Збірник наукових праць

DOI: https://doi.org/10.32515/2664-262X.2023.8(39).2.3-10

Functional portrait of a gear hydraulic machine

Mykhailo Pidhaietskyii, Kyryl Shcherbyna, Andrii Kyrychenko, Viktor Hodorodozha, Tetiana Dzhus

About the Authors

Mykhailo Pidhaietskyii, Associate Professor, PhD in Technics (Candidate of Technics Sciences), Central Ukraіnian National Technical University, Kropyvnytskyi, Ukraine, ORCID ID: 0000-0002-1633-4924

Kyryl Shcherbyna, Associate Professor, PhD in Technics (Candidate of Technics Sciences), Central Ukraіnian National Technical University, Kropyvnytskyi, Ukraine, e-mail: kir2912s@ukr.net , ORCID ID: 0000-0002-1665-7686

Andrii Kyrychenko, Professor, Doctor in Technics (Doctor of Technic Sciences), Central Ukraіnian National Technical University, Kropyvnytskyi, Ukraine, e-mail: amkyrychenko@gmail.com, ORCID ID: 0000-0002-4335-9588

Viktor Hodorodozha, рost-graduate, Central Ukraіnian National Technical University, Kropyvnytskyi, Ukraine

Tetiana Dzhus, master student, Central Ukraіnian National Technical University, Kropyvnytskyi, Ukraine

Abstract

Increasing the efficiency of the functional performance of various mechanisms, including hydraulic gear pumps and motors, is one of the most important issues in the development of mechanical engineering. Special attention should be paid to the indicators of the volume flow rate and the torque. One of the ways is to study the mutual influence of the output parameters of the hydraulic gear machine. Some of the main parameters that determine the functional performance of a gear hydraulic machine are volume flow, power and torque, which in turn form the overall efficiency. It is necessary to create a functional portrait in order to determine the influence of these indicators on the overall efficiency and to improve the efficiency of the gear hydraulic machine. The resulting functional portrait will make it possible to determine the indicator for optimizing the operation of a gear hydraulic machine, both in pump mode and in motor mode. In turn, it will allow us to combine correlations with each other. In order to obtain the optimal indicators for building a functional portrait, a scheme for diagnosing a gear hydraulic machine in the pump-motor mode has been developed. An algorithm for its operation has been presented. As a result of the construction of a functional diagram of a gear hydraulic machine in pump mode, it was found that its operation has no inertia and its parameters are stable and dependent on the dimensional diagram. The orientation of the end bearings occurs during operation in pumping mode under frictional, sliding and dynamic conditions, which ensures improved sealing. On the other hand, the functional portrait of a gear hydraulic machine in motor mode has a zone of inertia, which can be stable or not, depending on the starting moment. Also, on the basis of the obtained functional portrait, it can be assumed that the probable cause of the failure of the gear pump and the motor during the acceptance tests may be the insufficient study of their interdependencies at the stage of development of the design documentation.

Keywords

functional portrait, gear pump, gear motor, displacement, total efficiency

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References

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