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14:30 ics Saal 4
A Flow Control System for a Novel Concept of Variable Delivery External Gear Pump
Andrea Vacca, Purdue University, USA
Ram S. Devendran, Ford Motor Company
This paper describes a novel concept for a low cost variable delivery external gear
pump (VD-EGP). The proposed VD-EGP is based on the realization of a variable
timing for the connections of the internal displacement chambers with the inlet and
outlet ports. With respect to a standard EGP, an additional element (slider) is used
along with asymmetric gears to realize the variable timing principle. Previously
performed tests confirmed the validity of the concept, for a design capable of varing the
flow in the 65%-100% range.
Although the VD-EGP concept is suitable for various flow control system typologies
(manual, electro-actuated, hydraulically flow- or pressure- compensated), this paper
particularly details the design and the test results for a prototype that includes both a
manual flow control system and a pressure compensator. Flow vs pressure and
volumetric efficiency curves are discussed along with transient (outlet flow fluctuation)
features of the VD-EGP.