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Friction Springs Industrial Buffer

RINGFEDER Friction Springs can also be supplied in customized buffer versions.

RINGFEDER® Friction Springs Industrial Buffer

metric inch
Size Type Fv F s W L D DB Gw b db Remark
kN kN mm J mm mm mm kg mm mm
1 06300 6 54 27 820 202 112 150 10 100 18
2 06300 6 54 37 1100 262 112 150 12 100 18
3 06300 6 54 55 1640 374 112 150 17 100 18
4 06300 6 54 64 1900 434 112 150 19 100 18
5 06300 6 54 74 2200 494 112 150 20 100 18
6 08000 7 83 33 1500 230 122 200 13 110 18
7 08000 7 83 46 2050 306 122 200 16 110 18
8 08000 7 83 66 2950 428 122 200 23 110 18
9 08000 7 83 79 3550 505 122 200 26 110 18
10 08000 7 83 92 4150 582 122 200 28 110 18
11 10000 10 125 45 3000 300 142 250 22 130 23
12 10000 10 125 61 4100 397 142 250 26 130 23
13 10000 10 125 89 6000 571 142 250 37 130 23
14 10000 10 125 105 7050 667 142 250 42 130 23
15 10000 10 125 121 8150 763 142 250 45 130 23
16 12400 20 200 51 5600 366 178 250 39 155 23
17 12400 20 200 65 7150 454 178 250 45 155 23
18 12400 20 200 102 11200 696 178 250 64 155 23
19 12400 20 200 116 12800 784 178 250 75 155 23
20 12400 20 200 130 14300 872 178 250 78 155 23
21 16600 10 350 75 13900 500 235 370 85 200 27
22 16600 10 350 95 17500 630 235 370 105 200 27
23 16600 10 350 140 25900 880 235 370 145 200 27
24 16600 10 350 165 30500 1040 235 370 160 200 27
25 16600 10 350 190 35000 1200 235 370 165 200 27
27 19600 20 600 105 32000 620 - 153 - 26 Buffer plate:
450x340
Größe/Size Typ Fv F s W L D DB Gw b db Remark
lbs lbs inch ft-lbs inch inch inch lbs inch inch
1 06300 1,348 12,136 1.063 605 7.953 4.409 5.906 22.05 3.937 0.709
2 06300 1,348 12,136 1.457 811 10.315 4.409 5.906 26.46 3.937 0.709
3 06300 1,348 12,136 2.165 1,210 14.724 4.409 5.906 37.48 3.937 0.709
4 06300 1,348 12,136 2.520 1,401 17.087 4.409 5.906 41.89 3.937 0.709
5 06300 1,348 12,136 2.913 1,623 19.449 4.409 5.906 44.09 3.937 0.709
6 08000 1,573 18,653 1.299 1,106 9.055 4.803 7.874 28.66 4.331 0.709
7 08000 1,573 18,653 1.811 1,512 12.047 4.803 7.874 35.27 4.331 0.709
8 08000 1,573 18,653 2.598 2,176 16.850 4.803 7.874 50.71 4.331 0.709
9 08000 1,573 18,653 3.110 2,618 19.882 4.803 7.874 57.32 4.331 0.709
10 08000 1,573 18,653 3.622 3,061 22.913 4.803 7.874 61.73 4.331 0.709
11 10000 2,247 28,092 1.772 2,213 11.811 5.591 9.843 48.50 5.118 0.906
12 10000 2,247 28,092 2.402 3,024 15.630 5.591 9.843 57.32 5.118 0.906
13 10000 2,247 28,092 3.504 4,425 22.480 5.591 9.843 81.57 5.118 0.906
14 10000 2,247 28,092 4.134 5,200 26.260 5.591 9.843 92.59 5.118 0.906
15 10000 2,247 28,092 4.764 6,011 30.039 5.591 9.843 99.21 5.118 0.906
16 12400 4,495 44,947 2.008 4,130 14.409 7.008 9.843 85.98 6.102 0.906
17 12400 4,495 44,947 2.559 5,274 17.874 7.008 9.843 99.21 6.102 0.906
18 12400 4,495 44,947 4.016 8,261 27.402 7.008 9.843 141.10 6.102 0.906
19 12400 4,495 44,947 4.567 9,441 30.866 7.008 9.843 165.35 6.102 0.906
20 12400 4,495 44,947 5.118 10,547 34.331 7.008 9.843 171.96 6.102 0.906
21 16600 2,247 78,658 2.953 10,252 19.685 9.252 14.567 187.39 7.874 1.063
22 16600 2,247 78,658 3.740 12,907 24.803 9.252 14.567 231.49 7.874 1.063
23 16600 2,247 78,658 5.512 19,103 34.646 9.252 14.567 319.67 7.874 1.063
24 16600 2,247 78,658 6.496 22,496 40.945 9.252 14.567 352.74 7.874 1.063
25 16600 2,247 78,658 7.480 25,815 47.244 9.252 14.567 363.76 7.874 1.063
27 19600 4,495 134,842 4.134 23,602 24.409 0.000 0.000 337.31 0.000 1.024 Buffer plate:
450x340

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.

Friction springs RINGFEDER® 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 Friction Springs RINGFEDER® 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 Spring 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 Friction Spring RINGFEDER® applies for all operating conditions. In contrast to other Damping systems, Friction Springs RINGFEDER® 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 Friction Springs RINGFEDER®, however remain independent of these factors and can be used in the temperature range of -40 ° to +80 °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: Aswell 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 Friction Springs RINGFEDER®

  • Pretensioning: Friction Springs RINGFEDER® 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 Friction Springs RINGFEDER® some form of guiding is necessary (D2 and d2 in the preceding table). 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: Friction Springs RINGFEDER® 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, 18 we recommend to use gaiters.

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