Design Method with High Comprehensive Performance for External Gear-pumps and Gear-motors

Li Yulong; Liu Ping; Shi Yunyang

doi:10.16578/j.issn.1004.2539.2024.11.014

Abstract：Under the premise of ensuring constant output capacity and equal displacement,in order to im-prove the comprehensive performance of the external gear-pumps and gear-motors,the relation between the con-structed equal displacement and gear profile parameters,tooth width coefficient,and modulus was analyzed to in-vestigate the effects of tooth numbers,addendum coefficients,and modulus on lightweight,output pulsation,trapped oil phenomenon,radial force,and volumetric efficiency.A high comprehensive performance design method with equal displacement and large modulus was proposed based on the minimization of tooth width coef-ficient.The results indicate that the displacement is the product of three parts:the tooth profile formed by the number of teeth and the addendum coefficient,the tooth width coefficient,and the size formed by the modulus.The number of teeth and addendum coefficient are the main parameters that affect the lightweight effect and the pulsation quality.Based on the high comprehensive performance requirements of both,the optimal number of teeth,addendum coefficient,and tooth profile can be determined.Modulus is the main parameter that affects the radial force,the volumetric efficiency,and the oil trapping performance.Maximizing modulus is extremely bene-ficial for the full realization of these properties,especially high oil trapping performance.The maximum modulus is determined by the given displacement,optimal tooth profile,minimum tooth width coefficient,and modulus standardization requirements.The important conclusion is that the equal displacement large modulus design method can effectively improve the comprehensive performance of products.