Abstract:In order to determine the important hydraulic component hydraulic pumps and hydraulic motors types in the hydraulic driving system of high-power full hydraulic bulldozers, the parameters of the hydraulic driving system were calculated for a 565 kW full hydraulic bulldozer. Firstly, a hydraulic driving system structure with double-pump dual-motor in a single-sided loop was proposed. The system schematic diagram was established according to its power transmission route. Then based on the original design parameters of the 565 kW full hydraulic bulldozer, the resistance calculation method was adopted, the tangential traction force was determined under the condition of traction balance,and then the output torque and displacement of the motor were determined. Finally the HMV-02 series hydraulic motor with displacement of 280 mL/r and HPV-02 series hydraulic pump with displacement of 165 mL/r were selected, as the hydraulic components of the 565 kW hydraulic bulldozer.It is verified that the selected hydraulic components can meet the effective traction force design requirements of the full hydraulic bulldozer. It provides references for the research of other high-power engineering machinery hydraulic driving system.