Any coupling between the coupling and the drive shaft belongs to an interference fit, so when the coupling is disassembled and assembled, it will be difficult to disassemble, which has spent a lot of time and has a certain impact on production.
The problem with claw couplings is that the claws will break. What is the reason for this situation?How to prohibit this situation?The roughness of the coupling jaws processed by some coupling factories is relatively high. When the coupling is in operation, fatigue cracks will appear. The smaller the roughness value, the better the fatigue resistance of the coupling. It is Ra3.2.
The coupling claw and the elastic body are not in a clearance-free fit, which will cause a large impact when the coupling is in the reverse idle stroke.As usual, the matching clearance between the coupling and the elastic body is below 0.3mm.
The tool quality of the claw coupling for pumps should be ductile iron, which is better than cast steel. Cast steel has high strength and is sensitive to stress convergence.The higher the strength limit, the greater the stress confluence sensitivity, and the pin vibration performance of ductile cast iron is better, and its mechanical performance (strength, elasticity, plasticity) is second only to cast steel.
In addition, the arc transition value between the claw and the root of the coupling is very small, and some even have a sharp angle of 90 degrees, which will make the coupling easily form a stress confluence. When the coupling is impregnated by the impact force, it will be very Easily lead to fatigue cracks in the coupling.We can increase the transition fillet at the root of the claw and change it to R10 arc transition.To deal with this problem.
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