Servo Variable Displacement Characteristics of Swash Plate Axial Piston Pump

doi:10.12382/bgxb.2021.0814

Abstract

Abstract:

Servo variable displacement is the most commonly used variable displacement mode for swash plate axial piston pumps and has a direct influence on the pump’s performance. However, its mechanism is complicated, making it still a major obstacle to the development of swash plate axial piston pumps in China. To address challenges in the development and testing of high-pressure axial piston pumps such as high variable pressure shock and inability to brake completely, in-depth research is conducted to understand the impact of different factors on the variable displacement characteristics. The dynamic process is divided into four phases: the starting process, return process, braking process, and braking recovery process. The numerical model of the variable displacement mechanism is established by using AMEsim, and the validity of the model is verified by comparing the pressure curve test and simulation results. The servo variable displacement system is simulated numerically under different conditions of inlet damping, return damping, and return spring stiffness. The results show that both inlet and return damping affect the dynamic process of variable displacement, and the spring stiffness mainly affects the braking process.

Key words: swash plate axial piston pump, servo variable displacement, variable displacement test, influence factors

CLC Number:

TH137.52

DU Shanxiao, ZHOU Junjie, JING Chongbo, ZHANG Zhu, LIAO Wenbo. Servo Variable Displacement Characteristics of Swash Plate Axial Piston Pump[J]. Acta Armamentarii, 2023, 44(1): 193-201.

Figures/Tables 22

Fig.1 Schematic diagram of the servo variable displacement system

Fig.2 Oil circuit of the servo variable displacement system

Fig.3 Test rig of the hydraulic pump/motor closed-loop circuit

Table 1 Main parameters of the test rig

系统	部件	参数	数值
控制与数据采集系统	电机	功率/kW	1000
		转速/(r·min^-1)	3000
	转速传感器	转速量程/(r·min^-1)	5000
		测量精度/(r·min^-1)	±1
	压力传感器	压力量程/MPa	60
		测量精度	0.5%FS
液压泵/马达系统	液压泵	最大压力/MPa	42
		排量/(mL·r^-1)	75
	马达	排量/(mL·r^-1)	75
		转速/(r·min^-1)	3150

Fig.4 Servo cylinder pressure change during start-up and return

Fig.5 Servo cylinder pressure change during braking

Fig.6 Valve group profile of the variable displacement mechanism

Fig.7 Servo cylinder structure

Fig.8 Feedback tie rod force diagram

Fig.9 AMEsim-based simulation model of the servo-variable displacement system

Fig.10 Simulation and test comparison of servo cylinder pressure change

Fig.11 Change in the displacement of variable piston

Fig.12 Trend of servo cylinder pressure change during start-up and return

Fig.13 Displacement of the variable piston during start-up and return

Fig.14 Servo cylinder pressure change during braking

Fig.15 Displacement of the variable piston during braking

Fig.16 Servo cylinder pressure change during start-up and return

Fig.17 Change of displacement of variable piston

Fig.18 Trend of servo cylinder pressure change during braking

Fig.19 Variable piston displacement change during braking

Fig.20 Servo cylinder pressure change with different spring stiffnesses

Fig.21 Change of displacement of variable piston with different spring stiffnesses

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