Improvement of Manufacture Workability for Distribution Systems of Planetary Hydraulic Machines

Abstract

Planetary hydraulic machines are most often used in mechatronic hydraulic drives. The efficiency of the distribution system of a planetary hydraulic motor is provided by the manufacturability of its elements, in particular the distribution windows. To solve the problem of improving manufacture workability for the elements of the distribution system, the shape of the distributor and sleeve valve passages is substantiated. A design model, a mathematical apparatus, and a calculation algorithm were developed. They made it possible to investigate how changes in geometric parameters of a distribution system affect the throughput of a planetary hydraulic motor with passages embodied in the form of a circle. The initial data and initial conditions for the modeling of the distribution system operation with various kinematic diagrams were substantiated. The change in throughput according to kinematic diagrams of the distribution system was investigated. It was established that the increase in the number of working passages of the distributor caused the decrease of the distribution system flow area. The amplitude of the flow area oscillations decreased as well. When discharge passages of the distributor were used as additional working windows, the throughput of the distribution system increased. In that case, the amplitude of the area oscillations was reduced. The critical parameter which determined the operability of the distribution system was the oscillations of the flow area. Therefore, when the distribution systems for hydraulic motors were designed, it was recommended to use additional discharge windows as working passages.