Showing papers on "Gear pump published in 1989"

Power washing apparatus

Abstract: A portable, high-pressure, power washing system is described which includes an electric motor driven gear pump where the electric motor is effectively water cooled by virtue of being contained in a thermally conductive housing surrounded by an insulating water jacket through which the water being pumped is made to flow before reaching the pump's inlet port The pump is driven through a gear reduction mechanism such that a relatively inexpensive, single-phase, series AC (universal) motor normally operating at a high rpm can be employed By proper dimensioning of the pump chamber relative to the drive and idler gears and by providing a flow divider at the pump chamber's discharge orifice, high pumping efficiency is obtained Completing the assembly is a discharge wand for directing the high pressure water at the surface to be cleaned and for controlling the on/off state of the pump's drive motor

Simulation of an external gear pump and experimental verification

Abstract: A detailed simulation program is presented for investigating the performances of an external gear pump. The geometrical aspects and the differential equations representing the quasi-steady state mathematical model of the pump are accounted for and discussed. Initial conditions are determined accordingly to a new proposed method and numerical aspects bound to the solution of the stiff ODE system are addressed. Experimental data generated on a commercially available medium size external gear pump were used to validate the model predictions. Agreement between experimental and predicted values of pump performances was satisfactory. Being the model unable to simulate pressure ripples generated by the unsteady nature of the flow within volumes and along the lines, several experimental results of inlet pressure fluctuations are reported. Predicted and unpredicted fluid borne noise sources are hence accounted. Finally, the influence exerted on the operation of the pump by pressure forces and forces exchanged between meshing teeth is investigated and a predictive method foreseen (useful in condition monitoring) based on the observation of outlet pressure waveforms.

Method and apparatus for applying single or multicomponent materials

Abstract: A method and apparatus for metering and pumping multicomponents of high and low viscosity materials and subsequently mixing and applying such mixture includes gear pumps (62, 64) for pumping each component. Each gear pump has gears (156, 162) operating in a gear housing (66) for receiving and pumping one of the components. The gear pumps are simultaneously driven at a predetermined speed and each gear pump is designed to pump a predetermined amount of its respective components, at the predetermined speed. Flexible hoses (42, 44) connect the pumps (62, 64) to an applicator (44). Check valves (96, 98) are used to maintain the pressure in these hoses when the pumps are in their at-rest position. The gear pumps (62, 64) may be driven at the same rotational speed but are designed to pump a predetermined amount of the different materials so that the ratio of materials can be precisely set. Where a single fluid is pumped, a gear pump (62′, 62″) is driven by a hydraulically driven torque motor (64′) or an electric motor (70″). The pump has a discharge connected by a hose (40′, 40″) to a dispenser (44′, 44″). A check valve (96′, 96″) is used to maintain the pressure in the hose when the pump is in its at-rest position. The gear pump need only be operated as necessary to maintain pressure in the hose. Precise metering of the fluid pumped is accomplished by controlling the operation of the gear pump.

Apparatus for delivering molten polymer to an extrusion

Abstract: A polymer metl delivery system includes a preheated hopper, a high clearance auger, a gear pump, and provisions for delivering heat to the polymer. The resin is melted and fed to the auger and pumped to the gear pump and further pump to an extrusion die. Heat is added to the polymers from the hopper and throughout its course to the outlet connection for the extrusion die. The preheated in the hopper includes heat conductive fins. The system is particularly suited for use in combination with a meltblowing die.

Method of scavenging air and oil and gear pump therefor

Abstract: A method of scavenging air and oil from a component (3) of an aircraft for returning the oil to a reservoir (4) for recirculation to the component involves the use of a gear pump (1) for scavenging the oil and gas. The gear pump centrifugally separates oil from the air and returns only the separated oil to the reservoir through outlets located upstream of the mesh zone of the gears while the air is discarded whereby lower discharge pressure of the gear pump is attained and there is no longer a need for a separate air-oil separator.

System and method for controlling continuous mixer with melt pump

Abstract: An improved system and method for effectively controlling the operation of a continuous mixer/melter having an adjustable exit opening and connected to a melt pump is provided. The melt pump, which is preferably a gear pump, is operatively connected to an extruder/pelletizer. Operation of the gear pump is controlled in proportional relation to the energy requirements of the mixer/melter motor, the energy applied to adjust and maintain the exit opening of the mixer/melter, and the suction pressure measured at the interface between the mixer/melter and the gear pump. A microprocessor unit which receives and processes the input signals, calculates the energy requirements of the gear pump motor and compares these requirements with the actual torque, makes the necessary adjustments to the gear pump.

Parts for use in rotary gear pump

Abstract: A drive gear (2) and a driven gear (3) for use in a rotary gear pump exhibiting good sliding characteristics against a pump case (4) made of light metals such as alumi­num alloys. One or both parts are formed from an aluminum alloy material obtained by subjecting an aluminum alloy powder which has been rapidly solidified at a cooling rate of 100°C/sec or more, or aluminum alloy powder having a particle size of 350µm or less, to powder compaction fol­lowed by hot extrusion and optionally hot forging, or alternatively to powder forging.

Infinitely variable hydrostatic mechanical power shift gear with group shiftings

Abstract: The gear consists of a four-shaft epicyclic gear, of which one shaft forms the input shaft which is in connection via an infinitely variable hydrostatic gear with the second shaft and of which the two remaining shafts represent connecting shafts which, in an extreme position of the hydrostatic gear, have the same speeds and behave during adjustment of the hydrostatic gear into the other extreme position in such a way that one becomes constantly slower and the other constantly faster, and which alternately act on the output shaft via gears of a gear group with following group shiftings. What is special is that the group shiftings make possible a multiple utilization of the gears of the gear group and that preparatory shifts for changing the group shifting provide the synchronization of idling gear parts, and that each gear change itself takes place at synchronous speeds, free from load and without tractive force interruption. Such gears require only small hydrostatic gears, have a particularly large transmission control range and favorable efficiencies. Its use in motor vehicles results in fuel savings and a superior acceleration behavior.

Drive mechanism for a sprinkler or the like

Abstract: In a drive mechanism for a transportable sprinkler or the like, a hydraulic motor has a reduction gear, whose gear or gear wheels are outside the water distribution system in a separate gear chamber and are therefore dry. However, the gear chamber is so integrated into the casing of the hydraulic motor, that it is adjacent to a reversing chamber used for water distribution purposes and in which is located a reversing valve of a reversing device for the alternating reversing of the hydraulic motor in both rotation directions. The hydraulic motor is drive-connected by means of a driven pinion to a support and in the drive connection is arranged a self-engaging safety clutch. Between the reversing chamber and a rotor chamber connected axially thereto and to the gear chamber is provided a pressure-dependently operating bypass water distribution system with simple flap valves. Thus, high operational reliability with extremely compact construction of the hydraulic motor is obtained.

Marine contra-rotating propeller drive system

Abstract: A marine contra-rotating propeller system comprises a large gear driven by an engine, and a plurality of small gears disposed so as to respectively mesh with the large gear at a plurality of fixed positions along the circumference of the large gear. Planet gears are respectively mounted to the gear shafts of the small gears. A sun gear and an inner-toothed gear are respectively meshed with the planet gears. A rear propeller is mounted to an inner shaft serving as a gear shaft of the sun gear. A front propeller is mounted to a tubular outer shaft serving as a gear shaft of the inner-toothed gear. The present invention can eliminate, with the simple construction, the inconvenience caused by a differential planetary gear operations in the prior art, can derive a propeller efficiency to the maximum extent.

Hydrostatic transmission system and power limiter control therefor

Abstract: An improved closed-loop hydrostatic transmission system is provided of the type including a pump (11), a motor (13), and a pair of conduits (15 and 17). The system includes a main control valve (43) and a charge pump (23) which is the sole source of make-up fluid to the closed-loop system and the sole source of control fluid for varying the pump. The system includes a power limiting means comprising first and second pressure relief valve means (75 and 77) operable to provide fluid communication from whichever side of the closed-loop is at high pressure to the system reservoir whenever system pressure exceeds the predetermined maximum pressure. The motor is adapted to transmit drive torque to a reversible load (37) of the type having a known inertia and a predeterminable time of deceleration from maximum speed operation in one direction to a standstill condition. A flow restriction means (44) in series relationship between the charge pump and a fluid pressure responsive means (31,33) of the pump is selected such that reversal of the main control valve ( 43) from maximum displacement in one direction to maximum displacement in the opposite direction results in destroking of the pump in a time period approximately equal to the time of deceleration of the reversible load, thereby substantially preventing cavitation and high-pressure spikes.

Displacement of variable displacement pump controlled by load sensing device having two settings for low and high speed operation of an actuator

Abstract: A hydraulic drive system has a variable displacement type pump, at least one hydraulic actuator driven by hydraulic fluid and a directional control valve for controlling a flow of the hydraulic fluid supplied to the actuator. The flow rate of the hydraulic fluid discharged from the hydraulic pump is controlled by a drive device that drives a displacement volume varying device of the hydraulic pump. A load-sensing control device controls the operation of the drive device and is responsive to a differential pressure between a discharge pressure of the hydraulic pump and a load pressure of the actuator to thereby hold the differential pressure at a setting value. The drive system further has an instruction device that instructs a change in the differential pressure between the discharge pressure of the hydraulic pump and the load pressure of the actuator. The instruction is received by a differential pressure setter capable of changing the setting value of the differential pressure.

Mechanical gear drive

Abstract: Backlash or play is avoided in a mechanical, self-adjusting gear drive having two sets of gears arranged in parallel to each other by one or more torsion springs effective between a driving shaft and a driven shaft. The gear sets form a closed gear train which contains the prestressed torsion spring (12) at any suitable point. After adjustment of the prestressing, the spring or springs eliminate any backlash throughout the whole gear train.

Combined supercharger and supercharger coolant pump for an internal combustion engine

Abstract: A combined compressor and pump has two parallel shafts journalled in a housing having a compressible fluid inlet and a compressible fluid outlet. Rotors are mounted on each of the shafts for forming a roots type compressor and compressing fluid from the compressible fluid inlet. One shaft of the compressor, which forms a supercharger for an engine, is driven by the engine, and the other shaft is driven in synchronization therewith by a pair of meshing gears mounted on the shafts, the meshing gears being constructed so as to form a gear pump. A coolant circulates within a coolant jacket in the housing and is circulated by the gear pump. The heated coolant may be circulated through a closed loop including a heat exchanger and a bypass passage for bypassing the heat exchanger during low temperature operating conditions.

Anti-leak seal for pump motor

Abstract: Method and apparatus for recovering leaked fluid or directing fluid flow or propagation through utilization of negative pressure pulses occurring in a pressurized fluid system. The invention has particular application in double acting hydraulic fluid motors where leakage of hydraulic fluid past the output shaft seal may be efficiently collected and redirected into the pressurized hydraulic fluid system through utilization of negative pressure pulses that are developed periodically by fluid direction changes during operation of the hydraulic fluid motor.

Gear pump with delivery rate control

Abstract: In a gear pump, for the purpose of delivery rate control, one of the two meshing pump gear wheels (2, 3) is mounted, by means of a piston, so as to be displaceable in the direction of the distance between the shafts (4, 5) of the two gear wheels (2, 3), in order to vary the meshing engagement (Figure 1).

Electrically-operated gear rotor pump

Abstract: The present disclosure is related to an improved electrically-operated gear rotor pump mainly adapted for automobile fuel injection system; a dc motor in driving connection with the pump is housed together with the pump in a unitary housing. The driving shaft of the dc motor is in coupling engagement with the gear rotor pump by means of a floating coupling device having H-shaped longitudinal cross section. The terminal end of the dc motor shaft is defined in a rectangular form so that it can be properly fitted in the correspondingly shaped groove at one end of the coupling device. The other end of the coupling device is provided with a pair of symmetric semi-circular arms which are in registry with the identically shaped grooves axially extended through the wall of the inner rotor of the gear rotor pump with a fixed shaft, which is secured to the inlet end portion of the pump by interference fit with the inner rotor rotatably mounted thereon, located therebetween. Thereby, no precise axial alignment between the driving shaft of the dc motor and the fixed shaft of the gear rotor pump is necessary, and the precision machining of the related elements can be less critically required with the production cost thereof effectively reduced. In addition, the operation noise of the pump can be greatly improved, and the pump life be enhanced at the same time.

Pump drive for fixed displacement pumps with mobile drive

Abstract: Pump drive for one or more fixed displacement pumps for supplying hydraulic circuits with varying required quantities at different drive speeds, preferably for CVT drive concepts. It is used, on the one hand, to save pump drive power in the upper operating speed range (in the case of conventional excess pressure-medium delivery) and, on the other hand, to ensure sufficient pressure-medium supply in the lower operating speed range and otherwise critical operating conditions, such as start-up of motor and vehicle. According to the invention, the pump drive path is guided via a superposition gear, at the second outlet path of which there is arranged a further driven machine (electric machine or hydraulic pump), via the power regulation of which the pump speed can be varied and optimised according to requirements. The power produced in this power path can be usefully fed to the vehicle supply system by means of an electric generator or can be used to supply further minor hydraulic circuits by means of a hydraulic pump; it can also be returned to the drive path via motor-driven further electrical hydraulic machines. By integration of electric machines, forward running of the pump drive and thus also towing or tow-starting of motor vehicles with automatic transmissions is made possible.

Reversible anti-backlash power transmission

Abstract: A reversible anti-backlash power transmission for selectively transmitting power in opposite directions without backlash in the gear train. The transmission includes interconnected first and second gear boxes. Each gear box includes a drive shaft having a worm associated with the drive shaft for rotation therewith, a worm gear in meshing engagement with the worm, a driven shaft associated with the worm gear for rotation therewith, and a pinion gear structurally associated with the drive shaft for rotation therewith. A rack gear is in meshing engagement with the pinion gear of each of the first and second gear boxes. An electro-magentic coupler interconnects the drive shafts of the gear boxes. The coupler allows the automatic angular displacement of the drive shafts of the two gear boxes relative to each other to eliminate gear backlash in any of the mating gears.

Two-stage gear pump with improved spur gear mounting

Abstract: A two-stage gear pump with two gear sets each having a spur gear telescoped onto a slotted drive shaft with a press fit and also positively keyed to the shaft. An annular groove is formed around the shaft adjacent the closed end of the slot in the shaft and enables the slot to be relatively short in axial length so as to reduce manufacturing problems and to enhance the press fit between the shaft and the first stage spur gear.

Apparatus and process for mixing and dispensing high viscosity, multiple component reactive liquids into a mold

Abstract: An apparatus and process are provided for mixing and dispensing high viscosity, multiple component reactive liquids into a mold. The apparatus and process are particularly suitable for mixing and dispensing highly viscous intumescent fireproofing materials. Each reactive liquid component is stored in a separate pressure tank. The liquid components flow through separate conduits leading from each pressure tank, and are metered by a gear pump located in each component conduit. A gear linkage synchronously links the gear pumps together, and a self-locking motor is adapted to drive the linked gear pumps. When the motor is turned off, the gear pumps act as a valve to stop flow of the component liquids. The metered components flow into a common conduit, which has therein a static mixer for thoroughly mixing the components. The mixed components are then dispensed through an orifice. This orifice can be directed to the bottom of the mold so that the mold can be filled with the highly viscous material from the bottom to reduce the formation of air voids.

Constant mesh gear box landing gear

Abstract: A gear box trailer support having axially fixed gears in the gear box, including axially fixed larger and smaller input means on an input shaft, and axially fixed smaller and larger output gear elements of a gear cluster on the output cross shaft to the bevel gear drive for the elevating screw in the telescopic leg subassembly. The input gears are in constant engagement with their mating respective output gears. Shifting between high speed low torque output and low speed high torque output is achieved by axial movement of the input shaft within and relative to the hubs of the input gears. This input shaft has a male transverse drive pin which selectively engages cooperative transverse female sloped wall drive slots in the facing inner axial ends of the axially fixed input gears.

Trimming/tilting system for marine propulsion unit

Abstract: A hydraulic tilt and trim system for a marine outboard drive unit for effecting quick tilting-up of the drive unit and slow trimming of the drive unit through a plurality of trim positions. The system includes two fluid motors, preferably of the piston-cylinder type, interposed between the marine vessel and the drive unit for adjusting the tilt and trim of the drive unit. A reversible fluid pump is used to power the fluid motors and communicates with the fluid motors by way of conduits and hoses. The system further includes a selector valve, which is manually or magnetically operated, to control the flow of hydraulic fluid from the pump to the fluid motors. To achieve slow trimming movement of the drive unit, the valve is adjusted so that the pump delivers hydraulic fluid to one fluid chamber of each fluid motor simultaneously while the fluid in the other chamber of each fluid motor is discharged back to the pump. In the quick tilt-up mode, the valve is adjusted so that the pump delivers twice the hydraulic fluid to only one of the fluid motors.

Lubrication of gear pump trunnions

Abstract: A thrust plate (64) for a gear pump or motor (10) which permits the use of high pressure fluid from the outlet side (30) thereof to lubricate the bushings and trunnions (36, 38, 40, 42, 48, 50, 52, 54) therein. The thrust plates (64) (see Figs. 5 and 6) include two small bores (82, 84) which pass therethrough and which are in fluidic communication with the inlet side (28) of the pump via the surface (66) of the thrust plate that confronts the gears (14, 16) within the pump. The foregoing bores (82, 84) are also in fluidic communication with the bushings (36, 38, 40, 42) by means of associated slots (86, 88) in the opposite side of the thrust plate. The opposite ends of the bushings (36, 38, 40, 42) are in fluidic communication with fluid at atmospheric pressure. By minimizing the size of the foregoing bores (82, 84) and by allowing the passage of fluid through same to the inlet side of the pump via the gear tooth confronting surface (66) of the thrust plate, pressure gradients are created across the trunnions (48, 50, 52, 54) and their associated bushings (36, 38, 40, 42). These pressure gradients permit high pressure fluid to traverse outwardly from the thrust plate (64) along the surface of the trunnions (48, 50, 52, 54) to the approximate end thereof to lubricate same and then to move inwardly along the trunnions (48, 50, 52, 54) toward the thrust plate (64) and to pass therethrough via the bores (82, 84) therein.

Device for pumping a fluid at the bottom of a well

Abstract: The device comprises a tubing (4) whose lower end is connected to a seat (5) on which bears a gear pump (6). The pump (6) comprises a pump case whose lower portion (10a) is engaged in a bore (5b) of the pump seat (5) and is connected to a cylindrical heavy body (20) which facilitates placing the pump (6) in position and maintaining the pump (6) on the seat (5). The weight of the heavy body (20) is determined as a function of the gear pump characteristics. The invention may be applicable to the pumping of petroleum fluids.

Dual output planetary gear system

Abstract: A gear system for driving a pair of rotary loads, such as a pair of helicopter rotors operating in ambient air, with a single rotary input comprises a planetary gear train, the sun gear of which is driven by the rotary input, and the planetary gear carrier and annulus gear of which respectively drive the loads via output shafts coupled thereto by suitable first and second coupling means, respectively. Where rotary outputs of substantially equal torque are desired, as where the rotors are of like dimension, one of the output couplings further comprises speed-reduction gearing and/or means for driving an auxiliary unit with the second output. An idler gear is further employed where the rotors are to rotate in opposite directions.

Apparatus for the extrusion of a thermoplastic melt

Abstract: The apparatus comprises the series connection of a metering device (1), an extruder (2) and a gear pump (4). By this apparatus, the melt is discharged under high pressure. In order to coordinate the individual elements of this apparatus with one another, the gear pump (4) is driven at constant speed. The melt pressure between extruder (2) and gear pump is controlled to keep at a constant value by the speed of the extruder being controlled as a function of the melt pressure. The torque of the extruder screw is controlled by the metering rate of the metering device (1) being changed as a function of the torque of the extruder screw.

Outside mounted permanent magnetic machine double seal device for gear pump

Abstract: The utility model relates to an outside mounted permanent magnetic machine double seal device for a gear pump, mainly composed of a still ring 1, a moving ring 2, a spring 3, a seal cavity 4 of normal pressure, a skeleton oil seal 5, a magnetic ring 6, a magnetic liquid 7, and a residual plate 8. The inner side face of the moving ring 2 is provided with 2-3 circular ring-shaped grooves, and the inner of grooves is provided with lubricating liquid, which can generate multiple sealing effects and reduce the friction area of moving and still rings. The magnetic ring 6, the magnetic liquid 7, and the residual plate 8 compose a magnetic sealing device. The utility model has the advantages of simple device, low cost, long service life, and no dripping phenomenon. The outside mounted permanent magnetic machine double seal device for the gear pump can solve sealing problem of various liquid pumped by the gear pump.