Showing papers on "Gear pump published in 1970"

Liquid and air mixing gear pump

Abstract: The air intake ports of a liquid and air sucking and mixing gear pump are put into communication with the atmosphere through a collecting tank or chamber, in which the small amounts of foamy liquid-and-air emulsion flowing out from said ports during the stopping time of the pump are collected, and from which the amounts of emulsion are again sucked back into the pump as soon as the pump operation is again started.

Variable sealed hydraulic pump or motor

Abstract: An internal gear pump employs plates at opposite ends of the gears with the plates normally slightly spaced from the axial ends of the gears but deformable into sealing relationship with the gears in response to pressure and/or temperature. The outer periphery of the plates is fixed to the housing and, in the preferred embodiment, the plates are bi-metallic so that as they heat they move to close the space. High pressure is communicated to the side of the plates remote from the gears so as to pressure bias the plates toward the gears. The plates provide an automatic adjustment of the running clearances as the temperature and/or pressures of the device change.

Rotor and gear assembly for rotary mechanisms

Abstract: An improved rotor and gear assembly for rotary mechanisms, such as combustion engines or the like, in which the gear is seated in one face of the rotor and secured to the rotor by a plurality of circumferentially spaced fastening means extending from the face of the rotor opposite from the gear, through the rotor, into the gear to thereby flexibly secure the gear against radial movement due to thermal distortion resulting from cyclically varying stress loads and thermal induced stresses.

Hydraulic controller including rotary valve

Abstract: A hydraulic controller, for power assist steering or the like systems, which controls the flow of pressurized fluid between a main power fluid pump and a servomotor such as a hydraulic cylinder. The controller includes a rotary valve assembly which confines the fluid within the controller to a valve chamber, enabling the controller to be utilized in remote or integral power steering applications such as rack and pinion gear system without admixing the lighter servomotor operating oil from the heavier gear lubricating oil.

Gear pump for viscous thermoplastic melts

Abstract: A gear pump having two rotatable intermeshed gears mounted in a hollow cavity of the pump casing for transporting and discharging a viscous thermoplastic melt, the hollow cavity being enlarged at the inlet side of the pump casing to provide an elongated arcuate wedge-shaped filling chamber extending from the inlet outwardly around each gear to converge onto the gear periphery in the circumferential direction of the transported melt.

Positive displacement fluid pumps

Abstract: A positive displacement fluid pump adapted especially to be used in a power steering circuit for an automotive vehicle, said pump including a pump housing in which is formed internal high-pressure cavities in communication with the discharge side of the pump and internal porting for controlling discharge and entry of fluid for the pumping chambers of the pump, an integrated reservoir surrounding the housing and a flow control valve assembly in fluid communication with supercharged portions of the pump, the overall pump assembly being characterized by reduced axial and radial dimension.

Fumigation devices for supercharged diesel engines

Abstract: Device for the permanent atomization of liquid fuel into Diesel engines comprising a volumetric pump interposed in the engine air induction pipe, whereby pipes for delivering liquid fuels and additives, such as oil, open through jets into said air induction pipe, upstream of the volumetric gear pump operated simultaneously as a pump and as an atomizer.

Hydraulic lift controls

Abstract: A control apparatus for hydraulic lifts of the type associated with elevating mechanism for vehicle bodies or dump trucks. Fluid under pressure is supplied to the hydraulic cylinder only when the gear shift lever of the transmission is in neutral position and the brakes of the vehicle have been applied. An electric clutch is interposed between the transmission power take-off and the pump which supplies fluid to the lift cylinder and this clutch is actuated only when the gear shift lever is in neutral position.

Combined auxiliary power and engine starter systems

Abstract: To permit an auxiliary power unit to start an engine without drastic temporary reduction of the running speed of that unit, the engine is coupled to the auxiliary power unit by a differential gear drive whose third element drives a gear pump having in that outlet which is the delivery outlet when the auxiliary power unit drives the engine, a normally unloaded pressure retaining valve which, to produce starting torque for the engine, can be loaded to build-up a preset delivery pressure. A pre-loaded pressure-retaining valve may be provided in the other pump outlet in order to permit transmission of torque from the main engine to the auxiliary power unit, both valves being by-passed in the respectively reverse direction by non-return valves.

Gear pump with travel limited tied wear block

Abstract: A three-gear pump for pumping nonabrasive fluids having a center gear and two outer gears intermeshing with the center gear. Two pivotable and movable peripheral tooth-sealing members having respective arcuate wiping surfaces engage each of the outer gears and the center gear. The sealing members are positioned adjacent the outlets of the pump. The sealing members are capable of only limited movement toward the gears due to respective stop elements integral with the pump housing and respective contact elements integral with the sealing members adapted to engage the stop elements. The sealing members are also pivotable about an axis transverse to the axes of rotation of the gears. As the sealing members wear due to contact with the gear teeth, the contact elements will respectively advance toward the stop elements until they contact one another to transmit the load on the sealing members to the housing.

Integrated pump-control system using a unitized pump

Abstract: An integrated fuel pump and control system has a unitized pump which includes three pumping circuits. A first pump circuit includes a positive displacement gear pump to provide fuel to a gas turbine engine from startup to just below idle. A second pump circuit includes a high-flow centrifugal pump, and a third circuit includes a low-flow centrifugal pump. A pump switching arrangement automatically switches from the first circuit at an engine speed slightly below that of ground idle to either the second or third circuit depending on the engine fuel requirements.

Multicycle self-balancing gear pump

Abstract: A multicycle self-balancing gear pump incorporates a variable staging valve for changing the amount of discharge flow of the pump. The pump employs seven gears with six gear meshes at pumping states and the variable staging valve controls both discharge and bypass porting of the pump. In one embodiment the staging valve is a rotary valve having a pair of valving members for controlling the discharge portion and a pair of valve members for controlling bypass porting. Another construction employs a linearly operated staging valve for controlling porting of the liquid flow.

Longwall mining machine

Abstract: A longwall mining machine is described which has cutting rolls pivotally mounted about horizontal axes on a machine housing. The support arms enclose spur gears which are in engagement with each other and are adapted to transmit power from a drive motor in the machine housing to the cutting rolls at the free ends of the support arms. The two outermost spur gears in each arm form a gear pump which pumps the oil accumulating in the outer end of the support arm, when in a downwardly inclined position, back into an oil sump in the machine housing.

Mechanical gear drive

Abstract: A gear drive arrangement for rotating a ring gear of large diameter, as commonly used for rotating the rake structure for a slurry agitator, sedimentation tank, or the like. The gear drive incorporates a novel mounting and torque reactor device on which a plurality of gear members are positioned which equally distribute the torque to the ring gear. The planetary gears are driven by a pinion gear which is flexibly suspended from a gear reduction device. The tension device includes an indicator means for visual observation of the torque being transmitted to the ring gear and rake structure at a given time.

Variable high speed gear pump

Abstract: A GEAR TYPE FLUID PUMP HAVING PUMPING GEARS PROVIDED WITH BOOSTING CHANNELS AND COOPERATING HEAD CHANNELS WHICH SUPPLY FLUID FROM THE PRESSURE OF THE PUMP VIA THE BOOSTING CHANNELS TO THE MATING POCKETS OF THE ASSOCIATED PUMPING GEAR TO THEREBY IMPROVE THE EFFICIENTY OF THE PUMP. THE OIL ADMITTED INTO AND CARRIED IN THE BOOSTING CHANNELS IS SLUNG RADIALLY OUTWARDLY THEREFROM BY CENTRIFUGAL FORCE INTO THE GEAR POCKETS OF THE MATING GEAR TO THEREBY REDUCE THE TENDENCY OF THE FLUID BEING PUMPED TO BE VAPORIZED IN THESE POCKETS AS THE GEARS DISENGAGE ON THE INLET SIDE OF THE PUMP, THUS REDUCING GASSIFICATION IN THE PUMP AND WEAR ON THE GEAR PUMPING TEETH.

Automatically revolved washing apparatus

Abstract: A washing apparatus is provided which comprises means for adjusting the revolving speed of nozzles about an axis of a head body. The revolution of the nozzles, which are revolved by the reaction forces of the jet flow of flushing water through the nozzles, operates a gear pump provided in the head body. The pressure load upon the gear pump is adjusted from the outside of the head body so that the revolving speed of the nozzles about the axis of the head body can be adjusted apart from the speed of the jet flow of the washing water through the nozzles.

Reverse and reduction gear for ships

Abstract: A reverse and reduction gear for ships wherein three clutch units are arranged arcuately around a large gear mounted on a thrust shaft, each clutch unit comprising an auxiliary shaft, loosely carrying driving and driven gears, and a clutch interposed between the two gears, and the driving gear of the center clutch unit is coupled to the input shaft and meshed with the driving gears of the clutch units on both sides, said driven gears of the three clutch units being meshed with the common large gear on the thrust shaft.

Torquemeter reduction gear

Abstract: A reduction gear including a pair of helical parallel gears, the driven gears being integral with a shaft axially movable within a hydraulic cylinder, the pressure of fluid being proportional to the power transmitted.

Liquid pump or motor

Abstract: A hydraulic pump or motor, of the type which operates by the meshing of gears, has a pair of meshed bevel gears. The housing of the pump or motor has ports on either side of the zone where the teeth are in mesh. Within the zone where the teeth are out of mesh there is an arrangement for closing off the spaces between the teeth. Fluid under pressure is admitted to the bearing surfaces of the gears so as to oppose loads applied to the gears by the operating hydraulic fluid pressure.

Improvements in or relating to Pumping Apparatus

Abstract: 1,189,051. Shaft couplings; breaking pieces. INDUSTRIEWERKE KARL-MARX-STADT, VEB. 9 Jan., 1968, No. 1286/68. Headings F2U and F2X. [Also in Division F1] In pumping apparatus comprising gear pumps 1, 2, the driving shafts 9, 10 are splined and connected to each other by splined rings 12, 13 and shear pins 15, which fail when the torque becomes excessive. The rings may be aligned with each other by a spigot 14.

Improvements in or relating to High-Pressure Hydraulic Gear Pumps

Abstract: 1,198,805. Gear pumps and motors. PLESSEY CO. Ltd. Sept. 29, 1967 [Oct. 7, 1966], No. 44926/66. Heading F1F. In a hydraulic gear pump of the kind in which to provide a seal between the gear teeth tips and the housing to prevent back flow, the gear teeth tips are bedded into the housing adjacent the low pressure port, the housing, which is usually of a material, e.g., aluminium alloy, appreciably softer than the material, e.g., steel, of the gears, is made of material of much greater strength such as cast-iron or steel and provided with an insert or set of inserts separate from the housing, which for a small portion of the circumference surrounding each of the gears in a zone adjacent the low pressure port co-operates with the tips of the gear teeth to isolate the low pressure port from the high pressure port. An insert 23, Fig.3, of aluminium alloy is formed with arcuate flanks 24, 25 which co-operate with the gear teeth tips and with a recess formed in each of side plates 19, 20 which support the journals and abut the gears. The insert is convexedly curved at its back and at its ends supported in corresponding shaped recesses in the end walls 22 of the housing. The insert may be made integral with one of the side plates. At least one of the side plates on its face remote from the gears may be subjected to the pressure at the high pressure port to seal the side plates with respect to the end faces of the gears. When unduly worn the insert may be readily replaced.

Improvements in or relating to motor vehicle steering devices

Abstract: 1,204,385. Hydrostatic steering devices. ZAHNRADFABRIK FRIEDRICHSHAFEN A.G. 10 Nov., 1967, No. 51325/67. Heading B7H. [Also in Division F2] A manually operated or power assisted steering device for motor vehicles, comprises a fluid pump 4 driven by rotation of the steering shaft 2 and connected via a valve member 60 to a servomotor 9 acting on the steered wheels of the vehicle, the rotation of the steering shaft 2 being geared up by an internally-toothed ring gear 10 fast therewith and meshing with an externally-toothed pinion 11, which is rotatably mounted eccentrically on the shaft 14, 15 driving the pump 4, but which is substantially prevented from rotating about its own axis and is constrained to a circular orbit about the axis of the ring gear 10. In one embodiment, the pinion 11 has lugs 28 engaging grooves 21 and 22 formed in the ring 20, the grooves 21 and 22 engaging the bushed pins 23 and 24 of a cardan bolt 25 which is universally mounted (but capable of only limited rotation) by pins 30, 31 engaging slots 32, 33 in a housing 34. A highpressure fluid power-assistance pump 6 is continuously driven by the vehicle and normally its output is directed back to the reservoir 7 by a control device 8 which comprises a rotary valve member 60 secured to the cardan bolt 25 and a fixed valve sleeve 61, comprising longitudinal control grooves 96-99a and b, 92-95a and b co-operating with each other and with annular grooves 75-79 in the housing 16. When the steered wheels offer resistance to movement greater than a certain value, then the cardan, bolt 25 rotates a limited amount against springs 66, 67 and high pressure fluid is then delivered by the control device 8 via channels 50 1 and 51 1 , or 52 1 and 53 1 to the suction chambers of the twin-flow gear pump 4 and thence via channels 52 1 and 53 1 , or 50 1 and 51 1 back to the control device 8 and thence to chamber 87 or 88 of the servomotor 9, the chamber 88 or 87 discharging fluid via the control device 8 to the reservoir 7. The rotary valve member 60 may be constructed so that a shock at the servomotor 9 is or is not transmitted by the fluid to the pump 4 to produce a movement of the member 60, so that the power assistance may or may not counteract the shook. In another embodiment, the cardan bolt 25 is dispensed with, and the pinion 11 is connected to an adjacent disc capable of a limited rotary movement (against spring action) which rotates an axially displaceable control valve member. Rotation of the control valve member causes axial displacement thereof by means of coarse screw-threads on the member and the fixed housing 16, the control valve member having circumferential control grooves co-operating with the circumferential grooves in the housing 16. The disc is centred by a lever acted oppositely on by two springs.

Process for the Polymerization of beta-Lactones.

Abstract: 1,180,044. Continuous polymerization of betalactones. SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ N.V. 26 Aug., 1968 [11 Sept., 1967], No. 41319/67. Heading C3R. In the manufacture of polyesters by the bulk continuous polymerization of alphasubstituted beta-lactones in the presence of a polymerization catalyst, the polymerization is effected in the working space of a reciprocating pump or a gear pump (e.g. an external gear pump, an internal gear pump or a lobe pump). The feed to the pump may be a monomerpolymer mixture obtained by prepolymerization of the lactone at below 80 ‹C. and may also include a chain-transfer agent, a stabilizer, filler, pigment, dye, antioxidant, nucleating agent, antistatic agent or dyeability-improving compound. Examples describe the polymerization of pivalolactone using tributyl phosphine as the catalyst and, possibly, trinonylphenyl phosphite or p-chlorobenzene diazonium hexafluorophosphate as a stabilizer.

Improvements in or relating to High Pressure Internally Meshing Gear Pumps or Motors

Abstract: 1,191,472. Gear pumps and motors. O. ECKERLE. Aug. 11, 1967, No. 36898/67. Heading F1F. An internally-meshing gear pump (or motor) comprising a driven externally toothed pinion 1, Fig. 2, an internally toothed ring gear 3 meshing therewith and a sickle-shaped filling piece 2 disposed between the gears and wherein the ring gear is mounted solely on the filling piece, includes pressure zones 6 1 , 7 1 , connected to and diametrically opposite the pressure chamber 6, 7 of the pump (or motor) so that resultant forces P R , and T i , applied to the pinion and ring gear respectively are balanced by resultant forces -P R , h and -P i , h in the zones 6 1 , 7 1 respectively. Further, to avoid radial leakage gap losses and compensate for wear it is necessary for the pinion 1 to lie tightly against a part 9 and sealing edges 4, 4 1 or the filling piece 2 and the ring gear to lie tightly against a part 8 and sealing edges 5, 5 1 of the filling piece. To accomplish this it is necessary to apply a force P D , Fig. 3, vertically downwards on the ring gear which tends to urge the edges 4, 4 1 and 5, 5 1 on the filling piece farther downwards so that it becomes necessary for the circular arcs subtended between the edges 4, 4 1 and between the edges 5, 5 1 not to exceed 180 degrees resulting in residual forces # P R , h and # P i , h proportional to the tooth pitch acting on the pinion and ring gear respectively. The force # P R , h may be ignored since it is taken by the pinion shaft bearing but the force # P i , h needs to be compensated for. The resultant of the compensating force -# P i , h and P D is at an angle α, Fig. 5 to the horizontal and at this location a radial piston 13, subjected on its rear face to the pressure in the pressure chamber is disposed. A spring 14 provides the pressing pressure on starting and a bore 15 relieves hydro-statically the sliding between the piston and the ring gear. A slot 10 in the filling piece and a pin 11 fixed to the casing provides for downward movement of the filling piece. Recesses 16, 16 1 on the axial end faces of the filling piece reduces the contact surface between the piece and laterally adjoining elements. Axial sealing of the pressure chamber 6, 7 of the pump is effected by pistons 17, 17 1 , Fig. 7 (not shown) subjected on their rear faces to discharge pressure. Axial compensating pistons may also be provided in the vicinity of the pressure zones 6 1 , 7 1 , to compensate for the axial gaps caused by the pressure in these zones. In a modified embodiment, the separate axial pistons sealing the ends of the pressure zones and the pressure chamber are replaced by a single piston.

Charge means for foamable liquid such as polyurethane

Abstract: The apparatus is esp. useful for dispersing polyurethane foam between metal sandwich plates, ensuring that the expansion of the foam is in a plane at right angles to the plane of the sheet, thus ensuring max. anisotropy of physical properties in this plane. The individual components of the foam are fed into a central mixer from which multiple feed pipes take it to inlets to the dispensing head which extends across the full width of the plate to be covered with the liquid. The dispensing head is a horizontally split block contng. effectively a double gear pump extending for the full width of the cavity within the head. The pipes from the mixer thus feed the inlet chamber of this pump at spaced intervals across the width of the gears. The outlet slit is variable in width by means of a flap operated by a cam from one side. The gear pump is chain driven, and the surface of the plate thus evenly covered with no wiping action as it progresses beneath the slit.

Wet type friction clutch

Abstract: The friction facings in an automotive friction clutch of the wet type are supplied with liquid lubricant by a gear pump mounted on the clutch release bearing in such a manner that the stator of the pump is secured against rotation by the clutch release fork while the pump rotor is connected with the release levers on the clutch casing for joint rotation whenever the associated engine is operated.

Braking roller for use in roller conveyors or the like

Abstract: 1,205,603. Braking rollers for roller conveyers. E. LAGEMANN. 12 Sept., 1967, No. 41474/67. Heading B8A. [Also in Division F2] A braking roller for a roller conveyer includes a gear pump 17, 18 of which chambers on the pressure side and on the suction side are connected only by clearances between the gears 17, 18, and by clearances between the gears and walls of the pump casing 8, 10. The gear 18 is secured on a shaft 19 which is driven, via a pinion 20, by a ring gear 13 non-rotatably mounted on a stub axle 6. The shell 1 of the roller is supported on bearings 4, 5 and is secured to the pump casing 8. A bearing 14, 15 is provided between the ring gear 13 and the casing 8. Rotation of the roller produces a planetary action of the pinion 20 to drive the pump gear 18. In a modification, Fig. 2, the pressure and suction sides of a pump 42, 43 are connected by channels 40 of which the bore is adjustable by a screw 41 for varying the braking torque. The channels may have exchangeable jets for adjustment of the braking effect. For limiting the torque, there is provided a friction coupling 29 which may also have means for delaying engagement of the coupling. Such provision results in improved starting up characteristics of heavily loaded rollers. In addition to or as an alternative to the friction coupling a dog coupling may be provided, Fig. 4 (not shown). A freewheel coupling, Fig. 5 (not shown), permits pushing back of a load without any braking. An outer shell 23 for the roller 22 enables material which has been heated to high temperatures to be conveyed. Air flow is aided by perforations 26. There may be separate reservoirs for the pressure medium and the pressure produced may be used to operate the friction coupling hydraulically.

Studies on Volumetric Efficiency and Theoretical Delivery of Gear Pumps

Abstract: The volumetric efficiency of the gear pumps calculated from the equations which are shown in the past publications gives a value of over 100%. Therefore, the author calculated the theoretical delivery of the pumps with arbitrary shapes of tooth curve in the lengthwise direction, results of which can be used for the calcularion of the efficiency. Furthermore, physical behaviours of fluids which cause differences in theoretical delivery due to both the differences in tooth curve and backlash are clarified. From the experiment, it was found that the cases showing over 100% efficiency were restricted to the pumps having a backlash in the gears. Discussions are made on this phenomenon and the following equation for calculating the volumetric efficiency, ην is presented. ην=1-(q1+q2+q3+κΔV)/(Vth1) where, Vth1 is the theoretical delivery for the non-backlash pump ; and q1, q2 and q3 are leakages through the gear tip, gear side and backlash respectively ; ΔV is approximately equal to the difference between the two theoretical deliveries Vth1 and Vth2, where Vth2 is the delivery for the pumps having a backlash ; κis a non-dimensional constant and ΔV=0 for the non-backlash pumps.