ANALYSIS OF VOLUMETRIC REGULATION OF HYDRAULIC PUMPS IN HYDROSTATIC SYSTEMS

The paper presents the results of the conducted researches related to the analysis of the parameters of the drive system, the crawler hydraulic excavator, with hydraulic pumps with collective regulation according to the criterion of constant hydraulic power and the regulator of ideal hyperbolic characteristics. A crawler excavator weighing 16,000 kg with a three-member manipulator with boom, arm and bucket with a volume of 0.6 m3 was tested. The paper discusses the principles of volumetric regulation of hydrostatic systems, which is achieved by changing the specific flow rate of the hydraulic pumps. For pumps with constant specific flow rates, regulation is performed by reducing the flow through the hydraulic motors, which increases the pressure in the pump's delivery line and is controlled by a safety valve. This method, however, can lead to oil heating and energy loss. In contrast, pumps with variable specific flow rates use modular regulators that adjust the pump's characteristics based on system parameters, ensuring efficient operation under varying load conditions. The study's findings indicate that the use of hydraulic pumps with combined power regulation and an ideal hyperbolic characteristic regulator allows for the maintenance of constant hydraulic power even with changing loads. This regulation method ensures efficient use of the engine's power and prevents motor overload, enhancing the overall performance and longevity of the excavator. The research underscores the significance of proper hydraulic pump regulation in achieving optimal machine efficiency and durability.