Experimental Study of Hydrostatic Transmission Type GST-90

Veselovska, Nataliia; Shargorodskiy, Serhiy; Yashchuk, Evgen; Hrechko, Roman

doi:10.37128/2520-6168-2022-1-7

Cited by 4 publications

(2 citation statements)

References 7 publications

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“…The most widespread in mobile self-propelled machines are rotary-piston volumetric hydraulic drives, their share is up to 30% of the total number [1,2]. An example of such a hydraulic drive is the hydrostatic transmission of the HGST-90 type, which belongs to axial-piston hydraulic machines.…”

Section: Analysis Of Recent Research and Publicationsmentioning

confidence: 99%

“…To date, the manufacturers of volumetric hydraulic drives are: in Ukraine, PrJSC «Hydrosila» (Kropivnytskyi), since 2009 -separated into a separate enterprise PrJSC «Hydrosila APM», «Sauer-Danfoss», «PSM-Hydroulics», Rexroth -Bosch Group (Germany), Kawasaki Precision Machinery (Japan), HIDRAULICA UMPLOPENI (Romania), EUROPARTS (Slovakia), etc. [1][2][3][4].…”

Section: Analysis Of Recent Research and Publicationsmentioning

confidence: 99%

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Study of the Trajectory of Movement of the Reduced Plunger Pressure Force on the Axial Piston Pump Cradle

Shargorodskiy,

Rutkevych,

Sharhorodska

2023

Engineering, Energy, Transport Aic

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Today, the hydraulic drive is increasingly used in agricultural machinery as motion drives, drives of working bodies, and drives of control systems. The power source of this type of drives is pumping stations based on piston-type pumps. This type of pump units has a number of advantages and disadvantages compared to gear pumps. The advantages include power, reliability, higher efficiency, the ability to smoothly regulate the flow of working fluid, and the disadvantages include increased requirements for the degree of purification of working fluids. The article reviews known hydraulic schemes of agricultural machines, analyzes them, and identifies their advantages and disadvantages. One of the elements of these hydraulic systems is the pump supply control system depending on the load on the working bodies of the hydraulic system elements. The correct choice of the parameters of the elements of this system has a significant impact on the quality of its work as a whole. In order to study the influence of system parameters, the structure and principle of operation of the system for regulating the supply of the working liquid of the axial-piston pump are described, the coordinates of the movement of the center of the reduced force from the action of the plunger pairs on the cradle of the control system for the supply of the working liquid are calculated. The trajectory of its movement along the plane of the feeding adjustment cradle is determined. The proposed dependencies make it possible to determine the magnitude of the moment acting on the cradle depending on the magnitude of the eccentricity. it was found that the point of application of the combined force to the end of the cradle moves along a loop-like trajectory, symmetrical to the axis, parallel to the axis of rotation of the cradle. At the same time, the magnitude of the moment of the combined force acting on the cradle has a cyclic nature, the periodicity of which is determined by the angle of rotation of the cylinder block by a value equal to the angular distance between adjacent cylinders. The frequency of fluctuations of the moment of the combined force when rotating the cylinder block of the PVC 1.63 pump with a frequency of 1500 rpm is 450 Hz, which requires the development of measures to eliminate their negative impact on the operation of the pump supply regulator. The moment of combined forces acting on the cradle from the side of the cylinder block depends on the pressure in the pump discharge line and the angle of rotation of the cylinder block. At a nominal pressure of 25 MPa, the range of fluctuations of the combined force moment acting on the PVC 1.63 pump cradle reaches 290 Nm. If the axes of the cylinder block and the trunnion of the cradle are in the same plane, the moment of combined forces acting on the cradle will change symmetrically relative to the axis of rotation of the cradle and periodically cause it to deviate in opposite directions. This nature of the load of the cradle interferes with the process of adjusting the angle of its inclination and, accordingly, the working volume of the pump. In order to reduce the negative impact of the moment of the combined force on the quality of the regulation of the supply of the working fluid of the PVC 1.63 pump, it is recommended to introduce a shift of the axis of rotation of the cradle relative to the axis of the cylinder block by 5 mm.

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Section: Analysis Of Recent Research and Publicationsmentioning

confidence: 99%

Section: Analysis Of Recent Research and Publicationsmentioning

confidence: 99%

Study of the Trajectory of Movement of the Reduced Plunger Pressure Force on the Axial Piston Pump Cradle

Shargorodskiy,

Rutkevych,

Sharhorodska

2023

Engineering, Energy, Transport Aic

Self Cite

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Development of the Mathematical Model of the Volume Hydrostatic Transmission HST-112 in the Braking Mode

Shargorodskiy,

Rutkevych

2023

Vibrations in Engineering and Technology

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Based on the analysis of modern designs of domestic and foreign agricultural machines, it was established that one of the most responsible systems that affect the operation and reliability of this equipment is the volumetric hydraulic drive. The hydraulic drive is also the most complex system of modern self-propelled machines, the use of hydrostatic transmission is a particular difficulty for operators HST-112, which is increasingly used on self-propelled machines and tractors. The article describes the structure and principle of operation of the volumetric hydrostatic transmission HST-112, and also presents its mathematical model in the braking mode of a self-propelled agricultural machine. The developed mathematical model makes it possible to understand and predict the operation of volumetric hydrostatic transmission under different conditions of load and pressure of the working fluid. The mathematical model takes into account the variable technological load acting on the working bodies of the volumetric hydrostatic transmission under different operating conditions of the self-propelled agricultural machine. The mathematical model of the HST-112 volumetric hydrostatic transmission as a part of a self-propelled agricultural machine was studied in the Mathcad software, which made it possible to understand what factors affect the efficiency of the transmission and how they can be optimized. As a result of the research of the mathematical model, the characteristic features of the work of the volumetric hydrostatic transmission HST-112 and its individual components in the presence of a significant inertial load were revealed. The mathematical model was developed on the basis of fundamental laws of hydraulics, hydromechanics, theoretical mechanics and real characteristics of drives of mobile agricultural machines. Based on the theoretical analysis of the processes that determine the characteristics of the hydrostatic transmission, it was established that with significant inertial loads on the executive hydraulic motor, processes occur that can lead to a decrease in its working life, wear resistance, and deterioration in reliability. The developed mathematical model calls for further experimental research in order to establish rational parameters of volumetric hydrostatic transmission.

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Study of the Braking Process of a Grain Harvester Using Volume Hydrotransmission GST-90

Rutkevych

Shargorodskiy

2023

Engineering, Energy, Transport Aic

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Based on the analysis of transmissions of modern grain and fodder harvesters "Don", "Niva", "Yenisei", "KSK", "John Deere", "Challenger", "New Holland", "Class", road construction and reclamation machines, it was found that they are mainly equipped with a volumetric hydraulic drive of the GST-90 type. According to the data of the scientific and technical literature, in the transmissions of modern equipment for the agro-industrial complex, these reasons account for at least 35 %, including the failure of hydrostatic transmissions of the GST-90 type accounts for 20 % of the total number of machine failures during the pre-repair period of operation. Therefore, the development of mathematical models and the research of the braking process of grain harvesters using volumetric of the GST-90 hydraulic transmission will allow to increase efficiency, reduce wear resistance and increase the resource of its operation. It was found that with the widespread use of hydrostatic transmissions in grain harvesters, little attention is paid to the issue of effective braking using this type of transmission. The main goal of the article is to study the operation of the hydrostatic transmission in the braking mode. The calculation scheme of the GST-90 hydrostatic transmission was developed and its mathematical model was developed, which adequately reflects the processes occurring in the hydraulic transmission of the grain harvester in braking mode. This mathematical model can also be used for conducting research in order to develop recommendations for the design and selection of optimal parameters of a hydraulic transmission of this type. The developed mathematical model calls for further theoretical and experimental research to develop measures to increase the quality indicators of its characteristics.

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Experimental Study of Hydrostatic Transmission Type GST-90

Cited by 4 publications

References 7 publications

Study of the Trajectory of Movement of the Reduced Plunger Pressure Force on the Axial Piston Pump Cradle

Study of the Trajectory of Movement of the Reduced Plunger Pressure Force on the Axial Piston Pump Cradle

Development of the Mathematical Model of the Volume Hydrostatic Transmission HST-112 in the Braking Mode

Study of the Braking Process of a Grain Harvester Using Volume Hydrotransmission GST-90

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