转速对EHA泵柱塞副柱塞位姿及泄漏量影响仿真分析

doi:10.3901/JME.2018.20.123

机械工程学报 ›› 2018, Vol. 54 ›› Issue (20): 123-130.doi: 10.3901/JME.2018.20.123

转速对EHA泵柱塞副柱塞位姿及泄漏量影响仿真分析

吕飞, 徐兵, 张军辉

浙江大学流体动力与机电系统国家重点实验室杭州 310027

收稿日期:2017-06-30 修回日期:2018-04-25 出版日期:2018-10-20 发布日期:2018-10-20
通讯作者: 徐兵(通信作者),男,1971年出生,博士,教授,博士研究生导师。主要研究方向为机电控制、流体动力元件与系统。E-mail:bxu@zju.edu.cn
作者简介:吕飞,男,1996年出生,博士研究生。主要研究方向为流体动力元件与电液控制。E-mail:ztxh2013@163.com
基金资助:
国家自然科学基金（U1737110）和国家重点基础研究发展计划资助项目（973计划，2014CB046403）。

Simulative Analysis of Piston Posture and Piston/Cylinder Interface Leakage of EHA Pumps by the Influence of Rotating Speed

LÜ Fei, XU Bing, ZHANG Junhui

State Key Laboratory of Fluid Power and Mechatronic System, Zhejiang University, Hangzhou 310027

Received:2017-06-30 Revised:2018-04-25 Online:2018-10-20 Published:2018-10-20

摘要/Abstract

摘要： 斜轴式轴向柱塞泵作为电动静液压作动器（Electro-hydrostatic actuator，EHA）液压系统的重要元件，高转速、高工作压力是实现其小型化、轻量化的重要手段。柱塞副是斜轴式轴向柱塞泵中重要的两对摩擦副之一，对斜轴式轴向柱塞泵的工作状况起着直接影响。随着缸体转动，柱塞在缸体柱塞孔中的位姿朝着各个方向不断变化，柱塞副泄漏量也随之变化。为准确得到高速高压下柱塞副的泄漏量并给出解释，充分考虑柱塞受力情况，通过对离散化的柱塞副油膜雷诺方程和力平衡方程进行迭代求解，使用柱塞端面偏移量来确切描述了柱塞在缸体柱塞孔中的位姿随转速的变化情况，据此给出了柱塞副泄漏量模型，分析了转速变化对柱塞位姿和柱塞副泄漏量的变化的影响。结论为EHA泵的设计提供了适当的理论指导。

关键词: EHA, 位姿, 斜轴式轴向柱塞泵, 泄漏量, 柱塞副

Abstract: As the significant component of EHA(electro-hydrostatic actuator), bent-axis type piston pumps can realize miniaturization and light quantification by high rotating speed and high working pressure. Piston/cylinder pair is one of the two important friction pairs of bent-axis type piston pumps, which directly affects the working condition of the pump. As the cylinder rotating, the posture of the piston in the cylinder bore is changing in all directions constantly, and the leakage flow of piston/cylinder interface is changing. So the aim of this paper is to get the leakage flow of piston/cylinder interface in high speed and high pressure accurately and offer the explanation. The force on the piston is fully taken into account, disperse the Reynolds equation of the Piston/cylinder pair oil film and iterative solve the force/moment equation, get the offset of the piston end faces to exactly describe the posture of the piston in the cylinder bore with rotating speed changing, the model of piston/cylinder interface leakage flow is given on the base, and analyzed the piston/cylinder interface leakage by the influence of rotating speed. The conclusion provides the appropriate theoretical guidance when design EHA pumps.

Key words: bent-axis axial piston pumps, electro-hydrostatic actuator(EHA), leakage, piston-cylinder pair, posture

中图分类号:

TH137

吕飞, 徐兵, 张军辉. 转速对EHA泵柱塞副柱塞位姿及泄漏量影响仿真分析[J]. 机械工程学报, 2018, 54(20): 123-130.

LÜ Fei, XU Bing, ZHANG Junhui. Simulative Analysis of Piston Posture and Piston/Cylinder Interface Leakage of EHA Pumps by the Influence of Rotating Speed[J]. Journal of Mechanical Engineering, 2018, 54(20): 123-130.

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转速对EHA泵柱塞副柱塞位姿及泄漏量影响仿真分析

Simulative Analysis of Piston Posture and Piston/Cylinder Interface Leakage of EHA Pumps by the Influence of Rotating Speed

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