MALMEDIE Drum coupling

As a connection between rope drum and gearbox, our Drum-Couplings can transmit high torques with small dimensions and weights.

The MALMEDIE Drum-Coupling type TTXL is a further development of the RTT, NTT, TTX and TTXs versions, which have been proven successful over many years.

The new development exhibits an increase in capacity, accompanied by significantly improved operating security and also meets with customers demands for higher capacities smaller weights and installation space. The connection dimensions ensure the possibility to replace former types.The transmission of force within the drumcoupling takes place through positive locking. Hardened barrel rollers, placed in the holes formed by the two circular gearings, are used as force transmitting elements. The barrel rollers are driven axially. The cover and housing, combined with the seals, prevent both the ingress of foreign bodies and the leakage of lubricant. The torque is transmitted to the rope drum via the flattenings on the outer diameter of the coupling housing and via the friction between the coupling housing and the flanged wheel.

An automatic wear indicator is available as an option.


Fields of application

  • Hoists
  • Winches
  • Conveyor Belts


  • Suitable for radial forces and torque transmissions.
  • Increased operational safety by advanced internal design.
  • A pointer fixed to the outer cover, and a corresponding milled mark on the coupling hub allow external control on the wear and the axial position of the coupling housing in relation to the coupling hub. It is not necessary to dismantle the coupling for this purpose.
  • As an option for the series TTXL, an automatic wear control (Malmedie patent) is available. With this option, a gearbox-mounted proximity switch gives a signal (e.g. to the crane PLC) at 80% wear. The automatic wear control can be also retrofitted on the TTXL series.
  • Drum couplings TT

    Drum couplings TT

    The TT series of drum couplings have been specifically designed for lower capacity hoist applications.

  • Drum couplings TTXL

    Drum couplings TTXL

    The TTXL is the classic design of Drum-Coupligs. Manufactured from forged rings, the TTXL guarantees high performance and improved operational safety by its internal design.

  • Drum couplings MTTXL

    Drum couplings MTTXL

    The MTTXL is a compact version of the TTXL with a shorter hub, ideal for applications with limited mounting space. Manufactured from forged rings, also the MTTXL guarantees high performance and improved operational safety by its internal design.

  • Snag Overload System (SOS)

    Snag Overload System (SOS)

    Das Snag Overload System (SOS) ist eine Überlastsicherung für Container Krane und verhindert die Gefahr vor Strukturschäden am Kran, die vom Hubwerksmotor aufgrund seiner hohen Schwungmasse ausgehen.

Superior features

  • Economic efficiency with high performance
  • Higher load capacity compared to the competition
  • High permissible torque with small installation space
  • Increased permissible radial load
  • Large permissible finished bore
  • Long service life
  • Interchangeability with previous series
  • Optionally with automatic wear indicator
  • Suitable for use in potentially explosive atmospheres according to RL 94/9/EG.

Wear control

The existing wear in the drum coupling can be read off from the displacement of the pointer in relation to the wear notch. Here, a signal (e.g. to the crane control) is emitted via a sensor attached to the gearbox at approx. 80% wear. The max. permissible wear values are given in the table (see catalogue download). After exceeding the limit value, the drum coupling must be replaced. For applications with two load directions, the max. permissible wear values must be halved. This must be stated in the order so that the corresponding wear notch can be manufactured.

The automatic wear control can be also retrofitted on the TTXL series.

Design and calculation

We would be happy to support you in selecting the coupling. Information on assembly, disassembly and the technical data can also be found in our catalog for download.

Flohr Industrietechnik GmbH - Im Unteren Tal 1 - D-79761 Waldshut-Tiengen - Phone: +49 (0)7751 / 8731-0 -

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