Abstract: A hydraulic pump assembly includes a pump housing having a chamber defined therein, wherein the chamber includes a pair of cylindrically shaped portions each defining at least one end wall. The hydraulic pump assembly also includes a pair of rotary pump elements disposed for rotation within the cylindrically shaped portions of the chamber, and which cooperate to create a hydraulic pressure. The hydraulic pump assembly further includes a pair of cylindrically shaped shafts each having at least one end wall, and disposed within the pair of cylindrically shaped portions of the chamber and within the pair of pump elements. The shafts are fixed for rotation and are axially shiftable with respect to the pump elements. A hydraulic fluid within the chamber stabilizes at least one of the axially shiftable shafts such that the end face of the shaft is spaced from the end wall of the cylindrically shaped portion of the chamber when the hydraulic pump is in use.

Abstract: A gear pump having a housing with an inlet and an outlet. First and second gears are provided with meshing gear teeth. The gears are ceramic rotor gears which are journaled within the housing. A drive shaft drives the first gear in order to move it relative to the second gear, such as to pump a fluid from the inlet to the outlet of the housing. The housing includes an opening for the passage of the drive shaft and a seal surrounding the opening. The seal includes a first seal part rotating with the first gear, and a second seal part forming part of the housing. The first and second seal parts have facing sealing surfaces, are made of ceramic material and are loaded towards each other by a biasing member parallel to the drive shaft. In this way, a mechanical seal is created between the gear and the housing obviating the need for a seal between the drive shaft and the housing.

Abstract: A feedpump for discharging a string of a viscous medium containing solid particles. The feedpump includes a casing and two gearwheels drivable to execute an oppositely directed rotation and arranged in the casing so as in each case to form and maintain gaps relative to both walls of the casing and to one another. The gaps have a size adapted to the size of the particles in the viscous medium.

Abstract: There is provided a rotary internal combustion engine (20) comprising a plurality of rotors (21) each having a plurality of lobes (22) for intermeshing with lobes of other rotors to form successive combustion chambers. Axial seal elements (60, 61) are provided at the rotor tips and trailing tips of the rotors respectively. Circumferential axial edge seals (59) are also provided to interconnect the axial seals. The seals engage sealing plates (30) on each axial side of an engine housing (29) so as to effect the combustion chambers. Fuel inlets and ignition means are provided at suitable locations, as are exhaust means.

Abstract: A geared feed pump has a rotatably driven pair of meshed gears (16, 19) arranged in a pump chamber (14) of a housing (10, 12). The feed pump supplies fuel from a suction chamber (16) between the peripheries of the gears (16, 18) and the peripheral walls (15) of supply channels (30) formed in the pump chamber into a pressure chamber (28). One of the gears (16) has a hole (32) and is secured onto the drive shaft (22), which is rotatably positioned in the housing (10). At least one radially, resilient connecting element (40) is arranged on the drive shaft (22), and the connecting element is pressed into the hole (32) of the gear (16). The connecting element (40) makes possible the rotationally determined securement of the gear (16) onto the drive shaft (22) and forms an overload-protection device. The connecting element (40) also makes possible, through its radial resiliency, a tolerance equalization between the drive shaft (22) and the gear (16) in a radial direction.

Abstract: A rotary lobe pump includes two geared-together, counter-rotating shafts, to which are affixed rotors with interdigital lobes. Adjustment of the angular relationship of the rotors uses a clamping device within each rotor. The clamping device consists of a tapered, slotted bushing that is forced between a mating taper on the rotor and a locking device on the shaft by means of a flanged fastener mated to each pump shaft's threads.

Abstract: A multi-lobe, or Roots, blower has two multi-lobe rotors connected for rotation to two drive gears one of which drive gears is connected for rotation to a motor by a quill drive spanning one of the rotors. In sequence, the multi-lobe rotors are preferably within a first chamber of a monolithic housing, the drive gears within a second chamber, and the motor outside the housing. In the quill drive a central shaft is affixed at one end to a shaft of the motor, and at its other end to a hollow tubular shaft containing the central shaft. The tubular shaft affixes at its exterior both one of the two drive gears and one of the two multi-lobe rotors. The quill drive thus transmits torque from the shaft of the motor along the central shaft completely through the first chamber and a multi-lobe rotor therein until, ultimately affixing the tubular shaft and the drive gear within the second chamber, the drive gears and the rotors are caused to be rotated.

Abstract: A pump body for a medical gear pump for sucking and irrigating has a pot-like pump housing with two cylindrical openings, in which two meshing gearwheels are embedded. The driving gearwheel is, without pivot bearing, embedded in the opening. A lid is used for closing the pot-like pump housing. A trunnion protrudes from a bottom of the pump housing, onto which trunnion the driven gearwheel is mounted.

Abstract: The invention relates to a device for delivering fuel from a tank to an internal combustion engine, wherein a pump chamber is embodied in the housing of the feed device. Rotary driven displacing elements are contained in the housing. The shaft supporting a displacing element is provided with bores which connect an end of the shaft to the suction side of the feed device.

Abstract: A device for supplying liquids, particularly fuel, has a first drive shaft (32) and a supply pump (30) having at least one supply member (40) coupled to a second drive shaft (36), whereby the first drive shaft (32) drives the second drive shaft (36) via a drive unit (60). The drive unit (60) is preferably a tapered ring drive, which has a first frictional bevel gear (62) connected to the first drive shaft (32) and a second frictional bevel gear (64) connected to the second drive shaft (36), whereby the first and second friction bevel gears (62, 64) roll off one another by a tapered ring (66) disposed between the two bevel gears. The tapered ring (66) is movable for changing the gear ratio of the gear unit (60) as a function of the supply pressure produced by the supply pump (30). In this manner, with a lower supply pressure, a large gear ratio of the gear unit (60) is determined, and with an increased supply pressure, a smaller gear ratio of the gear unit (60) is determined.

Abstract: In accordance with the invention, the vacuum pump cooling system includes tubes expanded along their entire length in bores through the vacuum pump body. The tubes can be made of stainless steel, and inserted into a vacuum pump body made of cast iron. This prevents the risk of corrosion of the vacuum pump body by a cooling liquid passing through the tubes to cool the vacuum pump body.

Abstract: The invention relates to the design of backflow orifices for a rotary compressor serving as a compressor for an engine. One example of such a rotary compressor is a roots blower. The fluid conveyed by two oppositely rotating rotors from an inlet to an outlet of the compressor flows back partially via the backflow orifices. The edges of the backflow orifices are at a varying height from an inner surface contour of the pump casing. The height variation contributes to a reduction in the noise generated by the compressor.

Abstract: The invention relates to a method for transporting sewage in a vacuum system, which comprises a source (2) of sewage, which through sewer piping (1) is connected to a collecting or discharge space (15) for sewage, and means (4,5) for generating vacuum in the sewer piping (1). In order to attain a reliably operating system the method employs a rotary lobe pump (4,5) for generating vacuum, transported through the rotary lobe pump (4,5) to the collecting or discharge space (15) for sewage. The rotary lobe pump can also be used for emptying the collecting space.

Abstract: The problem of aligning the drive shaft of a pressure clamped pump with the output shaft of a drive motor in a hydraulic apparatus is solved through the use of pressure clamped pump having a housing adapted for installation into a cavity and a drive shaft coincident with the center of the housing. The hydraulic apparatus may include piloting features configured to facilitate alignment of the pump drive shaft with the output shaft of a motor used to drive the pump. The pump may include elements for retaining the drive shaft within the pump, and may also include a larger and less restricted inlet than could be achieved in prior pressure clamped pumps. The pump may include pumping means in the form of a gear pump having a single primary gear driving a single secondary gear. The pumping means may alternatively be a gear pump having a single primary gear driving two or more secondary gears.

Abstract: A method for the metered discharge of a string of a viscous medium, in particular of an abrasive medium containing solid particles, via a nozzle, in which the quantity of the medium is discharged as a function of the speed of the nozzle and is increased or reduced as a function of the acceleration or deceleration of the nozzle.

Abstract: A novel bi-rotational pump adapted to pump fluid in either of two directions by reason of construction inclusive of passageways and an array of check valves and pilot pistons which cooperate in one direction and in another way in the other direction.

Abstract: A geared pump, having a housing (18), two gear wheels (14, 16) that are disposed in the housing and mesh with one another, and at least one groove (22) that is embodied in the housing on the pressure side of the geared pump, cavitation damage at high rpm is to be avoided. To that end, it is provided that the groove has a first portion (24), which extends from the pressure side, and in which the bottom of the groove (22) has a slight spacing from the tips of the teeth (20) of the gear wheel, and a second portion (26), which adjoins the first portion and in which the bottom of the groove (22) has a maximum spacing from the tooth tips that is greater than the spacing in the first portion, and the first portion extends over a smaller angular range (&agr;) than the second portion, and the groove extends over a total angular range (&agr;, &bgr;) that is somewhat greater than angular spacing between two teeth (20).

Abstract: A device for supplying liquids, particularly fuel, has a first drive shaft (32) and a supply pump (30) having at least one supply member (40) coupled to a second drive shaft (36), whereby the first drive shaft (32) drives the second drive shaft (36) via a drive unit (60). The drive unit (60) is preferably a tapered ring drive, which has a first frictional bevel gear (62) connected to the first drive shaft (32) and a second frictional bevel gear (64) connected to the second drive shaft (36), whereby the first and second friction bevel gears (62, 64) roll off one another by a tapered ring (66) disposed between the two bevel gears. The tapered ring (66) is movable for changing the gear ratio of the gear unit (60) as a function of the supply pressure produced by the supply pump (30). In this manner, with a lower supply pressure, a large gear ratio of the gear unit (60) is determined, and with an increased supply pressure, a smaller gear ratio of the gear unit (60) is determined.

Abstract: The invention relates to a coupling for coupling two rotatable bodies, in particular a gear and a drive shaft, which are disposed essentially concentric to each other, with or without axial offset, having a coupling part. In order to reduce the structural height of the coupling, the coupling part is integrated into one of the rotatable bodies. In a fuel-supply pump, the drive shaft is coupled to the driven gear by means of the coupling part.

Abstract: The gear unit for a delivery pump installed in a deep borehole has a toothed gear unit with a pinion located on input shaft (2) and a gear wheel engaged with the pinion, which gear wheel is located on a vertical output shaft (5) driving the delivery pump. The gear unit is designed as a right-angle unit with a conical pinion gear (3) located on the input shaft (2) and a bevel gear (6) located on the output shaft (5). Located on the input shaft (2) is a gearwheel (10) which together with a second gearwheel (11) forms a gear pump which conveys fluid in a direction opposite the operational direction of rotation of the gear unit.

Abstract: A geared feed pump has a rotatably driven pair of meshed gears (16, 19) arranged in a pump chamber (14) of a housing (10, 12). The feed pump supplies fuel from a suction chamber (16) between the peripheries of the gears (16, 18) and the peripheral walls (15) of supply channels (30) formed in the pump chamber into a pressure chamber (28). One of the gears (16) has a hole (32) and is secured onto the drive shaft (22), which is rotatably positioned in the housing (10). At least one radially, resilient connecting element (40) is arranged on the drive shaft (22), and the connecting element is pressed into the hole (32) of the gear (16). The connecting element (40) makes possible the rotationally determined securement of the gear (16) onto the drive shaft (22) and forms an overload-protection device. The connecting element (40) also makes possible, through its radial resiliency, a tolerance equalization between the drive shaft (22) and the gear (16) in a radial direction.

Abstract: A modular downhole pump includes a gear module for transferring power to the pump from a sucker rod or a downhole motor and a rotor module. The rotor module includes a pair of counter-rotating, interleaved rotors split into an upper pair and a lower pair which pump fluids in opposite directions within the rotor module. The rotor modules may be configured to increase the pressure capacity or the volume capacity of the pump and may be connected in series to achieve the desired volume and pressure output.

Abstract: In order to achieve high rotational speeds for a drive motor used for surgical purposes without the need for excessive maintenance of this motor, it is proposed that it be in the form of a compressed-fluid-driven, gear-type motor having interengaging gears which are sealed in a housing and have a rotational speed of between 40,000 and 150,000 revolutions per minute.

Abstract: An outboard motor is provided with an engine having a screw compressor which provides a pressurized charge for the combustion chambers of the engine. The screw compression has first and second screw rotors arranged to rotate about vertical axes which are parallel to the axes of a crankshaft of the engine. A bypass valve regulates the flow of air through a bypass conduit extending from an outlet passage of the screw compressor to the inlet passage of the screw compressor. A charge air cooler is used in a preferred embodiment and the bypass conduit then extends between the cold side plenum of the charge air cooler and the inlet of the compressor. The bypass valve is controlled by an engine control module in order to improve power output from the engine at low engine speeds while avoiding any violation of existing limits on the power of the engine at higher engine speeds.

Abstract: The invention provides an axially compact gear pump comprising a housing (13) and end plate (14). Dowels (18) extend from the housing through the end plate to locate the end plate (14) relative to the housing (13), and project from the end plate (14) for locating the assembled gear pump (10) on its drive means in use. Assembly bolts (20) extend through the housing (13) and into the end plate (14) to hold the gear pump together for transportation prior to use, but mounting bolts (22) for mounting the gear pump on the drive means or on a test plate in use pass completely through both the housing (13) and end plate (14), providing enhanced rigidity to the assembly.

Abstract: A pump body for a medical gear pump for sucking and irrigating has a pot-like pump housing with two cylindrical openings, in which two meshing gearwheels are embedded. The driving gearwheel is, without pivot bearing, embedded in the opening. A lid is used for closing the pot-like pump housing. A trunnion protrudes from a bottom of the pump housing, onto which trunnion the driven gearwheel is mounted.

Abstract: A rotary pump has a simple construction by omitting a transmission shaft on the side of a motor and whereby makes a cost of the rotary pump as low as possible, with maintaining feature that assembling and disassembling is facilitated. The rotary pump has a main casing, a casing cover cooperated with the main casing for defining a pumping chamber therebetween, a pair of rotors received within the pumping chamber with mutually meshing pumping segments for synchronous revolution in mutually opposite directions, a space being defined in one portion of the casing cover, a cover piston being disposed within the space for movement back and forth with respect to an end surface of the rotor, and an air cylinder being mounted on the casing cover and having a piston rod, to which the cover piston is connected.

Abstract: A gear pump comprising a plastic gear pump housing having an interior surface. Rotatably attached to the gear pump housing is a drive gear and an idler gear. The idler gear is cooperatively engaged to the drive gear such that rotation of the drive gear will rotate the idler gear. The gear pump housing is formed from plastic such that the interior surface thereof is sized to contact the drive gear and the idler gear. Accordingly, the contact between the idler gear and the drive gear with the interior of the plastic gear pump housing forms a seal therebetween which is used for the pumping of fluid by the gear pump.

Abstract: The hydraulic pump, in particular the hydraulic pump of an electro-pump unit, of a type comprising a pump body enclosing a gear pump and provided with a suction aperture for aspirating a low pressure liquid and an outlet chamber for driving back a high pressure liquid, which communicates with a high pressure outlet channel connected to a user hydraulic circuit, and a hydraulic capacity for dampening of pulses generated by the pump and equipped with deaerating means for a draining of air able to be trapped therein, the deaerating means being formed by the high pressure liquid that is driven by the pump back into the outlet channel.

Abstract: A positive displacement, recirculating Root's type rotary compressor which operates on a constant volume, near isothermal cycle is disclosed. The compressor includes a pair of involutely lobed impellers and a discharge pressure reflux flow loop. The flow loop includes a discharge port, a flow distributor, an output port, and one or two pair of low impedance rectangular conduits terminating in linear nozzles that serve as reflux ports. Reflux flow through the nozzles is directed with impeller rotation. It isentropically expands into the constant volume displacement cavities so that the contained pressure approaches discharge level. The final pressure increase into discharge is gained through adiabatic compression at a low pressure ratio. The resulting process is inherently non-contaminating, as there are no valves and no contacting or rubbing parts in the flow stream. It can be applied wherever gases or vapors must be compressed.

Abstract: The gear unit for a delivery pump installed in a deep borehole has a toothed gear unit with a pinion located on input shaft (2) and a gear wheel engaged with the pinion, which gear wheel is located on a vertical output shaft (5) driving the delivery pump. The gear unit is designed as a right-angle unit with a conical pinion gear (3) located on the input shaft (2) and a bevel gear (6) located on the output shaft (5). Located on the input shaft (2) is a gearwheel (10) which together with a second gearwheel (11) forms a gear pump which conveys fluid in a direction opposite the operational direction of rotation of the gear unit.

Abstract: A gear pump for delivering liquid media has a pump housing with at least two bores, in which at least two meshing gears with tooth tips are contained. The gears are radially mounted by bearing surfaces which on one side consist of areas of the tooth tips and on the other side, of areas of the interior of the bores. This arrangement requires no slide bearings in the conventional sense, which results in a smaller number of pump parts and hence to reduced manufacturing costs.

Abstract: The required larger than normal pressure drop between the infeed and pump inlets of a positive displacement gear or lobe type pump pumping a high viscosity fluid such as pastry dough is obtained by the introduction of a vacuum inside the pump at or near the rotary nip points of the gear or lobe type pump to provide a means for the removal of any gas present in the vicinity of the nip point.

Abstract: A hydraulic pump includes a pump mechanism having a driven shaft. The driven shaft is connected to an input shaft by a flexible coupling such as a splined connection. A housing extends completely around the driven shaft, and a high-pressure seal is disposed between the housing and the input shaft. A thrust bearing carries hydraulic axial forces on the input shaft to the housing. This arrangement provides balanced hydraulic forces on both ends of the driven shaft, thereby reducing friction and wear.

Abstract: The present invention provides a pump drive assembly for a deep well, submersible, progressing cavity pump that includes an internal hydraulic pump for slowing the counter rotation of the polished rod induced by recoil in the sucker rod. The pump drive assembly includes a housing enclosing a hydraulic fluid reservoir and a gear chamber separate from the reservoir. A drive shaft extends into the housing and includes a drive gear integral with or keyed to the drive shaft. A main shaft also extends into the housing and includes a main gear integral with or keyed to the main shaft. The main gear is engaged with the drive gear within the gear chamber, where the gear chamber includes an inlet and an outlet channel providing fluid communication between the gear chamber and the reservoir, so that the gears form a reversible gear pump within the housing. The reversible gear pump operates to pump hydraulic fluid from the reservoir into the gear chamber and back into the reservoir.

Abstract: There is disclosed a hydraulic or pneumatic machine having a first displacement element (8) that is rotatable about an axis of rotation connected to a shaft (10) so as to rotate therewith, which shaft is mounted rotatably in a housing (2), and co-operates with a second displacement element (9). The structure of such a machine is to be improved. For that purpose, the housing (2) has a pocket (3) in which the displacement elements (8, 9) are so arranged that the housing (2) covers the displacement elements (8, 9) axially on both sides (4, 5) at least in a working region and in the circumferential direction over a maximum of 180°.

Abstract: Rotary pump apparatus includes a pump housing having a drive gear and a driven gear positioned in the interior of the housing. A fluid-flow passageway provides fluid to a volumetrically changing space located between meshing gear teeth to prevent the pressure in the space from dropping below the vapor pressure of the fluid.

Abstract: A pressure difference adjusting device is provided for a valve having a first inlet for a first fluid of a first pressure, a second inlet for a second fluid of a second pressure not equal to the first pressure, and an outlet. The pressure difference adjusting device includes two rotatable elements that are mounted in a meeting area of the incoming fluids. The elements mesh with each other to drive each other when the elements are subjected to impact from the incoming fluids.

Abstract: The high efficiency gear pump includes a pump housing which defines an internal pump chamber. The pump chamber includes opposed first and second elongate gear receiving sections spaced on opposite sides of a central chamber section. The first and second gear receiving sections each have an arcuate peripheral wall which extends between a low pressure inlet port and a high pressure outlet port positioned on opposite sides of the central chamber section between the first and second gear receiving sections. Coaxially mounted on a drive shaft for rotation therewith are first and second pump drive gears having teeth which rotate in minimal spaced relationship with the arcuate peripheral wall of the first gear receiving section. The first and second pump drive gears are mounted for floating axial movement relative to each other and the drive shaft.

Abstract: A fluid machine comprises a rotor (7, 9) meshed with each other in concave and convex portions (23, 26) and (25, 24), and a casing (3) enveloping these elements within cylindrical portions (43, 45) of a rotor chamber (5) and having a flow inlet port (31) and a flow outlet port (33). The cylindrical portions (43, 45) are moved to moved centers (47, 49) from standard centers (35, 37) at a predetermined distance L toward the flow inlet port (31), so that the rotor chambers (5) is expanded to cylindrical portions (55, 57) from the cylindrical portions (43, 45).

Abstract: A fluid flow device and method are provided according to which one or more impellers are mounted for rotation in a chamber formed in a casing. Fluid to be processed is introduced into an inlet formed in the casing and at least one impeller is mounted for rotation in the chamber to flow the fluid through the casing and through an outlet in the casing. The impeller also draws atmospheric air into the chamber through an air inlet formed in the casing, and any backflow of the fluid from the fluid outlet into the air inlet is prevented.

Abstract: A rear end gear pump for providing lubricant/coolant to a rear axle assembly of a racing vehicle that is removably securable to the interior of a rear axle housing. The rear end gear pump is preferably coupled to a pinion shaft of the rear axle assembly and provides lubricants/coolants to the entire rear axle assembly. The pump includes a substantially hollow pump casing for removable attachment to the interior of the rear axle housing, a pair of pump gears housed within the interior of the pump casing, an input port formed through the hollow casing for receiving lubricant/coolant into the pump, means for conducting lubricant/coolant into the pump connected to the input port, a bearing lubrication port formed through the pump casing to provide lubrication to the pinion bearing and an output port formed through the hollow casing for conducting lubricant/coolant away from the pump. One of the pair of pump gears is attachable to the pinion shaft of the rear axle assembly.

Abstract: A displacement pump for a relatively high pressure performance environment includes a casing with first and second ends, with rotors driven in the casing to effect pumping. Flushing fluid (such as sealing water or substantially fiber-free foam) is introduced into a clearance between the rotors and the interior surface of the second end of the casing to keep the clearance substantially free of undesirable particles or fibers, typically fibers (such as glass fibers) having greater abrasiveness than cellulose fibers, or fibers (such as synthetic fibers, or synthetic material coating cellulose fibers) having poorer heat resistance than cellulose fibers. The flushing fluid may be introduced into the clearance in a number of different ways as long the clearance is kept substantially free of the undesirable particles or fibers. The flushing fluid is introduced, preferably through a check valve, at a pressure at least slightly higher than the output pressure of the pump.