SSA, SSB,SSC-type Vibration Isolators

To optimize the selection of a vibration isolator one should consider:

  • device’s full mass
  • amount of points of support
  • load concentration on a point of support
  • rotational speed of spinning/rotating elements
  • fixing method to a mounted device

Collapsible spring vibration isolators selection and construction data tables.

Type of vibration isolator
SSA SSB SSC
pa pb pc
 

Size of a vibration isolator

 

Spring stiffness [kg/mm]

Maximum load  

Minimum natural frequency [Hz]

Minimum percentile effectiveness of vibration isolation at a specified driving frequency in [Hz] or [rpm]
axial load [kg] axial deflection[mm] 50 Hz 3000rpm 25 Hz 1500rpm 16,6 Hz 1000rpm 12,5 Hz 750rpm
1 A 0,76 38 50 2,25 99 99 98 96
1 B 1,22 48 40 2,54 99 98 97 95
1 C 2,01 76 38 2,59 99 98 97 95
1 D 4,50 135 30 2,91 99 98 96 94
1 E 6,18 154 25 3,19 99 98 96 93
2 A 1,23 61 50 2,26 99 99 98 96
2 B 2,15 86 40 2,52 99 98 97 95
2 C 3,36 127 38 2,59 99 98 97 95
2 D 7,44 223 30 2,91 99 98 96 94
2 E 9,82 245 25 3,19 99 98 96 93
3 A 1,61 80 50 2,26 99 99 98 96
3 B 3,26 130 40 2,52 99 98 97 95
3 C 5,99 227 38 2,59 99 98 97 95
3 D 12,44 373 30 2,91 99 98 96 94
3 E 15,81 395 25 3,18 99 98 96 93
4 A 2,49 124 50 2,26 99 99 98 96
4 B 4,38 175 40 2,52 99 98 97 95
4 C 8,26 313 38 2,57 99 98 97 95
4 D 16,62 498 30 2,91 99 98 96 94
4 E 28,66 716 25 3,18 99 98 96 93
5 A 5,02 251 50 2,25 99 99 98 96
5 B 9,58 383 40 2,52 99 98 97 95
5 C 12,13 460 38 2,58 99 98 97 95
5 D 24,99 749 30 2,91 99 98 96 94
5 E 41,31 1032 25 3,18 99 98 96 93
6 A 13,36 534 40 2,52 99 98 97 95
6 B 22,54 856 38 2,58 99 98 97 95
6 C 44,26 1327 30 2,91 99 98 96 94
6 D 66,91 1672 25 3,18 99 98 96 93
 

Size of a vibration isolator

 

Mass 1 pc. [kg]

Dimensions [mm] Fixing method
 

D

H*

Bushing** Socket
MxL [mm] Mxg [mm]
1 A,B,C,D,E 0,2 20 108 M8 x 30 M8 x 28
2 A,B,C,D,E 0,3 25 110 M10 x 30 M10 x 29
3 A,B,C,D,E 0,4 32 110 M12 x 50 M12 x 29
4 A,B,C,D,E 0,6 40 112 M16 x 50 M16 x 30
5 A,B,C,D,E 0,9 50 112 M16 x 50 M16 x 30
6 A,B 1,5 63 112 M16 x 50 M16 x 35
6 C,D 1,9 63 118 M20 x 50 M20 x 40
©All rights reserved.
* without load
** possibility of manufacturing a screw with a different thread M and length L.

 

Vibration isolator’s marking:
Collapsible spring vibration isolator SSA, SSB or SSX
SSA, SSB, SSC – X – type
X – size (1A – 6D)

Exemplary order:
Collapsible spring vibration isolator
SSB – 3A pcs
SSC – 6D pcs.

Load-deflection characteristics with natural vibrational frequencies of collapsible spring vibration isolators.

1 A, B, C, D, E 2 A, B, C, D, E
GS GS
3 A, B, C, D, E 4 A, B, C, D, E
GS GS
5 A, B, C, D, E 6 A, B, C, D
GS GS

Fixing of upper and lower guide bushings to a device’s support structure.

Guide bushing with a mandrel
Unthreaded hole Threaded hole
gb gb
Guide bushing with a socket
Unthreaded hole Threaded hole
gb gb
gb gb
collapsible spring Vibration Isolators
SSA SSB SSC
pa pb pc

Order of operations:

  1. lift a machine
  2. fix the upper guide bushing to the holes in a device’s base or support frame
  3. fix the lower guide bushing to the support structure – make sure that coaxiality is kept between the upper and lower guide bushings
  4. lay the compression springs on the lower guide bushing
  5. lower a device inserting the upper guide bushings in the compression springs