The Flexible Coupling has simple structure, small number of parts, small radial size, no lubrication, and high compression bearing capacity of elastic elements. When replacing elastic elements, it is necessary to move the half coupling axially. This coupling has the ability to compensate for the relative deviation of two shafts. The elastic part of the Flexible Coupling is sheared during operation, and its workability is extremely poor. It is suitable for medium speed transmission shafting with very low requirements, but not for working conditions with high performance requirements; The pin in the shaft is in shear and extrusion state when working, and its strength condition is the shear strength on the cross section of the elastic pin and the extrusion strength between the pin and the pin hole wall.
The Flexible Coupling uses a number of pins made of non-metallic materials, which are placed in the mating hole between the two halves of the coupling and the inner surface of the outer ring, to realize the connection of the two halves of the coupling by transmitting torque through the pins. Flexible Coupling has the ability of cushioning and vibration reduction. In the process of mechanical transmission, the load transmitted by the transmission shaft system often changes; In order to avoid resonance, the change frequency of periodic load should be staggered from the natural frequency of transmission shafting by changing the change frequency of periodic load or changing the change frequency of shafting. Flexible Coupling needs to simplify the mechanical model of the moment of inertia and stiffness of the active and driven sides of the coupling in the transmission shaft system.
Generally, the purpose of avoiding resonance is to change the natural frequency of the shafting, while changing the natural frequency of the shafting is to change the rotational inertia or stiffness of the shafting. The rotational inertia is related to the mechanical structure, which is difficult to achieve by changing the rotational inertia, while the stiffness of the shafting is easy to change. Therefore, the purpose of changing the Flexible Coupling is to change the stiffness of the shafting to avoid resonance. Flexible Couplings generally have the functions of cushioning and vibration absorption, but Flexible Couplings with relative stiffness can not produce the effect of vibration reduction under any variable torque, sometimes it will cause more intense vibration.
When the rigidity of the coupling is coordinated with other parameters and loads of the whole transmission shaft system, the effect of vibration reduction can be produced. When selecting the coupling, the speed of the transmission shaft, the load, the installation degree of the two parts connected, the working speed of the coupling and the centrifugal force caused shall be considered. Two equivalent discs are arranged on both sides of the coupling. In the flange hole of the coupling halves, to realize the connection of the coupling halves. The elastic element has the ability of micro-compensating the offset of the two axes, and is placed in the mating hole between the two halves of the coupling and the inner surface of the outer ring. The coupling of the two halves is realized by transmitting torque.
