轴向柱塞泵滑靴副的热结构耦合特性

Thermal-structural coupling characteristics of axial piston pump slipper pair

为了改善轴向柱塞泵滑靴副的耐磨损性能,建立了滑靴与斜盘摩擦副的瞬态热结构耦合模型,分析压力冲击条件下滑靴的表面温度、应力以及变形的变化规律.研究结果表明：某型轴向柱塞泵中滑靴温度随柱塞腔压力呈周期性变化,滑靴温度范围为45.5~49.8℃,且滑靴的最高温度出现在泵的吸排油过渡区.当滑靴处于泵的排油区时,滑靴的最大轴向应力为250MPa,集中在滑靴油腔与密封带之间的边缘区域.滑靴的轴向应力分层显著,引起滑靴的变形分化,其变形量为12.5~15μm,出现在滑靴的边缘.由于滑靴的输入热流密度增强磨粒的剪切力,加剧滑靴表面的微切削和挤压变形,导致滑靴表面出现条状剥落和凹坑磨损,呈现出黏着和磨粒磨损特征.

To improve the wear resistance of axial piston pump slipper pair, the transient thermal-structure coupling model was established based on the slipper/swash plate friction pair. Under the pressure shock condition, the slipper surface temperature, stress and deformation were analyzed. The results show that slipper temperature in a piston pump peri- odically changes with the piston chamber pressure and the range of slipper temperature from 45.5 ℃ to 49.8 ℃. The highest slipper temperature appears in the pump suction-discharge pressure transition zone. When the slipper runs in discharge pressure zone of pump, the maximum axial stress is 250MPa, which is concentrated on the edge region between slipper pocket and sealing belt. The layed axial stress of slipper is significant, causing the slipper deformation differentiation. The range of slipper deformation is from 12.5μm to 15 μm, which appears at the edge of slipper. Shear force of abrasive particle is enhanced by input heat flux of slipper intensifying micro cutting and extrusion deformation. Furthermore, strip exfoliation and pits are presented by wear surface of slipper, which shows adhesive and abrasive wear characteristics.