German FETRA coupling FETRA model FETRA price

FETRA couplings transmit motion by welding or bonding a thin-walled corrugated tube (bellows) directly to the two coupling halves. This type of coupling features a simple structure, compact dimensions, ease of machining and installation, and high transmission accuracy. It is mainly used in low-power precision machinery and control mechanisms that require compact structures and high transmission accuracy. The coupling consists of two hubs and a thin-walled metal tube, connected by welding or bonding. Although many other materials are available, stainless steel and nickel are the most common materials for the metal tube. Nickel tubes are produced by electrodeposition. This method first involves machining a solid mandrel into a corrugated shape, electroplating nickel onto the mandrel, and then chemically dissolving the mandrel to obtain the nickel bellows. This method controls the precision of the bellows wall thickness and achieves thinner walls than other manufacturing methods. These thin-walled bellows give the coupling high sensitivity and rapid response, making it ideal for applications in extremely small and precise instruments.

FETRA coupling structure

Couplings have two main structural forms: (1) achieves shaft alignment using bolts in reamed holes and transmits torque through compression and shear on the bolt shanks; (2) achieves alignment by matching a shoulder on one coupling half with a groove on the other. The bolts connecting the two coupling halves can be standard bolts of grade A and grade B, with torque transmitted via friction between the mating surfaces of the coupling halves. Flange coupling materials can be gray cast iron or carbon steel; for heavy loads or circumferential speeds greater than 30 m/s, cast steel or forged steel should be used. Depending on the torque to be transmitted, all bolts on the flange can be fitted bolts for reamed holes, or half can be fitted bolts and the other half standard bolts.

FETRA coupling features

1) Misalignment compensation. Coupling misalignment compensation refers to the ability to compensate for relative displacement between two rotating components. Manufacturing and installation errors between connected components, temperature changes during operation, and load-induced deformation all impose requirements on misalignment compensation. This capability compensates for or mitigates additional loads on shafts, bearings, couplings, and other components caused by relative displacement between rotating components. 2) Damping. For applications with frequent loaded starts or varying working loads, the coupling must include elastic elements that provide buffering and vibration damping to protect the prime mover and driven machine from damage. 3) Safety and reliability, with sufficient strength and service life. 4) Simple structure, easy assembly, disassembly, and maintenance.

FETRA coupling selection

Selection of coupling type. When selecting a coupling type, consider the following factors. 1) The magnitude and nature of the torque to be transmitted, requirements for buffering and vibration damping, and the potential for resonance. 2) The degree of relative axial displacement caused by manufacturing and assembly errors, shaft loading, thermal expansion deformation, and relative motion between components. 3) Permissible overall dimensions and installation methods, including the operating space required for assembly, adjustment, and maintenance. For large couplings, disassembly and assembly should be possible without axial movement of the shaft. Additionally, consider working environment, service life, lubrication, sealing, and economic factors, and refer to the characteristics of various coupling types to select a suitable coupling.

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