23239-6pp-A4T4

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The Metaldyne damper is one of the most efficient and reliable devices for controlling resonant torsional vibration conditions and therefore extending engine life. The Metaldyne design allows the damper to operate at a high level of efficiency over a wide range of vibration frequencies.

Metaldyne has over 60 years of design and application experience of torsional vibration dampers for slow, medium and high speed diesel engines as well as other drive line applications.

Illustrated Damper size: ø 2765 x 415mm

Construction Details

23239-6pp-A4T2-2

The Metaldyne damper consists of:- an inertia ring freely supported and located by bearings inside the casing the casing is sealed by the cover plate which can be either rolled or bolted screwed removable filling plugs are fitted, where possible, to all dampers above 470mm to allow fluid samples to be taken.

The clearance between the inertia ring and casing is filled with a measured amount of highly viscous silicone fluid.

Three basic methods are employed to seal the cover to the casing; welding, machine rolling or bolting. The exact method used is dependent upon damper size and customer requirements.

23239-6pp-A4T3

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The Metaldyne viscous damper provides torsional vibration damping by the shearing effect of a highly viscous silicone fluid enclosed between the inner ring and outer casing.

The damper casing incorporates a mounting flange which is rigidly attached to the fore end of the crankshaft and houses an inertia ring which is freely supported and located by bearings inside the casing.

Under conditions of zero torsional vibration the damper casing and inertia ring rotate at uniform velocity with the viscous fluid transferring the torque between them. As the engine speed changes to a point where torsional vibration is present the crankshaft and damper casing are subject to torsional oscillation superimposed on the mean rotation.

Because of its inertia effects the inner ring continues to rotate at a constant angular velocity creating an oscillating anti- phase movement between itself and the casing.

This relative movement shears the film of silicone fluid, absorbing vibration energy which is dissipated as heat through the external surfaces of the damper casing. Dissipation of heat is critical to the efficient life of the damper.

Analysis Expertise

Metaldyne’s calculation programmes analyse the steady state torsional vibration characteristics by the classical resonant analysis and by the more sophisticated Forced/Damped torsional vibration analysis technique. This approach assures the customer of the most cost effective solution for their specific applications. Metaldyne also pioneered the application of large (>2 metre) viscous torsional vibration dampers for large slow speed 2 and 4 stroke engines to control torsional vibrations in the propeller and intermediate shafts on propulsion systems.

Design Skills

Metaldyne has a vast experience in the application and design of viscous torsional vibration dampers on high, medium and low speed diesel engines. Further product applications can include transmission dampers for machine tools to prevent gear chatter, vehicle (truck, trams and bus) transmission dampers to prevent harshness and noise which contribute to passenger discomfort, and diesel engine camshaft dampers to limit the stresses in the camshaft due to its self imposed torsional vibration excitation. Customers are invited to contact Metaldyne where data requirements can be discussed and a detailed study of the torsional vibration characteristics of the system will be conducted using the latest in-house computer programmes. This is a specific requirement for large 2 stroke engines. Applied Technology Customers are assured of optimum solutions to their duty cycle needs with Metaldyne’s applied technology.

  • In-house torsional vibration programmes
  • Finite element design tools
  • Expertise to confirm predictions by measurement
  • NVH evaluation tools
  • Comprehensive rig testing
  • Performance & condition monitoring

Photograph courtesy of M.A.N. B&W Copenhagen

Applied Technology

Customers are assured of optimum solutions to their duty cycle needs with Metaldyne’s applied technology.

  • In-house torsional vibration programmes
  • Finite element design tools
  • Expertise to confirm predictions by measurement
  • NVH evaluation tools
  • Comprehensive rig testing
  • Performance & condition monitoring

(D) Outer Dia. [mm] (Dm) Minor Dia.
[mm]
(W) Width
[mm]
(Rd) Recess Dia.
[mm]
Ring Inertia [kgm²] Case Inertia [kgm²] Effective Inertia
[kgm³]
Ring Area [m²] Surface Area [m²] Clearance Factor
[mm³]
Weight [kg]
330 Rolled 51 184 0.233 0.15 0.267 0.159 0.2 10.31 21.86
355 Rolled 60 184 0.389 0.236 0.432 0.194 0.25 8.77 29.86
356 Welded 62.5 184.34 0.389 0.269 0.463 0.196 0.252 8.77 33.6
400 Rolled 65 210 0.8 0.37 0.77 0.252 0.29 20 48.4
460 Rolled 70 216 1.42 0.81 1.52 0.324 0.4 19.5 65
471 454 95 218 1.905 1.135 2.088 0.363 0.45 31 97
489 Rolled 87 254 2.323 1.166 2.328 0.373 0.48 44 94
508 Rolled 75 254 2.481 1.226 2.467 0.404 0.48 50.4 95
515 496 75 255 1.962 1.373 2.354 0.36 0.46 43 94
520 Rolled 80 280 2.64 1.47 2.79 0.404 0.503 51 98
520 520 110 325 2.6 1.87 3.17 0.404 0.551 63.3 104
555 540 100 254 4 2.39 4.39 0.487 0.61 70 149
580 Rolled 60 349 2.28 2.16 3.3 0.351 0.51 65 80
585 580 100 330 4.66 3.36 5.69 0.5 0.654 91.25 148
590 575 150 316 7.9 3.6 7.55 0.657 0.78 91 224
600 Welded 90 300 4.72 2.88 5.24 0.541 0.679 45.8 139.1
620 604 95 325 5.79 3.53 6.42 0.54 0.68 75 160
635 619 100 395 5.59 4.22 7.01 0.52 0.68 81 153
636 616 127 310 7.97 5.01 8.997 0.6 0.81 122 217
645 629 100 388 6.45 4.31 7.53 0.56 0.7 109 165
645 635 105 308 7.6 4.85 8.65 0.625 0.8 108 205
665 650 95 343 7.63 4.81 8.62 0.62 0.78 106 195
690 675 80 450 5.8 5.5 8.4 0.51 0.68 95.5 159
690 675 110 388 10 6 11 0.675 0.85 122 210
700 686 120 460 9.87 7.85 12.78 0.656 0.84 169 235
700 683 155 440 12.05 8.75 14.775 0.787 1.021 185.46 273
710 695 125 350 13.46 7.99 14.72 0.785 0.98 180 291
720 706 135 350 15.98 8.72 16.71 0.848 1.04 171 325
730 722 135 400 16.97 9.02 17.5 0.854 1.04 190 322
740 726 110 400 12.84 9.07 15.49 0.738 0.97 153 269
750 750 100 390 14.22 8.53 15.65 0.764 1 174 265
750 750 130 410 19.42 8.54 18.25 0.901 1.093 190 324
760 746 165 432 23.15 12.26 23.84 0.978 1.19 243 392
762 746 120 440 16 9.94 17.94 0.81 1.02 201 285
770 756 90 500 9.73 9.29 14.16 0.62 0.86 174 192
770 756 120 432 16.96 10.59 19.07 0.84 1.05 193 304
790 777 115 502 15.1 12.94 20.49 0.765 1.01 174 276
790 787 140 440 22 15.4 26.4 0.925 1.21 251 388
790 767 180 474 25.5 17.1 29.85 1.02 1.27 287 440
800 785 115 440 19.6 12 21.7 0.893 1.11 232 338
800 790 140 440 21.2 17.5 28 0.92 1.22 251 390
800 790 160 330 30 17 32 1.13 1.37 239 520
810 800 170 440 27.3 22.1 35.7 1.03 1.36 250 495
845 822 160 440 34.32 18.83 35.99 1.138 1.463 307 497
850 836 160 435 38 16 35 1.2 1.44 320 505
850 827 185 440 42 21 42 1.26 1.51 343 590
850 835 210 420 43 32 53 1.28 1.65 354 694
860 840 120 500 26 16 29 0.97 1.22 265 370
860 838 175 460 40.5 21.8 42 1.22 1.48 349 571
900 885 155 450 44 25 47 1.26 1.56 349 575
910 889 120 500 31 23 39 1.07 1.37 332 431
950 927 160 670 37.5 33.2 52 1.11 1.45 327 455
960 937 140 630 39.49 32.21 51.96 1.12 1.44 451 493
965 940 165 505 54 41 68 1.33 1.74 469 688
975 948 235 475 92.18 47.76 93.85 1.75 2.11 606 1018
995 980 210 500 78.5 63.42 102.7 1.58 2.09 6.21 1003
996 977 150 520 62.39 37.18 68.38 1.44 1.78 526 672
1020 1003 200 520 96.7 49.3 97.65 1.73 2.11 606 948
1070 1064 149 592 78.5 45 84.25 1.792 2.026 579 714
1075 1054 165 600 77.96 68.11 107 1.51 2.04 613 835
1100 1073 200 600 109.7 64.7 119.55 1.856 2.403 735 960
1105 1080 215 445 135.4 89.3 157 2.02 255 772 1340
1140 1120 215 450 173.6 82.89 169.7 2.28 2.17 889 1424
1180 1157 140 695 91.04 87.5 133 1.58 2.16 761 849
1190 1165 140 692 90.7 91.83 137.2 1.56 2.2 775 849
1200 1175 180 630 155.6 93.94 171.7 2.07 2.57 968 1166
1270 1244 160 629 158.8 128.7 208 2.13 2.75 1088 1196
1300 1280 210 600 256.8 149.6 278 2.52 3.25 1299 1592
1350 1335 160 850 208.5 135 239 2.26 2.76 1477 1162
1410 1389 180 720 306.4 179.3 332.5 2.77 3.14 1547 1594
1515 1480 240 875 459.9 351.7 581.7 3.07 4.01 2067 2296
1530 1508 230 940 474.4 337.5 574.7 3.09 3.95 2243 2195
1650 1620 300 950 889.6 547.5 992.3 4.09 5.13 2676 3404
1860 1839 360 1000 1873 981 1917 5.61 6.95 4440 5574
1980 1961 360 1180 2239 1351 2470 5.73 8 5904 5987
2100 2066 350 1100 2825 1747 3160 6.54 8.68 6480 7235
2160 2124 350 1340 2852 1861 3287 6.28 8.07 5243 6347
2200 2170 350 1000 3436 2110 3828 7.3 9.31 6141 7864
2280 2262 380 1181 4598 2520 4819 8.05 9.96 10327 8851
2300 2270 350 1086 4286 2171 4314 7.88 9.93 10245 8432
2450 2424 380 1470 4448 3919 6142 7.37 10.48 11459 8700
2560 2538 360 1270 6432 4026 7242 9 11.89 12076 10552
2650 2634 390 1160 8788 4802 9196 10.75 13.43 13014 13263
2700 2676 360 1750 6845 5292 8714 8.76 11.44 14346 9882
2765 2750 415 1750 8796 6479 10877 9.78 12.94 13938 12303
2770 2756 460 1750 10290 6768 11913 10.58 13.63 15844 13615
2900 2900 435 1750 12330 7618 13783 11.511 14.754 12703 13694
2990 2990 460 1750 15220 9223 16876 12.56 16.05 19200 17086
3000 3000 435 1590 14712 9417 16773 12.7 16.439 14902 17011
3200 3200 400 1920 17270 10690 19325 13.21 16.73 22687 17286