Computation and structural methods to expand feed channels in planetary hydraulic machines

Planetary Rotor Hydraulic Machines (PRHM) with wave-shaped central gearwheels and floating satellites show notable engineering performance, at the same time, this subject lack in-depth study. A methodology of computing cross-sections of feed channels that supply power fluid has been devised to embrace a variety of modifications of planetary hydraulic machines. Design formulas have been proposed, and a comparative assessment has been performed related to the channel cross-section criterion. Locating channels in the sun gearwheel (having a lesser number of waves M) contributes to expanding channels. In the cases when channels are in the epicyclic gearwheel (N being the wave number), the following configurations MxN have been discovered as preferential: 6x8; 4x6; 2x4. A design concept to expand channel cross-sections by means of sequentially joining two PRHM stages of the same type has been studied. This concept is more efficient in the cases when configurations have the same number M = N and their sun gearwheel and epicycle are related as 2x2; 3x3.