The Open Mechanical Engineering Journal


ISSN: 1874-155X ― Volume 14, 2020
Retracted Article

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

The Open Mechanical Engineering Journal , 2015, 9: 443-448

Ren Zhenxing, Liu Chunyan, Li Yulong

Industrial Manufacturing School, Chengdu University, Chengdu, Sichuan 610106, China.

Electronic publication date 26/6/2015
[DOI: 10.2174/1874155X01509010443]


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 wedge structure, so the design method of oil wedge structure of radial gap only b appropriate for one-way internal gear pump.

Download PDF

Related Article: Retraction Notice
Track Your Manuscript:


"Open access will revolutionize 21st century knowledge work and accelerate the diffusion of ideas and evidence that support just in time learning and the evolution of thinking in a number of disciplines."

Daniel Pesut
(Indiana University School of Nursing, USA)

"It is important that students and researchers from all over the world can have easy access to relevant, high-standard and timely scientific information. This is exactly what Open Access Journals provide and this is the reason why I support this endeavor."

Jacques Descotes
(Centre Antipoison-Centre de Pharmacovigilance, France)

"Publishing research articles is the key for future scientific progress. Open Access publishing is therefore of utmost importance for wider dissemination of information, and will help serving the best interest of the scientific community."

Patrice Talaga
(UCB S.A., Belgium)

"Open access journals are a novel concept in the medical literature. They offer accessible information to a wide variety of individuals, including physicians, medical students, clinical investigators, and the general public. They are an outstanding source of medical and scientific information."

Jeffrey M. Weinberg
(St. Luke's-Roosevelt Hospital Center, USA)

"Open access journals are extremely useful for graduate students, investigators and all other interested persons to read important scientific articles and subscribe scientific journals. Indeed, the research articles span a wide range of area and of high quality. This is specially a must for researchers belonging to institutions with limited library facility and funding to subscribe scientific journals."

Debomoy K. Lahiri
(Indiana University School of Medicine, USA)

"Open access journals represent a major break-through in publishing. They provide easy access to the latest research on a wide variety of issues. Relevant and timely articles are made available in a fraction of the time taken by more conventional publishers. Articles are of uniformly high quality and written by the world's leading authorities."

Robert Looney
(Naval Postgraduate School, USA)

"Open access journals have transformed the way scientific data is published and disseminated: particularly, whilst ensuring a high quality standard and transparency in the editorial process, they have increased the access to the scientific literature by those researchers that have limited library support or that are working on small budgets."

Richard Reithinger
(Westat, USA)

"Not only do open access journals greatly improve the access to high quality information for scientists in the developing world, it also provides extra exposure for our papers."

J. Ferwerda
(University of Oxford, UK)

"Open Access 'Chemistry' Journals allow the dissemination of knowledge at your finger tips without paying for the scientific content."

Sean L. Kitson
(Almac Sciences, Northern Ireland)

"In principle, all scientific journals should have open access, as should be science itself. Open access journals are very helpful for students, researchers and the general public including people from institutions which do not have library or cannot afford to subscribe scientific journals. The articles are high standard and cover a wide area."

Hubert Wolterbeek
(Delft University of Technology, The Netherlands)

"The widest possible diffusion of information is critical for the advancement of science. In this perspective, open access journals are instrumental in fostering researches and achievements."

Alessandro Laviano
(Sapienza - University of Rome, Italy)

"Open access journals are very useful for all scientists as they can have quick information in the different fields of science."

Philippe Hernigou
(Paris University, France)

"There are many scientists who can not afford the rather expensive subscriptions to scientific journals. Open access journals offer a good alternative for free access to good quality scientific information."

Fidel Toldrá
(Instituto de Agroquimica y Tecnologia de Alimentos, Spain)

"Open access journals have become a fundamental tool for students, researchers, patients and the general public. Many people from institutions which do not have library or cannot afford to subscribe scientific journals benefit of them on a daily basis. The articles are among the best and cover most scientific areas."

M. Bendandi
(University Clinic of Navarre, Spain)

"These journals provide researchers with a platform for rapid, open access scientific communication. The articles are of high quality and broad scope."

Peter Chiba
(University of Vienna, Austria)

"Open access journals are probably one of the most important contributions to promote and diffuse science worldwide."

Jaime Sampaio
(University of Trás-os-Montes e Alto Douro, Portugal)

"Open access journals make up a new and rather revolutionary way to scientific publication. This option opens several quite interesting possibilities to disseminate openly and freely new knowledge and even to facilitate interpersonal communication among scientists."

Eduardo A. Castro
(INIFTA, Argentina)

"Open access journals are freely available online throughout the world, for you to read, download, copy, distribute, and use. The articles published in the open access journals are high quality and cover a wide range of fields."

Kenji Hashimoto
(Chiba University, Japan)

"Open Access journals offer an innovative and efficient way of publication for academics and professionals in a wide range of disciplines. The papers published are of high quality after rigorous peer review and they are Indexed in: major international databases. I read Open Access journals to keep abreast of the recent development in my field of study."

Daniel Shek
(Chinese University of Hong Kong, Hong Kong)

"It is a modern trend for publishers to establish open access journals. Researchers, faculty members, and students will be greatly benefited by the new journals of Bentham Science Publishers Ltd. in this category."

Jih Ru Hwu
(National Central University, Taiwan)

Browse Contents

Webmaster Contact:
Copyright © 2023 Bentham Open