The aim of the invention was to create, a high-performance, energy saving, hydraulic drive unit, which would excluded all or part of the existing shortcomings of modern hydraulic systems, among which are:
The requirement for an expansion tank, which increases the weight, volume, and price of the hydraulic system. The Oxidation of the working fluid (oil). Oil oxidation causes formation of resinous deposits, causing sticking (obliteration) within the flow area of the unit. Foaming of working fluid, with slight air ingress into the oil, it starts to foam, creating conditions favorable for the formation of air emulsions with very low density. This disturbs the uniformity of movement of the working parts . Reduces the viscosity of the working fluid, (foaming affects the viscosity of the oil and reduces the speed of the hydraulic equipment) Increasing the efficiency of hydraulic drive (In accordance with the laws of thermodynamics, when air bubbles compress, they are heated up and transfer heat to the hydraulic fluid. The hydraulic fluid transfers heat to the atmosphere, which as a result significantly lowers the efficiency of hydraulic drive. If there was no gas in the working fluid, the fluid will heat up less).Our invention: a hydraulic drive with a hermetically closed circulation system of the working fluid, solves these problems.