斜盘式轴向柱塞泵柱塞颈部最小直径设计

Design of Minimum Diameter of Piston Neck in Swashplate Axial Piston Pump

为了解决斜盘式轴向柱塞泵在高速高压下产生柱塞颈部断裂的问题,对柱塞泵柱塞颈部的设计及校核开展研究,提出柱塞颈部最小直径的设计方法。基于排油区柱塞滑靴组件的受力分析,建立高压下柱塞颈部受力模型。基于应力-强度干涉分布理论,结合柱塞颈部应力分布和柱塞疲劳强度,提出柱塞颈部疲劳可靠度表达式,得到轴向柱塞泵柱塞颈部最小直径。利用有限元法对最小颈部直径柱塞进行静力学仿真分析,结合应力云图实现柱塞强度的安全性校核。在额定工况下,对根据柱塞颈部最小直径的设计方法设计出的轴向柱塞泵开展了容积效率和机械效率试验,利用本研究的设计准则针对同类产品的轴向柱塞泵柱塞颈部进行设计验证,验证所提出的柱塞颈部最小直径设计方法的合理性。

In order to solve the problem of the swashplate axial piston pump causing the plunger neck fracture under high speed and high pressure,the design and verification of the plunger neck of the plunger pump are studied,and the design method of the minimum diameter of the plunger neck is proposed.Based on the force analysis of the plunger shoe assembly in the drain area,a force model of the plunger neck under high pressure is established.Based on the stress-strength interference distribution theory,combined with the stress distribution of the plunger neck and the fatigue strength of the plunger,the expression of the fatigue reliability of the plunger neck is proposed,and the minimum diameter of the neck of the plunger of the axial piston pump is obtained.The finite element method was used to perform static simulation analysis of the plunger with the minimum neck diameter,and the safety check of the plunger strength was realized by combining the stress cloud diagram.Under the rated working conditions,the axial piston pump designed according to the design method of the minimum diameter of the plunger neck was tested with volumetric efficiency and mechanical efficiency,the design criteria are used to verify the design of the plunger neck of the axial piston pump of similar products,and the rationality of the proposed design method of the minimum diameter of the plunger neck was verified.