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Engine systems
Published in Tom Denton, Automobile Mechanical and Electrical Systems, 2018
The oil pump is the heart of the system. It pumps oil from the sump into the engine. The main types of oil pump are gear, rotor, gerotor, vane and crescent. The gear type uses two gears in mesh with each other (Fig. 2.128). Drive is made to one gear which, in turn, drives the other. The housing has a figureof-eight internal shape, with one gear in each end. Ports are machined in the housing and align with the areas where the teeth move into, and out of, mesh. As the teeth separate, the volume in the inlet side of the housing increases and atmospheric pressure in the sump is able to force oil into the pump. The oil is carried around inside the pump in between the teeth and the side of the housing. When the teeth move back into mesh, the volume in the outlet side of the housing is reduced, the pressure rises and this forces the oil out into the engine.
Application of Lubricants
Published in Don M. Pirro, Martin Webster, Ekkehard Daschner, Lubrication Fundamentals, 2017
Don M. Pirro, Martin Webster, Ekkehard Daschner
The system illustrated in Figure 9.15 is fairly typical of the third type of circulation system. The returning oil drains into a settling compartment and enters the reservoir at or just above the oil level. Water and heavy contaminants settle, and the sloping bottom of the reservoir helps to concentrate these impurities at a low point from which they can be drained. This oil flows over a baffle plate to the clean oil compartment side of the reservoir. In some large reservoir systems, the baffles may be omitted as the contaminants will naturally settle because of the huge oil volume. The oil pump takes the oil through a suction strainer and then pumps it to an oil cooler, usually through oil filters, and then to bearings, gears, and other lubricated parts. The pressure desired in the oil supply piping is maintained via a relief valve that discharges it to the reservoir at a point below the oil level. A continuous bypass purification system is shown in Figure 9.15. A separate pump takes 5% to 15% of the oil volume in circulation from a point above the bottom of the reservoir where contaminants settle out and pumps it through a suitable filter back to the clean oil compartment. The following discussion of good practices in circulation system design refers primarily to systems of this type, but the ideas presented are fundamental to most systems.
Vehicular Engines
Published in G. K. Awari, V. S. Kumbhar, R. B. Tirpude, Automotive Systems, 2021
G. K. Awari, V. S. Kumbhar, R. B. Tirpude
In this system, oil is supplied from an external tank. The oil pump draws oil from the supply tank and circulates it under pressure to various bearings of the engine. The oil dripping from the cylinders and bearings into the sump is removed by a scavenging pump and is returned to the supply tank through the filter. The capacity of the scavenging pump is greater than the oil pump. A separate oil cooler is used to remove heat from oil using either air or water (Figure 3.13).
Fixed displacement gerotor oil pump (FDOP): a survey
Published in International Journal of Ambient Energy, 2022
V.T. Gannesh, R. Sivakumar, G. Sakthivel
In this survey report the research studies carried out in the gerotor oil pump for the last five decades are captured and are grouped under 6 categories namely profile and its effect, effect of tip-to-tip /tip /teeth clearance, axial/face to face and radial clearances, effects of porting and relief groove, one-dimensional analysis for the gerotor pump, gerotor and CFD usage and gerotor and its technology. Profile and its effect has a major impact on volumetric efficiency since the pocket volume of gerotor is totally based on the profile of the gerotor. Clearance has a direct impact on the volumetric efficiency of the oil pump. When the clearance increases, it decreases the volumetric efficiency and vice versa. Porting and relief groove have an indirect effect on volumetric efficiency. A decrease in port depth and improper shape of port lead to a reduction in volumetric efficiency. 1D tool and computational fluid dynamics (CFD) techniques are used to simulate the oil pump design virtually. Both are used to simulate and validate the oil pump design which saves the lead time of development and avoids the number of iteration in proto-states. The final category is the gerotor and technology in which new concepts of the gerotor oil pump emerged in the last five decades are covered briefly with their benefits and drawbacks.
Latest technologies and novel approaches in coal seam gas centrifugal compressor trains in Australia
Published in Australian Journal of Mechanical Engineering, 2019
Preferred starting device is electrohydraulic one; this is an electric motor drives a hydraulic pump, which in turn transmits hydraulic power to start the gas turbine. In other words, the hydraulic pump (most often a gear pump) usually drives a hydraulic motor; the driver for the hydraulic oil pump is usually an electric motor. The hydraulic concept can result in a very effective and soft start capability. Other starter systems (direct electric motor, etc.) will result in more issues and problems. However, it never means any hydraulic system works properly and trouble-free. In case of any problem with such a system, the root-cause of issues and problems should be identified and eliminated.
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.