Your Benefits

The type RINGFEDER^® TND QCQ is a torsionally stiff, backlash-free steel disc coupling consisting of two hubs with open flange Q prepared to be equipped with shrink discs of the series RINGFEDER^® RfN 4061 and a compact-spacer C that can be installed and removed radially. Using high-strength screws, one disc pack each is connected to the spacer and one hub, thus achieving the function of a double-cardanic system.

Depending on the coupling size, two different disc packs are available:

• Type HD (= High Deflection) for increased compensation capability at occurring shaft misalignments.
• Type HT (= High Torque) with larger power density for higher requirements on transmissible torque.

The double-jointed design with two disc packs compensates for angular, axial and radial shaft misalignments with minimum axial space requirement. A permanently backlash-free fixation of the coupling hubs on the shafts to be connected is realized by means of high-quality RINGFEDER^® Shrink Discs.

Steel disc couplings of the RINGFEDER^® TND QCQ type are particularly convincing due to the following features:

• Completely backlash- and maintenance-free
• Highly effective compensation of angular, axial and radial shaft misalignment
• Torsionally rigid with high torsional stiffness
• Low restoring forces in case of shaft misalignment due to optimum disc pack design
• Minimum shaft distance for standard hubs
• Radially install- and removeable compact-spacer
• Simplified shrink disc selection thanks to RINGFEDER^® Shrink Discs specifically assigned per coupling size
• Bore diameter d_1/2 up to 70 mm (2.756 inch)
• Transmissible torque T_KN up to 1,750 Nm (1,290.73 ft·lb) / T_kmax up to 3,000 Nm (2,212.69 ft·lb)
• Rotational speeds depending on spacer length n_max up to 3,600 1/min
• Efficient realization of customer-specific solutions at short delivery times thanks to modular design

ATEX Compliance

For maximum safety in explosion-endangered areas, RINGFEDER^® Steel Disc Couplings can of course be supplied in compliance with ATEX according to Product Directive 2014/34/EU and DIN EN ISO 80079-36:2016 if required.

Main Areas of Use

• Pumps
• Fans
• Compressors
• Generator and Turbine Drives
• Axial and Radial Blowers
• Paper and Printing Machines
• Mixers and Stirrers
• Extruders
• Lifting and Traversing Gears
• Marine Drives
• Water Screw Drives

Technical Information

• The specified values for transmissible torques are valid as follows: Shaft tolerance h6 for shaft diameters up to 50 mm; Shaft tolerance g6 for shaft diameters from 50 mm; Surface quality R_a ≤ 3.2 μm.
• From a peripheral speed of 30 m/s, separate balancing of the individual coupling parts is recommended.
• Without further instructions on balancing, the coupling parts are balanced individually according to DIN 21940-11 in quality G 6,3 at 1,500 1/min. The hubs and the spacer are balanced without screwed-on disc packs.
• Screwing of disc packs via hexagon socket screws (coupling size 82-98).

Moreover, please observe the detailed selection and operating criteria in the documents Product Paper Steel Disc Couplings RINGFEDER^® TND and Tech Paper Steel Disc Couplings RINGFEDER^® TND QCQ.