Сhuiko V. The development of operating characteristics of linear motion volumetric hydraulic drives included to the hydraulic units by means of uneven pump flow compensation

The thesis solves an important scientific and practical task, namely the improvement of operating characteristics of linear motion volumetric hydraulic drives included to the hydraulic units. The present thesis focuses on the alternative method investigation of controlled motion of hydraulic drive output link while fluctuating pump flow for the case when traditional fluctuation suppression methods are not reasonable to use. The current problem is solved by the conception of uneven pump flow compensation by means of the variable displacement hydraulic throttle application in the drain line of the hydraulic unit. The paper specifies basic mathematical relations that are united in a mathematical model of hydraulic unit for longitudinal stud deformation when mounting with pump body parts. On the basis of the mathematical model defined pressure and discharge parameters in the cavity of the hydraulic unit; when providing them the motion of the hydraulic drive output link is even. The new construction of controlled hydraulic throttle has been created. By experimental and theoretical studies confirmed viability of the proposed method, which improves the fluidity of the output level of the hydraulic drive. The adequacy of the the mathematical model is confirmed.The recommendations as for the suggested method application and definition of hydraulic unit elements parameters are given in the present thesis.