Abstract: Analyzed the number of pinion and teeth on the influence of flow pulsation.The mathematical model of the dual objective function was established with the minimum flow pulsation and the minimum volume of the gear mechanism, and the model was solved by the genetic algorithm.The results show that the flow pulsation can be reduced with the increase of the number of small gears;the number of ring gear teeth is inversely proportional to the flow pulsation, and the number of pinion gear teeth is proportional to the flow pulsation;the optimization results met the requirements of reducing the flow pulsation and improving the performance, so that the theoretical basis can be provided for the design and manufacture of the multi-teeth parallel internal gear pump.

Key words: genetic algorithm, multi-teeth parallel internal gear pump, flow pulsation, optimum design