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Torsionally rigid all-steel couplings ARPEX series

  • Информационные материалы

    Информационные материалы

    ARPEX couplings have proved themselves for over 30 years in all areas of technology where reliable, maintenance-free torque transmission is required. ARPEX couplings link machine shafts and compensate for shaft misalignments, while generating only low restorative forces. Thanks to the use of spring steel plates and backlash-free screw connections, ARPEX couplings are torsionally rigid and backlash-free. All ARPEX coupling components are manufactured from high-quality steel. Robust, compact construction guaranteeing a high level of operational reliability and a long service life is therefore possible. High-precision production ensures that at speed in the assembled condition only low forces act on the machine parts connected to them. ARPEX couplings can be used for both directions of rotation and are thus also suitable for reverse operation.

    ARPEX couplings are not subject to wear and, if correctly designed, assembled and installed, can be expected to have an unlimited service life. With most types the intermediate spacer can be fitted radially without having to move the driving and driven machines.

    Thanks to a large number of standard components ARPEX couplings can be combined to make many different types. In this way, standard types can be used with many drives.

    ARPEX couplings can withstand temperatures between –40 °C and +280 °C in operation. On request, they can also be specially equipped for use in other temperature ranges.

    ARPEX coupling optionally suitable for potentially explosive environments. Complies with Directive 94/9/EC for:

    II 2G T2/T3/T4/T5/T6

    –40 °C ≤ Ta ≤ +230 °C/+150 °C/+85 °C/+50 °C/35 °C

    II 2D T 120 °C –40 °C ≤ Ta ≤ +70 °C

    I M2

    To meet the high quality demands made of ARPEX couplings, the development and manufacture of ARPEX couplings is integrated into a certified quality management system in accordance with the requirements of DIN EN ISO 9001.

    Type approval for use of ARPEX couplings in shipbuilding has been issued by the following classification societies: American Bureau of Shipping (ABS), Det Norske Veritas (DNV), Germanischer Lloyd (GL) and Lloyd's Register of Shipping. Product certification to GOST-R for the Russian market has already been obtained.


    ARPEX couplings are manufactured completely from steel. Torque is transmitted by means of torsionally rigid, flexible plates. The plates are held together by a sleeve and ring to form a compact plate pack. This ensures easy, operationally safe installation. Two plate packs fastened alternately to the flanges permit compensation of shaft misalignments in an angular, radial and axial direction. On coupling types with a single plate pack only angular and axial misalignments are possible.


    All coupling parts like hubs, spacers and flanges are manufactured from high-grade steel; the plates are made from stainless, hard-rolled CrNi spring steel. Bolts and nuts are of quality 10.9 or 10.


    ARPEX couplings are available as a catalog standard from 92 Nm to 1450000 Nm and are divided into various series. Because of this series diversity, ARPEX couplings meet most torque and speed requirements as a universal coupling solution in general mechanical engineering. The individual series and their corresponding possible applications are described in full in the following sections.

    Plate pack

    The flexible elements in an ARPEX coupling take the form of plate packs. The individual, thin plates are held together by a socket and ring to form a compact plate pack. The picture below shows the structure of a ring plate pack.

    Plate pack screw connection
    Features of plate pack screw connection

    Up to bolt size M22, the plate pack screw connection on ARPEX couplings is in the form of a close-fitting bolt connection. After that the patented conical screw connection is used. The decisive advantage of this screw connection is considerably simplified fitting. The use of an hydraulic fitting tool is no longer necessary. All sizes can be fitted with a torque wrench.

    A further feature of the conical screw connection is the genuine positive connection resulting in high centering accuracy and, thus, a high balancing quality. Material: High-grade quenched and tempered steel.

    The conical screw connection is used for the following coupling sizes:

    ARS-6 series: size 305-6 to 602-6

    ARC-8/-10 series: all sizes

    ARP-6 series: type NAN, size 325-6; type MCECM, size 310 and 345-6

    ARW-4/-6 series: size 324-4 to 880-6