The drum gear coupling is composed of an inner gear ring with the same number of teeth and a flange half coupling with external gears.The external teeth are divided into straight teeth and drum teeth. The so-called drum teeth means that the external teeth are made into a spherical surface. The spherical surface is on the gear axis. The tooth side clearance is larger than that of ordinary gears. Drum-shaped gear couplings can be used. Allows a larger angular displacement (compared to the straight tooth coupling), which can improve the contact conditions of the teeth, increase the torque transmission capacity, and extend the service life.The contact state along the tooth width when there is angular displacement. Good lubrication is a necessary guarantee for the reliable operation of the drum gear coupling, and it also reduces wear.

　　Under the conditions of sufficient tooth root bending strength and tooth surface contact strength, the tooth width should be determined with a larger degree of overlap, and the tooth width should not be increased blindly to avoid unnecessary increase in the structural size.The general tooth width factor is 8-14.The width of the small tooth should be determined by the allowable root stress, and the width required for the displacement of the force point along the tooth width caused by the inclination between the shafts should also be considered.Gear couplings have small radial dimensions and large load-bearing capacity. They are often used for shafting transmissions under low-speed and heavy-duty conditions. High-precision and dynamically balanced gear couplings can be used for high-speed transmissions, such as gas turbine shafting. transmission.

　　An important way to increase the service life of drum gear couplings.The tooth width coefficient affects the tooth root bending strength and tooth surface contact strength of the tooth. The larger the tooth width coefficient, the greater the strength of these two items. The tooth width coefficient affects the coincidence degree. When the tooth width coefficient is less than a certain value, its value The increase of, has a greater impact on the increase of the coincidence degree, and when it is greater than this certain value, the increase of the device value has a smaller impact on the increase of the coincidence degree. For the drum-shaped gear coupling with the arc drum curve, the tooth width still determines the drum. The radius of the degree circle is also a parameter of the backlash. The larger the tooth width, the larger the radius of the bulge circle, and the larger the backlash required. Therefore, the following requirements are required: the smaller the gear tooth concentrated load, the better, and the tooth surface curvature It is proportional to the circumference of the drum, so the radius of the drum is as large as possible.The curvature radius of the bulge curve is proportional to the single-sided thinning of the internal tooth, so the bulge circle radius should be as large as possible.The radius of curvature of the bulge curve is proportional to the single-sided thinning of the internal tooth, that is, it is related to the meshing gap of the tooth. Insufficient thinning may cause interference, and excessive thinning will weaken the strength of the tooth, and the backlash will be large. .The drum-shaped tooth surface of the drum-shaped gear coupling improves the contact conditions of the inner and outer teeth, avoids the disadvantages of spur tooth end edge extrusion and stress concentration under angular displacement conditions, and at the same time improves tooth surface friction , Wear conditions, reduce noise, and long maintenance cycle.The tooth end of the outer gear sleeve is in the shape of a horn, which makes the assembly and disassembly of the inner and outer gears very convenient.