A new design of the Lobe pump is based on the meshing principle of elliptical gear pairs

The paper presents a new rotor design of an external coupling Lobe pump driven by pair elliptical gears. is four-tooth gear with tooth profile improve cylocid curve. curve the locus fixed point on generation circle, when circle pure rolling without slipping centrode rotor. conditions addendum and dedendum profiles are also considered. limited supply angle determined through iterative algorithm makes ellipse base From there, we proceed to determine parameters according characteristic forming profile. flow rate area pockets cross-section perpendicular shaft. On that basis, Matlab program written from mathematical model established calculate design. In addition, investigates effect coefficient l (semi-major axis divided semi-minor ) average distance. Survey results show at = 0.5 52.17% larger distance reduced 21.43% compared traditional 1. This advantage proposed this study.