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Flexible workhorses with multiple connection options

02-10-2014 08:02 PM CET | Industry, Real Estate & Construction

Press release from: Ringfeder Power Transmission GmbH

RINGFEDER POWER TRANSMISSION's RING-flex multiple-disc couplings

RINGFEDER POWER TRANSMISSION's RING-flex multiple-disc couplings

Whether in test stands, pumps or machining centres – more and more users are relying on torsion-proof multiple-disc couplings for the backlash-free and precise transmission of torques; and for compensating for axial, lateral and angular misalignments. Differing industries also have quite different requirements regarding the components used. In order to meet these diverse requirements, RINGFEDER POWER TRANSMISSION offers a wide range of RING-flex multiple-disc couplings for use in diverse situations.

When developing the RING-flex multiple-disc couplings, RINGFEDER POWER TRANSMISSION not only attached high importance to typical parameters such as torsional stiffness and high true-running accuracy, but also to compact dimensions and multiple connection options. Depending on customer requirements, the hubs can be attached to the shafts by means of keys, clamping hubs, shrink discs or locking assemblies. All models are available as single or double Cardan types. For double Cardan couplings, in addition to the standard length, RINGFEDER POWER TRANSMISSION also offers a version with a short spacer. For special customer requirements, customized solutions with a freely determinable spacer length are also possible.

RING-flex couplings particularly prove their strengths in drives where the positioning accuracy in both directions is of high importance, e.g. in machines with frequent start/stop or reverse operation. Small manufacturing tolerances ensure a high level of true-running accuracy, enabling the use of the couplings even at high speeds and with irregular operating torques.

As usual, RINGFEDER POWER TRANSMISSION attaches great importance to high quality when it comes to the materials chosen. All RING-flex couplings are made of high-strength steel. The disc pack has been developed with the help of FEM analyses and is made of stainless spring steel. It is connected to the hubs by means of precise sleeves and highly resilient bolts. Per disc pack, a misalignment of up to 1° can be compensated. In addition to the 6-bolt-model, a version with 8 bolts is available for higher torque requirements. Two compact aluminium models are available for low to medium torques.

The couplings have proven successful even under harsh conditions thanks to their high power performance and temperature resistance. With nominal torques of up to 260,000 newton metres and shaft diameters of up to 250 millimetres, RING-flex multi-disc couplings cover a large range of applications. In addition, they can be used at temperatures of up to 240 degree Celsius, enabling their installation in high-temperature fluid pumps.

When installed horizontally, RING-flex multiple-disc couplings are also suitable for use in potentially explosive atmospheres. In accordance with EU Directive 94/9/EG (ATEX 95), the couplings in the HS, HD and HC series are complient with and classified as equipment in Group II, Categories 2G/2D. They are approved for use in zones G1, G2, D21 and D22.

More information about RINGFEDER POWER TRANSMISSION’s products is available online at

Contact within the company
Phone +49 6078 9385-0

Press contact
KNOEFLER – The Relations People
Benjamin Knöfler, Henning Klein
Phone +49 6022 26457-53

RINGFEDER POWER TRANSMISSION GMBH is one of the leading manufacturers of premium components in the fields of shock-absorbing and keyless connection technologies. The global player’s diversified range can be divided into three segments: under its GERWAH brand, the company from Groß-Umstadt in central Germany develops high-quality couplings for transmission systems and conveyor technology. The RINGFEDER product range boasts innovative locking devices, damping elements and customized solutions for individual power transmission needs. The ECOLOC brand includes cost-efficient alternatives from the premium range available for standard use. Thanks to international subsidiaries and representatives worldwide, customers around the globe benefit from the know-how of the RINGFEDER group. The national and international business of the company is run by CEO Thomas Moka.

Werner-Heisenberg-Straße 18
D-64823 Groß-Umstadt
Phone +49 6078 9385-0

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