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RTR
Bearing
RTR Bearing
Content
Slewing bearing
1 Concept of slewing bearing.......................................................................................... 1
2 Function & characteristic of slewing bearing..........................................................1
3 Choosing type ...................................................................................................................2
4 Slewing bearings materials & technique required .................................................3
5 Clearance of slewing bearings......................................................................................5
6 Lubrication & seal of slewing bearings ......................................................................6
7 Operating temperatures..................................................................................................7
8 Service life ..........................................................................................................................8
9 Inspection to rings ...........................................................................................................8
10 Package & storage of slewing bearings...................................................................8
11 Installation & maintenance of slewing bearings....................................................8
12 Dimension form ............................................................................................................11
13 Load curve chart...........................................................................................................26
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RTR Bearing
www.rtr-slewing.com
Slewing bearingDalian Running Engineering Company Limited (with registered brand RTR) is a professional
manufacturer and exporter of kinds of slewing bearings and other bearings. From opened
in 1998, we always supply excellent product and service to every users. Moreover, we have
gained ISO9001 certificate for our control of quality. We specialized in slewing bearings and
other medium and large size bearing. Product range is from 50mm to 5000mm. We are very
professional in controlling the quality of our product. Since we have very strong ability both in
design and technical analysis, we can provide our customers with exact, suitable, economic
products also the technical services. Weve built up good relationship with our customers all overthe world, especially in the Europe and USA market. Product is widely used in metallurgy, mining,
petroleum exploitation, light industry, aviation, harbor/quay, vessels, military industry, instruments
and meters etc.
Our goal is to supply the customer with high quality, suitable products and professional,
prompt service to ensure your machines keep running!
RTR bearing with Reasonable price, Timely delivery, Responsible quality.
RTRKEEP RUNNING!
Examples for application Equipment
Areal Hydraulic Platform
Bogie Bearing for Vehical
Excavators
Harbor and Shipyard Cranes
Machine Tools
Mechanical Engineering
Mobile Cranes
Offshore Technology Packaging and Filling Machine
Rail Vehicles
Ship Deck Cranes
Stackers and Reclaimers
Steelmill Equipment
Tower cranes
Tunneling Machines
Water Treatment Equipment
Wind and Solar Energy Plants
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Slewing bearing
1.Concept of slewing bearing
1.1 Slewing bearings defnition, structure, and classifcation
1) Defnition
Slewing bearing is a large bearing with special configuration, which can endure biggish
multiply load, such as axial & radial load, overturning moment, etc.
2) Structure
Slewing bearing is composed of outer ring (teeth or non-teeth), rolling element (steel ball,
cylindrical roller, tapered roller), cage, inner ring (teeth or non-teeth) and seals (the one with
sealed structure).
3) Classifcation
Slewing bearing can be classied by different structure: four point contact ball slewing bearing;
double row different diameter ball slewing bearing; cross roller slewing bearing; three row
roller slewing bearing, etc.
Slewing bearing also can be classified by teeth: slewing bearing with non-teeth, slewing
bearing with external teeth, slewing bearing with internal teeth.
2. Function & characteristic of slewing bearing
2.1 Function
Slewing bearing itself is featured in compact structure, convenient lead to slew, easy for
installation & maintenance, which is widely used as slewing set in the elds of heavy machine,
slewing platform in the steelworks, excavator grab, material taking & stacking set, material
traveler, harbor machine, missile launching cage, CT set, etc.
2.2 Characteristic
1) Four point contact ball slewing bearing can take more dynamic load, and suitable for the
application with speed.
2) Cross roller slewing bearing can take more static load, its pre-interference is better for more
support rigidity and slewing precision.
3) Three row roller slewing bearing is a high load capacity slewing set, different direct
raceway and rollers can take load from different side. So when have the same load, it can be
smaller size that can make the applocation compact.
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3. Choosing typeHow to choose the slewing bearing type to suit the application best?
Most of the companies chooses slewing bearing depends on the load chart.
Most of slewing bearings work under eccentric load, take axial load (Fa), radial load (Fr) and
overturning moment (M). So before choosing a suitable bearing need to have calculation for the
bearing using condition, need to calculate the load for dynamic and static condition. Calculating
the service life according to the safty factor of different application. Then may choose the suitable
bearing.
M (KN-M)
32000
24000
16000
8000
8000 16000 24000 32000
(KN)
8.8
3
1
2
10.9
12.9
0
277/2680K Slewing bearing load curve
Curve 1 means when material is 42CrMo, it is the allowable static load curve for ball bearingwith allowable contact stress 3850Mpa, or roller bearing with allowable contact stress 2700 Mpa.
Curve 2 means rated dynamic load curve when bearing has whole turning with reliability
90%, life time 0.03106, under condition of not high radial load, low speed of turning and not high
working precision.
Curve 3 means when material is 50Mn, it is the allowable static load curve for the ball bearing
with allowable contact stress 3400Mpa, or roller bearing with allowable contact stress 2100Mpa.
The maximum load curve of the bolt is when its joint length is five times long as the bolt
diameter, and the preliminary stress is 10% of the yield strength of the material.
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4. Slewing bearings materials & technique required
4.1 Main materials
1) Rings
1.1) Materials
Steel 45#, 50Mn (carbon structural steel), 42CrMo (alloy structural steel). 50Mn and 42CrMo
are usually used. Their chemical component and mechanics capability are showed in the form1
below.
Form 1
Material
Chemic component % Mechanics Capability
C Si Mn Cr Mo
bTensilestrength
sYield
strength
5
Elongation
Reduction
of area
AKUImpactvalue
Standard
Mpa % J
42CrMo0.38-0.40
0.17-0.37
0.50-0.80
0.90-1.20
0.10-0.25
1080 930 12 45 63 GB/T3077
50Mn0.48-0.56
0.17-0.37
0.70-1.00
- - 645 390 13 40 31 GB/T699
1.2) Hardness
Normalizing hardness of the rings is 187HB-241HB, quench & temper hardness is 229HB-
269HB, hardness of the raceway after quenching is 55HRC-62HRC.
1.3) Depth of harden
After raceway surface quenching, the valid harden depth (DS) should be meet with the
following form 2.
Form 2 Valid raceway harden depth (DS) Unit: mm
Dw(Roller/ball Diameter)Exceed - 30 40 50
To 30 40 50 -
DS 3.0 3.5 4.0 5.0
DS is the harden depth of raceway surface when hardness48HRC.
1.4) Quenching soft belt of the raceway
I Width of soft belt: to the rings without lling hole, when rolling element diameter Dw25mm,
width of soft belt should be less than 2Dw; when Dw25mm,width of soft belt should be less than
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50mm. As to the rings with lling hole, width of soft belt should be less than lling hole diameter
plus 35mm.
II Marking of soft belt: soft belt on the ring with filling hole should be the place of taperpin(lling hole) and don't need to be marked, on other rings should be set to non-installation part
with the visible permanent mark S. As to the soft belt of double half rings, except setting mark,
the two soft belt should be set between 180or in one point.
2) Rolling element
It is made of chrome steel GCr15 or GCr15SiMn.
I Steel ball should accord with the standard of GB/T308-2002,
roller should accord with the standard of GB/4661-2002.
II Rolling element tolerance should be chosen based on slewing bearing tolerance grade,
which should accord with form 3.
Form 3 Tolerance grade of rolling element to choose
Bearing'sTolerance
Grade
Steel Ball
Cylindrical Rollera
DwExceed - 30 50
To 30 50 -
0.6 G40 G60 G100
5 G20 G40 G60
a VLWL can be not required, surface round runout SDW should be in the range of twice
standard.
3) Seal:
It is usually made of NBR, iron, felt, or other things which meet the capability.
Steel number comparison between China & other countries, follow form 4.
Form 4 Slewing bearing material number comparison between China & Other countries
TypeChinaGB
(YB)
USSR
USAAISI SAE
U.KBS
JapanJIS
FranceNF
GermanyDIN
carbonstructural
steel
45 45 1045 S45C C45C45,CK45
50Mn 50C1050,1052
En43C XC48
alloystructural
steel42CrMo 4140 En19A 42CD4 42CrMo4
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Material selection of slewing bearings: mainly based on working condition, size, capability
required.
Material selection of rolling element: GCr15SiMn is selected for larger size rolling element,GCr15 is selected for smaller size rolling element.
Material selection of rings: steel 45# is for those which are low slewing speed, low precision
& capability required. 50mn is for those which are higher precision & capability required, 42CrMo
is for those which are higher precision & capability, higher intensity or larger size required.
5. Clearance of slewing bearingsThe clearance of slewing bearings is mainly used to equalize the manufacture & setting erros,
which is caused by slewing bearings support part and applications assembling part, in order to
ensure the bearings right operation. It is listed in form 5 ~ 8 with with the data of clearance, which
is based on slewing bearings structure, tolerance grade, and rolling elements diameter.
We also can supply slewing bearing with preload, 0 even minus clearance.
Form 5 Axial clearance of four point contact ball slewing bearing m
Dpw
mm
Tolerance Grade
G E D
Axial Clearance
Exceed to Min Max Min Max Min Max
280 450 70 170 50 130 30 90
450 710 100 220 70 170 40 120
710 1120 120 280 100 220 50 150
1120 1800 150 350 100 260 60 180
1800 2800 200 440 150 350 80 240
2800 4500 260 540 200 440 100 300
Form 6 Axial clearance of double row ball slewing bearing
Dpw
mm
Tolerance Grade
G E D
Axial Clearance
Exceed to Min Max Min Max Min Max
280 450 50 130 30 90 25 70
450 710 70 170 40 120 30 90
710 1120 100 220 50 150 40 120
1120 1800 100 260 60 180 40 140
1800 2800 150 350 80 240 60 180
2800 4500 200 440 100 300 80 240
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Form 7 Axial clearance of cross roller slewing bearing
Dpw
mm
Tolerance Grade
G E D
Axial Clearance
Exceed to Min Max Min Max Min Max
280 450 50 130 30 90 25 70
450 710 70 170 40 120 30 90
710 1120 100 220 50 150 40 120
1120 1800 100 260 60 180 40 140
1800 2800 150 350 80 240 60 180
2800 4500 200 440 100 300 80 240
Form 8 Axial clearance of three-row roller slewing bearing
Dpw
mm
Tolerance Grade
G E D
AxialClearance
RadialClearance
AxialClearance
RadialClearance
AxialClearance
RadialClearance
Exceed to Min Max Min Max Min Max Min Max Min Max Min Max
280 450 30 90 50 130 25 70 30 90 10 50 25 70
450 710 40 120 70 170 30 90 40 120 15 65 30 90
710 1120 50 150 100 220 40 120 50 150 20 80 40 120
1120 1800 60 180 100 260 40 140 60 180 20 100 40 140
1800 2800 80 240 150 350 60 180 80 240 30 130 60 180
2800 4500 100 300 200 440 80 240 100 300 40 160 80 240
6 .Lubrication & seal of slewing bearingsIt is necessary measure to lubricate & seal bearings effectively and sufciently for ensuringbearings safety operation and avoiding early abnormal damage.
6.1 Lubrication of bearings
Slewing bearings are usually operating in high-load & low-speed working condition, it is
recommended to ll lubricate grease to do a good job. There are kinds of lubricate grease widely
used, such as calcic lubricate grease, lithium lubricate grease, aluminum lubricate grease, high
temperature lubricate grease, etc. Customer could choose the most suitable lubricate grease
based on actual condition. It is listed with recommended lubricate grease types in form 7.
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6.2 Seal of slewing bearings
The seal of slewing bearings is used for avoid leakage of filled lubricate grease on one
side, and the other side is to avoid inleakage of outer dust, impurity and water which can cause
abnormal operation of slewing bearing. As slewing bearing is operating in the condition of high-
load & low-speed, there are two seal structures ususlly used, rubber and labyrinth. Rubber is
widely used because of simple structure, little space occupied, good seal capability. But it will
aging easily at high temperature and lose seal capability. So it is recommended to use labyrinth
when in the high temperature condition.
Form 9
Support structure& seal form Operating condition
Lubrication Lubrication grease
Part Name Type
Holistic & partialcage or plasticpartition rubber
seal
Low temperature, normaltemperature, wateriness
40+60
Raceway Calcium base greaseZG3ZG4ZG5
GearGraphite & Calcium
base greaseZGS
Muti-genuspartition
Labyrinth seal
Hightemperature,wateriness
40140
Raceway
Lithium base greaseZL1ZL2
MoS2 compoundedCalcium base grease
NO.3
GearNo.4 high temperature
greaseZN6-4
80180
RacewayMoS2 compounded
Calcium base greaseNO.2
GearNo.4 high temperature
greaseZN6-4
Normal temperature,corrosion of sea
water proof
RacewayNo.2 aluminum-base
greaseZU-2
GearNo.2 aluminum-base
greaseZU-2
7. Operating temperaturesStandard RTR Slewing Ring can be used in ambient temperatures from -45 to up +70,
please contact us in the case of higher or lower operating temperatures.
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8. Service lifeThe service life of the slewing bearing depends on the operating conditions. The following
factors are keys:
Torque
Output speed
Duty factor
Ambient temperature
Lubrication etc.
9. Inspection to ringsInner & outer diameter size, height, magnetism remained, thickness of the raceway for ball,
central diameter of the mounting holes, space between holes. For those with outer teeth shouldalso inspect teeth height, constant cord thickness, etc.
10. Package & storage of slewing bearings
10.1 Package of slewing bearings
Every set of slewing bearings before delivering to customers should be packed well, of which
inside, outside surface and raceway are spreaded with antirust & lubricate grease. Inner package
is made of plastic lm, and then compositive kraft, outer package is enlaced with ax pieces.
10.2 Storage of slewing bearing
RTR slewing bearings are well treated with antirust and oil seal before delivery, which can
ensure non-rust in 12 months in the normal storage condition. When slewing bearings are in
antirust period, they can be stored when their original package is in good condition. As to the
storage is in excess of antirust period, slewing bearings should be treated with cleanout and oil
seal again.
Slewing bearings should be placed horizontally in a dry breezy at eld, which are away from
chemical and other erosive things. If slewing bearings are piled up for storage, its necessary to
use at least three stow-wood in equal height, which are equally placed between every slewing
bearing, and their location between up & low level should be consistent.
11 . Installation & Maintenance of slewing bearings
11.1 Installation of slewing bearings
Before installation of every set of RTR slewing bearings, its necessary to check the
host installation plane. Make sure that the support part has enough rigidity, and it should be
mechanically processed in order to remove the sundries and burrs. Technology required to joint
surface of support part should accord with form 10.
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Form 10 Technology required to joint surface of support part
Centralcircle
diameter ofthe hole
D1 or D2mm
Complanatedegree
a
Gradientvariable of unitlength betweencircles(L=1 holedistance)on thesame direction
(s-t)mm
Gradientvariable of unitlength betweencircles(L=1 holedistance)on thereverse direction
(s+t)mm
Gradient ofradial width b
Side faceroughness
Ra
Bearing precision grade
Exceed To G E D G E D G E D G E D G E D
250 400400 630
630 100
1000 16001600 25002500 40004000 6300
120 80 50150 100 60
200 120 80
250 150 100300 200 120400 250 150500 300 200
0.
0002L
0.
00013L
0.
00008L
0.
0002L
0.
00013L
0.
00008L
60 40 2580 50 30
100 60 40
120 80 50150 100 60200 120 80250 150 100
2.5 1.25 0.82.5 12.5 0.8
2.5 12.5 0.8
3.2 2.5 1.253.2 2.5 1.253.2 2.5 1.253.2 2.5 1.25
d
Side faces plane degree of working table
Circle spread
Radial widths inclination degreeof working table side face
Theres a quenching soft belt marks S on the rings surface of every set of RTR slewing
bearings offered to customers. Soft belt should be located in non-loading area or non-regular
loading area (Where filler plugs locate) during installation. Installation should be begun with
slewing bearings radial location, screw down the mounting bolt and check the slewing condition.
In order to ensure the slewing steadiness of bearings, gear mesh checking is needed before
screwing down the bolt completely. It should has enough preload when screwing down the bolt,
which should be 70% of yield strength of bolt material. Mounting bolt should be used with Q & T
at gasket not spring gasket.
The fastening bolt must reach the required preload when assemble the slewing bearing.
Preload of different diameter bolt should accord with form 11.
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Form 11
Bolt rigidity gradeISO0898
8.8 10.9 12.9
Yielding limitN/mm2
M16 640
M>16 640940 1100
Boltdiameter
Forcedstress areaof thread
mm2
Sectionarea ofthreadmm2
Pre-screwingtightness
of boltinstallation
FMN
AcademictightnessmomentMANm
Torsionalmoment
NmM'=0.9MA
Pre-screwingtightness
of boltinstallation
FMN
AcademictightnessmomentMANm
Torsionalmoment
NmM'=0.9MA
Pre-screwingtightness
of boltinstallation
FMN
AcademictightnessmomentMANm
Torsionalmoment
NmM'=0.9MA
M5 14.2 12.7 6400 6.1 5.5 9300 8.9 8.0 10900 10.4 9.3
M6 20.1 17.4 9000 10.4 9.3 13200 15.5 13.9 15400 18 16.2
M8 36.6 32.8 16500 258 22.5 24200 37 33 28500 43 38
M10 58 52.3 26000 51 45 38500 75 67 45000 87 78
M12 84.3 76.2 38500 87 78 56000 120 117 66000 150 135M14 115 105 53000 140 126 77000 205 184 90000 240 216
M16 157 144 72000 215 193 106000 310 279 124000 370 333
M18 193 175 91000 300 270 129000 430 387 151000 510 459
M20 245 225 117000 430 387 166000 620 558 194000 720 648
M22 303 282 116000 580 522 208000 830 747 24300 970 873
M24 353 324 168000 740 666 239000 1060 954 280000 1240 1116
M27 459 427 221000 1100 990 315000 1550 1395 370000 1850 1665
M30 561 519 270000 1500 1350 385000 2100 1890 450000 2500 2250
M33 694 647 235000 480000 560000
M36 817 759 395000 560000 660000
M39 976 913 475000 670000 790000
M42 1120 1045 542000 Thread hydraulictension set needed
to use
772000 Thread hydraulictension set needed to
use
904000 Thread hydraulictension set needed to
useM45 1300 1224 635000 905000 1059000
M48 1470 1377 714000 1018000 1191000
M52 1760 1652 857000 1221000 1429000
M56 2030 1905 989000 1408000 1648000
M60 2360 2227 1156000 1647000 1927000
12.1 Maintenance of slewing bearings
RTR slewing bearings should be checked with mounting bolt preload moment to see whether
its qualified as required after 100 working hours. Since the first check, it should be repeated
every 500 working hours.
After installation, some lubrication grease should be filled into bearings, when doing this,
remember to slew the bearings in order to ensure grease equal arrangement. Its normal for
slewing bearings to lose some lubrication grease after working for some time, so grease relling
is necessary for working slewing bearings once every 50~100 working hours. This period should
be reduced in the working condition of high temperature and dust. This relling is also needed
when machine stops turning for some time.
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12.1
Single-rowf
ourpoin
tcontactballs
lewingring
bearing
Thesingle-row
fourpointcontactballslewingringiscomposedof2seat-rings.I
tfeaturesc
ompactindesign,andlightinweight.The
ballscontactwiththecircularra
ceatfourpoints,v
iawhichtheaxialforce,radialforceandresulta
ntmomentmaybebornsimultaneously.
Itmay
be
used
forslewin
g
conveyers,welding
arm
and
positioner,light,medium
duty
cranes,excavators
and
othereng
ineering
12.
Dimensionform
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:HLJKW
(kg
)
7RRWKOHVV
([W
7RRWKLQJ
,QW
7RRWKL
QJ
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D1
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DL
DL
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mm
mm
mm
mm
mm
m m
mm
mm
mm
mm
mm
mm
mm
DOL]
HUL
mm
mm
mm
LQJ
QJ
Z
T
10
4N
10
4N
1
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_
280
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Bearing
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7/29/2019 Rtr Bearing
19/52
RTR
Bearing
15
RTR Bearing
www.rtr-slewing.com
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-
7/29/2019 Rtr Bearing
20/52
RTR
Bearing
16
RTR Bearing
www.rtr-slewing.com
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7/29/2019 Rtr Bearing
21/52
RTR
Bearing
17
RTR Bearing
www.rtr-slewing.com
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-
7/29/2019 Rtr Bearing
22/52
RTR
Bearing
18
RTR Bearing
www.rtr-slewing.com
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12.3
Double-rowb
alls
lewing
ring
type
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rthan1/10oftheaxailforcethe
racesshouldbenewlydesigne
d.
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aybedirectlyarrangedintothe
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enable
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nofthedouble-rowballslewing
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aringconstructionissturdy,hen
ceitis
especiallysuitablefortowercraneswhichrequireworkingradiusovermediumrange,mobilecra
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ollerslewing
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7/29/2019 Rtr Bearing
28/52
RTR
Bearing
2
RTR Bearing
www.rtr-slewing.com
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www.rtr-slewing.com
-
7/29/2019 Rtr Bearing
42/52
RTR
Bearing
38
RTR Bearing
www.rtr-slewing.com
-
7/29/2019 Rtr Bearing
43/52
RTR
Bearing
3
RTR Bearing
www.rtr-slewing.com
-
7/29/2019 Rtr Bearing
44/52
RTR
Bearing
0
RTR Bearing
www.rtr-slewing.com
-
7/29/2019 Rtr Bearing
45/52
RTR
Bearing
1
RTR Bearing
www.rtr-slewing.com
-
7/29/2019 Rtr Bearing
46/52
RTR
Bearing
2
RTR Bearing
www.rtr-slewing.com
-
7/29/2019 Rtr Bearing
47/52
RTR
Bearing
3
RTR Bearing
www.rtr-slewing.com
-
7/29/2019 Rtr Bearing
48/52
RTR
Bearing
RTR Bearing
www.rtr-slewing.com
-
7/29/2019 Rtr Bearing
49/52
RTR
Bearing
5
RTR Bearing
www.rtr-slewing.com
-
7/29/2019 Rtr Bearing
50/52
RTR
Bearing
RTR Bearing
www.rtr-slewing.com
-
7/29/2019 Rtr Bearing
51/52
-
7/29/2019 Rtr Bearing
52/52