TNM H elastomer jaw couplings
Version with multi-piece coupling hubs and a radially removeable intermediate sleeve.
Easily accessible pump coupling with direction of rotation check
Pump coupling with multi-piece coupling hubs
The RINGFEDER TNM H coupling is an extremely versatile and reliable jaw coupling that has been specially developed for pump drives. It is distinguished by its torsional flexibility and the option of a removable spacer. This coupling makes it possible to compensate for angular, radial and axial shaft misalignments within defined tolerance ranges.
The torque is transmitted via elastic buffers that are under compressive stress, made of synthetic rubber (Pb), and are interconnected in an intermediate ring. This flexible intermediate ring plays a crucial role because of its ability to dampen shocks and torsional vibrations effectively. It is also oil-resistant and electrically conductive, properties that are highly beneficial in many applications.
A special feature of the RINGFEDER TNM H coupling is that both coupling halves are divided into two parts. This design enables easy radial installation and removal of the intermediate sleeve. The clearance between the flange hubs allows the flexible intermediate ring to be replaced or the bearing block of a centrifugal pump to be removed without having to move the motor. With the intermediate sleeve removed, it is also easy to check the drive’s direction of rotation.
The RINGFEDER TNM H coupling is extremely flexible and can be used in any direction of rotation and any mounting position – further highlighting its adaptability to different pump applications.
Multi-piece design, for removing the intermediate sleeves. Removal of a pump impeller without having to move the connected units axially. Flexible intermediate ring in various hardnesses: standard Pb72, hard Pb82.
Benefits
- Torsionally flexible, compensates for angular, radial and axial shaft misalignment
- Intermediate rings subjected to compressive stress
- Elastomers available in various degrees of Shore hardness, suitable for temperatures from -30°C to +100°C
- Flexible ring can be changed without moving the connected units (multi-piece versions)
INTRODUCTION
The RINGFEDER TNM torsionally flexible coupling is free to move in all directions. As a result, shaft misalignments on the machines to be connected can be compensated in the angular, radial and axial directions. Misalignments can be caused, for example, by assembly inaccuracies, movements or settling.
Avoid torsional vibration
Thanks to the torsional flexibility of these products, dangerous torsional vibrations can be shifted from the operating range of machinery to other speed ranges where no negative effects are to be expected. The flexible intermediate rings are made from a material with a high damping capacity. As a result, the couplings are able to keep resonance increases in check when passing through problematic speed ranges, thereby protecting the coupled machines from damage. The couplings also attenuate torque shocks and – thanks to the damping capacity of the material – allow a vibration system excited by a shock to stabilise very quickly. The transmission of structure-borne sound is prevented.
Elastomer materials
Synthetic rubbers are used as the base materials for the flexible elements of the TNM coupling. They are usually electrically conductive, thereby preventing unwanted static charges, etc. Two different material hardnesses are available for the flexible elements of the RINGFEDER TNM as standard.
Pb 72 – nitrile butadiene rubber (NBR) with a hardness of 72 Shore A.
Pb 82 – nitrile butadiene rubber (NBR) with a hardness of 82 Shore A.
It is the Shore hardness of the individual elastomer materials that determines their load-bearing capacity. From the level of these values, it is possible to infer what torques can be transmitted by the coupling and its spring stiffness. For further details, see the technical data sheet.
Ambient conditions
The elastomer materials used are suitable for an ambient temperature range of -30°C to +100°C. For higher ambient temperatures, please get in touch. The following design guidelines provide a detailed explanation of how the temperature affects the choice of coupling size. The coupling is only to be operated in normal industrial air. Aggressive media can corrode coupling components, screws and flexible elements, thereby posing a risk to the functional safety of the coupling. The coupling can be declared compliant with European (ATEX) Directive 2014/34/EU.
