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Metal Bellows Coupling EKN

GERWAH's 'EKN miniatur' is a backlash-free metal bellows coupling which boasts a very compact shape. The miniature coupling is connected to the shaft by means of radial set screws instead of a clamping hub. The element can be used in many different areas and displays all its advantages when misalignments between driver and driven components have to be compensated.

GERWAH® EKN

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metric inch
CAD Size L d1min d1max D1 T nmax ΔKa ΔKw ΔKr TA1
    mm mm mm mm Nm 1/min mm Grad mm Nm
  4 20 3 9 16 0,5 15000 0,2 1,2 0,1 0,5
  4 23 3 9 16 0,5 15000 0,3 2,0 0,15 0,5
  4 26 3 9 16 0,5 15000 0,4 2,0 0,2 0,5
  9 21 3 9 16 1,1 15000 0,2 1,2 0,1 0,5
  9 25 3 9 16 1,1 15000 0,3 2,0 0,15 0,5
  9 28 3 9 16 1,1 15000 0,4 2,0 0,2 0,5
  15 25 3 12 20 1,75 15000 0,25 1,2 0,1 1,5
  15 30 3 12 20 1,75 15000 0,4 2,0 0,15 1,5
  20 26 3 16 25 2,4 15000 0,3 1,2 0,1 1,5
  20 32 3 16 25 2,4 15000 0,4 2,0 0,2 1,5
  20 36 3 16 25 2,4 15000 0,5 2,0 0,25 1,5
  45 39 6 22 33 5,5 15000 0,3 1,2 0,1 3
  45 48 6 22 33 5,5 15000 0,5 2,0 0,2 3
  100 44 6 28 40 12 15000 0,4 1,2 0,15 3
  100 54 6 28 40 12 15000 0,5 2,0 0,25 3
Size L d1min d1max D1 T nmax ΔKa ΔKw ΔKr TA1
inch inch inch inch ft-lbs rpm inch degree inch ft-lbs
4 0.787 0.118 0.354 0.630 0.4 15000 0.008 1.2 0.004 0.37
4 0.906 0.118 0.354 0.630 0.4 15000 0.012 2.0 0.006 0.37
4 1.024 0.118 0.354 0.630 0.4 15000 0.016 2.0 0.008 0.37
9 0.827 0.118 0.354 0.630 0.8 15000 0.008 1.2 0.004 0.37
9 0.984 0.118 0.354 0.630 0.8 15000 0.012 2.0 0.006 0.37
9 1.102 0.118 0.354 0.630 0.8 15000 0.016 2.0 0.008 0.37
15 0.984 0.118 0.472 0.787 1.3 15000 0.010 1.2 0.004 1.11
15 1.181 0.118 0.472 0.787 1.3 15000 0.016 2.0 0.006 1.11
20 1.024 0.118 0.630 0.984 1.8 15000 0.012 1.2 0.004 1.11
20 1.260 0.118 0.630 0.984 1.8 15000 0.016 2.0 0.008 1.11
20 1.417 0.118 0.630 0.984 1.8 15000 0.020 2.0 0.010 1.11
45 1.535 0.236 0.866 1.299 4.1 15000 0.012 1.2 0.004 2.21
45 1.890 0.236 0.866 1.299 4.1 15000 0.020 2.0 0.008 2.21
100 1.732 0.236 1.102 1.575 8.9 15000 0.016 1.2 0.006 2.21
100 2.126 0.236 1.102 1.575 8.9 15000 0.020 2.0 0.010 2.21

Characteristics of Metal Bellows Couplings

  • Backlash-free transmission of torque
  • High torsional stiffness, precision of transmission of rotational angle
  • Different torsional stiffness
  • Compact design, low moment of inertia
  • Metal bellows made of stainless steel
  • Simple and safe assembly
  • Compensation of radial, axial and angular misalignment
  • Free of wear, maintenance-free, no downtimes
  • Not sensitive to temperatures between -30°C and +100°C
  • Nominal torques between 0,1 – 5000 Nm

Advantages

  • 100% inspection and traceability through individual marking
  • Higher torques at same dimensions
  • Compact design
  • Extended bore ranges
  • Customer-specific solutions
  • Higher safety in application, e.g. no wrong screw tightening torques

Backlash-free Metal Bellows Couplings are used in the sector of mechanical engineering, where a torque or a rotary motion has to be transmitted from shaft to shaft in highest accuracy of angle.


  • Pumps with axial and vertical drives
  • High dynamic portal drives
  • Spindle lifting units
  • Linear units
  • Packaging machines
  • Machine tools
  • Special machines

Series EKN


  • Miniature metal bellows coupling with radial set screws

Characteristics


  • Metal bellows made of stainless steel, hubs made of aluminum
  • The shaft tolerance should be within the fit tolerance “g6” or “h7”
  • The contact surfaces have to be free from oil and grease
  • Optional designs with keyway DIN 6885-1

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