新型双作用柱塞泵的设计与特性分析

为改善斜盘式柱塞泵的脉动性能，基于啮合理论和几何学的相关知识，提出了由双端曲面齿轮作为转子、双作用柱塞不间断排油的新型双作用柱塞泵.利用端曲面齿轮副传动原理，建立了双端曲面齿轮啮合坐标系和柱塞运动坐标系，结合柱塞泵的工作特性，进行了柱塞结构的设计，探讨了新型柱塞泵的柱塞分布情况；运用新型双作用柱塞泵的工作原理，推导出了柱塞位移、速度及相应的瞬时流量方程，并分析了柱塞数、偏心率和端曲面齿轮阶数对流量脉动率的影响因素.分析结果表明:相较于现有的斜盘式柱塞泵，新型双作用柱塞泵流量脉动率的变化趋势更为平稳，且流量脉动率随着柱塞数量的增多，偏心率的减小，端曲面齿轮阶数的增大而降低；通过试验，得出柱塞运动速度的最大误差为4.79 mm/s. 

Design and Analysis of New Type of Piston Pump

To improve the pulsating performance of a swashplate piston pump, a new type of double-acting piston pump is designed based on the meshing theory and the related knowledge of geometry. The pump is driven by the double curve-face gear and its pistons drain oil uninterruptedly. By using the transmission principle of the curve-face gear pair, the engagement coordinates of the double curve-face gear and piston motion analysis coordinates were established. The piston structure was designed according to the working characteristics of the piston pump, and the piston distribution of a new type piston pump is discussed. The equations of piston displacement, velocity, and instantaneous flow were deduced based on the working principle of the proposed double-acting piston pump, and the factors affecting the flow pulsation rate, such as the number of plungers, eccentricity, and the order of curve-face gear, were analysed. The analysis results show that compared with the existing swashplate piston pump, the variation in the flow pulsation rate of the proposed double-acting piston pump is more stable, and the flow pulsation rate decreases with increase in the number of plungers, decrease in the eccentricity, and increase in the order of the curve-face gear. The test-bed was used to test the plunger velocity, and the maximum error value is 4.79 mm/s.were in good agreement with the theoretical values; the error was less than 5%, which is within the allowable range of error.