Gear Pump Gerotor

Wear of contact surfaces is one of the most common causes of gear failure. In addition to physical and chemical processes that occur in the contact zone, ki-nematic meshing parameters have a great effect on the wear process. This paper analyses the influence of geometric and kinematic parameters of the gear profile on the instantaneous friction coefficient of the trochoidal gearing in the gerоtor pump. The friction coefficient is not a constant value and it varies during the teeth meshing as a result of a constant change in the lubrication regime. There are many empirical expressions for calculation of the instantaneous friction coefficient, but due to numerous limitations, many of these expressions can be applied only to certain operating conditions and loads. The analysis of the friction coefficient was performed through two contact periods defined by the change in direction of the rolling velocity of the meshing profiles contact point. The obtained results enable identification of dominant factors that influence the instantaneous friction coefficient and show possibilities for further development of analytical models of mechanical losses in the gerоtor pump. There is a wide range of pumps used in modern industrial practice. One of the simplest is a gerоtor pump. Gerоtor (trochoidal) pumps are rotary pumps with in

PROJETO E ANÁLISE DO BOMBEAMENTO POSITIVO ENTRE MÚLTIPLAS CONFIGURAÇÕES DE ENGRENAMENTO EXTERNO
Trabalho de conclusão de curso apresentado a Universidade Paulista Campus Flamboyant como exigência parcial para obtenção do título de bacharel em Engenharia Mecânica.

Gear pumps represent the majority of the fixed displacement machines used for flow generation in fluid power systems. In this context, the paper presents a review of the different methodologies used in the last years for the simulation of the flow rates generated by gerotor, external gear and crescent pumps. As far as the lumped parameter models are concerned, different ways of selecting the control volumes into which the pump is split are analyzed and the main governing equations are presented. The principles and the applications of distributed models from 1D to 3D are reported. A specific section is dedicated to the methods for the evaluation of the necessary geometric quantities: analytic, numerical and Computer-Aided Design (CAD)-based. The more recent studies taking into account the influence on leakages of the interactions between the fluid and the mechanical parts are explained. Finally the models for the simulation of the fluid aeration are described. The review brings to evidence the increasing effort for improving the simulation models used for the design and the optimization of the gear machines.

The method of factorial experimental design for studying the factor influence on the flow rate and volumetric efficiency of the gerotor pump is applied in this paper. The considered factors are the coefficient of the trochoid radius, the number of revolution of a pump drive shaft and working pressure, where the first factor is a geometrical parameter and the others are working parameters. Factorial design and response surface methodology (RSM) are applied to evaluate and optimize the effects of these parameters on the flow rate and volumetric efficiency. The experimental design 33 is used, where each factor has three levels. Its optimal variant is obtained by the analysis of considered factors: the coefficient of the trochoid radius 1.375, the number of revolution of a pump drive shaft 2000 rpm and the working pressure 1 bar, where the the greatest values of flow rate and volumetric efficiency are obtained. A mathematical prediction model of the flow rate and volumetric efficiency has been developed in terms of above parameters.

Original scientific paper Taguchi method has been used to analyse the influence of the coefficient of the trochoid radius, the number of revolutions and the working pressure on the change in the flow rate and the volumetric efficiency of the trochoidal rotary pump with internal gearing. The coefficient of the trochoid radius, as a geometrical parameter and the number of revolutions and the pressure, as working parameters are considered influential factors in this paper. Taguchi robust design and orthogonal matrices have been applied to design the experiment and to determine the degree of the factors influence, as well as their optimum values. The highest values both for the flow rate and the volumetric efficiency have been obtained for the coefficient of the trochoid radius of 1.375, the number of revolutions of 2000 min −1 and for the working pressure of 1 bar. The conformation of the experiment shows that Taguchi method can be successfully used for selection of the optimal combination of parameters so that the maximum volumetric efficiency of the trochoid pump can be achieved.

Original scientific paper Taguchi method has been used to analyse the influence of the coefficient of the trochoid radius, the number of revolutions and the working pressure on the change in the flow rate and the volumetric efficiency of the trochoidal rotary pump with internal gearing. The coefficient of the trochoid radius, as a geometrical parameter and the number of revolutions and the pressure, as working parameters are considered influential factors in this paper. Taguchi robust design and orthogonal matrices have been applied to design the experiment and to determine the degree of the factors influence, as well as their optimum values. The highest values both for the flow rate and the volumetric efficiency have been obtained for the coefficient of the trochoid radius of 1.375, the number of revolutions of 2000 min −1 and for the working pressure of 1 bar. The conformation of the experiment shows that Taguchi method can be successfully used for selection of the optimal combination of parameters so that the maximum volumetric efficiency of the trochoid pump can be achieved.

The method of factorial experimental design for studying the factor influence on the flow rate and volumetric efficiency of the gerotor pump is applied in this paper. The considered factors are the coefficient of the trochoid radius, the number of revolution of a pump drive shaft and working pressure, where the first factor is a geometrical parameter and the others are working parameters. Factorial design and response surface methodology (RSM) are applied to evaluate and optimize the effects of these parameters on the flow rate and volumetric efficiency. The experimental design 33 is used, where each factor has three levels. Its optimal variant is obtained by the analysis of considered factors: the coefficient of the trochoid radius 1.375, the number of revolution of a pump drive shaft 2000 rpm and the working pressure 1 bar, where the the greatest values of flow rate and volumetric efficiency are obtained. A mathematical prediction model of the flow rate and volumetric efficiency has been developed in terms of above parameters.