Analysis of the type and balance performance of plum coupling

The plum blossom coupling is a widely used coupling, also called a claw coupling, which is composed of two metal claw discs and an elastic body.The two metal claws are generally made of 45 gauge steel, but aluminum alloys are also useful when load sensitivity is required.

Plum coupling elastomers are generally composed of engineering plastics or rubber.The life of the coupling is also the life of the elastic.Since elasticity is under compression, it is obviously under tension.Generally, the life of the elastic body is 10 years. Because the elasticity has the function of buffering and damping, it is used more in the occasion of strong vibration.The performance temperature of the elastomer determines the operating temperature of the coupling, which is generally -35 to +80 degrees.

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 is evolved on the basis of the straight claw type, but the difference is that its design can be suitable for the application of the servo system, and it 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 sleeves on both sides, thereby achieving 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, otherwise the plum elastic spacer will be squashed and deformed and lose its elasticity, and the preload will disappear, resulting in loss The zero-gap performance may be discovered by users only after serious problems occur.

The plum coupling has a good balance performance and is suitable for high-speed applications, but it cannot handle large deviations, especially axial deviations.Larger eccentricity and deflection angle will produce a larger bearing load than other servo couplings.