Highly Flexible CouplingsRATO DS/DS+

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The high torque flexible Vulkan RATO DS and RATO DS+ couplings have been specially designed for use in installations requiring a high level of torsional flexibility and medium level of misalignment capacity. Supplementing the all-round marine engine couplings RATO S and RATO S+. The RATO DS / RATO DS+ couplings has been developed to offer an application-orientated coupling design. Specially for rigidly mounted ship´s main propulsion. The available stiffnesses enable a good tuning of the system with respect to both the transient and steady-state torsional vibration response. In the tradition of VULKAN Couplings, a backlash-free torque transmission is achieved.


  • Vulkan Rato DS and RATO DS+ marine couplings for high-performance elastomer of the ACOTEC sizes allows the use of a smaller size and thus offers a commercial benefit.
  • It is possible to provide a safety device against racing to protect the drive system
  • Maximum flexibility for the solution and a range of special design
  • The element design delivers torque transmission without any play. Optimal heat dissipation ensures functionality and availability of the drive system even under the harshest conditions
  • The compact dimensions of the torsionally flexible coupling ensure considerable weight reduction and therefore greater efficiency in the drive as well as lower project costs

Technical Data

  • Torque Range TKN [kNm]
    6.30 kNm - 160.00 kNm
  • Speed range [1/min]
    1,040.00 RPM - 2,100.00 RPM


Rigidly mounted engines