Showing papers on "Gear pump published in 2009"

Electronic control for a hydraulically driven auxiliary power source

Abstract: A hydraulic system includes a variable displacement hydraulic pump connectable to a power source, a hydraulic motor, a fluid circuit, a pump displacement control, and a controller. The pump has an inlet for receiving fluid, an outlet for discharging pressurized fluid, and a pump displacement input. The motor has an inlet for receiving pressurized fluid and an outlet for discharging spent fluid. The fluid circuit includes a supply conduit for conducting fluid discharged by the pump to the motor and a return conduit for returning fluid discharged by the motor to the pump. The pump displacement control cooperates with the pump displacement input to vary pump displacement. The controller communicates with the pump displacement control to control the pump output such that the motor is driven at a constant speed to thereby drive a generator connected to the motor at a constant speed despite speed fluctuations of the power source.

Gear box for hydraulic energy recovery

Abstract: A hydraulic energy recovery and a mechanical drive system in one unit that also provides integral mounting of hydraulic pump/motors for primary drive, secondary drive, and pumps for cooling, lubrication, and low pressure systems along with a mounting position for a power take-off device.

GEROLAB Package System: Innovative Tool to Design a Trochoidal-Gear Pump

Abstract: An innovative tool for the improvement of the design methodology of a trochoidal gear, which works as a part of a hydraulic pump, is introduced. For the past few years, new, specific, and demanding applications of this type of pumps have demanded to maximize efficiency and to reduce manufacturing costs by improving its two main performance indexes: volumetric characteristics and teeth contact stress. The existing methodologies and software fail to thoroughly address the design by taking into account both performance indexes. The software presented is an integrated package system, which is composed of three basic modules: design, volumetric characteristics, and contact stress module. As a result, by consecutively following each module, this new tool allows to find the better gear set for the concrete initial required design parameters. An application using the GEROLAB package system methodology is carried out to obtain the best candidate, which is compared and contrasted with a gear set of a specific gerotor pump unit. As a conclusion, this new software aims to lead the designer to a better design by improving performance indexes of a new born gerotor pump project.

Fuel delivery and control system including a variable displacement actuation pump supplementing a fixed displacement main pump

Abstract: A fuel delivery and control system is provided including a dual pump fluid circuit configuration comprising a fixed positive displacement pump sized to supply the main engine burn flow ranging from above windmill through cruise and a variable displacement pump sized to supply fluid to engine actuators, valves and other hydraulically operated engine components with a pump flow sharing system interconnecting the two pumps. The combined flow from the two pumps is sufficient to meet the engine flow demand for windmill relight and maximum flow conditions. During cruise or normal operating conditions, the pumps operate in completely isolated flow circuits, minimizing recirculation and therefore heat input into the fuel supply system.

Torque balancing gearbox

Abstract: A gearbox comprising a gearset is able to transmit high output torques at high numerical reduction ratios at a power-to-weight ratio higher than previously attainable with existing designs. A distributor gear is disposed relative to a spur gear in order to produce automatic torque balancing. The distributor gear can be advantageously configured as an input floatring gear, for which support in all directions is provided by gear tooth mesh forces rather than bearings. Automatic torque balancing is achieved by configuring the distributor gear with first and second rows of helical teeth on the external circumference, and with a set of double helical teeth disposed on the internal circumference of the distributor gear. This allows for the placement of up to 50 or more planet gears in a countershaft arrangement with one end having helical teeth and the other end having spur teeth.

Rotor profile design in a hypogerotor pump

Abstract: A geometric approach for the outer-rotor profile as a conjugate to the inner-rotor in a hypotrochoidal rotor pump (hypogerotor pump) is proposed by means of the principle of the instantaneous center and the homogeneous coordinate transformation. The inner-rotor profile is defined by the combination of two circular arcs. Next, the radius of curvature of the outer-rotor is derived with the relationships of the trochoid ratio and the inner-rotor tooth size ratio. Then by examining the minimum radius of curvature of the extended hypotrochoidal outer-rotor profile on the convex section, an explicit formula to avoid undercutting in the hypogerotor pump is proposed. It is found that undercut or self-intersection does not occur so long as the minimum value of the radius of curvature on the convex section is not less than zero. Design examples are presented to simulate the operation and to demonstrate the feasibility of the approaches using a computer-aided design program developed on C++ language.

Experimental apparatus and method for obtaining multi-source diagnostic information of hydraulic equipment

Abstract: The invention relates to an experimental device and an experimental method for multi-source information fusion for fault diagnosis of a hydraulic device. The device comprises the following elements: a variable plunger pump, a gear pump, two motors, two suction filters, five throttle and stop valves, two electromagnetic relief valves, an electromagnetic proportional relief valve, two pressure meters, an energy accumulator, two sets of combined sensors, a three-position four-way electromagnet directional valve, a hydraulic motor and a cooler. The experimental device can simulate eight typical running states (faults) of the hydraulic device, including low efficiency, oil and liquid pollution, air suction, leakage, oil pump fault, relief valve failure, motor failure and mechanical failure and can perform cluster analysis and fusion diagnosis to characteristics of the eight faults through a self organizing maps neural network.

Fuel delivery and control system including a positive displacement actuation pump with a variable pressure regulator supplementing a fixed displacement main fuel pump

Abstract: A fuel delivery and control system is provided including a dual pump fluid circuit configuration comprising a fixed positive displacement pump sized to supply the main engine burn flow ranging from above windmill through cruise, a positive displacement actuation pump including a variable pressure regulator, wherein the actuation pump is sized to supply fluid to engine actuators, valves and other hydraulically operated engine components and a pump flow sharing system interconnecting the two pumps. The combined flow from the two pumps is sufficient to meet the engine flow demand for windmill relight and maximum flow conditions. During cruise or normal operating conditions, the pumps operate in completely isolated flow circuits, minimizing recirculation and therefore heat input into the fuel supply system.

Variable speed and displacement electric fluid delivery system for a gas turbine engine

Abstract: A fluid delivery system in a gas turbine engine includes an electric motor, a first fluid pump system and a second fluid pump system. The electric motor operates at a variable speed. The first pump system includes a first pump driven by the motor to deliver a first fluid to the gas turbine engine. The second pump system includes a second pump driven by the motor to deliver a second fluid to the gas turbine engine, the second pump having a variable displacement.

Hydraulic fluid supply device and electrical actuator

Abstract: An electric actuator (1) of the present invention includes: a hydraulic fluid supply device (10), and an actuator (20) actuated in response to an input of hydraulic fluid from the variable-volume pump (12). The hydraulic fluid supply device (10) includes: an adjustable-speed motor (11); the variable-volume pump (12) which is driven by the adjustable-speed motor (11) and ejects hydraulic fluid; an electric motor control unit (13) which controls the adjustable-speed motor (11) so as to achieve an intended rotation speed; and a pump control unit (14) which controls the variable-volume pump (12) so that the ejection volume of the variable-volume pump (12) decreases with an increase in the ejection pressure of the variable-volume pump (12).

Gas well dewatering system

Abstract: Power and control logic configurations for gas well dewatering systems are provided. In one example, a reservoir is configured to contain hydraulic, lubricating fluid. An electric motor is configured to receive fluid from the reservoir for lubrication and a hydraulic pump powered by the electric motor is configured to receive fluid from the reservoir and pump the fluid into a hydraulic circuit. A positive displacement oscillating pump is powered by the hydraulic pump and configured to pump fluid from the reservoir to an outlet from the well. The electric motor and hydraulic pump receive the same fluid from the reservoir for lubrication and to create pressure in the hydraulic circuit, respectively. A switching device is connected to the hydraulic circuit and is switchable between a first position wherein fluid pressure from the hydraulic pump causes the piston pump to move in a first direction and a second position wherein fluid pressure from the hydraulic pump causes the piston pump to move in a second direction.

Valveless liquid dispenser

Abstract: An apparatus includes a valveless cartridge assembly that has a housing with an opening at a proximal end and an outlet port for dispensing the liquid at a distal end, with the opening being configured to accept a cartridge of the liquid therethrough and communicating with an interior space of the housing. A metered dispensing device is coupled to the valveless cartridge assembly and includes a positive displacement pump in fluid communication with the interior space and the outlet port for selectively dispensing the liquid through the outlet port. The apparatus may be such that at least a portion of the metered dispensing device is disposed within the housing or it may alternatively be coupled to an exterior of the housing. The positive displacement pump may be a gear pump.

Internal gear pump rotor, and internal gear pump using the rotor

Abstract: A gear pump rotor is provided including a combination of an inner rotor and an outer rotor whose numbers of teeth are different by one, and the discharge amount of the pump is increased by an increase of the tooth depth. At least one of an addendum curve and a dedendum curve of an inner rotor is formed by a locus of one point on formation circles that satisfy moving conditions that the formation circles move from moving start points to moving end points while changing the distances from an inner rotor center to the centers of the formation circles. The centers of the formation circles move by a distance in the radial direction of a base circle, and the formation circles rotate by an angle at a constant angular velocity in the same directions of the moving directions of the formation circles.

Electro-hydraulic driver of control valve

Abstract: The invention provides an electro-hydraulic driver of a control valve, which comprises a hydraulic driving system, a pressure sensor, a flow sensor, a position sensor and a control unit; wherein, the hydraulic driving system is used for driving a valve core of the control valve and comprises a bidirectional driving cylinder, a directional control valve, a three-position four-way reversing valve, an energy accumulator, a servo motor and a bidirectional gear pump; the pressure sensor and the flow sensor are installed on a fluid output pipeline, are used for detecting the pressure and the flow of the output fluid in the pipeline and are connected with the control unit; the position sensor is used for detecting the valve core position of the control valve to be controlled and is connected with the control unit The electro-hydraulic driver realizes that hydraulic oil can flow out of an oil outlet cavity and directly enter an oil inlet cavity without passing through an oil tank, and has simple and compact structure; the motor and the oil pump do not need to continuously run but operate intermittently, which can not only save energy but also prolong the service life of the system, thus realizing stable operation for extra-long time and quick response of the control valve with high reliability

Tooth profile for rotors of positive displacement external gear pumps

Abstract: The present invention deals with the analytical definition of a tooth profile for rotors used in gear pumps. The purpose is to obtain a pump characterised by noiseless operation, minimisation of vibrations and pressure overoscillations generated in operating conditions at the beginning and end of life, and high specific displacement, in such a way to increase the delivery of the pump in given volume conditions. This profile is characterised by an active profile of the tooth flanks with involute stub-tooth with transverse contact ratio (et) comprised in the range from 0.4 to 0.45, helical teeth with helical contact ratio (eβ) comprised in the range from 0.6 to 0.85, circular inactive tooth bottom and top profiles, with centre (Of, Ot) and radius (rf, rt) defined by a non-dimensional parameter ζ in the range from 1.1 to 1.6.

Radial piston pump for providing high pressure fuel supply in common rail injection system of internal-combustion engine, has low pressure channel provided in distributor element, where channel hydraulically connects pump element with inlet

Abstract: The pump has a pump element arranged radially with respect to a drive shaft (3) that is supported in a pump housing (1), where the element is actuated by the shaft and a fuel inlet (21). A distributor element (17) is arranged on the housing and a low pressure channel (24) is provided in the distributor element. The channel hydraulically connects the pump element with the inlet. A return flow connecting piece (47), return channel (45), suction control valve (23), internal gear pump, and/or single- or two-stage overflow valve are integrated in the distributor element.

Method for molding green tire

Abstract: PROBLEM TO BE SOLVED: To provide a method for molding a green tire which supplies a sufficient amount of a rubber material to a gear pump irrespective of the delivery capacity of the gear pump and does not cause the problem of product quality. SOLUTION: When ribbon-shaped unvulcanized rubber strips are wound overlie a molding drum to mold the green tire, texture rubber 5 supplied through the refining process is charged in a warming cold tuba 1, and warmed rubber material is extruded from a nozzle 8 while foreign matters in the rubber are removed. The extruded rubber material 9 is supplied to the gear pump 3 through a temperature-adjusted conveyer 2, and the ribbonlike rubber strips 13 which are discharged from the gear pump 3 and molded are wound onto the molding drum 4 to overlie it. COPYRIGHT: (C)2009,JPO&INPIT

Experimental Procedure for Measuring the Energy Consumption of IC Engine Lubricating Pumps during a NEDC Driving Cycle

Abstract: The paper presents an experimental procedure for comparing different families of IC Engine lubricating pumps in terms of total consumed energy in a NEDC driving cycle. Measures are performed on a test rig able to reproduce the oil temperature profile, the lubrication circuit permeability and its variation during the engine warm-up. The pump under test is driven by a variable speed electric motor supplying the engine velocity profile of the driving cycle. The load on the pump is generated by means of a variable restrictor controlled in a closed loop by a proper combination of speed, temperature, flow rate and pressure signals in order to replicate the typical permeability of the lubricating circuit. The method has been applied to a 15 cc/rev crankshaft mounted gerotor pump for a medium displacement Diesel engine; the flow-pressure characteristics of the lubricating circuit at different temperatures and the oil heating rate measured on the engine have been supplied to the test rig control system. The reference pump has been contrasted with a crankshaft mounted variable displacement vane pump with absolute pressure limiter device and an off-axis external gear pump with the same displacement and pressure setting. Experimental tests bring to evidence the advantage of the variable displacement pump during short trips with cold start, while the external gear pump prevails at the end of NEDC cycle where highest engine speeds and oil temperatures are reached.

Dual chamber and gear pump assembly for a high pressure delivery system

Abstract: A high pressure delivery device for delivering a medicament includes a first chamber for storing a supply of the medicament and a second chamber in fluid communication with the first chamber A fluid connection path is in fluid communication with the second chamber for administering the medicament A valving system is in fluid communication with the first chamber, the second chamber and the fluid connection path The valving system allows a dose of the medicament to be injected from the first chamber into the second chamber while substantially preventing backflow of the dose into the first chamber and substantially preventing leakage through the fluid connection path The valving system also allows the dose in the second chamber to be administered through the fluid connection path while substantially preventing the dose from flowing back into the first chamber

Displacement clamper for processing gear pump cavity hole

Abstract: The invention relates to equipment for machining a cavity hole of a gear pump, in particular to a transposition clamp for machining the cavity hole of the gear pump, which is used for machining in a numerical control machine The transposition clamp is characterized by comprising a turnplate, a chassis, a central distance adjustment mechanism and a mainshaft connecting disc, wherein the turnplate is provided with a clamping mechanism for clamping a workpiece; the turnplate can rotate for 180 degrees round the center; the chassis is arranged on the mainshaft connecting disc, is clamped on a guide key and is used for supporting and positioning the turnplate; the central distance adjustment mechanism is used for adjusting a deflection value X between a rotary centerline of the turnplate and a rotatory centerline of a clamp body; the chassis is fastened on the mainshaft connecting disc through a bolt; and the guide key is also arranged on the mainshaft connecting disc and is used for positioning and mounting the chassis The turnplate does circumferential rotation and is positioned by a bolt; after one cavity hole is machined, the bolt is drawn out; and when the turnplate rotates for 180 degrees round a central shaft, another cavity hole is machined When the central distance is needed to adjust, a fastening bolt is loosened; the bolt on the chassis is adjusted; and the central distance is adjusted along the movement of the chassis on the guide key The transposition clamp improves the machining precision of the cavity hole of the gear pump and the production efficiency

Device for manufacturing a rubber strip material

Abstract: Device for manufacturing a rubber strip material comprising cord material. The device comprises an extruder with an integrated gear pump with adjustable pump speed and with a conveying screw for extruding unvulcanised rubber around the cord material for the purpose of producing a continuous rubber strip. The device furthermore comprises a control unit for adjusting the pump speed of the gear pump, a measuring unit for measuring the height and the width of the rubber strip and for emitting a measuring signal indicative of the measured height and width. The measuring unit can be connected to the control unit for adjusting the pump speed of the gear pump for emitting the measuring signal to it, wherein the pump speed of the gear pump can be controlled by the control unit at least based on the measuring signal.

Gear transmission and photovoltaic power-generating apparatus using the gear transmission

Abstract: A gear transmission comprises a crankshaft that eccentrically rotates one of an internal gear and an external gear. A first gear is attached to one end of the crankshaft. A ring gear having internal teeth meshes with the first gear. An intermediate gear meshes with external teeth of the ring gear. A second gear is attached to one end of an output shaft of a motor and meshes with the intermediate gear. The motor and the crankshaft are positioned, relative to the intermediate gear, on the same side in the axial direction of the gear transmission.

Optimization of the Polymer Foam Process by the Residence Time Distribution Approach

Abstract: In this work, we used the residence time distribution to study the polystyrene foaming during an extrusion process. The extruder associated with a gear pump is simply and quantitatively described b...

High-pressure gear pump with pressure compensation function

Abstract: The utility model provides a high-pressure gear pump with pressure compensation function. The gear pump adopts a two-sheet structure; a progressive seal groove is formed on the back surface of a floating side plate; a small hole is formed at the middle part of the groove; the high-pressure zone of the floating side plate communicates with the progressive seal groove via the small hole; the progressive seal groove is a W-shaped groove with gradually-changed width; and a W-shaped seal ring and a W-shaped supporting plate are arranged inside the groove. Accordingly, the compensating compaction force on the back surface of the floating side plate is slightly larger than the push force of the front high-pressure oil on the floating side plate, so as to allow the floating side plate to uniformly adhere to the gear end surface with a smaller compaction force all the time, compensate the clearance at any time, prevent the burning due to the reduction in mechanical efficiency, and protect the surface of the floating side plate against the eccentric wear due to the non-uniform stress. The high-pressure zone is enlarged. The oil inlet/outlet is deviated towards the driving gear. The bearing with larger convexity at both ends is adopted to reduce and balance the radial force, thereby improving the working environment of the bearing and increasing the service life of the gear pump.

Process and device for cold extrusion forming of gear pump main shaft

Abstract: The invention discloses a process and a device for the cold extrusion forming of a gear pump main shaft. The manufacturing technique of the main shaft is innovated so that the production becomes simple and convenient, the precision and the quality of products are improved, the environmental pollution is reduced, and the cost is reduced. The process for the cold extrusion forming of the gear pump main shaft comprise the following steps: firstly, performing sectioning, surface coarse grinding forming, two-end blunt end cutting and surface granosealing on a rod material; secondly, putting a blank rod section after processing into a cold extrusion forming die, and extruding two ends of the blank rod section by a pressure machine so that the blank rod section generates plastic flow and enters an upper and a lower die gear forming die block for forming; thirdly, propping out a semi-finished product of the gear pump main shaft to finish the surface coarse grinding forming, the blunt end cutting for the end faces of two gear sections, positioning slot turning and keyseat turning; and finally, performing carburizing heat treatment, coarse grinding and precision grinding on the surface of the main shaft so that the main shaft reaches a design specification.

Experimental Study of the Shaft Motion in the Journal Bearing of a Gear Pump

Abstract: The movement of the shaft of a driven gear in a gear pump is experimentally studied. Three different methods are considered, and the use of a laser micrometer measurement method is validated. In order to use the laser micrometer, some modifications are made to the gear pump. Experimental results for different working pressures and rotational velocities are shown. For a low nondimensional working pressure, defined in a similar way as the Sommerfeld load, experimental and numerical results agree very well for relative eccentricity. Nevertheless, experimental results made clear that the role of the lateral plate of the pump is very important for high nondimensional working pressure. A value of 100 is given for the critical nondimensional working pressure in order to avoid wear and slant in the lateral plate. Frequency analysis of the outlet pressure, as well as the precise measurement of the wear in the pump case, support experimental observation of the inability of the journal to retain the shaft for high nondimensional pressure.

Geometric displacement optimization of external helical gear pumps

Abstract: An approach to geometric displacement optimization of external helical gear pumps is presented. In addition, relations of pump flow property and its influence factors are also investigated. During that, only the pumps with transverse contact ratios of not less than one are discussed. First, using the involute property, an analytic representation for flowrates is deduced, by which displacements and fluctuation coefficients of helical gear pumps can be calculated accurately and efficiently. Then, by incorporating several design considerations, optimization problems for maximum geometric displacement are formulated and solved integrally by an optimization code, Multifunctional Optimization System Tool, with which various types of design variables including real, integer, and discrete can be simultaneously dealt with. Finally, the desired pumps with optimal displacement can be obtained. The proposed approach facilitates the design optimization of helical gear pumps. Moreover, influences of design para...