2..-K-CA-W33

Technical characteristics

Spherical roller bearings are non separable do- uble row radial bearings.

Both rows of barrel shaped rollers rotate,in pa- rallel,within the spherical outer ring.This allows an  excellent  alignment  compensation,caused by machining and mounting errors,between the shaft and housing.

Their boundary dimensions ara standardized by de DIN Standard 616 and DIN 635/parte2.

Spherical roller bearings are typical bearings for heavy machinery and mining.

They are suitable for applications with large ra- dial loads or where larger misalignments may occur.They are also able to support minor axial forces in both directions.

Due to their kinematic behaviours,spherical ro- ller bearings are only suitable for operating at low to medium speeds.

VEO spherical roller bearings are produced in open design as standard.

They are frequently used with tapered bores (ta- per 1:12)namely suffix K exceptfor series 240, 241,248 and 249 where the taper bore (1:30)is namely suffix K30,for ease of mounting.

The facility of mounting these bearing types using adapter and extraction sleeves enables mounting directly onto drawn or fine turned seats of shaft for applications where high running

accuracy is not necessary.

For some applications it remains necessary to mount tapered bore bearings directly onto a ta- pered seat of the shaft.

 

Standard design variants

VEO spherical roller bearings are produced in se- veral designs,depending on bearing series and size.The main differences are in the design of the inner ring and/or cages.

 

Cages

There are five different models of cages with different  characteristics  according  to  material and shape depending on the application where the bearing is in use.These designs are described

below:

CC.:two window-type  steel  cages,flange- less inner ring and guide ring centred on the inner ring

CA.:one  piece  solid  brass  cage,retaining flanges on the inner ring,centred on the inner ring

CAF.:as CA,but with a steel cage

MA.:two pieces solid brass cage,outer ring guided

MB.:twopiecessolid  brass  cage,inner  ring guided

For the availability of Spherical roller bearings with other cages,please contact VEO

 

Spherical roller bearings for shaker screens

Bearings in these applications are subjected to very severe operating conditions.The shaking ac- tion of the screen subjects the bearings to very heavy  loads  including  impact  loads.Additional

loading on the bearing is created by the higher “g”forces generated by higher acceleration pre- sent in the application.Heavy loads result in hig- her shaft and housing deflections.

This requires the bearing to accommodate the re- sulting misalignment.

Bearings are also subjected to higher speeds and contaminated  environments.

VEO has designed a special line of spherical roller bearings to operate under very severe operating conditions present in vibrating screen applica- tions.

Special features in VEO bearings,are described below:

Optimized internal design to reduce the rota- ting torque.

Outer ring guided machined brass cage (MA)is used for impact resistance

Radial internalclearance C4 and restricted dia- meter tolerances

Special VEO spherical roller bearings for vibrating screen applications are available

In the 22300 series these bearings are identified with the suffix CE12.

 

Sealed spherical roller bearings

The selection of VEO spherical roller bearings is also produced in a sealed version with contact seals on both sides.The seals are reinforced with sheet steel and made of an oil and wear-resistant

material:

acrylonitrile-butadiene rubber(NBR):suffix ORN

hydrogenated  acrylonitrile  butadiene  rubber (HNBR):suffix ORH

fluoro rubber (FKM):suffix ORF

The  internal  design  of  a  sealed   bearing  corres- ponds  to  that  of  an  open  bearing.The  external dimensions are also the same except for bearings based  on the  222  and  223  

series.These  bearings are slightly wider and carry the series designation LB-22 and  LB-23  respectively.

 

Lubrication

VEO spherical  roller bearings are  produced  incor- porating   simple   re-lubrication   features   as   stan- dard.(e.g.a   circumferential   groove   and   lubrica- ting  holes  in  the  outer  ring).

These   features   are   identified   with   the   suffix W33.

 

Internal radial clearance

For  the  internal  clearance  group  of  spherical  ro- ller  bearings  a  distinction  must  be  made  between bearings  with   cylindrical  or  tapered   bores.

Because  of  the   risk  of  applying   accidental   pre-  oading  to  the   bearing  during   mounting,bearings with  tapered  bores  feature  larger  values  of  clea- rance  compared  to  cylindrical

bore  bearings  even in  the  same  clearance  group.

VEO  spherical   roller   bearings   are   produced   to each   relevant   normal   clearance   group   CN(as standard).

VEO  also  produce  spherical  roller  bearings  with enlarged  (radial  clearance  groups  C3,C4  or C5)or even  reduced  radial  clearance  (clearance  group C2)on  order  request.

The Values of clearance groups for VEO spherical roller  bearings  are  given  in  the  tables   listed  on the  tables  on  the  following  pages.

These    valuesconform,where     standardised,toDIN 620/part  4  and   ISO  5753-1981   respectively.

 

Radial internal clearance of VEO spherical roller bearings,bore diameter

Clearance group	Bore diameter(mm)
	>	-	24	30	40	50	65	80	100	120	140	160	180	200	225
	≤	24	30	40	50	65	80	100	120	140	160	180	200	225	250
C2	min	10	15	15	20	20	30	35	40	50	60	65	70	80	90
	max	20	25	30	35	40	50	60	75	95	110	120	130	140	150
CN	min	20	25	30	35	40	50	60	75	95	110	120	130	140	150
	max	35	40	45	55	65	80	100	120	145	170	180	200	220	240
C3	min	35	40	45	55	65	80	100	120	145	170	180	200	220	240
	max	45	55	60	75	90	110	135	160	190	220	240	260	290	320
C4	min	45	55	60	75	90	110	135	160	190	220	240	260	290	320
	max	60	75	80	100	120	145	180	210	240	280	310	340	380	420
C5	min	60	75	80	100	120	145	180	210	240	280	310	340	380	420
	max	75	95	105	130	160	185	230	260	300	350	390	430	470	520

 

Clearance group	Bore diameter(mm)
	>	250	280	315	355	400	450	|500	560	630	710	800	900	1.000	1.120
	≤	280	315	355	400	450	500	560	630	710	800	900	1.000	1.120	1.250
C2	min	100	110	120	130	140	140	150	170	190	210	230	260	290	320
	max	170	190	200	220	240	260	280	310	350	390	430	480	530	580
CN	min	170	190	200	220	240	260	280	310	350	390	430	480	530	580
	max	260	:280	310	340	370	410	440	480	530	580	650	710	770	840
C3	min	260	280	310	340	370	410	440	480	530	580	650	710	770	840
	max	350	370	410	450	500	550	600	650	700	770	860	930	1.050	1.140
C4	min	350	370	410	450	500	550	600	650	700	770	860	930	.050	1.140
	max	460	500	550	600	660	720	780	850	920	1.010	1.120	1.220	1.430	1.560
C5	min	460	500	550	600	660	720	780	850	920	1.010	1.120	1.220	1.430	1.560
	max	570	630	690	760	840	910	980	170	1.160	1.270	1.410	1.540	1.820	1.990

 

Radial internal clearance of VEOspherical roller bearings with tapered bore

Clearance group	Bore diameter(mm)
	>	-	24	30	40	50	65	80	00	120	140	160	180	200	225
	≤	24	30	40	50	65	80	100	120	140	160	180	200	225	250
C2	min	15	20	25	30	40	50	55	65	80	90	100	110	120	140
	max	25	30	35	45	55	70	80	100	120	130	140	160	180	200
CN	min	25	30	35	45	55	70	80	100	120	130	140	160	180	200
	max	35	40	50	60	75	95	110	135	160	180	200	220	250	270
C3	min	35	40	50	60	75	95	110	135	160	180	200	220	250	270
	max	45	55	65	80	95	120	140	170	200	230	260	290	320	350
C4	min	45	55	65	80	95	120	140	170	200	230	260	290	320	350
	max	60	75	85	100	120	150	180	220	260	300	340	370	410	450
C5	min	60	75	85	100	120	150	180	220	260	300	340	370	410	450
	max	75	95	105	130	160	200	230	280	330	380	430	470	520	570

 

Clearance group	Bore diameter(mm)
	>	250	280	315	355	400	450	500	560	630	710	800	900	1.000	1.120
	≤	280	315	355	400	450	500	560	630	710	800	900	1.000	1.120	1.250
C2	min	150	170	190	210	230	260	290	320	350	390	440	490	540	600
	max	220	240	270	300	330	370	410	460	510	570	640	710	780	860
CN	min	220	240	270	300	330	370	410	460	510	570	640	710	780	860
	max	300	330	360	400	440	490	540	600	670	750	840	930	1.020	1.120
C3	min	300	330	360	400	440	490	540	600	670	750	840	930	.020	1.120
	max	390	430	470	520	570	630	680	760	850	960	1.070	1.190	1.300	1.420
C4	min	390	430	470	520	570	630	680	760	850	960	1.070	1.190	1.300	1.420
	max	490	540	590	650	720	790	870	980	1.090	1.220	1.370	1.520	1.650	1.800
C5	min	490	540	590	650	720	790	870	980	1.090	1.220	1.370	1 1.520	1.650	1.800
	max	620	680	740	820	910	1.000	1.100	1.230	1.360	1.500	1.690	1.860	2.030	2.220

 

Tolerances

VEO Spherical roller bearings are produced to nor- mal tolerance class (PN)as standard.

The value of a single tolerance level is listed in the form of the "Bearing Data/Tolerance" chapter.

 

Misalignment

Spherical roller bearings are optimum to compen- sate misalignments.

The maximum permissible misalignment from their   centre   position(ψ),is   dependant   upon bearingdesign,series and actual operating con- ditions.

 

Bearings series	Maximum permissible misalignment
	ψ ≤[°]
213	1
222	1,5
223	2,0
230	1,5
231	1,5 2.0
232	2,5
239	1,5
240	2,0
241	2,5

 

Minimum  load

To perform effectively,spherical roller bearings should carry a minimum bearing load of approxi- mately ca.2 percent of the dynamic load rating C.

 

Equivalent  dynamic  bearing  load

|f   ,then:P=F,+Y·F

or if ,when then:P=0,67-F,+Y-F

Values of Y and e are stated in the product tables.

 

Equivalent  static  bearing  load

For spherical roller bearings:

P₀=F,+Y。·F

Values of Y,are stated in the product tables.

 

Abutment  and  fillet  dimensions

The shoulders on adjacent machine parts must be designed in such a way that the required thrust support of the bearing rings is guaranteed.

The bearing rings must contact adjacent parts with their side faces only.

The bearing chamfers must not contact the  shoulder fillet radii of shaft or housing shoulders.

Therefore,the largest fillet radius(rg)must be kept smaller than the minimum chamfer on the bearing rings(rs)given in the product tables.

Recommendations for the dimensions of adjacent parts are given in DIN 5418.

rs Minimum	rg Maximum	h
		Bearing Series
		230,239, 240	213,231,223 241,222,233, 232
1	1	2,3	2,8
1,1	1	3	3,5
1,5	1,5	3,5	4,5
2	2	4,4	5,5
2,1	2,1	5,1	6
3	2,5	6,2	7
4	3	73	8,5
5	4	9	10
6	5	11,5	13
7,5	6	14	16
9,5	8	17	20

 

Spherical  roller  bearings  mounted  on adapter  or  withdrawal  sleeves

For applications where spherical roller bearings and adapter sleeves are mounted on straight shafts without additional axial support,(Fig.3a), their ability to accept axial forces is limited by the

friction between the adapter sleeve and the shaft.

The permissible thrust load may be estimated using the following formula :

Famax≤3·d-B

where: Famax=maximum permissible thrust load for sphe- rical roller bearings mounted onadapterslee- ves [N]

B=bearing width  [mm]

d=bearing  borediameter  [mm]

With higher axial  forces,the bearing must be  se- cured additionally  by  supporting  rings as  shown in  Fig.3b.

When designing such  supporting  rings,however, specific  dimensions  have  to  be  obtained  (tables  5 and   6,next   page)

Adapter  sleeves: In  additionto these  standard sleeves  which are designated H and shown in the product  tables,VEO produces  sleeves  to  other designs  which   differ  in  the number  and

arrange  ment  of  the  oil  ducts  and  distributor  grooves,if it  is  needed  extra  information  or  in  case  of  do- ubt,consult   with  the  department  of  engineering applications  VEO.

Extraction sleeves: To  enable the  oil  injection  method  to  be  used  for  mounting  and  dismounting,  VEO  extraction  sleeves  with   bore  diameters  of  200 mm  and  above  are

produced  as  standard  with oil  supply  ducts  and  distributor  grooves,which  are  designated   AOH.

These  AOH  sleeves  have  two  oil  supply  ducts  at the   threaded   side   as   well   as   oil   distributor   gro-  oves   in  the   circumferential  and  axial  directions, both  in  the  outside

surface  and  the  sleeve  bore.

 

Bearing housings

Spherical roller bearings with either cylindrical or tapered bores are frequently used in conjunction with bearing housings as complete ready to mount assemblies.

VEO also produce bearing housings for spherical roller bearings.

 

Mounting  instructions

Particularly when mounting spherical roller bea-rings with tapered bores special care must be taken to retain a minimum residual internal bea-ring clearance after mounting.

Please request the detailed information in the dossier Handling,Mounting and Dismounting Ro-lling Bearings in case of doubt,consult with the department of engineering applications VEO.

 

Supplementary designations

The product tables show the standardized bea- ring configurations updated on the edition of this catalogue.These standardized configurations co- rrespond to suffix or suffixes of each bearing.

In any case,VEO can offer,under requirement, alternative designs,comprising the ones showed in  the  following  table  or  many  others,whose mention exceeds the purpose of the present ca-

talogue,and can be found in specific technical  publications of concrete applications or series of specific bearings.

Should you need a special design not existent in these pages,please contact our Sales Department in VEO Bearings Europe.