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Calculations

Specific bearing load Calculation example p = k .pc

(15)pspecific bearing load [N/mm2]Pequivalent dynamic load [N],see equation (13), page 8Cbasic dynamic load rating [N], see tableskspecific load factor [N/mm2]for sliding contact surfaces steel on nylon/teflon/fib The rod assemly of a conveyor equipment calls for a DURBAL heavy-duty rod end with a working life of 8,000 hours in conjunction with an alternating acting load of 5,000 N. 25 swiveling movements with a swiveling angle of 30° take place per minute. The operating temperature amounts to approx.60 °C. The choice is a
DURBAL heavy-duty rod end EF 15 with C = 19415 N, d
8 = 22 mm. er glassk = 50 N/mm

Working life

Gh= C 1 .C 2 .C 3 .5 C .10

.

6 2 d 8 . .fP c
1 =0,25 (alternating load direction, f = 25 min-1

Mean sliding velocity

2 =1,0 (operating temperature 60 °C)d
C 3 = 17.

(

C 2 .C = 1,0 .19415 = 3,88.P 5000

V

7 m= 5,82 .10-.d 8 . .f (16)V
8 =22 mmf =25 min
-1 m mean sliding velocity [m/s]d8joint ball diameter[mm], see tablesßhalf the swiveling angle [degrees], ß = 90° should be used for rotationffrequency of oscillation [min-1] b =15° (half the swiveling angle:30°:2 = 15°)C =19415 N P =5000 N
G h = 0,25.1,0.17.5 .19415 .10 622.15.25 5000 = 10000 h > 8000 h

Checking the permissable load of the rod end

Pzul.=C
o · c
2 · c
4 C
o =48545 Nc
2 =1,0 (operating temperature 60 °)c
4 =0,2 (alternating load) P
zul = 48545.1,0.0,2 = 9709 N > 5000 N

Checking the permissable sliding velocityChecking the p · v-value

V
77 m = 5,82.10-.d
8 . .f = 5,82.10- .22.15.25 = 0,0048m/s
2 C 19415 p V
m = 12,87 .0,0048= 0,061N/mm
2 . m/s
2 . m/s

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