轴向柱塞泵滑靴副热平衡间隙及影响因素分析

Thermal Clearance and Influencing Factors Analysis of Slipper Pair in Axial Piston Pump

为了改善轴向柱塞泵滑靴副润滑特性,考虑滑靴副与油膜之间的热传导关系,提出了一种基于控制体能量守恒定律的滑靴副热平衡间隙公式,讨论不同柱塞腔压力、缸体转速以及进口油液温度对热平衡间隙的影响.研究结果表明,滑靴副的热平衡间隙与材料的线膨胀系数和导热率成反比,影响材料的抗温升变形以及摩擦副的配合性能;滑靴和斜盘因表面温度升高而产生热膨胀,导致热平衡间隙显著减小,与柱塞腔压力、缸体转速以及进口油液温度成正比.因此,滑靴应该选取线膨胀系数和热导率大的材料,对于斜盘则正好相反,以减少滑靴表面磨损.

To improve the lubrication characteristic of slipper pair, the thermal clearance formula of slipper pair was proposed based on thermodynamic principles considering the heat conduction relationship between slipper pair and oil film. The laws of effect of different cylinder pressure, cylinder speed and inlet oil temperature on thermal clearance of slipper pair were discussed. The results show that the thermal clearance of slipper is inversely proportional to the linear expansion and thermal conductivity of material, which reduces the resistance capacity of material to deformation and matching performance of friction pair. Thermal expansion of slipper and swashplate are caused by surface temperature, which remarkably reduces the thermal clearance of slipper pair, and is positively proportional to cylinder pressure, speed and inlet oil temperature. Therefore, the high linear expansion and thermal conductivity of material is used as slipper in order to reduce surface wear, which is just the opposite to material selection of swashplate.