Abstract: Provided is a hydraulic orbital machine and a method of adjusting a hydraulic orbital machine comprising a first and a second lobed disk which rotate eccentrically about a rotation axis and within respective rotors; the machine is characterized by the fact that it has adjustment means designed to mutually angularly offset the angles at which, when the machine is at a standstill, the chambers defined between the lobed disks and the stator have minimum volume.

Abstract: An oil pump is configured to include a rotor, a drive shaft that drives the rotor to rotate, a rotor chamber in which the rotor is contained, an inlet port and an outlet port each provided in the vicinity of the rotor chamber, and a pump cover. The pump cover is made of a resin. On a portion of an outer surface side of the pump cover corresponding to an inner portion, in which oil circulates, of the pump cover, a rib that has an erecting wall shape is provided.

Abstract: A screw compressor includes two screw rotors and two control sliders that are arranged one behind the other in a slider channel. The control sliders have a combined position with mutually facing end surfaces sealing tightly with each other, and being movable together and have a separated position, with positionable spacing from one another, forming an intermediate space. In a transfer position between the combined and separated positions, the control sliders form an inflow chamber into which the medium to be compressed flows out of one of the compression chambers by passing between the mutually facing end surfaces of the control sliders. One of the control sliders is provided with at least one outflow outlet that is adjacent to the inflow chamber and through which the medium from the inflow chamber enters an outflow opening in the slider channel that overlaps with the outflow outlet in this transfer position.

Abstract: A variable oil pump includes a pump housing, a cover, an oil pump rotor rotationally driven while housed in a housing space between the pump housing and the cover, an adjustment member housed in the housing space to adjust the amount of oil discharged from the oil pump rotor by being displaced due to a drive force while rotatably holding the oil pump rotor from an outer peripheral side, and a guide portion including a groove in the adjustment member and a pin on the pump housing that engage one another. Engagement of the pin and the groove guides displacement of the adjustment member relative to the pump housing. A seal structure on at least one of the pump housing and the cover seals the inside of the groove relative to the housing space by surrounding a movement trajectory of the groove relative to the pin.

Abstract: A variable oil pump includes a pump housing, an oil pump rotor accommodated in the pump housing, an adjustment member accommodated in the pump housing and configured to adjust a discharge amount of oil discharged from the oil pump rotor by displacing in a state where the adjustment member holds the oil pump rotor from an outer circumferential side in such a manner that the oil pump rotor is rotatable, and a guide portion including a guide hole provided at the adjustment member and a pin provided at the pump housing and engaging with the guide hole. The guide portion is configured to guide a displacement of the adjustment member relative to the pump housing by allowing the guide hole and the pin to engage with each other. The variable oil pump includes a drain passage configured to drain oil accumulated in the guide hole.

Abstract: A variable displacement oil pump includes an adjustable member that is configured to shift according to changes in pressure inside a control oil chamber. The adjustable member has a long hole. A guide pin is disposed inside the long hole. The guide pin is fixed to either a housing or a cover of the variable displacement oil pump. The width of the long hole is larger at a part of the long hole farther away from a fixed end of the guide pin in its lengthwise direction than at a part thereof closer to the fixed end.

Abstract: A variable flow external rotor hydraulic machine (10, 10?) has an inlet (26, 26?) an outlet (28, 28?), a rotor set having a first rotor (58, 58?) mounted for rotation about a first rotor axis and a second rotor (68, 68?) mounted for rotation about a second rotor axis, the machine being configured as either a pump or a motor, in which at least one of the first and second rotor axes is movable relative to the other to vary a leakage flow between the rotors.

Abstract: The internal gear pump includes: an inner rotor; an outer rotor that rotates by having predetermined eccentricity to a rotation center of the inner rotor; an outer ring that holds the outer rotor in a freely rotatable state, and is also formed with at least three cam protruded parts; a pump housing having a rotor chamber; protruded-wall surface parts that are formed on an inner periphery side surface of the rotor chamber and are also formed in the same number as that of the cam protruded parts; and operation means for oscillating the outer ring. A diameter center of the holding-inner peripheral part of the outer ring is moved by the operation means along a locus of a circle of which a radius is the eccentricity to the rotation center of the inner rotor.

Abstract: An oil pump includes: an inner rotor rotatable with a drive shaft in a unified manner on a drive-rotation axis; an outer rotor which has inner teeth configured to engage with outer teeth of the inner rotor and is rotatable about a driven axis eccentric to the drive-rotation axis; and an adjustment ring for rotatably supporting the outer rotor. A guide means which allows the adjustment ring to rotate about the driven axis, while allowing the driven axis to revolve about the drive-rotation axis, is formed of: first and second arm portions provided on the adjustment ring; and first and second guide faces with which the first and second arm portions are brought into slidable contact.

Abstract: An oil pump includes an inner rotor, an outer rotor, an outer ring, and a pump housing including a suction port and a discharge port, and including a first seal land formed between a terminal end section of the suction port and a start end section of the discharge port, and moreover including a rotor chamber that houses the inner rotor, the outer rotor, and the outer ring. In swing of an angle from an initial position to a final position of the outer ring, a final position eccentric axis connecting a rotation center of the inner rotor and a rotation center of the outer rotor is turnable in an area of an angle exceeding 90 degrees on the suction port side with respect to an initial position eccentric axis.

Abstract: Systems and methods are used to control operation of a rotary compressor of a refrigeration system to improve efficiency by varying the volume ratio and the speed of the compressor in response to current operating and load conditions. The volume of the axial and/or radial discharge ports of the compressor can be varied to provide a volume ratio corresponding to operating conditions. In addition, permanent magnet motors and/or control of rotor tip speed can be employed for further efficiency gains.

Abstract: A variable flow external rotor hydraulic machine (10, 10?) has an inlet (26, 26?) an outlet (28, 28?), a rotor set having a first rotor (58, 58?) mounted for rotation about a first rotor axis and a second rotor (68, 68?) mounted for rotation about a second rotor axis, the machine being configured as either a pump or a motor, in which at least one of the first and second rotor axes is movable relative to the other to vary a leakage flow between the rotors.

Abstract: According to one embodiment of the invention, an engine system comprises a housing, an outer gerotor, an inner gerotor, a tip inlet port, a face inlet port, and a tip outlet port. The housing has a first sidewall, a second sidewall, a first endwall, and a second endwall. The outer gerotor is at least partially disposed in the housing and at least partially defines an outer gerotor chamber. The inner gerotor is at least partially disposed within the outer gerotor chamber. The tip inlet port is formed in the first sidewall and allows fluid to enter the outer gerotor chamber. The face inlet port is formed in the first endwall and allows fluid to enter the outer gerotor chamber. The tip outlet port is formed in the second sidewall and allows fluid to exit the outer gerotor chamber.

Abstract: A variable-efficiency screw compressor for use in a closed-loop system configured to perform refrigeration is provided. The variable-efficiency screw compressor includes an inlet port to draw refrigerant into the variable-efficiency screw compressor, one or more rotating screws in fluid communication with the inlet port to compress the refrigerant, forming a compressed refrigerant, a discharge port in fluid communication with the rotating screws to receive the compressed refrigerant and discharge the refrigerant, wherein the discharge port includes an adjustable piston movable within the discharge port from a first position in which volume is higher to a second position in which volume is lower, the adjustable piston arranged and disposed to adjust volume of the discharge port in response to a change in demand.

Abstract: The internal gear pump includes: an inner rotor; an outer rotor that rotates by having predetermined eccentricity to a rotation center of the inner rotor; an outer ring that holds the outer rotor in a freely rotatable state, and is also formed with at least three cam protruded parts; a pump housing having a rotor chamber; protruded-wall surface parts that are formed on an inner periphery side surface of the rotor chamber and are also formed in the same number as that of the cam protruded parts; and operation means for oscillating the outer ring. A diameter center of the holding-inner peripheral part of the outer ring is moved by the operation means along a locus of a circle of which a radius is the eccentricity to the rotation center of the inner rotor.

Abstract: The internal gear pump according to the present invention includes: an inner rotor; an outer rotor that rotates with predetermined eccentricity to a rotation center of the inner rotor; an outer ring that rotatably holds the outer rotor, and has at least three cam protruded parts formed; a pump housing that has a rotor chamber; pins in the same number as that of the cam protruded parts; and operation means for oscillating the outer ring. Positions of the pins are set so that a diameter center of the holding-inner peripheral part of the outer ring is moved by the operation means along a locus of a circle, the radius of which is the eccentricity to the rotation center of the inner rotor.

Abstract: A motion-powered liquid sprayer that can increase the number of rotations of the pump relative to each rotation of the wheel or axle is provided. The sprayer can include a gearing assembly that employs gears to increase the number of pump revolutions as a function of the wheel or axle rotation. The sprayer can also include a gear pump that employs an over-capacity or enhanced gullet together with blow-by spacing to control consistent liquid flow relative to variable motional velocities. Further, the sprayer can include a vertically adjustable nozzle as well as a free reverse rotation wheel hub.

Abstract: A rotor assembly for a multi-stage pump is provided. The assembly includes a drive shaft, a rotor component and a drive component. The rotor component is located on the drive shaft and includes a rotor element for displacing fluid through the pump when the drive shaft is rotated. The drive component is anchored to the drive shaft and transmits torque from the drive shaft to the rotor component to effect rotation of the rotor component. A sleeve element is integrated with either the drive component or the rotor component and is used to space the rotor element from the drive component. An interface surface is located on the sleeve element for interacting with the other one of the drive component and the rotor component in order to maintain orthogonal alignment between the rotor element and the drive shaft. A driver is provided for transmitting torque between the drive component and the rotor component.

Abstract: A variable displacement pump includes a pump body defining first and second pools for introducing fuel/lubricant oil, and internal and external rotary members rotatably mounted on the pump body and cooperatively defining a space such that, during counterclockwise revolution, the fuel/lubricant oil is taken up from the first pool by sweeping of the space over the first pool, and is delivered to the second pool. A control slider is sleeved on the external rotary member, and has an actuated tooth moved by an expansion force in the second pool to counteract the external rotary member so as to reduce the volume of the space, thereby reducing delivery of the fuel/lubricant oil into the second pool. A biasing member is disposed to bias the actuated tooth towards the second pool.

Abstract: An oil pump in which pulsation vibration due to the dynamic pressure on the discharge port side can be attenuated. In an oil pump for transporting fluid from a suction port to a discharge port by the rotation of a rotor mounted in a pump casing, a resonator configured from an introduction path and a chamber is formed with respect to a discharge flow channel that communicates with the discharge port in the flow direction of the discharge flow channel. A channel in a direction different to the flow direction of the discharge flow channel is communicatingly formed in the vicinity of the resonator.

Abstract: An oil pump includes pump chambers each having a volume varied by engine drive and for pressurizing oil inhaled through an inlet port and discharge it through an outlet port, and a branch passage connected between upstream and downstream sides of the outlet port at branch and confluent points, wherein the branch passage in the vicinity of the confluent point is shifted in pulse-pressure phase with respect to the outlet port.

Abstract: Rotary seals in a telescoping gear pump/motor a feature that allows the seal to shift radially relative to other components while maintaining the seal integrity and without compromising the function of the bearings or the bushings needed to bear the load.

Abstract: A variable capacity pump/motor has a meshing internal and external gear set disposed between an upper mandrel and a lower mandrel, each including a flange extending towards the gears to divide a pump/motor chamber into suction and discharge chambers. The inner gear is fixed and the external gear is axially moveable with respect thereto. The external gear and the upper mandrel move in response to changing pressures in the casing, allowing the motor to vary displacement and the pump to vary its output based on supplied fluid pressure or based on the speed of the prime mover. An external configuration includes a pair of meshing gears mounted on separate shafts in a casing. One gear is fixed and the other is axially moveable with respect thereto and moves in response to changing pressures in the casing. Each of the gears is sealed by a seal/bushing on a free end thereof.

Abstract: An internal combustion rotary engine is described, adapted to be used both for motor vehicles and ground machines (alternators, compressors, pumps and the like) or water craft or any type. The used fuels are the same of the presently used reciprocating engines. This engine comprises two rotors one inside the other, rotating in the same direction and at the same number of revolutions on two non concentric axes. The eccentricity between the two axes creates a crescent like chamber divided into four parts by four mobile elements mounted on the internal rotor, said elements being in turn constituted by two bodies that fit continuously to the inner surface of the external rotor thus ensuring the tight seal between the chambers. The efficiency of this motor is more than double of a reciprocating engine of the same displacement, with consequent halving of consumptions and emissions of carbon monoxide and dioxide.

Abstract: The present invention relates to a screw compressor and a method for operating the compressor primarily for gaseous refrigerants, comprising a compressor housing, which comprises a male and a female screw rotor arranged in screw rotor bores in the compressor housing, which male and female rotor are co-rotatingly drivable and interacting for compressing the refrigerant, which screw compressor comprises at least one slider, which slider is movable in relation to the male and the female rotor, where movement of the slider controls the internal volume ratio of the screw compressor, which slider is moveable in a slider housing, which slider is in a direction sideways to the plane formed by the rotational axes of the male and the female rotor, which slider is interacting with the male and the female rotor. It is the object of the invention to develop a highly effective screw compressor, which screw compressor can regulate the discharge pressure.

Abstract: A variable capacity gerotor pump includes an inner rotor that is axially displaceable with respect to the outer rotor to vary the volumetric capacity of the pump. An active piston abuts the lower surface of the inner rotor and can ride inside the outer rotor, as the inner rotor is axially displaced, to provide the necessary scaling of the lower surface of the inner rotor with respect to the outer rotor. A passive piston, against which a return spring acts, abuts the upper surface of the inner rotor to provide the necessary sealing of the upper surface of the inner rotor with respect to the outer rotor. In an embodiment, a control chamber, supplied with pressurized working fluid, generates a force acting against the force of the return spring to move the inner rotor to reduce the volumetric capacity of the pump. In another embodiment, a control mechanism, such as an electric solenoid or mechanical mechanism, acts on the control piston against the force of the return spring.

Abstract: An oil pump to be insatalled to an engine of an automotive vehicle. The oil pump includes a section defining a suction port and a section defining a discharge port. A main unit of the oil pump has a section defining a plurality of pump chambers. Volume of each pump chamber continuously changes to increase and decrease under driving of the engine so as to pressurize oil sucked through the suction port and discharge the oil through the discharge port. A section defining an oil chamber to which the oil flows is provided such that the oil chamber has a vertically upper side which is communicated with the discharge port through a communicating hole.

Abstract: A variable capacity pump/motor has a meshing internal and external gear set disposed between an upper mandrel and a lower mandrel, each including a flange extending towards the gears to divide a pump/motor chamber into suction and discharge chambers. The outer gear is fixed and the internal gear is axially moveable with respect thereto. The inner gear and the upper mandrel move in response to changing pressures in the casing, allowing the motor to vary displacement and the pump to vary its output based on supplied fluid pressure or based on the speed of the prime mover. An external configuration includes a pair of meshing gears mounted on separate shafts in a casing. One gear is fixed and the other is axially moveable with respect thereto and moves in response to changing pressures in the casing. Each of the gears is sealed by a seal/bushing on a free end thereof.

Abstract: Rotational pump with variable volume flow, comprising a pump housing having a suction connection and a pressure connection, an outer rotor with inner toothing which is rotatably disposed inside the housing, and an inner rotor with outer toothing which is eccentrically disposed in the outer rotor, and which can be driven by a drive shaft which is disposed in the pump housing parallel to the axis of the outer rotor, wherein a rotatable adjusting ring is provided coaxially to the drive shaft to change the volume flow in the pump housing, and in which the outer rotor is eccentrically and rotatably disposed, characterized in that a slider, which can change the size of at least one of the connections, is disposed, as viewed in the turning direction, between the pressure connection and the suction connection.

Abstract: A positive displacement device that incorporates two rotors that are offset from collinear and each comprising a first and second set of vanes where the engagement surfaces of the first set of vanes are adapted to only engage when the rotors are in the top dead center location and the second set of lobes of each rotor only engage one another at the bottom dead center position of rotataion.

Abstract: An internal gear pump for pumping fuel from a suction conduit (18) into a pressure conduit (19) has a pump housing (1) in which an internal ring gear (5) and an externally toothed pinion (3), the latter driven by a drive shaft (2), are supported. The pinion (3) is disposed eccentrically to the ring gear (5) and cooperates with the ring gear (5) to generate a pumping action. The pinion (3) and the ring gear (5) rest with their one face end on the pump housing (1) and with their other face end on a sealing plate (13). To lengthen the service life of the internal gear pump, the suction conduit (18) is disposed in the sealing plate (13). The sealing plate (13) is movable relative to the pump housing (1) such that the spacing between the suction conduit (18) and the pressure conduit (19) can be varied.

Abstract: An internal gear pump has a housing, a toothed ring provided with inner teeth, a bearing ring supporting the toothed ring in the housing rotatably about a rotary axis, a toothed gear provided with outer teeth and engaging with the toothed ring, the toothed gear being rotatable in the housing about a rotary axis, the toothed gear or the toothed ring being rotatably driven, the rotary axis of the toothed ring being offset relative to the rotary axis of the toothed gear, and an adjusting device associated with the bearing ring for moving the bearing ring in a radial direction relative to the rotary axis of the toothed ring in the housing for an adjustment and for blocking it in an adjusted position.

Abstract: An infinitely variable ring gear pump comprising a stationary casing, an internal rotor (3) in said casing rotatably supported and driven by means of a shaft (2) and an external rotor (4) likewise rotatably supported, meshing with the internal rotor (3), the difference in the number of teeth of the gear ring running set comprising the internal rotor (3) and the external rotor (4) being equal to unity, having a tooth shape in which a plurality of expanding and contracting displacement cells (7) each sealed off from the other materializes due to tooth tip contact and kidney-shaped low and high-pressure ports (8, 9) fixedly arranged laterally in the region of the displacement cells (7) being provided in the casing, the ports (8, 9) being separated from each other by webs (10, 11) and the angular position of the eccentric axis (eccentricity 17) of the ring gear running set (5) being variable relative to the casing.

Abstract: The invention comprises a rotary piston machine, which functions as a pump, compressor or engine, and in which the cogs (45) of teeth (46) of a rotating control part travel over a cycloidal surface (44) of a cycloidal part (42) in order to define work chambers (28), wherein the cycloidal part (42) likewise rotates (FIG. 10).

Abstract: A gerotor pump or rotary fluid power transmission having a displacement control device for changing the volume of fluid delivered. The displacement control device operates by changing the eccentric position between the inner and outer rotors. The inlet and outlet ports of the pump are kept separate to maintain a unidirectional flow from the inlet to the outlet port across open mesh crossover zone. The closed mesh crossover zone is moved relative to the open mesh crossover zone and maintains separation between the inlet and outlet ports. As the eccentric position of the outer rotor relative to the inner rotor is changed, the volume of fluid transferred from the inlet port to the outlet port over the open mesh crossover zone is varied between a minimum and maximum amount. In one embodiment, the displacement control device is manually shifted.

Abstract: An external axis rotary piston compressor having a housing formed with at least two overlapping, parallel-axis cylindrical inner chambers each having a shaft passing therethrough. On the one shaft there is a cylindrical working rotor forming an annular working chamber with the housing wall surrounding the same, and including a shutoff tooth or projection. On the other shaft, which rotates counter thereto, there is provided a cylindrical shutoff rotor which runs along the housing wall and rides on the working rotor; this shutoff rotor includes a recess for engagement-free passage of the shutoff tooth or projection therethrough.

Abstract: A control device for a positionable pump has a body with inner and outer diameters eccentric to each other mounted in the pump housing bore and is actuated by hydraulic pressure in one angular direction. An opposing spring force acts in the opposite direction for controlling the angular position of the body. A controlled member is nested in the inside diameter of the body and a power rotated control member is nested within and drivingly engages the controlled member and is eccentric thereto, being a pair of pumping elements. The pump elements being gerotor or vane type elements utilized to pump fluids and which depend upon the eccentric position of their relative components for a fixed delivery of fluids. The body is controlled in infinitely angular positions relative to the pump housing to regulate the eccentric position of such pumping elements and thereby controlling the volume output of said pump elements relative to the demand of the external system increasing and diminishing needs.

Abstract: A positive displacement pumping action is obtained from two meshed scroll ne impellers by mounting the two impellers on parallel but offset drive shafts and rotating them synchronously in the same direction.

Abstract: An internal-external gear pump wherein the fluid displacement thereof is variable. The internal gear is rotatably driven by a drive shaft about a fixed axis and the external gear is rotatably driven by the internal gear about a controlled movable axis eccentric to the fixed axis. Movement of the external gear axis causes the eccentricity between the internal and external gear axes to vary, thereby resulting in a change in the depth of gear tooth mesh such that the volume of fluid displaced by the meshing teeth is varied. The position of the external gear axis is established by a control ring which rotatably supports the external gear, and is mounted in a stationary housing so as to be rotatably positionable within arcuate limits about a fixed axis eccentric to both the axes of the internal and external gears.

Abstract: A rotary gear pump comprising two excentrically arranged gear wheels of different sizes, of which the greater gear wheel is rotatably mounted in the generally cylindrical housing of the pump and the smaller gear wheel is mounted upon a shaft which is arranged excentrically in the housing of the pump in such a way that the teeth of the two gear wheels, in the working condition of the pump, are mutually engaged along an area of the inner circumference of the housing of the pump between the outlet of the pump and the inlet of the pump, and are arranged with an interspace between the top circles of the teeth along another part of the circumferences of the wheels, a blocking member being arranged in the interspace with one surface of the blocking member sealing against teeth of the smaller gear wheel and with another surface of the blocking member sealing against teeth of the greater gear wheel, wherein the shaft and the blocking member are mounted rotatably in the housing about the axis of the greater gear wheel