The coupling can absorb the vibration

At present, the commonly used rigid coupling has flange coupling, cross slider coupling, tooth coupling and roller coupling, etc., these couplings have the advantages of simple structure, low manufacturing cost, can transfer larger torque, often used for low speed, no impact, load is relatively smooth or impact is slight occasions. But these couplings in the use of many shortcomings, such as flange couplings, because of its no buffering and damping, also can not compensate for axial and radial deviation, when the neutral requirements of the two axes is very high and there is a relative displacement, will cause additional load in the parts, so that the work of deterioration.

Because the protruding teeth of the cross slider coupling can slide in the groove, the relative displacement between the two shafts can be compensated during installation and operation. However, in the case of relative displacement between the two shafts, the middle disc will produce a great centrifugal force, which increases the dynamic load and wear, and because of its inelastic elements, it can not play a buffer.

Gear coupling can transfer a lot of torque, and allow a large offset, the accuracy of the installation is not high; But the quality is larger, the cost is higher, suitable for heavy machinery. The characteristics of the roller coupling are simple structure, compact size, small mass, convenient assembly and disassembly, easy maintenance, compensation performance and buffering performance, but because of the gap between the sleeve of the chain and its phase accessories, it is not suitable for reverse transmission and start frequent transmission. At the same time, it is not suitable for high-speed transmission because of centrifugal force.

The early flexible removable coupling in use was the single film plate coupling. Because of its elastic elements which can produce large elastic deformation and damping effect, the relative displacement between the two connected axes can be compensated by elastic deformation. It can also play the role of vibration absorption and adapt to the fluctuation of load. It is a kind of metal flexible coupling with relatively high performance. It does not need to moisten oil, has high strength and compact structure, and is suitable for shaft transmission under high speed, high temperature and corrosive medium conditions.

But because this coupling does not contain the middle section, the buffer capacity is small, and the instantaneous torque of the coupling when it starts is very large, which will impact the membrane disk. And this kind of coupling adopts the traditional key and keyway structure to transfer torque with the shaft, which will produce large stress concentration because of the keyway, thus weakening the strength of the shaft and the semi-coupling and limiting the transmission of large torque. At the same time, the traditional keyway connection is interference connection, which brings great inconvenience to the coupling when it is installed or needs maintenance and disassembly, and the accuracy and processing cost are high.

Now most of the elastic couplings are made of aluminum alloy, of course, there are also stainless steel elastic couplings. Stainless steel elastic coupling in addition to corrosion resistance, but also increased the torque bearing capacity and rigidity, and even can reach two times of similar products made of aluminum alloy. However, this increase in torque and rigidity is offset by the increase in mass and inertia. Sometimes the disadvantages outweigh the advantages, and the disadvantages of this connection make it necessary to find a practical connection.

Based on the above consideration, this topic for the keyway connection structure of the defects in conventional coupling, and can't compensate the axial and Angle to the problem of insufficient deviation, designed and developed a new kind of coupling, using the finite element analysis software, the coupling design by numerical simulation and structure optimization, and coupling life estimation of main components.