Model analysis and verification of 2K-H planetary gear system:

The planetary gear system is the important part of the cutting unit in a coal shearer, and its performance is directly related to the output efficiency in coal mines. Analyzing the natural frequencies and vibration modes of a planetary gear system in a coal shearer is helpful for designing and monitoring the planetary gear system. So a lateral-torsional coupled free vibration model is proposed with the shaft stiffness of the sun gear based on the analysis of a purely torsional model. The solutions are determined by using the modal superposition method. Taking the planetary gear system in the cutting unit of a YBCS2-400 type coal shearer as an example and studying the natural characteristics, the vibration modes of the undamped system could be classified into three types – rotational mode, translational mode and planet mode. The associated reduced-order eigenvalue for each type of vibration mode is derived and the analytical expression of natural frequency is presented for the planet mode. The established ...