Your Benefits

The type RINGFEDER^® TND VDV is a torsionally stiff, backlash-free steel disc coupling consisting of two inverted hubs V, connected by a spacer D in standardized length. 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 radial (adjustable via the spacer length), angular and axial shaft misalignments. By utilizing the standard spacers, the largest possible disc pack distance and thus the largest possible radial misalignment is realized at minimum distance of the shafts to be connected.

Steel disc couplings of the RINGFEDER^® TND VDV 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
• Bridging of large shaft distances by means of spacers in various standard lengths
• Maximum radial misalignment at minimum shaft distance
• Bore diameter d_1/2 up to 120 mm (4.724 inch)
• Transmissible torque T_KN up to 44,000 Nm (32,452.73 ft·lb) / T_kmax up to 77,000 Nm (56,792.29 ft·lb)
• Rotational speeds depending on spacer length n_max up to 12,200 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

• Without further specifications, we deliver as standard: Bore tolerance H7; Keyway acc. to DIN 6885-1; Keyway width tolerance P9.
• 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 are balanced half key (before grooving), the spacer without screwed-on disc packs.
• Screwing of disc packs via hexagon socket screws (coupling size 47-141) or hexagon head screws (coupling size 169-254).

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 VDV.