Renold Couplings Cat 7th-4 - Industrial and Bearing Supplies
Renold Couplings Cat 7th-4 - Industrial and Bearing Supplies
Renold Couplings Cat 7th-4 - Industrial and Bearing Supplies
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Rubber<br />
Grade<br />
SM 60<br />
SM 70<br />
SM 80<br />
Rubber<br />
Grade<br />
SM 60<br />
SM 70<br />
SM 80<br />
Temp max<br />
100<br />
100<br />
100<br />
SM 70 is considered “st<strong>and</strong>ard”<br />
Dynamic<br />
Magnifier<br />
at 30ºC<br />
(M30 )<br />
8<br />
6<br />
4<br />
SM 70 is considered “st<strong>and</strong>ard”<br />
2.5 Prediction of the actual coupling<br />
temperature <strong>and</strong> torsional<br />
stiffness<br />
2.5.1 Use the torsional stiffness as published in the catalogue,<br />
which is based upon data measured at 30°C <strong>and</strong> the<br />
dynamic magnifier at 30°C. (M30)<br />
2.5.2 Compare the synthesis value of the calculated heat load in<br />
the coupling (Pk ) at the speed of interest to the “Allowable<br />
Heat Dissipation” (Pkw ).<br />
The coupling temperature rise<br />
°C = Tempcoup = PK<br />
PKW<br />
x 70<br />
( )<br />
The coupling temperature = ϑ<br />
ϑ = Tempcoup + Ambient Temp.<br />
2.5.3 Calculate the temperature correction factor St from 2.6 (if<br />
the coupling temperature > 100°C, then use St100 ).<br />
Calculate the dynamic Magnifier as per 2.7. Repeat the<br />
calculation with the new value of coupling stiffness <strong>and</strong><br />
dynamic magnifier.<br />
2.4 Calculate the coupling temperature as per 2.5. Repeat<br />
calculation until the coupling temperature agrees with the<br />
correction factors for torsional stiffness <strong>and</strong> dynamic<br />
magnifier used in the calculation.<br />
RB Technical Data<br />
S t<br />
St100 = 0.75<br />
St100 = 0.63<br />
St100 = 0.58<br />
Dynamic<br />
Magnifier<br />
at 100ºC<br />
(M100 )<br />
10.7<br />
9.5<br />
6.9<br />
70<br />
2.6 Temperature Correction Factor<br />
Temperature Correction Factor St<br />
1<br />
0.9<br />
0.8<br />
0.7<br />
0.6<br />
0.5<br />
30 40 50 60 70 80 90 100<br />
RUBBER TEMPERATURE ° C<br />
2.7 Dynamic Magnifier Correction<br />
Factor<br />
The Dynamic Magnifier of the rubber is subject to temperature<br />
variation in the same way as the torsional stiffness.<br />
MT = M 30<br />
S t<br />
Rubber<br />
Grade<br />
SM 60<br />
SM 70<br />
SM 80<br />
SM60 SM70 SM80<br />
Dynamic<br />
Magnifier<br />
(M30) 8<br />
6<br />
4<br />
ϕ T = ϕ 30 x S t<br />
SM 70 is considered “st<strong>and</strong>ard”<br />
Relative<br />
Damping<br />
ϕ30 0.78<br />
1.05<br />
1.57<br />
For more information telephone us on +44 (0) 29 20792737 or fax +44 (0) 29 20791360 E-Mail: cardiff.sales@renold.com
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