The selection of coupling and the selection method of plum blossom coupling

　　The selection standard of the coupling is based on: When choosing a coupling, the designer should first choose from the couplings that have been formulated as standards, mechanical industry standards, and patented couplings, only in the existing standard couplings and patented couplings It is necessary to design the coupling by yourself when the design needs cannot be met.
　　The transmission accuracy of the coupling: small torque and the transmission of the main shaft system requires the coupling to have high transmission accuracy, and a flexible coupling with non-metal elastic elements should be used.The shafting transmission with large torque and power transmission has no requirements for transmission accuracy. At high speeds, flexible couplings with metal elastic elements, elastic couplings and the gap between the movable elements should be avoided, and transmission accuracy should be selected. High diaphragm coupling.
　　Selection method of plum coupling:
　　There are two main types of plum blossom couplings, one is the traditional straight claw type, and the other is the curved (concave) claw type zero-backlash coupling.The traditional straight-jaw plum blossom coupling is not suitable for use in high-precision servo transmission applications.The zero-backlash claw type plum blossom coupling evolved on the basis of the straight claw type, but the difference is that its design can be adapted to the application of the servo system, and is often used to connect servo motors, stepping motors and ball screws.The curved surface is to reduce the deformation of the elastic plum spacer and limit the influence of centripetal force on it during high-speed operation.The zero-clearance claw coupling is composed of two metal sleeves (usually made of aluminum alloy, stainless steel can also be provided) and a plum blossom elastic spacer.The plum blossom elastic spacer has multiple leaf branches. Like a slider coupling, it also squeezes the plum blossom elastic spacer and the shaft sleeves on both sides to ensure its zero clearance performance.Different from the slider coupling, the plum blossom coupling is driven by squeezing while the slider coupling is driven by shear.When using a zero-clearance claw coupling, the user should pay attention not to exceed the large bearing capacity of the elastic element given by the manufacturer (under the premise of ensuring zero clearance), otherwise the plum elastic spacer will be squashed and deformed and lose its elasticity , The preload disappears, resulting in the loss of zero-gap performance, and users may only find out after serious problems occur.