Axial piston pump is an important power element in hydraulic system. Compared with other pumps, it has many characteristics, such as high working pressure, compact structure and variable ways. It is widely used in industrial and mobile mechanical fields. The thermal deformation of axial piston pump under different temperature conditions has an important influence on its stable operation and reliability, such as [1]. With the development of equipment in the field of marine vessels, aerospace and other fields, a wider temperature operation demand (as low as -40 C) has posed severe technical challenges to the structural design of the plunger pump. In addition, with the improvement of machining accuracy, the influence of thermal deformation on piston pump's normal operation is more and more obvious. [2 to 3], the thermodynamic behavior of axial piston pump is of guiding significance to the optimization design of its structure. Zhao Yongfu and others set up a finite element model of a distribution plate. The law between temperature and the stress and deformation of the distributor plate was obtained, which provided a simulation basis for the optimization design of the distributor plate structure [4]. Tang He Sheng and others studied the effect of thermal effect on the hydrostatic sliding bearing capacity of axial piston pump, and developed a set of lumped parameter mathematical models to predict its dynamic behavior [5]. Li Yunhua and others analyzed the thermal fluid structure coupling of axial piston pump in aircraft electro-hydraulic actuator. The results showed that although pump speed and high pressure could increase power density, it also improved the coupling performance of friction pair [6].

 

 

壳体是轴向柱塞泵的关键零部件，其变形特性对缸体、主轴等零件工作特性均具有重要影响。为研究柱塞泵壳体在低温环境下的热力学性能，分析其运行的应力分布、变形量等，本文以排量为190mL/r的某轴向柱塞泵壳体为例，对其低温变形行为进行有限元分析，最终分析研究部位的变形量——大端面密封圈、轴封位置的变形还有应力分布，同时为改善轴封处的变形提出可行性方案，并做论证分析。

The shell is the key component of the axial piston pump, and its deformation characteristics have an important influence on the working characteristics of the cylinder body and the spindle. For the thermodynamic performance of piston pump shell in low temperature environment, analysis of the operation of the stress distribution, deformation, the axial plunger pump with a displacement of 190mL/r as an example, the finite element analysis on the deformation behavior of the low temperature deformation, the deformation analysis of large amount of end - end parts of the seal ring, the position of the sealing and stress distribution, and puts forward the feasible scheme for improving the seal deformation, and analysis.