Rtr Bearing

7/29/2019 Rtr Bearing

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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

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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


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


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


of boltinstallation

FMN


Torsionalmoment

NmM'=0.9MA


of boltinstallation

FMN


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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RTR Bearing

www.rtr-slewing.com

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13

RTR Bearing

www.rtr-slewing.com

:HLJKW

(kg

)

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([W

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d

H

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D2

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m

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mm

mm

mm

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mm

mm

mm

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QJ

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T

104

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104

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494

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126

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94

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4

631

629

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10

11'

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732

528

80

696


18/52

RTR

Bearing

1

RTR Bearing

www.rtr-slewing.com

:HLJKW

(kg

)

7RRWKOHVV

([W

7RRWKLQJ

,QW

7RRWKL

QJ

D

d

H

D1

D2

D3

d1

H1

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m

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DL

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mm

mm

m m

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mm

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mm

mm

mm

mm

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n

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h

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10

80

822

302

2

6


19/52

RTR

Bearing

15

RTR Bearing

www.rtr-slewing.com

:HLJKW

(kg

)

7RRWKOHVV

([W

7RRWKLQJ

,QW

7RRWKL

QJ

D

d

H

D1

D2

D3

d1

H1

b

m

De

De

1RUP

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DL

DL

DL

mm

mm

mm

mm

mm

m m

mm

mm

mm

mm

mm

mm

mm

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HUL

mm

mm

mm

LQJ

QJ

Z

T

10

4N

10

4N

011

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400

12

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100

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2012

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2013

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153

1990

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125

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1540

1260

110

1487

1313

40


20/52

RTR

Bearing

16

RTR Bearing

www.rtr-slewing.com

:HLJKW

(kg

)

7RRWKOHVV

([W

7RRWKLQJ

,QW

7RRWKL

QJ

D

d

H

D1

D2

D3

d1

H1

b

m

De

De

1RUP

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2978


21/52

RTR

Bearing

17

RTR Bearing

www.rtr-slewing.com

12.2

Crossrollerbear

ing

Thesingle-row

crossedrolle

rslewingringiscomposedoftw

oseat-rings.Itfeaturescompactindesign,lightinweight,highprecision

andsmallfittingclearance.

Astherollersare1:1cross

aranged,itissuitableforhighprecisionmountingandcapablet

obearaxialforce,rsultantmomentand

considerablelargeradialforce.

Thesingle-row

crossedrollerslewingringsarewidelyusedforhoisting,transporting,engineeringmachinesaswellasfor

military

products.


22/52

RTR

Bearing

18

RTR Bearing

www.rtr-slewing.com

ZHLJK

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7RRWKOHVV

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24/52

RTR

Bearing

20

RTR Bearing

www.rtr-slewing.com

12.3

Double-rowb

alls

lewing

ring

type

Whentheradialforceislarge

rthan1/10oftheaxailforcethe

racesshouldbenewlydesigne

d.

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Ballslewing

beraringhasthreeseat-rings.T

hesteelballsandthespacersm

aybedirectlyarrangedintothe

upper

andlowerraces.Tworowsofsteelballswithdifferentdiameters

arefittedaccordingtotheforce

bom.

Suchopenmodefittingfeatu

resextraordinaryconvenience.

Theloadanglesofbothupperandlowerracesare90,which

enable

thebearingtobearlargeaxialforceandthetippingmoment.

Astheaxleandthedimensio

nofthedouble-rowballslewing

bearingareratherlarge,thebe

aringconstructionissturdy,hen

ceitis

especiallysuitablefortowercraneswhichrequireworkingradiusovermediumrange,mobilecra

nesandloadingandunloading


25/52

RTR

Bearing

21

RTR Bearing

www.rtr-slewing.com

ZH

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26/52

RTR

Bearing

22

RTR Bearing

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27/52

RTR

Bearing

23

RTR Bearing

www.rtr-slewing.com

12.4

Three-rowr

ollerslewing

ring

type

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rollerslewingbea

ringhasthreeseat-rings,w

hichseparatetheupper,lowerandra

dialraces,v

iawhichtheloadofeachrow

oftherollersmaybespecified.Itmaybeardifferentloadssimultaneouslyanditsloadcapacityisthelargestoneamongthefour

models.

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the

large

sizeof

itsaxle

and

radius,i

tissturdy

and

especiallysuitable

forhearvy-dutymachineswhich

requ

ire

large

workingradius.suchasbucket-wheelexcavators,w

heeledcranes,s

hipcranes,ladleturret,heavy

dutymobilecranesetc


28/52

RTR

Bearing

2

RTR Bearing

www.rtr-slewing.com

:HL

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kg

T

131.25.500

133.25.500

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664

130

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131

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29/52

RTR

Bearing

25

RTR Bearing

www.rtr-slewing.com

:HL

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kg

T

131.45.2000

133.45.2000

16

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125

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18

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139

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30/52

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Bearing

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