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Hydraulic Power Generation
Published in Qin Zhang, Basics of Hydraulic Systems, 2019
There are many different types of gear pumps other than the spur gear pump. A few commonly seen examples are lobe, gerotor, and screw pumps. A lobe pump is a rotary, external-gear pump and operates in a similar way to a conventional external gear pump. The major difference is that both lobes are driven externally so that they do not actually contact each other and are therefore much quieter than a conventional gear pump in operation. Another noticeable difference is that a lobe pump generally produces greater pulsation on the discharge flow due to the smaller number of teeth than a conventional gear pump. A gerotor pump is a rotary, internal-lobe pump and operates similarly to a conventional internal gear pump. In a typical gerotor pump, the inner rotor does mesh with the outer rotor to drive the pumping operation. Normally, the outer rotor has one more tooth than the inner one, and the pump displacement is determined by the space formed by the extra tooth in the outer rotor. A screw pump is an axial-flow gear pump. A typical screw pump consists of three screws, with a central-drive rotor meshing with two idler rotors inside a closed-fitting housing with no metal-to-metal contact. In the pumping process, the inlet flow is pushed uniformly through a screw pump axially in the direction of the drive rotor. Because the fluid delivered by the screw pumps does not rotate, and the rotors work like endless pistons that continuously move forward, it results in no pulsations at any speed of motor operation. These features make a screw pump operate very quietly and efficiently.
The Tribosystem Analysis Form
Published in J. Blau Peter, Tribosystem Analysis: A Practical Approach to the Diagnosis of Wear Problems, 2017
A gerotor pump consists of an eccentrically mounted spinning gear (gerotor) that traps incoming liquid (like transmission or hydraulic fluid) and pushes it out at higher pressure. The sides of the gear spin against a housing. Alternate materials with lighter weight or lower cost but with increased durability were desired for the housings. Designers had extensive computer codes available to model the wear and stresses of the gerotor teeth but could provide very little information on the pressure holding the spinning gerotor against its case.
Hydraulic Systems
Published in Anton H. Hehn, Fluid Power Troubleshooting, 1995
A gerotor pump is an internal gear pump with an inner gear and an outer gear. The inner gear has one less tooth than the outer gear. If the inner gear is turned by a prime mover, it rotates the larger outer gear. On one side of the pumping mechanism, an increasing volume is formed as gear teeth unmesh. On the other half of the pump, a decreasing volume is formed. A gerotor pump has an unbalanced design similar to a spur gear pump.
Development of CFD-based procedure for 3d gear pump analysis
Published in Engineering Applications of Computational Fluid Mechanics, 2020
Jernej Munih, Marko Hočevar, Klemen Petrič, Matevž Dular
An unstructured adaptive grid approach was used by Zhang et al. (2006) to analyze the flow and pressure ripple of a gerotor oil pump. Gerotor pump was also simulated and experimentally analyzed by Natchimuthu et al. (2010), who used a 2.5d meshing strategy. For each time step, new triangular mesh was generated first in 2d and then extruded into space. Liu et al. (2019) used the 2.5d mesh in combination with user-defined functions to simulate a crescent pump. Castilla et al. (2015) used open-source code and mesh replacement method to simulate rotary PD pump.