Topic
Gear pump
About: Gear pump is a research topic. Over the lifetime, 7490 publications have been published within this topic receiving 38837 citations. The topic is also known as: Gear pump.
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Patent•
18 Nov 1976TL;DR: In this paper, a gear pump or motor in which a pair of meshing gears are rotatably mounted in a housing and a throttle passage provides communication between a region of the housing in which, during rotation of the gears, high pressure is maintained and the region of interstices between engaging teeth of the gear at which these interstice increase during such rotation, to prevent cavitation and to essentially reduce noise during operation.
Abstract: A gear pump or motor in which a pair of meshing gears are rotatably mounted in a housing and in which a throttle passage provides communication between a region of the housing in which, during rotation of the gears, high pressure is maintained and the region of the interstices between engaging teeth of the gears at which these interstices increase during such rotation, to prevent cavitation and to essentially reduce noise during operation.
26 citations
Patent•
19 Dec 1989TL;DR: In this paper, a drive gear and a driven gear for use in a rotary gear pump exhibiting good sliding characteristics against a pump case made of light metals such as alumi-num alloys.
Abstract: A drive gear (2) and a driven gear (3) for use in a rotary gear pump exhibiting good sliding characteristics against a pump case (4) made of light metals such as aluminum alloys. One or both parts are formed from an aluminum alloy material obtained by subjecting an aluminum alloy powder which has been rapidly solidified at a cooling rate of 100°C/sec or more, or aluminum alloy powder having a particle size of 350µm or less, to powder compaction followed by hot extrusion and optionally hot forging, or alternatively to powder forging.
26 citations
01 Jan 2008
TL;DR: In this paper, the authors describe a numerical procedure for the analysis and the optimization of external gear pumps, with particular reference to the geometry of the recesses machined on the bushings, based on a path search method known as Steepest Descent and optimizing the considered parameters starting from a design taken as initial reference.
Abstract: This paper describes a numerical procedure for the analysis and the optimization of external gear pumps. The Fluid Power group of the University of Parma has implemented a numerical code for the simulation of external gear pumps and motors; the code is named HYGESim and it is based on a lumped parameter approach implemented in AMESim, writing proper submodels in C language. This work is focused on the optimization of the pump design with particular reference to the geometry of the recesses machined on the bushings. The procedure is based on a path search method known as Steepest Descent and optimizes the considered parameters starting from a design taken as initial reference. The objective functions defined for the optimization permit to account for the volumetric efficiency, the delivery pressure ripple, the maximum and minimum pressure peaks during the meshing process. An optimal design of the recesses has been proposed and a prototype of a pump, equipped with the proposed geometry of bearing blocks, was tested. Measured data and the comparisons with the experimental results obtained for the stock pump taken as reference are presented in the paper, confirming the potentials of the developed optimization methodology.
26 citations
Patent•
18 Feb 2008
TL;DR: In this article, a parallel eccentric electro-mechanical actuator provides motive power and includes an electric prime mover that drives the reducer's pinion gear with stationary shaft bearings.
Abstract: A parallel eccentric electro-mechanical actuator provides motive power and includes an electric prime mover that drives the reducer's pinion gear. This pinion drives minimum three star gears with stationary shaft bearings. Each shaft contains an eccentric which are completely in parallel with each other. These eccentrics can be thought of as parallel/in-phase driven crankshafts. Each eccentric drives the parallel eccentric (PE) gear through a bearing. The PE gear exhibits a circular motion (without rotation) which in itself is unbalanced. The crankshafts have another eccentric which create an opposite inertia force to balance that of the PE gear. The PE gear contains an external toothed gear on its periphery. It meshes with the internal teeth of the output ring gear. The relative motion between the PE gear and the ring gear is that the PE gear rolls inside the ring gear. This relative motion is called hypo-cycloidal motion.
26 citations
Patent•
30 Dec 2011TL;DR: In this paper, an epicyclic gear train is coupled to drive a turbine engine, which includes a carrier that supports star gears that mesh with a sun gear, and a ring gear that surrounds and meshes with the star gears.
Abstract: A turbine engine includes a fan shaft and at least one tapered bearing mounted on the fan shaft. The fan shaft includes at least one radially extending passage adjacent the at least one tapered bearing. A fan is mounted for rotation on the tapered bearing. An epicyclic gear train is coupled to drive the fan. The epicyclic gear train includes a carrier that supports star gears that mesh with a sun gear, and a ring gear that surrounds and meshes with the star gears. Each of the star gears is supported on a respective journal bearing. The epicyclic gear train defines a gear reduction ratio of greater than or equal to about 2.3.
26 citations