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What the failures does custom coupling have?
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What the failures does custom coupling have?

Views:0     Author:Site Editor     Publish Time: 2021-04-11      Origin:Site

Custom coupling is a special design for the abnormal machines, which is one type of shaft couplings. Therefore, custom automobile coupling has the same features of shaft couplings. As the core part of the machine, the machine does not work once the custom coupling is damaged though it is small. Therefore, it is important for us to know the failures that happen to it and how to maintain custom coupling.


  • What the failures does custom coupling have?

  • How to change custom coupling?

  • How to maintain custom coupling?


What the failures does custom coupling have?

Balance level: The balance level of any custom coupling component is determined according to the square root of the possible value of the eccentricity of the center of gravity between the main axis of inertia of the coupling and the axis of rotation. The imbalance is expressed in microns.

Due to various reasons, the center of mass or inertial principal axis of the coupling does not coincide with the axis of rotation, and the phenomenon of unbalanced centrifugal inertial force, centrifugal inertial couple force and dynamic deflection will occur during operation, which is called rotor imbalance phenomenon.

This imbalance phenomenon will inevitably cause the vibration of the shaft system, thereby affecting the normal operation and service life of the machine, so it is important to pay attention to it.

Relative displacement: The two shafts connected by the custom coupling produce relative displacement due to many factors such as manufacturing error, installation error, deformation caused by shaft load, base deformation, bearing wear, temperature change, and relative movement between components.

Under normal circumstances, the relative displacement of the two shafts is difficult to avoid, but the displacement direction generated by the shafting transmission under different working conditions, that is, the axial, radial, angular and displacement magnitudes are different.

Only the flexible coupling has the performance of compensating the relative displacement of the two shafts, so a large number of flexible couplings are selected in practical applications. Rigid couplings do not have compensation performance and their application range is limited, so the amount used is small.

  • Severe wear on the tooth surface of the custom coupling

  • The axial displacement of the gear ring of the custom coupling is large, and it cannot even be matched

  • The custom coupling has broken teeth

  • The custom coupling bolt is broken.


How to change custom coupling?

Since the structure of various custom couplings is not the same, we should make some marks on the positions of the custom coupling components before disassembling the custom coupling for reference during reassembly. For custom couplings used in high-speed machines, the connecting bolts are weighed, and the markings must be clear without mistakes.

When disassembling the custom coupling, generally disassemble the connecting bolt first. Because a layer of grease, corrosion products and other deposits are deposited on the surface of the thread, the bolt is not easy to disassemble, especially for the heavily corroded bolt. The disassembly of the connecting bolts should be done with suitable tools because the external or internal hexagonal bearing surface of the bolt has been slipped and damaged, which makes disassembly more difficult.

For bolts that have been rusted or have a lot of grease, solvents are often used to spray the joints of the bolts and nuts to allow the solvent to penetrate into the threads, which will be easy to disassemble. If the bolts cannot be removed, the heating method can be used to enlarge the gap between the nut and the bolt so that the rust is also easy to fall off. But the heating temperature is generally controlled below 200°C. If none of the above methods work, only damage the bolts, and replace them with new bolts during assembly. The new bolts must be consistent with the original bolt specifications.

In the process of custom shaft coupling disassembly, the difficult task is to remove the hub from the shaft. For the hub of the coupling, a three-legged puller or a four-legged puller is generally used for disassembly. The selected puller should match the outer dimensions of the hub, and the right-angle hooks of each leg of the puller should be properly combined with the rear side of the hub, so that no slippage will occur when you apply force. This method is only used for disassembly of hubs with relatively small interference. For hubs with relatively large interference, heating methods are often used, or at the same time with hydraulic jacks for disassembly.


How to maintain custom coupling?

Replace with new grease and inject qualified grease regularly to prevent oil leakage and sufficient oil.

Re-align, or re-align the gear reducer side, or re-align the reel side. First find out the part with large offset error, measure which side of the custom coupling is offset, that is, measure the levelness of the main custom coupling, and re-calibrate according to the quality.

In addition, the horizontality and concentricity of the two shafts have large errors, which causes the custom coupling to be awkward when rolling. The reason for the gear wear of the above-mentioned lifting fitting custom coupling is basically similar. In addition to the normal force, the connecting bolt is also subjected to additional bending moment, which causes it to break. This kind of reason mostly occurs when the level difference between the left and right sides of the reducer main shaft is large. Furthermore, bolts with small diameters, insufficient strength, or poor quality of bolt materials can also cause bolts to break.


Learn more something about custom alloy industrial couplings can know the common errors of custom couplings and how to maintain custom couplings. If you want to buy good custom couplings with reasonable price, FOSHAN HOUZHE TRANSMISSION EQUIPMENT CO., LTD. is your best choice. We have all types of different shaft couplings and if you want to have other type of shaft coupling, you can contact us.




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