Showing papers on "Gear pump published in 1996"

Gear throttle as a nucleation device in a continuous microcellular extrusion system

Abstract: Disclosed herein is an improvement in microcellular or supermicrocellular polymer extrusion systems. Both conventional and microcellular systems employ an extruder which plasticates polymer pellets into a polymer melt; a gas metering system, whereby a gas is injected directly (32) in the polymer melt flow in the extruder; a mixing and homogenizing section of the extruder, which creates a single-phase solution of the polymer and the gas; and a nucleation device (55) at the outlet end of the extruder. In this invention, the improvement to the conventional system comprises the nucleation means attached to said extruder which is a gear pump acting as a throttle rather than a pump. With this improvement, the discharge pressure is dictated by die resistance and flow rate as delivered by the gear throttle, and the pressure drop of the polymer/gas single-phase solution is nearly instantaneous.

Tandem, swash plate pump having drive force take-out mechanism

Abstract: A tandem, swash plate-type hydraulic pump in which a drive force transmission system for extending one or more hydraulic pumps and a structure relating to the system can be made simple and light, and one or more hydraulic pumps even when extended can be compactly arranged without increasing the axial length of the pump unit. A drive force take-out mechanism for taking outward part of a driving force out of a spline sleeve member of a spline coupling which is an intermediate coupling of a tandem, swash plate-type hydraulic pump. A first gear is connected with a spline sleeve member and a gear box. The gear box is composed of an intermediate gear, a driven gear, a spline sleeve member, and a gear case for rotatably housing these components. The gear box is removably fixed to an intermediate block and provided on both surfaces of the gear case are pump mounting portions for mounting hydraulic pumps which may be added as appropriate. Suction and discharge channels are disposed vertically in the mounting direction of the drive force take-out mechanism.

Involute Gear Pumps Versus Lobe Pumps: A Comparison

Abstract: In previous studies we have considered several types of positive displacement rotary pumps and deeply analyzed the generation of the flow rate and the design limits. This has been done in order to evaluate the main performance indexes; one of which, the flow rate irregularity, is related to the possibility that the pump becomes a source of vibration and noise. A second index is the specific flow rate, related to the delivery capacity of the pump. In this paper, following our previous researches, we analyzed internal involute gear pumps and internal lobe pumps, that have similar operations but different performances. The design parameters and the way to optimize the performances are proposed for both cases. Finally a comparison is made between the two types of pumps with optimum design parameters.

Trochoidal tooth gear assemblies for in-line mechanical power transmission, gear reduction and differential drive

Abstract: Trochoidal tooth form gear assemblies for in-line mechanical power transmission, gear reduction and differential drive employ internally meshed gear sets having differing numbers of trochoidal gear teeth, all of which are in continuous contact as one gear rotates and orbits relative to another. Coupling and output rotors having external trochoidal gear teeth profiles rotate and/or orbit in mesh with conjugate internal trochoidal gear teeth in stators or coupling rotors. A differing number of teeth between the meshed external and internal gear teeth provides gear reduction of rotational speeds through axially aligned input and output shafts. In certain embodiments, couplers are eccentrically mounted upon axially extending pins to translate the orbital motion of a meshed gear to shaft rotation. The gear sets can be combined in series to provide various gear reduction ratios as functions of the differing number of meshed gear teeth. In a differential transaxle trochoidal gear assembly, coupling rotors having internal and external gear teeth are eccentrically mounted back-to-back 180° out of phase within a single internally-toothed ring gear to rotate in unison at constant speed rotation of the axles and in opposite directions upon differential axle speeds. Hypotrochroidal gear tooth forms are also described.

Fluid pump with bearing set having lubrication path

Abstract: A gear pump (10) is disclosed having an integrated gear cavity (40) and bearing receptacle (54) that includes a fluid path for lubricating the bearings (24a, 24b). The preferred embodiment includes a helical gear pump (18, 20) having a manifold (14) with inlet (46) and outlet (48) ports. The integrated gear cavity and bearing receptacle are located in a one piece molded end cap (12). The bearing receptacle receives a coupled bearing assembly (24). Together, the coupled bearing assembly and the bearing receptacle define a supply path (58) outside the bearings along the bearing receptacle and a return path (60) through the bearings so that fluid can pass by, and lubricate, the bearing-axle (26, 28) interface.

Charge pump and auxiliary pump for hydrostatic transmissions and integrated hydrostatic transaxles

Abstract: A hydrostatic transmission. The hydrostatic transmission generally comprises a sump containing hydraulic fluid, a charge pump in flow communication with the sump for creating high pressure hydraulic fluid from the hydraulic fluid, a center section having hydraulic porting formed therein, a hydraulic pump, a hydraulic motor drivingly connected to the hydraulic pump through the hydraulic porting, and a manifold defining a gallery for storing the high pressure fluid. The gallery is in flow communication with the charge pump and the hydraulic porting.

Liquid fuel pressurization and control system

Abstract: A liquid fuel pressurization and control system is disclosed which utilizes either a helical flow pump, or a helical flow pump followed by a gear pump, to pressurize liquid fuel to precisely the pressure level required by a turbogenerator's combustor injectors. This eliminates the need to overpressurize the fuel then regulate the fuel pressure down using a flow control valve or a pressure control valve. The shaft torque and shaft speed of the pump are controlled by the turbogenerator's power controller so as to assure that the turbogenerator's speed is precisely controlled (e.g. within ten (10) rpm out of one hundred thousand (100,000) rpm), and that its turbine exhaust temperature is precisely controlled (e.g. within two (2) degrees Fahrenheit out of twelve hundred (1200) degrees Fahrenheit) over the full range of turbogenerator electrical output power. The system also provides cool, high pressure air to assist atomization of the liquid fuel in the injectors utilizing a variable speed helical flow compressor. The system also adjusts the relative fuel flow through the multiple fuel injectors to aid flame stability at low turbogenerator speeds and low output power levels.

Hydraulic bicycle with conjugate drive motors

Abstract: A device for transmitting power between mechanical movements which includes a fluid pump coupled to a first mechanical movement for pumping a fluid, a fluid motor coupled to a second mechanical movement and a manifold connecting the fluid pump and the fluid motor capable of conducting fluid output from the fluid pump to the fluid motor to drive the fluid motor and recirculate the fluid back to said fluid pump. Either the fluid pump and/or the fluid motor incorporates a conjugate drive motion translator. The power transmission is suitable for use on a bicycle replacing the typical gears and chain and preferably includes a shunt to permit the motor to override the pump, an apportionment valve to control the ratio of movement between a first and second mechanical movement, and a brake valve for stopping the second mechanical movement.

Group of full-circumferential-flow pumps and method of manufacturing the same

Abstract: A group of full-circumferential-flow pumps has a group of motors each comprising a main shaft, a rotor mounted on the main shaft, a stator disposed around the rotor, a cylindrical outer motor frame fitted over the stator, and an outer cylinder disposed around the cylindrical outer motor frame with an annular space defined therebetween, a group of pump parts oriented in opposite directions to meet different directions in which the main shafts of the motors rotate, and a group of frequency converters for energizing the motors to rotate at high speeds In order to meet rating requirements including flow rates and pump heads, the group of motors, the group of pump parts, and the group of frequency converters are combined to provide a group of single-suction-type full-circumferential-flow pumps that are powered by a commercial electric power supply and belong to a first type for applications to pump a fluid at a small rate under a low pump head, and a group of single-suction-type full-circumferential-flow pumps that are rotatable at high speeds and belong to a second type for applications to pump a fluid at a small rate under a high pump head

Gear pump with minimized canitation

Abstract: The invention relates to a gear pump with two delivery gears meshing with one another, said gears cooperating in the rotation direction in front of or behind a plane containing the gear axes with a pressure and/or suction line. According to the invention, excess delivered pumping medium is introduced through a separate line behind the connection of the suction line in the circumferential direction of the gears, into the tooth spaces of the delivery gears in order to prevent any cavitation that might occur.

Compliant drive for printing presses

Abstract: A complaint drive for use in a printing press. The compliant drive is coupled to a driving gear which can be on the plate cylinder of the printing press. The compliant drive includes an input gear meshing with the driving gear. A compliant coupling is connected between the input gear and a first output gear. The compliant coupling includes circumferentially-spaced compression springs between the input gear and the first output gear. The first output gear can drive a driven gear which in turn drives a vibrator in a dampener. The first output gear can also drive a second output gear. Each of the input gear, first output gear and second output gear are mounted on rolling contact bearings, which improves efficiency of the drive and, with the compliant coupling, prevents transmission of transient forces, shocks or vibrations to the plate cylinder, thereby eliminating doubling of the printed images.

Integrated gear pump dispenser for robotic dispensing

Abstract: The present invention provides a robotic dispensing apparatus comprising a gear pump operably coupled to a rotatable element positioned along the sixth axis of a multi-axis robot such that the gear pump is driven by the multi-axis robot. In one embodiment of the present invention, a sixth axis motor of the multi-axis robot drives the rotatable element and a dispense valve communicates with the gear pump for receiving and dispensing viscous material from the gear pump. Preferably, a flexible coupling interconnects the gear pump and the rotatable element and a manifold and piping system cooperate to deliver the viscous material pumped by the gear pump to the dispense valve.

high pressure double gear pump

Abstract: The utility model relates to a high pressure double gear pump, which is characterized in that an oil inlet 18 is communicated with an oil passage 19 on a front pump body. An oil passage 24 on an intermediate body 4 and an oil passage 26 on a rear pump body are communicated with the low pressure sides of the front pump body and the rear pump body, and two end surfaces of the intermediate body are respectively provided with a seal groove 21 and a circular oil groove. A return chute 23 is arranged between a positioning hole 22 on the intermediate body and the shaft hole 25 of a driven gear. The high pressure double gear pump has the advantage that the seal groove on the intermediate body causes the pump structure to be reasonable, and the seal groove is especially suitable for the double gear pump working under high pressure area.

Bearing arrangement for a pump shaft of a pump for delivering media of different viscosities

Abstract: A gear pump has a housing, a pump shaft supported in a housing wall by a bearing, and a pumping gear supported on the pump shaft which is operable to pump newtonian and non-newtonian liquid of different densities. A relief collection zone is arranged on a low-pressure side of the bearing for collecting leakage liquid passing through the bearing along the shaft. At least two return ducts or bores are provided which connect the collection or relief zone with a suction side of the pump in order to return the collected leakage liquid.

Metering gearhead dispensing apparatus having selectively positionable gear pumps

Abstract: A fluid dispensing apparatus utilizing a through shaft metering gear pump. The metering gearhead includes an elongated drive shaft which receives multiple, self-contained gear pumps in a sliding manner. The gear pumps of the apparatus are connected to a fluid distribution manifold at a selected spacing with an inlet of each gear pump being connected to a central supply passage within the manifold and at least one outlet of each pump connected to a manifold outlet passage which may lead to suitable dispensing nozzles or guns. Each gear pump includes at least first and second gears with the drive gear being connected to the elongated drive shaft by way of a hollow shaft which provides both a sealing function and drive transfer function. The hollow shaft is keyed to the drive shaft to allow the pump body to be slid into the desired position.

Reduction gear with coaxial input and output shafts and combining planetary and nonplanetary gearing

Abstract: A reduction gear can provide a relatively large reduction gear ratio by changing the number of gear teeth but without increasing the number of gears, thereby simplifying the structure thereof. The power transmission flow in the reduction gear occurs as follows. In one embodiment, power simultaneously flows to both a first sun gear and to a second sun gear. From the first sun gear, power flows through, in succession, a planetary gear, a ring gear, a carrier and finally to an output ring gear and output shaft. From the second sun gear, power successively flows through a first differential gear and a second differential gear to the output ring gear and the output shaft. In another embodiment, power flows, in succession, through an input sun gear, a first differential gear and a second differential gear, to simultaneously both a differential sun gear and to a differential ring gear. From the differential sun gear and the differential ring gear power is transferred to a planetary sun gear and a planetary ring gear, respectively, which both, in turn, feed power to a planetary gear. The planetary gear feeds power to carriers which, in turn, transfer power to an output shaft.

Gear component for drive units for power transfer and braking

Abstract: The gear component comprises an input and output shaft, with first hydraulic, and second mechanical, gear part connected in series. The hydraulic gear part comprises at least two blade wheels - a primary and secondary blade wheel forming a toroid operating compartment. The two blade wheels are connected to the gear input shaft and the mechanical gear part at least by part of the first, power transfer phase by which power is transferred from the primary blade wheel via the secondary blade wheel to the mechanical gear part. One of the two blade wheels is held fast and supported in relation to the fixed gear parts. The other, second, blade wheel is joined to the second mechanical gear part.

Effect of Taylor diffusion on the dynamic response of an on-line capillary viscometer

Abstract: On-line rheometers are widely used as sensors in the process industries, and the most common type is a capillary viscometer fed by means of a side stream and a gear pump. A limitation on the application of this type of instrument for process control is the signal delay associated with the time required for fluid to flow from the main flow line to the capillary and the flow in the capillary itself. An important aspect of the contribution of this flow time to the rheometer dynamics is Taylor diffusion, i.e. the axial spreading out of the flow front due to the nonuniform velocity profile. We show the effect of Taylor diffusion on the dynamic response of the shear stress at the wall of a tube for a power-law fluid.

Control system for a hydraulic pump with pulsating flow

Abstract: A gear pump 1 delivers flow to a linear actuator 3 and coupled between the pump inlet and the output is a pulsed control valve 6 that is solenoid actuated. Between the outlet and the actuator is a non-return valve 7. The pulsation frequency of the pump is sensed by an inductive sensor 8 which provides an input to a control unit 9 that is based upon a triangular pulse-oscillator 13 having a symmetrical triangular pulse output signal, the latter being compared with a control signal supplied to the pulse-duration modulator (14) from a pulse-duration computer (15), with the pulse-oscillator (13) arranged in a phase control circuit 11. This operates to energise the return valve solenoid in synchronism with the peak amplitude of pump pressure cycle.

Reinforced bar cold extrusion connecting machine

Abstract: The utility model provides a reinforced bar cold extrusion connecting machine, relating to construction machine using superhigh pressure cold extrusion for connecting reinforced bars. The utility model comprises a hydraulic pump station vehicle, an extrusion connecting clamp, an extrusion connecting module and superhigh pressure wire rubber pipes, wherein, the hydraulic pump station vehicle is composed of an oil pump, a control valve, an oil tank, a motor and a meter, and the control valve comprises a liquor control low pressure spillover valve, a high pressure safety valve, a check valve and a manual valve. The utility model is characterized in that the oil pump of the hydraulic pump station vehicle is an oil pump that high and low pressure are connected in parallel and a high pressure plunger pump and a low pressure gear pump are connected in parallel, the spillover valve is arranged in a cavity lubricating groove of a piston-rod of the extrusion connecting clamp, and the seal of the inner part of an oil cylinder of the extrusion connecting clamp uses a combined sealed structure.

Steering device for running work machine

Abstract: PROBLEM TO BE SOLVED: To simplify the structure of the steering device which can adjust the speeds and rotational directions of the right and left crawlers of the running work machine arbitarily in a stepless manner. SOLUTION: A transmission mechanism transmitting power to the output shafts 21a and 21b of a right and a left running crawler, is formed out of paired right and left epicyclic gear shifting mechanisms 31 and 31 each of which is formed out of a sun gear 40, an epicyclic gear 39, and of a ring gear 42, the power of a running hydraulic transmission means formed out of a hydraulic pump 33, and of a hydraulic motor 34 is transmitted to the sun gear 40, and power from a turning hydraulic type driving means formed out of a second hydraulic pump 36, and of a second hydraulic motor 37, is so designed that it can be transmitted to a pair of ring gears 42 and 42 meshed with the respective epicyclic gears in such a way that their rotating directions are mutually opposite. When the tow pairs of hydraulic pumps 33 and 36 and hydraulic motors 34 and 37 are to be mounted onto a mission case 30, the first hydraulic pump 33 and the second hydraulic pump 36 are disposed along one straight line so as to let the power of an engine be inputted to them through a common shaft 70. COPYRIGHT: (C)1997,JPO

Microfabricated, tube located gear pump system

Abstract: A gear-type pump is placed in line with the conduit or tube (14) through which flows the fluid to be pumped. The pump body (12) is preferably manufactured using microfabrication techniques and is secured within the tube. The mechanism (24) for driving the pump body to pump fluid is mounted completely outside of the tube.

Combination triple gear pump

Abstract: The utility model relates to a combination triple gear pump, comprising a driving gear shaft 1, a front pump cover 2, a front pump body 3, a front-middle body 4, a middle pump body 8, a rear pump body 12, a rear pump cover 14, the driven gear shaft 26 of the front pump, the driven gear shaft 25 of the middle pump, the driving gear shaft 6 of the middle pump, the driving gear shaft 13 of the rear pump and the driven gear shaft 17 of the rear pump, and the driven gear shaft 26 of the front pump is installed in the rear pump cover 12. The combination triple gear pump is characterized in that rear-middle bodies 9-11 connected with the middle pump body 8 are provided with a transition connecting shaft 10 whose front end is cooperated with the internal spline 7 of the driving shaft of a middle pump by an external spline 45. The external spline 16 of the rear shaft of the transition connecting shaft is cooperated with the hole 15 of the internal spline of the driving gear shaft 13 of the rear pump. The combination triple gear pump is suitable for the hydraulic system of a crane with large tonnage.

On line rheometry: shear and extensional flows

Abstract: A novel on line rheometer has been developed to obtain melt flow characterisations on instrumented extrusion lines. On line capillary shear flow and entry pressure results are presented for a linear low density polyethylene and a polypropylene in twin screw extrusion at 200°C. Comparisons are made with results from a laboratory capillary rheometer at a shear rate range applicable to the extrusion process. Results show very good correlation in shear flow and good agreement for entry pressures; subsequent laboratory rheometer tests have shown the gear pump to have a negligible effect on the rheology of the tested melt. Bagley plots of pressure decrease v. capillary length/diameter ratio have been obtained from long dies ranging to those approaching orifice, for which non-linearity was obtained. Measurement noise was also studied: pressure fluctuations within the gear pump generated flow were examined at various frequencies to determine the cause and magnitude of any cyclic variations. Results suggest cyclic variations can be attributed to gear pump rotation and individual teeth meshing, but are negligible in comparison with overall noise.

Oil pump used in transmission

Abstract: PROBLEM TO BE SOLVED: To reduce the number of part items so as to carry out miniaturizing and right a weight, and avoid leakage of oil so as to carry out lubrication forcibly by spline-joining a pump rotor with a drive gear, and using a pump housing for the boss. SOLUTION: An oil pump 10 is built into a pump housing 11 utilizing the counter driving gear 34 side of a boss 35 for rotatably supporting a counter shaft 33, it is fastened to a pump rotor 12 which is spline-moined with a counter driving gear 34 and the pump housing 11 by a bolt 24, and it is assembled by a pump cover 15 confined in the pump housing 11. An outer spline 38 is cut in a boss 37 projected to a recess part 36 by the counter driving gear 34, the inner spline 21 in engaged with the spline 38, and an inner rotor 14 is spline- joined with the counter drive gear 34. It is thus, possible to reduce the number of parts so as to carry out miniaturizing, and right a weight. It is also possible to avoid leakage of oil so as to carry out lubrication forcibly. COPYRIGHT: (C)1997,JPO

Filling member-less internal-gear pump having a sealed running ring

Abstract: A filling member-less internal-gear pump in which the annular gear (4) is received in a running ring (3) forming an annular gap (31), and rotates therewith. The annular gap (31) is subdivided into peripheral portions which can be sealed off relative to each other and which are delimited from each other by sealing elements (44). The sealing elements are received in receiving spaces (45) in which they are displaceable in the peripheral direction and can seal off the receiving spaces relative to each other (FIG. 5).

Tandem power steering system with heat sink

Abstract: A power steering system for on-the-road and off-the-road vehicles includes a positive displacement hydraulic power steering pump, a master power gear with a rotary valve and a slave power gear mounted in tandem with the master power gear. Heated return hydraulic fluid from the master power gear flows through a heat transfer passage in the slave power gear and is cooled.

Injection device for tire life extending agent

Abstract: PROBLEM TO BE SOLVED: To easily and quickly inject a suitable amount of tire-life extending agent by providing a feed machine for feeding out the tire-life extending agent in a tank, and an operating machine for injecting the tire-life extending agent into a tire. SOLUTION: A tire-life extending agent in a tank 2 is passed through a suction hose 8 to be introduced into a gear pump in a feed machine 3. The tire-life extending agent sent out from the pump is introduced into an operating machine 4 through a feed hose 7. Then, the tire-life extending agent passes through an injector connected to the tip of the operating machine 4 and is then injected from a tire valve into a tire. An injection device 1 uses a battery 6 as a driving power source, and is excellent in its portability, since there is no need for laying a power cable. A battery charger 5 and the battery 6 can be stored in a rack. Thus, a suitable amount of the tire-life extending agent can be easily and quickly injected.

Brennstoff-Dosierpumpe eines Fahrzeugheizgeräts oder eines Partikelfilter-Regenerationsbrenners

Abstract: The invention concerns a fuel-metering pump for a vehicle heater (22) or a particle filter regeneration burner (22) for the exhaust system of a diesel engine. The invention is characterized in that the metering pump (2) takes the form of a gear pump (10, 12) integrated in a stepping motor (4, 6).