EP4314560A1 - Innenzahnradfluidmaschine sowie verfahren zum herstellen einer innenzahnradfluidmaschine - Google Patents
Innenzahnradfluidmaschine sowie verfahren zum herstellen einer innenzahnradfluidmaschineInfo
- Publication number
- EP4314560A1 EP4314560A1 EP22719811.6A EP22719811A EP4314560A1 EP 4314560 A1 EP4314560 A1 EP 4314560A1 EP 22719811 A EP22719811 A EP 22719811A EP 4314560 A1 EP4314560 A1 EP 4314560A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- intermediate piece
- retaining pin
- internal gear
- fluid machine
- housing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
- F04C2/101—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with a crescent-shaped filler element, located between the inner and outer intermeshing members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
- F04C15/0003—Sealing arrangements in rotary-piston machines or pumps
- F04C15/0007—Radial sealings for working fluid
- F04C15/0019—Radial sealing elements specially adapted for intermeshing-engagement type machines or pumps, e.g. gear machines or pumps
Definitions
- the invention relates to an internal gear fluid machine, with a first gear wheel having external teeth and mounted rotatably about a first axis of rotation, and a second gear wheel having internal teeth meshing with the external teeth in a region of engagement region and mounted rotatably about a second axis of rotation different from the first axis of rotation, wherein between a filler piece is arranged on the first gear wheel and the second gear wheel away from the engagement area, which rests on the one hand on the external toothing and on the other hand on the internal toothing in order to divide a fluid space present between the first gear wheel and the second gear wheel into a first fluid chamber and a second fluid chamber, and wherein housing walls of a machine housing of the internal gear fluid machine are arranged on both sides of the first gear wheel and the second gear wheel in the axial direction with respect to the first axis of rotation and the filler piece is attached to at least one by means of at least one he holding pin engaging the housing walls is mounted on the machine housing.
- the publication DE 199 30 911 CI for example, is known from the prior art.
- This describes an internal gear fluid machine for reverse operation in a closed circuit; with an externally toothed pinion; with an internally toothed ring gear that meshes with the pinion, with a housing, with a filling that fills the crescent-shaped space between the pinion and ring gear; the filling comprises two identical filling pieces; a stop pin is provided which is mounted in the housing and against which the filler pieces are supported with their end faces.
- axial washers are provided on both sides of the pinion.
- An axial pressure field is provided between the outside of each axial disk and the relevant housing wall, and a control field is provided between the inside of each axial disk and the pinion. At least one control slot is connected to the control panel, which tapers towards its free end.
- the document DE 10 2008 053 318 A1 discloses a reversibly operable gearwheel machine, comprising a housing in which two gearwheels are arranged.
- a first storage chamber and a second storage chamber are provided, wherein in a first Operating direction of the gear machine, the first bearing chamber and in an opposite second operating direction, the second bearing chamber is acted upon by a hydraulic fluid pressure and forms a hydrostatic bearing for a gear.
- a vehicle steering system comprising a hydraulic circuit, a hydraulic cylinder and a gear machine that works as a pump and in its first operating direction applies hydraulic pressure to a first working chamber and in its second operating direction to a second working chamber of the hydraulic cylinder.
- the object of the invention is to propose an internal gear fluid machine which has advantages over known internal gear fluid machines, in particular has a longer service life or higher fatigue strength and can also continue to be produced inexpensively.
- the retaining pin is rotatably mounted on the housing wall via at least one intermediate piece, the housing wall being made of a housing wall material and the intermediate piece being made of an intermediate piece material that is different from the housing wall material.
- the internal gear fluid machine represents in particular a fluid delivery device and is used in this respect to deliver a fluid, for example a liquid or a gas.
- the internal gear fluid machine has two gears, namely the first gear and the second gear.
- the first gear wheel can also be referred to as a pinion and the second gear wheel can also be referred to as a ring gear.
- the pinion has the external teeth and the ring gear has the internal teeth. Viewed in the circumferential direction, the external toothing and the internal toothing engage in one another in regions, ie mesh with one another in regions, namely in the engagement region.
- the two gear wheels are provided for fluid delivery and for this reason are designed in such a way that they interact during a rotary movement for delivering the fluid and thereby engage with one another or mesh with one another.
- the first gear is preferably coupled to a machine shaft or drive shaft of the internal gear fluid machine, preferably rigidly on the one hand and/or on the other detachable or permanent.
- the coupling can therefore be rigid on the one hand.
- it is designed to be either detachable or permanent.
- detachable coupling there is, for example, a plug-in pinion that is pushed onto the drive shaft and can be detached from it without being damaged.
- the pinion preferably has an internal toothing which interacts with an external toothing of the machine shaft for drivingly coupling the pinion to the machine shaft.
- the first gear wheel is rotatably mounted in a machine housing of the internal gear fluid machine by means of the machine shaft.
- the first gear wheel is preferably arranged on the machine shaft so that it always has the same speed as the machine shaft during operation of the internal gear fluid machine.
- Both the first gear wheel and the second gear wheel are arranged in the machine housing and are rotatably mounted therein.
- the first gear wheel is mounted such that it can rotate about the first axis of rotation
- the second gear wheel is mounted so that it can rotate about the second axis of rotation.
- the first axis of rotation can also be referred to as the axis of rotation of the pinion and the second axis of rotation as the axis of rotation of the ring gear. Seen in cross section, i.e.
- the first gear wheel is arranged in the second gear wheel in such a way that the external toothing of the first gear wheel meshes with the internal toothing of the second gear wheel in the meshing area or is in engagement with it.
- the engagement area is fixed to the housing, for example, so it does not rotate with the first gear wheel or the second gear wheel.
- a tooth of one of the toothings engages in a tooth gap of the respective other toothing.
- the space between the teeth is delimited in the circumferential direction by the teeth of the respective toothing.
- a tooth of the internal toothing engages in a tooth space of the external toothing or, conversely, a tooth of the external toothing engages in a tooth space of the internal toothing.
- the internal toothing and the external toothing work together in a sealing manner.
- the filler piece is arranged on the other side of the engagement area, ie preferably on the side diametrically opposite the engagement area with respect to the first axis of rotation and/or the second axis of rotation.
- the filler piece is present between the first gear wheel and the second gear wheel or, to put it another way, between the external toothing of the first gear wheel and the internal toothing of the second gear wheel.
- the filler piece is therefore arranged in a fluid space, which is delimited in the radial direction inwards by the first gear wheel and in the radial direction outwards by the second gear wheel with respect to the first axis of rotation and the second axis of rotation, respectively.
- the filler piece rests on the one hand on the external toothing and on the other hand on the internal toothing. To put it more precisely, the filling piece rests in a sealing manner on tooth tips of the external toothing and in a sealing manner on tooth tips of the internal toothing in order to divide the fluid space into the first fluid chamber and the second fluid chamber. Viewed in the circumferential direction, each of the two fluid chambers is therefore delimited on the one hand by the filling piece and on the other hand by the tight meshing of the external toothing and the internal toothing in the engagement area.
- one of the fluid chambers serves as a suction chamber and the respective other of the fluid chambers serves as a pressure chamber.
- the suction chamber can also be referred to as the inlet chamber and the pressure chamber as the outlet chamber; it is crucial that the fluid is always conveyed from the inlet chamber in the direction of the outlet chamber during the operation of the internal gear fluid machine.
- the pressure in the inlet chamber is always lower than the pressure in the outlet chamber.
- the pressure in the entry chamber can already be (significantly) greater than an ambient pressure. For example, pressurized fluid is conveyed from the inlet chamber toward the outlet chamber with the aid of the internal gear fluid machine.
- the internal gear fluid machine is in the form of a motor, or is operated as a motor, fluid is supplied to the pressure chamber and enters the suction chamber, causing the gear wheels to rotate.
- the pressure chamber is the inlet chamber and the suction chamber is the outlet chamber; the pressure present in the inlet chamber is higher than the pressure in the outlet chamber.
- the suction chamber can also be referred to as a low-pressure chamber and the pressure chamber can also be referred to as a high-pressure chamber.
- the suction side of the internal gear fluid machine corresponds to a low-pressure side and the pressure side to a high-pressure side.
- the terms "low pressure” and "high pressure” are not to be understood as meaning a restriction to a specific pressure level; Rather, the pressure in the high-pressure chamber or on the high-pressure side is only relatively higher than the pressure in the low-pressure chamber or on the low-pressure side.
- the filling piece is preferably designed in several parts and in this respect has several segments.
- the segments of the filler piece are arranged side by side in the radial direction, so that a first segment is arranged on the side of a second segment facing the first gear wheel and vice versa the second segment is arranged on the side of the first segment facing the second gear wheel.
- the first segment is in sealing contact with the first gear wheel or its external toothing and the second segment is in contact with the second gear wheel or the internal toothing of the second gear wheel.
- the two segments can preferably be displaced relative to one another in the radial direction.
- a gap present between them is subjected to fluid pressure during operation of the internal gear fluid machine in such a way that the first segment is pushed in the direction of the first gear wheel and the second segment is pushed in the direction of the second gear wheel, so that the segments on the respective gear wheel or the tooth tips of the corresponding toothing.
- the internal gear fluid machine is thus radially compensated or gap-compensated in the radial direction.
- Each of the segments can be further subdivided into segments.
- the first segment is in one piece or consists of at least two sub-segments and/or the second segment is in one piece and consists of at least two segments.
- These segments of the filling piece are also preferably mounted such that they can be displaced relative to one another, ie they can be displaced independently of one another. This achieves a particularly effective gap compensation.
- these further segments are preferably arranged next to one another in the circumferential direction.
- the further segments in this case have the same extension in the circumferential direction and/or are embodied symmetrically to one another.
- Such a design enables bidirectional operation of the internal gear fluid machine, ie any direction of rotation.
- the internal gear fluid machine is insofar not fixed to a specific direction of rotation, but the direction of rotation can be changed during operation of the internal gear fluid machine.
- Such an internal gear fluid machine can also be referred to as a four-segment internal gear fluid machine because of the four segments that are then preferably present.
- provision can also be made for bidirectional operation of the internal gear fluid machine to be implemented without radial gap compensation.
- the two segments are preferably located next to one another in the circumferential direction and are each configured in one piece. It is also possible for the entire filling piece to be in one piece.
- the internal gear fluid machine has the machine case.
- the two gears of the internal gear fluid machine are arranged between housing walls of the machine housing, namely viewed in the axial direction with respect to one of the axes of rotation.
- One of the housing walls is therefore on a first side of the gears and a second of the housing walls is on a second side of the gears opposite the first side in the axial direction, so that the housing walls receive the gears between them as seen in the axial direction.
- a gap remaining between the housing walls and the gearwheels is dimensioned so small that the housing walls bring about an adequate sealing of the fluid space or the fluid chambers.
- the gears are mounted on and/or in the machine housing.
- the housing walls are connected to one another, for example, via a base body of the machine housing, with the base body at least partially, but preferably completely, enclosing the two gear wheels in the circumferential direction. Provision can be made for at least one of the housing walls and the base body to be designed in one piece and with the same material.
- the base body and the respective housing wall together represent a pot-like element, the interior of which is closed with the respective other housing wall.
- At least one of the housing walls has an opening for the machine shaft of the internal gear fluid machine, with which the first gear and/or the second gear are drivingly coupled. If such a recess is provided in only one of the housing walls, then the respective other of the housing walls is designed to be continuous and uninterrupted, so that it seals off the interior space in a fluid-tight manner. Alternatively, however, it can also be provided that the machine shaft extends through both housing walls, so that a corresponding recess is formed in each of the housing walls.
- Such a configuration of the internal gear fluid machine makes it possible, for example, to couple a drive machine to the machine shaft on the one hand of the machine housing in terms of drive technology and, on the other hand, to connect another device, in particular another internal gear fluid machine, to the machine shaft.
- the further device can be driven by the drive device via the internal gear fluid machine or its machine shaft, so that ultimately the internal gear fluid machine and the further device are driven jointly by the drive device.
- the filler piece is also arranged in the machine housing and is preferably mostly present in the base element. Viewed in the axial direction, it is mounted on both sides of the machine housing, in particular movably or rotatably mounted.
- the rotatable bearing enables the position of the filler piece to be adjusted to the current operating state of the internal gear fluid machine and also to compensate for wear that occurs over time during the operation of the internal gear fluid machine.
- the at least one retaining pin which acts on at least one of the housing walls, is used to mount the filler piece.
- the filling piece is only supported on the retaining pin, in particular in the circumferential direction, ie in principle not rigidly attached to the retaining pin, but is movable relative to it.
- the retaining pin has a support surface for this purpose, in particular a continuously flat support surface, on which the filler piece is supported via a counter-support surface of the filler piece.
- the support takes place in particular over the entire surface. This means that the entire support surface is in contact with the counter-support surface, particularly preferably in continuous contact with the entire counter-support surface.
- the filler piece can also be rigidly fastened to the retaining pin, in particular can be designed with it in a form-fitting and/or material-to-material manner or in one piece and/or of the same material.
- the retaining pin engages directly in a retaining pin receptacle of the machine housing, which is formed in one of the housing walls, or acts directly on the housing wall.
- the retaining pin is preferably rotatably mounted in the retaining pin receptacle, so that the displaceability of the filling piece is ensured.
- the aim is to use the internal gear fluid machine for higher speeds, higher pressures and higher speed and pressure gradients or generally for higher performance and to upgrade it accordingly.
- the machine housing is partially made of a material that has a sufficiently high strength.
- the retaining pin does not act directly on the housing wall, but is rotatably mounted on it via the at least one intermediate piece.
- the retaining pin--at least in certain areas or alternatively completely--does not engage directly, but only indirectly via the intermediate piece on the housing wall.
- the housing wall consists of the housing wall material and the intermediate piece consists of the intermediate piece material that is different from the housing wall material.
- the intermediate piece material is selected in such a way that it withstands the loads exerted by the retaining pin on the intermediate piece permanently or over the entire intended service life of the internal gear fluid machine.
- the retaining pin consists of a retaining pin material
- the housing wall consists of the housing wall material
- the intermediate piece consists of the intermediate piece material. Provision can be made for the intermediate piece material to be the same as the retaining pin material. In each case, however, the housing wall material is different from the spacer material.
- the intermediate piece is also arranged on the housing wall in such a way that the forces applied by the retaining pin to the intermediate piece are introduced into the housing wall reliably and without damaging the housing wall.
- the forces exerted by the retaining pin are distributed and introduced more evenly into the housing wall than would be possible with the retaining pin acting directly on the housing wall.
- a further development of the invention provides that in addition to the retaining pin there is a further retaining pin, by means of which the filling piece is mounted on one of the further housing walls opposite the housing wall, the further retaining pin being rotatably mounted on the further housing wall via at least one further intermediate piece.
- the filler piece is therefore rotatably mounted on the machine housing not only by means of the retaining pin, but by means of a plurality of retaining pins.
- the retaining pin and the further retaining pin are located on opposite sides of the filler piece in the axial direction with respect to one of the axes of rotation or engage on opposite sides of the latter.
- the filler piece is rotatably mounted on the housing wall via the retaining pin and on the further housing wall via the further retaining pin, preferably about a common axis of rotation.
- a development of the invention provides that the retaining pin is rotatably mounted both on the housing wall and on the further housing wall by means of the intermediate piece and the further intermediate piece.
- the retaining pin extends from the intermediate piece to the further intermediate piece and is rotatably mounted on opposite sides on the housing wall and the further housing wall. It is provided that the retaining pin extends from the intermediate piece to the wide intermediate piece.
- a development of the invention provides that a retaining pin material of the retaining pin has a greater or at least the same value of a material parameter as the intermediate piece material and/or that the intermediate piece material has a greater value of the material parameter than the housing wall material.
- a material parameter for example, the modulus of elasticity, the tensile strength, the yield point, the 0.2% yield point or the elastic limit are used as material parameters.
- the value of the material parameter means the value for the respective material. It is therefore provided, for example, that the holding pin material has a greater or at least the same modulus of elasticity as the intermediate piece material, it being possible, of course, to use one of the other material parameters instead of the modulus of elasticity.
- the modulus of elasticity of the intermediate piece material is greater than the modulus of elasticity of the housing wall material, with any of the other material parameters being able to be used here instead of the modulus of elasticity.
- the housing wall material is aluminum or an aluminum alloy and/or the intermediate piece material is tempered steel, in particular nitrided steel, and/or the holding pin material is steel.
- a light metal should be used as the housing wall material, namely aluminum or an aluminum alloy.
- this housing wall material usually has a value of the material parameter which is not sufficient to enable reliable operation of the internal gear fluid machine at high power if the retaining pin acts directly on the housing wall.
- the intermediate piece is used.
- This consists preferably of a high-strength material, namely heat-treated steel.
- Nitriding steel is particularly preferably used as heat-treatable steel, for example nitrated or non-nitrated nitrated steel.
- a development of the invention provides that the retaining pin engages in a retaining pin receptacle of the intermediate piece and the intermediate piece engages in an intermediate piece receptacle in the housing wall.
- the adapter receptacle is in the form of a depression formed in the housing wall.
- the intermediate piece receptacle extends only partially through the housing wall and is delimited by a base in the direction facing away from the gears in the axial direction.
- the intermediate piece is arranged in the intermediate piece receptacle.
- the adapter in turn has the retaining pin receptacle in which the retaining pin is partially arranged. For example, provision is made for the retaining pin to protrude in the axial direction into the intermediate piece receptacle and to this extent to be partially arranged in it.
- the intermediate piece is preferably received completely in the intermediate piece receptacle, ie it does not protrude from the intermediate piece receptacle.
- the intermediate piece protrudes beyond the intermediate piece receptacle in order to provide particularly reliable protection for the housing wall from the forces acting on the retaining pin.
- the intermediate piece protrudes beyond the intermediate piece receptacle and the retaining pin receptacle is arranged or configured on or in the intermediate piece in such a way that the retaining pin is completely outside the intermediate piece receptacle.
- the intermediate piece holds the retaining pin to this extent outside of the intermediate piece receptacle and at a corresponding distance from the housing wall.
- a development of the invention provides that a retaining pin radial play between the retaining pin and an inner wall of the intermediate piece delimiting the retaining pin receptacle is different from an intermediate part radial play between an outer wall of the intermediate piece and the housing wall delimiting the intermediate piece receptacle.
- the retaining pin radial play and the adapter radial play exist when the retaining pin is arranged in the retaining pin receptacle and when the adapter is arranged in the adapter receptacle.
- the retaining pin radial play describes a play of the retaining pin in the retaining pin receptacle in the radial direction; the intermediate piece radial play describes a play of the intermediate piece in the intermediate piece receptacle, also in the radial direction.
- the retaining pin radial play and the adapter radial play are different from each other. Provision can be made here for one of the radial clearances to be equal to zero, so that the respective element is held rigidly in the corresponding receptacle.
- the intermediate piece is preferably arranged immovably, ie without radial play between the intermediate pieces, in the intermediate piece receptacle and is correspondingly held on the housing wall.
- the retaining pin radial play is greater than zero, so that the retaining pin is present with play in the retaining pin receptacle.
- the retaining pin radial play is selected, for example, in such a way that it allows a rotational movement of the retaining pin in the retaining pin receptacle about a retaining pin axis of rotation.
- the retaining pin radial play preferably corresponds to an arrangement of the retaining pin in the adapter with an H7 fit.
- the retaining pin is rigidly connected to the intermediate piece, ie is arranged immovably in the retaining pin receptacle.
- the retaining pin radial play is equal to zero, whereas the intermediate piece radial play is greater than zero, so that the intermediate piece is movably, in particular rotatably, arranged in the intermediate piece receptacle.
- both the retaining pin material play and the intermediate piece radial play to be greater than zero, so that both the retaining pin in the retaining pin receptacle and the intermediate piece in the intermediate piece receptacle are arranged with play. In any case, the advantages already mentioned can easily be achieved.
- the retaining pin radial play is at least 0.02 mm and/or at most 0.06 mm and/or that the intermediate piece is fastened to the housing wall without play.
- the holding pin radial play is therefore at least 0.02 mm, preferably more than 0.02 mm.
- the retaining pin radial play in particular at least 0.03 mm or be at least 0.04 mm.
- the retaining pin radial play is at most 0.06 mm or less than 0.06 mm.
- the retaining pin radial play is at most 0.05 mm or at most 0.04 mm.
- the intermediate piece is a hollow-cylindrical bearing bush or a rolled sheet metal part.
- the intermediate piece is preferably in the form of a hollow cylinder, particularly preferably in the form of a hollow circular cylinder.
- a conventional bearing bush for example, such as can also be used in a sliding bearing, is used as the intermediate piece. This is particularly the case if the internal gear fluid machine is designed for only light loads.
- the bearing bush can, for example, consist entirely and continuously of bronze, sintered bronze, steel or plastic, or have at least one of these materials.
- the bearing bush can also be made of a composite material.
- the intermediate piece is in the form of a rolled sheet metal part, ie it is produced by rolling.
- an initially flat metal sheet is processed in such a way that two end edges of the metal sheet that previously faced away from one another are now opposite one another and to this extent enclose a gap between them.
- the gap is preferably as small as possible, in particular it is dimensioned in such a way that the end edges are at a distance from one another of at most 0.05 mm or less.
- the end edges are particularly preferably in direct contact with one another, so that the gap does not exist or has dimensions of zero.
- the two end edges of the sheet metal are preferably aligned with one another after rolling. To this extent, the end edges are arranged in abutment with one another after rolling.
- the intermediate piece is in several parts, in particular as a divided bearing bush.
- the intermediate piece is composed of several elements, which are initially separate from one another and are subsequently fastened to one another, for example in a force-fitting, form-fitting and/or cohesive manner.
- the several parts of the intermediate piece are fixed in relation to one another solely by the arrangement of the intermediate piece in the intermediate piece receptacle and/or the arrangement of the retaining pin in the retaining pin receptacle, i.e. initially inserted loosely and separately from one another in the intermediate piece receptacle. This is particularly the case if the intermediate piece is a split bearing bush.
- the intermediate piece is divided evenly, that is to say it is composed of two parts of the same size, which have the same extensions, in particular in the circumferential direction.
- Such a configuration of the intermediate piece also serves primarily for cost-effective production of the internal gear fluid machine.
- a further development of the invention provides that the intermediate piece is fastened to the housing wall in a rotationally fixed manner, in particular in a non-positive and/or positive manner.
- the non-rotatable attachment of the intermediate piece to the housing wall prevents the intermediate piece from moving in the intermediate piece receptacle and thus ensures that the loading of the intermediate piece by the retaining pin is constant. It is particularly preferably fastened in a non-positive manner, for example by pressing the intermediate piece into the intermediate piece receptacle, and/or in a form-fitting manner.
- the intermediate piece has in particular a form-fitting device which interacts in a form-fitting manner with a form-fitting counterpart device of the housing wall in order to hold the intermediate piece in a rotationally fixed manner on the housing wall.
- the form-fitting device is, for example, in the form of a form-fitting projection and the form-fitting counter-device as receiving the form-fitting projection
- the non-rotatable attachment of the intermediate piece to the housing wall is particularly useful if the intermediate piece is in several parts or is present as a rolled sheet metal part. In these cases, the locking prevents the retaining pin from exerting force on a gap present between the parts of the bearing bush or the gap remaining after rolling. This effectively prevents damage to the intermediate piece and consequently to the internal gear fluid machine.
- a further development of the invention provides that the retaining pin extends completely through the intermediate piece and rests against a bottom of the intermediate piece receptacle on its side facing away from the filling piece.
- the retaining pin extends completely through the intermediate piece in the axial direction. It has the projection, which has smaller dimensions in the radial direction than an area of the retaining pin that adjoins the projection. This means that the retaining pin tapers in the direction facing the ground.
- the dimensions of the projection in the radial direction on its side facing the floor are at most 60%, at most 50% or at most 40% of the dimensions of a base body of the retaining pin directly adjoining the projection on its side facing the projection or the largest dimensions of the base body in the radial direction over its entire extent in the axial direction.
- the retaining pin is supported on the floor via the projection. On the one hand, this ensures reliable mounting of the filler piece and, on the other hand, it allows the holding pin to tilt slightly with respect to the intermediate piece within the scope of the holding pin radial play.
- the configuration described permits a compensating movement of the retaining pin and, correspondingly, of the filler piece supported by the retaining pin, which ensures reliable operation of the internal gear fluid machine.
- a development of the invention provides that an opening is formed in the housing wall adjacent to the intermediate piece receptacle, with a web being formed between the intermediate piece receptacle and the opening, which web has a wall thickness of at least 50%, at least 75%, at least 100%, or at least 150% of a wall thickness of the intermediate piece.
- the opening is, for example, in the form of a recess, ie it is delimited by a base on its side facing the gearwheels and correspondingly penetrates only partially through the housing wall in the axial direction.
- the opening represents a pressure field, for example, which is at least partially, but preferably completely, covered by an axial disk of the internal gear fluid machine.
- the pressure field is at least intermittently subjected to a fluid pressure, so that the axial disk is urged in the direction of the gears and, in particular, bears sealingly against them.
- the opening can also be designed as a through-opening and in this respect can penetrate completely through the housing wall in the axial direction.
- the opening is in the form of a fluid line, via which one of the fluid chambers of the internal gear fluid machine is fluidically connected to a fluid connection of the internal gear fluid machine.
- the interface receptacle and opening are separate from the web.
- the web is designed in such a way that it is resistant to forces introduced into the housing wall by the retaining pin. To this end, it has a wall thickness which is at least 50% of the wall thickness of the intermediate piece, but is preferably greater.
- the wall thickness of the web particularly preferably has at least one of the sizes mentioned. This achieves a high fatigue strength of the internal gear fluid machine.
- a development of the invention provides that a ratio between the dimensions of the intermediate piece in the radial direction and the dimensions of the retaining pin in the same direction is at least 110%, at least 120%, or at least 125%.
- the ratio between the outer dimensions of the intermediate piece and the inner dimensions of the intermediate piece is additionally or alternatively at least 110%, at least 120%, or at least 125%.
- the wall thickness of the intermediate piece which is selected depending on the dimensions of the retaining pin in the radial direction. This means that the wall thickness of the intermediate piece is chosen to be greater, the larger the internal gear fluid machine is. This also serves to achieve a high fatigue strength of the internal gear fluid machine.
- the intermediate piece has a coating, in particular a polymer coating, on its inner wall which rests at least in places and/or at least temporarily on the retaining pin, and/or that the intermediate piece is heat-treated at least in certain areas.
- the coating is part of the inner wall, the coating being present on the side of the inner wall facing the retaining pin.
- the coating is preferably a polymeric coating, particularly a polytetrafluoroethylene coating. In this way, a particularly low-friction displacement of the filling piece can be ensured.
- the intermediate piece is heat-treated at least in certain areas. In any case, the heat treatment is particularly preferably carried out for the inner wall.
- the heat treatment is aimed at hardening the intermediate piece and in particular the inner wall, so that the forces exerted by the retaining pin on the intermediate piece cannot cause any damage to the intermediate piece.
- a particularly high fatigue strength of the internal gear fluid machine is achieved.
- a development of the invention provides that the inner wall of the intermediate piece has a surface structure formed in particular by honing or long-stroke honing.
- the surface structure is used to produce improved gliding ability of the retaining pin with respect to the intermediate piece.
- the surface structure is designed, for example, in the manner of the surface structure of a cylinder liner.
- the surface structure is preferably implemented in such a way that a rotary movement of the retaining pin with respect to the intermediate piece exerts a conveying effect on a fluid, in particular conveying the fluid present in the internal gear fluid machine between the inner wall and the retaining pin. to achieve a particularly good lubricating effect.
- the surface structure is preferably produced by honing or long-stroke honing in a manner that is known in principle.
- the intermediate piece has at least one fluid guiding groove, in particular a fluid guiding groove with an open edge in the inner wall.
- the fluid guide groove allows a fluid to flow between the adapter and the retaining pin arranged in the adapter.
- the fluid guiding groove preferably extends over the entire extension of the intermediate piece in the axial direction. For example, impurities that have accumulated between the intermediate piece and the retaining pin can be discharged in the direction of other areas of the internal gear fluid machine through the fluid guiding groove. This improves the durability of the internal gear fluid machine.
- a development of the invention provides that the retaining pin is rotatably mounted in the intermediate piece by means of a hydrostatic bearing, in particular by means of a hydrostatic bearing that is produced by a fluid connection to a pressure field of the internal gear fluid machine.
- the hydrostatic bearing is formed by applying fluid to a fluid space present in the radial direction between the retaining pin and the inner wall of the adapter.
- the fluid space is preferably in fluidic connection with a fluid source.
- the pressure field of the internal gear fluid machine for example, or alternatively one of the fluid spaces, serves as the fluid source.
- the bearing by means of the hydrostatic bearing significantly reduces a frictional force acting between the retaining pin and the intermediate piece, so that in turn the bearing of the retaining pin and thus also the fatigue strength of the internal gear fluid machine are improved.
- the invention also relates to a method for producing an internal gear fluid machine, in particular an internal gear fluid machine according to the statements in the context of this description, wherein the internal gear fluid machine has an external toothing and is mounted rotatably about a first axis of rotation and an internal toothing that meshes with the external toothing in a region of engagement area second gear wheel that is rotatably mounted about a second axis of rotation that differs from the first axis of rotation, with a filler piece being arranged between the first gear wheel and the second gear wheel away from the meshing area, which rests on the one hand on the external toothing and on the other hand on the internal toothing in order to form a gap between the first gear wheel and the second gear wheel into a first fluid chamber and a second fluid chamber, and wherein housing walls of a machine housing of the internal gear fluid machine are arranged on both sides of the first gear wheel and the second gear wheel in the axial direction with respect to the first axis of rotation and the filling piece is attached by means of at least one at
- Figure 1 is a schematic cross-sectional view of an internal gear fluid machine
- FIG. 2 shows a schematic plan view of an area of a machine housing of the internal gear fluid machine in an alternative embodiment
- FIG. 3 shows a schematic longitudinal section through the area of the machine housing.
- FIG. 1 shows a schematic cross-sectional illustration of an internal gear fluid machine 1 which has a machine housing 2 in which a first gear 3 and a second gear 4 are rotatably mounted.
- the first gear 3 can also be referred to as a pinion and the second gear 4 as a ring gear.
- the first gear wheel 3 is mounted in the machine housing 2 so that it can rotate about a first axis of rotation 5 and the second gear wheel 4 can rotate about a second axis of rotation 6 .
- first axis of rotation 5 and the second axis of rotation 6 are arranged parallel to one another at a distance from one another, so that the first gear wheel 3 and the second gear wheel 4 have different axes of rotation.
- the first gear 3 has an external toothing 7 and the second gear 4 has an internal toothing 8 which mesh with one another in an engagement area 9, that is to say are in engagement with one another.
- the first gear 3 and the second gear 4 jointly delimit a fluid space 10.
- the first gear 3 delimits the fluid space 10 in the radial direction inwards and the second gear 4 in the radial direction outwards.
- the fluid space 10 is divided in the circumferential direction into a first fluid chamber 12 and a second fluid chamber 13 by the meshing of the gear wheels 3 and 4 on the one hand and a filler piece 11 on the other hand.
- one of the fluid chambers 12 and 13 is a suction chamber and another of the fluid chambers 12 and 13 is a pressure chamber.
- the filler piece 11 is embodied symmetrically in order to enable reverse operation of the internal gear fluid machine 1 .
- the internal gear fluid machine 1 can be operated in both directions of rotation.
- the filler piece 11 is designed in several parts and has several segments 14 and 15 or 16 and 17.
- the segments 14 and 15 or 16 and 17 are divided in the radial direction.
- the first segment 14 or 16 rests against the first gear wheel 3 and the second segment or 17 rests against the second gear wheel 4 .
- a first patch portion is formed by segments 14 and 15 and a second patch portion is formed by segments 16 and 17.
- the internal gear fluid machine 1 may have only the first shim part, only the second shim part, or both shim parts, for example. In the first two cases, the internal gear fluid machine is correspondingly set to a specific direction of rotation; in the latter embodiment, the already mentioned reversing operation is possible.
- the segments 14 and 15 or 16 and 17 are pushed apart in the radial direction and thus in the direction of the respective gear wheel 3 or 4, so that the respective segment 14, 15, 16 or 17 bears sealingly on the respective gear wheel 3 or 5.
- a radial compensation of the internal gear fluid machine 1 is realized, which can also be referred to as radial gap compensation.
- the second gear wheel 4 is encompassed in the circumferential direction at least in regions, in particular only in regions, by one or more bearing recesses 20 .
- the bearing recesses 20 are fluidically connected to fluid connections (not shown here) of the internal gear fluid machine 1, preferably via a fluid channel 21.
- the flow connections between the respective bearing recess 20 and the fluid connections can be established via a respective connection channel 22 or 23.
- the bearing depressions 20 are connected to the connecting channels 22 and 23 via the fluid channels 21 .
- the bearing recesses 20 are designed in such a way that they are at least temporarily subjected to pressurized fluid, for example from the fluid connections, so that they form a hydrostatic bearing for the second gear wheel 4 .
- one of the bearing recesses 20 is always subjected to the pressure present on the pressure side of the internal gear fluid machine 1, whereas the other of the bearing recesses 20 is subjected to any pressure, for example the pressure present on the suction side, which is lower.
- the Return 24 fluidically connected directly to the suction side or the suction chamber.
- the return 24 is fluidically connected to a fluid tank.
- This fluid tank can be part of the internal gear fluid machine 1, but can also be separate from it.
- it is fluidically connected to the suction side of the internal gear fluid machine 1 .
- the return 24 is arranged between the bearing recesses 20, in the exemplary embodiment shown here in the center or at least approximately in the center with respect to the filler piece 11, preferably exactly in the middle.
- the return 24 is particularly preferably symmetrical with respect to an imaginary plane, which accommodates both the first axis of rotation 5 and the second axis of rotation 6 .
- the return 24 has a return recess 25 which extends through an inner peripheral surface of the machine housing 2 facing the second gear 3 so that the return recess 25 is open in the direction of the gears 3 and 4 .
- the return 24 has return pockets, not shown here, which are preferably in flow connection with the return recess 25 . While the return recess 25 overlaps with the gears 3 and 4 when viewed in the axial direction, the return pockets are on both sides of the gears 3 and 4 when viewed in the axial direction, in particular they are on the side of the sealing discs in the machine housing that faces away from the gears 3 and 4 2 trained.
- the fluid can be discharged, preferably returned to the respective suction chamber.
- the bearing recess 20 opens into the return recess 25 .
- bearing webs which delimit the bearing recess 20 in the axial direction, also delimit the return recess 25 in the axial direction.
- the bearing recesses 20 are preferably arranged at a distance from the return recess 25 in the circumferential direction.
- the bearing recesses 20 are preferably formed symmetrically with respect to the return recess 25, in particular they are at the same distance from it.
- the filler piece 11 is mounted on the machine housing 2 by means of at least one retaining pin 26 .
- the filler piece 11 is supported on the retaining pin 26 in the circumferential direction.
- the filler piece 11 is rigidly connected to the retaining pin 26 .
- the filler piece 11 is rotatably mounted on the machine housing 2 via the retaining pin 26 , in particular about an axis of rotation running parallel to the axes of rotation 5 and 6 . This The axis of rotation corresponds, for example, to a longitudinal central axis of the retaining pin 26 or at least runs parallel to such.
- Figure 2 shows a schematic representation of an area of the internal gear fluid machine 1 in an alternative configuration, namely a housing wall 27 of the machine housing 2.
- the internal gear fluid machine 1 in the embodiment shown has only one of the filler piece parts, in particular the filler piece part comprising the segments 14 and 15, i.e. is not designed for reversing operation, but with a preferred direction of rotation.
- the housing wall 27 delimits the internal gear fluid machine 1 in the axial direction or closes off the machine housing 2 in this direction.
- the machine housing usually has a plurality of such housing walls 27, namely on opposite sides in the axial direction.
- a recess 28 is formed in the housing wall 27 as can be seen.
- the recess 28 serves to accommodate a machine shaft of the internal gear fluid machine 1 , which is coupled in a torque-proof manner to the first gear 3 and is preferably only in driving connection via the first gear 3 to the second gear 4 .
- the recess 28 is centered with respect to the first axis of rotation 5 .
- a pressure field 29 is formed in the housing wall 27 and is present as a depression.
- the pressure field 29 is overlapped by an axial disk, not shown here, of the internal gear fluid machine 1, which is pushed in the direction or towards the gear wheels 3 and 4 by pressurization of the pressure field 29 in order to bear sealingly against them.
- a further recess 30 forms a suction bore, via which fluid can flow into the fluid space 10, namely in particular the respective suction chamber.
- the retaining pin 26 is rotatably mounted on the housing wall 27 for mounting the filler piece 11 on the machine housing 2 .
- the bearing is not provided directly, but only indirectly via an intermediate piece 31 .
- the intermediate piece 31 is arranged in an intermediate piece receptacle 32 which is formed in the housing wall 27 .
- the intermediate piece 31 in turn has a retaining pin receptacle 33 into which the retaining pin 26 engages.
- the housing wall 27 consists of a housing wall material and the intermediate piece 31 consists of an intermediate piece material that differs from the housing wall material.
- the housing wall 27, in particular the entire machine housing 2, is preferably made of aluminum or an aluminum alloy, whereas the intermediate piece 31 is made of a stronger material, for example steel, in particular Tempered steel, particularly preferably nitrided steel.
- the intermediate piece 31 effectively prevents the housing wall 27 from being overstressed by forces introduced into the housing wall 27 by the retaining pin 26 .
- overpressing of the housing wall 27, in particular an excessively large Hertzian pressure is prevented. Accordingly, a fatigue strength of the internal gear fluid machine 1 is significantly improved by using the spacer 31 .
- FIG. 3 shows a sectional view through an area of the machine housing 2, more precisely along the section line AA shown in FIG.
- the intermediate piece 31 is arranged completely in the intermediate piece receptacle 32, ie it does not protrude from it.
- the retaining pin 26 completely passes through the intermediate piece 31 in the direction of a rotation axis 34 about which the retaining pin 26 is rotatably mounted on the housing wall 27 by means of the intermediate piece 31 .
- the retaining pin 26 is supported on a base 35 of the intermediate piece receptacle 32 . Accordingly, the retaining pin 26 is supported in the radial direction with respect to the axis of rotation 34 only indirectly via the intermediate piece 31 on the housing wall 27 and in the axial direction directly on the housing wall 27 .
- the holding pin 26 has a projection 36 which starts from a base body 37 of the intermediate piece 31 .
- the base body 37 is preferably continuously cylindrical, in particular continuously circular-cylindrical.
- a support part (not designated in more detail) extends from the base body 37 .
- the filling piece 11 is supported on the retaining pin 26 on the supporting part or the filling piece 11 is fastened to the retaining pin 26 via the supporting part.
- the projection 36 like the base body 37, can be cylindrical or circular-cylindrical. In any case, it has smaller dimensions in the radial direction with respect to the axis of rotation 34 than the base body 37.
- the projection 36 is arranged centered with respect to the base body 37 and/or the axis of rotation 34.
- the retaining pin 26 is supported on the bottom 35 of the intermediate piece receptacle 32 via the projection 36 . This allows the retaining pin 26 to tilt within the retaining pin receptacle 33 within a certain retaining pin play.
- the web 38 has a wall thickness that corresponds to at least 50% of a wall thickness of the intermediate piece 31, but is preferably greater. This ensures that the web 38 and thus the housing wall 27 is not deformed and thus damaged by forces introduced into the housing wall 27 via the retaining pin 26 .
- the intermediate piece 31 is preferably pressed into the intermediate piece receptacle 32, ie arranged in it with a press fit. Accordingly, the intermediate piece 31 is non-positively fixed with respect to the housing wall 27, namely in particular in the circumferential direction with respect to the axis of rotation 34. Additionally or alternatively, it can be provided that the intermediate piece 31 is fastened to the housing wall 27 in a form-fitting manner, in particular by a rotational movement of the intermediate piece 31 in turn of the intermediate piece receptacle 32 in the circumferential direction.
- a fluid guide groove 39 which is merely indicated here, to be formed in the intermediate piece 31 on its side facing the holding pin 26 .
- This serves to transport dirt particles out of the intermediate piece receptacle 32 by fluid flowing in the fluid guide groove 39 .
- the retaining pin receptacle 33 or a bearing space present in the radial direction between the intermediate piece 31 and the retaining pin 26 is supplied with pressurized fluid, for example via a fluid line 40 which is only indicated schematically here and which fluidly connects the bearing space to the pressure field 29.
- An inner wall 41 of the intermediate piece 31, against which the retaining pin 26 rests at least temporarily and/or at least in regions, is particularly preferably provided with a coating and/or a surface structure.
- the coating is in particular a polymer coating, particularly preferably a polytetrafluoroethylene coating.
- Such a coating is preferably designed in such a way as to reduce the friction between the retaining pin 26 and the intermediate piece 31 and correspondingly achieve low-friction rotary mounting of the retaining pin 26 on the housing wall 27 .
- the surface structure is designed, for example, such that fluid from the fluid chamber 10 between the retaining pin 26 and the Intermediate piece 31, ie in the holding pin receptacle 33, is conveyed. This also improves the bearing of the retaining pin 26 due to reduced friction.
- the surface structure is preferably characterized by elevations and depressions with a height in the micrometer range, so that the surface structure can also be referred to as a micro surface structure.
- the surface structure is formed in particular by honing or by long-stroke honing and is in particular designed analogously to the surface structure of a cylinder liner.
- the configuration of the internal gear fluid machine 1 described enables operation at high power levels, in particular at high pressures and/or at high speeds and/or pressure gradients, without realizing the housing wall 27 from a stronger material. Rather, the retaining pin 26 is reliably mounted on the housing wall 27 by means of the intermediate piece 31, so that the housing wall 27 cannot be deformed even at high power levels. As a result of the measures described, the service life of the internal gear fluid machine 1 is extended in this respect, while at the same time it can be or remains inexpensive to produce.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Rotary Pumps (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102021203111.0A DE102021203111A1 (de) | 2021-03-29 | 2021-03-29 | Innenzahnradfluidmaschine sowie Verfahren zum Herstellen einer Innenzahnradfluidmaschine |
| PCT/EP2022/058141 WO2022207561A1 (de) | 2021-03-29 | 2022-03-28 | Innenzahnradfluidmaschine sowie verfahren zum herstellen einer innenzahnradfluidmaschine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP4314560A1 true EP4314560A1 (de) | 2024-02-07 |
| EP4314560B1 EP4314560B1 (de) | 2025-05-07 |
Family
ID=81449189
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP22719811.6A Active EP4314560B1 (de) | 2021-03-29 | 2022-03-28 | Innenzahnradfluidmaschine sowie verfahren zum herstellen einer innenzahnradfluidmaschine |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP4314560B1 (de) |
| CN (1) | CN117098918A (de) |
| DE (1) | DE102021203111A1 (de) |
| WO (1) | WO2022207561A1 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2025079314A1 (ja) * | 2023-10-12 | 2025-04-17 | 住友精密工業株式会社 | 内接ギヤポンプ |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2313085C2 (de) * | 1973-03-16 | 1984-05-24 | Otto 7502 Malsch Eckerle | Axial und radial kompensierte Hochdruck-Zahnradpumpe |
| JPS5944511B2 (ja) | 1979-12-17 | 1984-10-30 | 株式会社不二越 | 内接ギヤポンプ・モ−タ |
| DE19930911C1 (de) | 1999-07-06 | 2000-07-20 | Voith Turbo Kg | Axialkompensation einer Innenzahnradpumpe für den geschlossenen Kreislauf |
| DE102008053318A1 (de) | 2008-10-27 | 2010-04-29 | Trw Automotive Gmbh | Reversibel betreibbare Zahnradmaschine, sowie Fahrzeuglenksystem und Verfahren zur Steuerung eines Fahrzeuglenksystems |
| DE202013103826U1 (de) * | 2013-05-13 | 2013-09-09 | Eckerle Industrie-Elektronik Gmbh | Innenzahnradmaschine mit Füllstück-Rückhalteeinrichtung |
| DE102014103959A1 (de) * | 2014-03-21 | 2015-09-24 | Eckerle Industrie-Elektronik Gmbh | Motor-Pumpen-Einheit |
-
2021
- 2021-03-29 DE DE102021203111.0A patent/DE102021203111A1/de active Pending
-
2022
- 2022-03-28 WO PCT/EP2022/058141 patent/WO2022207561A1/de not_active Ceased
- 2022-03-28 CN CN202280025846.3A patent/CN117098918A/zh active Pending
- 2022-03-28 EP EP22719811.6A patent/EP4314560B1/de active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN117098918A (zh) | 2023-11-21 |
| EP4314560B1 (de) | 2025-05-07 |
| WO2022207561A1 (de) | 2022-10-06 |
| DE102021203111A1 (de) | 2022-09-29 |
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