Figure 1 Spherical roller bearing: comparison of load╳ Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.
Fr =
radial load Cr =
basic dynamic load╳ The term dynamic indicates that the operating condition is with the bearing rotating. This is not a variable load. rating
Bearing design
The standard product range of spherical roller bearings comprises:
The bearings are available in the majority of sizes as X-life designs with significantly higher performance ➤ link . Larger catalogue bearings and other bearing designs ➤ GL 1.
Bearings of basic design
✎
The outer ring has a curved raceway
Spherical roller bearings are part of the group of radial roller bearings. These self-retaining rolling bearings have two rows of rollers╳ Barrel-shaped, tapered or cylindrical rolling elements with a mutually curved raceway in the outer ring and two raceways inclined relative to the bearing axis in the inner ring. This raceway design allows these bearings to combine a range of characteristics, which are essential to many applications, in one bearing, such as angular adjustability for example ➤ section . The symmetrical barrel rollers╳ Barrel-shaped, tapered or cylindrical rolling elements are guided by brass, sheet steel or polyamide cages ➤ section .
✎
Roller contact design
The stress╳ Mechanical, mechanical-thermal, mechanical-chemical or tribological influences acting individually or jointly on a component distribution at the contact points between the rollers╳ Barrel-shaped, tapered or cylindrical rolling elements and raceways is determined by the contact surface╳ The contact surface between two bodies under load, calculated according to Hertz of the rollers. As a result, the roller geometry is matched to the raceway. This gives a favourable load╳ Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.
See Contact surface distribution over the entire length of the roller and prevents both edge stresses and stress╳ Mechanical, mechanical-thermal, mechanical-chemical or tribological influences acting individually or jointly on a component peaks at the ends of the roller ➤ Figure 2.
Figure 2 Uniform load╳ Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.
See Contact surface distribution due to optimised roller and raceway profile
F =
load on the rollers
✎
The bore is cylindrical or tapered
Bearings of basic design are supplied without seals╳ Elements intended to prevent the ingress of gaseous, fluid and solid materials through the gaps formed by adjacent components whilst stationary or moving.
See Seal Operating life Friction and with a cylindrical bore. With the exception of series 233..-A, these bearings are also available with a tapered bore ➤ Figure 4.
Bearings with a tapered bore have a bore taper of 1:12 and the suffix K, whereas spherical roller bearings of the series 249, 240 and 241 have a bore taper of 1:30 and the suffix K30➤ Figure 4 and ➤ section .
In addition to the design of the bore (cylindrical or tapered), the specific bearing design is also dependent on the bearing series and bearing size. The key distinguishing features are the:
Bearings with a loose central rib on the inner ring
A loose central rib provides axial guidance of the rollers╳ Barrel-shaped, tapered or cylindrical rolling elements in the load-free zone ➤ Figure 5 and ➤ Table 3. This reduces friction╳ The resistance to relative movement of two bodies in contact with each other; subdivided into friction terms, friction types and friction conditions in the bearing, which in turn leads to lower operating temperatures.
Figure 3 Spherical roller bearings of basic design, cylindrical bore
Table 1 Bearing design for bearings without central rib on inner ring
Design
Suffix
Two sheet steel cages, surface hardened or coated, guidance on outer ring, X-life
E1-XL
One brass double comb cage, guided by rollers, inner ring with two lateral retaining ribs, X-life
E1A-XL-M
Two window cages made from glass fibre reinforced polyamide, guidance on inner ring, X-life
E1-XL-TVPB
Close window
Design
Suffix
Two sheet steel cages, surface hardened or coated, guidance on outer ring, X-life
E1-XL
One brass double comb cage, guided by rollers, inner ring with two lateral retaining ribs, X-life
E1A-XL-M
Two window cages made from glass fibre reinforced polyamide, guidance on inner ring, X-life
E1-XL-TVPB
Table 2 Bearing design for bearings with rigid central rib on inner ring
Design
Suffix
Two brass cages, guidance on inner ring, inner ring with two lateral retaining ribs and one central rib
MB B-MB
One steel double comb cage, guidance on inner ring, inner ring with two lateral retaining ribs and one central rib
B-FB1
Two brass cages, guidance on outer ring, inner ring with two lateral retaining ribs and one central rib
A-MA AS-MA
One brass double comb cage, guidance on outer ring, inner ring with two lateral retaining ribs and one central rib, X-life
XL-MA1
Close window
Design
Suffix
Two brass cages, guidance on inner ring, inner ring with two lateral retaining ribs and one central rib
MB B-MB
One steel double comb cage, guidance on inner ring, inner ring with two lateral retaining ribs and one central rib
B-FB1
Two brass cages, guidance on outer ring, inner ring with two lateral retaining ribs and one central rib
A-MA AS-MA
One brass double comb cage, guidance on outer ring, inner ring with two lateral retaining ribs and one central rib, X-life
XL-MA1
Table 3 Bearing design for bearings with loose central rib
Design
Suffix
Two sheet steel cages, surface hardened, guidance on inner ring, X-life
BE-XL
Two sheet steel cages, surface hardened, guidance on outer ring, X-life, vibrating screen design
BE-XL-JPA-T41A
One brass double comb cage, guidance on inner ring, inner ring with two lateral retaining ribs, X-life
BEA-XL-MB1
Close window
Design
Suffix
Two sheet steel cages, surface hardened, guidance on inner ring, X-life
BE-XL
Two sheet steel cages, surface hardened, guidance on outer ring, X-life, vibrating screen design
BE-XL-JPA-T41A
One brass double comb cage, guidance on inner ring, inner ring with two lateral retaining ribs, X-life
BEA-XL-MB1
Sealed spherical roller bearings
A selection of standard bearings is also available with seals╳ Elements intended to prevent the ingress of gaseous, fluid and solid materials through the gaps formed by adjacent components whilst stationary or moving.
Sealed bearings of series 222 and 223 include an oversize width and the prefix WS in the designation ➤ Figure 6 and ➤ section .
✎
Series 240, 241
The main dimensions of sealed bearings╳ Rolling bearings with fitted seals for protection against lubricant loss and contamination. of series 240 and 241 correspond to the main dimensions of open bearings.
Further information on sealed spherical roller bearings ➤ TPI 218.
Figure 6 Spherical roller bearings of basic design, sealed on both sides
Bearing with contact seal 2RSR (D ＜ 160)
Bearing with contact seal 2VSR(160 ＜ D ≦ 320)
Bearing with contact seal 2RSR(320 ＜ D ≦ 620)
Spherical roller bearings for vibratory machinery
The rolling bearings fitted in vibratory machinery must support not only high loads and high speeds but also accelerations and centrifugal forces. In many cases, these applications involve adverse environmental conditions such as contamination and moisture.
✎
Spherical roller bearings are matched to the operating conditions of vibratory machinery
The special spherical roller bearings developed by Schaeffler are matched to the operating conditions in vibratory machinery and have proved highly successful in practical use. In particular, the cages of the rolling bearings are subjected to stresses arising from high radial accelerations. In unfavourable cases, these may be overlaid by axial accelerations as well.
✎
The support of angular misalignments reduces additional sliding motions
The rotating imbalance generates a rotating shaft deflection╳ The ability to absorb energy over a certain distance, to store this completely or partially as deformation energy and to release the energy when the load is removed (hysteresis) and additional sliding motion within the bearings. This increases the friction╳ The resistance to relative movement of two bodies in contact with each other; subdivided into friction terms, friction types and friction conditions and therefore the operating temperature╳ A measured relubrication interval can be achieved within given limits. The lubricant should be sufficiently thermally stable at the upper operating temperature and should not be too thick at the lower operating temperature. of the bearings. The special spherical roller bearings can support dynamic angular misalignments up to 0,15°.
✎
Basic designs of special spherical roller bearings
Schaeffler special spherical roller bearings for vibratory machinery have the main dimensions of dimension series 23(DIN 616:2000, ISO 15:2017).
✎
Specification T41A (T41D)
Schaeffler spherical roller bearings for vibratory machinery are manufactured in accordance with the specification T41A or T41D ➤ Table 10. This takes into consideration the particular requirements of the application. The specification defines, for example, the tolerances╳ See Running accuracy Dimensional accuracy of the bore and outside diameter, as well as the radial internal clearance of the bearings. The other tolerances╳ See Running accuracy Dimensional accuracy are in accordance with tolerance class Normal to ISO 492:2014.
Schaeffler spherical roller bearings for vibratory machinery are described in detail in TPI 197. This can be requested from Schaeffler.
Bearings with adapter╳ An accessory mounted on another element, for example a lubrication adapter sleeve or withdrawal sleeve
✎
Ready-to-fit mounting kits facilitate the ordering and mounting of bearings
Complete bearing mounting kits are also available for use in locating spherical roller bearings with a tapered bore onto a cylindrical shaft journal. These units comprise the bearing, adapter╳ An accessory mounted on another element, for example a lubrication adapter sleeve, tab washer and locknut, or bearing and withdrawal sleeve ➤ Figure 7. Adapter╳ An accessory mounted on another element, for example a lubrication adapter sleeves and withdrawal sleeves allow bearings to be located on smooth and stepped shafts ➤ Figure 16 and ➤ Figure 17. The fixing elements are described in the product tables and must also be stated when placing the order.
Figure 7 Spherical roller bearing╳ See Rolling bearing with adapter╳ An accessory mounted on another element, for example a lubrication adapter sleeve
Fr =
radial load Fa =
axial load
Spherical roller bearing╳ See Rolling bearing with rigid central rib on inner ring, with adapter╳ An accessory mounted on another element, for example a lubrication adapter sleeve
Adapter sleeve
Locknut
Tab washer
X-life premium quality
Spherical roller bearings are available in numerous series and dimensions as X-life bearings ➤ Figure 8. These bearings exhibit considerably higher performance than conventional spherical roller bearings. This is achieved, for example, through the modified internal construction, higher surface quality╳ See DIN 55 350 part 11 and ISO 8402 for terminology and definitions. of the contact areas, optimised contact geometry between rollers╳ Barrel-shaped, tapered or cylindrical rolling elements and raceways, new roller dimensions with crowned ends and the optimised cage╳ The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements design, as well as through the higher quality╳ See DIN 55 350 part 11 and ISO 8402 for terminology and definitions. of the steel and rolling elements and a loose central rib ➤ Table 3.
These technical enhancements offer a range of advantages, such as:
a more favourable load╳ Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.
See Contact surface distribution in the bearing and thus a higher dynamic load╳ The term dynamic indicates that the operating condition is with the bearing rotating. This is not a variable load. carrying capacity of the bearings ➤ Figure 2
a higher running accuracy╳ Measured in terms of radial runout and axial runout, due to the dimensional and geometrical tolerances of the bearing in motion, defined according to DIN and smooth running
running with reduced friction╳ The resistance to relative movement of two bodies in contact with each other; subdivided into friction terms, friction types and friction conditions and greater energy efficiency
lower heat generation in the bearing
higher possible speeds
lower lubricant╳ Gaseous, fluid, consistent, plastic or solid material for reduction of friction and wear between two friction elements. consumption and therefore longer maintenance╳ Inspection, maintenance and repair of equipment and machines. intervals if relubrication is carried out
In conclusion, these advantages improve the overall cost-efficiency of the bearing position significantly and thus bring about a sustainable increase in the efficiency of the machine and equipment.
✎
Suffix XL
X-life spherical roller bearings include the suffix XL in the designation ➤ section and ➤ dimension table.
Areas of application
Due to their special technical features, X-life spherical roller bearings are highly suitable for bearing arrangements in:
X-life indicates a high product performance density╳ Mass ratio of a lubricant with respect to its volume to DIN 51 757.
Usual units for solid materials (apparent density): - gramms per cubic centimeter g/cm3
fluids: - gramms per millilitre g/ml
gases: - kilogrammes per cubic meter kg/cm3
Other permissible units are kg/dm3, kg/cm3, kg/l and thus a particularly significant benefit to the customer.
Load carrying capacity
✎
Suitable for very high radial loads and high axial loads
Spherical roller bearings can support high axial loads in both directions and very high radial loads. They are designed for very high load╳ Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.
See Contact surface carrying capacity and, since they have the maximum possible number of large and particularly long barrel rollers╳ Barrel-shaped, tapered or cylindrical rolling elements (bearings in E1 design), are also suitable for the heaviest loads ➤ section .
Axial load╳ Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.
See Contact surface carrying capacity of bearings with adapter╳ An accessory mounted on another element, for example a lubrication adapter sleeve or withdrawal sleeve
Due to their internal construction, spherical roller bearings can support high axial loads. Where bearings with adapter╳ An accessory mounted on another element, for example a lubrication adapter sleeves or withdrawal sleeves are located on a smooth shaft without a fixed axial stop (e.g. rigid shoulder), the axial load╳ Force acting in the direction of the shaft. carrying capacity of the bearing arrangement╳ Arrangement of bearings, for example locating/locating, semi-locating/semi-locating, non-locating/non-locating, or semi-locating bearings in tandem, O or X arrangement is dependent on the friction╳ The resistance to relative movement of two bodies in contact with each other; subdivided into friction terms, friction types and friction conditions between the shaft and the sleeve.
If there is any doubt about the axial load╳ Force acting in the direction of the shaft. carrying capacity of the location method, please consult Schaeffler.
Axial load╳ Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.
Friction in the bearing rises with increasing load╳ Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.
Spherical roller bearings support high axial forces from both directions. However, if very high axial loads occur in combination with very high speeds, the resulting increase in friction╳ The resistance to relative movement of two bodies in contact with each other; subdivided into friction terms, friction types and friction conditions and temperature in the bearing must be taken into consideration.
Compensation of angular misalignments
✎
Spherical roller bearings compensate dynamic and static angular misalignments
Due to the concave rolling element╳ Point or rotationally symmetrical bodies for transmitting loads between raceways. raceway in the outer ring, spherical roller bearings are capable of angular adjustment ➤ section . As a result, they permit skewing between the outer and inner ring within certain limits, without causing damage╳ Loss of essential or required characteristics in equipment, machinery or plant or their component parts. to the bearings, and can thus compensate misalignments, shaft deflections and housing╳ See Mounting dimenstions deformations.
Permissible adjustment angle
The permissible adjustment angle is stated for loads P ＜ 0,1 · Cr➤ Table 4. The adjustment angles apply if:
the angular deviation is constant (static angular misalignment)
the rotating component is the inner ring.
The extent to which the stated values can be used in practice is essentially dependent on the design of the bearing arrangement, sealing╳ See Seals etc.
Reduced adjustment angle
If the rotating component is the outer ring, the inner ring undergoes tumbling motion or the adjustment angles are larger than stated in the table, the angular adjustment facility of the bearings is smaller. In such cases, please consult Schaeffler.
Permissible adjustment angle for sealed bearings
✎
The permissible adjustment angle is smaller for sealed bearings
In sealed spherical roller bearings, the angular adjustment facility is 0,5° from the central position. The sealing╳ See Seals function is not adversely affected by misalignments occurring up to this value.
Table 4 Permissible adjustment angle of spherical roller bearings
The bearings can be lubricated via a circumferential groove and lubrication╳ Feed of fresh lubricant to friction points. Fresh lubricant mixes with used lubricant at the friction point. Lubricant feed is by means of lubrication equipment. The time period for relubrication is shorter than that for the lubricant change interval.
In order to ensure good lubrication, most spherical roller bearings have a circumferential groove and three lubrication╳ Feed of fresh lubricant to friction points. Fresh lubricant mixes with used lubricant at the friction point. Lubricant feed is by means of lubrication equipment. The time period for relubrication is shorter than that for the lubricant change interval.
Bearings of series 213 with a bore diameter d ≦ 35 mm do not have a lubrication╳ Feed of fresh lubricant to friction points. Fresh lubricant mixes with used lubricant at the friction point. Lubricant feed is by means of lubrication equipment. The time period for relubrication is shorter than that for the lubricant change interval.
Open spherical roller bearings are not greased. These bearings must be lubricated with oil╳ Fluid lubricant with a mineral oil and/or synthetic oil base, usually with active ingredients or additives. or grease.
If shafts with a vertical axis are supported using spherical roller bearings, particular attention must be paid to ensuring the reliable provision of lubricant╳ Gaseous, fluid, consistent, plastic or solid material for reduction of friction and wear between two friction elements. to the bearings.
✎
Compatibility with plastic cages
When using bearings with plastic cages, compatibility between the lubricant╳ Gaseous, fluid, consistent, plastic or solid material for reduction of friction and wear between two friction elements. and the cage╳ The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements material must be ensured if synthetic oils, lubricating greases╳ Consistent grease with a mineral oil and/or synthetic oil base with thickener as well as active ingredients or additives. See DIN 51 825 part 1 for demands on greases, grease type K, operating temperature range -20 to 140°C or DIN 51 825 part 2, for grease type KT. with a synthetic oil╳ Fluid lubricant with a mineral oil and/or synthetic oil base, usually with active ingredients or additives. base or lubricants containing a high proportion of EP additives are used.
Aged oil╳ Fluid lubricant with a mineral oil and/or synthetic oil base, usually with active ingredients or additives. and additives╳ Lubricant additive to improve viscosity-temperature behaviour or pour point, prevent corrosion, oxidation or ageing or reduce wear or foaming in the oil╳ Fluid lubricant with a mineral oil and/or synthetic oil base, usually with active ingredients or additives. can impair the operating life╳ See Life, rating of plastics at high temperatures. As a result, stipulated oil change╳ See Lubricant change intervals must be strictly observed.
Lubrication-specific suffixes
✎
Suffixes
H40
without lubrication╳ Feed of fresh lubricant to friction points. Fresh lubricant mixes with used lubricant at the friction point. Lubricant feed is by means of lubrication equipment. The time period for relubrication is shorter than that for the lubricant change interval.
6 lubrication holes and one lubrication╳ Feed of fresh lubricant to friction points. Fresh lubricant mixes with used lubricant at the friction point. Lubricant feed is by means of lubrication equipment. The time period for relubrication is shorter than that for the lubricant change interval.
lubrication groove and lubrication╳ Feed of fresh lubricant to friction points. Fresh lubricant mixes with used lubricant at the friction point. Lubricant feed is by means of lubrication equipment. The time period for relubrication is shorter than that for the lubricant change interval.
3 lubrication holes in the outer ring, no lubrication╳ Feed of fresh lubricant to friction points. Fresh lubricant mixes with used lubricant at the friction point. Lubricant feed is by means of lubrication equipment. The time period for relubrication is shorter than that for the lubricant change interval.
without lubrication╳ Feed of fresh lubricant to friction points. Fresh lubricant mixes with used lubricant at the friction point. Lubricant feed is by means of lubrication equipment. The time period for relubrication is shorter than that for the lubricant change interval.
6 lubrication holes and one lubrication╳ Feed of fresh lubricant to friction points. Fresh lubricant mixes with used lubricant at the friction point. Lubricant feed is by means of lubrication equipment. The time period for relubrication is shorter than that for the lubricant change interval.
lubrication groove and lubrication╳ Feed of fresh lubricant to friction points. Fresh lubricant mixes with used lubricant at the friction point. Lubricant feed is by means of lubrication equipment. The time period for relubrication is shorter than that for the lubricant change interval.
3 lubrication holes in the outer ring, no lubrication╳ Feed of fresh lubricant to friction points. Fresh lubricant mixes with used lubricant at the friction point. Lubricant feed is by means of lubrication equipment. The time period for relubrication is shorter than that for the lubricant change interval.
Figure 9 Lubrication of the bearing via a lubrication╳ Feed of fresh lubricant to friction points. Fresh lubricant mixes with used lubricant at the friction point. Lubricant feed is by means of lubrication equipment. The time period for relubrication is shorter than that for the lubricant change interval.
Lubrication groove with lubrication╳ Feed of fresh lubricant to friction points. Fresh lubricant mixes with used lubricant at the friction point. Lubricant feed is by means of lubrication equipment. The time period for relubrication is shorter than that for the lubricant change interval.
Sealed bearings are supplied already filled with a high quality╳ See DIN 55 350 part 11 and ISO 8402 for terminology and definitions.lithium soap grease╳ Lubricating grease based on lithium soap, mineral oil and/or synthetic oil with a mineral oil╳ Oil derived from crude oil and prepared for use as a lubricant by distillation and refining. Chemical composition mainly hydrocarbons. base and are maintenance-free for most applications. Whether or not a bearing requires relubrication during its operating life╳ See Life, rating is dependent on the operating conditions (e.g. on the operating temperatures and operating speeds). Where bearings cannot be relubricated, the grease╳ See Lubricant Grease cartridge Fatty acidsoperating life╳ See Life, rating must be observed.
Sealing
✎
Certain bearings are also available with seals
Sealed spherical roller bearings have sealing╳ See Seals shields on both sides, which protect the bearing reliably against contamination. In order to ensure optimum sealing╳ See Seals integrity, various sealing╳ See Seals concepts are used, which are determined by size. The bearings should not be heated above +80 °C or washed out prior to mounting.
Series 240, 241
✎
The seal╳ Elements such as axial face seal, labyrinth seal, rotary shaft seal or gap seal which prevent the ingress of gaseous, liquid and solid materials through the gaps between combined components during movement or whilst stationary material used is FKM
For spherical roller bearings of series 240 and 241, the standard seal╳ Elements such as axial face seal, labyrinth seal, rotary shaft seal or gap seal which prevent the ingress of gaseous, liquid and solid materials through the gaps between combined components during movement or whilst stationary material is fluoro elastomer.
Seals made from fluoro elastomer, such as Viton (FKM, FPM) for example, comprise particularly high performance materials which, when heated above approx. +300 °C, may release vapours and gases that are harmful to health if they are inhaled or come into contact with the eyes. Contact with seals╳ Elements intended to prevent the ingress of gaseous, fluid and solid materials through the gaps formed by adjacent components whilst stationary or moving.
See Seal Operating life Friction which have been heated to such high temperatures is still dangerous even after cooling. Contact with skin must be avoided in all cases. A doctor must be consulted immediately if such vapours are inhaled. In all cases, the user is responsible for the safe handling of the seals╳ Elements intended to prevent the ingress of gaseous, fluid and solid materials through the gaps formed by adjacent components whilst stationary or moving.
See Seal Operating life Friction during the operating life, as well as for scrapping the seals╳ Elements intended to prevent the ingress of gaseous, fluid and solid materials through the gaps formed by adjacent components whilst stationary or moving.
Such temperatures may occur, for example, if a welding torch is used in the dismantling of a bearing. In these cases, the currently valid safety data sheet must be observed.
Speeds
Two speeds are indicated in the product tables ➤ dimension table:
the kinematic limiting speed nG
the thermal speed rating nϑr.
Limiting speeds
The limiting speed nG is the kinematically permissible speed of the bearing. Even under favourable mounting and operating conditions, this value should not be exceeded without prior consultation with Schaeffler
➤ link.
Reference speeds
✎
nϑr is used to calculate nϑ
The thermal speed rating nϑr is not an application-oriented speed limit, but is a calculated ancillary value for determining the thermally safe operating speed nϑ➤ link.
✎
Bearings with contact seals
For bearings with contact seals, no reference speeds are defined in accordance with DIN ISO 15312:2004. As a result, only the limiting speed nG is given in the product tables for these bearings.
Noise
Schaeffler Noise Index
The Schaeffler Noise Index (SGI) is not yet available for this bearing type
➤ link. The data for these bearing series will be introduced and updated in stages.
Temperature range
The operating temperature╳ A measured relubrication interval can be achieved within given limits. The lubricant should be sufficiently thermally stable at the upper operating temperature and should not be too thick at the lower operating temperature. of the bearings is limited by:
the dimensional stability of the bearing rings and rolling elements
the cage
the lubricant
the seals.
Possible operating temperatures of spherical roller bearings ➤ Table 5.
Table 5 Permissible temperature ranges
Operating temperature
Open spherical roller bearings
Sealed spherical roller bearings
with brass or sheet steel cage
with polyamide cage PA66
Series 222, 223
Series 240, 241
–30 °C to +200 °C
–30 °C to +120 °C
–40 °C to +100 °C, for short periods up to +120 °C, limited by the lubricant╳ Gaseous, fluid, consistent, plastic or solid material for reduction of friction and wear between two friction elements. and seal material
–30 °C to +180 °C, for short periods up to +200 °C, limited by the lubricant╳ Gaseous, fluid, consistent, plastic or solid material for reduction of friction and wear between two friction elements. and seal material
Close window
Operating temperature
Open spherical roller bearings
Sealed spherical roller bearings
with brass or sheet steel cage
with polyamide cage PA66
Series 222, 223
Series 240, 241
–30 °C to +200 °C
–30 °C to +120 °C
–40 °C to +100 °C, for short periods up to +120 °C, limited by the lubricant╳ Gaseous, fluid, consistent, plastic or solid material for reduction of friction and wear between two friction elements. and seal material
–30 °C to +180 °C, for short periods up to +200 °C, limited by the lubricant╳ Gaseous, fluid, consistent, plastic or solid material for reduction of friction and wear between two friction elements. and seal material
In the event of anticipated temperatures which lie outside the stated values, please contact Schaeffler.
Cages
✎
Solid brass cages are used as standard
Standard cages for spherical roller bearings ➤ Table 1, ➤ Table 2, ➤ Table 3, ➤ Table 6. Other cage╳ The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements designs are available by agreement. With such cages, however, suitability for high speeds and temperatures as well as the basic load╳ Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.
See Contact surface ratings may differ from the values for the bearings with standard cages. Essential information on cages
➤ link.
Cages in design B and in bearings without a suffix
✎
Solid brass cage╳ The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements or sheet metal cage
Spherical roller bearings with a rigid central rib on the inner ring (design B or bearings without a suffix) have a solid brass cage. Bearings without a cage╳ The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elementssuffix╳ Addition to the designation, consisting of letters and/or numbers, for example, it may indicate variants of a series have sheet metal cages ➤ Table 2 and ➤ Table 6.
Cages in bearings with the suffix╳ Addition to the designation, consisting of letters and/or numbers, for example, it may indicate variants of a seriesMB/MB1, MA/MA1
✎
Solid brass cage
Bearings with the suffix MB or MB1 have solid brass cages, which are guided on the inner ring. In bearings with the suffix MA or MA1, the solid brass cages are guided on the outer ring ➤ Table 2, ➤ Table 3 and ➤ Table 6.
Bearings with the suffix M
✎
Solid brass cage
Bearings with the suffix M have a roller-guided solid brass cage ➤ Table 1 and ➤ Table 6.
Bearings with the suffix E1/BE
✎
Sheet steel cage, solid brass cage╳ The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements or solid cage╳ The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements made from polyamide PA66
Bearings with the suffix E1 and BE and without a cage╳ The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elementssuffix╳ Addition to the designation, consisting of letters and/or numbers, for example, it may indicate variants of a series have sheet steel cages. The two cage╳ The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements halves are retained by a guiding ring or loose central rib in the outer or inner ring ➤ Table 1 and ➤ Table 6. The other bearings of E1 design have solid cages made from glass fibre reinforced polyamide PA66 or solid brass cages (suffix TVPB or M). The sheet steel cages are surface hardened or coated and, as a result, are particularly well protected against wear.
Table 6 Cage, cage╳ The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements suffix, bore code
For high continuous temperatures and applications with difficult operating conditions, bearings with brass or sheet steel cages should be used. If there is any uncertainty regarding cage╳ The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements suitability, please consult Schaeffler.
Internal clearance
Radial internal clearance
✎
The standard is CN
Spherical roller bearings with cylindrical and tapered bore are manufactured as standard with radial internal clearance CN (normal) ➤ Table 7 and ➤ Table 8.
A number of bearings are also available by agreement with the smaller internal clearance C2 and with the larger internal clearance C3 and C4➤ Table 7 and ➤ Table 8.
Spherical roller bearings with cylindrical bore
The values for radial internal clearance correspond to DIN 620-4:2004(ISO 5753-1:2009)➤ Table 7. They are valid for bearings which are free from load╳ Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.
See Contact surface and measurement forces (without elastic deformation).
Table 7 Radial internal clearance of spherical roller bearings with cylindrical bore
Nominal bore diameter
Radial internal clearance
d
C2 (Group 2)
CN (Group N)
C3 (Group 3)
C4 (Group 4)
mm
μm
μm
μm
μm
over
incl.
min.
max.
min.
max.
min.
max.
min.
max.
18
24
10
20
20
35
35
45
45
60
24
30
15
25
25
40
40
55
55
75
30
40
15
30
30
45
45
60
60
80
40
50
20
35
35
55
55
75
75
100
50
65
20
40
40
65
65
90
90
120
65
80
30
50
50
80
80
110
110
145
80
100
35
60
60
100
100
135
135
180
100
120
40
75
75
120
120
160
160
210
120
140
50
95
95
145
145
190
190
240
140
160
60
110
110
170
170
220
220
280
160
180
65
120
120
180
180
240
240
310
180
200
70
130
130
200
200
260
260
340
200
225
80
140
140
220
220
290
290
380
225
250
90
150
150
240
240
320
320
420
250
280
100
170
170
260
260
350
350
460
280
315
110
190
190
280
280
370
370
500
315
355
120
200
200
310
310
410
410
550
355
400
130
220
220
340
340
450
450
600
400
450
140
240
240
370
370
500
500
660
450
500
140
260
260
410
410
550
550
720
500
560
150
280
280
440
440
600
600
780
560
630
170
310
310
480
480
650
650
850
630
710
190
350
350
530
530
700
700
920
710
800
210
390
390
580
580
770
770
1010
800
900
230
430
430
650
650
860
860
1120
900
1000
260
480
480
710
710
930
930
1220
1000
1120
290
530
530
770
770
1050
1050
1430
1120
1250
320
580
580
840
840
1140
1140
1560
1250
1400
350
630
630
910
910
1240
1240
1700
1400
1600
380
700
700
1020
1020
1390
1390
1890
1600
1800
420
780
780
1140
1140
1550
1550
2 090
Close window
Nominal bore diameter
Radial internal clearance
d
C2 (Group 2)
CN (Group N)
C3 (Group 3)
C4 (Group 4)
mm
μm
μm
μm
μm
over
incl.
min.
max.
min.
max.
min.
max.
min.
max.
18
24
10
20
20
35
35
45
45
60
24
30
15
25
25
40
40
55
55
75
30
40
15
30
30
45
45
60
60
80
40
50
20
35
35
55
55
75
75
100
50
65
20
40
40
65
65
90
90
120
65
80
30
50
50
80
80
110
110
145
80
100
35
60
60
100
100
135
135
180
100
120
40
75
75
120
120
160
160
210
120
140
50
95
95
145
145
190
190
240
140
160
60
110
110
170
170
220
220
280
160
180
65
120
120
180
180
240
240
310
180
200
70
130
130
200
200
260
260
340
200
225
80
140
140
220
220
290
290
380
225
250
90
150
150
240
240
320
320
420
250
280
100
170
170
260
260
350
350
460
280
315
110
190
190
280
280
370
370
500
315
355
120
200
200
310
310
410
410
550
355
400
130
220
220
340
340
450
450
600
400
450
140
240
240
370
370
500
500
660
450
500
140
260
260
410
410
550
550
720
500
560
150
280
280
440
440
600
600
780
560
630
170
310
310
480
480
650
650
850
630
710
190
350
350
530
530
700
700
920
710
800
210
390
390
580
580
770
770
1010
800
900
230
430
430
650
650
860
860
1120
900
1000
260
480
480
710
710
930
930
1220
1000
1120
290
530
530
770
770
1050
1050
1430
1120
1250
320
580
580
840
840
1140
1140
1560
1250
1400
350
630
630
910
910
1240
1240
1700
1400
1600
380
700
700
1020
1020
1390
1390
1890
1600
1800
420
780
780
1140
1140
1550
1550
2 090
Spherical roller bearings with tapered bore
The values for radial internal clearance correspond to DIN 620-4:2004(ISO 5753-1:2009)➤ Table 8. These are valid for bearings which are free from load╳ Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.
See Contact surface and measurement forces (without elastic deformation).
Table 8 Radial internal clearance of spherical roller bearings with tapered bore
Nominal bore diameter
Radial internal clearance
d
C2 (Group 2)
CN (Group N)
C3 (Group 3)
C4 (Group 4)
mm
μm
μm
μm
μm
over
incl.
min.
max.
min.
max.
min.
max.
min.
max.
18
24
15
25
25
35
35
45
45
60
24
30
20
30
30
40
40
55
55
75
30
40
25
35
35
50
50
65
65
85
40
50
30
45
45
60
60
80
80
100
50
65
40
55
55
75
75
95
95
120
65
80
50
70
70
95
95
120
120
150
80
100
55
80
80
110
110
140
140
180
100
120
65
100
100
135
135
170
170
220
120
140
80
120
120
160
160
200
200
260
140
160
90
130
130
180
180
230
230
300
160
180
100
140
140
200
200
260
260
340
180
200
110
160
160
220
220
290
290
370
200
225
120
180
180
250
250
320
320
410
225
250
140
200
200
270
270
350
350
450
250
280
150
220
220
300
300
390
390
490
280
315
170
240
240
330
330
430
430
540
315
355
190
270
270
360
360
470
470
590
355
400
210
300
300
400
400
520
520
650
400
450
230
330
330
440
440
570
570
720
450
500
260
370
370
490
490
630
630
790
500
560
290
410
410
540
540
680
680
870
560
630
320
460
460
600
600
760
760
980
630
710
350
510
510
670
670
850
850
1090
710
800
390
570
570
750
750
960
960
1220
800
900
440
640
640
840
840
1070
1070
1370
900
1000
490
710
710
930
930
1190
1190
1520
1000
1120
540
780
780
1020
1020
1300
1300
1650
1120
1250
600
860
860
1120
1120
1420
1420
1800
1250
1400
660
940
940
1220
1220
1550
1550
1960
1400
1600
740
1060
1060
1380
1380
1750
1750
2 200
1600
1800
820
1180
1180
1540
1540
1950
1950
2 500
Close window
Nominal bore diameter
Radial internal clearance
d
C2 (Group 2)
CN (Group N)
C3 (Group 3)
C4 (Group 4)
mm
μm
μm
μm
μm
over
incl.
min.
max.
min.
max.
min.
max.
min.
max.
18
24
15
25
25
35
35
45
45
60
24
30
20
30
30
40
40
55
55
75
30
40
25
35
35
50
50
65
65
85
40
50
30
45
45
60
60
80
80
100
50
65
40
55
55
75
75
95
95
120
65
80
50
70
70
95
95
120
120
150
80
100
55
80
80
110
110
140
140
180
100
120
65
100
100
135
135
170
170
220
120
140
80
120
120
160
160
200
200
260
140
160
90
130
130
180
180
230
230
300
160
180
100
140
140
200
200
260
260
340
180
200
110
160
160
220
220
290
290
370
200
225
120
180
180
250
250
320
320
410
225
250
140
200
200
270
270
350
350
450
250
280
150
220
220
300
300
390
390
490
280
315
170
240
240
330
330
430
430
540
315
355
190
270
270
360
360
470
470
590
355
400
210
300
300
400
400
520
520
650
400
450
230
330
330
440
440
570
570
720
450
500
260
370
370
490
490
630
630
790
500
560
290
410
410
540
540
680
680
870
560
630
320
460
460
600
600
760
760
980
630
710
350
510
510
670
670
850
850
1090
710
800
390
570
570
750
750
960
960
1220
800
900
440
640
640
840
840
1070
1070
1370
900
1000
490
710
710
930
930
1190
1190
1520
1000
1120
540
780
780
1020
1020
1300
1300
1650
1120
1250
600
860
860
1120
1120
1420
1420
1800
1250
1400
660
940
940
1220
1220
1550
1550
1960
1400
1600
740
1060
1060
1380
1380
1750
1750
2 200
1600
1800
820
1180
1180
1540
1540
1950
1950
2 500
Dimensions, tolerances
Dimension standards
The main dimensions of spherical roller bearings correspond to DIN 635‑2:2009, DIN 616:2000 and ISO 15:2017.
For spherical roller bearings with the suffixes BE and BEA, the width tolerances╳ See Running accuracy Dimensional accuracy are reduced by half compared to the standard values. Values ➤ Table 9. The running accuracy╳ Measured in terms of radial runout and axial runout, due to the dimensional and geometrical tolerances of the bearing in motion, defined according to DIN corresponds to tolerance class 5.
Spherical roller bearings to specification T41A and T41D have restricted tolerances╳ See Running accuracy Dimensional accuracy for the inside and outside diameter ➤ Table 10. In bearings with a tapered bore, the reduced tolerance range applies to the outside diameter only.
Tolerance symbols ➤ Table U =
upper limit deviation L =
lower limit deviation
Chamfer dimensions
The limiting dimensions for chamfer dimensions correspond to DIN 620‑6:2004. Overview and limiting values
➤ section. Nominal value of chamfer dimension ➤ dimension table.
Tolerances
The tolerances╳ See Running accuracy Dimensional accuracy for the dimensional and running accuracy╳ Measured in terms of radial runout and axial runout, due to the dimensional and geometrical tolerances of the bearing in motion, defined according to DIN of spherical roller bearings correspond to tolerance class Normal in accordance with ISO 492:2014. Tolerance values ➤ Table . The tolerance values for tapered bores with a taper angle 1:12 correspond to ISO 492➤ Table ; the tolerance values for tapered bores with a taper angle 1:30 correspond to ➤ Table . The running tolerances╳ See Running accuracy Dimensional accuracy for spherical roller bearings with the suffixes BE and BEA correspond to tolerance class 5. Tolerance values in accordance with ISO 492➤ Table .
For bearing arrangements with higher requirements for dimensional and running accuracy, spherical roller bearings are available with the tolerance class 5 to ISO 492:2014. In such cases, please consult Schaeffler.
Suffixes
For a description of the suffixes used in this chapter ➤ Table 11 and medias interchange http://www.schaeffler.de/std/1D52.
Table 11 Suffixes and corresponding descriptions
Suffix
Description of suffix
A-MA, AS-MA
Two brass cages, guidance on outer ring, inner ring with two lateral retaining ribs and one central rib
Standard combinations
B-FB1
One steel cage, guidance on inner ring, inner ring with two lateral retaining ribs and one central rib
BE-XL
Two sheet steel cages, surface hardened, guidance on inner ring, X-life
BE-XL-JPA
Two sheet steel cages, surface hardened, guidance on outer ring, X-life
BEA-XL-MB1
One brass double comb cage, guidance on inner ring, inner ring with two lateral retaining ribs, X-life
E1-XL
Two sheet steel cages, surface hardened or coated, guidance on outer ring, X-life
E1-XL-TVPB
Two window cages made from glass fibre reinforced polyamide, guidance on inner ring, X-life
E1A-XL-M
One brass double comb cage, guided by rollers, inner ring with two lateral retaining ribs, X-life
MB, B-MB
Two brass cages, guidance on inner ring, inner ring with two lateral retaining ribs and one central rib
MA1
One brass cage, guidance on outer ring, inner ring with two lateral retaining ribs and one central rib
2RSR
Contact seal╳ Elements such as axial face seal, labyrinth seal, rotary shaft seal or gap seal which prevent the ingress of gaseous, liquid and solid materials through the gaps between combined components during movement or whilst stationary (lip seal) on both sides with sheet steel reinforcement, made from nitrile rubber (NBR); grease fill level 25% to 40%, filled with high pressure grease
Standard
2VSR
Contact seal╳ Elements such as axial face seal, labyrinth seal, rotary shaft seal or gap seal which prevent the ingress of gaseous, liquid and solid materials through the gaps between combined components during movement or whilst stationary (lip seal) on both sides with sheet steel reinforcement, made from fluoro rubber (FKM); grease fill level 60% to 100%, filled with high temperature grease
continued ▼
Close window
Suffix
Description of suffix
A-MA, AS-MA
Two brass cages, guidance on outer ring, inner ring with two lateral retaining ribs and one central rib
Standard combinations
B-FB1
One steel cage, guidance on inner ring, inner ring with two lateral retaining ribs and one central rib
BE-XL
Two sheet steel cages, surface hardened, guidance on inner ring, X-life
BE-XL-JPA
Two sheet steel cages, surface hardened, guidance on outer ring, X-life
BEA-XL-MB1
One brass double comb cage, guidance on inner ring, inner ring with two lateral retaining ribs, X-life
E1-XL
Two sheet steel cages, surface hardened or coated, guidance on outer ring, X-life
E1-XL-TVPB
Two window cages made from glass fibre reinforced polyamide, guidance on inner ring, X-life
E1A-XL-M
One brass double comb cage, guided by rollers, inner ring with two lateral retaining ribs, X-life
MB, B-MB
Two brass cages, guidance on inner ring, inner ring with two lateral retaining ribs and one central rib
MA1
One brass cage, guidance on outer ring, inner ring with two lateral retaining ribs and one central rib
2RSR
Contact seal╳ Elements such as axial face seal, labyrinth seal, rotary shaft seal or gap seal which prevent the ingress of gaseous, liquid and solid materials through the gaps between combined components during movement or whilst stationary (lip seal) on both sides with sheet steel reinforcement, made from nitrile rubber (NBR); grease fill level 25% to 40%, filled with high pressure grease
Standard
2VSR
Contact seal╳ Elements such as axial face seal, labyrinth seal, rotary shaft seal or gap seal which prevent the ingress of gaseous, liquid and solid materials through the gaps between combined components during movement or whilst stationary (lip seal) on both sides with sheet steel reinforcement, made from fluoro rubber (FKM); grease fill level 60% to 100%, filled with high temperature grease
continued ▼
Table 12 Suffixes and corresponding descriptions
Suffix
Description of suffix
C2
Radial internal clearance C2 (smaller than normal)
Available by agreement
C3
Radial internal clearance C3 (larger than normal)
C4
Radial internal clearance C4 (larger than C3)
H40
Without lubrication╳ Feed of fresh lubricant to friction points. Fresh lubricant mixes with used lubricant at the friction point. Lubricant feed is by means of lubrication equipment. The time period for relubrication is shorter than that for the lubricant change interval.
6 lubrication holes and one lubrication╳ Feed of fresh lubricant to friction points. Fresh lubricant mixes with used lubricant at the friction point. Lubricant feed is by means of lubrication equipment. The time period for relubrication is shorter than that for the lubricant change interval.
3 uniformly distributed threaded holes in one end face of the outer ring (* weight-oriented module letter, please contact us)
H151
One 45° retaining slot in the outer ring
H151B
One 15° retaining slot in the outer ring
K
Tapered bore, taper 1:12
K30
Tapered bore, taper 1:30
P5
Dimensional and running accuracy╳ Measured in terms of radial runout and axial runout, due to the dimensional and geometrical tolerances of the bearing in motion, defined according to DIN in accordance with ISOtolerance class 5
S
Lubrication groove and lubrication╳ Feed of fresh lubricant to friction points. Fresh lubricant mixes with used lubricant at the friction point. Lubricant feed is by means of lubrication equipment. The time period for relubrication is shorter than that for the lubricant change interval.
3 lubrication holes in the outer ring, no lubrication╳ Feed of fresh lubricant to friction points. Fresh lubricant mixes with used lubricant at the friction point. Lubricant feed is by means of lubrication equipment. The time period for relubrication is shorter than that for the lubricant change interval.
For oscillating load╳ Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.
See Contact surface with restricted diameter tolerances, radial internal clearance C4
T41D
For oscillating load╳ Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.
See Contact surface with restricted diameter tolerances, radial internal clearance C4, bore with thin chromium coating
W209B
Inner ring made from case hardening steel
XL
X-life bearing
continued ▲
Close window
Suffix
Description of suffix
C2
Radial internal clearance C2 (smaller than normal)
Available by agreement
C3
Radial internal clearance C3 (larger than normal)
C4
Radial internal clearance C4 (larger than C3)
H40
Without lubrication╳ Feed of fresh lubricant to friction points. Fresh lubricant mixes with used lubricant at the friction point. Lubricant feed is by means of lubrication equipment. The time period for relubrication is shorter than that for the lubricant change interval.
6 lubrication holes and one lubrication╳ Feed of fresh lubricant to friction points. Fresh lubricant mixes with used lubricant at the friction point. Lubricant feed is by means of lubrication equipment. The time period for relubrication is shorter than that for the lubricant change interval.
3 uniformly distributed threaded holes in one end face of the outer ring (* weight-oriented module letter, please contact us)
H151
One 45° retaining slot in the outer ring
H151B
One 15° retaining slot in the outer ring
K
Tapered bore, taper 1:12
K30
Tapered bore, taper 1:30
P5
Dimensional and running accuracy╳ Measured in terms of radial runout and axial runout, due to the dimensional and geometrical tolerances of the bearing in motion, defined according to DIN in accordance with ISOtolerance class 5
S
Lubrication groove and lubrication╳ Feed of fresh lubricant to friction points. Fresh lubricant mixes with used lubricant at the friction point. Lubricant feed is by means of lubrication equipment. The time period for relubrication is shorter than that for the lubricant change interval.
3 lubrication holes in the outer ring, no lubrication╳ Feed of fresh lubricant to friction points. Fresh lubricant mixes with used lubricant at the friction point. Lubricant feed is by means of lubrication equipment. The time period for relubrication is shorter than that for the lubricant change interval.
For oscillating load╳ Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.
See Contact surface with restricted diameter tolerances, radial internal clearance C4
T41D
For oscillating load╳ Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.
See Contact surface with restricted diameter tolerances, radial internal clearance C4, bore with thin chromium coating
W209B
Inner ring made from case hardening steel
XL
X-life bearing
continued ▲
Structure of bearing designation
✎
Examples of composition of bearing designation
The designation╳ Identification of a bearing by letters and numbers, indicating, for example, the series, dimensional series or size code, bore diameter, bearing design and information such as Corrotect plating or length of guideways of bearings follows a set model. Examples ➤ Figure 10 to ➤ Figure 13. The composition of designations is subject to DIN 623-1➤ Figure.
Figure 10 Spherical roller bearing╳ See Rolling bearing with cylindrical bore, without central rib on inner ring: designation╳ Identification of a bearing by letters and numbers, indicating, for example, the series, dimensional series or size code, bore diameter, bearing design and information such as Corrotect plating or length of guideways structure
Figure 11 Spherical roller bearing╳ See Rolling bearing for vibratory machinery, with cylindrical bore, without central rib on inner ring, to specification T41A: designation╳ Identification of a bearing by letters and numbers, indicating, for example, the series, dimensional series or size code, bore diameter, bearing design and information such as Corrotect plating or length of guideways structure
Figure 12 Spherical roller bearing╳ See Rolling bearing with tapered bore, rigid central rib on inner ring: designation╳ Identification of a bearing by letters and numbers, indicating, for example, the series, dimensional series or size code, bore diameter, bearing design and information such as Corrotect plating or length of guideways structure
Figure 13 Spherical roller bearing╳ See Rolling bearing with tapered bore and adapter╳ An accessory mounted on another element, for example a lubrication adapter sleeve, without central rib on inner ring: designation╳ Identification of a bearing by letters and numbers, indicating, for example, the series, dimensional series or size code, bore diameter, bearing design and information such as Corrotect plating or length of guideways structure
Dimensioning
Equivalent dynamic bearing load
✎
P = a substitute force for combined load╳ Indication of a force acting in a non-perpendicular direction on the bearing. Load angle b not equal to 0° or 90°. and various load╳ Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.
The basic rating life╳ The basic rating life is the life reached or exceeded by 90% of a sufficiently large group of apparently identical bearings before the first evidence of material fatigue develops equation L = (C/P)p used in the dimensioning of bearings under dynamic load╳ The term dynamic indicates that the operating condition is with the bearing rotating. This is not a variable load. assumes a load╳ Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.
See Contact surface of constant magnitude and direction. In radial bearings, this is a purely radial load. If this condition is not met, an equivalent dynamic bearing load P must be determined for the rating life╳ The basic rating life is the life reached or exceeded by 90% of a sufficiently large group of apparently identical bearings before the first evidence of material fatigue develops calculation. In the case of radial bearings, this is a radial load╳ A force which acts at an angle of b = 0°. of constant magnitude and direction, which has the same effect on the rating life╳ The basic rating life is the life reached or exceeded by 90% of a sufficiently large group of apparently identical bearings before the first evidence of material fatigue develops as the load╳ Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.
For spherical roller bearings subjected to static load╳ Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.
In addition to the basic rating life L (L10h, Lhmr), it is also always necessary to check the static load╳ Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.
Equation 4 Static Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.See Contact surface safety factor
Legend
S0
Static load╳ Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.
Axial load╳ Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.
See Contact surface carrying capacity of bearings with adapter╳ An accessory mounted on another element, for example a lubrication adapter sleeve
Where bearings with adapter╳ An accessory mounted on another element, for example a lubrication adapter sleeves are located on a smooth shaft without a fixed axial stop (e.g. rigid shoulder), their axial load╳ Force acting in the direction of the shaft. carrying capacity is dependent on the friction╳ The resistance to relative movement of two bodies in contact with each other; subdivided into friction terms, friction types and friction conditions between the shaft and the sleeve ➤ section .
If there is any doubt about the axial load╳ Force acting in the direction of the shaft. carrying capacity of the location method, please consult Schaeffler.
Minimum load
✎
In continuous operation, a minimum load╳ Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.
In order that no slippage occurs between the contact partners, the spherical roller bearings must be constantly subjected to a sufficiently high radial load. Based on experience, a minimum radial load╳ A force which acts at an angle of b = 0°. of the order of P = C0r/100 is thus necessary for continuous operation.
If the minimum radial load╳ A force which acts at an angle of b = 0°. is lower than indicated above, please consult Schaeffler.
Design of bearing arrangements
✎
Support bearing rings over their entire circumference and width
In order to allow full utilisation of the load╳ Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.
See Contact surface carrying capacity of the bearings and thus also achieve the requisite rating life, the bearing rings must be rigidly and uniformly supported by means of contact surfaces╳ The effective surface is the surface which separates the object from its surrounding medium.The actual surface is the approximate image from measuring technology of the ideal geometric surface. Note: various measuring processes or measuring conditions (e.g. stylus radius) can give different actual surfaces.The geometric surface is an ideal surface whose nominal form is defined by a drawing or other technical documentation. See DIN 4760 for further details.
See Surface protection Surface tension over their entire circumference and over the entire width of the raceway. Support can be provided by means of a cylindrical or tapered seating surface ➤ Figure 16 to ➤ Figure 18. The accuracy╳ Deviation of the actual dimension from the nominal dimension as described by tolerances. For monorail systems, the parallel deviation of the reference surfaces within given tolerances.
For secure radial location, tight fits are necessary
In addition to supporting the rings adequately, the bearings must also be securely located in a radial direction, to prevent creep of the bearing rings on the mating parts under load ➤ Figure 14. This is generally achieved by means of tight fits between the bearing rings and the mating parts. If the rings are not secured adequately or correctly, this can cause severe damage╳ Loss of essential or required characteristics in equipment, machinery or plant or their component parts. to the bearings and adjacent machine parts. Influencing factors, such as the conditions of rotation, magnitude of the load, internal clearance, temperature conditions, design of the mating parts, mounting and dismounting options etc., must be taken into consideration in the selection of fits.
If shock type loads occur, tight fits (transition fit or interference fit) are required to prevent the rings from coming loose at any point. Clearance, transition or interference fits ➤ Table and ➤ Table .
The following information provided in Technical principles must be taken into consideration in the design of bearing arrangements:
The bearings must also be securely located in an axial direction
As a tight fit alone is not normally sufficient to also locate the bearing rings securely on the shaft or in the housing╳ See Mounting dimenstions bore in an axial direction, this must usually be achieved by means of an additional axial location or retention method. The axial location of the bearing rings must be matched to the type of bearing arrangement. Shaft and housing╳ See Mounting dimenstions shoulders, housing╳ See Mounting dimenstions covers, nuts, spacer rings and retaining rings etc., are fundamentally suitable ➤ Figure 14, ➤ Figure 15, ➤ Figure 16 and ➤ Figure 17.
Spherical roller bearing╳ See Rolling bearing24164‑BE-XL
Felt ring seals
Labyrinths with relubrication facility
End cap
Oil feed ducts
Oil grooves
Flake graphite╳ Solid lubricant with layered grid structure. Suitable for dry running or as active ingredient in oils or greases. Graphite absorbs moisture. Graphite displays its best lubrication characteristics in damp environments. cast iron housing
Axial location – bearings with tapered bore
✎
Location by means of locknut and tab washer
If a bearing with a tapered bore is mounted directly on a tapered shaft journal, the bearing can be axially located with ease using a locknut and tab washer ➤ Figure 15.
Figure 15 Spherical roller bearing╳ See Rolling bearing with tapered bore, mounted directly on the tapered shaft journal
Tapered journal with fixing thread
Locknut
Tab washer
Location of bearings by means of adapter╳ An accessory mounted on another element, for example a lubrication adapter sleeve or withdrawal sleeve
✎
Mounting can be carried out quickly and reliably by means of wrench sets from Schaeffler
The location of spherical roller bearings by means of adapter╳ An accessory mounted on another element, for example a lubrication adapter sleeve or withdrawal sleeve on a smooth or stepped cylindrical shaft is an easy-to-fit and operationally reliable method ➤ section and ➤ Figure 16. It requires no additional means of retention on the shaft. The bearings can be positioned at any point on smooth shafts.Axial load╳ Force acting in the direction of the shaft. carrying capacity of such bearing arrangements ➤ section . Further information on adapter╳ An accessory mounted on another element, for example a lubrication adapter sleeves ➤ link .
✎
Mounting of the adapter╳ An accessory mounted on another element, for example a lubrication adapter sleeve and withdrawal sleeve
While the bearing is being slid onto the adapter╳ An accessory mounted on another element, for example a lubrication adapter sleeve, the withdrawal sleeve is pressed into the tapered bearing bore until the required reduction in radial internal clearance is achieved. The position is fixed by means of a locknut. The inner ring is abutted against a shoulder on the shaft ➤ Figure 16. The required adapter╳ An accessory mounted on another element, for example a lubrication adapter sleeves or withdrawal sleeves must be stated additionally in the order ➤ section and ➤ dimension table.
Figure 16 Location of spherical roller bearings by means of adapter╳ An accessory mounted on another element, for example a lubrication adapter sleeve or withdrawal sleeve
Bearing with adapter╳ An accessory mounted on another element, for example a lubrication adapter sleeve, adapter╳ An accessory mounted on another element, for example a lubrication adapter sleeve nut (shaft nut) and tab washer
Bearing with withdrawal sleeve, locknut and tab washer, abutment of the inner ring against a shaft shoulder
Spherical roller bearing ╳
Spherical roller bearing ╳
Loose central rib
Tab washer
.
Oil feed ducts
Oil grooves
Flake graphite ╳
