Slowing down moving masses in a quick, safe and precise manner: RINGFEDER® Friction Springs are indispensible safety components in all technology and industry sectors where suddenly occurring forces have to be taken up and kinetic energy absorbed, or where damping systems are required with relatively compact dimensions while also being able to sustain enormous forces. They consist of precisely manufactured outer and inner rings which are assembled to complete spring columns according to the individual requirements of the user. These are 100 % tested and loaded several times before delivery, which guarantees absolute functional reliability – whether as proven standard or highly specific custom-made designs.

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Technical Data

* A stroke limitation has to be provided for marked types

CAD
Typ
Typ alt
F
kN
se
mm
We
Joule
he
mm
D1.
mm
d1
mm
b/2
mm
D2G
mm
d2G
mm
Gwe
kg
Bemerkung
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 Keine Blockfeder, Hubbegrenzung vorsehen
19600 1318 600 4,4 1320,0 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 1584,0 26,4 220,0 174,0 22,0 225,0 169,0 2,573
26200 1320 860 4,8 2064,0 25,8 262,0 208,0 21,0 268,0 202,0 3,415
30000 1221 1000 5,8 2900,0 35,8 300,0 250,0 30,0 306,0 245,0 5,510
32000 1222 1200 6,2 3720,0 38,2 320,0 263,0 32,0 326,0 258,0 7,060
35000 1223 1400 6,6 4620,0 41,6 350,0 288,0 35,0 356,0 283,0 9,180
40000 1224 1800 7,6 6840,0 47,6 400,0 330,0 40,0 407,0 324,0 13,560
CAD Typ
 		Typ alt
 		F
lbs 		se
inch 		We
ft-lbs 		he
inch 		D1.
inch 		d1
inch 		b/2
inch 		D2G
inch 		d2G
inch 		Gwe
lbs 		Bemerkung
  01800 1201 1124 0.016 0.74 0.087 0.713 0.567 0.071 0.74 0.55 0.004
  02500 1202 2023 0.024 1.99 0.122 0.984 0.819 0.098 1.02 0.79 0.009
  03200 1203 3146 0.031 4.13 0.157 1.260 1.063 0.126 1.30 1.03 0.015
  03800 1204 4495 0.035 6.64 0.185 1.496 1.248 0.150 1.55 1.20 0.026
  04200 1205 5843 0.039 9.59 0.205 1.661 1.362 0.165 1.72 1.31 0.040
  04800 1206 7641 0.043 13.79 0.232 1.898 1.551 0.189 1.96 1.50 0.057
  05500 1207 8989 0.051 19.18 0.268 2.165 1.811 0.217 2.23 1.75 0.077
  06300 1208 12136 0.055 27.88 0.303 2.480 2.043 0.248 2.56 1.98 0.123
  07000 1209 14608 0.063 38.35 0.339 2.756 2.291 0.276 2.84 2.22 0.163
  08000 1310 18653 0.071 55.32 0.386 3.150 2.638 0.315 3.27 2.52 0.231
  09000 1311 22474 0.079 73.76 0.433 3.543 2.972 0.354 3.66 2.87 0.320
  10000 1312 28092 0.087 101.78 0.480 3.937 3.307 0.394 4.06 3.19 0.448
  12400 1314 44947 0.102 191.77 0.591 4.882 4.016 0.488 5.04 3.86 0.899
  13000 1313 35958 0.102 153.41 0.591 5.118 4.390 0.488 5.28 4.25 0.829
  14000 1315 56184 0.118 276.59 0.669 5.512 4.567 0.551 5.67 4.41 1.252
  16600 1316 78658 0.146 477.95 0.787 6.535 5.276 0.630 6.69 5.12 1.916 A stroke limitation has to be provided
  19600 1318 134842 0.173 973.59 0.921 7.638 6.102 0.748 7.83 5.91 3.695
  20000 1317 114616 0.154 733.88 0.882 7.795 6.378 0.728 7.99 6.18 3.461
  22000 1319 161811 0.173 1168.31 1.039 8.661 6.850 0.866 8.86 6.65 5.672
  26200 1320 193274 0.189 1522.34 1.016 10.315 8.189 0.827 10.55 7.95 7.529
  30000 1221 224737 0.228 2138.95 1.409 11.811 9.843 1.181 12.05 9.65 12.147
  32000 1222 269684 0.244 2743.76 1.504 12.598 10.354 1.260 12.83 10.16 15.565
  35000 1223 314632 0.260 3407.57 1.638 13.780 11.339 1.378 14.02 11.14 20.238
  40000 1224 404527 0.299 5044.98 1.874 15.748 12.992 1.575 16.02 12.76 29.895

Images & Drawings

Weight utilization Weight utilization
Force-travel diagram Force-travel diagram
Parallel arrangement Parallel arrangement
Serial arrangement Serial arrangement
Force-travel diagram Force-travel diagram
Dimensions Dimensions
Hole pattern Hole pattern
Design 1 Design 1
Design 2 Design 2
Design 3 Design 3

Product Characteristics

Your Benefits

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 °C 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.
  • Versatility in design – As well as the standard RINGFEDER® Friction Spring range we can offer special solutions based on you specific application. The graph 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 Springs allows an optimum utilisation of the available mounting space due to a nested construction, using parallel or series spring arrangements.

 

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.

 

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.

Buffers With RINGFEDER® Friction Springs

The buffer types are standard delivered in one of four 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 For geometrical and technical special solutions according to specific requirements Please contact our engineering team.

RINGFEDER® Friction Springs – Functionality Of A Friction Spring
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RINGFEDER® Friction Springs – Functionality Of A Friction Spring

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Product Paper RINGFEDER® Damping Technology

Product Paper RINGFEDER® Damping Technology

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Instruction Manual RINGFEDER® Friction Springs

Instruction Manual RINGFEDER® Friction Springs

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