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Standard Friction Springs

RINGFEDER® Friction Springs consist of separate inner and outer mating tapered rings which stack together to form a column according to the customer’s wish. These units are repeatedly loaded 100% before delivery. Hereby the absolute functionality is ensured.

RINGFEDER® Reibungsfederelemente

metric inch
Type Type old F se We he D1. d1 b/2 D2G d2G Gwe
kN mm Joule mm mm mm mm mm mm kg
01800 1201 5 0,4 1,0 2,2 18,1 14,4 1,8 18,7 13,9 0,002
02500 1202 9 0,6 2,7 3,1 25,0 20,8 2,5 25,9 20,1 0,004
03200 1203 14 0,8 5,6 4,0 32,0 27,0 3,2 33,1 26,1 0,007
03800 1204 20 0,9 9,0 4,7 38,0 31,7 3,8 39,3 30,6 0,012
04200 1205 26 1,0 13,0 5,2 42,2 34,6 4,2 43,6 33,4 0,018
04800 1206 34 1,1 18,7 5,9 48,2 39,4 4,8 49,8 38,1 0,026
05500 1207 40 1,3 26,0 6,8 55,0 46,0 5,5 56,7 44,5 0,035
06300 1208 54 1,4 37,8 7,7 63,0 51,9 6,3 64,9 50,3 0,056
07000 1209 65 1,6 52,0 8,6 70,0 58,2 7,0 72,1 56,4 0,074
08000 1310 83 1,8 75,0 9,8 80,0 67,0 8,0 83,0 64,0 0,105
09000 1311 100 2,0 100,0 11,0 90,0 75,5 9,0 93,0 73,0 0,145
10000 1312 125 2,2 138,0 12,2 100,0 84,0 10,0 103,0 81,0 0,203
12400 1314 200 2,6 260,0 15,0 124,0 102,0 12,4 128,0 98,0 0,408
13000 1313 160 2,6 208,0 15,0 130,0 111,5 12,4 134,0 108,0 0,376
14000 1315 250 3,0 375,0 17,0 140,0 116,0 14,0 144,0 112,0 0,568
16600* 1316 350 3,7 648,0 20,0 166,0 134,0 16,0 170,0 130,0 0,869
19600 1318 600 4,4 1.320,0 23,4 194,0 155,0 19,0 199,0 150,0 1,676
20000 1317 510 3,9 995,0 22,4 198,0 162,0 18,5 203,0 157,0 1,570
22000 1319 720 4,4 1.584,0 26,4 220,0 174,0 22,0 225,0 169,0 2,573
26200 1320 860 4,8 2.064,0 25,8 262,0 208,0 21,0 268,0 202,0 3,415
30000 1221 1000 5,8 2.900,0 35,8 300,0 250,0 30,0 306,0 245,0 5,510
32000 1222 1200 6,2 3.720,0 38,2 320,0 263,0 32,0 326,0 258,0 7,060
35000 1223 1400 6,6 4.620,0 41,6 350,0 288,0 35,0 356,0 283,0 9,180
40000 1224 1800 7,6 6.840,0 47,6 400,0 330,0 40,0 407,0 324,0 13,560
Type Type old F se We he D1. d1 b/2 D2G d2G Gwe
lbs inch ft-lbs inch inch inch inch inch inch lbs
01800 1201 1,124 0.016 0.74 0.087 0.713 0.567 0.071 0.74 0.55 0.004
02500 1202 2,023 0.024 1.99 0.122 0.984 0.819 0.098 1.02 0.79 0.009
03200 1203 3,146 0.031 4.13 0.157 1.260 1.063 0.126 1.30 1.03 0.015
03800 1204 4,495 0.035 6.64 0.185 1.496 1.248 0.150 1.55 1.20 0.026
04200 1205 5,843 0.039 9.59 0.205 1.661 1.362 0.165 1.72 1.31 0.040
04800 1206 7,641 0.043 13.79 0.232 1.898 1.551 0.189 1.96 1.50 0.057
05500 1207 8,989 0.051 19.18 0.268 2.165 1.811 0.217 2.23 1.75 0.077
06300 1208 12,136 0.055 27.88 0.303 2.480 2.043 0.248 2.56 1.98 0.123
07000 1209 14,608 0.063 38.35 0.339 2.756 2.291 0.276 2.84 2.22 0.163
08000 1310 18,653 0.071 55.32 0.386 3.150 2.638 0.315 3.27 2.52 0.231
09000 1311 22,474 0.079 73.76 0.433 3.543 2.972 0.354 3.66 2.87 0.320
10000 1312 28,092 0.087 101.78 0.480 3.937 3.307 0.394 4.06 3.19 0.448
12400 1314 44,947 0.102 191.77 0.591 4.882 4.016 0.488 5.04 3.86 0.899
13000 1313 35,958 0.102 153.41 0.591 5.118 4.390 0.488 5.28 4.25 0.829
14000 1315 56,184 0.118 276.59 0.669 5.512 4.567 0.551 5.67 4.41 1.252
16600* 1316 78,658 0.146 477.95 0.787 6.535 5.276 0.630 6.69 5.12 1.916
19600 1318 134,842 0.173 973.59 0.921 7.638 6.102 0.748 7.83 5.91 3.695
20000 1317 114,616 0.154 733.88 0.882 7.795 6.378 0.728 7.99 6.18 3.461
22000 1319 161,811 0.173 1168.31 1.039 8.661 6.850 0.866 8.86 6.65 12.286
26200 1320 193,274 0.189 1522.34 1.016 10.315 8.189 0.827 10.55 7.95 7.529
30000 1221 224,737 0.228 2138.95 1.409 11.811 9.843 1.181 12.05 9.65 12.147
32000 1222 269,684 0.244 2743.76 1.504 12.598 10.354 1.260 12.83 10.16 15.565
35000 1223 314,632 0.260 3407.57 1.638 13.780 11.339 1.378 14.02 11.14 20.238
40000 1224 404,527 0.299 5044.98 1.874 15.748 12.992 1.575 16.02 12.76 29.895
* A stroke limitation has to be provided for marked types

Features of RINGFEDER® Friction Springs

RINGFEDER® Friction Springs are employed in the engineering sector when high kinetic energies must be absorbed or when springs of relatively compact dimensions are required for high forces.

RINGFEDER® Friction Springs have multitude features in opposite to other damping systems:

  • High spring work combined with low weight and volume: As RINGFEDER® Friction Springs completely utilise the material of which they are made only a minimum of dimensions and weight are required. The decisive parameter here is therefore the spring work.
  • High Damping Potential: The damping of RINGFEDER® Friction Springs is standard with 66% wherewith the energy will be soon absorbed and resonances complete disabled. Variations are possible with different greases.
  • Overload-safe in blocked position: RINGFEDER® Friction Springs are generally designed to “block”, so it is therefore ensured that the admissible stresses cannot be exceeded and the RINGFEDER® Friction Spring do will not be damaged.
  • Independent of loading rate: The force-travel-diagram of the RINGFEDER® Friction Springs applies for all operating conditions. In contrast to other damping systems, RINGFEDER® Friction Springs provide full spring work and damping effects even, when the load is applied extremely slowly or quickly.
  • Diagram independent of temperature: With hydraulic dampers and springs made of synthetic material, the force-travel diagram will be influenced by temperature fluctuations and inherent temperature rises. The characteristic curve of the RINGFEDER® Friction Springs, however remain independent of these factors and can be used in the temperature range of -20 ° to +60 °C without the curve changing appreciably, as the inherent temperature rises of the spring due to the dampening effect have been taken into account. For extreme applications going beyond the indicated temperature range please consult our technical department.
  • Maintenance-free: Normally, during operation no regreasing of the spring is necessary; however when regreasing is required then only RINGFEDER® specified lubricants can be used to ensure correct spring function.
  • RINGFEDER® Friction Spring Design: If a RINGFEDER® Friction Spring consisting of “e“ elements terminates with half rings its untensioned length will be:

    Lo = e · he

    The total spring travel can be calculated according to the equal:

    s = e · se

    When eliminating the pretensioning force the spring work is given by:

    W = e · We

    The end force does not change with the number of elements.
  • Versatility in design: As well as the standard RINGFEDER® Friction Spring range we can offer special solutions based on you specific application. The graph (to the right) shows the ratio of outer diameter to spring end force, this can be used to quickly see if an application is possible even though a standard spring is not available.
  • Parallel and series arrangement: The geometry of the RINGFEDER® Friction Spring allows an optimum utilisation of the available mounting space due to a nested construction, using parallel or series spring arrangements.

Recommendations for the selection and fitting of RINGFEDER® Friction Springs

  • Pretensioning: RINGFEDER® Friction Springs have to be pretensioned with min. of 5%, preferably 10% of the total spring travel. In order not to impair the lubricant film, the pretensioning force should not exceed 50%. Exceptions are possible after consultation.
  • Pretensioning: For RINGFEDER® Friction Springs some form of guiding is necessary. Exceptions apply for short springs with a length ≤ 1.5 D1, in this case they need to be loaded between parallel thrust plates.
  • Lubrication: ONLY the special greases recommended by RINGFEDER® must be used for lubrication purposes, this is because the cone surfaces are under a high contact pressure. Generally, the grease provided with the spring is sufficient. Re-greasing is not required.
  • Observe the diagram: With buffer springs the available spring work in J, i.e. the area under the loading-curve (above curve), is of interest. If the spring is to be used as a tension device, the recoil curve has to be taken into account (lower curve). Of course, the lower curve can be increased by using a friction reduction lubricant. For this, please let us have your specifications.
  • Sealing: RINGFEDER® Friction Springs have to be assembled with protection against dust and moisture, in order not to impair the lubricating film. Simple sliding guides are sufficient. Under strong dust and moisture, we recommend to use gaiters.

Buffer with RINGFEDER® Friction Springs

The buffer types are standard delivered in one of the following 4 designs. These buffers are suitable for operation temperatures from -20°C to +60°C. Above that, modifications allow an extended temperature range from -73°C to +200°C. Customized requirements with respect to geometrical and technical special solutions on request.

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