The gear coupling is developed on the basis of the straight gear coupling to meet the technical requirements of large inclination, variable inclination, small size and high reliability. Compared with the straight gear coupling, this coupling can compensate the radial axial Angle and its comprehensive displacement between the two axes, and the transmission torque range is large, the allowable speed is also high. Ship lifting transportation and other mechanical equipment has been more and more widely used.

The gear coupling is mainly produced by digesting and absorbing the introduced technology and using the method of mapping and imitation for single or small batch production. The result is that the design theory is not complete, the design data is not complete, the manufacturing technology is also relatively backward, resulting in poor product performance. At present, the drum gear coupling on some important mechanical equipment in China still relies on imports. Therefore, it has important academic and economic benefits to carry out theoretical research and technical development of drum tooth coupling to form a series of new drum tooth coupling products with international level. The inner tooth ring should be moved back and forth in the whole stroke when the tooth is lapping, so that the whole straight tooth part can be ground. Because the tooth type keyless coupling design takes into account the error of the position of the two axes in the shaft pair and the error that may be caused by the change of the position of the two axes when the unit is running from cold state to hot state.