Teeth clearance effects upon pressure and film thickness in a trochoidal hydrostatic gear pump

Paffoni, B.; Progri, R.; Gras, R.

doi:10.1243/0954410041872799

Cited by 39 publications

(14 citation statements)

References 5 publications

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“…A step forward describing precisely the geometry of a gerotor pump to evaluate the effectiveness of surface contact, teeth clearance and deformation on teeth contact was conducted by Paffoni [21] and Paffoni et al [22]. Thus, sliding velocity, pressure contact and film thickness could be addressed and compared with a pump without clearance, and important results were presented.…”

Section: Historical Backgroundmentioning

confidence: 99%

A Review of Gerotor Technology in Hydraulic Machines

2019

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Over the years, numerous investigations have established the gerotor fundamentals. This work aims to provide a complete review of the literature from the last decade, focusing on the articles published in the past five years on gerotor technology in hydraulic machines. The report gives a catalogue of guidelines based on the trochoidal-envelope definition, a background analysis, the worldwide distribution of articles in each continent and country and the most frequently used keywords in the field. The paper identifies state-of-the-art research, and reports on current mainstream ideas. From the historical background, this literature review reports the current approaches in gerotor pumps (geometry and performance approaches, modeling and numerical simulations), orbital motors and new concepts. The report will serve as a guide and a directory for novel engineers working with gerotor technology in hydraulic machines. Another intention of this paper is to disseminate the works of the researchers who use this technology around the world, and to provide a scenario for future international collaboration. The paper gives an account of the disparity between academia and engineering applications. There is currently very little published literature on design and production methodologies for gerotor pumps and orbital motors. Hence, the future goal is to collect recommendations that combine academia and industry expertise to make better use of these extensive studies in the field.

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Section: Historical Backgroundmentioning

confidence: 99%

A Review of Gerotor Technology in Hydraulic Machines

2019

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“…Some complex analytic methods, such as the Tooth Contact Analysis (TCA) [98], have been developed for the calculation of the real line of contact and also of the clearance between the pair of teeth not in contact [99][100][101]. As alternative, it is possible to use a less refined but effective procedure [34].…”

Section: Teeth Clearancementioning

confidence: 99%

Models for Flow Rate Simulation in Gear Pumps: A Review

Rundo

2017

Energies

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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.

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“…Without considering manufacturing installation error and elastic deformation during works and the thermal deformation caused by clearance changes under the condition of [16,[24][25][26], once confirmed the link under a certain condition gets the best convergence of the medial convergence gap, so it can proceed to link the inside dimensions of design calculation, as shown in Fig. (5).…”

Section: The Example Computation and Analysismentioning

confidence: 99%

Lubrication Performance Improvements on Two Side-Surfaces of Crescent Board in Internal Involute Gear Pump

Zhenxing¹,

Liu²,

Li³

2015

TOMEJ

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Abstract:To improve the oil film force for enhancing lubrication effect and reducing wear and increasing service life within radial friction pair of internal involute gear pump, the oil wedge for hydrodynamic lubrication effect was the better solution. On the basis of related theory of hydrodynamic lubrication, from the two arc surfaces adjustment of crescent board inside and outside, the current parallel radial gaps were made into non-parallel radial convergence gaps with oil wedge structure for hydrodynamic lubrication effect, so the current single hydrostatic lubrication state would be changed into the combination state with hydrostatic lubrication and hydrodynamic lubrication. In the case of the radial gap on the inside arc surface of crescent board as a example, From the maximum oil film force conditions, the best convergence ratio of inside radial gap could be derived, and then the new center position and new radius value of inside adjusted arc contour of crescent board were calculated. All results indicated that, after the current parallel radial gaps were replaced by the nonparallel radial best convergence gap, the oil film force and the volumetric efficiency of pump would be significantly improved, under the case parameters, the best convergence rate with the initial pressure difference of 1.9 MPa was 0.96, but the corresponding best convergence rate without the initial pressure difference was about 1.2, at the same time, the oil film force was increased by 92.4%, the liquid flow rate brought into the discharge oil cavity from the absorption oil cavity of pump was increased by 30.2%; at the same time, the higher the driving speed and the thinner the minimum oil film thickness and the lower the discharge oil pressure is, the greater the best convergence ratio and the bigger the oil film force or the increase of the oil film force and the higher the pump volume efficiency and the more obvious the hydrodynamic lubrication effect and the greater the liquid flow rate brought into the discharge oil cavity from the absorption oil cavity of pump is, it could be said that the higher the driving speed was, the more obvious the hydrodynamic lubrication effect, but the less obvious the hydrostatic lubrication effect, in contrast with this, the higher the discharge oil pressure was, the more obvious the hydrostatic lubrication effect, but the less obvious the hydrodynamic lubrication effect; because the adjustment value of the inside arc contour of crescent board was smaller, in practical application, these factors such as manufacturing error and elastic deformation and thermal deformation must be comprehensively involved in the oil wedge structure design. Finally, the important conclusions are obtained that the design method of oil wedge structure on the inside and outside arc surface of crescent board is proved feasible, as for other such as straight line conjugate internal gear pump with crescent board, the relevant content of this paper also can be used for its oil wedge structure design, but because of oil wedg...

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Teeth clearance effects upon pressure and film thickness in a trochoidal hydrostatic gear pump

Cited by 39 publications

References 5 publications

A Review of Gerotor Technology in Hydraulic Machines

A Review of Gerotor Technology in Hydraulic Machines

Models for Flow Rate Simulation in Gear Pumps: A Review

Lubrication Performance Improvements on Two Side-Surfaces of Crescent Board in Internal Involute Gear Pump

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