Abstract: A gear pump that selectively directs lubrication to certain components within the pump. A system and method of retrofitting existing pumps to improve their longevity in the field. The system and method provides a clean, simple, efficient, and elegant improvement to current gear pump fuel delivery systems.

Abstract: An example assembly comprises: a pump cover; a thrust plate configured to interface with the pump cover at a first side of the thrust plate and interface with gears of a gear pump at a second side of the thrust plate; and a seal disposed within a seal cavity formed at an interface between the thrust plate and the pump cover, wherein the seal defines multiple partitions at the interface between the thrust plate and the pump cover and seals each partition of the multiple partitions from other partitions.

Abstract: A pump technology that provides for more effective and efficient transfer of liquids, such as petroleum products and components, to and through pipelines. Such a technology can comprise a type of external gear pump that creates higher flow, resulting in higher pressures in the pipeline, to move the liquids, while providing for longer pump life, simpler and less maintenance, and fewer undesired conditions, with a smaller footprint, in a cost-effective system. Further, one or more portions of the pump can be configured to be easily replaceable to provide for maintenance in place, and provide for longer pump life. Additionally, one or more portions of the pump can be constructed with or coated with abrasive resistant material that extends the life of the external gear pump. Such material can also reduce the friction between surfaces and improve the life of the external gear pump under poor feeding conditions.

Abstract: The invention relates to a rotary sliding vane machine (1) for fluid processing, comprising a housing (2) with a cavity (4) with a rotor (9). Vanes (12) are arranged in outwardly directed slots (13) in the rotor (9), and relative sliding between the vanes and the rotor provides spaces with variable volumes in the rotational direction. Each vane is supported by hydrostatic slide bearings (20, 20?) on each side of the vane (12). Due to pressure changes of the process fluid, the vane (12) is tilted towards and away from bearing pads (27, 27, 87). The invention causes the bearing pads to adjust their position to the vane (12), and also causes a change of volume of a bearing fluid chamber (21, 21?, 81), which in turn effects a supply of bearing fluid to the slide bearing fluid film.

Abstract: Devices and systems relating to external gear machines that comprise microsurface shaping on the lateral surfaces of the gear teeth and/or bushing surfaces are provided. Such microsurface shaping may comprise a flat step to linear wedge profile, a flat step to flat step profile, or solely a linear wedge profile. The incorporation of microsurface shaping on the gear teeth and/or bushing plates contributes to improving the lubrication performance within the external gear machine and provides significant benefits, including the improvement of operating efficiency, life, and reliability of the system components. Methods for manufacturing the gear teeth and related bushings are also provided, the methods configured to optimize the overall axial balance within the system.

Abstract: Provided is a gear pump or a motor provided with: a casing internally provided with a gear housing compartment in which a pair of gears are housed; a side plate interposed between the casing and the gears; and a gasket which is disposed on a non-slide surface, and which divides a space between the non-slide surface and the casing into a high pressure side and a low pressure side. The gear pump or the motor is configured such that, in order to discover early the mounting of the side plate in a wrong attitude, such as the upper and lower sides thereof being reversed or the high pressure portion side and the low pressure portion side being reversed, flow rate efficiency is decreased when the side plate is in an attitude other than a predetermined attitude, compared to when the side plate is in the predetermined attitude.

Abstract: A drive device includes a rotor, a stator, a housing including an accommodation portion to store oil, and a pump driven through a motor shaft. The pump includes an external gear fixed to an end on one side in an axial direction of the motor shaft, an internal gear surrounding a radial outside of the external gear and meshing with the external gear, a pump room accommodating the internal gear and the external gear, a suction port through which the oil is to be sucked into the pump room, and a discharge port through which the oil is to be discharged from the pump room. The housing includes an outer lid in which the pump room is provided.

Abstract: A pump bearing including a top face, a side face peripherally surrounding the top face, a bottom face opposed to the top face, a first bearing bore projecting from the top face to the bottom face, an edge defined where the top face meets the side face, and an asymmetric pressure balance groove defined within a portion of the edge of the top face and the side face defining first depth from the top face.

Abstract: A gear pump can be equipped in an engine oil system. The gear pump has a housing, a first gear, and a second gear. The housing has an outlet passage for exiting oil, and has one or more outlet openings for exiting air. The first gear has a set of first teeth with multiple first roots and first tips. The second gear has a set of second teeth with multiple second roots and second tips. The outlet opening(s) is situated in the housing so that it can communicate with a first clearance, with a second clearance, or with both the first and second clearances. The first clearance is established at the confrontation of one of the first roots and one of the second tips. And the second clearance is established at the confrontation of one of the second roots and one of the first tips.

Abstract: A bearing for a gear pump includes a bearing body defining a bearing bore defined therethrough along an axis for receiving a gear shaft. The bearing bore defines a cylindrical bearing inner diameter surface. The bearing body defines an outer mating surface configured for mounting to another bearing body. A groove is defined in the inner diameter surface along an axial direction relative to the axis to provide clearance for gear journal motion between the inner diameter surface and the gear shaft. The groove is defined in a portion of the inner diameter surface opposite the mating surface.

Abstract: An internal combustion engine having at least one crankcase for defining a guide housing in which at least one crankshaft is guided in rotation about an axis of rotation and lubricated by a lubricating fluid, the at least one crankcase being of the “dry-sump” type. Such an internal combustion engine has at least two pumps forming a pump train of pumps on a common axis, the pump train being fitted in a cylindrical bore of the at least one crankcase.

Abstract: An oil pump, in particular an electric or electromotive auxiliary pump for a motor vehicle, having a housing having an inlet on the admission side and an outlet on the pressure side, in addition to a pump rotor which is inserted in the housing such that it can rotate about an axis, and having at least one rotor part, a flexible housing component which is in the form of an elastic press plate and which extends over the cross-sectional surface of the pump rotor. The flexible pressure plate is maintained, in an advantageous manner, in the edge area of the second housing parts.

Abstract: The disclosure allows a gasket to be securely attached to a gasket groove, reduces a time for an operation of attaching the gasket to the gasket groove, and allows differentiation between gaskets of different materials. A gear pump or a motor, including gears which mesh together and form a pair, axes for pivotally supporting the gears, a body having a gear storing chamber internally for placing the gears, a cover for covering the gear storing chamber of the body, is characterized in that a gasket is disposed between the body and the cover, wherein the gasket is insertable to a gasket groove disposed on at least one of the body and the cover, the gasket groove having a shape surrounding the gear storing chamber, and the gasket sticks closely to the gasket groove due to an elastic restoring force when inserted to the gasket groove.

Abstract: A transfer pump configured to move a hydraulic fluid in a hydraulic fluid management system of a hydraulic system of a vehicle including a transmission. In one embodiment, the transfer pump moves the fluid from a differential case to a hydraulic reservoir coupled to the transmission. The transfer pump is a positive displacement pump including an unloading device, such as a sealing plate, that is resiliently biased against the pump during a normal operation but is moved away from the pump upon the application of a pilot pressure. The result is an open chamber for the pump gears to turn without developing pressure, to thereby reduce parasitic losses.

Abstract: A liquid pump includes a pump assembly attached to a motor. The pump assembly includes an inlet chamber and pump chamber. The pump chamber accommodates a drive gear driven by an output shaft of the motor and driven gear meshed with the drive gear. An inner cover is disposed within the pump chamber. An outer cover overlies the inner cover with an elastic member disposed there between. The outer cover exerts a force to the inner cover through the elastic member and holds the inner cover in sliding contact with an axial end of the drive and driven gears. An outlet chamber formed between the inner cover and the outer cover is in fluid communication with and the pump chamber.

Abstract: A geared fuel pump (4?) operates to supply a determined flow but at low or zero pressure rise. It is planned to add gland packing (46) between support bearings (19) of the pinions (11), or between some of them, to provide hydrodynamic lift for these bearings, by delimiting a closed cavity (47) to provide lift by a fluid with better viscosity properties instead of using the fluid itself that is pumped. Possible application to fuel pumps for aircraft engines, in which the pump (4?) is a high pressure pump associated with a low pressure pump.

Abstract: A fluid pump includes a housing defining a cavity. An end plate is disposed within the cavity and divides the cavity into a gear section and an end section. A gear set is disposed within the gear section and comprises at least one gear rotatable about an axis. The end plate is movable longitudinally along the axis for compressing the gear set. A channel is in fluidic communication with the end section for supplying a fluid to the end section to force the plate toward the gear set.

Abstract: In accordance with one embodiment, the gear pump comprises a first gear meshed with a second gear as well as a housing, in which the gears are supported. The housing includes a first void, which at least partly adjoins a first side surface of the first gear, and a second void, which at least partly adjoins a second side surface of the first gear. The gear pump further comprises a fluid intake channel configured to direct fluid towards the gears, wherein at least one deflector is arranged within the fluid intake such that an incident fluid flow is diverted towards the first void as well as to the second void.

Abstract: A rotary fluid machine that reduces fluid leakage from a gear pump or gear motor and achieves improvement in responsiveness is provided. The present invention is configured such that force of pressing a side plate toward gears by a seal member provided between the side plate and a case and performing pressure compartment is partly strong, not uniform along the entire length of the seal member. Specifically, for example, a gear pump comprises an assembly including a pair of gears, a side plate sealing a side surface of the gears, and a seal block sealing tooth tips of the gears, a case housing the pump assembly, and a seal member being arranged between the side plate or the seal block and the case and along a notch portion formed in the side plate or the seal block. The seal member is wider at a portion in a position passing through a place with large pressure fluctuations than at other portions.

Abstract: A vane pump unit assembled into a housing includes a rotor; a plurality of vanes; a cam ring; a first plate; a second plate; a connecting bar that has a first end portion fixed to the first plate, and a second end portion which protrudes from the second plate; and a clip that prevents the second plate and the cam ring from slipping out of the connecting bar. Before the clip is assembled into the housing, the retaining of the clip is positioned at least either between the first plate and the cam ring or between the second plate and the cam ring, in a place where a gap is formed. After the clip is assembled into the housing, the housing interposes the first plate, the cam ring, and the second plate in the axial direction, and the first and second plates are in close contact with the cam ring.

Abstract: An internal gear pump for a slip-controlled hydraulic vehicle braking system includes a pump shaft that is mounted rotatably on one side of a pinion and a ring gear that is mounted rotatably in an axial disk. The axial disk seals off the pinion and the ring gear at the sides.

Abstract: A pump includes: a housing in which a pump chamber that is a columnar space is formed, the pump chamber being provided with a suction-side groove and a discharge-side groove that are formed as recesses; an outer rotor rotatably disposed in the pump chamber and having internal teeth on an inner periphery of the outer rotor; and an inner rotor disposed radially inward of the internal teeth of the outer rotor, and having external teeth formed on an outer periphery of the inner rotor and meshed with the internal teeth of the outer rotor. A portion of an inner edge of the discharge-side groove is located radially inward of a locus of tooth tips of the internal teeth of the outer rotor, the portion being located in a second half region of the discharge-side groove in a rotational direction of the inner rotor and the outer rotor.

Abstract: A gear machine comprises a housing, at least two gearwheels positioned within the housing, and a bearing body defining a circular-cylindrical outer surface segment and a bearing bore. The at least two gearwheels configured to mesh in external engagement with each other. At least one of the gearwheels includes at least one bearing journal rotatably positioned within the bearing bore. The bearing body is positioned within the housing with the circular-cylindrical outer surface segment engaging a corresponding bearing surface defined on the inside of the housing. Each of the at least two gearwheels includes a plurality of tooth tips configured to engage a corresponding sealing surface defined on the inside of the housing. At least one segment of at least one of the sealing surface and the bearing bore is eccentric with respect to the circular-cylindrical outer surface segment of the bearing body. A method of production is also provided.

Abstract: A pump casing has two external communication holes communicating with an outside. A partition member partitioning an interior of the pump casing into a first space and a second space. The first space communicates with the two external communication holes. The partition member have two internal communication holes communicating the first space with the second space. A first rotor member is rotatably accommodated in the first space. A second rotor member is rotatably accommodated in the second space. A torque switching unit is configured to switch between transmission of a running torque selectively to the first rotor member and transmission of the running torque to both the first rotor member and the second rotor member.

Abstract: An electric oil pump is coupled to a pump receptacle including an oil inflow passage and an oil outflow passage. The electric oil pump includes a motor, a pump rotor, a housing, and a check valve. The housing accommodates the motor and the pump rotor. The housing closes an opening of the pump receptacle and includes at least a fitted portion fitted into the pump receptacle. An oil compartment is formed between the pump receptacle and the housing. Oil flows into the oil compartment from the oil inflow passage when the pump rotor is rotated. The fitted portion is partially immersed in the oil collected in the oil compartment. The housing includes a suction port and a discharge port. A check valve, located in the housing, limits reversed flow of the oil from the oil compartment to the oil inflow passage.

Abstract: An adjustable delivery volume rotary pump, including: first and second housing structures; a delivery chamber comprising a first chamber wall formed by the first housing structure, a second chamber wall formed by the second housing structure, a fluid inlet in a low-pressure region and a fluid outlet in a high pressure region; a pump wheel rotatable about a rotational axis in the delivery chamber; and a pressing device for generating pressing force. The second housing structure can be moved relative to the first housing structure from a first to a second position, against the pressing force. In the second position, a gap exists between the first and the second chamber walls and fluid can escape from the delivery chamber by bypassing the inlet and the outlet, or a circulation of the fluid which reduces the delivery rate of the rotary pump arises in the gap within the delivery chamber.

Abstract: A gear machine includes two externally intermeshing gear wheels enclosed by a housing that has a high-pressure connection and a low-pressure connection situated opposite one another. On an inner circumferential face of the housing, a notional boundary line is assigned to both gear wheels. The line runs parallel to the line of contact between the gear tooth tips of the gear wheels and the inner circumferential face. The intersection edge is located between the two boundary lines and the minimum distance between the intersection edge and the boundary lines are at least one pitch interval of the gear wheels. The cross sectional shape of the low-pressure connection deviates from the circular shape such that its cross sectional area overlapping the gear wheels is greater than the cross sectional area of a notional, circular low-pressure connection overlapping the gear wheels at the same minimum distance from the boundary lines.

Abstract: A gear pump device of this disclosure includes: a gear pump; a casing; and a seal mechanism, wherein the seal mechanism includes: an annular rubber member; an outer member; and an inner member, which has an outer peripheral wall on which the annular rubber member is mounted, the inner member fitted into an inner side of the outer member and contacting on an inner wall face of the outer shell, wherein the outer peripheral wall of the inner member is provided with a collar portion that generates a propulsive force towards the inner wall face of the outer shell of the casing by a contact pressure of the annular rubber member based on a discharge pressure of the gear pump, and the collar portion forms a pressure receiving face to increase the propulsive force as the contact pressure of the annular rubber member increases according to an increase of the discharge pressure.

Abstract: An internal gear pump includes a ring gear and a pinion configured to mesh with the ring gear. The ring gear and pinion delimit a pump chamber extending from a suction region to a pressure region. The internal gear pump also includes an axial disk arranged on front faces of the ring gear and the pinion and includes a lubricant feed from the suction region between the axial disk and the ring gear and pinion. The lubricant feed includes a lubricant channel which passes through the axial disk. A wedge gap is delimited between the axial disk and the ring gear and pinion. The wedge gap communicates with the suction region and, when the ring gear and the pinion are driven in rotation, a lubricating film forms between the axial disk and the ring gear and pinion.

Abstract: An improved positive displacement pump provides improved wear characteristics. Specifically, rotor pads are provided on faces relative to an internal portion of the rotor housing as it relates to an end wall and a rear side of a cover plate. The rotor pads preferably have at least one of anti-galling and/or anti-friction or anti-wear characteristics thereby providing improvements over the prior art. A central member is preferably provided so that pad replacement may be relatively easily performed in the field in clean in place operations.

Abstract: An input shaft assembly is movable along an axis to absorb external impact loads. A biasing member exerts an axial load in a direction counter to potential impact loads. A stop is provided to control the application of biasing loads to control application of such axial load.

Abstract: Embodiments of an oil pump for an engine have an increased pump capacity while maintaining or marginally increasing the overall physical size of the pump. In some embodiments, this increased capacity is reflected in a pump length efficiency ratio, which compares an effective gear length (LG) of first and second pump gears used in the oil pump, to an effective housing length (LH). The effective housing length (LH) is a longitudinal distance between surfaces on opposite ends of the oil pump that must be maintained for the oil pump to fit into an available space. Accordingly, the pump length efficiency ratio indicates how much of the effective housing length (LH) can be occupied by the gears. Alternatively, the pump capacity is measured using an output flow efficiency ratio, which compares a theoretical pump flow (FP) at a given gear speed (SG) to the effective housing length (LH) of the pump.

Abstract: A fluid device includes a displacement assembly and a balance plate assembly disposed adjacent to the displacement assembly. The displacement assembly includes a ring and a rotor disposed in a bore of the ring. The ring and rotor cooperatively define a plurality of volume chambers. The balance plate assembly includes a housing that defines a cavity. A balance plate is disposed in the cavity. The balance plate includes a first end surface and an oppositely disposed second end surface. The balance plate is adapted to move axially between a first position in which the second end surface of balance plate abuts a first end face of the ring to a second position in which the second surface of the balance plate is recessed in the cavity.

Abstract: A coupling shaft assembly includes a coupling shaft with a first radial shoulder and a second radial shoulder, the first radial shoulder and the second radial shoulder each include at least one slot to provide a lubricant flow path.

Abstract: A fluid transfer engine employs a case with a cylindrical inner wall having an operating radius extending from a case axis. A main rotor is carried within the case and incorporates a lobe with a major radius equal to and concentric with the operating radius of the case, the main rotor having a minor radius defining a body. Two peripheral rotors are diametrically opposed with respect to the case axis and rotate within rotor chambers extending from the case. Each peripheral rotor has a radius equal to the minor radius and a center of rotation located at twice the minor radius from the case axis. Each of the peripheral rotors rotates in uniform circular motion with the main rotor in sealing contact with the body and incorporates a sculpted recess for receiving the lobe of the main rotor.

Abstract: A hydraulic motor having a cooling system includes a stator, a rotor that rotates and orbits in the stator, a drive link connected to the rotor, and a housing connected with the stator. The housing includes a working fluid inlet port, a working fluid outlet port, a cooling fluid inlet port, and a cooling fluid outlet port. Each port extends through the housing and is configured to connect with a different associated external fluid line. Pressurized fluid enters the working fluid inlet port to rotate and orbit the rotor en route to the working fluid outlet port. The cooling fluid ports are isolated from the working fluid inlet port and the working fluid outlet port within the housing.

Abstract: A housing includes a pump chamber, which rotatably receives an inner rotor and an outer rotor that define a pressure chamber therebetween. An inlet port of the housing is communicated with the pressure chamber to supply fluid into the pressure chamber. An outlet port of the housing is communicated with the pressure chamber to discharge the fluid from the pressure chamber. An axial size of an axial clearance, which is formed between an axial end surface of the pump chamber and an axial end surface of the inner rotor, differs from an axial size of an axial clearance, which is formed between the axial end surface of the pump chamber and an axial end surface of the outer rotor.

Abstract: A gear pump includes a gear to be driven by a drive shaft, a pair of side plate members adjoining side surfaces of the gear, respectively, to restrain leakage of an operating fluid, and a tip seal member or seal block for sealing the gear tip or circumference of the gear. At least one of the side plate members and the tip seal member are integral parts of a sealing member.

Abstract: A rotary engine has a cycloid rotor and a sealing grid including a face seal that rotates with the rotor, and including other seals that do not rotate with the rotor. As the rotor rotates within a housing, the rotor, housing and seal grid form at least one working chamber between them, the chamber undergoing a change from initial volume V1 to V2, which is less than V1, thus compressing a working medium, and subsequently expanding to volume V3, which may be larger than V1, such that the chamber volume is a smooth and continuous function of rotor's rotational angle.

Abstract: The present invention provides a dry pump including: a center cylinder which includes: a plurality of pump chambers containing an upper stage pump chamber that communicates with an intake port and a lower stage pump chamber that communicates with a discharge port; a plurality of rotors contained in the plurality of the pump chambers; a rotating shaft that is a rotation axis of the rotor; and a side face on which a communication hole is formed, the side face being intersected by the rotating shaft extending in the axial direction, and being provided adjacent to the lower stage pump chamber, and a side cover which covers the side face with the communication hole to form a space.

Abstract: A rotary fluid pressure device includes a gerotor gear set having a ring gear and a star gear orbitally moveable about a longitudinal axis relative to the ring gear. The star gear includes an annular spacer ring disposed at one end of the star gear. A brake pin is moveable along the longitudinal axis into and out of interlocking engagement with the annular spacer ring. The brake pin includes an outer surface for engaging an interior surface of the spacer ring. The outer surface of the brake pin and the interior surface of the spacer ring are each angled relative to the longitudinal axis to engage each other in a tapered engagement, to generate an axial force along the longitudinal axis to move the brake pin out of engagement with the star gear in response to a torque being applied to the star gear.

Abstract: A hydraulic motor receives pressurized fluid from a source controlled by a human operator to convert the energy in the hydraulic fluid to a rotational output to propel a drive wheel of a machine. The hydraulic motor includes an end cover, a manifold, a drive assembly, a wear plate, a housing, and an output assembly. The drive assembly includes a rotor with external teeth and a stator with internal teeth formed by rollers having end faces. The pressurized fluid from the source flows through the manifold to the drive assembly and causes rotational and orbital movement of the rotor relative to the stator. The rotational movement of the rotor is transmitted to the drive wheel by the output assembly. A first set of anti-cogging passages and a second set of anti-cogging passages communicate fluid pressure to the end faces in timed relationship to reduce cogging or detenting of the rotational output of the motor.

Abstract: In an inner wall surface of a casing, grooves are formed that correspond to end faces of an outer rotor and an inner rotor, and seal members are disposed within the grooves, the seal members presses against the end faces of the outer rotor and the inner rotor. Inclined portions are provided in sealing portions of resin members of seal members, the sealing portions covering a closed portion. With this configuration, an internal pressure in the closed portion causes the inclined portions to separate from an outer rotor and an inner rotor when a brake fluid pressure within the closed portion increases to the point that the brake fluid is excessively compressed, releasing the brake fluid that is inside the closed portion. It is therefore possible to prevent the brake fluid pressure from increasing excessively within the closed portion.

Abstract: The invention relates to a gear pump, especially for a power steering system, having a housing, a first cover and a second cover, the first cover being integrated into the housing.

Abstract: A vane type vacuum pump 1 is provided in the vicinity of an air intake passage 11 for sucking the air into a pump chamber 2, and communicates a space A on the front side and a space B on the back side of the rotational direction of the vane at the time of the reverse rotation of the vane 6, and includes an escaping groove 21 for allowing a lubricating oil to escape into the space B on the back side from the space A on the front side.

Abstract: A hydraulic motor having a cooling system includes a stator, a rotor that rotates and orbits in the stator, a drive link connected to the rotor, and a housing connected with the stator. The housing includes a working fluid inlet port, a working fluid outlet port, a cooling fluid inlet port, and a cooling fluid outlet port. Each port extends through the housing and is configured to connect with a different associated external fluid line. Pressurized fluid enters the working fluid inlet port to rotate and orbit the rotor en route to the working fluid outlet port. The cooling fluid ports are isolated from the working fluid inlet port and the working fluid outlet port within the housing.

Abstract: A seal apparatus includes at least one pair of gears; a side plate arranged adjacent to the pair of gears; and a housing sandwiching the side plate. At least one of the side plate and the housing includes a shoulder portion. The seal apparatus further includes a seal member arranged between the housing and the side plate and arranged at the shoulder portion. The seal member separates a low pressure area from a high pressure area in a radial direction of the gear. The shoulder portion is located in the low pressure area. At least a part of the seal member faces the high pressure area. The seal apparatus further includes a backup member reinforcing the seal member and facing a tip portion of the shoulder portion; and a containing portion formed between a root portion of the shoulder portion and the seal member to be capable of containing a part of the seal member at least when the seal member is elastically deformed.

Abstract: An external gear pump which has a certain flow rate or volumetric capacity at a given speed can be taken apart and the parts rearranged and assembled into a second pump operating at the same speed with a flow rate or volumetric capacity that is different from the original pump. No new parts are required for the second pump configuration and all original parts are used. With this structure, pumps with different flow rates can be built using fewer parts than conventional designs.

Abstract: In screw compressors for extremely high discharge pressures, the geometrical centers of all coaxial holes or housing bores are all located in one single housing section on the male rotor side at a certain first straight line and the geometrical centers of all coaxial holes or housing bores are all located in one single housing section on the female rotor side at a certain second straight line. The diameter of all coaxial holes in the housing on the male rotor side, and the diameters of all coaxial holes in the housing on the female rotor side, decrease from the open to the closed end of the housing section. Based on this construction, the bearings and the components adjacent to the bearings are guided at their periphery in one single housing section so that there will be no coaxial deviations caused by assembly and no coaxial deviations in long term operation.

Abstract: An interlocking device for rigidly holding together the body and flange of a hydraulic machine includes a body, flange, gears, sealing elements acting as a body seal and lobe seal adapted to effectively seal pressurized oil pockets within the hydraulic machine with a back-up ring that prevents squeezing of the lobe seal and to retain it in its original position, appropriately dimensioned bush bearings adapted to act as load bearing journals. The interlocking device includes a plurality of bean-shaped dowels located at both inlet and outlet sides that hold the body and flange together with minimum relative displacement to ensure high volumetric efficiency of the hydraulic machine even at high operating pressures in excess of 275 bar or higher.