Pump arrangement comprising a venting channel

Abstract

A pump arrangement for supplying a machine assembly with liquid, in particular for supplying a motor and / or a transmission of a motor vehicle, comprising: a pump comprising a pump housing (10, 20) which has a suction port (24) and a pressure port (23); a delivery chamber which is formed in the pump housing (10, 20) and comprises a low-pressure region connected to the suction port (24) and a high-pressure region connected to the pressure port (23); a delivery element (61, 62), which is formed in the delivery chamber, for delivering a liquid from the suction port (24) to the pressure port (23); and an electric motor (50), which is arranged in a motor space (54), for driving the delivery element (61, 62), wherein at least one venting channel (13) which is formed in the pump housing (10, 20) fluidically connects the low-pressure region of the delivery chamber to the motor space (54), wherein the venting channel (13) emerges into the motor space (54) at at least one intersection (14) which is arranged geodetically higher than the suction port (24) when the pump arrangement is used as intended.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims priority to German Application No. 10 2025 112 593.7, filed Mar. 31, 2025, the contents of such application being incorporated by reference herein.FIELD OF THE INVENTION

[0002] The invention relates to a pump arrangement for supplying a machine assembly with fluid, in particular a liquid. The invention relates in particular to a pump arrangement for supplying a motor and / or a transmission of a motor vehicle. The fluid, in particular the liquid, can for example be oil for lubricating and / or cooling the machine assembly. The liquid can in particular be water, a glycol mixture or a dielectric liquid. The pump arrangement can in particular comprise a pump having a pump housing, wherein the pump housing preferably has at least one suction port and pressure port. A delivery chamber is formed in the pump housing, wherein a delivery element for delivering the fluid, in particular the liquid, from the suction port to the pressure port is arranged in the delivery chamber.

[0003] The pump arrangement can also comprise a drive, in particular an electric motor, for driving the delivery element, wherein the drive is preferably formed in a motor space. The drive can in particular be a wet-running electric motor, wherein liquid for lubricating and / or cooling the electric motor is situated in the motor space. The liquid situated in the motor space is preferably the liquid to be delivered by the pump. The motor space can in particular be fluidically connected to the delivery chamber.BACKGROUND OF THE INVENTION

[0004] In such pump arrangements comprising a pump and an electric motor, the motor space is typically cooled and / or lubricated using liquid delivered by the pump. A compromise therefore has to be found between a sufficient fluid connection between the delivery chamber and the motor space and the effectiveness of the pump arrangement.

[0005] If the fluid connection is insufficient, the fluid level (in particular, the liquid level) in the motor space can then remain too low, such that an air bubble is formed in the motor space. The components of the electric motor can then in particular be insufficiently supplied with fluid when in operation. A larger fluid connection, however, lowers the effectiveness of the pump arrangement, and the pump arrangement has to be designed with correspondingly larger dimensions in order to supply the machine assembly.

[0006] When the pump is at rest, a drop in the fluid level in the motor space can occur. The liquid can in particular flow from the motor space back into a reservoir while the pump is at rest. If the liquid is an oil, it can for example flow into an oil sump formed below the pump arrangement. As the liquid drains into the reservoir, the fluid level in the motor space drops and can be partially or entirely below the electric motor and / or its components, whereby at most only some of the motor is then immersed in the liquid.

[0007] If the fluid level in the motor space is low, the electric motor may run unwetted for a time when it is restarted, until the motor space and therefore the electric motor is sufficiently supplied with liquid by the pump which is driven by the electric motor. This can significantly restrict the heat dissipation and / or lubrication of the electric motor. The electric motor can then become overheated and / or worn.

[0008] This problem also occurs in cartridge-type pump arrangements which typically deliver the liquid from an accommodating space in which the pump arrangement itself and the electric motor are arranged, wherein the accommodating space can directly form the motor space, or the pump arrangement is arranged in the accommodating space together with a housing which forms the motor space.

[0009] As described, a drop in the fluid level in the accommodating space can occur when the pump is at rest. The liquid can flow from the accommodating space back into a reservoir while the pump is at rest. The fluid level can then drop to below a critical height, such that the suctioning point of the pump, in particular the suction port of the pump, is partially or entirely above the remaining fluid level.

[0010] The pump, when restarted, then initially suctions air or an air-liquid mixture, since there is little or no liquid situated in the region of the suctioning point. In the course of the suctioning process, the air is displaced by the inflowing liquid, whereby the fluid level gradually rises again, until the suctioning point is again covered by the liquid. An air bubble can nonetheless remain in the accommodating space above the fluid level.

[0011] The height of the fluid level and the extent of the air bubble remaining are then dependent inter alia on the installed location and geodetic height of the suctioning point. In unfavourable installation environments, the air bubble can be large, whereby the electric motor is only partially surrounded by liquid for an extended period of time. Suctioning air or the air-fluid mixture can also cause the electric motor to be insufficiently supplied with liquid. The electric motor can then become overhead and / or worn, thus making the pump arrangement more susceptible to faults, which can significantly reduce the service life of the pump arrangement.SUMMARY OF THE INVENTION

[0012] An aspect of the invention aims to provide a pump arrangement in which supplying the electric motor with fluid, in particular liquid, is improved.

[0013] An aspect of the invention relates to a pump arrangement for supplying a machine assembly with fluid, in particular liquid. An aspect of the invention relates in particular to a pump arrangement for supplying a motor and / or transmission of a motor vehicle. The liquid can be a liquid for cooling and / or lubricating the machine assembly. The liquid can for example be an oil, water, a glycol mixture and / or a dielectric liquid for supplying the machine assembly. The liquid can in particular be a liquid for cooling and / or lubricating a drive and / or transmission of a motor vehicle.

[0014] The pump arrangement comprises a pump having a pump housing. The pump can be a rotary pump. The pump can for example be formed by an internal gear pump, a vane pump, a pendulum-slider pump or an external gear pump.

[0015] The pump housing preferably has a suction port and a pressure port. A “pump housing” is in particular to be understood to mean the external housing of the pump which protects and encloses the internal components of the pump. Internal components can for example include delivery chambers, delivery elements such as for example rotors, contour rings, drive shafts, bearings, valves and / or gaskets, etc. The liquid can be channelled from the suction port to the pressure port via the pump housing.

[0016] A “suction port” is to be understood to mean a connection and / or opening on the pump housing via which the liquid to be delivered enters the pump housing. It can be a port on the suction side of the pump housing and / or pump, via which the liquid is suctioned by the negative pressure generated by the pump, wherein the word “port” is not to be understood restrictively, i.e. the suction port can for example emerge into the environment of the pump arrangement. Alternatively, the suction port can be connected to an assembly housing of the machine assembly to be supplied and / or to a reservoir for storing the fluid. The suction port can for example be connected to a port of the assembly housing and / or reservoir.

[0017] A “pressure port” is to be understood to mean a connection and / or opening on the pump housing via which the liquid to be delivered exits the pump housing. It can be a port on the pressure side of the pump housing and / or pump, via which the liquid can flow out due to the positive pressure generated by the pump, wherein the word “port” is not to be understood restrictively, i.e. the pressure port can for example emerge into the environment of the pump arrangement. The pressure port is preferably connected to an assembly housing of the machine assembly to be supplied. The pressure port can for example be connected to a port of the assembly housing.

[0018] A delivery chamber is preferably formed in the pump housing. The delivery chamber has a low-pressure region and a high-pressure region. The low-pressure region is preferably connected, in particular fluidically, to the suction port. The high-pressure region is preferably connected, in particular fluidically, to the pressure port. The pump housing can comprise a first housing part and a second housing part. The first housing part and the second housing part can delineate the delivery chamber circumferentially and / or axially on its end-facing sides.

[0019] A “delivery chamber” is in particular to be understood to mean the internal region of the pump housing in which the liquid is actually pumped, i.e. in which mechanical energy is transmitted to the liquid by at least one delivery element. The liquid is suctioned, compressed and / or delivered in the delivery chamber. The delivery chamber contains the active delivery mechanisms of the pump, such as for example rotors, vanes, impellers or pistons, which move the liquid. It is the region of the pump housing in which the liquid is delivered from a delivery chamber inlet in the low-pressure region to a delivery chamber outlet in the high-pressure region.

[0020] The pump arrangement also comprises a delivery element for delivering the liquid, in particular from the suction port towards the pressure port. The delivery element is formed in the delivery chamber. The delivery element can for example be a rotary-driven rotor. The delivery element can in particular be formed from an externally toothed gear and an internally toothed gear ring which mesh with each other. Alternatively, the delivery element can be a rotor comprising vanes which can be shifted, in particular radially.

[0021] The pump arrangement also comprises a drive for driving the delivery element. The drive is preferably formed by an electric motor. The drive can in particular be a wet-running electric motor. The drive is preferably arranged in a motor space. The delivery element can be rotary-driven via a rotor shaft of the electric motor. The delivery element can be non-rotationally connected to the rotor shaft. In addition, the delivery element can be connected, secured against shifting in the axial direction, to the rotor shaft. Alternatively, the delivery element can be able to move freely in the axial direction on the rotor shaft.

[0022] The drive, in particular the electric motor, can comprise a rotating part, in particular a rotor, and a fixed part, in particular a stator. The electric motor can be an internal-rotor motor or an external-rotor motor. The stator can in particular surround the rotor at least partially on the radially outer side. The stator can in particular surround the rotor completely on the radially outer side. Alternatively, the rotor can surround the stator at least partially on the radially outer side. The rotor can in particular surround the stator completely on the radially outer side.

[0023] A “wet-running electric motor” is in particular understood to mean an electric motor in which the components are partially or entirely surrounded by a liquid, at least when the electric motor is in operation. The liquid can preferably be the liquid delivered by the pump for supplying the machine assembly. The liquid serves in particular to lubricate bearings and / or moving parts of the electric motor and / or to cool the electrical and mechanical components of the electric motor. The motor space is preferably at least partially filled with the liquid delivered by the pump for supplying the machine assembly, when the pump arrangement is in operation. Preferably, at least 50% and in particular at least 70% of the motor is surrounded by liquid when the pump arrangement is in operation.

[0024] The pump arrangement, in particular the pump and the drive, can be embodied in the form of a module, wherein the term “module” is to be understood to mean a self-contained functional unit which performs a particular task or function within an overall system. Within the context of the pump arrangement, this means in particular that the pump and the drive are preferably combined with each other and designed such that they together form a compact prefabricated sub-assembly. This sub-assembly can for example be arranged as a complete unit in or on the machine assembly to be supplied.

[0025] The pump arrangement can in particular be embodied as a cartridge-type pump arrangement, such that the pump and the associated drive can be arranged and / or formed together in an accommodating space, wherein the accommodating space can simultaneously form the motor space of the drive. Alternatively, the pump arrangement can be arranged and / or formed in the accommodating space together with the motor space which is formed by a housing of the pump arrangement. The pump arrangement need not be embodied as a cartridge-type pump arrangement. The pump arrangement can for example be designed to be fastened to an assembly housing of the machine assembly.

[0026] The motor space can be formed by a housing of the pump arrangement. The motor space can in particular be directly integrated in the housing of the pump arrangement. The housing of the pump arrangement can completely enclose the motor space. The housing can ensure that the drive is separated from an external environment of the pump arrangement and that the liquid is held in the motor space. The motor space can be an integrated volume within the housing of the pump arrangement, in which the drive and the liquid are situated.

[0027] Alternatively, the motor space can be formed by an accommodating space of the pump arrangement, in which the pump arrangement is arranged. The motor space can in particular be formed by an external accommodating space in which the overall pump arrangement, including the pump together with the pump housing and the drive, can be arranged. The drive is then not or is only partially surrounded by the housing of the pump arrangement.

[0028] This accommodating space can for example form part of the machine assembly or a reservoir in which the liquid is stored. The accommodating space can for example be formed by the machine assembly to be supplied. The accommodating space can in particular be a cavity in an assembly housing of the machine assembly. The accommodating space can for example be cup-shaped, comprising an end-facing wall and a circumferential wall.

[0029] If the pump arrangement is arranged in the accommodating space, the pump arrangement can close off the accommodating space. The pump arrangement can in particular close off the accommodating space on a side which faces away from the end-facing wall. The pump arrangement preferably closes off the accommodating space in a fluid-tight seal.

[0030] At least one venting channel is preferably formed in the pump housing. The venting channel can connect the low-pressure region of the delivery chamber fluidically to the motor space. The venting channel comprises at least one intersection at which the venting channel emerges into the motor space. This intersection can be a first intersection, wherein the venting channel can for example comprise a second intersection at which the venting channel emerges into the motor space at a point spaced apart from the first intersection. The second intersection can be geodetically and / or axially and / or circumferentially spaced apart from the first intersection.

[0031] When the pump arrangement is used as intended, the intersection is preferably formed geodetically higher than the suction port. If the intersection is a first intersection, the first intersection and for example the second intersection are preferably both formed geodetically higher than the suction port. The first intersection and the second intersection preferably have the same geodetic height. The first intersection and the second intersection can then for example be spaced apart from each other axially and / or in the circumferential direction of the motor space. Alternatively, the first intersection can for example be arranged geodetically lower than the second intersection.

[0032] When the pump arrangement is used as intended, the intersection is preferably formed geodetically higher than the pressure port. If the intersection is a first intersection, the first intersection and for example the second intersection are preferably both formed geodetically higher than the pressure port. When the pump arrangement is used as intended, the intersection can in particular be formed geodetically higher than the delivery chambers of the pump. If the intersection is a first intersection, the first intersection and for example the second intersection are preferably both formed geodetically higher than the delivery chambers of the pump.

[0033] When the pump arrangement is used as intended, the intersection is preferably formed geodetically higher than the rotor of the electric motor and / or the stator. If the intersection is a first intersection, the first intersection and for example the second intersection are preferably both formed geodetically higher than the rotor of the electric motor and / or the stator.

[0034] If the electric motor is an internal-rotor motor, i.e. the stator surrounds the rotor on the radially outer side, the first intersection and preferably the second intersection, if present, can be formed at the geodetic height of the stator. The first intersection and preferably the second intersection, if present, can in particular be formed in a geodetically upper region of the stator. The first intersection and preferably the second intersection, if present, can in particular be formed geodetically higher than the rotor.

[0035] If the electric motor is an external-rotor motor, i.e. the rotor surrounds the stator on the radially outer side, the first intersection and preferably the second intersection, if present, can be formed at the geodetic height of the rotor. The first intersection and preferably the second intersection, if present, can in particular be formed in a geodetically upper region of the rotor. The first intersection and preferably the second intersection, if present, can in particular be formed geodetically higher than the stator.

[0036] The venting channel preferably serves to remove air and / or excess gas from the motor space. Air and / or excess gas which is trapped in the motor space can in particular be channelled away by the venting channel. By connecting the motor space to the low-pressure region, air or excess gas can be actively suctioned away from the motor space. Air can in particular be suctioned away from the motor space via the venting channel. In this way, the fluid level in the motor space can be geodetically higher than for example the suction port and / or the pressure port and / or the delivery chamber of the pump. The fluid level, in particular the liquid level, can in particular rise far enough that at least 50% and preferably at least 70% of the motor is surrounded by liquid when the pump arrangement is in operation.

[0037] The fluid level can in particular rise far enough that it is at least in an upper third of the drive, preferably in an upper quarter of the drive. The fluid level can particularly preferably rise far enough that the fluid level is geodetically higher than the drive.

[0038] The venting channel can in particular ensure that the motor space can be filled as completely as possible with liquid without trapped air impairing the function of the pump and / or the cooling of the motor. The venting channel can preferably ensure that at least 50% and in particular at least 70% of the motor space can be filled with liquid when the pump arrangement is in operation. Air situated in the motor space can for example be drained towards the delivery chamber via the venting channel when the pump arrangement is in operation, such that the motor space can be optimally filled with liquid.

[0039] The motor space is at least partially filled with liquid when the pump arrangement is in operation. The motor space can in particular be filled with the liquid delivered by the pump when in operation. The height of the fluid level of the fluid situated in the motor space can preferably be set at the height of the intersection between the venting channel and the motor space when the pump arrangement is in operation, i.e. the higher the venting channel emerges into the motor space, the higher the fluid level which is preferably set in the motor space when the pump arrangement is in operation.

[0040] When the pump arrangement is used as intended, the venting channel preferably emerges into the motor space geodetically higher than a lowest point in the motor space and / or a lowest point of the suction port. When the pump arrangement is used as intended, the venting channel preferably emerges into the motor space in an upper half of the motor space in the vertical direction. When the pump arrangement is used as intended, the venting channel can in particular emerge into the motor space in an upper third of the motor space in the vertical direction. When the pump arrangement is used as intended, the venting channel preferably emerges into the motor space in an upper quarter of the motor space in the vertical direction.

[0041] The delivery chamber can be delineated on a first end-facing side by a first chamber wall and on the second end-facing side which faces away from the first chamber wall by a second chamber wall. The first chamber wall and the second chamber wall can in particular delineate the delivery chamber on its end-facing sides. The first chamber wall can be formed by the first housing part of the pump housing, and the second chamber wall can be formed by the second housing part of the pump housing. The first chamber wall can in particular be formed by an end-facing wall of the first housing part which delineates the delivery chamber on the first end-facing side. The second chamber wall can in particular be formed by an end-facing wall of the second housing part which delineates the delivery chamber on the second end-facing side.

[0042] A low-pressure pocket which overlaps the low-pressure region of the delivery chamber can be formed in the first chamber wall. The low-pressure pocket can at least partially overlap the low-pressure region of the delivery chamber in an axial plan view onto the first chamber wall. A “low-pressure pocket” is to be understood to mean a specific region in the first chamber wall of the delivery chamber, which in particular serves as an equalising opening. This opening can fluidically connect at least one first delivery cell to a circumferentially adjacent second delivery cell, bypassing the delivery element, such that liquid can flow from the first delivery cell into the second delivery cell.

[0043] The low-pressure pocket can be formed as a cavity in the first chamber wall of the delivery chamber which is open towards the second chamber wall. The low-pressure pocket can have a curved, in particular reniform shape. Alternatively, however, the low-pressure pocket can also be embodied in the form of a groove which extends in the circumferential direction of the delivery chamber.

[0044] The low-pressure pocket can in particular be formed on the end-facing side of the delivery chamber which faces axially away from the delivery chamber inlet. The delivery chamber inlet, via which the liquid flows from the suction port into the delivery chamber, can in particular be formed in the second chamber wall. The delivery chamber inlet can be embodied in the form of a suction pocket. The suction pocket and the low-pressure pocket can in particular at least partially overlap each other. The suction pocket and the low-pressure pocket can in particular be congruent. The suction pocket and the low-pressure pocket can be designed to suction away liquid.

[0045] The low-pressure pocket and / or the suction pocket can be fluidically connected to the motor space. The low-pressure pocket and / or the suction pocket can in particular be fluidically connected to the motor space via the venting channel. The venting channel can be formed in the first chamber wall or the second chamber wall. The venting channel can in particular be embodied in the form of a groove in the first chamber wall which is open towards the second chamber wall, or the venting channel can be embodied in the form of a groove in the second chamber wall which is open towards the first chamber wall. The venting channel is preferably formed in the first chamber wall. Alternatively, the venting channel can also be embodied in the form of a passage, for example a passage bore, in the first chamber wall, the second chamber wall and / or a circumferential wall of the delivery chamber.

[0046] If the venting channel is formed by a groove which is open towards the second chamber wall, the venting channel can be delineated by the delivery element and / or the second housing part, at least in portions, on the side which faces the second chamber wall. The delivery element and / or the second housing part can in particular at least partially overlap the venting channel in an axial plan view onto the first chamber wall. This applies analogously if the venting channel is embodied in the form of a groove which is open towards the first chamber wall.

[0047] The venting channel can in particular extend, at least in portions, in a contact region between the first housing part and the second housing part. The venting channel can for example be formed in an end-facing side of the first housing part which axially faces the second housing part and can be axially delineated by an end-facing side of the second housing part which axially faces the first housing part. Alternatively, the venting channel can be formed at least partially in the end-facing side of the second housing part which axially faces the first housing part.

[0048] The venting channel can be produced together with the first chamber wall; the venting channel can in particular be produced together with the first chamber wall in an original-moulding method. If the first chamber wall is formed by the first housing part, the venting channel can be produced together with the first housing part; the venting channel can in particular be produced together with the first housing part in an original-moulding method.

[0049] Alternatively, the venting channel can be produced latterly. The venting channel can for example be latterly produced in a machining method. The venting channel can in particular be milled into the first chamber wall or, respectively, the end-facing side of the first housing part which forms the first chamber wall and / or can be drilled through the first chamber wall or, respectively, the first housing part.

[0050] The venting channel can have a circular, oval or rectangular cross-section. The size of the cross-section is preferably designed such that it is sufficiently large to quickly drain air bubbles, but small enough to not needlessly reduce the effectiveness of the pump.

[0051] The venting channel can extend at least partially outside the delivery chamber in an axial plan view onto the first chamber wall. The venting channel can in particular extend at least partially outside the delivery chamber in the radial direction. The venting channel can at least partially surround the delivery chamber circumferentially.

[0052] The venting channel can emerge into the low-pressure pocket at its end which faces away from the intersection. The venting channel can in particular extend from the low-pressure pocket up to the intersection at which the venting channel emerges into the motor space. The venting channel can in particular emerge into the low-pressure pocket at its end which faces away from the intersection, at an end portion of the low-pressure pocket which is upstream in the circumferential direction of the delivery chamber, wherein “upstream” refers to the delivery direction in the delivery chamber. The venting channel can in particular emerge into a region of the low-pressure pocket which overlaps with a region of the delivery chamber in which a local pressure minimum exists when the pump arrangement is in operation.

[0053] A pressure pocket which overlaps the high-pressure region of the delivery chamber can be formed in the first chamber wall. The pressure pocket can at least partially overlap the high-pressure region of the delivery chamber in an axial plan view onto the second chamber wall. A “pressure pocket” is to be understood to mean a specific region in the first chamber wall of the delivery chamber, which in particular serves as an equalising opening. This opening can fluidically connect at least one first delivery cell to a circumferentially adjacent second delivery cell, such that liquid can flow from the first delivery cell into the second delivery cell.

[0054] The pressure pocket can be formed as a cavity in the first chamber wall of the delivery chamber which is open towards the second chamber wall. The pressure pocket can have a curved, in particular reniform shape. Alternatively, however, the pressure pocket can also for example be embodied in the form of a groove which extends in the circumferential direction of the delivery chamber.

[0055] The pressure pocket can in particular be formed on the end-facing side of the delivery chamber which faces away from the delivery chamber outlet. The delivery chamber outlet, via which the liquid flows from the delivery chamber towards the pressure port, can in particular be formed in the second chamber wall. The delivery chamber outlet can be embodied in the form of a second pressure pocket. The pressure pocket can then be referred to as the first pressure pocket. The first pressure pocket and the second pressure pocket can in particular at least partially overlap each other. The first pressure pocket and the second pressure pocket can in particular be congruent.

[0056] The pressure pocket, in particular the first pressure pocket, can be fluidically connected to the motor space. The pressure pocket is in particular fluidically connected to the motor space via an internal leak and / or a pressure channel. This means that liquid can flow directly or indirectly from the pressure pocket towards the motor space. An “indirect fluidic connection” is in particular to be understood to mean the internal leak within the pump arrangement. A “direct fluidic connection” is in particular to be understood to mean the fluidic connection via the pressure channel, via which liquid can specifically flow from the delivery chamber.

[0057] An “internal leak” is in particular to be understood to mean the transition of liquid within the system through small gaps or sealing surfaces within the pump arrangement. The leak can be used to guide liquid into the motor space without a separate channel being required for this purpose. The pressure channel, however, is a specifically designed conduit within the pump arrangement which channels the liquid from the pressure pocket towards the motor space.

[0058] If the pressure pocket is fluidically connected to the motor space via a pressure channel, the pressure channel can emerge into the motor space or a bearing portion of the rotor shaft of the electric motor at at least one pressure intersection. If the pressure channel emerges at its pressure intersection into a bearing portion of the rotor shaft, the liquid can flow towards the motor space via an internal leak. The liquid can in particular flow along the bearing portion towards the motor space. When the pump arrangement is used as intended, the pressure intersection can in particular be arranged geodetically lower than the intersection of the venting channel.

[0059] When the pump arrangement is used as intended, the low-pressure pocket and / or the delivery chamber inlet is / are preferably arranged geodetically lower than the pressure pocket and / or the delivery chamber outlet. The low-pressure pocket and / or the delivery chamber inlet can in particular overlap the circumferentially lowest region of the delivery chamber.

[0060] The pump housing can comprise the first housing part and the second housing part. The electric motor is preferably arranged on a side of the first housing part which faces away from the delivery chamber and / or the second housing part. The first housing part can in particular be formed between the delivery chamber and the motor space. The first housing part can for example fluidically separate the motor space from the delivery chamber. The first housing part can be arranged between the second housing part and the motor space.

[0061] The first housing part can form the bearing portion for the rotor shaft of the electric motor. A passage for the rotor shaft of the electric motor can in particular be formed in the first housing part. The rotor shaft can be directly or indirectly mounted in the passage. A bearing socket for the rotor shaft can in particular be arranged in the passage.

[0062] As described above, the first housing part can form the first chamber wall. The first housing part and the second housing part can delineate the delivery chamber circumferentially and / or on its end-facing sides. Alternatively, the first housing part and the second housing part can delineate a pump space circumferentially and / or on its end-facing sides, wherein a contour ring and / or pressure plates which delineate the delivery chamber circumferentially and / or on its end-facing sides can for example be additionally formed in the pump space.

[0063] The suction port is preferably formed on a side of the pump housing which faces away from the electric motor and / or the motor space. The suction port can in particular be formed on the second housing part. The suction port can be formed on an end-facing side or on a circumferential side of the pump housing.

[0064] The pressure port is preferably formed on a side of the pump housing which faces away from the electric motor and / or the motor space. The pressure port can in particular be formed on the second housing part. The pressure port can be formed on an end-facing side or on a circumferential side of the pump housing.

[0065] The first housing part and / or the second housing part can delineate the delivery chamber axially on its end-facing sides and circumferentially. The first housing part can in particular for example delineate the delivery chamber axially on one end-facing side, while the second housing part delineates the delivery chamber axially on one end-facing side and circumferentially.

[0066] The end-facing side of the second housing part which axially faces the first housing part, and the end-facing side of the first housing part which axially faces the second housing part, can preferably be in direct contact. It is in particular possible for no other housing parts to be formed between the first housing part and the second housing part. In alternative embodiments, a third housing part can for example be formed between the first housing part and the second housing part. The third housing part can for example be designed to delineate the delivery chamber circumferentially, while the first housing part and the second housing part delineate the delivery chamber axially on its end-facing sides. If, for example, the pump housing comprises a third housing part, the venting channel can be formed between the first housing part and the third housing part, instead of the second housing part as described above.

[0067] The pump arrangement can comprise a motor cover in addition to the pump housing, in particular in addition to the first housing part and the second housing part. The motor cover can delineate and in particular close off the motor space on a side which faces away from the delivery chamber. The motor cover can in particular close off the motor space in a fluid-tight seal. If the pump arrangement is arranged in the accommodating space, the motor cover can close off the accommodating space on the side opposite the end-facing wall of the accommodating space.

[0068] The motor cover can delineate the motor space circumferentially and / or on its end-facing sides. The motor cover together with the first housing part and / or the second housing part of the pump housing can for example at least partially delineate the motor space circumferentially and / or on its end-facing sides. The first housing part, the second housing part and the motor cover can form part of the housing of the pump arrangement.

[0069] If the pump arrangement is not designed to be arranged in an accommodating space, the motor space is delineated circumferentially and on its end-facing sides, in particular in a fluid-tight seal, by the housing of the pump arrangement. The motor space can also be delineated circumferentially and on its end-facing sides by the housing of the pump arrangement if the pump arrangement is designed to be accommodated in the accommodating space. The motor space is not then formed by the accommodating space.

[0070] The second housing part can form an accommodating well in which the pump, the first housing part and the electric motor can be arranged. The first housing part and / or the electric motor can in particular be surrounded on the radially outer side by the second housing part. A circumferential wall of the second housing part can in particular protrude from the first housing part towards the electric motor and delineate the motor space circumferentially. The motor cover can preferably protrude at least partially into the motor space in order to delineate the motor space on the side which faces away from the first housing part.

[0071] The pump arrangement can have an assembling structure by means of which the pump arrangement can be assembled at an accommodating point or in the accommodating space. The pump arrangement can in particular be connected to or assembled near a consumer via the assembling structure. The consumer can for example be the machine assembly to be supplied. The assembling structure preferably protrudes from the housing of the pump arrangement on the radially outer side. The assembling structure can for example be formed by the motor cover and / or the pump housing, for example the second housing part.BRIEF DESCRIPTION OF THE DRAWINGS

[0072] An aspect of the invention is described below on the basis of example embodiments. Features disclosed by the example embodiments advantageously develop the subject matter of the claims and also the embodiments described above.

[0073] There is shown:

[0074] FIG. 1 an axial cross-section through the pump arrangement in accordance with a first example embodiment;

[0075] FIG. 2 an axial plan view onto a first housing part of a first example embodiment;

[0076] FIG. 3 an axial cross-section through the first housing part of the first example embodiment;

[0077] FIG. 4 an axial cross-section through the pump arrangement in accordance with a second example embodiment;

[0078] FIG. 5 an axial plan view onto a first housing part of a second example embodiment;

[0079] FIG. 6 an axial plan view onto the first housing part and a delivery element of the second example embodiment.DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS

[0080] FIGS. 1 to 3 show a pump arrangement for supplying a machine assembly 70 with liquid in accordance with a first example embodiment. The first example embodiment shall be described in more detail below on the basis of FIGS. 1 to 3. FIG. 1 shows an axial cross-section through the pump arrangement. FIG. 2 shows an axial plan view onto the first housing part 10 of the first example embodiment FIG. 3 shows an axial cross-section through the first housing part 10.

[0081] The pump arrangement in accordance with the first example embodiment is embodied as a cartridge-type pump arrangement. The pump arrangement is at least partially accommodated in an accommodating space. In accordance with the first example embodiment, the accommodating space is formed by the assembly housing 70 of the machine assembly to be supplied. The accommodating space is cup-shaped, comprising an end-facing wall which faces the pump arrangement and a circumferential wall which surrounds the pump arrangement circumferentially.

[0082] The pump arrangement of the first example embodiment comprises a pump and an electric motor 50 which is arranged in a motor space 54, wherein the motor space 54 is formed by the accommodating space in which the pump arrangement is formed. The motor space 54 is delineated on one end-facing side by a motor cover 30. The motor space 54 is in particular closed off in a fluid-tight seal by the motor cover 30 on the side which faces away from the end-facing side, i.e. the pump arrangement closes off the accommodating space on the side which faces away from the end-facing side. The pump arrangement in particular closes off the accommodating space in a fluid-tight seal.

[0083] The pump arrangement also has an assembling structure. The pump arrangement can for example be able to be fastened to the machine assembly 70 via the assembling structure. In accordance with the present example embodiment, the assembling structure is formed by the motor cover 30.

[0084] The pump of the pump arrangement comprises a pump housing 10, 20 having a suction port 24 and a pressure port 23. In the present example embodiment, the pump housing comprises a first housing part 10 and a second housing part 20, wherein the suction port 24 and the pressure port 23 are formed facing the end-facing wall of the accommodating space. The suction port 24 and the pressure port 23 are in particular formed by the second housing part. The pressure port 23 is connected, in particular in a fluid-tight seal, to an assembly port which is formed in the end-facing wall of the accommodating space. The pressure port 23 protrudes in particular into the assembly port.

[0085] When the pump arrangement is in operation, the accommodating space is at least partially filled with the liquid delivered by the pump. The suction port 24 emerges into the accommodating space. When the pump arrangement is in operation, the pump suctions liquid from the accommodating space via the suction port 24 and discharges it again via the pressure port 23.

[0086] A delivery chamber, having a low-pressure region connected to the suction port 24 and a high-pressure region connected to the pressure port 23, is formed in the pump housing 10, 20. In the present case, the first housing part 10 and the second housing part 20 delineate the delivery chamber circumferentially and axially on its end-facing sides.

[0087] In the present example embodiment, the first housing part 10 forms a first chamber wall 11 which delineates the delivery chamber on a first end-facing side. The second housing part 20 forms a second chamber wall 22, which delineates the delivery chamber on a second end-facing side which faces away from the first end-facing side, and a circumferential wall which delineates the delivery chamber circumferentially.

[0088] This configuration is optional. It will be evident to the person skilled in the art that it is for example also possible for the first housing part 10 to delineate the delivery chamber circumferentially. Alternatively, the first housing part 10 and the second housing part 20 can for example also house pressure plates and / or a contour ring which respectively delineate the delivery chamber on its end-facing sides and circumferentially. The first chamber wall 11 and / or the second chamber wall 22 can in particular each be formed by a separate component.

[0089] A delivery element 61, 62 for delivering the fluid from the suction port 24 to the pressure port 23 is formed in the delivery chamber. The delivery element 61, 62 comprises a rotor 61 and a gear ring 62 which circumferentially surrounds the rotor 61. The rotor 61 is embodied in the form of an externally toothed gear which is arranged such that it meshes with the gear ring 62.

[0090] The delivery element 61, 62 is rotary-driven via a rotor shaft 53 of the electric motor 50. The rotor 61 is in particular rotary-driven by the rotor shaft 53, wherein the rotor 61 is non-rotationally connected to the rotor shaft 53. When the rotor 61 is rotated, the gear ring 62 is slaved by the rotor 61 and set in rotational motion. The rotor 61 can be connected to the rotor shaft 53 such that it is secured against shifting in the axial direction. Alternatively, the rotor 61 can be able to freely move in the axial direction on the rotor shaft 53.

[0091] The electric motor 50 is formed on the side of the first housing part 10 which faces away from the delivery chamber. The first housing part 10 comprises a bearing portion 19 in the form of a passage opening in which the rotor shaft 53 of the electric motor 50 is accommodated. The bearing portion 19 can directly mount the rotor shaft 53, as shown for example in FIG. 1. In alternative embodiments, the bearing portion 19 can for example also have a bearing socket in which the rotor shaft 53 is mounted.

[0092] When the pump arrangement and / or pump is at rest, the liquid may flow away from the accommodating space. When the pump arrangement is at rest, the liquid can in particular flow from the accommodating space back into a reservoir (not shown). The fluid level in the accommodating space and / or motor space 54 can then drop when the pump is at rest, such that the suction port 24 emerges into the accommodating space above the fluid level.

[0093] When the pump is restarted, air may initially be suctioned from the accommodating space via the suction port 24. Due to the negative pressure which arises in the accommodating space, the accommodating space is gradually refilled with liquid until the suction port 24 is again below the fluid level. However, the fluid level generally only rises up to and above the suction port 24, hence an air bubble can remain in the accommodating space. The motor 50 may then not be supplied with enough liquid to sufficiently cool it.

[0094] In order to ensure that the electric motor 50 is supplied with liquid, the pump arrangement comprises a venting channel 13 which fluidically connects the motor space 54 to the low-pressure region of the delivery chamber. The venting channel 13 and its profile are in particular shown in FIG. 2. The venting channel 13 comprises an intersection 14 at which the venting channel 13 emerges into the motor space 54. As shown in FIG. 1 and / or FIG. 2, the venting channel 13 emerges geodetically higher than the suction port 24 when the pump arrangement is used as intended.

[0095] The venting channel 13 connects the low-pressure region of the delivery chamber fluidically to the motor space 54. Air trapped in the motor space 54 can be drained by the pump via the venting channel 13, such that the fluid level in the motor space 54 rises. The fluid level can in particular rise above the suction port 24 up to the intersection 14 of the venting channel 13, whereby a larger portion of the electric motor 50 can be cooled by the liquid. The fluid level in the motor space 54 can in particular be set at the height of the intersection 14 of the venting channel 13 in the motor space 54.

[0096] When the pump arrangement is used as intended, the venting channel 13 emerges into the motor space 54 geodetically higher than a lowest point in the motor space 54. When the pump arrangement is used as intended, the venting channel 13 in particular emerges into the motor space 54 in an upper half of the motor space 54 in the vertical direction. The venting channel 13 in particular emerges into the motor space 54 in an upper third and / or quarter of the motor space 54 in the vertical direction.

[0097] As can be seen from FIG. 2 and / or FIG. 3, the venting channel 13 is formed in the first chamber wall 11. In addition to the venting channel 13, a low-pressure pocket 12 which overlaps the low-pressure region of the delivery chamber is formed in the first chamber wall 11. The venting channel 13 emerges into the low-pressure pocket 12 at its end 15 which faces away from the intersection 14. The venting channel 13 in particular emerges into a region of the low-pressure pocket 12 which overlaps with a region of the delivery chamber in which a local pressure minimum exists when the pump arrangement is in operation. In this way, it is possible to ensure that the venting channel 13 effectively suctions air away from the motor space 54.

[0098] The venting channel 13 is embodied in the form of a groove which is open towards the second chamber wall 22. The venting channel 13 is at least partially overlapped, in particular delineated, by the second housing part 20 on the side which axially faces the delivery chamber. The venting channel 13 can in particular be produced together with the first chamber wall 11 and / or first housing part 10. The venting channel 13 can in particular be produced together with the first housing part 10 in an original-moulding method.

[0099] The low-pressure pocket 12 is formed as a cavity which is open towards the second chamber wall 22. As is evident from FIG. 1, the low-pressure pocket 12 is embodied in the form of a curved, in particular reniform cavity. When the pump arrangement is used as intended, the low-pressure pocket 12 is geodetically lower than the intersection 14 of the venting channel 13.

[0100] In addition to the low-pressure pocket 12, a pressure pocket 16 is formed in the first chamber wall 11. The pressure pocket 16 is likewise formed as a cavity in the first chamber wall 11 which is open towards the second chamber wall 22. The pressure pocket 16 has a curved, in particular reniform shape. When the pump arrangement is used as intended, the low-pressure pocket 12 is arranged geodetically lower than the pressure pocket 16.

[0101] The pressure pocket 16 is fluidically connected to the motor space 54 via a pressure channel 17. The pressure pocket 16 is in particular fluidically connected to a bearing portion 19 of the rotor shaft 53 via the pressure channel 17. The pressure pocket 16 is preferably fluidically connected to the motor space 54 via a pressure channel 17 which is formed in the second chamber wall 22. The pressure channel 17 emerges into a bearing portion 19 of a rotor shaft 53 of the electric motor 50 at least one pressure intersection 18. The pressure intersection 18 is preferably arranged geodetically lower than the intersection 14 of the venting channel 13 when the pump arrangement is used as intended. The liquid can leak into the motor space 54 from the pressure pocket 16 via the bearing portion 19.

[0102] In alternative embodiments, the pressure channel 17 can be omitted entirely, in particular since the electric motor 50 and / or the motor space 54 of the electric motor 50 is formed in the accommodating space in the present example embodiment and / or in particular since the motor space 54 corresponds to the accommodating space of the pump arrangement. In place of the pressure channel 17, the pressure pocket 16 can also be fluidically connected to the motor space 54 solely via an internal leak. Alternatively, the pressure channel 17 can for example also emerge directly into the motor space 54.

[0103] FIGS. 4 to 6 show the pump arrangement in accordance with a second example embodiment. The pump arrangement of the second example embodiment differs from the pump arrangement of the first example embodiment in particular in the installation environment of the pump arrangement. Unless otherwise mentioned or contradictory, the above statements also apply to the pump arrangement of the second example embodiment.

[0104] Unlike the pump arrangement of the first example embodiment, the pump arrangement of the second example embodiment is not embodied as a cartridge-type pump arrangement. As shown in FIG. 4, the pump arrangement of the second example embodiment is formed as a tandem pump, wherein a second pump which is not described in more detail is formed on the side of the delivery chamber which faces away from the motor 50, wherein the second pump is optional. The second housing part 20 could for example be formed, in an identical or similar way to the second housing part 20 of the first example embodiment, on the side of the delivery chamber which faces away from the electric motor 50.

[0105] If the second housing part 20 in accordance with the second example embodiment is configured in an identical or similar way to the second housing part 20 of the first example embodiment, the pump arrangement of the second example embodiment can also be formed as a cartridge-type pump arrangement.

[0106] The pump arrangement of the second example embodiment differs from the pump arrangement of the first example embodiment in particular in the configuration of the second housing part 20. The second housing part 20 forms an accommodating well in which the pump and in particular the delivery element 61, 62, the first housing part 10 and the electric motor 50 are arranged. The second housing part 20 surrounds the first housing part 10 and the electric motor 50 on the radially outer side. The first housing part 10 is accommodated in the second housing part 20, wherein the first housing part 10 and the second housing part 20 surround the delivery chamber on its end-facing sides and circumferentially, wherein the electric motor 50 is formed on the side of the first housing part 10 which faces away from the delivery chamber.

[0107] The accommodating well of the second housing part 20 simultaneously forms the motor space 54. The motor space 54 is preferably at least partially filled with the liquid delivered by the pump. The motor space 54 is delineated on a first end-facing side by the first housing part 10 and the second housing part 20. Alternatively, the motor space 54 can be delineated on its first end-facing side by the first housing part 10, which is accommodated in the second housing part 20, only. The motor space 54 is circumferentially delineated at least partially by a circumferential wall of the second housing part 20.

[0108] The pump arrangement of the second example embodiment also comprises a motor cover 30 which closes off the accommodating well of the second housing part 20, wherein the motor cover 30 delineates the motor space 54 on the second end-facing side which faces away from the first end-facing side. A circumferential wall of the motor cover 30 protrudes at least partially into the accommodating well and also at least partially delineates the motor space 54 circumferentially. The motor cover 30 in particular closes off the accommodating well of the second housing part 20 in a fluid-tight seal.

[0109] It will be self-evident to the person skilled in the art that the pump arrangement of the second example embodiment need not be accommodated in an accommodating space by the motor space 54 delineated by the second housing part 20 and the motor cover 30. However, the pump arrangement of the second example embodiment can also be accommodated in an accommodating space.

[0110] The pump arrangement of the second example embodiment likewise comprises a venting channel 13 which connects a low-pressure region of the delivery chamber to the motor space 54, wherein the intersection 14 of the venting channel 13 emerges in an upper half of the motor space 54 in the vertical direction. The intersection 14 of the venting channel 13 in particular emerges in an upper third and / or quarter of the motor space 54 in the vertical direction. In addition, the intersection 14 of the venting channel 13 emerges geodetically higher than the suction port 24.

[0111] Unlike the first example embodiment, the pump arrangement of the second example embodiment does not comprise a pressure channel 17 which connects the pressure pocket 16 to the motor space 54. The motor space 54 can in particular be supplied with liquid by the pump via an internal leak, for example via the bearing portion 19 or sealing gaps. Alternatively, the motor space 54 can also be supplied via an external conduit.

[0112] Both the pump arrangement of the first example embodiment and the pump arrangement of the second example embodiment comprise an electronics space on the side of the motor cover 30 which faces away from the motor space54. The electronics space is closed off, in particular in a fluid-tight seal, by an electronics cover 40. The controller for the electric motor 50 can in particular be formed in the electronics space.

Examples

Embodiment Construction

[0080]FIGS. 1 to 3 show a pump arrangement for supplying a machine assembly 70 with liquid in accordance with a first example embodiment. The first example embodiment shall be described in more detail below on the basis of FIGS. 1 to 3. FIG. 1 shows an axial cross-section through the pump arrangement. FIG. 2 shows an axial plan view onto the first housing part 10 of the first example embodiment FIG. 3 shows an axial cross-section through the first housing part 10.

[0081]The pump arrangement in accordance with the first example embodiment is embodied as a cartridge-type pump arrangement. The pump arrangement is at least partially accommodated in an accommodating space. In accordance with the first example embodiment, the accommodating space is formed by the assembly housing 70 of the machine assembly to be supplied. The accommodating space is cup-shaped, comprising an end-facing wall which faces the pump arrangement and a circumferential wall which surrounds the pump arrangement circu...

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims priority to German Application No. 10 2025 112 593.7, filed Mar. 31, 2025, the contents of such application being incorporated by reference herein.FIELD OF THE INVENTION

[0002] The invention relates to a pump arrangement for supplying a machine assembly with fluid, in particular a liquid. The invention relates in particular to a pump arrangement for supplying a motor and / or a transmission of a motor vehicle. The fluid, in particular the liquid, can for example be oil for lubricating and / or cooling the machine assembly. The liquid can in particular be water, a glycol mixture or a dielectric liquid. The pump arrangement can in particular comprise a pump having a pump housing, wherein the pump housing preferably has at least one suction port and pressure port. A delivery chamber is formed in the pump housing, wherein a delivery element for delivering the fluid, in particular the liquid, from the suction port to the pressure port is arranged in the delivery chamber.

[0003] The pump arrangement can also comprise a drive, in particular an electric motor, for driving the delivery element, wherein the drive is preferably formed in a motor space. The drive can in particular be a wet-running electric motor, wherein liquid for lubricating and / or cooling the electric motor is situated in the motor space. The liquid situated in the motor space is preferably the liquid to be delivered by the pump. The motor space can in particular be fluidically connected to the delivery chamber.BACKGROUND OF THE INVENTION

[0004] In such pump arrangements comprising a pump and an electric motor, the motor space is typically cooled and / or lubricated using liquid delivered by the pump. A compromise therefore has to be found between a sufficient fluid connection between the delivery chamber and the motor space and the effectiveness of the pump arrangement.

[0005] If the fluid connection is insufficient, the fluid level (in particular, the liquid level) in the motor space can then remain too low, such that an air bubble is formed in the motor space. The components of the electric motor can then in particular be insufficiently supplied with fluid when in operation. A larger fluid connection, however, lowers the effectiveness of the pump arrangement, and the pump arrangement has to be designed with correspondingly larger dimensions in order to supply the machine assembly.

[0006] When the pump is at rest, a drop in the fluid level in the motor space can occur. The liquid can in particular flow from the motor space back into a reservoir while the pump is at rest. If the liquid is an oil, it can for example flow into an oil sump formed below the pump arrangement. As the liquid drains into the reservoir, the fluid level in the motor space drops and can be partially or entirely below the electric motor and / or its components, whereby at most only some of the motor is then immersed in the liquid.

[0007] If the fluid level in the motor space is low, the electric motor may run unwetted for a time when it is restarted, until the motor space and therefore the electric motor is sufficiently supplied with liquid by the pump which is driven by the electric motor. This can significantly restrict the heat dissipation and / or lubrication of the electric motor. The electric motor can then become overheated and / or worn.

[0008] This problem also occurs in cartridge-type pump arrangements which typically deliver the liquid from an accommodating space in which the pump arrangement itself and the electric motor are arranged, wherein the accommodating space can directly form the motor space, or the pump arrangement is arranged in the accommodating space together with a housing which forms the motor space.

[0009] As described, a drop in the fluid level in the accommodating space can occur when the pump is at rest. The liquid can flow from the accommodating space back into a reservoir while the pump is at rest. The fluid level can then drop to below a critical height, such that the suctioning point of the pump, in particular the suction port of the pump, is partially or entirely above the remaining fluid level.

[0010] The pump, when restarted, then initially suctions air or an air-liquid mixture, since there is little or no liquid situated in the region of the suctioning point. In the course of the suctioning process, the air is displaced by the inflowing liquid, whereby the fluid level gradually rises again, until the suctioning point is again covered by the liquid. An air bubble can nonetheless remain in the accommodating space above the fluid level.

[0011] The height of the fluid level and the extent of the air bubble remaining are then dependent inter alia on the installed location and geodetic height of the suctioning point. In unfavourable installation environments, the air bubble can be large, whereby the electric motor is only partially surrounded by liquid for an extended period of time. Suctioning air or the air-fluid mixture can also cause the electric motor to be insufficiently supplied with liquid. The electric motor can then become overhead and / or worn, thus making the pump arrangement more susceptible to faults, which can significantly reduce the service life of the pump arrangement.SUMMARY OF THE INVENTION

[0012] An aspect of the invention aims to provide a pump arrangement in which supplying the electric motor with fluid, in particular liquid, is improved.

[0013] An aspect of the invention relates to a pump arrangement for supplying a machine assembly with fluid, in particular liquid. An aspect of the invention relates in particular to a pump arrangement for supplying a motor and / or transmission of a motor vehicle. The liquid can be a liquid for cooling and / or lubricating the machine assembly. The liquid can for example be an oil, water, a glycol mixture and / or a dielectric liquid for supplying the machine assembly. The liquid can in particular be a liquid for cooling and / or lubricating a drive and / or transmission of a motor vehicle.

[0014] The pump arrangement comprises a pump having a pump housing. The pump can be a rotary pump. The pump can for example be formed by an internal gear pump, a vane pump, a pendulum-slider pump or an external gear pump.

[0015] The pump housing preferably has a suction port and a pressure port. A “pump housing” is in particular to be understood to mean the external housing of the pump which protects and encloses the internal components of the pump. Internal components can for example include delivery chambers, delivery elements such as for example rotors, contour rings, drive shafts, bearings, valves and / or gaskets, etc. The liquid can be channelled from the suction port to the pressure port via the pump housing.

[0016] A “suction port” is to be understood to mean a connection and / or opening on the pump housing via which the liquid to be delivered enters the pump housing. It can be a port on the suction side of the pump housing and / or pump, via which the liquid is suctioned by the negative pressure generated by the pump, wherein the word “port” is not to be understood restrictively, i.e. the suction port can for example emerge into the environment of the pump arrangement. Alternatively, the suction port can be connected to an assembly housing of the machine assembly to be supplied and / or to a reservoir for storing the fluid. The suction port can for example be connected to a port of the assembly housing and / or reservoir.

[0017] A “pressure port” is to be understood to mean a connection and / or opening on the pump housing via which the liquid to be delivered exits the pump housing. It can be a port on the pressure side of the pump housing and / or pump, via which the liquid can flow out due to the positive pressure generated by the pump, wherein the word “port” is not to be understood restrictively, i.e. the pressure port can for example emerge into the environment of the pump arrangement. The pressure port is preferably connected to an assembly housing of the machine assembly to be supplied. The pressure port can for example be connected to a port of the assembly housing.

[0018] A delivery chamber is preferably formed in the pump housing. The delivery chamber has a low-pressure region and a high-pressure region. The low-pressure region is preferably connected, in particular fluidically, to the suction port. The high-pressure region is preferably connected, in particular fluidically, to the pressure port. The pump housing can comprise a first housing part and a second housing part. The first housing part and the second housing part can delineate the delivery chamber circumferentially and / or axially on its end-facing sides.

[0019] A “delivery chamber” is in particular to be understood to mean the internal region of the pump housing in which the liquid is actually pumped, i.e. in which mechanical energy is transmitted to the liquid by at least one delivery element. The liquid is suctioned, compressed and / or delivered in the delivery chamber. The delivery chamber contains the active delivery mechanisms of the pump, such as for example rotors, vanes, impellers or pistons, which move the liquid. It is the region of the pump housing in which the liquid is delivered from a delivery chamber inlet in the low-pressure region to a delivery chamber outlet in the high-pressure region.

[0020] The pump arrangement also comprises a delivery element for delivering the liquid, in particular from the suction port towards the pressure port. The delivery element is formed in the delivery chamber. The delivery element can for example be a rotary-driven rotor. The delivery element can in particular be formed from an externally toothed gear and an internally toothed gear ring which mesh with each other. Alternatively, the delivery element can be a rotor comprising vanes which can be shifted, in particular radially.

[0021] The pump arrangement also comprises a drive for driving the delivery element. The drive is preferably formed by an electric motor. The drive can in particular be a wet-running electric motor. The drive is preferably arranged in a motor space. The delivery element can be rotary-driven via a rotor shaft of the electric motor. The delivery element can be non-rotationally connected to the rotor shaft. In addition, the delivery element can be connected, secured against shifting in the axial direction, to the rotor shaft. Alternatively, the delivery element can be able to move freely in the axial direction on the rotor shaft.

[0022] The drive, in particular the electric motor, can comprise a rotating part, in particular a rotor, and a fixed part, in particular a stator. The electric motor can be an internal-rotor motor or an external-rotor motor. The stator can in particular surround the rotor at least partially on the radially outer side. The stator can in particular surround the rotor completely on the radially outer side. Alternatively, the rotor can surround the stator at least partially on the radially outer side. The rotor can in particular surround the stator completely on the radially outer side.

[0023] A “wet-running electric motor” is in particular understood to mean an electric motor in which the components are partially or entirely surrounded by a liquid, at least when the electric motor is in operation. The liquid can preferably be the liquid delivered by the pump for supplying the machine assembly. The liquid serves in particular to lubricate bearings and / or moving parts of the electric motor and / or to cool the electrical and mechanical components of the electric motor. The motor space is preferably at least partially filled with the liquid delivered by the pump for supplying the machine assembly, when the pump arrangement is in operation. Preferably, at least 50% and in particular at least 70% of the motor is surrounded by liquid when the pump arrangement is in operation.

[0024] The pump arrangement, in particular the pump and the drive, can be embodied in the form of a module, wherein the term “module” is to be understood to mean a self-contained functional unit which performs a particular task or function within an overall system. Within the context of the pump arrangement, this means in particular that the pump and the drive are preferably combined with each other and designed such that they together form a compact prefabricated sub-assembly. This sub-assembly can for example be arranged as a complete unit in or on the machine assembly to be supplied.

[0025] The pump arrangement can in particular be embodied as a cartridge-type pump arrangement, such that the pump and the associated drive can be arranged and / or formed together in an accommodating space, wherein the accommodating space can simultaneously form the motor space of the drive. Alternatively, the pump arrangement can be arranged and / or formed in the accommodating space together with the motor space which is formed by a housing of the pump arrangement. The pump arrangement need not be embodied as a cartridge-type pump arrangement. The pump arrangement can for example be designed to be fastened to an assembly housing of the machine assembly.

[0026] The motor space can be formed by a housing of the pump arrangement. The motor space can in particular be directly integrated in the housing of the pump arrangement. The housing of the pump arrangement can completely enclose the motor space. The housing can ensure that the drive is separated from an external environment of the pump arrangement and that the liquid is held in the motor space. The motor space can be an integrated volume within the housing of the pump arrangement, in which the drive and the liquid are situated.

[0027] Alternatively, the motor space can be formed by an accommodating space of the pump arrangement, in which the pump arrangement is arranged. The motor space can in particular be formed by an external accommodating space in which the overall pump arrangement, including the pump together with the pump housing and the drive, can be arranged. The drive is then not or is only partially surrounded by the housing of the pump arrangement.

[0028] This accommodating space can for example form part of the machine assembly or a reservoir in which the liquid is stored. The accommodating space can for example be formed by the machine assembly to be supplied. The accommodating space can in particular be a cavity in an assembly housing of the machine assembly. The accommodating space can for example be cup-shaped, comprising an end-facing wall and a circumferential wall.

[0029] If the pump arrangement is arranged in the accommodating space, the pump arrangement can close off the accommodating space. The pump arrangement can in particular close off the accommodating space on a side which faces away from the end-facing wall. The pump arrangement preferably closes off the accommodating space in a fluid-tight seal.

[0030] At least one venting channel is preferably formed in the pump housing. The venting channel can connect the low-pressure region of the delivery chamber fluidically to the motor space. The venting channel comprises at least one intersection at which the venting channel emerges into the motor space. This intersection can be a first intersection, wherein the venting channel can for example comprise a second intersection at which the venting channel emerges into the motor space at a point spaced apart from the first intersection. The second intersection can be geodetically and / or axially and / or circumferentially spaced apart from the first intersection.

[0031] When the pump arrangement is used as intended, the intersection is preferably formed geodetically higher than the suction port. If the intersection is a first intersection, the first intersection and for example the second intersection are preferably both formed geodetically higher than the suction port. The first intersection and the second intersection preferably have the same geodetic height. The first intersection and the second intersection can then for example be spaced apart from each other axially and / or in the circumferential direction of the motor space. Alternatively, the first intersection can for example be arranged geodetically lower than the second intersection.

[0032] When the pump arrangement is used as intended, the intersection is preferably formed geodetically higher than the pressure port. If the intersection is a first intersection, the first intersection and for example the second intersection are preferably both formed geodetically higher than the pressure port. When the pump arrangement is used as intended, the intersection can in particular be formed geodetically higher than the delivery chambers of the pump. If the intersection is a first intersection, the first intersection and for example the second intersection are preferably both formed geodetically higher than the delivery chambers of the pump.

[0033] When the pump arrangement is used as intended, the intersection is preferably formed geodetically higher than the rotor of the electric motor and / or the stator. If the intersection is a first intersection, the first intersection and for example the second intersection are preferably both formed geodetically higher than the rotor of the electric motor and / or the stator.

[0034] If the electric motor is an internal-rotor motor, i.e. the stator surrounds the rotor on the radially outer side, the first intersection and preferably the second intersection, if present, can be formed at the geodetic height of the stator. The first intersection and preferably the second intersection, if present, can in particular be formed in a geodetically upper region of the stator. The first intersection and preferably the second intersection, if present, can in particular be formed geodetically higher than the rotor.

[0035] If the electric motor is an external-rotor motor, i.e. the rotor surrounds the stator on the radially outer side, the first intersection and preferably the second intersection, if present, can be formed at the geodetic height of the rotor. The first intersection and preferably the second intersection, if present, can in particular be formed in a geodetically upper region of the rotor. The first intersection and preferably the second intersection, if present, can in particular be formed geodetically higher than the stator.

[0036] The venting channel preferably serves to remove air and / or excess gas from the motor space. Air and / or excess gas which is trapped in the motor space can in particular be channelled away by the venting channel. By connecting the motor space to the low-pressure region, air or excess gas can be actively suctioned away from the motor space. Air can in particular be suctioned away from the motor space via the venting channel. In this way, the fluid level in the motor space can be geodetically higher than for example the suction port and / or the pressure port and / or the delivery chamber of the pump. The fluid level, in particular the liquid level, can in particular rise far enough that at least 50% and preferably at least 70% of the motor is surrounded by liquid when the pump arrangement is in operation.

[0037] The fluid level can in particular rise far enough that it is at least in an upper third of the drive, preferably in an upper quarter of the drive. The fluid level can particularly preferably rise far enough that the fluid level is geodetically higher than the drive.

[0038] The venting channel can in particular ensure that the motor space can be filled as completely as possible with liquid without trapped air impairing the function of the pump and / or the cooling of the motor. The venting channel can preferably ensure that at least 50% and in particular at least 70% of the motor space can be filled with liquid when the pump arrangement is in operation. Air situated in the motor space can for example be drained towards the delivery chamber via the venting channel when the pump arrangement is in operation, such that the motor space can be optimally filled with liquid.

[0039] The motor space is at least partially filled with liquid when the pump arrangement is in operation. The motor space can in particular be filled with the liquid delivered by the pump when in operation. The height of the fluid level of the fluid situated in the motor space can preferably be set at the height of the intersection between the venting channel and the motor space when the pump arrangement is in operation, i.e. the higher the venting channel emerges into the motor space, the higher the fluid level which is preferably set in the motor space when the pump arrangement is in operation.

[0040] When the pump arrangement is used as intended, the venting channel preferably emerges into the motor space geodetically higher than a lowest point in the motor space and / or a lowest point of the suction port. When the pump arrangement is used as intended, the venting channel preferably emerges into the motor space in an upper half of the motor space in the vertical direction. When the pump arrangement is used as intended, the venting channel can in particular emerge into the motor space in an upper third of the motor space in the vertical direction. When the pump arrangement is used as intended, the venting channel preferably emerges into the motor space in an upper quarter of the motor space in the vertical direction.

[0041] The delivery chamber can be delineated on a first end-facing side by a first chamber wall and on the second end-facing side which faces away from the first chamber wall by a second chamber wall. The first chamber wall and the second chamber wall can in particular delineate the delivery chamber on its end-facing sides. The first chamber wall can be formed by the first housing part of the pump housing, and the second chamber wall can be formed by the second housing part of the pump housing. The first chamber wall can in particular be formed by an end-facing wall of the first housing part which delineates the delivery chamber on the first end-facing side. The second chamber wall can in particular be formed by an end-facing wall of the second housing part which delineates the delivery chamber on the second end-facing side.

[0042] A low-pressure pocket which overlaps the low-pressure region of the delivery chamber can be formed in the first chamber wall. The low-pressure pocket can at least partially overlap the low-pressure region of the delivery chamber in an axial plan view onto the first chamber wall. A “low-pressure pocket” is to be understood to mean a specific region in the first chamber wall of the delivery chamber, which in particular serves as an equalising opening. This opening can fluidically connect at least one first delivery cell to a circumferentially adjacent second delivery cell, bypassing the delivery element, such that liquid can flow from the first delivery cell into the second delivery cell.

[0043] The low-pressure pocket can be formed as a cavity in the first chamber wall of the delivery chamber which is open towards the second chamber wall. The low-pressure pocket can have a curved, in particular reniform shape. Alternatively, however, the low-pressure pocket can also be embodied in the form of a groove which extends in the circumferential direction of the delivery chamber.

[0044] The low-pressure pocket can in particular be formed on the end-facing side of the delivery chamber which faces axially away from the delivery chamber inlet. The delivery chamber inlet, via which the liquid flows from the suction port into the delivery chamber, can in particular be formed in the second chamber wall. The delivery chamber inlet can be embodied in the form of a suction pocket. The suction pocket and the low-pressure pocket can in particular at least partially overlap each other. The suction pocket and the low-pressure pocket can in particular be congruent. The suction pocket and the low-pressure pocket can be designed to suction away liquid.

[0045] The low-pressure pocket and / or the suction pocket can be fluidically connected to the motor space. The low-pressure pocket and / or the suction pocket can in particular be fluidically connected to the motor space via the venting channel. The venting channel can be formed in the first chamber wall or the second chamber wall. The venting channel can in particular be embodied in the form of a groove in the first chamber wall which is open towards the second chamber wall, or the venting channel can be embodied in the form of a groove in the second chamber wall which is open towards the first chamber wall. The venting channel is preferably formed in the first chamber wall. Alternatively, the venting channel can also be embodied in the form of a passage, for example a passage bore, in the first chamber wall, the second chamber wall and / or a circumferential wall of the delivery chamber.

[0046] If the venting channel is formed by a groove which is open towards the second chamber wall, the venting channel can be delineated by the delivery element and / or the second housing part, at least in portions, on the side which faces the second chamber wall. The delivery element and / or the second housing part can in particular at least partially overlap the venting channel in an axial plan view onto the first chamber wall. This applies analogously if the venting channel is embodied in the form of a groove which is open towards the first chamber wall.

[0047] The venting channel can in particular extend, at least in portions, in a contact region between the first housing part and the second housing part. The venting channel can for example be formed in an end-facing side of the first housing part which axially faces the second housing part and can be axially delineated by an end-facing side of the second housing part which axially faces the first housing part. Alternatively, the venting channel can be formed at least partially in the end-facing side of the second housing part which axially faces the first housing part.

[0048] The venting channel can be produced together with the first chamber wall; the venting channel can in particular be produced together with the first chamber wall in an original-moulding method. If the first chamber wall is formed by the first housing part, the venting channel can be produced together with the first housing part; the venting channel can in particular be produced together with the first housing part in an original-moulding method.

[0049] Alternatively, the venting channel can be produced latterly. The venting channel can for example be latterly produced in a machining method. The venting channel can in particular be milled into the first chamber wall or, respectively, the end-facing side of the first housing part which forms the first chamber wall and / or can be drilled through the first chamber wall or, respectively, the first housing part.

[0050] The venting channel can have a circular, oval or rectangular cross-section. The size of the cross-section is preferably designed such that it is sufficiently large to quickly drain air bubbles, but small enough to not needlessly reduce the effectiveness of the pump.

[0051] The venting channel can extend at least partially outside the delivery chamber in an axial plan view onto the first chamber wall. The venting channel can in particular extend at least partially outside the delivery chamber in the radial direction. The venting channel can at least partially surround the delivery chamber circumferentially.

[0052] The venting channel can emerge into the low-pressure pocket at its end which faces away from the intersection. The venting channel can in particular extend from the low-pressure pocket up to the intersection at which the venting channel emerges into the motor space. The venting channel can in particular emerge into the low-pressure pocket at its end which faces away from the intersection, at an end portion of the low-pressure pocket which is upstream in the circumferential direction of the delivery chamber, wherein “upstream” refers to the delivery direction in the delivery chamber. The venting channel can in particular emerge into a region of the low-pressure pocket which overlaps with a region of the delivery chamber in which a local pressure minimum exists when the pump arrangement is in operation.

[0053] A pressure pocket which overlaps the high-pressure region of the delivery chamber can be formed in the first chamber wall. The pressure pocket can at least partially overlap the high-pressure region of the delivery chamber in an axial plan view onto the second chamber wall. A “pressure pocket” is to be understood to mean a specific region in the first chamber wall of the delivery chamber, which in particular serves as an equalising opening. This opening can fluidically connect at least one first delivery cell to a circumferentially adjacent second delivery cell, such that liquid can flow from the first delivery cell into the second delivery cell.

[0054] The pressure pocket can be formed as a cavity in the first chamber wall of the delivery chamber which is open towards the second chamber wall. The pressure pocket can have a curved, in particular reniform shape. Alternatively, however, the pressure pocket can also for example be embodied in the form of a groove which extends in the circumferential direction of the delivery chamber.

[0055] The pressure pocket can in particular be formed on the end-facing side of the delivery chamber which faces away from the delivery chamber outlet. The delivery chamber outlet, via which the liquid flows from the delivery chamber towards the pressure port, can in particular be formed in the second chamber wall. The delivery chamber outlet can be embodied in the form of a second pressure pocket. The pressure pocket can then be referred to as the first pressure pocket. The first pressure pocket and the second pressure pocket can in particular at least partially overlap each other. The first pressure pocket and the second pressure pocket can in particular be congruent.

[0056] The pressure pocket, in particular the first pressure pocket, can be fluidically connected to the motor space. The pressure pocket is in particular fluidically connected to the motor space via an internal leak and / or a pressure channel. This means that liquid can flow directly or indirectly from the pressure pocket towards the motor space. An “indirect fluidic connection” is in particular to be understood to mean the internal leak within the pump arrangement. A “direct fluidic connection” is in particular to be understood to mean the fluidic connection via the pressure channel, via which liquid can specifically flow from the delivery chamber.

[0057] An “internal leak” is in particular to be understood to mean the transition of liquid within the system through small gaps or sealing surfaces within the pump arrangement. The leak can be used to guide liquid into the motor space without a separate channel being required for this purpose. The pressure channel, however, is a specifically designed conduit within the pump arrangement which channels the liquid from the pressure pocket towards the motor space.

[0058] If the pressure pocket is fluidically connected to the motor space via a pressure channel, the pressure channel can emerge into the motor space or a bearing portion of the rotor shaft of the electric motor at at least one pressure intersection. If the pressure channel emerges at its pressure intersection into a bearing portion of the rotor shaft, the liquid can flow towards the motor space via an internal leak. The liquid can in particular flow along the bearing portion towards the motor space. When the pump arrangement is used as intended, the pressure intersection can in particular be arranged geodetically lower than the intersection of the venting channel.

[0059] When the pump arrangement is used as intended, the low-pressure pocket and / or the delivery chamber inlet is / are preferably arranged geodetically lower than the pressure pocket and / or the delivery chamber outlet. The low-pressure pocket and / or the delivery chamber inlet can in particular overlap the circumferentially lowest region of the delivery chamber.

[0060] The pump housing can comprise the first housing part and the second housing part. The electric motor is preferably arranged on a side of the first housing part which faces away from the delivery chamber and / or the second housing part. The first housing part can in particular be formed between the delivery chamber and the motor space. The first housing part can for example fluidically separate the motor space from the delivery chamber. The first housing part can be arranged between the second housing part and the motor space.

[0061] The first housing part can form the bearing portion for the rotor shaft of the electric motor. A passage for the rotor shaft of the electric motor can in particular be formed in the first housing part. The rotor shaft can be directly or indirectly mounted in the passage. A bearing socket for the rotor shaft can in particular be arranged in the passage.

[0062] As described above, the first housing part can form the first chamber wall. The first housing part and the second housing part can delineate the delivery chamber circumferentially and / or on its end-facing sides. Alternatively, the first housing part and the second housing part can delineate a pump space circumferentially and / or on its end-facing sides, wherein a contour ring and / or pressure plates which delineate the delivery chamber circumferentially and / or on its end-facing sides can for example be additionally formed in the pump space.

[0063] The suction port is preferably formed on a side of the pump housing which faces away from the electric motor and / or the motor space. The suction port can in particular be formed on the second housing part. The suction port can be formed on an end-facing side or on a circumferential side of the pump housing.

[0064] The pressure port is preferably formed on a side of the pump housing which faces away from the electric motor and / or the motor space. The pressure port can in particular be formed on the second housing part. The pressure port can be formed on an end-facing side or on a circumferential side of the pump housing.

[0065] The first housing part and / or the second housing part can delineate the delivery chamber axially on its end-facing sides and circumferentially. The first housing part can in particular for example delineate the delivery chamber axially on one end-facing side, while the second housing part delineates the delivery chamber axially on one end-facing side and circumferentially.

[0066] The end-facing side of the second housing part which axially faces the first housing part, and the end-facing side of the first housing part which axially faces the second housing part, can preferably be in direct contact. It is in particular possible for no other housing parts to be formed between the first housing part and the second housing part. In alternative embodiments, a third housing part can for example be formed between the first housing part and the second housing part. The third housing part can for example be designed to delineate the delivery chamber circumferentially, while the first housing part and the second housing part delineate the delivery chamber axially on its end-facing sides. If, for example, the pump housing comprises a third housing part, the venting channel can be formed between the first housing part and the third housing part, instead of the second housing part as described above.

[0067] The pump arrangement can comprise a motor cover in addition to the pump housing, in particular in addition to the first housing part and the second housing part. The motor cover can delineate and in particular close off the motor space on a side which faces away from the delivery chamber. The motor cover can in particular close off the motor space in a fluid-tight seal. If the pump arrangement is arranged in the accommodating space, the motor cover can close off the accommodating space on the side opposite the end-facing wall of the accommodating space.

[0068] The motor cover can delineate the motor space circumferentially and / or on its end-facing sides. The motor cover together with the first housing part and / or the second housing part of the pump housing can for example at least partially delineate the motor space circumferentially and / or on its end-facing sides. The first housing part, the second housing part and the motor cover can form part of the housing of the pump arrangement.

[0069] If the pump arrangement is not designed to be arranged in an accommodating space, the motor space is delineated circumferentially and on its end-facing sides, in particular in a fluid-tight seal, by the housing of the pump arrangement. The motor space can also be delineated circumferentially and on its end-facing sides by the housing of the pump arrangement if the pump arrangement is designed to be accommodated in the accommodating space. The motor space is not then formed by the accommodating space.

[0070] The second housing part can form an accommodating well in which the pump, the first housing part and the electric motor can be arranged. The first housing part and / or the electric motor can in particular be surrounded on the radially outer side by the second housing part. A circumferential wall of the second housing part can in particular protrude from the first housing part towards the electric motor and delineate the motor space circumferentially. The motor cover can preferably protrude at least partially into the motor space in order to delineate the motor space on the side which faces away from the first housing part.

[0071] The pump arrangement can have an assembling structure by means of which the pump arrangement can be assembled at an accommodating point or in the accommodating space. The pump arrangement can in particular be connected to or assembled near a consumer via the assembling structure. The consumer can for example be the machine assembly to be supplied. The assembling structure preferably protrudes from the housing of the pump arrangement on the radially outer side. The assembling structure can for example be formed by the motor cover and / or the pump housing, for example the second housing part.BRIEF DESCRIPTION OF THE DRAWINGS

[0072] An aspect of the invention is described below on the basis of example embodiments. Features disclosed by the example embodiments advantageously develop the subject matter of the claims and also the embodiments described above.

[0073] There is shown:

[0074] FIG. 1 an axial cross-section through the pump arrangement in accordance with a first example embodiment;

[0075] FIG. 2 an axial plan view onto a first housing part of a first example embodiment;

[0076] FIG. 3 an axial cross-section through the first housing part of the first example embodiment;

[0077] FIG. 4 an axial cross-section through the pump arrangement in accordance with a second example embodiment;

[0078] FIG. 5 an axial plan view onto a first housing part of a second example embodiment;

[0079] FIG. 6 an axial plan view onto the first housing part and a delivery element of the second example embodiment.DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS

[0080] FIGS. 1 to 3 show a pump arrangement for supplying a machine assembly 70 with liquid in accordance with a first example embodiment. The first example embodiment shall be described in more detail below on the basis of FIGS. 1 to 3. FIG. 1 shows an axial cross-section through the pump arrangement. FIG. 2 shows an axial plan view onto the first housing part 10 of the first example embodiment FIG. 3 shows an axial cross-section through the first housing part 10.

[0081] The pump arrangement in accordance with the first example embodiment is embodied as a cartridge-type pump arrangement. The pump arrangement is at least partially accommodated in an accommodating space. In accordance with the first example embodiment, the accommodating space is formed by the assembly housing 70 of the machine assembly to be supplied. The accommodating space is cup-shaped, comprising an end-facing wall which faces the pump arrangement and a circumferential wall which surrounds the pump arrangement circumferentially.

[0082] The pump arrangement of the first example embodiment comprises a pump and an electric motor 50 which is arranged in a motor space 54, wherein the motor space 54 is formed by the accommodating space in which the pump arrangement is formed. The motor space 54 is delineated on one end-facing side by a motor cover 30. The motor space 54 is in particular closed off in a fluid-tight seal by the motor cover 30 on the side which faces away from the end-facing side, i.e. the pump arrangement closes off the accommodating space on the side which faces away from the end-facing side. The pump arrangement in particular closes off the accommodating space in a fluid-tight seal.

[0083] The pump arrangement also has an assembling structure. The pump arrangement can for example be able to be fastened to the machine assembly 70 via the assembling structure. In accordance with the present example embodiment, the assembling structure is formed by the motor cover 30.

[0084] The pump of the pump arrangement comprises a pump housing 10, 20 having a suction port 24 and a pressure port 23. In the present example embodiment, the pump housing comprises a first housing part 10 and a second housing part 20, wherein the suction port 24 and the pressure port 23 are formed facing the end-facing wall of the accommodating space. The suction port 24 and the pressure port 23 are in particular formed by the second housing part. The pressure port 23 is connected, in particular in a fluid-tight seal, to an assembly port which is formed in the end-facing wall of the accommodating space. The pressure port 23 protrudes in particular into the assembly port.

[0085] When the pump arrangement is in operation, the accommodating space is at least partially filled with the liquid delivered by the pump. The suction port 24 emerges into the accommodating space. When the pump arrangement is in operation, the pump suctions liquid from the accommodating space via the suction port 24 and discharges it again via the pressure port 23.

[0086] A delivery chamber, having a low-pressure region connected to the suction port 24 and a high-pressure region connected to the pressure port 23, is formed in the pump housing 10, 20. In the present case, the first housing part 10 and the second housing part 20 delineate the delivery chamber circumferentially and axially on its end-facing sides.

[0087] In the present example embodiment, the first housing part 10 forms a first chamber wall 11 which delineates the delivery chamber on a first end-facing side. The second housing part 20 forms a second chamber wall 22, which delineates the delivery chamber on a second end-facing side which faces away from the first end-facing side, and a circumferential wall which delineates the delivery chamber circumferentially.

[0088] This configuration is optional. It will be evident to the person skilled in the art that it is for example also possible for the first housing part 10 to delineate the delivery chamber circumferentially. Alternatively, the first housing part 10 and the second housing part 20 can for example also house pressure plates and / or a contour ring which respectively delineate the delivery chamber on its end-facing sides and circumferentially. The first chamber wall 11 and / or the second chamber wall 22 can in particular each be formed by a separate component.

[0089] A delivery element 61, 62 for delivering the fluid from the suction port 24 to the pressure port 23 is formed in the delivery chamber. The delivery element 61, 62 comprises a rotor 61 and a gear ring 62 which circumferentially surrounds the rotor 61. The rotor 61 is embodied in the form of an externally toothed gear which is arranged such that it meshes with the gear ring 62.

[0090] The delivery element 61, 62 is rotary-driven via a rotor shaft 53 of the electric motor 50. The rotor 61 is in particular rotary-driven by the rotor shaft 53, wherein the rotor 61 is non-rotationally connected to the rotor shaft 53. When the rotor 61 is rotated, the gear ring 62 is slaved by the rotor 61 and set in rotational motion. The rotor 61 can be connected to the rotor shaft 53 such that it is secured against shifting in the axial direction. Alternatively, the rotor 61 can be able to freely move in the axial direction on the rotor shaft 53.

[0091] The electric motor 50 is formed on the side of the first housing part 10 which faces away from the delivery chamber. The first housing part 10 comprises a bearing portion 19 in the form of a passage opening in which the rotor shaft 53 of the electric motor 50 is accommodated. The bearing portion 19 can directly mount the rotor shaft 53, as shown for example in FIG. 1. In alternative embodiments, the bearing portion 19 can for example also have a bearing socket in which the rotor shaft 53 is mounted.

[0092] When the pump arrangement and / or pump is at rest, the liquid may flow away from the accommodating space. When the pump arrangement is at rest, the liquid can in particular flow from the accommodating space back into a reservoir (not shown). The fluid level in the accommodating space and / or motor space 54 can then drop when the pump is at rest, such that the suction port 24 emerges into the accommodating space above the fluid level.

[0093] When the pump is restarted, air may initially be suctioned from the accommodating space via the suction port 24. Due to the negative pressure which arises in the accommodating space, the accommodating space is gradually refilled with liquid until the suction port 24 is again below the fluid level. However, the fluid level generally only rises up to and above the suction port 24, hence an air bubble can remain in the accommodating space. The motor 50 may then not be supplied with enough liquid to sufficiently cool it.

[0094] In order to ensure that the electric motor 50 is supplied with liquid, the pump arrangement comprises a venting channel 13 which fluidically connects the motor space 54 to the low-pressure region of the delivery chamber. The venting channel 13 and its profile are in particular shown in FIG. 2. The venting channel 13 comprises an intersection 14 at which the venting channel 13 emerges into the motor space 54. As shown in FIG. 1 and / or FIG. 2, the venting channel 13 emerges geodetically higher than the suction port 24 when the pump arrangement is used as intended.

[0095] The venting channel 13 connects the low-pressure region of the delivery chamber fluidically to the motor space 54. Air trapped in the motor space 54 can be drained by the pump via the venting channel 13, such that the fluid level in the motor space 54 rises. The fluid level can in particular rise above the suction port 24 up to the intersection 14 of the venting channel 13, whereby a larger portion of the electric motor 50 can be cooled by the liquid. The fluid level in the motor space 54 can in particular be set at the height of the intersection 14 of the venting channel 13 in the motor space 54.

[0096] When the pump arrangement is used as intended, the venting channel 13 emerges into the motor space 54 geodetically higher than a lowest point in the motor space 54. When the pump arrangement is used as intended, the venting channel 13 in particular emerges into the motor space 54 in an upper half of the motor space 54 in the vertical direction. The venting channel 13 in particular emerges into the motor space 54 in an upper third and / or quarter of the motor space 54 in the vertical direction.

[0097] As can be seen from FIG. 2 and / or FIG. 3, the venting channel 13 is formed in the first chamber wall 11. In addition to the venting channel 13, a low-pressure pocket 12 which overlaps the low-pressure region of the delivery chamber is formed in the first chamber wall 11. The venting channel 13 emerges into the low-pressure pocket 12 at its end 15 which faces away from the intersection 14. The venting channel 13 in particular emerges into a region of the low-pressure pocket 12 which overlaps with a region of the delivery chamber in which a local pressure minimum exists when the pump arrangement is in operation. In this way, it is possible to ensure that the venting channel 13 effectively suctions air away from the motor space 54.

[0098] The venting channel 13 is embodied in the form of a groove which is open towards the second chamber wall 22. The venting channel 13 is at least partially overlapped, in particular delineated, by the second housing part 20 on the side which axially faces the delivery chamber. The venting channel 13 can in particular be produced together with the first chamber wall 11 and / or first housing part 10. The venting channel 13 can in particular be produced together with the first housing part 10 in an original-moulding method.

[0099] The low-pressure pocket 12 is formed as a cavity which is open towards the second chamber wall 22. As is evident from FIG. 1, the low-pressure pocket 12 is embodied in the form of a curved, in particular reniform cavity. When the pump arrangement is used as intended, the low-pressure pocket 12 is geodetically lower than the intersection 14 of the venting channel 13.

[0100] In addition to the low-pressure pocket 12, a pressure pocket 16 is formed in the first chamber wall 11. The pressure pocket 16 is likewise formed as a cavity in the first chamber wall 11 which is open towards the second chamber wall 22. The pressure pocket 16 has a curved, in particular reniform shape. When the pump arrangement is used as intended, the low-pressure pocket 12 is arranged geodetically lower than the pressure pocket 16.

[0101] The pressure pocket 16 is fluidically connected to the motor space 54 via a pressure channel 17. The pressure pocket 16 is in particular fluidically connected to a bearing portion 19 of the rotor shaft 53 via the pressure channel 17. The pressure pocket 16 is preferably fluidically connected to the motor space 54 via a pressure channel 17 which is formed in the second chamber wall 22. The pressure channel 17 emerges into a bearing portion 19 of a rotor shaft 53 of the electric motor 50 at least one pressure intersection 18. The pressure intersection 18 is preferably arranged geodetically lower than the intersection 14 of the venting channel 13 when the pump arrangement is used as intended. The liquid can leak into the motor space 54 from the pressure pocket 16 via the bearing portion 19.

[0102] In alternative embodiments, the pressure channel 17 can be omitted entirely, in particular since the electric motor 50 and / or the motor space 54 of the electric motor 50 is formed in the accommodating space in the present example embodiment and / or in particular since the motor space 54 corresponds to the accommodating space of the pump arrangement. In place of the pressure channel 17, the pressure pocket 16 can also be fluidically connected to the motor space 54 solely via an internal leak. Alternatively, the pressure channel 17 can for example also emerge directly into the motor space 54.

[0103] FIGS. 4 to 6 show the pump arrangement in accordance with a second example embodiment. The pump arrangement of the second example embodiment differs from the pump arrangement of the first example embodiment in particular in the installation environment of the pump arrangement. Unless otherwise mentioned or contradictory, the above statements also apply to the pump arrangement of the second example embodiment.

[0104] Unlike the pump arrangement of the first example embodiment, the pump arrangement of the second example embodiment is not embodied as a cartridge-type pump arrangement. As shown in FIG. 4, the pump arrangement of the second example embodiment is formed as a tandem pump, wherein a second pump which is not described in more detail is formed on the side of the delivery chamber which faces away from the motor 50, wherein the second pump is optional. The second housing part 20 could for example be formed, in an identical or similar way to the second housing part 20 of the first example embodiment, on the side of the delivery chamber which faces away from the electric motor 50.

[0105] If the second housing part 20 in accordance with the second example embodiment is configured in an identical or similar way to the second housing part 20 of the first example embodiment, the pump arrangement of the second example embodiment can also be formed as a cartridge-type pump arrangement.

[0106] The pump arrangement of the second example embodiment differs from the pump arrangement of the first example embodiment in particular in the configuration of the second housing part 20. The second housing part 20 forms an accommodating well in which the pump and in particular the delivery element 61, 62, the first housing part 10 and the electric motor 50 are arranged. The second housing part 20 surrounds the first housing part 10 and the electric motor 50 on the radially outer side. The first housing part 10 is accommodated in the second housing part 20, wherein the first housing part 10 and the second housing part 20 surround the delivery chamber on its end-facing sides and circumferentially, wherein the electric motor 50 is formed on the side of the first housing part 10 which faces away from the delivery chamber.

[0107] The accommodating well of the second housing part 20 simultaneously forms the motor space 54. The motor space 54 is preferably at least partially filled with the liquid delivered by the pump. The motor space 54 is delineated on a first end-facing side by the first housing part 10 and the second housing part 20. Alternatively, the motor space 54 can be delineated on its first end-facing side by the first housing part 10, which is accommodated in the second housing part 20, only. The motor space 54 is circumferentially delineated at least partially by a circumferential wall of the second housing part 20.

[0108] The pump arrangement of the second example embodiment also comprises a motor cover 30 which closes off the accommodating well of the second housing part 20, wherein the motor cover 30 delineates the motor space 54 on the second end-facing side which faces away from the first end-facing side. A circumferential wall of the motor cover 30 protrudes at least partially into the accommodating well and also at least partially delineates the motor space 54 circumferentially. The motor cover 30 in particular closes off the accommodating well of the second housing part 20 in a fluid-tight seal.

[0109] It will be self-evident to the person skilled in the art that the pump arrangement of the second example embodiment need not be accommodated in an accommodating space by the motor space 54 delineated by the second housing part 20 and the motor cover 30. However, the pump arrangement of the second example embodiment can also be accommodated in an accommodating space.

[0110] The pump arrangement of the second example embodiment likewise comprises a venting channel 13 which connects a low-pressure region of the delivery chamber to the motor space 54, wherein the intersection 14 of the venting channel 13 emerges in an upper half of the motor space 54 in the vertical direction. The intersection 14 of the venting channel 13 in particular emerges in an upper third and / or quarter of the motor space 54 in the vertical direction. In addition, the intersection 14 of the venting channel 13 emerges geodetically higher than the suction port 24.

[0111] Unlike the first example embodiment, the pump arrangement of the second example embodiment does not comprise a pressure channel 17 which connects the pressure pocket 16 to the motor space 54. The motor space 54 can in particular be supplied with liquid by the pump via an internal leak, for example via the bearing portion 19 or sealing gaps. Alternatively, the motor space 54 can also be supplied via an external conduit.

[0112] Both the pump arrangement of the first example embodiment and the pump arrangement of the second example embodiment comprise an electronics space on the side of the motor cover 30 which faces away from the motor space54. The electronics space is closed off, in particular in a fluid-tight seal, by an electronics cover 40. The controller for the electric motor 50 can in particular be formed in the electronics space.

Examples

Embodiment Construction

[0080]FIGS. 1 to 3 show a pump arrangement for supplying a machine assembly 70 with liquid in accordance with a first example embodiment. The first example embodiment shall be described in more detail below on the basis of FIGS. 1 to 3. FIG. 1 shows an axial cross-section through the pump arrangement. FIG. 2 shows an axial plan view onto the first housing part 10 of the first example embodiment FIG. 3 shows an axial cross-section through the first housing part 10.

[0081]The pump arrangement in accordance with the first example embodiment is embodied as a cartridge-type pump arrangement. The pump arrangement is at least partially accommodated in an accommodating space. In accordance with the first example embodiment, the accommodating space is formed by the assembly housing 70 of the machine assembly to be supplied. The accommodating space is cup-shaped, comprising an end-facing wall which faces the pump arrangement and a circumferential wall which surrounds the pump arrangement circu...

Claims

1-15. (canceled)16. A pump arrangement for supplying a machine assembly with liquid, comprising:a. a pump comprising a pump housing which has a suction port and a pressure port;b. a delivery chamber which is formed in the pump housing and comprises a low-pressure region connected to the suction port and a high-pressure region connected to the pressure port;c. a delivery element, which is formed in the delivery chamber, for delivering a liquid from the suction port to the pressure port; andd. an electric motor, which is arranged in a motor space, for driving the delivery element;whereine. at least one venting channel which is formed in the pump housing fluidically connects the low-pressure region of the delivery chamber to the motor space, wherein the venting channel emerges into the motor space at at least one intersection which is arranged geodetically higher than the suction port when the pump arrangement is used as intended.

17. The pump arrangement according to claim 16, wherein the electric motor is a wet-running electric motor and the motor space is at least partially filled with the liquid to be delivered when the pump arrangement is in operation.

18. The pump arrangement according to claim 17, wherein the fluid level of the liquid situated in the motor space is situated at the height of the intersection of the venting channel.

19. The pump arrangement according to claim 16, wherein when the pump arrangement is used as intended, the venting channel emerges into the motor space in an upper third or in an upper quarter of the motor space in the vertical direction.

20. The pump arrangement according to claim 16, wherein the delivery chamber is delineated on a first end-facing side of the delivery chamber by a first chamber wall and on the second end-facing side of the delivery chamber which faces away from the first chamber wall by a second chamber wall, and wherein the venting channel is formed in the first chamber wall.

21. The pump arrangement according to claim 20, wherein a low-pressure pocket which overlaps the low-pressure region is formed in the first chamber wall, and the venting channel emerges into the low-pressure pocket at its end which faces away from the intersection.

22. The pump arrangement according to claim 21, wherein the venting channel emerges into a region of the low-pressure pocket which overlaps with a portion of the delivery chamber in which a local pressure minimum exists when the pump arrangement is in operation.

23. The pump arrangement according to claim 20, wherein the pump housing comprises a first housing part and a second housing part, and the first chamber wall is formed by the first housing part and / or the second chamber wall is formed by the second housing part.

24. The pump arrangement according to claim 20, wherein the venting channel formed in the first chamber wall is embodied in the form of a groove which is open towards the second chamber wall.

25. The pump arrangement according to claim 20, wherein a pressure pocket which overlaps the high-pressure region is formed in the first chamber wall, and the pressure pocket is fluidically connected to the motor space, and the pressure channel emerges into a bearing portion of a rotor shaft of the electric motor at at least one pressure intersection, and wherein the pressure intersection is arranged geodetically lower than the intersection of the venting channel when the pump arrangement is used as intended.

26. The pump arrangement according to claim 25, wherein the pressure pocket is fluidically connected to the motor space via a pressure channel which is formed in the second chamber wall,27. The pump arrangement according to claim 16, wherein the pump housing comprises a first housing part and a second housing part, and wherein the electric motor is arranged on a side of the first housing part which faces away from the delivery chamber.

28. The pump arrangement according to claim 16, wherein the suction port and / or the pressure port is / are formed on an end-facing side of the pump housing.

29. The pump arrangement according to claim 16, wherein the pump arrangement comprises a motor cover, and the motor cover closes off the motor space on a side which faces away from the delivery chamber.

30. The pump arrangement according to claim 16, wherein the pump arrangement comprises a motor cover, and whereina. an end-facing wall and a circumferential wall of the pump arrangement protrude at least partially into an accommodating space,b. and wherein the motor cover closes off the accommodating space on the side which faces away from the end-facing wall, and / orc. the motor space is delineated circumferentially and / or on its end-facing sides by the motor cover and the first housing part according to claim 12.

31. The pump arrangement according to claim 30, wherein the accommodating space is formed by an assembly housing of the machine assembly to be supplied with liquid.

32. The pump arrangement according to claim 30, wherein the accommodating space comprises the motor space.

33. The pump arrangement according to claim 16, wherein the pump arrangement comprises an assembling structure via which the pump arrangement can be connected to the machine assembly to be supplied.

34. The pump arrangement according to claim 33, wherein the pump arrangement comprises a motor cover, and the motor cover closes off the motor space on a side which faces away from the delivery chamber, and wherein the motor cover forms the assembling structure.

35. The pump arrangement according to claim 16, wherein the machine assembly is a motor and / or a transmission of a motor vehicle.

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