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Plum coupling selection method
2021-11-18 10:51:25

There are two main types of plum couplings, one is the traditional straight claw type, and the other is a curved (concave) claw type zero gap coupling. Traditional straight-claw plum couplings are not suitable for use in high precision servo drive applications. The zero clearance claw type plum coupling is based on the straight claw type, but the difference is that it is suitable for servo system applications, and is often used to connect servo motors, stepping motors and ball screws. The surface is designed to reduce the deformation of the elastic plum spacer and to limit the effect of centripetal force on it during high speed operation. The zero clearance jaw coupling is a combination of two metal bushings (usually made of aluminum or stainless steel) and a plum elastic spacer. The plum elastic spacer has a plurality of blade branches. Like the slider coupling, it is also pressed to make the plum elastic spacer and the sleeves on both sides match, thereby ensuring zero gap performance. Unlike the slider coupling, the plum coupling is driven by compression and the slider coupling is driven by shear. When using a zero clearance claw type coupling, the user must pay attention not to exceed the maximum bearing capacity of the elastic element given by the manufacturer (under the premise of zero clearance), otherwise the plum elastic spacer will be lost by flattening deformation. Elasticity, preloading disappears, resulting in loss of zero-gap performance, and may be discovered by users after serious problems occur.

The plum coupling has excellent balance performance and is suitable for high speed applications (up to 30,000 rpm), but does not handle large deviations, especially axial deviations. Larger eccentricities and yaw angles result in larger bearing loads than other servo couplings. Another concern with the value is the failure of the plum coupling. Once the plum elastic spacer is damaged or fails, the torque transmission is not interrupted, and the metal claws of the two bushings mesh together to continue transmitting torque, which is likely to cause problems in the system. Choosing the right plum elastic spacer material according to the actual application is a big advantage of this coupling. Some automation equipment companies can provide plum blossom spacers of various elastic materials, different hardness and temperature tolerance, so that customers can choose the right materials. Meet the performance standards of practical applications.