulators, articulating arms, lift-assists, and balancers. If you develop and manufacture ergonomic lift-assist devices, work positioners, and articulating arms, there’s a Kaydon bearing that can increase your design flexibility. It’s a bolt-up bearing in popular compact sizes, and it eliminates the limitations imposed by traditional king post configurations so only one bearing is required in your assembly instead of two.
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Cylindrical roller bearings have the following key features:
- Single-row (design variants N, NJ, NU and NUP) and double-row (design variants NN and NNU) available
- Cage variants: brass (M6, MA6), polyamide (TVP3), and pressed steel (J - coming soon)
- Suitable for high radial loads
- High speed ratings
- Simple mounting due to the possibility to fit inner and outer rings separately
- Full complement versions available for even higher radial loads
- Standards: DIN 616, DIN 5412 (part 1)
- Application examples: industrial gearboxes, mechanical presses, electrical motors, pumps and compressors, traction motors and axle boxes for railway vehicles, steel mills, etc.
The new NKE series single row cylindrical roller bearings offers unlimited possibilities for your applications. Currently more than 3,000 types of this series are produced in Steyr using a new modular component assembly system. This ensures shortest lead-times for your orders.
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Catalog sizes and engineered to order bearing designs are readily available.
RBEC 5 Precision Class Capacity
Extra Capacity Designs
Multiple Retainer Designs Available
High Temperature Designs Available
Special Features: Notches; Slots; Aligning Features; Carburizing Grade Materials.
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Cylindrical roller bearings (single row)
cage designs: sheet steel cage, TB cage, brass cage or cage of glass-fibre reinforced polyamide 66
special lubrications are possible apart from standard lubrication
bearings are available on request with annular groove with or without retainer ring
various radial clearance groups are available
tapered bores are possible too
designs in tolerance classes P6, P5, P4 are possible
Cylindrical roller bearings (double row)
cage design: brass cage
standard clearance is C1
therefore bearings are not exchangeable
bearings have a special tolerance class HP (high precision)
bearings have a standard tapered bore
On request every outer ring can be supplied with a lubricating nut and lubricating holes.
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Construction of this roller bearing type is the simplest of all radial roller bearings. This bearing type is often used in high-speed applications. Because the inner ring, outer ring, and rollers are in line contact, this bearing type has a large radial load capacity. Various Cylindrical roller bearing configurations are:
N,NJ,NF,NU,RNU : integral ribs (flanges)
NH,NP;NUP;NUH : integral and loose ribs
NN,NNU : double-row bearings
Configurations having integral flanges or loose ribs on both the inner and outer rings can sustain a asmall amount of axial load. Since this bearing type supports axial loads as sliding action between the end of the rollers and flange faces, axial loading is Limited. Double-row Cylindrical roller bearings are used for high-speed, high-accuracy applications such as; main spindle support for lathes, milling machines, machining centers.
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Timken® cylindrical bearings are designed to manage heavy radial loads through expertly designed critical dimensions, such as roller and raceway diameter and contact geometry. Our cylindrical bearings range from small to large bores - with up to four rows of rollers - for a wide range of industrial applications.
Design attributes:
Large bores for integration into heavy-duty industrial applications
Cylindrical rollers accommodate heavy radial loads
OD sizes 180 mm and larger
Potential applications: power generation, oilfield, mining and aggregate processing, gear drives and rolling mills.
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IDEAL FOR DIRECT DRIVES
UNITEC RTB AMS bearings series, with integrated angle measuring system are bidirectional axial-radial combined, designed for rotary tables and spindle heads for machine tools.
To improve performances of applications where RTB bearings series are installed, UNITEC developed new version RTB AMS, integrating AMOSIN precision inductive measuring system.
The manufacturing precision, low resistant torque, high load capacity and stiffness are positioning this bearings range at the top of the market, qualifying them as the most suitable solution for direct drive installations.
UNITEC RTB AMS BEARINGS FEATURES
- Inductive measuring system (NON MAGNETIC)
- Insensitivity to magnetic fields
- Real time output signals (IDEAL FOR DIRECT DRIVES)
- High rotation speed
- High measuring resolution and accuracy
Moreover:
- The most compact solution
- Insensitivity to external agents (IP 67 protected sensors)
- Simple installation
- Quickest setting
- Stable and reliable functioning
- No setting software needed
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Cylindrical roller thrust bearings are designed to operate under heavy axial loads at moderate speeds. They are relatively insensitive to shock loads, are very stiff and require little axial space. As standard they are available as single direction bearings and can only accommodate axial loads acting in one direction.
Cylindrical roller thrust bearings are of separable design, the individual components can be mounted separately. These bearings do not permit any angular misalignment between shaft and housing nor any errors of alignment between the support surfaces in the housing and on the shaft.
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Axial cylindrical roller bearings
Axial cylindrical roller bearings comprise axial cylindrical roller and cage assemblies and shaft and housing locating washers.
The bearings have particularly small axial section height, have high load carrying capacity and high rigidity and can support axial forces in one direction.
Axial cylindrical roller and cage assemblies
Axial cylindrical roller and cage assemblies comprise axial cages with one or two rows of cylindrical rollers. The cage assemblies have particularly small axial section height, high load carrying capacity and high rigidity. They can support axial force from one direction and act as non-locating bearings in a radial direction. Axial cage assemblies are combined with housing or shaft locating washers or are integrated directly in the adjacent construction. If they are used without
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UNITEC is a manufacturing company, certified according to ISO 9001 and belonging to the MONDIAL Group. In addition to the precision bearings for machine tools (crossed roller bearings, combined axial-radial bearings for ball screws and for indexing tables), UNITEC also manufactures bearings for the following applications:
SCREW EXTRUDERS:
- tandem bearings
TEXTILE INDUSTRY:
- special bearings, cam followers, track rollers
PAPER CONVERTING INDUSTRY:
- axial, radial and combined bearings, self-aligning bearings
PRINTING MACHINES
SENDZIMIR ROLLING MILLS
- Double- or 3-row roller bearings
STEEL AND METAL WORKING INDUSTRY
- multi-row roller bearings for cylinders
- chain wheels
- backup rollers for straightening machines
- combined needle roller bearings
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GWG produce large diameter cylindrical roller thrust bearing . In addition to standard items,GWG can make non-standard and custom bearing with shorter lead time than expected.For more information,please view our homepage www.gwgbearings.com
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The cylindrical roller thrust bearing is applied to take axaial loads. It has a high load capacity. The housing washer and the shaft washer of it are made of bearing steel. The cage material can be copper base alloy,aluminum alloy,steel.the cylindrical roller thrust bearings made in NNN use copper base alloy as the basic cage material.Aluminum alloy & carbon steel and plastic are also available on the request of the clients.In that case,some special suffix should be appended to the bearing codes to show the difference.
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Cylindrical roller thrust bearings are separable axial bearings:
- Available in single direction as standard, double direction upon request
- Suitable for high axial loads
- Insensitive to shock loads
- Low to medium speed ratings
- Standards: DIN 616, DIN 722
- Series: 81100, 81200
- Application examples: injection moulding machines, presses, etc.
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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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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 double row taper roller bearings can take up heavy loads.
The basic styles are two row converging TDI configuration and two row diverging TDO configuration.
RKB bearings in TDI configuration have a double cone assembly and two single cups and they are generally supplied with a cup spacer.
The cup spacer is face ground after accurate measurement of the distance to obtain a predetermined internal play. Spacers or components may not be interchanged.
RKB also produces the taper roller steep contact angle TDIS version with higher thrust capacity than the TDI type.
These TDIS bearings have combination of face slots (e.g. N, N1, N2) and bore key-way for locking the cone on the shaft.
Also helical groove in the bore and lubrication grooves in side faces of double cone and/or retention sleeve with annular groove and lubrication holes can be provided.
RKB bearings in TDO configuration have a double cup, two single cone assemblies and can be supplied with a shaft supported cone spacer.
The TDO style bearings are mainly used in a floating cup mounting. Additional features of a lubrication groove and oil holes in the double cup for simplified lubrication through the outer ring are included (suffix CD).
In the TDO type the contact angle diverges, so the rigidity of the shaft mounting is increased.
Bearing sets with steep contact angle and intermediate ring, pierced rollers and steel pin-type cage (TDOS design), bearing sets with extended inner rings which abut each other (TDONA and TDONASW designs), bearing sets with heavy wall cup (TNASWH design) and bearing sets with shields of pressed steel (TDO 4422 design) are also in RKB manufacturing program.
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Double-row Tapered Roller Bearings
Two single-row cups end one double cone; one double cup and two single-row cones.
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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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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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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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IMO Momentenlager, with its modern facilities, manufactures Ball and Roller Slewing Rings in diameters up to 5,200 mm. IMO Ball and Roller Slewing Rings are used for example in the following applications: construction machinery, cranes, tunnel boring machines (TBM's), medical technology, ship building, special purpose machinery, bulk and material handling.
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Plastic does not necessarily mean light duty. In fact, many all-plastic bearings found in a variety of applications such as mobile satellite antenna, are capable of carrying loads in excess of 150kg. The cost effective and lightweight qualities of plastic, coupled with internal steel workings, mean that loads of up to 1000kg are possible whilst maintaining the fl exibility and mass reduction afforded by the use of plastics. BNL’s unrivalled knowledge of plastic bearing technology enables us to choose the right combination of materials for the job.
1. double row crowned pulley with inserted precision steel bearings for belt conveyor of mail sorting application
2. large heavy duty pulley with inserted precision steel bearings
3. heavy duty kicker, incorporating precision steel bearings for a mail sorting machine
4. heavy duty all-plastic bearing, incorporating synchronous belt pulley for satellite TV antenna
5. heavy duty thrust bearing for swivelling offi ce chair
6. double row crowned pulley with inserted precision steel bearings for belt conveyor of mail sorting application
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KH series bearings are designed to provide precise positioning and stopping, with consistent repeatability, in applications where rotation is constant, intermittent or oscillating. They are the ideal bearing for advanced rotary index tables or any design where the bearing will mesh with other precision mechanical components.
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Needle and roller bearings and thrust bearings
