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.%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.
展开▼
