双圆弧斜齿齿轮泵脉动特性分析及齿形设计

针对普通渐开线齿轮泵流量脉动大、噪声大以及困油现象等问题，设计出一种以双圆弧斜齿轮为运动副的齿轮泵。对比分析啮合特性，得出双圆弧斜齿轮传动的优越性。以正弦曲线为过渡曲线，利用啮合共轭原理求解出双圆弧斜齿轮端面齿廓方程。采用等面积法求解了双圆弧斜齿齿轮泵的最大和最小瞬时排量，得出理论脉动趋于零的结论。利用FLUENT三维动网格技术，对比分析齿轮参数相同的双圆弧斜齿轮泵和渐开线斜齿轮泵的流量脉动，得出前者的流量脉动远小于后者的结论。

Pulsation Characteristic Analysis and Tooth Profile Design of Double-circular-arc Helical Gear Pumps

Aiming at problems of large flow pulses, noises and serious oil trapped phenomenons of involute gear pumps, a gear pump with double-circular-arc helical gears as motion pair was proposed. Through comparison and analysis of their meshing characteristics, advantages of double-circular-arc helical gear drives were obtained. Taking sine curve as transition curve and on the basis of conjugate principles of gear meshing, equation of transverse profiles of double-circular-arc helical gear were solved. Equal area method was used to deduce the displacement of double circular arc gear pumps, then maximum and minimum instantaneous displacements of the double-circular-arc helical gear pumps were solved, thus the theoretical pulsation tended to zero. Flow pulsations of double-circular-arc helical gear pumps and involute helical gear pumps with the same gear parameters were compared and analyzed by using 3D dynamic mesh technology of Fluent. The flow pulsations of the former are much smaller than that of the latter.