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Type Selection Calculation
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Type Selection Calculation

一、Calculation for single-row ball slewing ring
1、Capacity of slewing ring
 C0 = f ·D·d
 In Equality:Co ——Capacity of bearing ,kN
        f ——Capacity factor ,0.108 kN / mm2
        D ——Diameter of track center ,mm
        d ——Diameter of ball ,mm
2、Loading calculation

 In Equality:Cp ——Loading caculation , kN
        M ——Toppling movement ,kN·m
        Fa ——Axial force ,kN
        Fr ——Radial force ,kN
3、Safety factor calculation
   fs = Co / Cp
   fs see the following table。
二、 Calculation for 3-row-roller slewing ring bearing
1、Capacity of slewing ring
 C0 = f ·D·d
 In Equality:Co ——Capacity of bearing ,kN
        f ——Capacity factor ,0.172 kN / mm2
        D ——Diameter of track center,mm
        d ——Upper row roller diameter,mm
2、Loading caculation

 In Equality:Cp ——Loading caculation,kN
        M ——Toppling movement ,kN·m
        Fa ——Axial force,kN
3、Safety factor calculation
   fs = Co / Cp
   fs see the following table 。
   Slewing ring safety factor fs

Types

Characteres

Examples

fs

light duty

not often at full capacity ,Slewing Speedfast,  assault  small steadily

Pile the material fetching machine ,struck-crane,nonuse for port  wheel-crane

1.00~1.15

middle duty

not often at full capacity,Slewing Speed faster,assault 

tower-crane,use for baot crane,pedrail-crane

1.15~1.30

heavy duty

Often at full capacity ,Slewing Speed faster, assault big quickly

grab-bucket-crane,n port-crane,single bucket excavator ,Container crane

1.30~1.45

extremely heavy duty

At full capacity ,assault big quickly or the workplace condition is abominable

bucket wheel excavator ,tunnel borer,metallurgy crane,offshore platform crane

1.45~1.70