The working failure of gear coupling and the design of drum gear coupling

　　The structure of the drum gear coupling is basically symmetrical.The two outer gear sleeves can be press-fitted or hot-fitted to the shaft head through a key connection.The tooth surface of the outer gear sleeve is arc-shaped teeth along the length direction, which is processed by the template using the profiling method.The teeth on the outer gear sleeve are drum-shaped teeth viewed from the direction of the tooth tip, and the thickness of the teeth gradually decreases from the center to both sides.The teeth on the inner ring gear that mesh with it are linear teeth.Because the tooth tip and tooth surface of the external gear sleeve are arc-shaped, the entire coupling is double articulated and flexible, so that it can adapt to the large deflection angle between the two axes. Oil lubrication or dry oil lubrication.The drum gear coupling has a compact structure, small size, weight, volume and moment of inertia, and all parts are round.The unbalanced moment is also small.
　　Common faults in the work of gear couplings:
　　①The internal and external tooth surfaces of the coupling are severely worn.
　　②The axial displacement of the inner gear ring of the coupling is large, and it can't even mesh.
　　③The internal and external teeth of the coupling are broken.
　　④The coupling bolts are broken.
　　The main reasons for the above failures are as follows:
　　   , Insufficient or lack of oil in the coupling of lifting accessories.Or improper use of grease causes calcification of the grease, resulting in the inability to lubricate between the tooth surfaces, or poor lubrication, resulting in serious tooth surface wear. In this case, just change the grease and inject qualified grease regularly to prevent oil leakage. The amount of oil is sufficient. Can be avoided.
　　   , The horizontality and coaxiality errors of the two shafts are too large, exceeding the range that the coupling can compensate, making the shaft teeth and the internal teeth meshing 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.