Abstract: An internal gear pump comprising: a ring with internal teeth delimiting a cavity and a gear disposed in the cavity, the gear comprising external teeth cooperating with the internal teeth to drive the ring in rotation, remarkable in that it comprises a pinion disposed in the cavity and driving the gear in rotation. The pinion cooperates with the external toothing of the gear. In an alternative embodiment, the gear comprises an internal toothing which cooperates with the pinion.

Abstract: A pump for pumping a liquid food product, including a star wheel arranged to be driven by an impeller to rotate around an axis that is offset from an axis of rotation of the impeller, an element that extends between a part of the star wheel and the impeller, such that the liquid is pumped when the impeller rotates and thereby drives the star wheel. A channel is formed between the star wheel and an axle on which the star wheel is arranged, such that a part of the product may enter the channel for providing lubrication.

Abstract: In an internally rotating gear pump, a pinion having external teeth and a gear having internal teeth are housed in a casing. The pinion and the gear rotate while the internal teeth and the external teeth are meshed with each other. The pinion is a driving gear that is coupled to a rotating shaft receiving a rotating force from an external motor, such that the pinion and the rotating shaft are rotationally driven in an integrated manner when the rotating shaft is driven. The gear is a driven gear, and is rotatably supported on a gear pin provided to the casing via a gear bush serving as a slide bearing.

Abstract: A liquid pump in the present disclosure includes a pressure container, a shaft, a first bearing, a second bearing, a pump mechanism, and a thrust bearing. The internal space of the pressure container is partitioned into a high pressure side space and a low pressure side space. The shaft has a thrust supported face, one of both ends of the shaft is disposed in the high pressure side space, and the other of both ends of the shaft is disposed in the low pressure side space. The pump mechanism is disposed between the first bearing and the second bearing, and pumps liquid by rotation of the shaft. The thrust bearing is disposed to face the thrust supported face between the first bearing and the second bearing.

Abstract: This document discloses an internal gear pump with a symmetrical casing and a head design that enables high pumping speeds, reduced turbulence and reduced risk or occurrence of cavitation. The head includes a boss that extends into the pump chamber to form an idler support and a crescent support. The crescent support includes a liquid directing step that extends from the crescent arcuately towards the inlet. The liquid directing step divides liquid incoming from the inlet into a portion directed to an idler feed slot and another portion directed to a rotor feed slot. The idler feed slot provides communication between the inlet and the roots of the idler and the rotor feed slot provides communication between the inlet and spaces between the rotor teeth.

Abstract: The invention relates to a double-helical gear rotary positive displacement pump including a pump housing rotatably supporting at least a driving shaft and at least a driven shaft, at least a first toothing and a second toothing being associated to the driving shaft and at least a third toothing and a fourth toothing being associated to the driven shaft. The toothings have individually a helical profile that allows their mutual herringbone meshing. Three of toothings are rigidly connected to their respective shafts. The fourth toothing, or other suitable one, is idle on the shaft and axially constrained.

Abstract: An internal gear pump (1) is proposed for conveying a fluid by a driven pump gear wheel (3) and a ring gear (4), as a gear pair residing in an enclosure, which are, for instance, meshing and hereby generating a sealed area. Hereby, viewed cross-sectionally, a sickle shaped part (5) is provided for sealing the free space, located nearly opposite to the sealed area, whereby a first end piece (12) and a second end piece (13) of the part (5) are assigned to a high pressure area. In accordance with the invention, the two end pieces (12, 13) of the part (5) are constructed differently.

Abstract: An energy transfer machine, for example, a positive displacement internal combustion device, has a fixed or rotating outer housing, an internal rotating carrier and one or more inner rotors with rotational axes which are offset from the inner rotor carrier rotational axis. Circumferentially expandable projections from the outer housing and rotor mesh with each other to define variable volume chambers.

Abstract: The present invention enables the manufacture of a trochoid pump having a crescent which has been considered theoretically impossible, by employing an inner rotor of a trochoid pump. An inner rotor having a predetermined number N of teeth that is equal to or larger than 4 is formed in advance.

Abstract: The present invention enables the manufacture of a trochoid pump having a crescent which has been considered theoretically impossible by employing an inner rotor of a trochoid pump. An inner rotor having a predetermined number N of teeth that is equal to or larger than 4 is formed in advance.

Abstract: An energy transfer machine, for example, a positive displacement internal combustion device, has a fixed outer housing, an internal rotating carrier and one or more inner rotors with rotational axes which are offset from the inner rotor carrier rotational axis. Projections from the fixed outer housing and rotor mesh with each other to define variable volume chambers. In another energy transfer machine, in which the outer housing may be fixed or rotating, projections of the rotor are expandable within cylinders defined by projections of the outer housing.

Abstract: To provide an internal gear pump capable of preventing small vibrations due to pressure differences at the outlet port side of a crescent disposed between the outer rotor and the inner rotor, so that fatigue failure does not occur in the crescent over a long time period, whereby the durability can be increased. The internal gear pump includes a rotor unit, in which an inner rotor is disposed within an outer rotor on the inner peripheral side and a crescent is disposed in the gap between the inner rotor and the outer rotor, the rotor unit being housed in a pump casing. Outer cells are formed by the crescent and the outer rotor. Inner cells are formed by the crescent and the inner rotor. Linking of the outer cells and the outlet port, and linking of the inner cells 6 and the outlet port, start substantially simultaneously.

Abstract: An energy transfer machine, for example, a positive displacement internal combustion device, has a fixed or rotating outer housing, an internal rotating carrier and one or more inner rotors with rotational axes which are offset from the inner rotor carrier rotational axis. Circumferentially expandable projections from the outer housing and rotor mesh with each other to define variable volume chambers.

Abstract: An energy transfer machine, for example, a positive displacement internal combustion device, has a fixed outer housing, an internal rotating carrier and one or more inner rotors with rotational axes which are offset from the inner rotor carrier rotational axis. Projections from the fixed outer housing and rotor mesh with each other to define variable volume chambers. In another energy transfer machine, in which the outer housing may be fixed or rotating, projections of the rotor are expandable within cylinders defined by projections of the outer housing.

Abstract: A hydraulic pump is provided that reduces or eliminates unwanted noise, local pressure waves, pressure pulsations or cavitation and the like through use of pressure and suction chambers that are in substantial fluid isolation except for a backflow connection with a predetermined flow cross section to the suction chamber.

Abstract: The rotary piston power system includes a housing having a drum and a cover rotatably mounted on the drum. The drum has high pressure and low pressure ports defined in its peripheral wall and a central separator wall having arcuate end faces and a pair of semicylindrical recesses defined in opposing sidewalls. A pair of pistons are rotatably mounted on axles on opposite sides of the separator wall and fit closely between the separator wall and the peripheral wall. Each piston has a plurality of radially disposed cylindrical recesses defining slots in the piston's peripheral wall. The cover has a plurality of radially disposed vanes extending into the drum defining a number of cylinders or chambers double the number of recesses defined in a single piston. An input/output shaft extends from the opposite side of the cover for coupling to a prime mover or to a load.

Abstract: A magnetically driven gear pump having a housing, a rotatable annular magnetic drive assembly magnetically coupled to but spaced from an annular driven magnet and rotor gear assembly with an annular canister disposed therebetween, and wherein when the annular magnetic drive assembly is rotated, the annular driven magnet and rotor gear assembly rotate on a first shaft portion of an offset stationary shaft and the rotor gear drives an idler gear that rotates on a second shaft portion of the offset stationary shaft.

Abstract: An internal gear pump including a stepper motor coupled to a drive shaft that is coupled to a rotor and meshed with an idler is disclosed. A controller is linked to the stepper motor. The stepper motor imparts a stepped rotational movement to the drive shaft wherein a single 360° rotation of the drive shaft comprises a plurality of steps. The controller sends a signal to the stepper motor to rotate the drive shaft a predetermined number of steps, based upon an inputted dispense amount. The signal causes the stepper motor to rotate the drive shaft a predetermined number of steps. The controller calculates the predetermined number of steps based upon the inputted dispense amount using an algorithm that is derived experimentally that defines a relationship between dispense amount and the number of steps required for each dispense amount. The algorithm is unique for each fluid to be pumped.

Abstract: An improved gear pump having members with different hardnesses includes a housing defining an internal bore with inlet and outlet passageways. A head member includes a wall between the inlet and outlet passageways and extends toward a toothed rotor. A toothed idler gear meshes with the rotor. The head member and idler gear are made of materials having a hardness greater than that of the rotor material. In one embodiment the idler gear is made of ceramic material whereas the head member and rotor are made of cast iron, with the head member treated to have a hardness greater than that of the rotor.

Abstract: A hydraulic gear machine, in particular an internal gear machine having two gear wheels which mesh with each other in a chamber of a multipart housing, a sealing plate arranged on the side of the two gear wheels axially between them and a housing part, and a pressure field which is present in the housing part on the high-pressure side, is open towards the sealing plate, and is adapted to be acted on by high pressure. The order to provide embodiments of the gear machine which differ in their direction of rotation with the use of many of the same parts, a second pressure field is present in the housing part and the first pressure field is present only on the one side and the second pressure field only on the other side of a center plane which is defined by the axes of rotation of the two gear wheels so that a piece of the housing part is still present between the two pressure fields.

Abstract: An improved rotary, gear within a gear transfer pump, including a pump housing having a circular pumping chamber communicating with a first port and a second port. An externally driven rotor is in meshing relationship with an internal idler gear. To enable the pump to handle an abrasive fluid medium or a non-homogenous pump fluid, an idler gear seal and a shaft seal are employed to contain pumped fluid within the pump chamber. A source of lubricating/flushing fluid is communicated to an idler gear bearing region and a shaft bearing. An idler gear seal includes a "flow resisting" side exposed to pump chamber fluid and a "flow passing" side exposed to lubricating/flushing fluid. The shaft seal includes a "flow resisting" side exposed to pump chamber pressure and a "flow-passing" side exposed to lubricating fluid. A cross-communicating fluid circuit maintains the "flow resisting " sides of both seals at substantially the same pressure.

Abstract: An internal gear pump having the following characteristics: an internal gear; a pinion which meshes with the internal gear and is mounted eccentrically with regard to the internal gear; a shaft supporting the pinion; a central ring-shaped housing part encompassing the internal gear and pinion and comprising a suction socket as well as a pressure socket; on both sides of the central housing part, a ring-shaped housing intermediate part each by which the shaft is supported; a cutout provided in each intermediate part and extending bow-shaped in peripheral direction; a web is provided which bridges the sole cutout; and the web is located at least approximately in that area of the pinion which diametrically opposes the pressure socket.

Abstract: Filler piece (8) of a gear pump or a gearmotor, mounted in an interspace (4), formed from an internal gear (2) and a pinion (3), exhibits a sickle-shaped seal (7), with which laterally projecting pivot pins (6) are connected, and filler piece (8) is designed in one-piece and/or in two parts by a separating gap (14) extending from high-pressure area (13) into low-pressure space (11).

Abstract: A gear pump which includes a housing having an internally toothed gear and a pinion meshing with the internally toothed gear disposed therein. The housing has a sickle-shaped space between the two gears and has therein a filler piece. In order to avoid a fluttering of the filler piece and the noises connected therewith, structure is provided for urging the filler piece, due to pressurized oil being guided from the pressure chamber and one side of the filler piece into a bore extending through the filler piece to the opposite side of the filler piece, against the pump housing. The filler piece can also be locked in the direction of rotation by a pressure piece also loaded by the pressurized oil.

Abstract: A rotary device for interacting with a flow of liquid. The rotary device comprises a casing provided with an inlet opening and an outlet opening. The casing contains a first rotary member having a first axis of rotation (YY') and external teeth, and a second rotary member surrounding the external teeth of the first rotary member and guided to rotate about a second axis (XX') parallel to the first axis. The second rotary member includes two circular rings mounted inside the casing to occupy two respective planes perpendicular to the first axis of rotation (YY'), and a plurality of longitudinal components mounted between the rings to lie parallel with the second axis of rotation (XX'). Each of the longitudinal components has a cross-section in the shape of a gear tooth for meshing with the teeth of the first member. The rings have regularly spaced-apart notches around their peripheries in order to receive the ends of the longitudinal components, the longitudinal components not being fixed to the rings.

Abstract: An internal-gear machine such as a pump comprises an internally toothed annular gear and an externally toothed pinion which meshes with the internal teeth of the annular gear over a portion of the periphery thereof, an arcuate filling member being disposed between the annular gear and the pinion. The annular gear has openings which connect the outside periphery of the annular gear with the inward side thereof in the region of the gaps between the teeth. Each opening is set into the non-bearing flank of the respective tooth which delimits on one side the gap between a pair of teeth, to such an extent that at the same time each opening forms a communication between the root of the respective tooth and the tip of the tooth.

Abstract: A pump, particularly, for pasteous masses, includes a rotatable outer wheel provided with a plurality of inner teeth, a pinion rotatable inside the outer wheel eccentrically thereto and having a plurality of outer teeth, the outer wheel and the pinion forming an intermediate space therebetween, a pressure seqment located in the intermediate space between the outer wheel and the pinion, an inlet and an outlet which are offset relative one another in direction of rotation, and a filling device connected with the inlet, the filling device including a filling container and a feeding element arranged in the filling container and having a feeding direction so as to feed a mass toward the inlet.

Abstract: An internal-gear machine such as a pump comprises a casing with an internally toothed annular gear rotatably mounted therein. An externally toothed pinion meshes with the internal teeth of the annular gear, and a generally sickle-shaped filling member which is split approximately in a circumferential direction is disposed in the clearance between the pinion and the annular gear. The end faces of the filling member portions which are towards the intake side of the machine may be of a convexly curved configuration and bear against a support element fixedly connected only to one wall of the casing so as to be radially slidable thereagainst and also pivotable about a pivot axis parallel to the axis of the pinion. Alternatively the end faces of the filling member portions may be flat and bear radially slidably against an intermediate element pivotally supported on an at least part-cylindrical peg fixed to only one wall of the casing.

Abstract: In an internal gear pump comprising a ring gear and a pinion in mesh therewith to define a lunate cavity therebetween, a segmented part-lunate filler inserted in said cavity has supporting faces contacting a pin which extends axially through the cavity and is rotatable about its longitudinal axis. In operation, the resulting forces acting on the filler segments are transmitted to the pin by said supporting faces and produce a torque about the longitudinal pin axis.

Abstract: An internal gear pump motor having a housing, a pinion and an internal gear rotatably supported in the housing and meshing with each other, and filler piece means located in a space defined between the pinion and internal gear for dividing the space into two regions providing a low pressure region and a high pressure region during operation. The filler piece means includes at least one filler piece floatingly mounted within the space and having portions capable of coming into sliding engagement with tooth crests of the pinion and internal gear respectively in a portion of the space where the distance between the tooth crests of the pinion and internal gear is reduced toward the low pressure region. A stopper pin is secured to the housing operative to engage one end of the filler piece on the side of the low pressure region for restricting the circumferential movement of the filler piece toward the low pressure region.

Abstract: A rotary gas compressor or expansion motor with a housing having circumferentially spaced inlet and outlet ports. An outer cage or sleeve rotor has alternate slots and teeth. An inner lobe rotor has lobes which mesh with the slots of the cage rotor as the two rotate. The space between the two rotors is filled with a crescent-shaped housing member. The slots, teeth and lobes of the rotors are helical.

Abstract: A rotary pump for hot pitch, asphalt and like viscous solidifiable material, having a cylindrical outer extension on a packing gland to provide an elongated passage around a driving shaft, thereby allowing leaking material to solidify and be reduced into powder before falling from the outer end of the packing gland.

Abstract: Relating to use in 4-stroke displacement engines which were disclosed in a prior patent, this improvement prevents free communication of fluid and reduces internal leakage through the ported pass or between the two displacement sections of these machines.

Abstract: A method and apparatus for simultaneously generating and pumping foam. As air is being pumped, foam solution is transmitted through a number of bores formed in at least one of the pump's pumping members, whereupon foam is generated when the solution emerges from the bores and is discharged at the pump's outlet.

Abstract: A metering device for plastic materials comprising a bin having a rotating feed disc at the bottom thereof. The feed disc has peripheral cogs which partially define a metering chamber. Facing the metering disc is an ejection disc having teeth meshing with the cogs for forcing material into the metering chamber and ejecting the material from the metering chamber through an opening in the side of the bin.