Showing papers on "Gear pump published in 1991"

Metered liquid dispensing system

Abstract: A liquid dispensing system utilizes a microprocessor based electronic control and a positive displacement gear pump to accurately meter predetermined batches of liquid pumped from a supply tank. The gear pump is driven by a reversible motor through a gear reducer, and is operative to pump a predetermined fixed volume of liquid for each revolution or fraction of revolution of the pump drive shaft. A passive magnetic sensor is positioned adjacent the toothed periphery of a target wheel, which is mounted on the motor shaft, and generates a signal representative of the amount of rotation of the pump drive shaft. The electronic control is responsive to this signal for calculating the total volume of liquid dispaced by the pump. The electronic control includes a keyboard which enables a user to preprogram the precise amount of liquid to be dispensed. The system includes a discharge hose for dispensing the liquid into a user's container, which hose is automatically primed by the system prior to the dispensing operation. The system can also be provided with a provision to "drain back" the liquid into the supply tank after the dispensing operation, and/or to recirculate liquid through the supply tank when it is desired to mix the contents thereof.

Gear pump with a resilient means for biasing a side wear plate

Abstract: A gear pump for use in a metered liquid dispensing system utilizes a pair of carbon graphite wear plates to increase pump vacuum or suction lift capabilities. The wear plates are disposed on opposite sides of the pump spur gears and are biased against the sides of the gears to reduce internal pump clearances. The biasing force is provided by a resilient O-ring positioned between a surface of the pump housing and one of the wear plates. The gears are mounted for limited movement so the urging of the one wear plate is transferred through the gears to the other wear plate. The gear pump is driven through a gear reducer unit by a reversible electric motor. The use of a gear pump assures accurate metering of the amount of fluid delivered by the system.

Hydraulic motor with inlet fluid supplemented by fluid from contracting chamber

Abstract: An arrangement intended for controlling hydraulic motors and comprising inlet elements (17, 18) and outlet elements (7, 5) in the form of valves arranged in a hydraulic circuit which connects the hydraulic motor (1) with a pump (15) which functions as a power source for at least the hydraulic motor (1) and preferably, but not necessarily, for one or more further hydraulic motors, and also to a tank (9). Each inlet element (17, 18) is mounted in the hydraulic circuit on the pressure side of the pump, whereas each outlet element (5, 7) is mounted in the hydraulic circuit on the suction side of the pump. The arrangement is characterized in that each inlet element (17, 18) detects the pressure prevailing in the hydraulic circuit at a location between the hydraulic motor (1) and the outlet element (7, 5), and is also controlled by this detected pressure on load lowering occasions in accordance with a separately applied control-pressure, such as to steer the flow of fluid from one piston side of the hydraulic motor to the other piston side thereof and relieve the pump (15) of load.

Helical gear pump and stator with constant rubber wall thickness

Abstract: A helical gear pump having a stator in which the wall thickness of the stator is substantially constant. This reduces heating in dry running conditions and this effect can be improved by providing anti-friction surfaces on both the rotor and stator.

Variable speed hydraulic pump system for liquid trailer

Abstract: The present invention relates to a hydraulic pump system comprising: (a) a variable displacement pump; (b) an engine used to drive the variable displacement pump; (c) a power takeoff unit for engaging or disengaging the engine from the variable displacement pump; (d) a hydraulic motor driven by the variable displacement pump via hydraulic fluid pressure; (e) a liquid pump driven by the hydraulic motor; (f) a hydraulic fluid cooler in communication with the hydraulic motor; (g) a hydraulic fluid reservoir in communication with the cooling means and the inlet the variable displacement pump; (h) hydraulic piping and/or hose for connecting the hydraulic motor, cooler, reservoir and variable displacement pump; and (i) filters located within the hydraulic piping and/or hose.

Dual capacity fluid pump

Abstract: A dual capacity pump having at least two gear pump stages with a common fluid inlet passage, each pump stage having a discharge port, the discharge port for one stage communicating with a fluid pressure load through a flow delivery passage and the discharge port for the other stage communicating with the flow delivery passage through a one-way flow valve, and flow control valve means responsive to an operating variable for connecting the discharge side of the other stage to the common fluid inlet passage during operation in a first operating range of low driving speeds for the pump and to said flow delivery passage through the one-way flow valve during operation in a calibrated range of values for the operating variable.

A compact precision extrusion system and method

Abstract: A compact and precision extrusion system and method for extruding strips of rubber compounds with profiles of accurate dimensions. Strips of rubber compound (7) are uniformly heated and mixed in an extruder and then passed through a low pressure drop strainer (19) to remove foreign matter. The strained compound then is fed directly into a gear pump (20) which delivers precise volumes of the rubber compound immediately into the spread chamber of an extrusion head (21) after which it passes through a die to form a precise strip (23) of the rubber compound. The strainer and extrusion head are movably mounted with respect to the gear pump for axial separation from the gear pump for easy removal of the rubber compound from the various components of the system to facilitate compound changes. A control system regulates the speed of the extruder to provide a near constant pressure at the entrance port of the gear pump to precisely regulate the rate of extrusion of the compound from the extrusion head. The extruder preferably includes a feed section (30), a pressure generation section (31), and a mix section (32) which maintain the temperature of the rubber compound below 100°C.

Getriebe mit einer verdraengerpumpe

Abstract: The lubricating arrangement and/or the control and actuating arrangements of shift gears, in particular automatic and infinitely variable shift gears, are supplied with pressure medium by a positive-displacement pump. The positive-displacement pump is driven at the speed of rotation of a driving motor and is designed as a suction-throttled (16) pump. Advantageously, the pump used is a radial piston pump (21).

Internal combustion engine oil pump with cover

Abstract: An I.C. engine lubrication system comprises a gerotor pump set driven by a gear meshed with another gear on the crankshaft (FIG. 1). This enables pump diameter to be selected for minimum power absorption as compared with prior art arrangements where the gerotor surrounds the crankshaft, and also simplifies pipework particularly on the delivery side of the pump.

Internal gear pump without sickle element - incorporates method of dimensioning teeth to give compact design

Abstract: The internal gear pump operates without a sickle element. It has a hollow wheel (6) and a pinion (5) in neighbouring housing parts in which the width of the teeth (12) of the pinion is at least as large as the pitch circle dia. (do) of the pinion. The total cross section surface of all the openings (17) through the hollow wheel amounts to at least 20 percent of the outer lateral area, determined by the width and the OD of the hollow wheel. USE/ADVANTAGE - Internal gear pump in which the outer dimensions have been reduced.

External gear pump - has main drive gear fixed inside housing and driven gear adjusted by pressure differential piston action

Abstract: The external gear pump with a continuously variable delivery flow has two gears which are adjustable relative to each other. The drive gear (3) has a fixed location inside the housing (1) and the driven gear (4) may be adjusted according to the fluid pressure differential to give the required flow characteristic. The gear position is adjusted b a pressure piston attached to the gear journal. ADVANTAGE - Automatic flow control.

Plural hydraulic pump system with unloading valve

Abstract: A pump system is disclosed which operates at high efficency in either a high volume, low pressure mode or a low volume, high pressure mode. First and second internal gear pumps are driven by a common drive shaft. The first pump has a smaller displacment than the second pump and both pumps deliver pressurized fluid to a common discharge passage. An unloading valve is operative to dump the output of the second pump in response to fluid pressure in the discharge passage so that it delivers fluid to the load device only when the pressure is below a predetermined value. The unloading valve also performs the function of a low capacity accumulator. A check valve is provided to prevent back flow in the outlet of the second pump.

Extrusion method and apparatus for producing a body from powder material

Abstract: An improvement in a method and apparatus is provided in extruding a powder material to form an article, in which the material is passed through an extruder and then through a die, wherein the material is provided in the form of a mixture which includes a vehicle, the improvement comprising having one or more gear pumps in succession between the extruder and the die, so that the powder material passes through the gear pump(s) after it leaves the extruder and before it enters the die. The gear pump(s) can have one or more pair of gears which are arranged sequentially with respect to the flow of the material.

Gear pump having internal bypass valve

Abstract: A continuously driven gear pump includes an internal bypass valve for selectively controlling the supply of pressurized fluid to a hydraulically actuated device. The internal bypass valve includes a movable spool which is spring-biased to a first position, wherein the flow of fluid is bypassed from the outlet port back to the inlet port, and no fluid is delivered to the actuated device. The spool has an internal passageway formed therethrough which permits a relatively small amount of fluid to pass from the outlet port back to the reservoir when the gear pump is operated in the bypass mode. To replenish this small amount of fluid which is returned to the reservoir from the outlet port, the gear pump draws a corresponding small amount of fluid to the inlet port. Thus, a small amount of fluid circulates between the gear pump and the reservoir when the gear pump is operated in the bypass mode. This circulation cools the pump without causing a significant load to be placed on the engine. The spool can be moved to a second position against the urging of the spring, wherein the entire flow of fluid is directed to the actuated device.

Gear pump with pressure balancing structure

Abstract: A gear pump which includes a pressure balancing structure to ensure balanced pressure within the pump chamber during low flow operation is disclosed. A groove is formed in the casing internal surface throughout the entire axial length of the gears and supplies high pressure fluid to positions within the pump chamber which are at a high pressure during normal flow operation. This groove thus ensures that high pressure fluid will be at all locations within the pump chamber which are expected to have high pressure during normal pumping operation. Forces on the gear are as expected during low flow operation, and that the gears will not be forced in an undesirable direction.

Fully variable output hydraulic gear pump having an axially translatable gear

Abstract: A fully variable output hydraulic pump includes a main casing having a fluid pumping chamber extending therethrough, fluid input ports and fluid output ports. The fluid pumping chamber is shaped to receive a pair of cylindrically shaped gears inserted axially therethrough. A first rotatable gear and second rotatable gear are insertable through the pumping chamber. The first and second gears are rotatably supported by respective means which are axially translatable relative to each other. A means for sealing the area between the gears and the main casing effectively creates a sealed fluid pumping chamber. By translating one of said means for rotatably supporting the gears, the effective fluid pumping volume within the fluid pumping chamber may be altered to provide a fully variable output hydraulic pump.

Gear pump having multiple pairs of gears

Abstract: An improvement is provided in a gear pump comprising a pair of intermeshing gears enclosed in a housing, the improvement comprising having at least one additional pair of intermeshing gears, wherein the gear pairs are non-meshing with one another.

Speed matching gearing for auxiliary machine and motor vehicle IC engine - has two connectable gears with fast gear at low engine RPM increasing generator speed and other gear with 1 to 1 ratio conversion connected at upper engine RPM

Abstract: The system includes a belt pulley, a planet gear with an annular gear, a planet gear carrier, planet gears and a sun gear, a housing and a sump filled with oil and a clutch allowing a free wheeling mode. The clutch (83), for attaining a compact axial designed construction, is annular around the system, essentially in one plane with this arranged vertical to the shaft (1) and connected non-rotational to the generator housing (81) via an intermediate housing (85). In operation, with gears set in 1:1 ratio, all components of the drive rotate without slip at the working r.p.m. No relative rotation results at the seals (29, 31, 14) bearings (47, 11, 15), the by-pass opening (13) for free-wheeling or the oil feed tube (19). ADVANTAGE - Axially small gear unit with two speed positions. Low noise level. Gearbox sealed to outside. Assembly is easy and after service is simplified.

Hydrostatic split-type vehicle power transmission

Abstract: The power transmission has a four-shaft double planetary gear, which is driven on the one hand via a turning gear and on the ohter via a variable-displacement gear and is connectable on the power take-off side via selectable ratio gears via controllable clutches to a power take-off shaft. It is connectable on the power take-off side retroactively via two of the selectable ratio gears by a startup clutch as a result of which with the turning gear disengaged, a fully hydraulic startup range is provided. The other gear ranges are mechanically-hydraulically split in terms of power when the turning gear is engaged.

Variable delivery gear pump

Abstract: A geared pump (10) with a variable flow rate, in which the gears (14, 16) can slide axially relative to each other, has a pair of cup-shaped sealing elements (36, 40) adapted substantially to fill the spaces between adjacent teeth and having slots (37) in which the tips of the teeth of the gears are disposed.

Fuel supply assembly for a motor vehicle

Abstract: A fuel supply assembly for feeding fuel to an internal combustion engine and comprising a gear pump that includes a ring gear having inner teeth, and a pinion arranged eccentrically with respect to said ring gear and having outer teeth meshing with the inner teeth of the ring gear and defining therewith expanding and contracting chambers during operation of the pump, the pump further including an outer support element for movably supporting the ring gear and including a supporting surface which engages a portion of the outer surface of the ring gear and is located radially outside of a discharge opening of the pump.

Internal gear pump for hydraulic fluids

Abstract: The external gear of the internal gear pump is stationary and forms a closed internal chamber. The smaller internal gear is arranged so that it is free to rotate on a driven eccentric cam (11) and meshes with the external gear. The eccentric cam (11) is freely rotatably mounted on a journal (10) concentric with the pump axis (13). Inlet is by way of a recess in the front side of the journal. This recess is connected by radial holes or grooves in the internal gear with the inlet side of the pump.

Planetary gear type differential apparatus

Abstract: A differential apparatus of planetary gear type comprises an internal gear, and a sun gear on the side of an axle. Each of a plurality of pinion-gear sets has an even number of pinion gears rotated in mesh with each other. Ones of the pinion gears on the outside are in mesh with the internal gear, while the remaining pinion gears on the inside are in mesh with the sun gear. A pinion carrier rotatably supports the pinion gears. A torque is inputted from one of the internal gear and the sun gear. A rotating frictional force between the pinion gears on the torque output side and the pinion carrier is reduced less than those of each of the remaining pinion gears.

Texturing treatment for high-water content protein stock and system therefor

Abstract: PURPOSE:To efficiently obtain a food material having meat-like texture from a high-water content protein stock by equipping the stock passage between an extruder and die with a pump followed by pressure regulation to alter the sectional area of the passage. CONSTITUTION:When a high-water content protein stock is to be kneaded and conveyed using a twin-screw extruder 2 and extruded through a die 27, the tip of the extruder 2 is equipped with a rotary gear pump 6 made up of a pair of gears 5, and the stock's conveyance fed from the extruder 2 is controlled through the gears' revolution. The tip of the gear pump 6 is fitted with a variable throttle valve 15 to alter the sectional area for a stock passage 19 through the back-and-forth motion of a valve shaft 17, and the stock outlet 19d for the throttle valve 15 is fitted with the die 27. The stock carried through the extruder 2 is subjected to resistance through the gear pump 6 and the throttle valve 15 and enhanced in pressure along with temperature rise and then extruded via the die 27. Thus, the stock is textured in a fibrous fashion along with evaporation of the water contained and puffed.

Small-sized precision extruding system and extruding method

Abstract: PURPOSE:To obtain a precision extruding system for manufacturing correct rubber extruded substance by preparing strainer means on the discharge end part, and also preparing gear pump means adjacent to the strainer means at the down stream side thereof CONSTITUTION:When a compound moves passing through an extruding device, it is heated and mixed uniformly The temperature of the heated compound in the extruding device is kept lower than 100 degC and compound pieces are allowed to pass through the strainer Foreign objects are removed from the compound, and pressure drop crossing the strainer is kept lower than 25 bars By permitting the compound to pass through a gear pump, precision volume compound is delivered in an extruding head, and when it passes through the extruding head, the compound received from the gear pump is re-molded and then compound pieces are extruded from the extruding head In this way, a cooling conveyor can be shortened and thereby costs of the apparatus can be decreased

Internal gear pump with radial openings

Abstract: A crescent-less internal gear pump. The internally geared wheel has a plurality of radial openings from its peripheral surface into the tooth gaps at the tooth base. The axial width of the pinion and/or the internally geared wheel is at least as great as the diameter of the rolling circle of the pinion. The filling of the inside of the pump through radial openings makes it possible to make the internally geared wheel as axially wide as the suction connection or as that part of the housing which receives the active gear parts participating in the formation of the delivery stream. It is possible to develop the axial width of the toothing considerably larger than the diameter of the rolling circle of the pinion. Complete filling of the tooth gaps with pressure fluid is assured without the occurrence of flow velocities at which the formation of noise or other disadvantages is to be expected. The pump can also be provided with two internally geared wheels arranged alongside each other.

Hydraulic pump or motor - has electro-viscous fluid seal that is controlled to generate rapid response

Abstract: The hydraulic pump or motor unit has a rotor (2) with a pair of impellors (9). When operated a pump motor (3) drives the impellor and fluid is drawn from a reservoir (11) and passes through to outputs (16) coupled to a load (17). The impellors have capacitor plates (6) on either side and these are connected to a control unit. A ring shaped space (4) is filled with an electroviscous fluid, which becomes highly viscous when a voltage is applied. This causes a sudden sealing action and the pumped fluid pressure rapidly increases. ADVANTAGE - Provides fast response action.

Pump controlled automatic transmission

Abstract: A hydromechanical transmission includes a first shaft having a drive source end and a transmission end which receives torque from a drive source, a planet gear mounting structure joined to the transmission end of the first shaft, at least one planet gear rotatably mounted on the planet gear mounting structure, a ring gear surrounding and meshing with the at least one planet gear and joined by a connecting structure to a second shaft to which the transmission delivers torque, an annular sun gear slidably surrounding the transmission end of the first shaft and meshing with the at least one planet gear, a first pump having a pump operating shaft, the pump operating shaft being joined to the sun gear through gears, fluid to pump through the first pump, a valve for controlling the flow of fluid out of the first pump. A second pump and second planet gear assembly provide reverse drive, and provision is also made for neutral and park modes.

Device for recovering energy in reverse osmosis systems - uses throttle valve in retentate line replace by pump coupled to feed pump with smaller delivery rate

Abstract: Device for recovering energy in reverse-osmosis installations comprises first pump (1a) in the raw water inlet pipe, which is mechanically connected to a second pump (1b), which is in the retentate pipeline (i.e. the return pipe for water which has not passed through the osmosis membrane), and has a delivery rate which is less than that of the first pump (1a). The delivery rate of the second pump is 60-90 percent of that of the first pump. The two pumps (1a,1b) may be in the same housing and may be multiple gear pumps whose driven wheels engage with driving wheels on a single drive shaft. USE/ADVANTAGE - Used in reverse osmosis systems in e.g. desalination of sea-water. The customary throttle valve used in the retentate line is replaced by the second pump, so energy normally dissipated in the throttle valve is in part recovered and the overall energy consumption of the installation is therefore reduced.