Reasons for the large axial displacement of the inner gear ring of the drum gear coupling:

       First of all, let us summarize the faults of drum gear couplings: ①The tooth surface is worn out. ②The axial displacement of the inner gear ring is large, and it can't even mesh. ③The phenomenon of broken teeth occurs. ④The bolts on the coupling are broken.

The main reasons for the above failures are as follows:
　　First, there is insufficient or lack of oil in the coupling of the lifting accessories.Or improper use of grease causes calcification of the grease, resulting in failure to lubricate between the tooth surfaces, or poor lubrication, resulting in serious tooth surface wear. In this case, replace the new grease and regularly inject qualified grease oil to prevent oil leakage. The amount of oil is sufficient. Can be avoided.
　　Second, the horizontality and coaxiality errors of the two shafts are too large, which exceeds the range that the coupling can compensate, which makes the shaft teeth and the internal teeth mesh incorrectly, causing local contact and additional torque.And this additional moment can be decomposed into axial force.Acting on the inner gear ring, the magnitude of this force depends on the size of the deviation, and is proportional to the deviation. The greater the deviation, the greater the force, which will cause the axial displacement of the inner gear ring of the lifting accessories coupling.If the displacement is too large, it will be uncontrollable, resulting in serious gear wear and even broken teeth. The internal and external teeth cannot be meshed until they cannot be transmitted.It is difficult to deal with this kind of fault, and it needs to stop production.That is to realign, or realign the side of the reducer, or realign the side of the reel.First find out the part with large offset error, so first measure the side of the coupling that is offset, that is, measure the levelness and coaxiality of the main shaft and the level and coaxiality of the reducer main shaft, and then press the quality again. Standard copy leveling and leveling can eliminate the fault.For example, the author has discovered such failures on site. The hoist is a JK-2/5 single-rope winding hoist. At that time, the concentricity deviation of the coupling was measured to be 11n, and the reducer side was low, resulting in lifting The accessory coupling cannot work, and the axial displacement of the inner gear ring exceeds the tooth width. After surveying and calculating, the reducer should be re-calibrated according to the quality standard. After adjustment, it runs normally and the fault is eliminated.In addition, the horizontality and concentricity of the two shafts have a large error, which causes the coupling to rotate in a different way.The reason for the wear of the coupling gear of the lifting accessories 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 is the main reason.This kind of reason mostly occurs when the level difference between the left and right of the reducer main shaft is large.Furthermore, bolts with small diameters, insufficient strength, or poor bolt materials can also cause bolts to break.

In recent years, the development trend of transmission coupling technology and application has the following points:
One is the comprehensive analysis and matching with the host and load.For example, engineering machinery, vehicles, and ship power transmission all require systematic analysis of the characteristics of the transmission coupling and the mechanical characteristics of the engine and load, so as to make the best choice of the transmission coupling.
The second is the continuous improvement of the quality requirements for transmission couplings, which greatly increases the requirements for raw materials, processing and assembly processes, product processes and final inspection.