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Showing papers on "Gear pump published in 2007"


Journal ArticleDOI
TL;DR: A moving-deforming grid study was carried out using a commercial computational fluid dynamics (CFD) solver, FLUENT ® 6.2 as mentioned in this paper, to quantify the level of mixing of a lower-viscosity additive (at a mass concentration below 10%) into a higher viscosity process fluid for a large-scale metering gear pump configuration typical in plastics manufacturing.
Abstract: A moving-deforming grid study was carried out using a commercial computational fluid dynamics (CFD) solver, FLUENT ® 6.2.16. The goal was to quantify the level of mixing of a lower-viscosity additive (at a mass concentration below 10%) into a higher-viscosity process fluid for a large-scale metering gear pump configuration typical in plastics manufacturing. Second-order upwinding and bounded central differencing schemes were used to reduce numerical diffusion. A maximum solver progression rate of 0.0003 revolutions per time step was required for an accurate solution. Fluid properties, additive feed arrangement, pump scale, and pump speed were systematically studied for their effects on mixing. For each additive feed arrangement studied, the additive was fed in individual stream(s) into the pump-intake. Pump intake additive variability, in terms of coefficient of spatial variation (COV), was >300% for all cases. The model indicated that the pump discharge additive COV ranged from 45% for a single centerline additive feed stream to 5.5% for multiple additive feed streams. It was found that viscous heating and thermal/shear-thinning characteristics in the process fluid slightly improved mixing, reducing the outlet COV to 3.2% for the multiple feed-stream case. The outlet COV fell to 2.0% for a half-scale arrangement with similar physics. Lastly, it was found that if the smaller unit’s speed were halved, the outlet COV was reduced to 1.5%.

79 citations


Journal ArticleDOI
TL;DR: In this paper, a numerical strategy for the simulation of rotary positive displacement pumps is presented, taking as an example a gear pump, where the two gears of the pump are rotating, the intersection between them changes in time.

62 citations


Journal ArticleDOI
TL;DR: In this article, the design optimization has been carried out to determine the design parameters that maximize the specific flow rate and minimize the flow rate irregularity, and an optimally designed model for a general type of gerotor pump has been generated and experimentally verified for its pump performances.
Abstract: A gerotor pump is suitable for oil hydraulics of machine tools, automotive engines, compressors, construction, and other various applications. In particular, the pump is an essential machine element that feeds lubricant oil in an automotive engine. The main components of the pump are the two rotors. Usually, the outer one is characterized by lobes with a circular shape, while the inner rotor profile is determined as a conjugate to the other. In this study, the design optimization has been carried out to determine the design parameters that maximize the specific flow rate and minimize the flow rate irregularity. The integrated system, which is composed of three main modules, has been developed through AutoLISP, Visual Basic language, and the CAD method, and considers various design parameters. An optimally designed model for a general type of gerotor pump has been generated and experimentally verified for its pump performances. Results obtained using the system enable the designer and manufacturer of the oil pump to be more efficient in this field.

48 citations


Journal ArticleDOI
01 May 2007
TL;DR: In this article, the authors describe an extensive study of trochoidal-gear pumps, and apply the bond graph technique to simulate the instantaneous flow, taking into account different types of leakage by modelling them.
Abstract: The present paper describes an extensive study of trochoidal-gear pumps. As described in part 1 of the current paper, geometry and kinematics of trochoidal profiles and volumetric characteristics were considered to different extents. The bond graph technique was applied to model a trochoidal-gear pump based upon an ideal representation in order to simulate the instantaneous flow where the intricate aspects of leakage had been deliberately left aside. Nevertheless, leakage and interaction of the flow inside the pump are now presented in Part 2. The bond graph technique is applied to model a trochoidal-gear pump based upon a real representation in order to simulate the instantaneous flow, taking into account the different types of leakage by modelling them. Results from simulation of both models are compared and significant conclusions are obtained. The paper also examines the experimental determination of the flow ripple. A convenient method of experimentally measuring the so-called ‘secondary sour...

31 citations


Journal ArticleDOI
TL;DR: In this article, the authors propose a method of discretizing the gear tooth flank in involute segments for the determination of conjugate gear tooth profiles, which is faster than the standard theory of gearing and is particularly useful in problems requiring iterative calculations of the tooth geometry such as gear optimization.

31 citations


Patent
26 Jan 2007
TL;DR: In this paper, the turning rotary components of a rotary machine having a brake disc are provided, which includes a turning gear assembly including a gear plate, a pinion gear and a gear motor coupled to the turning gear.
Abstract: A method and apparatus of turning rotary components of a rotary machine having a brake disc includes providing a turning gear assembly. The turning gear assembly includes a gear plate, a pinion gear and a gear motor coupled to the pinion gear. The method also includes coupling the turning gear assembly within the rotary machine using the gear plate such that the pinion gear engages with the brake disc, detecting a motion of the rotary machine, and rotating the brake disc using the pinion gear based on the detected motion.

30 citations


Journal ArticleDOI
TL;DR: In this paper, the authors describe how CFD is merged with other design software by means of an integral management system to obtain interactive control of the entire design process of screw compressors.
Abstract: Positive displacement screw machines are used in variety of applications such as compressors, expanders, blowers, vacuum pumps, liquid and multiphase pumps. To improve their appearance, efficiency and robustness they are designed with the aid of analytical tools, based often on one-dimensional flow models solved by numerical methods that are confirmed by experiment. Continuing demand for further improvements has led to the need for improved assessment of fluid flow losses in the inlet and outlet openings and how these are affected by the shape of the ports, the deformation of machine components due to the effects of pressure and temperature gradients and their effect on performance, the behaviour of multiphase flows and many other effects. These require more advanced analytical procedures, based on three dimensional numerical flow analysis and fluid-structure interaction. The way to estimate these phenomena is to use CFD analysis and to integrate the results with three dimensional CAD systems. As computers become cheaper and faster and advances are made in numerical methods, such techniques are becoming available for everyday use by design engineers. This paper describes how CFD is merged with other design software by means of an integral management system to obtain interactive control of the entire design process of screw compressors. The methods described are of considerable scope and can be applied, not only to screw compressors but also to any other type of twin rotor rotary machines with parallel axes, such as gear pumps, multiphase pumps, vacuum pumps and roots blowers.

29 citations


Patent
28 Feb 2007
TL;DR: In this paper, a workover device in drill floor type, used in non-manned operation under the oil well, where it is formed by driving control room 1, thick support post 2, discharge tube 3, lifter 4, amplitude variable hydraulic cylinder 5, support post base 6, well-open hydraulic blowout preventer 7, drill floor hydraulic base 8, fixing hydraulic clamp disc 9, back tyre, back driving bridge 10, hydraulic clamper 11 with flexible sliding channel 11, hydraulic gear box 12, high pressure gear pump 13, hydraulic torque converter 14, front
Abstract: The invention relates to a workover device in drill floor type, used in non-manned operation under the oil well, wherein it is formed by driving control room 1, thick support post 2, discharge tube 3, lifter 4, amplitude-variable hydraulic cylinder 5, support post base 6, well-open hydraulic blowout preventer 7, drill floor hydraulic base 8, fixing hydraulic clamp disc 9, back tyre, back driving bridge 10, hydraulic clamper 11 with flexible sliding channel 11, hydraulic gear box 12, high-pressure gear pump 13, hydraulic torque converter 14, front tyre, front driving bridge 15, engine 16, frame and drill floor 17; the front part of frame 17 is arranged with driving control room 1, engine 16, hydraulic torque converter 14, hydraulic gear box 12 and high-pressure gear pump 13, while the back part has fixing hydraulic clamp disc 19, support post base 6, and hydraulic clamper 11; the support post base 6 is mounted with thick support post 2, discharge tube 3 and lifter 4. The invention can automatically set discharge tube and improve the working efficiency.

22 citations


Patent
20 Nov 2007
TL;DR: In this article, a continuous variable transmission (CVT) based on gearwheels is proposed, which consists of a sun gear connected to input shaft and a ring gear fixedly connected to output shaft.
Abstract: A continuous variable transmission is provided that is based on gearwheels. The novel gear acts as an efficient transmission that can replace conventional manually or automatics gears. The CVT comprises sun gear connected to input shaft and ring gear fixedly connected to output shaft. Planet gear is arranged between and engaged with the sun gear and the ring gear wherein a planet carrier that is vertically enclosing the ring gear and the sun gear is provided with a canal in which an oil pump is provided. A control valve is capable of controlling the flow of lubricant within the canal.

22 citations


Patent
05 Nov 2007
TL;DR: In this article, a crop harvesting header includes a sickle knife driven by a first hydraulic motor and a crop transfer system including three conveying drapers which are driven by at least one second hydraulic motor.
Abstract: A crop harvesting header includes a sickle knife driven by a first hydraulic motor and a crop transfer system including three conveying drapers which is driven by at least one second hydraulic motor. A mechanical drive input from the combine harvester drives a first pressure regulated piston pump generating flow for the first motor and a second gear pump for the second motor. When the drive input is driven in the reverse direction, hydraulic fluid is supplied from the second pump in the reverse direction for driving the second motor in the reverse direction. As the first pump does not pump in the reverse direction the hydraulic control circuit is arranged such that, when the second pump is driven by the drive input in the reverse direction, hydraulic fluid is supplied from the second pump to the first motor for driving the first motor in the reverse direction.

20 citations


Journal ArticleDOI
01 May 2007
TL;DR: The bond graph technique is applied to model a trochoidal-gear pump based upon an ideal representation in order to simulate the instantaneous flow and a convenient method of experimentally measuring the so-called ‘secondary source’ method is presented.
Abstract: The current paper presents an extensive study aimed at trochoidal-gear pumps. In recent years their important application in the automotive industry, where trochoidal-gear pumps are increas...

Proceedings ArticleDOI
01 Jan 2007
TL;DR: In this article, the simulation of hydraulic gear machines, focusing on the validation of simulation models and on the comparison between numerical results and experimental data, concerning both steady and unsteady conditions.
Abstract: This paper deals with the simulation of hydraulic gear machines, focusing on the validation of simulation models and on the comparison between numerical results and experimental data, concerning both steady and unsteady conditions. First authors give a brief overview on the simulation tool HYGESim, which has been presented and discussed in several previous papers. Afterwards, the attention shifts on the analysis of the simulation results for the case of a stock gear pump. Regarding steady state characteristics, the paper shows how HYGESim is able to accurately reproduce the operation of the analyzed pump, in terms of flow, pressures and efficiency maps. Regarding unsteady simulations, namely the delivery pressure ripple, the paper highlights the significant effort done by the authors in order to achieve experimental data clear and suitable for the comparison with simulation results. In fact, the peculiarities of common measuring systems (in particular of the load apparatus and the sampling methods) are often difficult to reproduce numerically: frequently different acceptable assumptions in the numerical model lead to remarkable discrepancies in simulated results. For this purpose, the authors developed a measuring device mainly focused on the easy reproducibility in the simulation environment. Furthermore, an original technique for processing unsteady data (pressure and flow ripples) is proposed, allowing to achieve comparable data indifferently of the adopted sampling method and of the data origin (experimental or numerical). In the final part of the paper, pressure ripple simulations and test results (obtained with the described measuring system and analyzed with the described technique) are presented and compared.Copyright © 2007 by ASME

Patent
24 Jul 2007
TL;DR: In this paper, a marine reduction and reverse gear unit with an output shaft disposed at an acute (or obtuse) angle with respect to an input shaft is presented, which provides a stable boat speed and enhanced acceleration performance by increasing the number of engine revolutions.
Abstract: A marine reduction and reverse gear unit having an output shaft disposed at an acute (or obtuse) angle with respect to an input shaft 7 comprises: a drive gear 15 for transmitting torque from the input shaft 7 ; first and second driven gears 30, 31 engaged with the drive gear and disposed on the right and left sides thereof to sandwich the drive gear between the first and second driven gears; a reverse gear 16 connected to the drive gear 15 via a reverse hydraulic clutch 16 ; a first forward speed gear 33 connected to the first driven gear 30 via a hydraulic clutch; a second forward speed gear connected to the second driven gear 31 via a hydraulic clutch; and an output gear 26 fixed on the output shaft and engaged directly with one of the reverse gear 16 , first forward speed gear 33 and second forward speed gear 36 , or engaged therewith via idle gears to thereby receive the transmitted torque. This marine reduction and reverse gear unit provides a stable boat speed and enhanced acceleration performance by increasing the number of engine revolutions when wakeboarding.

Patent
24 Oct 2007
TL;DR: The overall hydraulic electric forklift hydraulic system comprises the hoist oil cylinder, slanting oil cylinder formed slanting lifting device, steering device mainly made of the deflector and the steering oil cylinder as mentioned in this paper, hydraulic motor, hydraulic motor brake and its speed regulating valve.
Abstract: The overall hydraulic electric forklift hydraulic system comprises the hoist oil cylinder, slanting oil cylinder formed slanting lifting device, steering device mainly made of the deflector and the steering oil cylinder, hydraulic motor, hydraulic motor brake and its speed regulating valve. The above mentioned three devices can get hydraulic energy form a generator driven gear pump, the said gear pump generated hydraulic energy divided into two ways, one passing through the optimal valve supplying to the said steering device and several valve controlled lifting device, the other way going to the control valve and converting brake valve drive device through change-over valve. It can replace variable pump for the control of the generator gear pump through electricity, getting rid of the low efficiency, big energy consumption, high oil temperature, long time damage to the hydraulic motor, traveling, and poor brake stability.


Patent
08 May 2007
TL;DR: A drive gear includes a plurality of internal radial channels extending between the axial bore and the periphery of the gear, and an axial bearing includes a lubricant distribution structure therein to provide lubrication where the teeth of the drive gear mesh with the teeth driven by the gear as discussed by the authors.
Abstract: A drive gear includes a plurality of internal radial channels extending between the axial bore and the periphery of the gear, and an axial bore includes a lubricant distribution structure therein to provide lubrication where the teeth of the drive gear mesh with the teeth of a gear driven by the drive gear.

Journal ArticleDOI
TL;DR: In this paper, the results of an industrial research and development project aimed to develop the manufacturing technologies of gear pumps were presented, and the results were compared with those of measured in the experimental part of the work.

Patent
12 Mar 2007
TL;DR: In this article, two parallel planetary gear sets with a common sun gear output are geared to a hydraulic pump and motor system, and the output is from both planetary gears sets in parallel.
Abstract: Two parallel planetary gear sets with a common sun gear output are geared to a hydraulic pump and motor system. Input is applied to both planetary gear sets in parallel. Output is from both planetary gear sets in parallel. Two planetary gear set members, one in each set, are geared to the pump and motor and are used to control the ratio of the infinitely variable gear transmission (IVGT). The displacement ratio of the pump and motor, connected to these two members, controls the ratio of the IVGT.

24 Jun 2007
TL;DR: This gear pump analysis is one of CFD projects that have been developing in the last few years and clearly showed the phenomena regarding extremely high and low internal pressures that design engineers have encountered in the past.

Patent
26 Mar 2007
TL;DR: In this article, a fluid delivery system is described, including a patient interface device and a bulk container and pump assembly in fluid communication with the patient interface devices for supplying a medical fluid to patient.
Abstract: A fluid delivery system is disclosed including a patient interface device and a bulk container and pump assembly in fluid communication with the patient interface device for supplying a medical fluid to patient. The assembly includes a container body including a closed end and defining an opening leading to an interior chamber for holding the medical fluid, and a pump device closing and sealing the opening in the container body and adapted to draw the medical fluid from the container body and deliver the medical fluid to the patient. A method of supplying a medical fluid to a fluid delivery system is also disclosed and includes providing the bulk container and pump assembly and releasably associating the assembly with a drive device for driving the pump device. The assembly includes a pump device in the form of a gear pump including spur gears that are driven by the drive device.

Patent
20 Apr 2007
TL;DR: In this paper, a reduction gear transmission is realized in which the total speed reduction ratio is adjusted to a desired value without making any changes to a rotation direction changing gear mechanism or a speed reduction unit.
Abstract: A reduction gear transmission is realized in which the total speed reduction ratio is adjusted to a desired value without making any changes to a rotation direction changing gear mechanism or a speed reduction unit. The rotation direction changing gear mechanism comprises an input shaft and an input gear that rotates together with the input shaft, and an intermediate gear that is orthogonal to the input shaft and meshes therewith. A reduction ratio adjusting gear mechanism comprises a first spur gear that rotates together with the intermediate gear, a second spur gear that meshes with the first spur gear, and a third spur gear that meshes with the second spur gear. The speed reduction unit comprises a crankshaft that rotates together with the third spur gear and causes an eccentric cam to rotate eccentrically, an external gear that revolves orbitally while being engaged with the eccentric cam, and an internal gear that surrounds the external gear while meshing with the external gear, and that has a number of teeth differing from the number of teeth of the external gear. The reduction gear transmission is capable of changing its total speed reduction ratio by changing at least one gear out of the first spur gear, the second spur gear, or the third spur gear into another gear having a differing number of teeth.

Patent
12 Dec 2007
TL;DR: In this article, the authors propose an approach to restrict the revolution of the piston by meshing a spur gear with an internal gear fixed to a main body of a horizontal swivel part.
Abstract: When a horizontal shaft and a piston are caused to travel to a first side with a gear coupling engaging, the revolution of the piston is designed to be restricted by meshing a spur gear with an internal gear fixed to a main body of a horizontal swivel part. On the other hand, when the horizontal shaft and the piston are caused to travel to a second side and the gear coupling thus disengages, the horizontal shaft and the piston are designed to be revolved in an integrated manner by meshing spur gears respectively with other spur gears. When the horizontal shaft and the piston travel from the first side to the second side, the spur gear is designed to be spaced away from the internal gear after the spur gear meshes with the spur gear.

Patent
29 Jan 2007
TL;DR: In this paper, an apparatus and method for powering a fluid pump used in connection with drilling operations is described, which has an electric motor with a rotor that connects directly to the drive means of the fluid pump in a direct drive configuration.
Abstract: An apparatus and method for powering a fluid pump used in connection with drilling operations. The apparatus has an electric motor with a rotor that connects directly to the drive means of the fluid pump in a direct drive configuration.

Patent
22 Jan 2007
TL;DR: In this article, a double-clutch transmission system with a first and second planetary gear set is described. But the system is not suitable for the case of a single engine.
Abstract: A hydro-mechanical transmission system. The system includes an engine having a drive shaft that extends into and supplies power to a gear box having a first and second planetary gear set, wherein the first and second planetary gear set includes a sun with a first ring gear fixed and a carrier coupled to the drive shaft through a double clutch, a hydraulic pump driven by the engine and hydraulically coupled to a hydraulic motor, a low pressure accumulator coupled to the motor and the pump, a high pressure accumulator coupled to the motor and the pump, wherein the hydraulic motor couples to the suns of both planetary gear sets, wherein the engine drives the carrier of the second planetary gear set with the ring of the second planetary gear set coupled to the drive shaft through a double clutch.

Patent
24 Jan 2007
TL;DR: In this paper, a regenerative brake system and a variable displacement pump/motor for use therein is presented, with each cylinder of the pump having a main piston and a second piston between which is defined a space for hydraulic fluid, and a resilient element acting on the second piston to bias it toward the main piston.
Abstract: A regenerative brake system and a variable displacement pump/motor for use therein. Each cylinder of the pump/motor having a main piston and a second piston between which is defined a space for hydraulic fluid, and a resilient element acting on the second piston to bias it toward the main piston. Variable displacement is achieved by controlling a volume of pressurized fluid that is injected and exhausted between the main and second pistons. Brake, drive and neutral modes of operation of the pump/motor are achieved by controlling the timing (relative to a drive shaft phase) of the injection and exhaust of the fluid. Regeneration is achieved by storing pressurized fluid generated by the pump/motor in an accumulator in brake mode and using the stored pressurized fluid to power the pump/motor in drive mode.

Patent
07 Sep 2007
TL;DR: In this article, the authors describe a telescoping gear pump consisting of a bolt, a Bellville washer, a wear plate, a seal housing, a sealing spring, and a spur gear.
Abstract: A telescoping gear pump comprises a bolt, a Bellville washer, a wear plate, a seal housing, a seal spring, a spur gear including a wear lobe, a seal ring and a case drain path, a shaft, a ring gear including a wear lobe, seal ring, and a case drain path, seal, a bolt assembly including a Bellville washer and bolt, and a pressure plate. The assembly provides pressure to a fluid to maintain a seal within a telescoping pump/motor during operation. The wear lobe reduces wear while maintaining fluid pressure.


Patent
29 Mar 2007
TL;DR: In this article, an oscillating internally meshing planetary gear reducer capable of realizing a low cost and a high speed reduction ratio is presented. But the reducer is not suitable for high speed applications.
Abstract: To provide an oscillating internally meshing planetary gear reducer capable of realizing a low cost and a high speed reduction ratio, the oscillating internally meshing type planetary gear reducer is constituted so as to include: an input shaft provided with an input gear which is circumscribed and meshed with a pinion provided on a motor; an input shaft gear formed on the input shaft; a plurality of eccentric body shafts each provided with an eccentric body for oscillating an oscillating external gear; an eccentric body shaft gear which is formed on each eccentric body shaft; and a distributing gear which is meshed with the input shaft gear and the eccentric body shaft gear.

Patent
15 Aug 2007
TL;DR: In this paper, a three-phase gear pump in which the bearing losses in the bearings for supporting the rotation shafts of the two driven gears are easily and surely reduced can be provided.
Abstract: A three-throw gear pump (2) comprises a drive gear (20), two driven gears (21, 22) so disposed as to face each other on both sides of the drive gear (20), a first bearing (36) for supporting the drive shaft of the drive gear (20), and second and third bearings (37, 38) for supporting the rotation shafts of the two driven gears (21, 22). The bearing length of the first bearing (36) is shorter than the bearing length of each of the second and third bearings (37, 38). Thereby, the three-phase gear pump in which the bearing losses in the bearings for supporting the gears are easily and surely reduced can be provided.

Patent
13 Mar 2007
TL;DR: In this article, a hydraulic pump and a hydraulic motor are connected over two control lines and a storage unit is provided for storing brake energy, and is connectable with either the control line or the control unit.
Abstract: The drive has a hydraulic pump (9) and a hydraulic motor (12) connected over two control lines (10, 11). A storage unit (21) is provided for storing of brake energy, and is connectable with the control line (10) or the control line (11). The hydraulic pump and the hydraulic motor are mechanically connected with an output shaft (18). A power branching transmission (1) has a planetary gear (13) . The hydraulic motor is connected with a motor unit of the planetary gear and the hydraulic pump is connected with another motor unit of the planetary gear.