German Spieth coupling Spieth model Spieth price

Spieth couplings utilize their mechanism characteristics to enable continuous rotation of the connected shafts and reliably transmit torque and motion, even when the two shafts are not on the same axis and an axis angle exists. The greatest feature of universal couplings is their large angular compensation capability, compact structure, and high transmission efficiency. The angle between the two shaft axes varies with different structural types of universal couplings, generally ranging from 5° to 45°.

Spieth coupling structure

There are two main structural forms for couplings: (1) alignment of the two shafts is achieved using bolts in reamed holes, and torque is transmitted by the bolt shank withstanding compression and shear; (2) alignment is achieved by the fit between a shoulder on one half-coupling and a groove on the other. The bolts connecting the two half-couplings can be standard bolts of grade A and grade B, with torque transmitted via the frictional moment at the mating surfaces of the two half-couplings. Flange coupling materials can be gray cast iron or carbon steel; cast steel or forged steel should be used for heavy loads or when the circumferential speed exceeds 30 m/s. Depending on the magnitude of the transmitted torque, all bolts on the flange can be bolts for reamed holes, or half can be bolts for reamed holes and the other half standard bolts.

Spieth coupling features

1) Misalignment compensation. The misalignment compensation of a coupling refers to its ability to compensate for the 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 alleviates additional loads on the shafts, bearings, couplings, and other components caused by relative displacement between rotating components. 2) Damping. For applications involving 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 to assemble, disassemble, and maintain.

Spieth coupling selection

Coupling type selection: When selecting a coupling type, consider the following items. 1) The magnitude and nature of the torque to be transmitted, requirements for buffering and vibration damping functions, and the potential for resonance. 2) The degree of relative displacement between the two shaft axes caused by manufacturing and assembly errors, shaft loading, thermal expansion deformation, and relative motion between components. 3) Permissible outer dimensions and installation methods, including the necessary operating space 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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