Involute Gear Pumps Versus Lobe Pumps: A Comparison

[+] Author and Article Information
G. C. Mimmi

Dipartimento di Meccanica Strutturale, Università degli studi di Pavia, Via Ferrata 1, 27100 Pavia, Italia

P. E. Pennacchi

Dipartimento di Meccanica, Politecnico di Milano, Piazza L. da Vinci 32, 20133 Milano, Italia

J. Mech. Des 119(4), 458-465 (Dec 01, 1997) (8 pages) doi:10.1115/1.2826390 History: Received October 01, 1996; Revised July 01, 1997; Online December 11, 2007


In previous studies we have considered several types of positive displacement rotary pumps and deeply analyzed the generation of the flow rate and the design limits. This has been done in order to evaluate the main performance indexes; one of which, the flow rate irregularity, is related to the possibility that the pump becomes a source of vibration and noise. A second index is the specific flow rate, related to the delivery capacity of the pump. In this paper, following our previous researches, we analyzed internal involute gear pumps and internal lobe pumps, that have similar operations but different performances. The design parameters and the way to optimize the performances are proposed for both cases. Finally a comparison is made between the two types of pumps with optimum design parameters.

Copyright © 1997 by The American Society of Mechanical Engineers
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