Engineers and designers are always looking for solutions to make their and our life easier. Especially in our times, which are characterized by high cost pressure and ever more ambitious applications, flexible components are in high demand. Compact, high-performance strong components that allow for simple constructive solutions can play an important role. Flender meets these requirements with its N‑Arpex all-steel multi-disc coupling. The successor to the proven Arpex couplings is a compact coupling solution offering torques up to 2 million Newton meters.
Installation – easy as ABC
The N‑Arpex series of all-steel lamina couplings is now completed with standard couplings in two versions (ARN‑8 and ARN-10) , thereby delivering up to 2 million Nm of torque . Through the eight or ten screw connections, coupling diameter of up to 988 mm can be reached. For higher torques expansion stages Flender developed a conical screw connection. Thus, assembly is significantly simplified even in high performance ranges and can be carried out without additional tools.
The torsionally rigid, all-steel, multi-disc coupling offers a compact overall design, a significant increase in performance and increased bore capacity. This allows a smaller coupling to offer a higher torque transfer, compared with the previous model Arpex. In many cases this allows for the application of a smaller sized coupling. The achieved weight optimization enables higher, physical parameters and leads to a reduction of the bearing load in the connected machines. In combination with the closed flange contour, these couplings can be used for peripheral speeds of up to 110 m per second.
One series fits all
A single series of 37 sizes covers the entire torque range up to two million Nm, the previous model needed 67 designs to offer that torque range. This makes the coupling selection easier, clearer and faster, which has a positive impact on the order process and procurement logistics.
The entire value chain, from development over production to the performance test on a test beds, is done in-house by Flender, with decades of experience in development and construction flowing into each coupling.
The devil is in the detail
In the various sectors, machines and systems are subject to a wide variety of standards and certifications. The materials, used in conjunction with the well-thought-out overall design of the N‑Arpex couplings, enable the application in a temperature range from ‑50 to 280°C. The couplings are also suitable for explosive environments and meet the requirements of the Atex Directive 2014/34 / EU and the requirements of API 610 / ISO 13709 and API 671 / ISO 10441. Another standard safety feature of the series is the special catching device securing the intermediate spacer in the event of plate breakage
The redesign of the couplings provides an even higher bore capacity allowing for bigger shafts, in comparison to its predecessor. Another focus of development was on the simple installation of the couplings, which are available in three- and five-part versions. The two hub pieces at both ends are provided with pull-off threaded holes. In the case of the five-part variant, the intermediate unit is also delivered pre-assembled. All these features simplify handling and allow quick and safe installation routines.
From mechanics into the digital world
In addition to the design benefits, users profit from the electronic capabilities offered by Flender. Couplinges or gearboxes can be selected in the online tool “Drive Technology Configurator” based on the technical parameters appropriate to their application.
The tool allows designers to find the right coupling and order it online. Flender can also provide key design data such as 3D models, dimensional drawings and descriptions. By integrating these into suitable design and simulation programs, a “digital twin” can be created. This gives designers important information about suitable couplings and drives early in the project phase.
Although couplings are not among the most expensive parts in the drive train, designers expect optimal value for money and the best possible design characteristics that meet the most stringent standards. The N‑Arpex coupling generation has been developed meet these requirements, following in the footsteps of the very popular Arpex series, while setting new benchmarks at the same time.
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