TNM G elastomer jaw couplings
Three-piece design for radial replacement of the flexible intermediate ring.
A robust three-piece design that offers flexibility and easy separation for a wide range of industrial applications
Three-piece jaw coupling
The RINGFEDER TNM G coupling is an extremely flexible and robust jaw coupling with a three-piece design. It has been specially developed 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.
The flexible intermediate ring is responsible for several important functions. Not only can it dampen shocks and torsional vibrations effectively; it is also oil-resistant and electrically conductive, properties that are highly beneficial in many industrial applications.
A special feature of the RINGFEDER TNM G coupling is that each coupling half is divided into two parts, making it possible to separate the coupled machines with ease. When the claw ring is pushed back, it is even possible to check the drive’s direction of rotation. Similarly, a coupling half can be lifted radially out of the connection together with its unit. Another advantage is that the flexible intermediate ring can be replaced without having to move the machines axially.
The RINGFEDER TNM G coupling is extremely versatile and can be used in any direction of rotation and any mounting position – further highlighting its adaptability to different areas of application.
RINGFEDER TNM G
Three-piece design for changing the flexible intermediate ring 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 (three-piece versions)
- Bores up to 280 mm
- Torques up to TKn = 41,000 Nm / TKmax = 97,500 Nm
- Speeds up to nmax = 5000 rpm
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 is a nitrile butadiene rubber (NBR) with a hardness of 72 Shore A.
Pb 82 is a nitrile butadiene rubber (NBR) with a hardness of 82 Shore A.
It is the Shore hardness of the individual elastomer materials under compressive stress 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 (Annex X).
