Pressure transients in an external gear hydraulic pump

Abstract

A measurement technique, that extends and integrates former experimental activities, has been developed to detect the variation with time of tooth space pressure in an external gear pump by use of a pressure transducer fi tted in the driver gear. The pressure signal from the miniature strain gauge sensor mounted in the bottom of the tooth space is taken out via slip-rings for acquisition and analysis. Angular phase is determined by an optical encoder connected to -the driven gear. The specific location of the sensor was selected to acquire a better insight and understanding of typical phenomena occurring within an external gear unit in operation.
Results of the investigations may lead to a more thorough treatment of aspects improperly described in the mathematical model and support interventions on the geometry features of the pump aimed at better performance and lower radiated noise from these units.