Single row FAG angular contact ball bearings

31 Pages·2004·0.52 MB·English

Single row FAG X-life angular contact ball bearings
A Member ofthe
Schaeffler Group
Welcome to the Future!
Unmatched Engineering Excellence.
INA & FAG
Partner Power
X-life – this is the new premium grade A further convincing advantage of X-life is
from INA and FAG, offering you new product characteristics that fulfil your
opportunities for success. Benefit from the specific requirements and offer additional
combined expertise of two rolling bearing benefits: for example, particularly
manufacturers with a worldwide low-noise, maintenance-friendly or high
reputation – in every area of application load capacity system solutions.
covering automotive, machine building
and precision engineering.
INA and FAG have brought together their Your X-life advantages at a glance:
strengths to give a new dimension in
quality: • product characteristics far above the
norm
X-life. • lasting quality assurance and control
Higher cost-effectiveness. • extremely high reliability
Higher operational security. • even greater security in planning and
systems
What X-life offers: • optimum availability
• smooth-running working processes
X-life offers excellent product quality that • reduced energy consumption
far exceeds previous standards. • the maximum possible cost-
effectiveness
Furthermore, X-life optimises all the • the maximum possible level of service
parameters that are decisive for a and support
problem-free production cycle. This
includes correct fitting and dismantling,
maintenance intervals matched to the
specific application and the selection of Welcome to the Future!
lubricants matched to operating Unmatched Engineering Excellence.
conditions. INA & FAG
A Member of the
Schaeffler Group
Single row FAG angular contact ball bearings
Expanded application · Advantages
Expanded application In addition to bearingswith the machinery, gearboxes, metal-
cost-effective polyamide cage and working machinery, machinery
High speedsand high axialloads bearingswith the high-grade solid for the food processing sector
are typicaloperating conditionsin brasscage, we now also offer • Standardised machine element
which single row angular contact angular contactballbearingswith (DIN 628-1)
ballbearingsare used. In the case a versatile sheetsteelcage. • Suitabilityfor high axialforces
ofapplication in pumpsand • Suitabilityfor high speeds
compressors, there are frequently • Universaldesignsfor versatile
additionalrequirementssuch as Advantages of fitting in pairs
high temperature resistance and single row angular contact • Bearing designsfor special
low maintenance. In order to fulfil ball bearings requirements, e.g.
these demandsreliablyand for increased operating
economically, FAG isexpanding its • Higher performance bearing temperatures: metalcages
range ofsingle row angular contact arrangements: (see section “Operating
ballbearings. X-lifegrade for significantly temperature range”),
The range now includesbearings longer operating life for increased running accuracy,
with a versatile sheetsteelcage, (see page 2) high speedand smooth running:
see section “Cages”, aswellas • Lower operating costs: bearingsin tolerance classP5
sealed bearings. Improved bearing kinematicsand (see section “Tolerances”),
Due to improvementsin bearing higher racewayqualitygive for high load carrying capacity
kinematicsand refined manufacturing reduced friction, lower bearing and high rigidity: preloaded pairs
processes, the new angular contact temperaturesand lower lubricant ofuniversalbearings(see section
ballbearingsare now classified as requirement. “Preloading ofbearings”)
X-lifeproducts. Thismeansa • Proven in manyapplications • New, sealed bearings
significantlyimproved price/ e.g. in electricalmachinery, for maintenance-free, easy-to-fit,
performance ratio. pumpsand compressors, ventilation cost-effective bearing arrange-
plants, textile machinery, printing ments(available byagreement)
Proven designsofsingle row angular contactballbearingswith a 40°contactangle; New bearing design with sheetsteelcage
left: with polyamide cage, right: with brasscage
1
Single row FAG angular contact ball bearings
Operating life
Operating life Calculation ofthe In order to take accountofrequisite
expanded adjusted rating life reliabilitiesbetween 90 and 99 %,
Long operating life and high the factor a isused, see the
1
reliabilityare the primary The calculation method described following table.
requirements, especiallyin the in ISO 281 Appendix1:2003-4 for
mostfrequentapplication ofsingle determining the expanded adjusted
row angular contactballbearingsin rating life wasderived from the Factor a1
pumpsand compressors. In this methodsused byseveralrolling
Requisite
case, high loadsoccur together bearing manufacturers. relia- 90 95 96 97 98 99
with high speeds. The lubrication bility%
conditionsare often unfavourable The expanded adjusted rating life Factor a 1 0.62 0.53 0.44 0.33 0.21
1
and contamination can impair isdetermined from
operating life.
X-life angular contactballbearings L = a ~a ~L[106revolutions]
nm 1 DIN
are matched to these conditions. and Life adjustmentfactor a
DIN
Theyoffer high load carrying L = a ~a ~L [h]
hnm 1 DIN h
capacityand are especiallysuitable The standardised calculation
for high speeds, since theygenerate where method for determining a takes
DIN
little heatand place onlylow a Adjustmentfactor for requisite accountofthe following influences:
1
demandson lubrication. In the reliability • the bearing load
sealed designs, the high cleanliness a Adjustmentfactor for operating • the lubrication condition (type
DIN
ofthe rolling contactsismaintained conditions and viscosityofthe lubricant,
– a precondition for a long bearing L Basicrating life additives, speed, bearing size)
life. [106revolutions] • the fatigue limitofthe material
L Basicrating life [h] • the type ofbearing
h
• the environmentalconditions
Expanded adjusted rating life Ifthe influenceschange during the (contamination ofthe lubricant)
operating period, the L value
hnm
Since the basicrating life in and the resultanttotalrating life a = f(e ~C /P, κ)
DIN C u
accordance with ISO 281 onlyrarely mustbe determined for each period
indicatesthe actuallyachievable during which conditionsare
running time, a method for constant.
determining the expanded adjusted t Operating temperature
rating life wasdeveloped in νν40 NOopmeriantainl gv isvcisocsoitsyity
Appendix1 ofISO 281. Thistakes Factor a1for requisite reliability n Operating speed
accountofsignificantinfluenceson dνm MReefaenre dnicaem veitsecrosity
the life, namely Rolling bearing failuresasa result κ1 Viscosity ratio
P Equivalent dynamic load
offatigue are subjectto statistical
e Contamination factor
C
• the separation ofsurfacesbythe laws; the requisite reliabilitymust Cu Fatigue limit load
lubricantfilm, therefore be taken into consideration t n
• the influencesofagents when calculating the fatigue limit ν40 dm
(additives) in the lubricant, life. Normally, calculation iscarried ν ν
1
• cleanlinessin the lubrication gap, outon the basisof90 % requisite
• the levelofbearing load, reliability(corresponding to 10 % P C e κ = ν / ν
u C 1
• the type ofbearing. failure probability). The L life is
10
the basicrating life. a
DIN
System for determining a
DIN
2
Single row FAG angular contact ball bearings
Operating life
Viscosityratio κ
1 000 120
The viscosityratio κindicatesthe 500 52 111000 Viscoast it4y0 [ m°Cm2/s]
TdddqκνtvκoTehhipeiuisoi=amaeetseacfgme rplνotrortriahee/ahetmsptyνfetmireieetiean1 o nyrr rlrtguaafuee uνd sttdnlbsr1iiumie:c npronfbi er=ge acgbor ea nvivem(tcdnidDhitsas tw e tncnct+ha hoe.otm etdesesf eoii)n ilrtl/teap myeyt2fnefhtν νe rafehb1aorno aeeitvrsdfinmnains adrctagcinhento eigosoiinlty.is 2mmνReference viscosity 1s2151200300500010 10052 000 0200001 00005 00 002005 000010 0050010002n [0m0i-n1120]00050 2050100 1 000 °Operating temperature t [C] 6975421380000000004 6 810 2 100153202342046681601005202302410660108010005000200300
derived from the V-T diagram using Mean bearing diameter d =D+d[mm] Operating viscosity ν mm2
m 2 s
the operating temperature tand
the (nominal) viscosityofthe oil Reference viscosityν V-T diagram for mineraloils
1
at+40 °C.
For greases, νistaken asthe gap isdependenton Other typesofcontamination, for
operating viscosityofthe base oil. • the type, size, quantityand example bywater or other liquids,
For recommendationson oil hardnessofthe particles cannotbe taken into consideration
viscosityand oilselection, see • the lubricantfilm thickness in thisway.
Catalogue WL41 520. (viscosityratio κ) Ifsevere contamination ispresent
In the case ofbearingsunder high • the bearing size (e →0), failure due to wear must
C
loadswith large proportionalsliding be expected; the operating life of
areas, the temperature in the The stated valuesare valid for the bearing isthen far lessthan the
contactarea ofthe rolling elements contamination bysolid particles. calculated rating life.
can be up to 20 Khigher than that
ofthe temperature measured on Contamination factor eC
the stationaryring (excluding the
Degree ofcontamination Factor e
C
influence ofexternalheatsources). d <100 mm d ≥100 mm
m m
Extreme cleanliness 1 1
Particle size within lubricantfilm thickness
Contamination factor e Laboratoryconditions
C
High cleanliness 0.8 to 0.6 0.9 to 0.8
Veryfine filter in oilfeed
Ifthe lubricantiscontaminated Sealed, greased bearings
with particles, permanent Normalcleanliness 0.6 to 0.5 0.8 to 0.6
indentationsmaybe caused in the Fine filter in oilfeed
Greased bearingswith sealing shields
racewaysbyoverrolling ofthese
Slightcontamination 0.5 to 0.3 0.6 to 0.4
particles. Localincreasesin stress Slightcontamination in oilfeed
occur atthese indentationswhich Typicalcontamination 0.3 to 0.1 0.4 to 0.2
reduce the life ofthe rolling bearing. Bearing contaminated with abraded materialfrom other machine elements
Thisistaken into consideration by Heavycontamination 0.1 to 0 0.1 to 0
Heavilycontaminated bearing environment
the contamination factor e . Guide Inadequate sealing ofbearing arrangement
C
valuesfor e : see the following table. Veryheavycontamination 0 0
C
The reduction in the life asa result
ofsolid particlesin the lubrication dmMean bearing diameter; dm= (D + d)/2
3
Single row FAG angular contact ball bearings
Operating life
Fatigue limitload C Valuesfor the fatigue limitload are effectivenessofthe additivesmust
u
given in the dimension tablesfor be demonstrated under these
In accordance with ISO 281/A2, the each X-life angular contactball contamination conditions. Evidence
life adjustmentfactor a isstated bearing. ofthe effectivenessofthe EP
xyz
asa function ofthe ratio between additivescan be obtained in the
the fatigue limitofthe raceway actualapplication or bymeansof
materialσ and the fatigue-relevant Taking accountofEP additives a rolling bearing testrig FE8 to
u
stressσ. DIN 51819-1.
The fatigue-relevantstressin the Ata viscosityratio κ<1 and a Ifthe EP additivesare proven to be
racewayisdependentprincipally contamination factor e ≥0.2, the effective and the value κ= 1 is
C
on the internalload distribution in value κ= 1 can be assumed when assumed, the life adjustmentfactor
the bearing and the stresscurve in using lubricantswith proven mustbe restricted to a ≤3. Ifthe
DIN
the rolling contactunder the effective EP additives. Ifheavy calculated value a (κ) for the
DIN
heaviestload. Under idealcontact contamination ispresent actualκislarger than 3, thisvalue
conditions, the fatigue limitof (contamination factor e <0.2), the can be assumed.
C
conventionalrolling bearing steels
isreached ata Hertzian pressure of
approx. 2200 N/mm2.
In order to aid practicalcalculation,
the fatigue limitload C hasbeen
u
introduced. The calculation ofC in
u κ = 4 2 1 0.8 0.6 0.5
ISO 281 Appendix1 isbased on a 50
contactpressure of1500 N/mm2. a
DIN
On the same basisasthe basic
staticload rating C in accordance 20 0.4
0
with ISO 76, C isdefined asthe
u
load under which the fatigue limit 10
ofthe bearing materialisreached 0.3
atthe contactunder the heaviest 5
load. A good approximation ofthe
ratio σ /σcan therefore be deter- %
mined uasa function ofC /P. 2 50
u
When determining C , the following 0.2
u
mustbe taken into consideration: 1
• the type, size and internal
geometryofthe bearing 0.5 0.15
• the profiling ofthe rolling elements
and raceways
0.2
• the qualityofmanufacture
• the fatigue limitofthe material
0.1 0.1
30 %
Due to the higher profile accuracy
ofthe racewaysand the better surface
0.005 0.01 0.02 0.05 0.1 0.2 0.5 1 2 5
qualityofthe X-life angular contact
e · C
ballbearings, C can be increased C u
u P
bymore than 30 %. Thisleadsto an
increase ofup to 50 % in the life, Life adjustmentfactor a for X-life angular contactballbearings
DIN
asshown in the diagram for a . Ifκ>4, assume κ= 4. Notto be used for κ<0.1
DIN
4
Single row FAG angular contact ball bearings
Load carrying capacity· Minimum load · Basicload ratingsfor matched bearings·
Equivalentdynamicand staticload · Axialforce for single bearing
Load carrying capacity The lubricantfilm atthe contact Equivalent dynamic load
pointsisbroken and the rolling
In single row angular contactball surfacescome into contactata Single bearing:
bearings, the racewaysare arranged high relative speed. The functional P = F for F /F ≤1.14
r a r
such thatthe forcesare transmitted surfacesmaybe damaged by P = 0.35 F + 0.57 F for F /F >1.14
r a a r
from one racewayto another ata smearing or micropitting. We
certain contactangle. Due to their recommend thatangular contact Bearing pair in O or Xarrangement:
large contactangle of40°, bearings ballbearingsshould be subjected to P = F + 0.55 F for F /F ≤1.14
r a a r
ofseries70B, 72B and 73B are atleast1 % oftheir basicdynamic P = 0.57 F + 0.93 F for F /F >1.14
r a a r
suitable for high axialforces. The load rating C.
bearingscan onlytransmitradial
forcesiftheyare subjected to axial Basic dynamic load rating Equivalent static load
load atthe same time. Normally, C for matched bearings
a bearing isadjusted againsta Single bearing:
second angular contactballbearing Group ofi angular contactball P = F for F /F ≤1.9
0 r a r
in a mirror image arrangement. bearingsofidenticalsize and P = 0.5 F + 0.26 F for F /F >1.9
0 r a a r
design:
Bearing pair in O or Xarrangement:
Minimum load C= i0,7~C [kN] P = F + 0.52 F
Single bearing 0 r a
Ifinsufficientloading ispresent, Basic static load rating C
0
slippage can occur in the bearing. for two matched bearings
The overriding criticalfactor is
slippage collapse. C = 2 ~C [kN]
0 0Single bearing
Determining the axial A B B A
force for the single bearing
Due to the inclined raceways, a
radialload generatesaxialreaction Ka Ka
forcesin angular contactball
bearingsthatmustbe taken into FrA FrB FrB FrA
Load conditions Axialforce F to be used in calculation
consideration when determining a
ofthe equivalentdynamicload
the equivalentload. The axialforce Bearing A Bearing B
iscalculated using the formulae in
F F F
the following table. The bearing YrA ≤ YrB Fa= Ka+ 0.5 ~ YrB –
A B B
supporting the externalaxialforce
Ka– independentofthe axial FrA > FrB F
rbeeaacrtiinogn “ fAo”rc wehsi–le i sthdee ostighnear tbeeda arisng YA YB (cid:2) (cid:3) Fa= Ka+ 0.5 ~ YrBB –
F F
isdesignated asbearing “B”. Ka>0.5 ~ YrA – YrB
A B
For bearingsofseries70B, 72B and
73B, the value Y= 0.57 isused in FrA > FrB
F
tIfhneo f oformrmuulalae.e are given, the YA YB (cid:2) (cid:3) – Fa= 0.5 ~ YrAA – Ka
F F
axialforce Faisnottaken into Ka≤0.5 ~ YrA – YrB
A B
consideration in calculation.
5
Single row FAG angular contact ball bearings
Cages
Cages
Angular contactballbearingsup to Asstandard, bearingswith a bore Advantagesofthe sheetsteelcage:
130 mm bore diameter have as code of24 or higher have a
standard a solid window cage made high-qualitysolid window cage • Insensitive to syntheticlubricant
from glassfibre-reinforced made from brass(suffixMP). • Continuoustemperature up to
polyamide 66 (suffixTVP). This 200 °C
economicalcage isalso used for The range issupplemented bya (for D ≤240 mm, in conjunction
sealed angular contactball universallyapplicable window cage with heattreatmentto S1)
bearings. made from sheetsteel(JP). • Longer grease operating life
Featuresand availabilityofcagesfor single row FAG angular contactballbearings
Designation Design Suffix Speed parameter Features Availability
Open bearing, 70B 72B 73B
oillubrication
n ~d [min–1~mm] Bore code
m
Polyamide Solid window TVP <550 000 Low mass, 04 to 08 00 to 20, 01 to 20,
cage cage, rolling more 22 to 26 22 to 26
element favourable
guided price,
low noise
Sheet steel Window cage, JP <550 000 Insensitive 00 to 20, 01 to 20
cage rolling to synthetic 22 22
element oils, large
guided space for
lubricant,
low mass,
universal
cage
Brass Solid window MP <900 000 Good speed 00 to 30 01 to 26
cage cage, rolling suitability,
element high
guided strength
6
Single row FAG angular contact ball bearings
Suitabilityfor high speeds· Operating temperature range
Suitability for high speeds
The limiting speedstakesinto
100
consideration the mechanicallimits
such asthe strength ofthe bearing 90
%
parts, the churning friction ofthe 80
grease or the permissible sliding 70
speed ofcontactseals. Grease-
60
filled, sealed angular contactball
50
bearingshave a lower speed
40
suitabilitythan comparable open
30
bearings.
20
10
Speed suitabilityofbearing pairs 0
Open, oil 2RSD, grease 2RS, grease
The permissible operating speed
for bearing pairsofuniversal
designsUA and UO in X, O and Limiting speedsfor variousdesignsofangular contactballbearings
tandem arrangementsisabout
20 % below the permissible value
for the single bearing. Thisisin Operating temperature range for angular contactballbearings
order to preventinternaldistortion
Open angular Open angular Sealed angular
ofbearing pairsasa resultofthe
contactball contactball contactballbearings
unfavourable thermalbalance.
bearingswith bearingswith with polyamide
sheetsteelcage polyamide cage cage and seal
or brasscage (RSD or RS)
Operating temperature
+ standard grease
range
Permissible continuoustemperatures
Angular contactballbearingsare
heattreated such thattheycan be
Lower Dependenton –40 °C –30 °C
used up to an operating temperature
limitrange lubricant (–40 °Cfor short
of+150 °C. Bearingsover 240 mm
periods)
outside diameter are dimensionally
stable up to +200 °C. In the case of
bearingswith plasticcagesand
Upper +150 °C +120 °C +80 °C
sealed bearings, attention mustbe
limitrange (D ≤240 mm) dependenton (+120 °C
paid to the operating temperature
+200 °C lubricant dependenton
limitofthe cage or sealmaterial
(D >240 mm) lubricant)
respectively.
7
Single row FAG angular contact ball bearings
Tolerances· Universaldesign · Preloading · Matched bearing sets·
Tolerancesofuniversaldesign and matched bearings· Angular adjustmentfacility
Tolerances Advantagesofpreloaded bearings: Exceptions: Bore tolerancesfor
• Higher bearing rigidity bearingsto tolerance classesPN
FAG angular contactballbearings • Lower running noise and P5 uniformlyto P5 (no special
are generallymanufactured to • More precise guidance suffix). The ring width tolerance for
normaltolerance PN. Byagreement, • Reliable minimum load universalbearingsand matched
we also supplybearingswith bearingsisgiven in the following
increased accuracyto tolerance table.
classP5. Matched bearing sets
FAG suppliesmatched bearing sets Angular adjustment facility
Universal design in accordance with specification
N10 byagreement. The angular adjustmentfacilityof
Single row angular contactball When ordering, the number of single row angular contactball
bearingsofuniversaldesign are bearing setsmustbe stated, not bearingsisdependenton several
suitable for mounting in pairsin the number ofsingle bearings. factors(e.g. load, speed, direction
an X, O or tandem arrangement. oftilting, cage type, bearing size,
These bearingscan be fitted in bearing arrangement, accuracyof
anyarrangementrequired. Tolerances of the bearing seatsetc.) and influences
Sealed single row angular contact universal design and the bearing performance (e.g.
ballbearingsofuniversaldesign matched bearings rigidity, load carrying capacityetc.)
are suitable for fitting in an Xor O in variouswaysso itisnotpossible
arrangement. For tandem arrange- Angular contactballbearingsof to make a generallyvalid statement.
ments, please consultFAG. universaldesign UO or UA are A guide value for the possible
The following distinction isto be supplied to normaltolerance PN skewing ofsingle bearingscan be
made in Xor O arrangements: (no suffixfor tolerance) and by taken asapprox. 2 angular minutes.
UA Slightaxialinternalclearance agreementwith increased accuracy
UO Clearance-free to tolerance classP5. For angular
UL Slightpreload contactballbearingsofuniversal
Valuesfor axialinternalclearance design, the tolerancesfor normal
and preload:see table on page 9. radialbearingsapply.
Tandem arrangementO arrangement Xarrangement
Ring width tolerance for universalbearingsand matched bearings
Dimensionsin mm
Nominaldimension over 50 80 120 180
for bearing bore incl. 50 80 120 150 315
Width deviation ∆ [µm]
Bs
Tolerance class PN 0 0 0 0 0
–250 –380 –380 –500 –500
Preloading of bearings
Through lateralsizing ofthe single
P5 0 0 0 0 0
bearings, the axialclearance or
–250 –250 –380 –380 –500
preload ofthe bearing pair can be
adjusted to the required value.
8