Showing papers on "Gear pump published in 1979"

Fuel delivery system and method

Abstract: A fuel delivery system for supplying high pressure fuel flow to a gas turbine engine which includes a first stage ejector pump driven by a second stage compressor which is driven by a hydraulically operated turbine supplied with fuel flow from a third stage gear pump.

Hydraulic fan drive system including variable displacement pump

Abstract: A vehicle engine accessory drive system is disclosed including a hydraulic fan motor (M) and a power steering gear mechanism (SG) in series flow relationship. The system includes a variable displacement power steering pump assembly (P) which is the sole source of fluid for the system, and includes a variable displacement pumping element (PE) and a displacement control valve (CV). The displacement control valve includes a pilot valve (35) which is responsive to the demand for cooling to vary the fluid pressure in a signal chamber (63). The displacement control valve is operable to communicate a control fluid pressure to a stroking cylinder (SC) to control the fluid delivery rate of the pumping element. At a first relatively lower temperature, the displacement control valve maintains the fluid delivery rate of the pumping element at Z, and at a second relatively higher temperature, to maintain the fluid delivery rate at X. Controlling the fluid flow rate out of the pumping element in response to demand for cooling results in a substantial savings of pump input horsepower, especially when the hydraulic fan motor is operating at the minimum fan speed.

Helical gear pump or gear motor with optimal relief grooves for trapped fluid

Abstract: In an external or internal gear pump or gear motor with one pair of helical spur gears, the trapping of fluid in the enclosed tooth cavity and the risk for cavitation in the said enclosed tooth cavity is considerably reduced by the shift of the pressure port connected and the suction port connected relief grooves at the leading lateral face of the helical gears in the direction of the suction port and the shift of the pressure port connected and suction port connected relief grooves at the lagging lateral face of the helical gears in the direction of the pressure port.

Multiple-power gear drive transmission and drive assembly including such transmission, and brake energy accumulator

Abstract: A multiple-power gear drive transmission comprising a planetary differential gear drive including a plurality of drive elements such as sun gear, web gear and internal gear. A gear drive input shaft is connected with at least one of the drive elements; a gear drive output shaft is connected with another of the drive elements; a first positive-displacement machine operable in both directions as pump or motor is coupled to a third of the drive elements for controlling the direction of rotation and speed of rotation thereof; and a second positive-displacement machine operable as a pump or motor is energy-transmissively coupled with the first positive-displacement machine. The planetary differential gear drive includes two of the sun gears which have different diameters; on web gear being arranged dual planetary gears, the gears thereof meshing with the sun gears and with an internal gear wherein the larger sun gear is connected with the gear drive input shaft. Shift couplings selectively connect the second positive-displacement machine in dependence upon the speed of rotation of the gear drive output shaft with either the gear drive output shaft or with the smaller sun gear.

Hydraulic motor/pump with variable mechanical advantage

Abstract: The invention is an efficient hydraulic motor/pump whose mechanical advantage can be varied while it is operating. Preferred embodiments described include a multi-cylinder reciprocation motor/pump, a variable level power extraction system used with a wave generator, a hydraulic transformer and a hydraulic autotransformer.

Marine transmission gear unit with double drive

Abstract: A marine transmission gear unit with double drive where two driving engines are arranged offset from and on one side of and parallel to a propeller shaft axis and on opposite sides of gear train assembly including a common pinion gear and a greater wheel gear coupled to the propeller shaft. The two driving engines are arranged to drive the greater wheel gear by way of the pinion gear. An intermediate gear unit is coupled between the common pinion and at least one of the driving engines and a clutch device is disposed in the drive train adjacent the greater wheel. One or both engines are coupled to the common pinion through an intermediate gear unit. The engines can be codirectional in one direction or the opposite direction or can be contra-directed one relative to the other. The engines can be axially offset or coaxial. The clutch device may comprise an overriding clutch assembly. The intermediate gear unit may comprise either a spur gear and a planetary gear assembly, or a pair of planetary gear assemblies. Change of rotation within the gear unit can be effected easily.

Dynamic cooler apparatus for molten thermoplastic material

Abstract: A dynamic cooler apparatus is provided for dynamically cooling molten plastic extrudate while pumping metered amounts of that extrudate to an extrusion die or the like. The dynamic cooler apparatus utilizes bi-helical gears in a gear pump configuration in a housing in which a heat exchange medium is circulated. The heat exchange medium is also circulated internally of the gears so that the gear teeth and the housing act to cool discrete volumes of extrudate from four sides defined by the gear teeth and the internal surface of the housing. The bi-helical gears are driven to minimize loading between the teeth thereof and to permit the teeth to be as small as practical to present more cooling surface for a given cross-section of extrudate and optimize the heat transfer capability of the dynamic cooler apparatus. Provision is also made to use the molten extrudate as a lubricant for the shafts and bearings of the bi-helical gears.

Methods and apparatus for gear pump lubrication

Abstract: A gear pump structure is provided having a housing with a pump chamber, a suction chamber and a discharge chamber communicating with said pump chamber on opposite sides thereof, a suction port and a discharge port in said housing communicating respectively with the suction chamber and discharge chamber, each of said ports have spaced apart inlet and outlet means, said suction port being contoured to provide on introduction of fluid into the inlet end a point intermediate its inlet and outlet means having a pressure higher than the pressure at the inlet and outlet means, at least one pair of meshing gears mounted for rotation in said pump chamber and each having two axially spaced trunnions, a plurality of bearing means in said housing each having an axial bore mounting said trunnions for rotation in the pump chamber, drive means for rotating said gears so that liquid which is drawn through the suction port into the suction chamber is engaged by teeth on said gears and transferred to the discharge port under pressure, fluid passage means connecting the ends of said bearing means remote from the gears with said point of high pressure intermediate the inlet and outlet means of the suction port delivering fluid to said bearing means ends, a recess in each end wall of the pump chamber connecting the bearing means along a line spaced from a center line through said bearing means toward the suction chamber and communicating with said suction chamber as the gears rotate, said recess defining with the teeth of the rotating gears a low pressure chamber receiving fluid from the fluid passage means through the bearing means into said recess whereby low pressure lubrication of the bearing means and trunnions is provided.

Hydraulic control system for variable displacement pumps

Abstract: A hydraulic control system for variable displacement pumps, comprising at least two variable displacement pumps, a prime mover for driving the variable displacement pumps, a fixed displacement pilot pump driven by the common prime mover, a pressure compensating valve comprising a two-stage proportional pressure reducing valve and a negative proportional pressure reducing valve, the pressure compensating valve being connected to the variable displacement pumps and the fixed displacement pilot pump, and at least two servo boosters each being mechanically connected to the respective variable displacement pumps for controlling the displacement therefrom, the servo boosters being connected to the fixed displacement pilot pump and the pressure compensating valve and controlled thereby.

Switching device for variable speed gears in machine tools

Abstract: A switching device for variable speed gears in machine tools having an assembly which includes a plurality of axially disposed, rotatably-driven cam discs, each of which is associated with an electric microswitch. Non-rotatable spacers serve to position the cam discs. A spherical key bed clamp axially clamps the cam discs together while permitting rotation of individual ones thereof. A non-rotating indicating disc displays the present RPM or respective gear stage. A shock absorber in the individual gear trains between switching bars and their respective electric motors provides sufficient damping and cushioning to prevent a hard start-up impact when the motor is switched on or when a sliding gear block is engaged. The shock absorber may include an elastic linkage or an elastic spur gear in a toothed wheel gear reduction unit located between the motor drive shaft and the link shaft.

Gear pump having fluid deaeration capability

Abstract: A gear pump (10) has a pair of intermeshing gears (12,14) located in a corresponding pair of intersecting cavities (16,18) in a housing (20), and air bleed passages (60) are defined in the housing (20) for passing entrained air collected in the fluid at the tooth roots (42) of the gears (12,14) as a result of centrifugal force away from a preselected region (61,62) of each of the gear cavities (16,18). Preferably, a pair of arcuate air bleed passages (64) are formed in the housing (20) and are located in a trailing portion (62) of the preselected region, and a pair of grooves (70) transmit pressure from a discharge opening (48) back to the tooth roots (42) to positively encourage movement of fluid with entrained air toward the arcuate air bleed passages (64).

Internal combustion engine with oil pump gear surrounding and driven by crankshaft

Abstract: An internal combustion engine having a rotating crankshaft mounted on at least one main bearing is provided with an oil pump having at least one gear surround the crankshaft and rotationally driven by the crankshaft. The pump gear surrounds the main bearing so that the main bearing and the oil pump occupy a common axial space on the crankshaft.

Powershift transmission with direct drive and modulated torque converter drive in forward and reverse

Abstract: A three speed powershift gear transmission includes a torque converter mounted on the input shaft and driven by a fluid actuated modulating clutch to provide fine speed control in two output speed ranges, direct drive in a higher speed range and a reversing drive provided by a duplex planetary gear set. A single countershaft mounts the driven gears of the three speed ranges. The first or lowest speed driven gear is mounted on an overrunning clutch and the second driven gear is connectable to the countershaft by a fluid actuated clutch. The direct drive or third gear is fixed to the countershaft and is drivingly engaged to the input shaft through a fluid actuated clutch. The duplex planetary gear includes a friction clutch responsive to axial gear reaction forces to lock the ring gear to the planet gear carrier in forward drive and a fluid actuated brake for arresting rotation of the ring gear to provide reverse rotation of the planet gear carrier and the transmission output shaft.

Wind driven electricity generator - has hydraulic pumps driven by wind wheel, in turn driving hydraulic motor driven generators selectively connected according to wind speed

Abstract: A wind driven generator having e.g. a 60 ft. dia. wind wheel and generating up to 30 KW, drives four hydraulic gear pumps through step up gearing. A transducer ensures that only one pump is on torque at low speeds, but further pumps are on torque at higher speeds. The pumps one fed from a header tank, and the hydraulic fluid then passes to a piston and cylinder device loaded with a ballast weight. When pressure rises due to increased wheel speed, the piston operate valves are limit switches and a 5KW hydraulic motor is operated to drive an induction generator. For higher wind speeds, the piston rises further and a second hydraulic motor is operated to drive a generator connected to a resistive load for heating. All these devices are operated intermittently as the wind speed varies. At very high speeds, spoilers or flaps on the blades of the wheel can be operated, reducing the efficiency. The first generator can be used to return power to the local mains. The second generator can have a capacity of between 25 and 30 KW.

Gerotor liquid pump mounted on a support bushing

Abstract: A liquid pump, in particular for liquids having a low viscosity, for example, water, alcohols or other chemical liquids is provided of the type which includes a gear unit or a gerotor mounted in a housing which has an inner gear driven by a shaft. The inner gear of the gear unit is mounted on a bushing, the width of which is determined by the required hydrostatic support forces in such a manner that the support faces lie directly in the plane of the hydraulic radial forces.

Two-speed electric hand drill - has second speed shiftable gear with end-face holes for coupling pins of drive gear

Abstract: The simplified two-speed gearing for an electric hand drill which comprises a smaller number of components subject to wear and provides a trouble-free speed changing has the gear (4) of the second speed with a shiftable gear (16) The first speed stage features a gear (6) meshing the drive pinion (35) of the jack shaft (23) which carries the fixed gear (22) meshing the pinion (24) of the motor shaft (25) The shiftable gear (16) exhibits bores (15) on the drive side for the coupling bolts (26) of the gear (22), the front end of the bolts being spherical The springs (28) controlling the coupling bolts ensure that speed changing on load takes place with maintenance of synchronisation between the jack shaft (23) and the shiftable gear (16)

Gear pumps and motors

Abstract: The disclosure relates to improvements in pumps and motors of the gear type. The gear elements are arranged within the pump or motor housing so that the ends or the tips of the teeth are spaced out of fluid sealing relationship and not pressed into the surrounding chamber wall on the low pressure side of the housing. According to the disclosure, sealing members of limited circumferential extent are provided in the housing at the high pressure side of the gears for the purpose of providing a fluid seal between the tips of the teeth in a limited region adjacent the opening in the housing which is at higher pressure. The sealing members disclosed are a pair of separate shoes located adjacent the high pressure opening. The sole support for the shoes is provided by the side pressure plates.

Intermeshing gear pump with sealing means comprising two concentric slide rings

Abstract: A gear pump having a housing and a pump space or chamber within which there are arranged two intermeshing, fluid-conveying gears, each gear being arranged upon an associated shaft. Each shaft is provided at least at the one side of the related gear with a shaft bearing and between such shaft bearing and the gear a sliding ring packing or seal which bounds the pump space or chamber. The sliding ring packing comprises two concentric sliding rings arranged at least approximately in a common radial plane, there being formed between such sliding rings an intermediate space which can be impinged with a barrier or blocking fluid.

Rotary positive displacement pump, especially gear pump

Abstract: Rotary displacement pump, of which the delivery pressure can be adjusted by modifying the losses in the gap between the lateral flank or flanks of one or more of the gear wheels and the house in which these gear wheels are enclosed, at the place of this gap also the mouth of a channel being present, which channel is or can be connected to a return line.

Contaminant resistant gear pumps and motors with wear inserts

Abstract: Hydraulic equipment useful as a pump or motor intended for applications where hydraulic fluid is exposed to contamination by abrasive particulate material is disclosed. Leakage paths from the high pressure chamber in a gear pump or motor are provided with inserts of an abrasion and erosion resistant material at points where wear from abrasives in the hydraulic fluid is aggravated. In particular, the bearing surfaces of the pressure loaded side plates are provided with an insert of abrasion and erosion resistant material in the mesh region of the teeth. Erosion and abrasion resistant rings are located on the side plates in the region surrounding the openings for the shafts and extending interiorly of the tooth root circle to the journal bearings. Also disclosed are radial sealing shoes which are supported by the side plates and are radially urged into sealing relationship with the tips of the teeth by the pressure existing at the high pressure side of the gears.

Internal gear pump motor

Abstract: PURPOSE:To facilitate production by slidably contacting both inner and outer pieces always with the tip of a gear in oil-tight through an elastic pipe interposed between inner and outer pieces which form a filler piece CONSTITUTION:A sickle-formed filler piece is arranged between a pinion 3 and an internal gear 4 which are engaged with and built-in rotatably in housings 1 and 2 The filler piece is formed of a pinion 3 tip sealing inner piece 5, a gear 4 tip sealing outer piece 6 and a plurality of pipe elements 9-11 having a high elasticity and nearly equal width and length of the pinion 3 and interposed between the inner and outer pieces The oil pressure force is supported by the parts 9-11 through an low- pressure side stopper pin 7 The pin 7 also supports the oil pressure which acts to both pieces 5 and 6 and the part 9 in the generation of pump pressure The constitution described above allows both pieces 5 and 6 to contact with the tips of both gears 3 and 4 in oil-tight, so the wear of the tips can be compensated, and precise tolerance of production is not necessary

Gear pump with improved shaft seal

Abstract: A gear pump for pumping hydraulic fluid includes housing, a pair of gears mounted for rotation within the housing, and a drive shaft affixed to one of the gears for transmitting a rotational input force to that gear. The drive shaft includes a portion extending outwardly beyond the housing. A bushing is provided surrounding the drive shaft and secured to the housing so that the drive shaft is free to rotate within the bushing. The bushing is positioned along the drive shaft between the driven gear and the portion of the drive shaft that extends beyond the housing. The bushing includes an end surface facing the driven gear and an annular recess in the end surface adjacent the drive shaft. A dynamic sealing member is positioned within the annular recess for minimizing the amount of leakage of the pumped fluid along the drive shaft.

Pump and engine assembly

Abstract: A pump and engine assembly according to the present invention is adapted for skid mounting and incorporates a pair of engines positioned in side to side relationship and having rotary output shafts thereof positioned in substantially parallel relation. A pair of piston type pumps are also positioned in side by side relationship with the fluid ends thereof facing in the same direction and with pump drive shafts arranged in substantially parallel relation with the rotary output shafts of the engines. The pump housing of a first one of the pumps incorporates a pair of shaft receptacles receiving a pair of rotary drive shafts. One of the drive shafts is provided with a pinion gear having meshing gear engagement with the primary gear of the first pump while the second drive shaft extends from opposed sides of the first pump. The second pump is provided with a drive shaft that is adapted to be coupled to the second drive shaft of the first pump. Both drive shafts of the first pump are coupled to respective ones of the output shafts of the engines.

Energy-efficient fluid medium pumping system

Abstract: The inventive pumping system includes at least two parallel-working pumps or compressors, at least one of which is operable as either a pump or a turbine in one or both directions, its drive motor being also capable of operating as a generator so as to feed electrical power back into the electrical network to which it is connected when necessary. At high fluid flows all the pumps or turbines act as pumps to cause the fluid medium to flow in one direction, whereas as low fluid flows the normal-acting pump or compressor operates at a relatively high energy-efficient speed while the excess flowing fluid medium is caused to flow in a return fashion through the outer pumps or turbines such that they act as turbines and thus generate electrical energy for feeding back to the electrical network to which it is connected.

Mechanical transmission having reduced friction direct drive

Abstract: A mechanical transmission having reduced friction direct drive. An input shaft from a flywheel is drivingly connected to a clutch cover and a tubular shaft. The tubular shaft is connected to a sun gear which engages a pair of planetary gears. The planetary gears are connected to an output drive shaft mounted within and coaxial with the flywheel driven tubular shaft by means of a pair of support arms. The other end of the output shaft is connected to a clutch plate mounted adjacent to the flywheel within the clutch housing. A ring gear, mounted within a gear cover, engages the planetary gears. The gear housing is mounted for rotation around both the tubular and output drive shafts. A band brake surrounds the outside of the gear housing. In reduced ratio drive the clutch is disengaged from the flywheel and the band is clamped to the gear housing so that the ring gear is fixed. The output shaft is driven by the planetary gears, which in turn are driven by the rotation of the sun gear connected through the tubular shaft to the flywheel, causing a reduced ratio output. In direct drive or high gear, the clutch is engaged causing rotation of the output shaft with the flywheel, and the band brake is released allowing the ring gear and gear housing to rotate freely at the same speed as the sun and planetary gears. The output drive shaft is thus directly driven by the flywheel while the gear housing and associated gears rotate freely at the output shaft speed resulting in reduced friction in the gear train.

Bearing lubrication system for gear pump having clearance between bearing and housing wall for preventing entry of contaminants larger than lubrication passage

Abstract: A gear pump suitable for pumping contaminated fuel has a lubrication passage in a pump bearing which receives fuel from the clearance volume between the bearing and the housing in the pump discharge arc. The clearance entrance between the bearing and the housing, which functions as a filter, is smaller than the passage so that contaminants traversing the clearance will not obstruct the passage. Since only contaminants smaller than the clearance entrance can enter the passage, the passage may be made sufficiently small so as not to adversely affect pump performance.

Seal mechanism in gear pumps or motors

Abstract: A seal mechanism in gear pumps or motors, in which a pair of gears engage, so that at least one side surface of these gears is sealed by a pressure plate movable in the direction of the shaft, the said pressure plate is partitioned by a seal member in the shape of a figure "3" at the back into the low pressure zone and the high pressure zone which lead to the inlet side pressure and the outlet side pressure, respectively, both ends of the said seal member are formed in a loop-like shape, and block members for backup use, movable with respect to the pressure plate, are housed in the loop-like parts, so that the said block members may be pressed toward the low pressure side through the seal member by the liquid pressure which is connected to the high pressure zone during the operation of the gear pump or motor, so that these block members may press the end parts of the seal member to the inner wall surface of the gear bower in the housing and so that no liquid may leak from these parts.

Gear machine operable as pump or motor with axially spaced and circumferentially offset pair of gears

Abstract: A gear pump or a hydraulic gear motor has two pairs of meshing external gears, in which the teeth of one of the gears of each pair of gears are circumferentially displaced with respect to the teeth on the other gear of the pair. The gears arranged on the drive shaft are connected by the latter by an internal gearing, especially by splines, whereby the number of the teeth of the internal gearing is an even multiple, especially twice, the number of the external teeth of these gears.

Oil pump and cooler for IC engine - which are built integrally on end wall of cylinder block

Abstract: The oil pump (8) has a gear wheel (8a) driven directly by the engine crankshaft (5). It meshes with an internally toothed annular wheel (8b) to form a gear pump. The oil is discharged by the pump into a heat exchanger (9) built integrally with it and arranged immediately above it. The exchanger has a plate (16) with ribs (13) which press against the water cooled side (15) of the cylinder to form a labyrinth oil passage (12). Ribs (17) on the other side of the plate are closed by a cover (18) to form a further passage (19) for cooling water.

Fluid pump control system for a tractor

Abstract: A fluid pump control for a tractor having a fluid pump controlled by an operator's handle connected to the pump by force-responsive members which do not transmit the pump vibration to the handle. The control is for a tractor transmission driven through a variable displacement pump which inherently develops vibrations. The handle is a pivotally mounted lever and the connections between the handle and the pump are four cables, and two intervening compression springs, all for transmitting the force on the lever to the pump while avoiding transmitting the pump vibrations back to the lever. The springs also are arranged with the cables to automatically return the pump to a neutral position when the operator releases hand force on the lever.