KWD BK70A.009 Buffer/ Bolts Complete

3
technical features
coupling selection The coupling shall be designed according to DIN 740, sheet 2.
In doing so, it is required to dimension the coupling so that the occurring stresses won‘t exceed the permissible value in any
operating condition.
nominal torque:
TKN ≥ TN • st
maximum torque:
TKmax ≥ Tmax • st • sa
Here, the temperature factor st takes the reduction of the resilience of the coupling buffer in case of higher environmental temperatures
into account.
ambient temperature in °C
st < 30 °C
< 40 °C
< 60 °C
standard element NR-SBR
1,0
1,1
1,3
1,6
-
NBR (Perbunan)
1,0
1,0
1,0
1,2
1,8
PUR
1,0
1,2
1,4
1,8
-
< 80 °C < 100 °C
The start-up factor sa takes an additional stress due to the frequency of torque impulses (starting and braking) into account.
starting frequency/h start-up factor sa
< 60
< 120
< 240
1,0
1,2
1,3
1)
2)
3)
In case of stress of the coupling due to a vibratory torque as well as in case of torque impulses and high moments of inertia between
drive and output side, you should fall back to a higher calculation procedure.
The specified characteristic values refer to the material steel for the coupling components and the grooved buffer made of NR-SBR
with a 75 Shore A hardness. Changes are possible if other materials are used. Our technical staff will help the user with the technically
correct design of the coupling and the dimensioning.
4) 5)
6)
7) 8)
finish bore according to ISO-fit H7, feather key groove according to DIN 6885
sheet 1, fit JS 9 without feather key groove, pilot bore - free size, „medium“ according to
DIN ISO 2768 deviating hub lengths are possible after consulting the manufacturer; please
indicate the desired length in brackets see „Version/design of the hub bore“
applicable for d1, d2 max, in case of smaller bores, we reserve the right to
perform an adjustment/adaptation.
masses and mass moments of inertia are applicable for d1, d2 max as well
as considering pins and buffers as well as the material steel (St), Masses
and mass moments of inertia for the material cast iron (G) approx. 92 % use in case of higher rotational speeds upon request
rotational speeds for St, in case of material (G) see design S1/S2
Technical changes in the sense of progress are reserved. The constructive design
may deviate from the illustrations, however, the specified dimensions shall be
adhered to.