Abstract
Axial piston pumps with high rotational speeds are required in many fields to increase the power-to-weight ratio. However, three main sliding friction pairs in the pump restrict the increase in rotational speed. To solve this problem, we propose a 2D piston pump with a balanced force that contains a sliding friction pair. Firstly, the mechanical structure and working principle of the pump are described. Then, the pump volumetric efficiency is studied by mathematical modeling, and volumetric losses containing backflow and leakage are analyzed and discussed from the perspectives of load pressure and rotational speed. A test bench that verifies the mathematical model is built to measure the volumetric efficiency of the tested pump. We have found that the increase in rotational speed can help to increase the pump volumetric efficiency, and the mathematical model is consistent with the tested data for 1000 rpm but demonstrates a remarkable difference from the tested data for 3000 rpm. Thus, the temperature field of the pump and the viscosity-temperature characteristics of the oil must be taken into account to increase volumetric efficiency further.
Highlights
Hydraulic systems are widely used in many fields because of their high power density, quick dynamic response, and strong load capacity [1,2,3]
The leakage of the 2D piston pump with a balanced force is composed of external leakage, Theaxial leakage of the 2Dinternal piston circumferential pump with a balanced force is composed of external leakage, internal leakage, leakage. force
A new 2D piston pump with a balanced force is proposed, and its volumetric efficiency is studied through mathematical modeling
Summary
Hydraulic systems are widely used in many fields because of their high power density, quick dynamic response, and strong load capacity [1,2,3]. Due to the traditional 2D pump designed to discharge oil alternately between the left and right displacement chambers, the cylinder block is moved by an alternate force and generates vibration [25]. To solve this problem, we propose a 2D piston pump with a balanced force using a well-balanced. The mechanical structure working principle of the traditional 2D designed to discharge oil alternately between the left and and right displacement chambers, the cylinder block is moved by an alternate force and vibration [25]
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