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HOME >Service > >slewing bearing Selection

Selection

because difference working condition ,most slewing bearings are all operating under eccentric load, except supporting axial load ,except supporting axial load and radial load ,bearing also has to overcome tilting moment. so using load moment diagram as slewing .bearing selection method is the way which the present customers adopt generally while selecting type and calculating.

necessary technical data


load what bearing supported

each load and percentage share of operating time

rotating speed or number  of revolutions under each load

circumferential force on gear

slewing bearing dimension

other operating conditions


according to the information in catalog ,using static and dynamic load curve  customers can preliminary select slewing bearing as

per the method of type selection and calculation, then communicate with our technical department and confirm it. also the corresponding information of slewing bearing could be supplied to our company and type selection and calculation would be done by us. if you want us to design  and select type ,please ask type selection technical parameter sheet and fill it carefully. So we can submit not only exact but also economical and  practical slewing bearing type selection solution to you as soon as possible.

company


department


telephone


fax


Application

Occasion

(main machine typename)

Rotation axis

Bracket mounting

way

Revolutions per minute

Load    stability

Ambient

temperature


Horizontal

vertical

Seat –type

Installation

Suspension

installation

Normal

max

Equably and

Steady

Impact

vibration


company


department


telephone


fax


Application property

Only location    interval    rotation   continuous rotataion

Application property

Load  data

Nominal working load

Max working load

Test load


Axial load parallel to rotation





Radial load normal to rotation

     axis





Moment from axial load





Total moment





Drive torque what  bearing    support

Number    of  drive pinion

normal

max

position

Space

degree

Requirement for slewing bearing type and boundary dimension

                  Slewing bearing model   number

Type of rolling

Single row ball  roller    tri -row roller combined

Boundary dimension

Outer diameter  inner diameter     assembling height

Mounting    hole

parameter

Mounting hole center circle of inner ring

Mounting hole diameter

Number of mounting hole

Gear parameter

Interal    gear  external gear  no gear


Large gear

pinion


Large gear

pinion


Module m


Displacement coefficientx




Number of teeth z


Tip clearance coefficient




Pressure angle a


Tooth width d




Coefficient ha


Accuracy class



Working condition description for continuous load and variable   load


Axial    load  KN

Radial load KN

Tilting moment KNM

Rotating speedr/min

Working

Hours %

1






2






3






4






5






6






7






8






life

Continuous running working condition:

Life at speed of                    r/min min     hours

Interval running working condition

At degree of +/-                      cycle

Other requirement


slewing bearing load cure listed this catalogue shows that bearing adopt steel 42crmo to manufacture, it is allowable static load curve under condition of ball bearing allowable contact stress 360MPa and roller bearing allowable contact stress 2460MPA.bolt ultimate.

oad curve is comfirmed. when connecting length if five times of bolt nominal diameter and pre-stress is 70% of bolt material yield limit.

 

Slewing bearing load cure figures list in this this catalogue are only part lyjw products in catalogue, part. if  products selected  has no load curve or not listed  in lyjw catalogue ,parts of product bolt curve only meet original main machines application requirement. when selecting, if bolt curve can not meet load requirement , may properly increase bolt diameter and quantity, please contact with lyjw related department.

To  calculate slewing bearing load as per difference structure ,the specific type selection methods are listed in table8


Calculating

method

 

slewing

bearing

structural style

Equivalent static load for type selection   under static working condition

Equivalent dynamic load for type   selection under dynamic working condition

Four point contact

Ball slewing bearing

(α=45o)

While Fr0.44Fa

Fa=(Fa+2.3Fr)*fS

While Fr>0.44Fa,please contact   technical department

M=m*fs

While Fr0.8fa

Fa=(059Fa+1.18Fr)*fi

While Fr0.8Fa

Fa=(Fa+0.66Fr)*FI

M=M*f1

 

Cross roller slewing bearing.

(α=45o)

While Fr0.44Fa

Fa=(Fa+2.3Fr)*fS

While Fr>0.44Fa,please contact   technical department

M=m*fs

While Fr067Fa

Fa=(0.67+1.5Fr)*fi

While Fr0.67Fa

Fa=(Fa+Fr)*FI

M=M*f1

 

Tri-row roller slewing

bearing

Fa=Fa*fs

M=M*fs

Fa=Fa*fl

M=M*fl

Radial load Fr is supported by one row   roller which support radial load

In formula

Fa-total -axial load what bearing suppprt(KN)

Fr-total radial load what bearing support on ment acting plane(KN)

M total tilting moment what bearing support

Faequivalent center axial load of bearing(KN)

M equivalent tilting moment of bearing

Fs  static load safet factor

F1 load coefficient estimate life


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