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Locking Assembly RfN 7012 for bending loads

Typical belt drum application

The bending moment acting on the hub/shaft connection is the main load to evaluate in a belt drum or similar application. Excessive bending moments can cause overstress in the webs between the screw holes in the locking assembly. In the case of additional loads (bending moments/ radial loads) screw tightening torques may have to be reduced. To limit the influence of the bending load on the locking assembly connection we use the following criteria during the belt drum design process:

- Shaft deflection from the bending moments can only have a maximum deflection fm < 1/2000 * L (bearing centre distance).
- For the permissible bending load values please refer to our tables.

If the pressures are too high for the application please note datasheets Mb 20% - Mb 80% with reduced bending moments.

RINGFEDER® RfN 7012

metric inch
CAD d D L L1 T pW pN TAred. Mbmax. pWmax bei Mbmax pNmax bei Mbmax Tres bei Mbmax
  mm mm mm mm Nm N/mm2 N/mm2 Nm Nm N/mm2 N/mm2 Nm
  100 145 47 33 9591 196 135 125 7210 331 228 6325
  110 155 47 33 10488 177 126 125 7840 311 221 6966
  120 165 47 33 13004 184 134 125 8960 325 236 9425
  130 180 52 38 17522 162 117 125 11310 285 206 13383
  140 190 52 38 20661 164 121 125 10160 268 197 17991
  150 200 52 38 24046 167 125 125 9020 252 189 22290
  160 210 52 38 27674 169 129 125 7870 239 182 26532
  170 225 60 44 32486 157 119 190 21570 291 220 24292
  180 235 60 44 37391 161 123 190 18960 273 209 32227
  190 250 68 52 45890 147 111 190 24070 242 184 39071
  200 260 68 52 51590 149 114 190 21150 228 176 47056
  220 285 74 56 66374 146 112 295 32670 242 187 57777
  240 305 74 56 83094 153 120 295 20330 208 164 80569
  260 325 74 56 101512 159 127 295 16810 201 161 100111
  280 355 86,5 66 124233 140 111 405 38440 204 161 118136
  300 375 86,5 66 149101 146 117 405 24820 185 148 147020
  320 405 100,5 78 207104 149 118 580 37220 188 148 203732
  340 425 100,5 78 219216 140 112 580 57920 196 157 211426
  360 455 116 90 282418 138 109 780 74630 189 150 272379
  380 475 116 90 297102 130 104 780 87000 187 150 284078
  400 495 116 90 311738 123 99 780 150460 217 175 273024
  420 515 116 90 362587 130 106 780 93580 186 151 350303
  440 545 130 102 442836 126 102 1000 113140 176 142 428139
  460 565 130 102 461680 121 98 1000 177330 195 159 426266
  480 585 130 102 504497 121 99 1000 168140 189 155 475653
  500 605 130 102 549139 121 100 1000 158960 183 151 525629
  520 630 130 102 582655 119 98 1000 194480 192 158 549239
  540 650 130 102 603639 114 95 1000 258670 207 172 545408
  560 670 130 102 666213 117 98 1000 212800 191 160 631313
  580 690 130 102 717182 118 99 1000 203610 186 156 687672
  600 710 130 102 740342 114 96 1000 267800 200 169 690210
  620 730 130 102 793992 114 97 1000 258610 195 166 750696
  640 750 130 102 849441 115 98 1000 249429 190 162 811994
  660 770 130 102 906684 115 99 1000 240240 186 159 874277
  680 790 130 102 932418 111 96 1000 304420 198 171 881324
  700 810 130 102 1026541 116 100 1000 221870 177 153 1002277
  720 830 130 102 1054013 112 97 1000 286050 189 164 1014455
  740 850 130 102 1117486 113 98 1000 276870 185 161 1082644
  760 870 130 102 1182737 113 99 1000 267680 182 159 1152048
  780 890 130 102 1230829 112 98 1000 295180 185 162 1194909
  800 910 130 102 1279783 111 97 1000 322680 189 166 1238436
  820 930 130 102 1349444 111 98 1000 313500 185 163 1312524
  840 950 130 102 1420874 111 98 1000 304310 182 161 1387904
  860 970 130 102 1494068 112 99 1000 295130 178 158 1464629
  880 990 130 102 1569025 112 100 1000 285940 175 156 1542750
  900 1010 130 102 1624087 111 99 1000 313440 178 159 1593554
  920 1030 130 102 1680004 110 98 1000 340940 182 162 1645045
  940 1050 130 102 1759331 110 99 1000 331750 179 160 1727770
  960 1070 130 102 1840411 110 99 1000 322570 176 158 1811922
  980 1090 130 102 1899788 109 98 1000 350070 179 161 1867256
  1000 1110 130 102 1960015 108 98 1000 377570 182 164 1923305
CAD d D L L1 T pW pN TAred. Mbmax. pWmax bei Mbmax pNmax bei Mbmax Tres bei Mbmax
  inch inch inch inch ft-lbs psi psi ft-lbs ft-lbs psi psi ft-lbs
  3.937 5.709 1.850 1.299 7074 28406 19565 92 5318 47971 33043 4665
  4.331 6.102 1.850 1.299 7736 25652 18261 92 5783 45072 32029 5138
  4.724 6.496 1.850 1.299 9591 26667 19420 92 6609 47101 34203 6952
  5.118 7.087 2.047 1.496 12924 23478 16957 92 8342 41304 29855 9871
  5.512 7.480 2.047 1.496 15239 23768 17536 92 7494 38841 28551 13270
  5.906 7.874 2.047 1.496 17736 24203 18116 92 6653 36522 27391 16440
  6.299 8.268 2.047 1.496 20412 24493 18696 92 5805 34638 26377 19569
  6.693 8.858 2.362 1.732 23961 22754 17246 140 15909 42174 31884 17917
  7.087 9.252 2.362 1.732 27579 23333 17826 140 13984 39565 30290 23770
  7.480 9.843 2.677 2.047 33847 21304 16087 140 17753 35072 26667 28818
  7.874 10.236 2.677 2.047 38051 21594 16522 140 15600 33043 25507 34707
  8.661 11.220 2.913 2.205 48956 21159 16232 218 24096 35072 27101 42615
  9.449 12.008 2.913 2.205 61288 22174 17391 218 14995 30145 23768 59425
  10.236 12.795 2.913 2.205 74872 23043 18406 218 12399 29130 23333 73839
  11.024 13.976 3.406 2.598 91631 20290 16087 299 28352 29565 23333 87134
  11.811 14.764 3.406 2.598 109973 21159 16957 299 18307 26812 21449 108438
  12.598 15.945 3.957 3.071 152754 21594 17101 428 27452 27246 21449 150267
  13.386 16.732 3.957 3.071 161688 20290 16232 428 42720 28406 22754 155942
  14.173 17.913 4.567 3.543 208304 20000 15797 575 55045 27391 21739 200899
  14.961 18.701 4.567 3.543 219134 18841 15072 575 64169 27101 21739 209528
  15.748 19.488 4.567 3.543 229929 17826 14348 575 110975 31449 25362 201375
  16.535 20.276 4.567 3.543 267434 18841 15362 575 69022 26957 21884 258374
  17.323 21.457 5.118 4.016 326623 18261 14783 738 83449 25507 20580 315783
  18.110 22.244 5.118 4.016 340522 17536 14203 738 130794 28261 23043 314402
  18.898 23.031 5.118 4.016 372103 17536 14348 738 124015 27391 22464 350828
  19.685 23.819 5.118 4.016 405030 17536 14493 738 117244 26522 21884 387689
  20.472 24.803 5.118 4.016 429750 17246 14203 738 143443 27826 22899 405103
  21.260 25.591 5.118 4.016 445227 16522 13768 738 190788 30000 24928 402278
  22.047 26.378 5.118 4.016 491380 16957 14203 738 156955 27681 23188 465639
  22.835 27.165 5.118 4.016 528973 17101 14348 738 150177 26957 22609 507208
  23.622 27.953 5.118 4.016 546055 16522 13913 738 197522 28986 24493 509080
  24.409 28.740 5.118 4.016 585626 16522 14058 738 190743 28261 24058 553692
  25.197 29.528 5.118 4.016 626524 16667 14203 738 183972 27536 23478 598904
  25.984 30.315 5.118 4.016 668745 16667 14348 738 177194 26957 23043 644842
  26.772 31.102 5.118 4.016 687725 16087 13913 738 224532 28696 24783 650040
  27.559 31.890 5.118 4.016 757148 16812 14493 738 163645 25652 22174 739251
  28.346 32.677 5.118 4.016 777410 16232 14058 738 210982 27391 23768 748234
  29.134 33.465 5.118 4.016 824226 16377 14203 738 204212 26812 23333 798528
  29.921 34.252 5.118 4.016 872354 16377 14348 738 197433 26377 23043 849718
  30.709 35.039 5.118 4.016 907825 16232 14203 738 217716 26812 23478 881331
  31.496 35.827 5.118 4.016 943932 16087 14058 738 238000 27391 24058 913436
  32.283 36.614 5.118 4.016 995312 16087 14203 738 231229 26812 23623 968081
  33.071 37.402 5.118 4.016 1047997 16087 14203 738 224451 26377 23333 1023679
  33.858 38.189 5.118 4.016 1101983 16232 14348 738 217680 25797 22899 1080269
  34.646 38.976 5.118 4.016 1157269 16232 14493 738 210901 25362 22609 1137889
  35.433 39.764 5.118 4.016 1197881 16087 14348 738 231185 25797 23043 1175361
  36.220 40.551 5.118 4.016 1239124 15942 14203 738 251468 26377 23478 1213339
  37.008 41.339 5.118 4.016 1297633 15942 14348 738 244689 25942 23188 1274355
  37.795 42.126 5.118 4.016 1357435 15942 14348 738 237919 25507 22899 1336423
  38.583 42.913 5.118 4.016 1401230 15797 14203 738 258202 25942 23333 1377236
  39.370 43.701 5.118 4.016 1445652 15652 14203 738 278485 26377 23768 1418576

Characteristics

  • One of the most demanding challenges of our promise of performance is the conveyor pulley application field. The extreme loads which such components are subject to, especially the high bending moment, coupled with the simultaneous indispensable reliability and longest possible service life, require the highest of engineering know-how. Our international development team, which has already set benchmarks in quality Locking Assemblies for the RfN 7012, RfN 7012.2, RfN 7015.0 and RfN 7015.1 products, is here setting a further milestone.
  • Quality means: high-quality materials and material services, and the most precise workmanship, guarantee sustainable product usage.
  • Performance means: reliability, and long service life means: minimization of machine downtime and maximization of service life.
  • Price means: not just the newest, but also the most economical RINGFEDER Locking Assemblies product at the high level of performance you are used to.

Typical belt drum application

The bending moment acting on the hub/shaft connection is the main load to evaluate in a belt drum or similar application. Excessive bending moments can cause overstress in the webs between the screw holes in the Locking Assembly. In the case of additional loads (bending moments/ radial loads) screw tightening torques may have to be reduced. To limit the influence of the bending load on the locking assembly connection we use the two following criteria during the belt drum design process:

  • Shaft deflection from the bending moments may only have a maximum deflection fm < 1/2000 · L (bearing centre distance).
  • The permissible bending load values as shown in the Table / CAD data tab.

Explanation to table

A bending moment, created by radial forces, results in an additional load for the Locking Assembly, shaft and hub. This load creates an additional pressure, works in rotation and has to be superpositioned with the pressure resulting from the Locking Assembly. For a viable connection, a minimum surface pressure at the contact areas between Locking Assembly, shaft and hub must be maintained, as soon as shaft and hub have to take up the maximal pressures. Additionally, the listed torque values (T) have been reduced due to the additional bending moments. To achieve lower stresses for the Locking Assemblies the screw tightening torques (TA) have also been reduced.

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