Abstract: A pump includes a housing having a first end and a second end and extending along a longitudinal axis and a discharge casing having a first end coupleable to the second end of the housing. The discharge casing extends along the longitudinal axis coaxial to the housing. A dismounting device includes a first dismount casing and a second dismount casing disposed between the discharge casing and the second end of the housing. The dismounting device extends along the longitudinal axis coaxial to the housing and the discharge casing.

Abstract: An eccentric screw pump has a stator, a rotor in the stator, a drive for the rotor, and a pump housing between the stator and the drive and having an opening between for receiving the medium being pumped. A releasable drive-end coupling connects a connecting shaft of the drive to a coupling rod, and a rotor-end releasably connects the coupling rod to the rotor at a separation point. A rotor stub connects the rotor to the rotor-end coupling and is separable from the rotor at the separation point. A drive-end housing collar secures the pump housing to the drive. A rotor-end housing collar has a fixed first element fixed relative to the pump housing and an axially displaceable second element that is releasably fixable to the stator and that can be pushed axially toward the housing opening of the pump housing onto the first element to expose the separation point.

Abstract: A compressor or vacuum pump including: —a casing having a cooling gas inlet and a cooling gas outlet for allowing a cooling gas to flow therethrough; —a fan mounted at the cooling gas inlet, including a fan housing and configured to blow said cooling gas into said casing; —a compression or vacuum chamber including a first housing, a process gas inlet and outlet for allowing a process gas to flow therethrough and at least one rotating element; —a driving module including a second housing and at least one bearing for supporting said at least one rotating element; —a silencer including a cover and configured to attenuate noise generated by the compressor or vacuum pump. The silencer includes a recess structure on its cover, configured to deflect the cooling gas flow from the fan towards the driving module.

Abstract: In a production apparatus for pumping production fluid to the surface of a well, a progressive cavity pump with a stator and a rotor in which the rotor has an extension which rests on a thrust bearing, lubricated by production fluid.

Abstract: The invention relates to a vacuum pump, in particular a screw pump, having preferably two displacement body shafts (2, 3), coupled via a gearing, which drive displacement bodies (12, 13), and having an inner recess (14), extending in the direction of a geometric axis (A) of the displacement body shaft (2, 3), in which a tubular body (20) extends for conducting cooling fluid while leaving a free space between an inner surface of the recess (14) and an outer surface of the body (20).

Abstract: Hydraulic pump applications sometimes require the pump to be able to provide relatively low pressure with larger amounts of fluid moved, while other applications call for relatively higher pressures but less fluid moved. The multi-speed hydraulic pump can operate at multiple speeds so as to provide multiple outputs of pressure and flow. In a two-mode version, the pump has one mode of operation that provides for lower pressure/more fluid moved and another mode of operation that provides for higher pressure/less fluid moved. Having multiple modes of operation in the pump allows for a single pump to provide greater movement or greater pressure while working within the limits of the force or speed at which the pump is actuated.

Abstract: In at least some implementations, a fluid pump includes a drive shaft including at least one drive surface and a pumping element. The pumping element includes an opening in which a portion of the drive shaft is received so that the pumping element is driven for rotation by the drive shaft, and the opening is larger than the drive shaft to provide a clearance between the pumping element and at least part of the drive shaft. The pumping element also includes at least one engagement surface arranged to be engaged by the drive surface of the drive shaft when the drive shaft is rotated where one or both of the drive surface and the engagement surface are angled to provide a surface area of engagement between the drive surface and engagement surface that is at least 1% of the surface area of the drive surface.

Abstract: A helical gear pump includes a second helical gear provided coaxially with a drive helical gear, a third helical gear engaged with the second helical gear and provided on a third shaft different from a shaft of the drive helical gear and a shaft of a driven helical gear, and a bearing for supporting the third shaft and receiving a thrust force.

Abstract: A piston assembly is disclosed. In one aspect, the piston assembly includes a rotary piston, wherein the rotary piston comprises a first axis of rotation, a central bore having bore axis and at least two curved first constraint surfaces, and wherein the bore axis substantially corresponds to the first axis of rotation. The piston assembly also includes a substantially hollow-cylindrical bearing ring configured to be at least partially inserted in the central bore. The piston assembly further includes at least one fuse body configured to connect the rotary piston and the bearing ring, and to transmit, at least temporarily, a force in the two opposite axial directions relating to the first axis of rotation between the rotary piston and bearing ring.

Abstract: A pump gear is provided. The pump gear includes a first shaft portion having a first end and a second end with an integral gear portion formed therebetween. The first shaft portion is made from a first tool steel material. A second shaft portion having a third end brazed to the first end. The second shaft portion has at least one integral drive spline formed adjacent one end. The second shaft portion is made from a second tool material. The first tool steel material has a vanadium content by weight of greater than 9% and the second tool steel material has a vanadium content by weight of less than or equal to 1%.

Abstract: Provided is a scroll type compressor which reduces variations in the pressing load of a rotating scroll on a fixed scroll, reduces the impact at the start of the compressor and suppresses noises, and can provide excellent durability. A peripheral elastic body 51 and a bottom-portion elastic body 52, which is brought into a compressed condition in the axis line direction of the main shaft 31, are interposed between a stopper pin 41 on the rotating scroll side and a concave portion 42 on the main shaft 31 side, whereby working errors of each part are compensated and the rotating scroll is constantly brought into close contact with the fixed scroll to maintain the sealing of the compression chamber.

Abstract: A rotor drive mechanism 25 is configured to transfer rotation of a driving shaft 38 to an external screw type rotor 22 of a uniaxial eccentric screw pump 23 via a connecting shaft 39, the driving shaft 38 being rotated such that the center thereof is located at a fixed position. The rotor drive mechanism 25 is configured such that: the driving shaft 38 includes an inner space 46 which is open toward the rotor 22; the connecting shaft 39 is inserted in the inner space 46; and a first seal portion 55 seals between an inner peripheral surface of an opening of the driving shaft 38, the opening being open toward the rotor 22, and an outer peripheral surface of the rotor shaft 37 connected to the rotor 22 configured to carry out an eccentric rotational movement.

Abstract: A progressive cavity pump includes at least one inner rotor with Z external threads and at least one outer rotor with Z+1 internal threads. The outer rotor has radial bearings at both ends, whereas the inner rotor has a radial bearing only on one side, preferably the inlet side. There is arranged, on the same side as the bearing of the inner rotor, a conventional gear, for example a wheel gear, for maintaining a stable ratio between the rotational speeds of the inner and outer rotors exactly equal to (Z+1)/Z.

Abstract: A “cat and mouse” rotary engine/pump comprising two inclined power shafts at the two ends of the rotor-pistons. Each power shaft connects to both rotor-pistons by concentric crosses. Either piston can be suspended from the bearings of the inclined shafts indirectly, through the inclined shafts and the crosses, avoiding any touching with the other piston and the casing. The arrangement improves the balance of the engine, rids the bearings of the rotor-pistons from heavy idle loads, allows lighter and more robust structure. The power is shared between the two counter-rotating shafts. The arrangement fits to divided load applications, like portable flyers, REM.

Abstract: A pump apparatus includes a first rotor drive mechanism configured to transfer rotation of an input shaft portion to an output shaft portion coupled to an external screw type rotor of a uniaxial eccentric screw pump, the input shaft portion being rotated with a central axis thereof kept in a certain position, and a uniaxial eccentric screw pump. The output shaft portion is rotatably provided via a bearing at a position eccentrically located with respect to the input shaft portion. The rotation of the input shaft portion is transferred through a first power transmission mechanism, including an inner gear, to the output shaft portion to cause the output shaft portion to carry out an eccentric rotational movement. The input shaft portion and the output shaft portion are arranged inside a pitch circle of the inner gear.

Abstract: A bearing material composition that lines a support includes a combination of a thermoplastic conforming material and abrasive particles which provide a combined effect for remedying the effects due to edge loading that may be caused by misalignment between the bearing and a shaft to which a portion is rotatably mounted. The conforming material may be PTFE such that it does not have a memory and is subject to cold flow and creep. As a result, misalignment problems and edge loading are remedied by the combination of abrasive removal of metal material from the drive shaft at the location of edge loading and creep of the conforming material at the location of edge loading which may provide an overall greater bearing interface surface.

Abstract: A vane pump comprising a case, a rotor disposed in the case, the rotor having a bore, a plurality of vanes radially moveable with respect to the rotor extend from the rotor, a drive shaft engaged with the bore, a second shaft fixedly connected to the case and extending from the case to slidingly engage the bore, a land extending from each end of the rotor, each land cooperating with the case to seal a fluid flow, and each land further axially controlling a rotor position within the case by a sliding engagement, and the drive shaft retainable in a predetermined position with respect to the case.

Abstract: A lube pump is provided for supplying lubricant to various components of a power transmission unit of the type used in motor vehicles. The lube pump includes a pump assembly and a coupling mechanism for releaseably coupling the pump assembly to a driven shaft. The coupling is operable to release the pump assembly when the rotary speed of the shaft exceeds a threshold value.

Abstract: A progressing cavity pump assembly includes a collar assembly connecting a housing and a tubing string, with the collar having an inside diameter upset and the rotor having a rotor head axially spaced from a rotor helix, with the rotor head having an outer diameter forming a stop adapted to land on the inside diameter upset. A method of timing a progressing cavity pump assembly includes providing a collar assembly having an inside diameter upset, movably connecting the collar assembly and the housing, providing a rotor having a rotor head axially spaced from a rotor helix, with the rotor head having an outer diameter forming a stop, selectively adjusting the relative position of the collar assembly and the housing to form a pathway substantially corresponding to the rotor helix, landing the stop on the inside diameter upset, and fixing the relative position of the collar assembly and the housing.

Abstract: A coupling mechanism for a scroll compressor comprises an orbiting scroll disk, a retention bolt, a bearing shaft and a retention nut. The orbiting scroll disk includes a first face configured to engage a stationary scroll disk to compress a working fluid, and a second face having a hub. The retention bolt is inserted into the hub. The bearing shaft is fit onto the retention bolt and includes a bearing surface for engaging a drive bushing of a drive shaft. The retention nut is threaded onto the retention bolt to retain connection of the bearing shaft with the orbiting scroll disk.

Abstract: A fuel pump (10) supplying fuel to an internal combustion engine includes an electric motor (14), a shaft (16) driven by the motor, and a pump assembly (18) including a pumping element (20) mounted on the shaft. A fuel pump improvement includes the shaft being a multi-sided shaft with the pumping element having a central opening (22) through which the shaft extends. This opening is a contoured opening having a plurality of sides each of which is in contact with a side (22a-22c) of the shaft to distribute wear which occurs between the shaft and the pumping element. This construction prolongs the operating life of the pump. In a roller vane type pump having N vanes, the motor shaft has a number of sides S determined by the formula S=N±1, and N>3.

Abstract: A pump, in particular a sliding-vane pump, a roller cell pump, or a gear pump includes a rotating assembly, with, amongst other things, a rotor with radially-sliding vanes, rollers or gears and a drive shaft is provided. The rotor or a gearwheel is connected to the drive shaft by a toothing on the drive shaft and on the rotor or gearwheel for rotational drive.

Abstract: A compressor drive shaft may include a first bearing portion, a second bearing portion, and an intermediate portion disposed therebetween. The intermediate portion may include a continuous, nonlinear, central axis in an unloaded state.

Abstract: Oil supply grooves (74, 84) are formed respectively in a rotating shaft (70) of a compression mechanism (50) integral with an electric motor (40) and in a rotating shaft (80) of an expansion mechanism (60). The rotating shafts (70, 80) are coupled together by engagement between an engagement convex portion (85) and an engagement concave portion (75) which are formed respectively in shaft ends of the rotating shafts (70, 80). And, a seal groove (S) is formed in the peripheral surface of the engagement convex portion (85) and an O-ring (R) is engaged into the seal groove (S). Hereby, lubrication oil leakage from between the engagement convex portion (85) and the engagement concave portion (75) is prevented.

Abstract: The drive connection between an eccentric pin and a slider block in a scroll compressor is angled such that any vertical force between the two will drive the slider block away from the orbiting scroll member. In this manner, manufacturing tolerances will not result in any drive connection which can have a net vertical force driving the slider block toward the orbiting scroll member.

Abstract: Pumping system comprising: a progressive cavity pump comprising a helical rotor inside a helical cavity of an outer stator; motor for driving the rotor, with a motor shaft coaxial to the axis of the stator cavity; and an intermediate shaft coupled, at its ends, by respective couplings, to the rotor shaft and to the motor shaft. Two devices consisting of two of these connected parts are constructed as a male device terminated by an axial stub and a female device terminated by an axial housing receiving the stub, at least two radial screws, not aligned, one of which is a cone-point set screw, connected the stub to the female device.

Abstract: The invention relates to a compact eccentric screw pump including a sliding articulation. The long-lasting operation of the pump is ensured by a plurality of functions. According to the invention, both the reaction pressure resulting from the transport pressure and the concomitant phenomena emerging from the eccentrically rotating rotor and acting on the articulation and the drive are approximately equalized.

Abstract: A lube pump is provided for supplying lubricant to various components of a power transmission unit of the type used in motor vehicles. The lube pump includes a pump assembly and a coupling mechanism for releaseably coupling the pump assembly to a driven shaft. The coupling is operable to release the pump assembly when the rotary speed of the shaft exceeds a threshold value.

Abstract: A shaft-hub connection for transferring a torque between a shaft (1) and a hub (3) with the aid of at least one drive element (2). To enable a torque transfer which is practically resistant to wear, even under the effect of transversal forces, the contact surface between the shaft and the hub and/or between the shaft and the drive element and/or between the hub and the drive element is minimized in the axial direction thereof.

Abstract: An eccentric coupling device in a radial compliance scroll compressor includes a crank pin that is eccentrically arranged at an upper end of a crankshaft and provided with a vertically-extending flat surface at one side thereof. A bush is provided with a crank pin hole, overlapped by a stopper hole, for receiving the crank pin. A stopper is fitted in the stopper hole such that the stopper radially protrudes into the crank pin hole toward the flat surface to selectively come into contact with the flat surface in accordance with a rotation of the bush. An elevating preventing device is adapted to elastically support the bush, while connecting the stopper and the crank pin via a spring wire, preventing an elevation of the bush.

Abstract: An eccentric coupling device in a radial compliance scroll compressor including a crank pin eccentrically arranged at an upper end of a crankshaft included in the scroll compressor, and provided with a vertically-extending cut surface at one side thereof, a bush fitted around the crank pin, and provided with a crank pin hole and a stopper hole, a stopper fitted in the stopper hole, and an engagement jaw adapted to prevent a vertical movement of the stopper, thereby preventing a vertical movement of the bush, the engagement jaw being provided at an upper end of the crank pin. The bush is arranged such that an upper end thereof is flush with an upper end of the crank pin. The stopper hole overlaps with the crank pin hole so that the stopper selectively comes into contact with the cut surface in accordance with a rotation of the crank pin. The stopper has a length shorter than that of the stopper hole.

Abstract: An eccentric bush structure in a radial compliance scroll compressor including an eccentric bush fitted around a crank pin eccentrically provided at an upper end of a crankshaft, crank pin and stopper holes provided at the eccentric bush, and a weight member adapted to increase a weight of the eccentric bush. The stopper hole overlaps with the crank pin hole such that a stopper received in the stopper hole is radially protruded into the crank pin hole toward a vertically-extending cut surface formed at the crank pin to selectively come into contact with the cut surface in accordance with a rotation of the crank pin.

Abstract: An improved high pressure intermeshing gear pump that achieves high efficiency and a low cost by forming the pumping cavity such that no fillets exist at the corners permitting closed fits without utilizing bearing end plates. In addition an improved coupling between the gears and their supporting shafts is disclosed as is a simplified machining method that eliminates burrs that may be formed during the drilling operations.

Abstract: An improved high pressure intermeshing gear pump that achieves high efficiency and a low cost by forming the pumping cavity such that no fillets exist at the corners permitting closed fits without utilizing bearing end plates. In addition an improved coupling between the gears and their supporting shafts is disclosed as is a simplified machining method that eliminates burrs that may be formed during the drilling operations.

Abstract: A pumping device is provided which comprises a Moineau pump with a helical rotor inside a helical cavity of a stator, driver means, and a drive connecting rod coupled by a respective coupling to a driving shaft of the driver and to one end of the rotor. Each coupling comprises a spherical head secured to the connecting rod and housed in a cavity that is cylindrical of revolution with the same diameter as and secured coaxially to the end of the rotor of the driving shaft; and a ball housed partly in a cup of the spherical head with its axis perpendicular to the axis of the connecting rod and partly in a lateral recess of the cavity.

Abstract: The invention relates to a rotary piston machine, comprising a housing (10) and a piston (12) which is situated in a hollow area of the housing (10) in such a way that it can rotate and which is rotationally fixed to a shaft (18) that passes through the housing (10). At least one inlet channel and at least one outlet channel for guiding a working fluid in or out of the hollow area are configured in the housing (10). According to the invention, the hollow area has a section which is configured in the form of a cylindrical ring cavity that is coaxial to the shaft (18). The piston (12), as a ring piston, is configured in the form of a cylindrical tubular section which engages in the ring cavity of the housing (10) and is axially displaceably guided in said ring cavity. The end surfaces (20,26) of the ring cavity and the ring piston (12) facing away towards each other are configured as constant wavy surfaces with an axially parallel amplitude.

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 drive rod has pins on each end of its body. Each pin has tapered threading and little or no undercut thereby enhancing its ability to transfer rotational motion through the drive rod string by increasing the surface area through which torque is transferred. The tapering of the threading on the pins allows for connectors having thicker walls. This means the connectors can withstand higher rotational stress. The drive rods and connectors are especially well suited for use with progressive pumps.

Abstract: A modular oil pump for use in combination with an internal combustion engine having a dry sump lubrication system. The device features a first gerotor pump having an intake port engageable in communication with at least one engine sump and having an discharge port engageable in sealed communication with a fluid reservoir for the dry sump system. A second gerotor pump, engageable in sealed communication with the fluid reservoir has a discharge port fluidly engageable with the engine lubrication system oil supply conduit. Both the first pump and second pump are assembled from separate housings, and cooperatively engaged inner and outer gears sized for rotation and in line mounting on the engine crankshaft inside a cavity in the housings. The volume pumping capacity of the first pump at a ratio to efficiently drain fluid and gas from the engine sumps and supply the reservoir with a constant supply of lubrication fluid.

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: The invention relates to an internal-gear pump for pumping fuel in an internal combustion engine, having an internal-toothed annular gear (11) and an external-toothed pinion (3) that cooperates with the annular gear (11) to generate a pumping action.

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: 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 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: An impeller (20) for a rotary pump (10) of the type having an impeller with flexible blades, the impeller being removably located in a pump housing (40) having a removable end cover for access to the impeller, the impeller (20) including a drive boss (21) having a screw threaded aperture (80) at a free end to permit insertion of a screw threaded shaft (81) which, when rotated, urges the impeller axially off a drive shaft (30) on which it is mounted in use.

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: An eccentric worm pump has a tubular stator extending along a main axis and having an intake side and an output side, an eccentric worm fitting in the stator and centered on a rotor axis offset from the main axis, an intake housing forming an intake compartment opening into the intake side, a connecting shaft extending along the main axis from the rotor through the intake compartment, and a drive shaft extending along the main axis from the connecting shaft out of the intake compartment. The rotor, connecting shaft, and drive shaft are unitarily formed of plastic. A seal housing mounted on the intake housing seals around the drive shaft. A drive connected to the drive shaft rotates the drive shaft, connecting shaft, and rotor about the axis to draw fluid through the stator from the intake side to the output side thereof.

Abstract: A hydraulic machine is proposed, with a drive shaft rotating around a center axis, a drive wheel at a first end of the drive shaft, via which forces, which are characterized by a force component running largely vertical to the center axis, are led to the drive shaft, a second, opposite end of the drive shaft with a pump unit, which is characterized by a first rotating pump element connected to the drive shaft and a fixed pump element which works in conjunction with the first pump element, and with a bearing unit for the drive shaft, the hydraulic machine is characterized by the fact that the bearing unit (33) is offset to the line drawn by the middle axis (13) when the drive shaft (27) is not under load, where the bearing unit (33) is positioned in the direction of the force components relative to the center axis (13).

Abstract: Hydraulic vane machine with a stator having a stator bore with a guiding contour, a rotor arranged in the stator bore and having substantially radially movable vanes bearing on the guiding contour, and a shaft connected fixedly rotatable with the rotor via a coupling. In such a machine the operation behaviour must be improved. For this purpose the coupling has a transmission element located horizontally with the shaft being vertical. The transmission element is radially displaceable relative to the shaft in one direction and is laterally displaceable relative to the rotor in a second direction.

Abstract: A scroll type compressor comprising: a crankshaft having an eccentric shaft portion formed thereon; an orbiting scroll which is given torque by the crankshaft through the eccentric shaft portion; and bearing means for rotatably supporting the crankshaft; wherein at least one of the eccentric shaft portion and the bearing means is constituted by a rotatably engaged bushing and a curved surface portion.