Design and performance of gear pumps with a non-involute tooth profile

Nagamura, Kazuteru; Ikejo, Kiyotaka; Tutulan, Florin Gabriel

doi:10.1177/095440540421800703

Cited by 24 publications

(17 citation statements)

References 5 publications

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“…Other researches employed lumped parameter approach to predict the instantaneous flow and pressure particularly in the meshing area of gear pumps. 13,14 In order to investigate the geometric design of the gear tooth profile and the body of the pump influence on flow characteristics of gear pump, Nagamura et al 15 derived three types of non-involute tooth profiles and calculated accurately the displacement volume to optimize the pump performance. The numerical modeling method generated results in good agreement with the experimental results.…”

Section: Introductionmentioning

confidence: 99%

Flow characteristics of external gear pumps considering trapped volume

Hao

Zhou

Liu

et al. 2016

Advances in Mechanical Engineering

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This article investigates the volume change law of trapped fluid in the meshing process and the flow characteristics of external gear pumps under the following two cases: the pump design with and without relief groove. In this study, a mathematical modeling of gear pairs is deduced based on the meshing theory and a complete set of mathematical equations of tooth profile, and the flow rate equation is derived based on law of conservation of mass across the changing boundaries of a control volume. During the process, the function of the pump displacement is established, which is formed by two parts: tooth space volume and trapped volume. In addition, using a control volume approach, the trapped volume and flow rate characteristics of the pump under different design parameters of gears are discussed. The results show that the curve of trapped volume is similar to a parabola and the pump designed with a large number of teeth, module, and pressure angle easily obtained good flow rate characteristics under the same condition, which have a great benefit for designing the relief grooves and external gear pumps.

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Section: Introductionmentioning

confidence: 99%

Flow characteristics of external gear pumps considering trapped volume

Hao

Zhou

Liu

et al. 2016

Advances in Mechanical Engineering

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“…For years this issue has been tackled using various designs that include among others, tooth forms different than involute ones [1, 2,6], addendum modifications (shifted teeth) [1,4], non-conjugate gears [3,7] and helical gear tooth design (or herringbone) [2]. Also, some non-geometrical solutions have been proposed to address the problem on a systems level including use of oil accumulators and internal/ external controlled leakages [5], however the inherent complexity, cost and reduced adaptability over a wide range of speeds, flowrates and pressures have rendered the use of the above solutions very limited in practice.…”

Section: Introductionmentioning

confidence: 99%

Modeling and optimization of the delivery fluctuation of gear pumps

et al. 2019

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Presented work aims to minimize the delivery fluctuation of a gear pump through geometrical optimisation of the tooth flank. Therefore, instead of examining various configurations, which would reduce the flow ripple ad hoc , the current study suggests the dependence the delivery fluctuation to the tooth flank profile. Taking into account the secondary derivative of the tooth profile, the optimisation process is able to also affect the secondary delivery fluctuation, which is connected to the compression of the fluid over the meshing cycle. Bezier-Bernstein polynomial curves were used to model the tooth flank in order to satisfy the objective function. A dependency between the total length of the path of contact curve and the flow ripple was found. It is stated in this work that for every design point on a closed path of gear set, there is a threshold on the contact length, over which the resulted flow ripple starts to deviate from the optimum value. That conclusion was used to further enhance the optimisation algorithm. The presented optimum gear profile design was evaluated through a comparative study between every design point and the corresponding solution of the existing state of the art in terms of delivery fluctuation.

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“…For EGMs, this effort has resulted in the formulation of design solutions that involve tooth profile modifications able to reduce the kinematic flow oscillations: Manring and Huang formulated criteria suitable for standard involute designs [6,9]; Negrini introduced the so-called dual-flank principle, a zero-backlash solution currently adopted by several manufacturers that permits to increase the number of displacement chambers [4] to reduce the flow oscillations. Most recent efforts involved the research of non-standard gear profiles-such as asymmetric [10,11], cycloidal-involute [12][13][14][15] able to minimize the kinematic flow oscillations associated with the meshing of the gears. The effects of fluid compressibility on the outlet flow oscillations in EGMs was considered by several researchers, such as Mucchi [5], Casoli et al [16], Borghi et al [17], and criteria for minimizing their impact on the flow oscillations through design optimization of recesses facing the gear in the meshing area were provided in several studies, such as [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Modeling Noise Sources and Propagation in External Gear Pumps

et al. 2017

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As a key component in power transfer, positive displacement machines often represent the major source of noise in hydraulic systems. Thus, investigation into the sources of noise and discovering strategies to reduce noise is a key part of improving the performance of current hydraulic systems, as well as applying fluid power systems to a wider range of applications. The present work aims at developing modeling techniques on the topic of noise generation caused by external gear pumps for high pressure applications, which can be useful and effective in investigating the interaction between noise sources and radiated noise and establishing the design guide for a quiet pump. In particular, this study classifies the internal noise sources into four types of effective load functions and, in the proposed model, these load functions are applied to the corresponding areas of the pump case in a realistic way. Vibration and sound radiation can then be predicted using a combined finite element and boundary element vibro-acoustic model. The radiated sound power and sound pressure for the different operating conditions are presented as the main outcomes of the acoustic model. The noise prediction was validated through comparison with the experimentally measured sound power levels.

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Design and performance of gear pumps with a non-involute tooth profile

Cited by 24 publications

References 5 publications

Flow characteristics of external gear pumps considering trapped volume

Flow characteristics of external gear pumps considering trapped volume

Modeling and optimization of the delivery fluctuation of gear pumps

Modeling Noise Sources and Propagation in External Gear Pumps

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