Showing papers on "Gear pump published in 1983"

Extruder viscosity control system and method

Abstract: An extruder control system and method controls melt temperature to maintain viscosity of the melt at the die. A constant volumetric flow to the die is delivered by a gear pump, the die is a fixed orifice, and pressure between the gear pump and the die is indicative of viscosity. Changes in pressure are sensed and compensating changes in temperature are effected to return the pressure and, hence, the viscosity to its previous value.

Method and apparatus for extruding thermoplastic material

Abstract: A gear pump assisted screw conveyor extrusion system utilizing a cartridge heating device disposed axially within the screw and having the drives for the gear pump and the screw correlated in speed to create relatively little pressure in the thermoplastic material being extruded such that relatively little mechanical working thereof occurs. The thermoplastic material is melted in the screw conveyor primarily by heat transfer from the cartridge heater and the gear pump is utilized for conveying the melted material under pressure to a subsequent work station. A relatively deep material-conveying spiral channel is provided in the screw for maximized extrusion output per revolution of the screw and minimized mechanical energy generation by the screw. A motionless mixer may be employed intermediate the screw and the work station to homogenize the melted material for reducing temperature gradients therein. The system advantageously is capable of extruding material at a substantially greater rate and a lower material temperature and with substantially increased power economy than conventional systems utilizing a high pressure, externally heated screw conveyor portion.

Transmission with two parallel driving shafts bearing two driving gears each meshed with same driven gear on parallel driven shaft

Abstract: A power supplying member supplies rotational power in a certain rotational direction to an input member of the transmission, and a power receiving member takes out power from a driven gear wheel shaft. Two driving gear wheel shafts extend parallel to the driven gear wheel shaft. First and second driving gear wheels are respectively rotatably mounted on the first and the second driving gear wheel shaft and meshed with a common driven gear wheel fixedly mounted on the driven gear wheel shaft. First and second synchromesh devices respectively selectively engage the first and the second driving gear wheel to the first and the second driving gear wheel shaft. First and second clutching mechanisms, each of which either can be disconnected so as to freewheel in both rotational directions or can be connected in the one rotational direction which is required for transmission of power through that clutching mechanism from the power supplying member rotating in the certain rotational direction so as to function as a one way clutch, are mounted to selectively transmit rotational power between the input member and the first and second driving gear wheel shafts respectively, both proximate to ends of the first and second driving gear wheel shafts closer to the input member.

Multistage gear pump and control valve arrangement

Abstract: There is disclosed a multistage gear pump and control valve arrangement comprising two hydraulic gear pump sets each having a suction port connected to a common sump and a discharge port for delivering hydraulic fluid to a circuit line. Only one of the discharge ports is continuously open to the circuit line while a check valve operates to connect the other of the discharge ports to the circuit line and prevent reverse flow. A regulator valve regulates the pump discharge to the circuit line by diverting fluid therefrom in response to circuit line pressure below a predetermined setting while both the discharge ports are delivering fluid thereto and by being responsive to circuit line pressures thereabove to connect the other discharge port to the sump to thereby relieve the associated gear pump set of hydraulic work while again regulating the pump discharge to the circuit line by diverting fluid therefrom but with only the one discharge port delivering fluid thereto.

Thermo-cementing and folding machine

Abstract: In a thermo-cementing and folding machine, a gear pump (26) operates to supply adhesive at a rate which is dependent upon the speed of rotation of a main drive shaft, by which workpiece feeding means of the machine is driven. The machine has also means (S6, 46 to 50) for varying the rate of feed of a workpiece by the workpiece feeding means without varying the speed of rotation of the main drive shaft. The ratio of the rotational speed of the shaft to the operating rate of the pump (26) is varied in response to variation of the workpiece feed rate. This arrangement is achieved by computer control (E, RAM, ADC, CPU, O/P, SMD), the gear pump (26) being driven by a stepping motor (M) for this purpose. In addition, at the end of each work cycle, use of a stepping motor facilitates 'suck back' of adhesive, and a 'fast forward' adhesive upon initiation of the next work cycle.

Polymer flow control apparatus

Abstract: Flow control of diluted polymer solutions is effected by utilizing positive-displacement flow devices such as gear pumps to withdraw flow energy in the form of shaft work. Control is obtained by varying the nature and amount of shaft work withdrawn, such as by operation of an electrical generating system, and the work so created may be used to provide operating power to a control system.

Control system for variable displacement hydraulic pumps

Abstract: A control system for variable displacement hydraulic pumps for use in a hydraulically operated construction vehicle having a fixed displacement hydraulic pump, a plurality of reducing valves operatively interlocked with work implement control valve units of the vehicle disposed on the delivery sides of the variable displacement pumps, control sections for controlling respective flow rate of the variable displacement pumps and equipment for exerting delivery pressures of both the fixed and variable displacement pumps and output pressure of the reducing valve on the control units. The control system exhibits three control functions, i.e., flow control for varying the angle of the swash plate of the variable displacement pump in proportion to the manipulating position of the respective work implement controlling valve, constant torque control in proportion to the delivery pressures of the variable displacement pumps, and cut-off control for reducing relief losses.

Change-speed gear in group-type construction

Abstract: A change-speed gear in group-type construction with a main gear-shifting mechanism and a group gearing connected thereto. A primary shaft drives a main shaft selectively via gears of an intermediate shaft or by direct coupling of the primary shaft and the main shaft and at different speeds. The gears of the main shaft furthermore mesh with gears of the group stages of the group gearing; these latter gears are freely rotatably mounted on an output shaft and can be coupled therewith. To eliminate components and to provide a compact change-speed gear, one gear of the intermediate shaft, in addition to its function as shifting gear of the main gear-shifting mechanism, at the same times performs the function of a reversing gear for the reverse group of the group gearing.

Continuous kneading and extruding device with gear pump

Abstract: PURPOSE:To make pressure adjustment at a discharge part by a quantity of feed of a material from a feeder, by controlling a production quantity of a kneading material. CONSTITUTION:A pressure sensor 4 for detection of pressure of a discharge part is provided on the discharge part 11, the discharge part 11 is so constituted that pressure adjustment at the discharge part can be obtained by a quantity of feed of a material to be kneaded from a feeder 3 by connecting the pressure sensor 4 with a motor 20 for driving of a feed mechanism 21 of the material to be kneaded in the feeder 3, and a production quantity of kneading material is controlled by the number of revolutions of a gear pump 2 as a delivery of the gear pump 2 is in a linear relation to the number of revolution of the pump its operation is done by setting up the number of revolutions of the pump at the same corresponding to the delivery of the pump, in the gear pump 2 of a constant capacity type.

Hydrostatic differential gear with brake energy recovery device for vehicles

Abstract: The invention makes it possible to convert the kinetic energy generated in the deceleration of vehicles into potential energy of a hydraulic accumulator and to utilise this for re-starting. Due to the fact that a differential gear present in the vehicle is replaced by a hydrostatic differential gear, however, no additional transmission components are required for this purpose other than the accumulators themselves and clutches and valves. Since the hydrostatic differential gear is a three-shaft epicyclic gear, in normal drive operation the drive power is hydraulically converted only when cornering and even then only to a limited extent. Fig. 1 shows in diagrammatic form as an example an embodiment of the invention with adjustable displacement volumes of the hydrostatic units. Another embodiment with constant displacement volumes is possible with additional hydraulic control elements. Further additional functions of differential gears such as, for example, free wheel effect, partial or 100% differential lock and the output of varying torques with adjustable torque ratio can be achieved in a novel manner.

Liquid-gas contacting apparatus and pump therefor

Abstract: A glycol dehydrator having a contacting vessel, a glycol regenerator and an improved glycol pump which is powered by glycol and gas flowing from the contacting vessel to pump glycol into the contacting vessel. The improved pump includes a positive displacement gear motor, a positive displacement gear pump, and a drive connecting the motor to the pump with the gear motor having a greater volumetric capacity than the gear pump. The gas from the gear motor is separated from the glycol and delivered to the regenerator burner.

Split torque hydraulic gearing

Abstract: 1. A transmission with hydraulic power shunt comprising : two epicyclic gear trains (5, 6) comprising two parallel output shafts (2, 3) ; a hydrostatic variator (7) comprising two variable-capacity hydrostatic elements (8, 9) mounted in a closed hydraulic circuit (10), each of the hydrostatic elements (8, 9) being mechanically connected to the sun gears (11, 14) of one of the epicyclic gear trains (5, 6) ; and two assemblies of gears (25, 26) having two different gear ratios which are capable of co-operating alternatively under the action of synchronisation control means in order to define two rotary speed ratios for the respective output shafts (2, 3) of the two epicyclic gear trains (5, 6), characterised in that the synchronisation control means comprise : a controlled locking device (43) mounted on at least one of the output shafts (2, 3) of the epicyclic gear trains (5, 6) permitting selection of one or other of the two gear assemblies (25, 26) ; means (47) for interrupting the closed hydraulic circuit (10) of the hydrostatic elements (8, 9) ; and an auxiliary hydraulic pump (44) mounted in an auxiliary hydraulic circuit (45, 46) so as to be able to feed one of the hydrostatic elements (8) and reverse its direction of rotation.

Multiple displacement hydraulic pump system with automatic displacement control for brake boosters and the like

Abstract: A pump sytem (16) for delivering hydraulic fluid to a load device, such as a hydraulic brake system. The system automatically switches from larger displacement to smaller displacement as pressure at the outlet increases. The pump system comprises one or more lower pressure pumps (72, 76) and a high pressure pump (74, 78) with an actuator (56) driving all pumps simultaneously. An unloading valve (102) is coupled with each lower pressure pump for dumping the output thereof in response to pressure of the fluid delivered to the load device. The actuator comprises an electromagnetic linear motor (122) which imparts an intake stroke to the pumps and stresses a spring (124) which releases stored energy for imparting the pressure stroke to the pumps.

Bearings for gear pumps

Abstract: The bore of a bearing bush for a gear pump has a first recess (17) which lies within a critical zone (15) of load concentration within the bush. Fluid under pressure is supplied to the recess (17) through a passage (18). A second recess (20) lies wholly outside the critical zone (15) and provides a reservoir of fluid which reduces cavitation resulting from low pressures arising from radical movements of a shaft within the bush. The second recess communicates with a zone of reduced pressure by way of a second passage (23).

Brake for a hydraulic motor

Abstract: A brake (2) with a hydraulically adjustable actuating device (22) for a hydraulic motor (1) is provided Its output shaft (13) is connected by way of a compensating device (14) to an externally toothed gear (15) This gear turns and rotates between two end walls (5, 7) in an internally toothed annular gear (6), fixed to the housing and forming displacement chambers (16) with the gear (15) Part of one end wall (7) is designed as brake plate (20), which by means of the hydraulically adjustable actuating device (22) can be pressed against the gear (15)

Gear pump with rotatable sections

Abstract: A pump housing containing an inlet and an outlet and enclosing two meshing pumping gear wheels is connected through an intermediate bearing plate to a transmission housing comprising a base arrangement and enclosing two meshing auxiliary gear wheels. An end bearing plate is disposed on the side of the transmission housing which is remote from the pump housing. The two bearing plates and the transmission housing are designed to be mutually mounted with respect to one another in four relative rotational positions, each rotated by 90° with respect to a primary axis of the gear pump. The pump housing and the intermediate bearing plate are designed to be mutually fastened to each other in two relative rotational positions, each rotated with respect to one another by 180° about the primary axis.

Automatically controlled thermo-cementing and folding machine

Abstract: In a thermo-cementing and folding machine, a gear pump operates to supply adhesive at a rate which is dependent upon the speed of rotation of a main drive shaft, by which workpiece feeding means of the machine is driven The machine has also a facility for varying the rate of feed of a workpiece by the workpiece feeding means without varying the speed of rotation of the main drive shaft The ratio of the rotational speed of the shaft to the operating rate of the pump is varied in response to variation of the workpiece feed rate This arrangement is achieved by computer control, the gear pump being driven by a stepping motor for this purpose In addition, at the end of each work cycle, use of a stepping motor facilitates "suck back" of adhesive, and a "fast forward" adhesive upon initiation of the next work cycle

Rotor for a rotary pump

Abstract: A rotary gear pump having inner and outer gear rotors of the type having respective inner and outer surfaces whose cross sections are determined utilizing the trochoidal curve, the inner gear rotor having trochoidal dimensions which either eliminate or diminish to a negligible amount the edge portion of the teeth which cause excessive wear, noise or inefficiency. In one embodiment of the invention, the dimensions of the inner gear rotor are such that C/K 0 ≦1 or f c /K 1 ≦1.1, where C is the rotary path diameter, K 0 =(A/B+1)×|B-2e|, K 1 =(n+1)×|1-2f e |, A is the diameter of the base circle, B is the diameter of the rolling circle, e is the eccentricity, n=A/B, f e =e/B, and f c =C/B. In accordance with a second embodiment of the invention, a comparable result can be obtained provided that the number of teeth on the inner gear rotor is equal to an integer closest to the ratio d 4 /2e, wherein d 4 is the minor diameter of the inner rotor.

Gear pump or gear motor

Abstract: PURPOSE:To keep good performance of a gear pump or motor, by forming an 8-shaped groove surrounding axial bores and L-shaped grooves at the top and the bottom of the 8-shaped groove, and inserting a seal member made of a plastics material having a small friction factor into each of these grooves in the manner that the seal members are protected against damages. CONSTITUTION:A gear pump or motor of this invention comprises a high-pressure chamber H connected to a high-pressure side B, a low-pressure chamber L connected to a low-pressure side A, and intermediate-pressure chambers M formed between the above two chambers L and H, into which intermediate-pressure fluid is introduced. In the surface of side plates 6, 6' located on the side not held in contact with the side faces of gears 2, 4, an 8-shaped groove 16 is formed in the manner of surrounding axial bores and L-shaped grooves 18 connected to the 8- shaped groove 16 are formed respectively at the top and the bottom of the 8-shaped groove 16. Further, an endless seal member 15 made of a plastics material having a small friction factor and havig a higher surface hardness than an oil-resisting rubber is inserted into the 8-shaped groove 16, and similarly, seal members 17 made of a material having the same properties as that of the seal member 15 are inserted into respective L-shaped grooves 16, in the manner that they are partially superposed on the seal member 15. Since, by employing such an arrangement, the seal members are protected against damages due to friction of themselves, it is enabled to keep good performance of the gear pump or motor for a long time.

Driving shaft of gear pump

Abstract: PURPOSE:To reduce the thrust force by forming a hollow path passing inside the shaft from the end section of a driving shaft to the front section of oil seal fitted along the driving shaft to prevent oil leakage so as to balance the liquid pressures applied to both side faces of the driving gear. CONSTITUTION:The liquid leaking through the gap between the side face of a driving gear 34 and a side plate 44 flow from the high pressure side (discharge path 48) to the low pressure side (suction path 46) and also reach the front face of an oil seal 54 through a hollow section 62 provided inside the driving shaft 34, and further return to the suction path 46 through a guide port 60. Accordingly, the liquid pressure in the hollow section 62 is made almost equal to the pressure in the suction path 46, and the cross section area of the side face of the driving gear 34 in the hollow section 62 is made equal to that of a driving shaft 32, therefore the liquid pressures applied to both side faces of the driving gear 34 are almost balance, thus generating no thrust force. Thereby, the thrust force applied to the driving gear 34 can be suppressed with small number of parts being used.

Apparatus for controlling continuous kneading and extruding apparatus

Abstract: PURPOSE:To carry out proper melting and extrusion, by a method wherein a pressure detector and a temp. detector are provided between a throttle mechanism provided to the discharge port of a continuous kneader and a gear pump succeedingly provided thereto to control the throttle mechanism and the gear pump by the measured values. CONSTITUTION:In an apparatus wherein a throttle mechanism 5 and a gear pump 7 are connected to the discharge port 4 of a continuous kneader in series and a molten and kneaded high molecular material is sent therefrom to, for example, a pelletizing apparatus, a pressure detector 15 and a temp. detector 16 are provided between the throttle mechanism 5 and the gear pump 7 and, when the measured pressure value is made higher (lower) than a predetermined range, the rotary number of the gear pump 7 is increased (reduced) and, when the measured temp. value is made higher (lower) than a predetermined range, the throttle mechanism 5 is opened (throttled) and, when the throttling degree of the throttle mechanism 5 is thrttoled (opened) too much compared to a predetermined proper control range, the gear pump 7 is controlled so as to reduce (increase) the rotary number thereof.

Driven gear for rotary gear pump

Abstract: PURPOSE:To reduce the weight of driven gear while to prevent noise when operating a gear pump, by making the driven gear of rotary pump with iron system sintered alloy while lacking the fill at the outercircumferential section. CONSTITUTION:The driven gear 3 (outer rotor) of rotary gear pump is made of ferro system sintered alloy to lack the fill directly from the outercircumferential section of driven gear 3 or through provision of a plurality of through-holes 6 at the outercircumferential section thus to reduce the weight of driven gear 3. Similar effect can be achieved when employing light alloy such as aluminum or sintered alloy such as ceramics for driven gear 3. Teflon or molybdenum coating is applied onto the surface of driven gear 3 to prevent noise.

Tooth-tip sealing mechanism for gear pump

Abstract: PURPOSE:To prevent the gear track of a seal block from becoming deep unnecessarily in high-speed, high-pressure operation of a gear pump, by selecting the substantial tooth-tip sealing length of the seal block at a proper value. CONSTITUTION:The length l from a point A to a point B, constituting the tooth- tip sealing length of a seal block 9, is selected to be nearly equal to an adjacent pitch P (but l>P). In the length l from the point A to the point B constituting the substantial tooth-tip sealing length, pressure in the tooth space is changed from the level of suction pressure to the level of discharge pressure, but the process of this pressure change is extremely stable. Therefore, by determining the loading force according to the pressure in the tooth space, it is enabled to prevent the gear track from becoming deep unnecessarily.

Two-stage internal gear pump

Abstract: PURPOSE:To hold pressure balance in the two-stage gear pump in such a way that each of first and second pumps which are communicated through a junction flow path has each pressure plate movably assembled just in the axial direction, and discharge area to lead the discharge pressure and area to lead the pressure in response to the both pumps are provided on the pressure plates. CONSTITUTION:Each of first pump 10 and second pump 15 is assembled into gear holes 4, 5. Pressure plates 9, 14 are laterally provided on each pump side, and they are constituted such that they can not be turned by pins 32, 33, and they can move a little in the direction of a shaft 18. The pressure plate 9 has a seal member 34 inserted on the reverse, it is comparted into pinion neck pressure area 36, first discharge pressure area 37, second discharge pressure area 38, outlet port pressure area 39, and inlet port pressure area 40, and pressure area with the phase displaced by 180 degrees to the pressure plate 9 is also provided on the reverse of the pressure plate 14. Discharge pressure of the pumps is led into the first and second discharge areas.

Service jack including rack and pinion driven pump piston

Abstract: A service jack for use in jacking vehicles and the like and including a lift member supported by a frame for movement between a lower position and a raised load carrying position. A hydraulic lift cylinder is provided for causing selective movement of the lift member between the first position and load carrying position. A hydraulic pump is also provided for selectively forcing hydraulic fluid into the hydraulic lift cylinder to cause movement of the lift member from the first position to the second position. The hydraulic pump includes a pump cylinder, and a pump piston housed in the pump cylinder, a pinion about an axis, said pinion including gear teeth. A rack is fixed to the pump piston, the rack including gear teeth meshing with the gear teeth of a pinion supported by the frame for rotation, the pinion being rotably driven by pumping movement of the jack handle.

Helical gear pump

Abstract: In an internally-meshing helical- gear pump, which may be a hand- operated borehole pump, Fig. 1 (not shown), the stator 40 is secured at one end only to a barrel 32, so that an annular space 41 is provided around the remainder of the stator and the outlet pressure and temperature is communicated to this space to provide automatic temperature and pressure compensation. Mounting of the stator at one end only also permits a narrow diameter construction suitable for borehole pumps.

Fuel feed device

Abstract: PURPOSE:To smoothly operate an engine, in the gasoline injection internal combustion engine, by metering a flow of fuel with a servo motor driven gear pump and controlling operation of a pump thrugh operational condition detecting sensors and electronic controller. CONSTITUTION:At starting, intake air flows in an engine 1, fuel is simultaneously forcibly fed to a gear pump 11 by a fuel pump 17, and pressure is held almost to constant by a fuel pressure regulator 19. This fuel is pressed into an injection nozzle 9 while being continuously metered by a gear pump 11. The gear pump 11 is driven by a servo motor 12 and controlled by a control signal of an electronic controller 13. This controller 13 processes signals of an intake air quantity sensor 14 and water temperature sensor 15 to calculate an optimum fuel flow to an operational condition and feed a control signal to the servo motor 12, and the gear pump 11 can meter a fuel flow always corresponding to the operational condition, thus smooth operation can be performed to obtain stable idling operation.

Manufacture of polyolefin group resin molding

Abstract: PURPOSE:To manufacture the titled molding, the surface thereof is fine and which is homogeneous, by introducing a melting material extruded from an extruding machine to a cross head through a gear pump for transporting a high- viscosity meltage. CONSTITUTION:A gear pump 13 for transporting the high-viscosity meltage is installed between the nose section of the extruding machine 10 with a screw 4 and a cross head 12. With the gear pump 13, gears 14 mutually turned outward are mounted oppositely into a main body, a compressing section (space) is formed to a peripheral section, and action of which the meltage is drawn near and out by material pressing action is strengthened. When a polyolefin group resin composition such as a silane crosslinking polyolefin group resin composition is used, characteristics obtained can be determined only by the composition and the number of revolutions of the gear pump when the number of revolutions of the screw is set so that resin pressure applied to the nose of the extruding machine is kept within a range of 80-130kg/cm , and stable characteristics can be maintained.

Gear machine for self-lubricating pumping media

Abstract: A gear machine is proposed with two gears 4, 5 meshing externally in a housing 1, 2, 3, which gears are supported in axial pressure-compensated bearing elements, in which the oil leaking from the bearing points of the gears 4, 5 is led off through a leakage oil guide in the area of the housing recess 10 for the drive shaft 6 of a gear 4 into the drive or output chamber 6 of the drive shaft 6. To this end the drive shaft is preferably provided with a longitudinal through-bore 15, which is flow-connected to the leakage oil chambers 12 of the gear machine (Fig.1).