Showing papers on "Gear pump published in 1984"

Fluid operated pump displacement control system

Abstract: A control system for a variable displacement pump or pumps driven by a vehicular engine for supplying pressurized fluid to implement actuators via implement control valves. The engine has several output conditions each with a different output torque characteristic. The control system includes a servomechanism comprising a servoactuator section coupled to the pump for varying the per cycle displacement thereof, a servovalve section for operating the servoactuator section by fluid pressure from a fixed displacement pump, and a control section for actuating the servovalve section. The servomechanism control section is fluid operated from a torque control valve, which delivers a controlled degree of fluid pressure from the fixed displacement pump to the control section in order to correspondingly vary the torque requirement of the variable displacement pump. The torque control valve is solenoid operated from a controller in association with a sensor capable of sensing each output condition in which the engine operates, in such a way that the torque requirement of the pump is controlled to suit the sensed output condition of the engine. The servomechanism control section is further under the control of a drain sensor effective to control the pump displacement in accordance with the flow rate of the fluid being drained from the implement control valves.

Hydraulically driven bicycle

Abstract: A hydraulically driven bicycle frame with two axle members coupled to the bicycle frame and front and rear wheels mounted on such axles for rotation about the axis of the respective axle and a pair of pedals mounted on a pedal drive shaft coupled to the bicycle frame for rotation for applying manual power for operating the hydraulic system of the bicycle. The hydraulically driven bicycle has a hydraulic pump mechanism and a hydraulic drive mechanism. The hydraulic pump mechanism is operated by rotational movement of the pedal drive shaft. The hydraulic pump mechanism includes a pump housing having two sectional pump housing members that form a pump chamber between them. The two sectional pump housing members are capable of relative movement with respect to each other so that the pump chamber is capable of being varied in size for varying the flow of fluid through the pump mechanism. The hydraulic drive mechanism is driven by the fluid pump by the pump system and is coupled to one of the wheels of the bicycle for providing a rotational force to such wheel. The hydraulic drive mechanism includes a drive housing having two sectional drive housing members which form a drive chamber between them. The two sectional drive members are capable of relative movement with respect to each other so that the drive chamber is capable of being varied in size for varying the flow of fluid through the hydraulic drive mechanism. The hydraulic pump mechanism and the hydraulic drive mechanism are interconnected by fluid circulating tubes so that a closed hydraulic system is constructed on the bicycle.

Lubrication scavenge system

Abstract: A lubrication scavenge system for an engine bearing compartment or the like utilizing a gear pump with two or more independent inlets with separate flow paths through the pump. The inlets and flow paths are maintained separate from each other by the use of inlet and discharge seal arcs to avoid any fluid communication therebetween. The pump can operate to pump different fluids through each inlet with the fluid being either a gas or liquid or a mixture of both and with the pump continuing its pumping action when there is an instantaneous interchange in the fluid being pumped at each inlet as can occur when the engine bearing compartment is subjected to varying positive and negative gravity forces.

Hydraulic control unit for automotive transmissions

Abstract: O A hydraulic control unit for an automotive transmission has a change gear operating mechanism and a clutch operating mechanism. All incorporated in the control unit housing in one body are the component parts of the former mechanism of a first hydraulic actuatorfor gear shifting and gear selection of the speed change gear, solenoid valve means for controlling said first hydraulic actuator, position sensors for sensing positions of the first hydraulic actuator indicative of the selected gear position and shifted gear position of the speed change gear, as well as of the latter mechanism of a second hydraulic actuatorfor engagement and disengagement of the clutch, solenoid valve means for controlling the second hydraulic actuator, and a position sensor for sensing the position of the second hydraulic actuator indicative of engagement and disengagement of the clutch. An air breather provided on the control unit housing on the side of the speed change gear communicates with an air chamber of the second hydraulic actuator through a passage formed within the control unit housing, to also serve as an air breather for the same chamber.

Performance of gear pumps in polymer processing

Abstract: Within the past several years considerable interest has developed in the practice of retrofitting plasticating extruders with gear pumps. The primary motivation for this is to reduce surges and fluctuations in the extrusion rate, thereby improving product quality and reducing waste. It is shown that the effectiveness of a gear pump for this purpose is directly related to its volumetric efficiency, which depends upon the pump dimensions, the flow behavior of the polymer, and the operating variables of temperature, pressure differential, and pump speed. Experimental data on three thermoplastic materials using a pump having gear wheels of 36 mm diameter for both leakage and power are reported. These data have been correlated with semi-empirical equations.

Hydraulic system for recirculating liquid

Abstract: A hydraulic system, suitably an ink supply system for an ink jet printer, wherein a first pump conveys ink under pressure from a reservoir to a work head and a gear pump returns unused liquid from a collector at the work head to the reservoir. A bleed line connects an outlet from the first pump to an inlet to the gear pump. Accordingly, there is a flow of liquid via the bleed line such that the gear pump applies sufficient suction to the collector to draw air or a mixture of air and unused liquid therefrom. The flow is also sufficient to ensure adequate lubrication of the gear pump. The first pump may also be a gear pump, in which case the two pumps are formed as a double-ended pump.

End Plate Balance in Gear Pumps

Abstract: This paper presents a computer aided approach to the design of fixed and floating end plates in gear pumps. Account is taken of the relative tilt of the plates and gears and of the hydrodynamically and hydrostatically generated pressures between the gears and end plate. Criteria for achieving load and moment balance are outlined and the effects of cavitation discussed. It is shown that the approach leads to an understanding of the behaviour of wear plates and enables the effect of changes in plate design to be assessed.

Multiple-stage geared rotary actuator

Abstract: A multiple-stage geared rotary actuator having a plurality of balanced compound differentials providing a multiple-stage output and for converting a high-speed, low-torque input to a low-speed, high-torque output for moving a member, such as an aircraft flight control surface. The balanced compound planetary differentials each have a plurality of planet gear shafts with a center gear and outer gears at opposite sides of the center gear and with the tubular planet gear shafts of the planetary differentials being in axial alignment. The maximum deflection resulting from bending forces acting on the tubular planet gear shafts is minimized by changing the boundary conditions at the ends of the planet gear shafts. This change in the boundary conditions is achieved by the use of structure positioned within the planetary gear shafts and extending through the length of the rotary gear actuator and common to all of the axially aligned tubular gear shafts, with one embodiment of such support structure being a bolt which preloads the adjacent tubular planet gear shafts. The support of the tubular planet gear shafts enables the design of a geared rotary actuator using longer planet gear shafts for increased torque-transmitting capability while keeping planet gear shaft deflections within acceptable limits for optimum gear mesh.

Driving gear interaxle differential assembly for all-wheel-drive vehicles

Abstract: A four wheel drive gear box having a planetary internal differential concentric with a reduction gear driven by an output gear of a transmission, a planetary carrier driven by the reduction gear, a ring gear driving a first shaft concentric with the reduction gear, a sun gear driving a second shaft which carries a gear which drives, via other gearing, an inter-wheel differential, the first shaft driving the other inter-wheel differential, a support member enclosing the inter-axle differential and connected with the reduction gear, and a connecting member between the ring gear and the first shaft.

Servo pump for hydraulic systems

Abstract: A servo pump for use in a hydraulic system. The servo pump is constituted by a variable displacement type hydraulic pump adapted to be driven by a high-speed motor and to hydraulically drive an actuator. The motor and the pump are housed in a common casing. The motor shaft and the pump shaft are integrated to form a common rotary shaft which is supported rotatably at both its ends by end bearings and at its intermediate portion by an intermediate bearing.

Gear pump, especially for medical purposes

Abstract: A gear pump (1) comprises a pump housing (2) in which two stationary journals (12,13) are disposed. On the journals (12,13) a driving pump wheel (7) and a driven pump wheel (8) are mounted. The driving pump wheel (7) in the example is integrally joined to a shaft (16) which is constructed as hollow shaft and on which a hub (24) with a magnet (11) is disposed as part of a magnetic coupling of the gear pump (1). With this construction a wear of the journals (12,13) in their bearing region in the pump housing (2) under the action of aggressive cleaning agents such as acetic acid is prevented because the journals (12 and 13) do not rotate in their bearings. On the other hand, by provision of the shaft (16) constructed as hollow shaft the drive connection is established between the driving pump wheel (7) and the magnet (11) forming part of the magnetic coupling, and wear of the shaft (16 ) rotating on the journal (12) is prevented by constructing said shaft from a particularly anti-frictional plastic which is also used for the pump wheels (7 and 8).

Characteristics of Fluidborne Noise Generated by Fluid Power Pump : 3rd Report, Discharge Pressure Pulsation of External Gear Pump

Abstract: This paper presents characteristics of discharge pulsating pressure generated by an external gear pump. Based on the theoretical and experimental examinations, it is pointed out first that the former mathematical model for flow ripple is insufficient in the case of high working pressure or low pump speed. It is found experimentally that a large amount of leakage through relief grooves takes place intermittently in the vicinity of the central position of trapping. This leakage affects dominantly the fluctuation of a discharge flow (flow ripple), especially its higher harmonic components. The calculated values of discharge pressure pulsations based on the presentmathematical model for flow ripple taking the leakage mentioned above into consideration agree well up to about tenth harmonic with the experimental values.

Automatic resin dispensing apparatus

Abstract: An automatic resin dispensing device comprising a gear pump for pumping resin and a piston pump for pumping catalyst. Both pumps are coupled to a single air motor which drives both pumps via a dual output gear box. The piston shaft of the catalyst pump is connected to a radially located pin on a disk that is rotatably coupled to the gear reduction output of the gear box. The stroke of the piston pump, and hence the amount of catalyst relative to resin dispensed, is varied by adjusting the radial position of the connecting pin on the disk. The resin pumping system and catalyst pumping system are separated within the device to improve the safety of the device and enhance its reliability.

Hydrostatic self-regulating drive system

Abstract: A hydrostatic drive system has an internal combustion engine, a main pump driven by the engine and having a control element displaceable to vary the pump displacement, a control pump driven by the engine, an output motor having a control element displaceable to vary the motor displacement and having a rotary output, and conduits interconnecting the main pump and output motor for driving of the motor by the pump A speed-measuring pump is connected to the motor output and produces a pressure differential corresponding to the speed of the motor output A pump controller is powered by the control pump and connected to the pump control element for adjusting the pump displacement A motor controller is connected to the motor control element for adjusting the motor displacement An engine controller includes a first engine cylinder connected to the speed-measuring motor and operable thereby for adjusting the engine speed and a second engine cylinder connected to the control pump and operable thereby for affecting engine speed

Integrated power drive and power transfer system

Abstract: In many aircraft, there are flight control surfaces positioned by mechanical actuation systems that are driven by hydraulic power drive units. There are also devices for transmitting hydraulic power from one aircraft hydraulic system to another in the event that one of the system's pumps fails. An integration of structure to perform both of these functions in a single unit would result in a reduction in cost and weight as well as increased reliability. The integrated power drive and power transfer system has a pair of variable displacement hydraulic devices each in a separate hydraulic circuit and each having a drive shaft connected into a summing gear train connected to an output shaft. A selectively-operable brake is in the operative connection between the output shaft and the summing gear train and controls either driving of the output shaft with both variable displacement hydraulic devices operating as motors or transfer of power between the hydraulic circuits with one variable displacement hydraulic device operating as a motor and the other as a pump.

Hydraulic control type automatic speed change gear

Abstract: PURPOSE:To secure instantaneous short supply of working fluid and to accomplish stable control by disposing an accumulator for accumulating working fluid supplied to each portion of the hydraulic control device in the hydraulic control device of the above automatic speed change gear CONSTITUTION:A hydraulic control device in a hydraulic control type automatic speed change gear includes a hydraulic pump 411, pressure regulating valves 430, 450, a lock-up control valve 470, the first and second accumulator valves 480, 490, a manual valve 510, and hydraulic servo C-O, B-O for shift valves of each step, clutches and a brake In this case, an accumulator 600 is disposed in an oil path 1 on the upstream side of the manual valve 510 on the downstream side of the pressure regulating valve 430 When line pressure is supplied to the oil path 1, working fluid is accumulated in the accumulator 600, and the working fluid is used for compensating the instantaneous short supply of working fluid caused by a hydraulic pump 411 and the like

Synchronized mechanical-hydrostatic gearbox

Abstract: A synchronized mechanical-hydrostatic gearbox with infinitely variable drive ratio including a hydrostatic gear and a following mechanical gear coupled thereto. The hydrostatic gear includes a hydraulic transmission motor with variable displacement which is connected to the mechanical gear. The mechanical gear is made with at least two gear ratio stages and with means adapted for altering the displacement of the hydraulic transmission motor on alteration of the gear ratio of the mechanical gear to an extent corresponding to the gear ratio change. The gear box is intended to be incorporated in a transmission for vehicles, particularly terrain vehicles, preferably driven by an internal combustion engine.

Power transmission apparatus for vehicles

Abstract: In a power transmission apparatus for use in a vehicle of the type in which its front and rear wheels are driven by the same engine (1), a first rotary shaft (11) drivingly connected to the front wheels (9) and a second rotary shaft (14) drivingly connected to the rear wheels (16) are coupled to each other through a hydraulic oil pump (13) which is driven according to the rotation speed difference between the first and second rotary shafts (11, 14) and delivers hydraulic oil of an amount corresponding to the rotation speed difference. The pressure of hydraulic oil delivered from the pump is controlled by hydraulic control means (21) so as to automatically change over between the two-wheel drive mode in which the front or rear wheels only are driven and the four-wheel drive mode in which both the front and rear wheels are driven. A relief value (33) controls the relative speeds and driving forces of the front and rear wheels. A computer (39) controls the relief valve (33), and receives inputs responsive to engine speed, speeds of shafts (11, 14), engine throttle opening, brake actuation, vehicle speed, and steering wheel angle. The hydraulic pump may be a vane pump or a gear pump.

Seal assembly which is hydraulically actuated

Abstract: Improved shaft seal is provided wherein generally radially extending distendable diaphragms are used to adjust the sealed gap. A flushing lubricant is provided. The seal is particularly suited for use in gear pumps handling viscous materials such as heat plastified thermoplastics.

Cooling-liquid pump jointly driven with the lubricant pump

Abstract: Internal combustion engine with a lubricant pump 13 inserted into the crank casing and a cooling-liquid pump externally mounted onto the spur-gear cover 3 as an extension of the drive shaft 1 of the lubricant pump 13, the drive shaft 1 being divided into two shaft parts 23 and 24 between the drive gear 15 and the outside of the spur- gear cover 3.

Torque feedback transmission

Abstract: A torque feedback hydromechanical transmission having one or more planetary gear trains. In one embodiment, feedback comprises a variable displacement hydraulic motor mechanically interconnected to the input shaft and a fixed displacement hydraulic pump driven by the ring gear and supplying hydraulic fluid to the motor. Control over torque and speed ratio is exercised by adjusting displacement within the motor. In other embodiments some of the feedback is mechanical in order to reduce the load on the hydraulic motor and pump.

Gear pump or motor

Abstract: The gear machine has two gears (14, 15), which mesh in external engagement and are supported in axially movable bearing bodies (18 to 21). Formed on those sides of the bearing bodies which face in the opposite direction to the side faces of the gears are pressure zones (31, 32) which bring the bearing bodies into sealing contact with the side faces of the gears. This is important since the leakage losses are thereby kept low. There is, however the risk that the bearing bodies will be pressed on too hard, causing wear to the gears and the bearing bodies, or that, in the design as a gear motor, starting difficulties will be caused. In order to avoid this, recesses (40, 41; 43, 44) are formed on those sides of the bearing bodies (18 to 21) which are opposite to the pressure zones (31, 32), the said recesses being subjected to high pressure and further pressure zones being built up in them which counteract the abovementioned pressure zones. It is thereby achieved, firstly, that the contact pressures exerted on the side faces of the gears by the bearing bodies do not become too large and, secondly, that the pressing action of the bearing bodies becomes independent of viscosity, with the result that the said bearing bodies cannot lift off from the gears, something which can occur in the case of thin oils or high temperatures. This considerably improves the functioning ability of the gear machine.

A gear pump

Abstract: @ A gear pump has pairs of intermeshing gears 4, 5, 6 disposed in a housing 1. The gears of each pair are mounted on respective vertical shafts 2 and 3. An inlet path 17 leads to the gears and an outlet path 18 leads from the gears. A channel 20 provides a communication between an axial exit from the teeth of the gears of the lowermost pair on the inlet side and a tunnel 21 provides a communication between an axial exit from the teeth of the gears of the lowermost pair on the outlet side and the outlet path 18. This channel and tunnel enhance the dispersal of colourant, for example, in a surface layer of plastics material passing through the pump.

Hydrostatic crawling-speed drive arrangement for commercial vehicles

Abstract: The subject of the application is a change-over gear (4) for the crawling-speed mode, which is mounted directly on a change gear (3). This avoids the need for a separate closing cover for the change gear (3), and the entire engine unit (1, 2, 3, 4) has a very short axial constructional length. The crawling-speed drive takes place hydrostatically by means of a hydraulic pump (5) and a hydraulic motor (6). The pump and motor form a constructional unit with the change-over gear (4), so that the latter can be fitted subsequently at a low outlay in terms of construction and cost.

Machine, in particular internal combustion engine

Abstract: Machine, in particular internal combustion engine, which operates with a rotating piston accommodated in a housing, the rotating piston with its cylindrical basic shape being assigned a second, similar rotating piston, each of the pistons, which rotate in opposite directions, having a reduced diameter relative to the diameter of the basic shape over 180 DEG and the pistons being mounted in such a way that they interengage in the manner of the gears of a gear pump. In order to achieve satisfactory functioning of the machine without jamming the pistons, each front face of one piston (5) has a curved design such that each step (2') of the other piston (5') can execute a re-entrant movement on the corresponding front face (1) of the first piston (5).

Coating device for material webs

Abstract: A device for the application of a thin layer of a coating material (7) onto a material web (2) passing across a backing roller (1) comprises a slot nozzle arrangement (3) having a nozzle slot (4). In order to ensure uniform and sufficient delivery of coating material (7) across the length of the nozzle slot (4), the coating material (7) is delivered from a supply container (8) through a delivery channel (10, 11) extending across the coating width to the nozzle slot (4) of the slot nozzle arrangement (3) and in the delivery channel (10, 11) of the slot nozzle arrangement (3) a gear pump arrangement (12) is provided which has a plurality of rectilinearly aligned pump sections (13), each having two intermeshed pump gears (14, 15), the arrangement extending over the coating width and arranged with the distance pieces mounting the pump gears (14, 15) between the pump sections (13) to be easily removable. The distance pieces (16) are formed as carbon bearings and the parts are channeled for heating and cooling.

Drive speed change gear of tractor and the like

Abstract: PURPOSE: To realize multistage gear changes from the main shaft to the running part with both a hydraulic clutch change gear and an auxiliary change gear with gear sliding system and to reduce a transmission gear in its size by providing independent rotations of a clutch shaft and running drive shaft under the main shaft by means of aligning these axial cores and also by installing a main change gear with a hydraulic clutch system as well as the auxiliary change gear with gear sliding system CONSTITUTION: Four gears 40 are fixed to a main shaft C being supported with bearings 20, 30 above a transmission case A The clutch shaft D of a hydraulic clutch change gear is set under the main shaft C together with the running drive shaft G of an auxiliary change gear with gear sliding system by means of aligning the cores of both shafts to allow independent rotations Gears 62 are supported on the clutch shaft D, to be always engaged with the aforementioned plural gears 40 and a hydraulic actuator 69 is driven by high pressure oil contained in an oil duct 72 installed inside the clutch shaft D to come in contact with the clutch shaft D by the aid of a hydraulic clutch disk 70 A gear 62a above the clutch shaft D is used for backward movement and gears 62b, 62c and 62d are used for forward movement; low, second and third speed changes respectively COPYRIGHT: (C)1985,JPO&Japio

Direct-coupling control system for fluid gear in automatic vehicular transmission

Abstract: A direct-coupling control system for a fluid gear in an automatic vehicular transmission, having a fluid gear provided with input and output members; a direct-coupling mechanism capable of connecting the input and output members of the fluid gear mechanically and directly by a locking force which is determined on the basis of a function of a difference between a working pressure and an internal pressure in the fluid gear; and a control valves provided between a pressure supply source and the direct-coupling mechanism and adapted to control the working pressure. The direct-coupling control system includes a pressure retainer valve for controlling the internal pressure in the fluid gear so as to reduce the same in accordance with an increase in a vehicle speed or an engine output.

Device for preventing hydraulic clutch from shock in fitting

Abstract: PURPOSE:To prevent a hydraulic clutch from shock in fitting by regulating work ing oil pressure automatically on the basis of the signal from an oil pressure detector in fitting the hydraulic clutch. CONSTITUTION:Working oil sucked from an oil pan 1 by a gear pump 2 is introduced from an oil supply path 6 into a pressure regulating valve 6 to be regulated with respect to its pressure, and then introduced into an advancing cylinder 10 or a retreating cylinder 11 of a hydraulic clutch respectively through an advancing change-over valve 8 or a retreating one 9 from an oil supply path 7 after regulating pressure. On a servo valve 17 of a drive device 13 for the pressure regulating valve 6 is mounted a detecting guide pin 20 which moves integrally with the servo valve 17 and the position of which is measured by a potentiometer 21 to form thereby an oil pressure detector 22.

Static hydraulic speed change gear

Abstract: PURPOSE:To permit a compact arrangement in correspondence with the speed change gear, added with the periphery by arranging a pump and a motor separately each other CONSTITUTION:An installation basic body 2 onto a car 1 has a pump installation seat 2p and a motor installation seat 2m, and a variable-capacity type axial plunger type pump 3 and a fixed-capacity type axial plunger type motor 4 are fixed The oil passages l1, l2 for allowing a pump cylinder 7 and a motor cylinder 9 to communicate are formed onto the installation basic body 2, and oil passages n1, n2 for supplying oil from a charge pump 10 to the pump 3 are formed Other installation positions for the pump 3 and the motor 4 are permitted, added with that in the application example, and it is enough for the installation body 2 to have the installation seat and the oil passages