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•
20 Dec 1994
TL;DR: In this article, a planetary gear train with herringbone gears is used and rotated so that oil within the gear meshes is pumped axially outward toward the channels, and the expelled oil enters and oil discharge passage (62) in an oil collection channel adjacent to an axially outboard of the ring gear (18).
Abstract: A lubrication system for a planetary gear train (6) includes oil spray bars (32) intermediate each pair of planet gears (10). Oil exits the meshes between the sun gear (8) and the planet gears (10) and between the planet gears (10) and the ring gear (18) with substantial tangential velocity. The expelled oil enters and oil discharge passage (62) in an oil collection channel (56) adjacent to an axially outboard of the ring gear (18). In the preferred embodiment, herringbone gears are used and rotate so that oil within the gear meshes is pumped axially outward toward the channels. Interplanet baffles (80) and collection troughts (82) may also be used and are especially beneficial in an alternative embodiment which uses bihelical gears whose direction of rotation pumps oil within the gear meshes axially inward.
107 citations
Book•
26 Sep 2000
TL;DR: This paper presents an evaluation of New Fluid Machinery Concepts for Pumps and their applications in Pumping Systems, as well as design examples of pump systems used in this study.
Abstract: Fluid Mechanic Fundamentals. Instability, Turbulence and Separation. Pipes, Bends and Diffusers. Pumping Systems. General Pump Theory. Pump Fluid Mechanics. Boundary Layers in Pumps. Cavitation in Pumps. Performance Calculation. Pump Design Procedure. Design Examples. Rotor Dynamics of Pumps. Inlet and Exit Recirculation. Two-Phase Flow in Pumps. High-Viscosity Pumps. Sand and Slurry Erosion in Pumps. Ejector Pump Systems. Evaluation of New Fluid Machinery Concepts. Computer Programs for Pumps. Appendix. Index.
104 citations
Patent•
22 Dec 1994
TL;DR: In this paper, a variety of materials, including ceramic, plastic, metal and magnetic media, are used in a preferred embodiment of an x-ray lithographic technique, such as sacrificial LIGA.
Abstract: Problems which have prevented the application of microfabrication techniques to fluidic devices are overcome, enabling the realization of a wide variety of devices, including vane pumps, centrifugal pumps, gear pumps, flow sensors, piston pumps, piston valves, hydraulic motors, nozzles, and connectors. Such devices are characterized by very steep walls (e.g. runout of 0.1 νm for a wall height of 100 νm) and very tight tolerances. The devices may be made of a variety of materials, including ceramic, plastic, metal and magnetic media. An x-ray lithographic technique, such as sacrificial LIGA, is used in a preferred embodiment.
94 citations
TL;DR: In this article, a new geometry of the rotor profiles of a cycloidal pump is proposed to provide that only one pair of teeth is in mesh at every instant, and to avoid tooth interference and rapid wearing that occur in the case of a conventional pump whereas all the rotor teeth are in mesh.
94 citations
TL;DR: In this paper, gear pumps using micro gear wheels with diameters of 596 and and a height of have been realized at IMM by means of a combination of LIGA technology and precision engineering.
Abstract: Gear pumps using micro gear wheels with diameters of 596 and and a height of have been realized at IMM by means of a combination of LIGA technology and precision engineering. Using oil as pumping medium the pumps achieve back pressures of more than 1200 hPa and flow rates of up to . The self-filling pumps tolerate air bubbles and particles contained in the working medium. The gear pumps displace 82 and 213 nl respectively per revolution, i.e. they offer the possibility of very precise dosing of viscous fluids, such as oil.
84 citations