| The structure of 2K-V planetary gear drive, force analysis on the winch bearings and force analysis on the cycloid gears are briefly introduced at the beginning of the thesis.Furthermore, a dynamic model of 2K-V planetary gear drive with N planets is formulated by lump-parameter method. The model admits three planar degrees of freedom for each of the sun, planets, winches, cycloid gears and carrier. And stiffness, such as component bearings, gear meshing interactions and torsional stiffness of the shafts and winches, are considered. Applied the parameters of 2K-V6 planetary gear drive to the model, the natural frequencies and vibration modes are investigated, and the results reveal that the vibration modes can be classified into two cases: torsional vibration modes of central components and transversal ones. The first frequency is 134.2 Hz, much smaller than the others, and it mainly affects the carrier's torsional vibration. On the other hand, this conclusion is verified by an experiment that shows the first frequency is 126.8Hz. Further analysis indicates the stiffness of the bearings in the carrier give the greatest influence upon the frequency. Considering the torsional vibration only, another dynamic model with 5 degrees of freedom is established by lumped-parameter method. Based on the model, the nature frequency of first order is evaluated and analyzed. And the result agrees with the former.At the end, the transmission efficiency is evaluated and analyzed, and the result shows that the efficiency is fairly good. |
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