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Metal Bellows Coupling PKN

GERWAH's 'PKN' unites the tried and tested technical advantages of a metal bellows coupling and a plug-in connection. These elements do not need any axial initial load due to tightening and thus allow for easy mounting and disassembly. The PKN series is the perfect choice when power has to be transmitted from shaft to shaft with the greatest possible angular accuracy.

GERWAH® PKN

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metric inch
CAD Size L d1min d1max D1 H T nmax ΔKa ΔKw ΔKr TA1
    mm mm mm mm mm Nm 1/min mm Grad mm Nm
  2 39,0 3 14 25 28 2,4 22900 0,4 1,2 0,2 1,5
  4,5 47,5 6 17 33 35 5,5 17600 0,3 1,2 0,1 3
  10 53,5 6 24 40 42 12 14100 0,4 1,2 0,15 3
  18 70,5 8 26 45 48 22 12700 0,5 1,5 0,2 6
  30 72,0 10 30 55 56 36 10200 0,4 1 0,1 12
  60 88,5 10 35 66 67 75 8600 0,4 1 0,1 30
  80 102,5 14 42 80 85 95 6800 0,4 1 0,2 60
  150 102,5 14 42 80 85 180 6800 0,4 1 0,2 85
Size L d1min d1max D1 H T nmax ΔKa ΔKw ΔKr TA1
inch inch inch inch inch ft-lbs rpm inch degree inch ft-lbs
2 1.535 0.118 0.551 0.984 1.102 1.8 22900 0.016 1.2 0.008 1.1
4.5 1.870 0.236 0.669 1.299 1.378 4.1 17600 0.012 1.2 0.004 2.2
10 2.106 0.236 0.945 1.575 1.654 9 14100 0.016 1.2 0.006 2.2
18 2.776 0.315 1.024 1.772 1.890 16 12700 0.020 1.5 0.008 4.4
30 2.835 0.394 1.181 2.165 2.205 27 10200 0.016 1.0 0.004 9
60 3.484 0.394 1.378 2.598 2.638 55 8600 0.016 1.0 0.004 22
80 4.035 0.551 1.654 3.150 3.346 70 6800 0.016 1.0 0.008 44
150 4.035 0.551 1.654 3.150 3.346 133 6800 0.016 1.0 0.008 63

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 PKN


  • Metal bellows coupling with pluggable clamping hub

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
  • Optional special design in stainless steel

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