PUMP WITH AXIAL SAFETY DEVICE

Description

[0001] The invention relates to a pump, in particular a rotary pump, with a spring structure and in particular to the arrangement of the spring structure on the pump. Furthermore, the invention relates to the axial securing of the pump, in particular of the pump housing, for example, for transport of the pump and / or during its operation. In particular, the invention relates to the manner in which the spring structure and / or an end wall of the pump housing is held to the pump housing and in particular to a preassembled pump or assembly unit.

[0002] The pump can be used as a gear pump to supply a transmission, for example an automatic transmission or steering gear of a vehicle or a transmission of a wind turbine, with pressurized fluid. In another application, it can be used as a lubricating oil pump and / or coolant pump to supply an internal combustion engine and / or an electric motor, for example a drive motor of a vehicle, with lubricating oil and / or coolant. A combined use as a lubricating oil pump and / or coolant pump and additionally as a gear pump is also conceivable, particularly in designs in which the pump has multiple flow passages. A design as a vacuum pump is also conceivable. The pump can be single-flow or multi-flow, in particular multi-circuit. The pump can advantageously be designed as a cartridge.

[0003] Cartridge-type pumps are known from the prior art and can be inserted as an assembly unit into a receiving device, in particular into a receiving shaft, for example of a gearbox, such as EP 3 081 744 A1 and DE 10 2013 209877 A1. The axial securing of the pumps, in particular the axial securing of the pump housing, is generally achieved by press fits or by additional, externally accessible elements such as retaining rings. During assembly or disassembly of the pump, such axial securing devices generate dirt particles in the form of abrasion, which can cause damage to the pump during operation or, in the worst case, failure of the pump due to wear. In particular with press fits, non-destructive disassembly without damaging the surface and / or increasing the tolerance of the pump due to pressing is impossible.

[0004] In particular, spring structures for exerting an axial force on the pump housing are sometimes loosely inserted into the mounting shaft during assembly or installed within the pump housing, for example, between a housing cover and a peripheral wall. In the case where the spring structure is loosely inserted into the mounting shaft during assembly and is located in the gap between an end face of the pump housing and a connecting wall of the mounting device, the spring structure is held in position primarily by axial contact pressure.

[0005] This loose assembly of the spring structure can result in the spring structure not being optimally aligned with the end wall of the pump housing from an axial perspective, for example, exhibiting a radial offset to the pump housing and / or being inserted upside down when inserted into the receiving device, i.e., in the case of a circular spring structure, being rotated by 180° with the diameter as the axis of rotation. This can result in the compressive force exerted by the spring structure on the pump housing not being evenly transmitted into the pump housing, which can lead to malfunctions and leaks, particularly if the spring structure also has a sealing function between a pump outlet and a pressure connection of the receiving device.

[0006] It is therefore an object of the invention to axially secure the pump housing and / or the spring structure, in particular to axially secure it in a releasable manner.

[0007] The problem is solved by a pump according to claim 1.

[0008] A pump as pertaining to the invention comprises a pump housing with a delivery chamber radially surrounded by a peripheral wall. The pump housing comprises an inlet for the fluid on a low-pressure side and at least one outlet for the fluid on a high-pressure side, as well as a delivery element movable within the delivery chamber for delivering the fluid from the low-pressure side to the high-pressure side. The delivery element is preferably formed by a rotatable delivery rotor, for example, by a rotor of a vane pump with at least one vane.

[0009] If the pump is arranged in a pump circuit, the low-pressure side of the pump extends from a reservoir from which the pump draws the fluid, through the inlet, to at least one discharge chamber inlet. If the transition from low pressure to high pressure occurs in the discharge chamber, the low-pressure side of the pump also includes the low-pressure side of the discharge chamber, thus extending on the low-pressure side into the discharge chamber.

[0010] The high-pressure side of the pump comprises the high-pressure region extending within the pump housing, in particular including the high-pressure region of the delivery chamber, and further extends to at least the unit to be supplied with the fluid or, if the pump supplies multiple units with the fluid, to each of these units. If the pump is arranged in a housing of a unit to be supplied with pressurized fluid, in particular in a receiving device of the unit housing, the high-pressure side comprises the high-pressure region extending within the pump housing and the high-pressure region extending within the receiving device up to a pressure connection of the receiving device, through which the pressurized fluid flowing through the pump outlet can be discharged.

[0011] The delivery chamber is bounded in the axial direction by an end wall. At least one outlet for the fluid delivered from the delivery chamber opens out on an outer end side of the end wall facing away from the delivery chamber. The pump can comprise a seal provided for sealing the outlet on the outer end face of the end wall. The seal can have a sealing loop surrounding the outlet on the outer end face of the end wall. The seal, if present, is preferably designed as an axial seal. If the pump is designed with multiple flow, in particular with multiple circuits, the axial seal can serve in particular to fluidically separate the individual outlets.

[0012] The pump housing comprises the peripheral wall and the end wall as a first end wall. Furthermore, the pump housing comprises a further, second end wall arranged on the axial end side of the peripheral wall facing away from the first end wall. The first end wall or the second end wall can be formed integrally with the peripheral wall to form a housing pot. The first end wall or the second end wall can be joined to the peripheral wall or pre-formed, for example cast, and together form a housing pot. Preferably, the peripheral wall, the first end wall and the second end wall are separately manufactured components which are preferably pressed axially against one another in loose pressure contact. Preferably, the peripheral wall, the first end wall and the second end wall are held together axially by a securing device.

[0013] The pump comprises a spring structure for applying a pressure force to the pump housing. The pressure force serves, in particular, to press the peripheral wall, the first end wall, and / or the second end wall tightly against one another. The spring structure is arranged on the outer end face of the end wall. In the axial direction, the spring structure is preferably arranged on the first end wall of the pump housing, in particular on the outer end face of the first end wall facing away from the delivery chamber.

[0014] The spring structure is preferably formed by a mechanical spring and can in particular be formed by a disc spring. The spring structure is preferably formed by a ring capable of bearing loads in the axial direction, in particular by an annular disc capable of bearing loads in the axial direction. The spring structure can be designed in the shape of a conical shell, in particular as a conical shell-shaped annular disc. Alternatively or additionally, the spring structure can be wave-shaped in the circumferential direction; in particular, the spring structure can be a wave-ring spring.

[0015] Furthermore, the spring structure can be slotted, i.e., the spring structure can have slots extending in the radial direction, wherein the slots extend from radially inside to radially outside and / or from radially outside to radially inside. Alternatively or in addition to the slots, the spring structure can also have other recesses, e.g., circular segment-shaped or angular recesses radially outside or radially inside the spring structure and / or angular or circular holes.

[0016] The pump housing, together with the spring structure, forms a pre-assembled pump unit, i.e., an assembly unit. In such embodiments, the pump comprises a securing device having a female retaining element with an axially extending recess and a male retaining element which can be brought into axial tensile engagement with the female retaining element in the recess, and having an additional retaining element. In alternative embodiments, the securing device can also axially secure only the pump housing. Advantageously, the peripheral wall can be connected to the first end wall and / or the second end wall via a retaining device, in particular via at least one holder. The end wall or the end walls is / are positioned and held together by the retaining device with respect to the rotational angle position relative to the peripheral wall. The retaining device can be formed separately from the securing device.Preferably, the holding device is formed by the securing device, in particular by at least one of the holding elements.

[0017] The holder of the holding device is preferably formed by one of the holding elements, preferably the female holding element. For this purpose, one of the holding elements, preferably the female holding element, preferably protrudes into the first end wall and / or the second end wall with a rod-shaped section or passes through them. Furthermore, one of the holding elements, preferably the female holding element, can protrude into the peripheral wall with a rod-shaped section or pass through it.

[0018] The additional retaining element is a separate and additional retaining element from the male retaining element and the female retaining element. The securing device serves to axially secure the pump housing, in particular to axially secure the spring structure and / or the end wall. Preferably, the securing device serves to releasably axially secure the pump housing, in particular to axially secure the spring structure and / or the end wall to the pump housing. Particularly in embodiments without a spring structure and / or without an additional retaining element, the securing device secures the end wall to the pump housing.

[0019] In particular, the retaining elements serve to hold the individual components of the pump together. The pre-assembled assembly unit preferably comprises at least the peripheral wall, the end wall, optionally the further second end wall, the conveying element arranged in the pump housing, and the spring structure, with the securing device axially securing the assembly unit.

[0020] Preferably, the spring structure and / or the end wall has axial contact with the securing device, in particular with one of the holding elements, on an outer end face axially facing away from the delivery chamber and is / are held on the pump housing as a result. When it is said that the end wall is held on the pump housing, this means that the end wall is held in particular on the peripheral wall and / or the second end wall of the pump housing. In preferred embodiments, the spring structure and / or the end wall is held on the pump housing by one of the holding elements through the joining engagement. In particular, the spring structure preferably has axial contact with the securing device, in particular with one of the holding elements, on a rear side axially facing away from the pump housing and is thereby held on the pump housing.

[0021] The spring structure preferably has axial contact with the first end wall on a front side axially facing the pump housing. The spring structure preferably has axial contact with one of the retaining elements on a rear side axially facing away from the pump housing and is thereby held on the pump housing. In particular, one of the retaining elements presses the spring structure in the axial direction against the pump housing through axial contact with a rear side of the spring structure axially facing away from the pump housing.

[0022] In a pre-assembled state of the pump, the spring structure is preferably held directly or indirectly on the pump housing by the joining engagement of the male retaining element with the female retaining element. In a pre-assembled state of the pump, the additional retaining element is preferably held directly or indirectly on the pump housing by the joining engagement of the male retaining element with the female retaining element. Preferably, the additional retaining element is held directly on the pump housing by the joining engagement of the male retaining element with the female retaining element.

[0023] The spring structure can be overlapped by one of the retaining elements, preferably the additional retaining element, when viewed axially from the spring structure, and can be engaged from behind by the end wall. Preferably, the additional retaining element at least partially overlaps the spring structure when viewed axially from the spring structure and holds the spring structure to the pump housing. In alternative embodiments, the end wall is overlapped by one of the retaining elements, preferably the additional retaining element, when viewed axially from the end wall, and can be engaged from behind by the pumping chamber.

[0024] In embodiments with an additional holding element, the additional holding element is preferably held by the joining engagement of the holding elements and the spring structure and / or the end wall is held on the pump housing by the additional holding element.

[0025] In preferred embodiments, the additional retaining element has at least one tab on an outer circumference, which protrudes radially outward and overlaps the spring structure when viewed axially toward the end wall. Preferably, the additional retaining element has at least two, in particular four, tabs that are evenly distributed along the outer circumference.

[0026] Particularly preferably, the spring structure and the end wall are in contact with the additional retaining element on an end face axially facing away from the delivery chamber and are held to the pump housing by the mating engagement of the female retaining element with the male retaining element. Preferably, the end wall is in axial contact with the additional retaining element radially inward of the axial contact between the additional retaining element and the spring structure.

[0027] To establish the joining engagement, the male retaining element or the female retaining element is brought into contact with the other retaining element consisting of the male retaining element and the female retaining element relative to the pump housing and / or relative to the spring structure. The male retaining element or the female retaining element is preferably additionally brought into contact with the additional retaining element relative to the pump housing and / or relative to the spring structure during the establishment of the joining engagement. The joining engagement is preferably based on positive and / or frictional engagement. A material bond should not be excluded, but the joining engagement preferably does not include a material bond.

[0028] The pump housing can be mounted to a receiving device present at the installation site by means of a mounting structure, or it can be pre-mounted. When the pump is stated to be mountable or mounted "on" a receiving device, this also includes mounting within the receiving device. The mounting structure can be an integral part of the pump. It can be provided in addition to the pump housing or formed by one of the aforementioned components of the pump housing, for example, the first end wall or the second end wall. In alternative embodiments, a mounting structure can be provided as an integral part of the receiving device and thus external to the pump.

[0029] The receiving device can, in particular, be a housing of a unit to be supplied with the pressurized fluid, such as a transmission or a motor. In the assembled state, the first end wall or the second end wall, preferably the first end wall, lies axially opposite a connecting wall of the receiving device. The connecting wall of the receiving device can, in particular, be a floor of a receiving shaft for the pump. A pressure connection can open into the connecting wall of the receiving device, through which the pressurized fluid flowing through the outlet can be discharged.

[0030] If the pump is arranged in or on the receiving device, in particular mounted so that the pump outlet is axially facing the connecting wall of the receiving device, the spring structure is preferably axially tensioned. The spring structure is preferably tensioned between the end face of the end wall facing the connecting wall and the connecting wall when the pump is installed.

[0031] When the pump is installed, the securing device has no axial pressure contact, in particular no sealing contact, with the connecting wall of the receiving device. The exclusion of axial pressure contact, in particular sealing contact, with the connecting wall should not mean that the securing device cannot have contact with the connecting wall of the receiving device. The securing device can have axial contact with the connecting wall of the receiving device, although this does not exert any permanent axial compressive forces on the securing device. Thus, when the pump is installed, the securing device can have axial contact with the connecting wall of the connecting device without being pressed against it, as is the case, for example, with axial seals. Particularly preferably, when the pump is installed, the securing device has no axial contact with the connecting wall of the receiving device.

[0032] The safety device and in particular the additional retaining element do not have a sealing function, especially when the pump is installed. In particular, when the pump is installed, the safety device preferably does not serve to fluidically separate the high-pressure side from the low-pressure side. In particular, when installed, the safety device does not serve to establish a tight fluid connection between the pump outlet and the pressure connection of the receiving device.

[0033] When the pump is installed, the securing device is preferably surrounded radially outward by the spring structure, wherein the securing device can at least partially overlap with the spring structure when viewed axially. The securing device preferably extends radially outward to a lesser extent than the spring structure.

[0034] Preferably, the additional retaining element is surrounded radially outwardly by the spring structure when the pump is installed, wherein the additional retaining element can at least partially overlap with the spring structure when viewed axially. The additional retaining element preferably extends radially outwardly less far than the spring structure. Preferably, the spring structure surrounds the female retaining element and / or the male retaining element in the radial direction, wherein the female retaining element and / or the male retaining element can at least partially overlap with the spring structure when viewed axially.

[0035] When the pump is installed, the spring structure can be in axial contact, in particular in axial pressure contact, with the connecting wall of the receiving device. When the pump is installed, the spring structure is preferably in axial sealing contact with the connecting wall of the receiving device to establish a tight fluid connection between the pump outlet and the pressure connection of the receiving device. In particular, the spring structure can perform a sealing function and fluidically connect the pump outlet to the pressure connection of the receiving device and simultaneously fluidically separate it from the low-pressure side.

[0036] If the spring structure assumes a sealing function and / or if an additional seal, in particular a radial seal, is provided to establish a tight fluid connection between the outlet of the pump and the pressure connection of the receiving device, the securing device, in particular the part of the securing device visible in an axial view of the end wall, is arranged entirely within the high-pressure side. The securing device is thus preferably exclusively flushed with pressurised fluid from the high-pressure side. In particular, in this case the additional holding element is arranged entirely on the high-pressure side. In particular, the additional holding element is thus preferably exclusively flushed with pressurised fluid from the high-pressure side. Preferably, the female holding element and / or the male holding element are / are also arranged within the high-pressure side of the pump.

[0037] Preferably, the additional retaining element is held by the mating engagement of the female retaining element with the male retaining element. The additional retaining element can be held between the female retaining element and the male retaining element, wherein preferably the female retaining element and / or the male retaining element protrudes / protrudes through the additional retaining element.

[0038] Preferably, the additional retaining element has at least one passage through which the female retaining element or the male retaining element, preferably the male retaining element, can axially protrude. The passage can be formed on a radially outer edge of the additional retaining element, in particular in the region of a tab that protrudes radially outward on an outer circumference of the additional retaining element.

[0039] The tab of the additional retaining element preferably overlaps the spring structure when viewed axially towards the end wall. The additional retaining element preferably has a plurality of tabs that project outwards when viewed axially towards the additional retaining element, for example two diametrically opposed tabs or four tabs radially opposed in pairs. If the additional retaining element has a plurality of tabs, these are preferably evenly distributed along the outer circumference. Preferably, a tab has the same angular distance from its directly adjacent tabs or, in the case of two tabs, from its adjacent tab in both circumferential directions, for example 90° for four tabs, 120° for three tabs, or 180° for only two tabs.

[0040] A passage for the female retaining element or the male retaining element can be formed in the area of each tab, or only for individual tabs. Preferably, the additional retaining element has several tabs, with one or no passage for the female retaining element and / or the male retaining element being formed alternately in the area of the tabs.

[0041] The additional retaining element is preferably formed separately from the female retaining element and the male retaining element and is preferably held by the mating engagement of the female retaining element with the male retaining element. In alternative embodiments, the additional retaining element can be formed jointly with the male retaining element or the female retaining element and form a single component with the male retaining element or the female retaining element.

[0042] In this way, the additional retaining element is directly in mating engagement with the male retaining element or the female retaining element.

[0043] The additional retaining element overlaps the end wall in an axial view, in particular in an axial view of the first end wall, and holds the pump housing axially together. Preferably, the additional retaining element overlaps the outlet in an axial view, in particular, the additional retaining element completely covers the outlet in an axial view.

[0044] In preferred embodiments, the end wall, in particular the first end wall, extends further in the radial direction than the additional holding element, such that the end wall protrudes in the radial direction relative to the additional holding element. The additional holding element can have contact with the end wall on its side axially facing the pump housing and can thereby hold the end wall to the pump housing. The additional holding element can preferably be at least partially in axial contact with the end wall, in particular rest on the end wall. In alternative embodiments, the additional holding element has no direct contact with the first end wall. The additional holding element can axially secure the first end wall in the axial direction relative to the peripheral wall and / or the second end wall, in particular through the axial contact with the end wall.

[0045] When the pump is installed, the additional retaining element can be in contact, in particular axial contact, exclusively with the female retaining element and / or the male retaining element, the spring structure, and preferably the first end wall. Preferably, the additional retaining element, with its rear side facing away from the end wall, is in contact, in particular axial contact, exclusively with the male retaining element or the female retaining element. Preferably, the additional retaining element, with its rear side facing away from the end wall, is in contact, in particular axial contact, exclusively with the male retaining element.

[0046] The additional holding element is preferably formed by a plate or a flat shell. The additional holding element can be flat or shell-shaped, in particular concave or convex with respect to the pump housing. In preferred embodiments, the additional holding element is a flat plate. The additional holding element, in particular its circumference, is preferably circular. The additional holding element can be single-layered or multi-layered. The additional holding element is preferably formed by a single layer.

[0047] The additional retaining element can be formed by a continuous plate or shell or a perforated plate or shell. Preferably, the additional retaining element is formed by a perforated plate with at least one passage for the fluid. The additional retaining element can have one or more passages for the fluid. The passages preferably have a circular cross-section, but in alternative embodiments, they can also have a rectangular cross-section. The additional retaining element preferably functions as a throttle and / or cold-start plate.

[0048] Advantageously, the axial extent of the recess of the female retaining element is greater than the furthest radial extent of the recess. Preferably, the recess extends more than twice as far in the axial direction as in the radial direction. In advantageous embodiments, the recess of the female retaining element extends further in the axial direction than the average thickness of the spring structure, wherein the average thickness of the spring structure is understood to be the arithmetic mean of the possibly varying axial extent of the spring structure over its entire surface.

[0049] If the female retaining element is part of the pump housing, for example as a recess in the end wall or if the female element is formed by a holder projecting through the end wall, the recess preferably extends as far as an opening axially facing the spring structure and is closed apart from the opening. Preferably, the recess of the female retaining element has an opening at a first axial end and a base at a second axial end. A section through the recess of the female retaining element or a portion of the recess transverse to its axial extent is preferably substantially circular, but may also be, for example, elliptical or rectangular.The expression "essentially circular" in the sense of the present application is to be understood as meaning, in particular, not only circular cross-sections but also cross-sections which have a circular core, such as those found in a spline or a thread.

[0050] Preferably, the recess of the female retaining element has a substantially constant cross-section along its axial extent. The term "substantially constant" is intended to take into account, in particular, cross-sections of a thread that may differ from one another along their axial length depending on the cutting plane. In alternative embodiments, the cross-section of the recess may change along its axial extent, for example, in shape and / or size. Particularly preferably, the recess of the female retaining element is formed by a blind hole, in particular a circular blind hole.

[0051] The male retaining element extends through one of the pump housing and the additional retaining element and / or protrudes from one of the pump housing and the additional retaining element. In preferred embodiments, the male retaining element extends through the additional retaining element in the axial direction. Particularly preferably, the male retaining element extends through the additional retaining element in the axial direction toward the first end wall. The male retaining element preferably has its greatest extent in the axial direction. This means that the male retaining element extends further in the axial direction than in the radial direction.

[0052] A section through the male retaining element or a portion of the male retaining element transverse to the axial direction of the male retaining element preferably has a substantially circular cross-sectional area, but may also be elliptical, annular, or rectangular, for example. Particularly preferably, the male retaining element has a cross-section complementary to the cross-section of the recess of the female retaining element.

[0053] Preferably, the male retaining element has a variable cross-section along its axial extent. In particular, the cross-section can change in shape and / or size, particularly in a stepped manner, between a first part of the male retaining element and a second part of the male retaining element. Alternatively, the male retaining element can have a constant cross-section along its axial extent. In preferred embodiments, the male retaining element has a shaft and a head.

[0054] The male retaining element can be brought into axially tensile engagement with the female retaining element via the recess in the female retaining element. In other words, the male retaining element protrudes at least partially, in particular with its shaft, into the recess of the female retaining element and forms an axially tensile engagement with the female retaining element. The engagement can be positively and / or non-positively engaged. The engagement is advantageously designed to be releasable. In particularly preferred embodiments, the engagement of the female retaining element with the male retaining element can be released non-destructively.

[0055] The male retaining element or the female retaining element can be in axial contact with the rear side of the additional retaining element facing axially away from the pump housing and press the additional retaining element against the spring structure. Preferably, a portion of the male retaining element and / or the female retaining element extends through a passage in the additional retaining element and forms axial contact with another portion with the rear side of the additional retaining element facing away from the pump housing. Particularly preferably, the male retaining element extends through the additional retaining element with its shaft and presses axially against the additional retaining element with its head.

[0056] Preferably, the male retaining element closes the recess of the female retaining element or its opening during mating engagement. Closing the recess of the female retaining element by the male retaining element ensures that the abrasion generated by the relative movement between the female retaining element and the male retaining element during assembly is pressed into the recess and enclosed therein.

[0057] The male retaining element closes the recess of the female retaining element during mating engagement, preferably by at least partially protruding into the recess. The male retaining element or a part of the male retaining element can completely or partially traverse the recess of the female retaining element in the axial direction. This means that the male retaining element or a part of the male retaining element protrudes from the opening of the recess of the female retaining element to the end of the recess opposite the opening, or protrudes from the opening of the recess toward the end opposite the opening without reaching the end.

[0058] In preferred embodiments, the male retaining element has a shaft and a head, wherein the shaft extends axially through a passage of the additional retaining element and into the recess of the female retaining element. The head of the male retaining element is in axial contact with the rear side of the additional retaining element facing axially away from the pump housing and presses the additional retaining element against the spring structure and / or the end wall, so that the spring structure and / or the end wall is held to the pump housing.

[0059] The male retaining element can form the joining engagement with the female retaining element, for example, by means of a press connection or pressure connection. In the case of a press connection or pressure connection, the male retaining element has an oversize relative to the recess of the female retaining element, i.e., the male retaining element is pressed or pushed into the recess of the female retaining element.

[0060] The female retaining element can be pushed or pressed onto the male retaining element, or the male retaining element can be pushed or pressed into the female retaining element. To establish the joining engagement, the female retaining element or the male retaining element is moved toward the other retaining element.

[0061] Preferably, the male retaining element and the female retaining element form a screw engagement. For this purpose, the male retaining element, in particular the shaft of the male retaining element, has an external thread, and the recess of the female retaining element has a corresponding internal thread. In the case of a screw connection, the male retaining element and the female retaining element preferably have a metric thread. In particular, the thread is a metric thread smaller than M5.

[0062] In preferred embodiments, one of the retaining elements, preferably the female retaining element, is formed or inserted in or on an end wall, preferably the first end wall, or preferably projects into or through the end wall with axial sliding contact.

[0063] For example, the female retaining element or its recess can be introduced in the form of a bore, in particular a blind hole, in the holder or in the end wall, in particular the first end wall. In a preferred embodiment, the female retaining element projects with axial sliding contact into the end wall, in particular into a passage of the end wall, and terminates therewith, preferably flush, on the rear side facing away from the pump housing.

[0064] The male retaining element can be, for example, a screw, a blind rivet, a threaded pin, or a press-in bolt or press-in pin. The male retaining element is preferably a standard part. The male retaining element can, for example, be formed by a threaded pin with an external thread, preferably in accordance with DIN EN ISO 4026, DIN EN ISO 4027, DIN EN ISO 4028, or DIN EN ISO 4029 in the version valid on the date of application.

[0065] The female retaining element can be formed, for example, by a bore, in particular a blind hole, a nut, in particular a cap nut, or a pin with an internal thread. The female retaining element is preferably a standard part. The male retaining element and the female retaining element are preferably formed by standard parts. The female retaining element can be formed, for example, by a nut, in particular a cap nut, or by a standard pin with an internal thread, preferably according to DIN EN ISO 8735 or DIN EN ISO 8733.

[0066] Preferably, the female retaining element is a component of the pump housing and positions the peripheral wall and the end wall, in particular as a holder, relative to each other in terms of angular position. The recess of the female retaining element is provided on an end face of the female retaining element facing the spring structure.

[0067] In particularly preferred embodiments, one of the holding elements consisting of the male holding element and the female holding element, preferably the female holding element, projects from the peripheral wall in front of or through the peripheral wall axially into or through the first end wall. Preferably, one of the holding elements consisting of the male holding element and the female holding element, preferably the female holding element, projects from the second end wall and projects through the peripheral wall and the first end wall. The holding element can be formed together with the second end wall or can be firmly connected to the second end wall as a separate component. The female holding element is preferably formed by a standard pin with an internal thread, preferably according to DIN EN ISO 8735 or DIN EN ISO 8733.

[0068] The pump can be, for example, a linear displacement pump or, more preferably, a rotary pump. As a rotary pump, it can be externally axial, for example, an external gear pump, or internally axial, for example, a vane pump, internal gear pump, or pendulum-slider pump. The conveying element can comprise a rotor that is rotatable about a rotational axis in the conveying chamber and serves to convey the fluid from one or more inlets to one or more outlets. The rotor can advantageously serve to form conveying cells that periodically expand and contract as the rotor rotates in order to convey the fluid from the low-pressure side of the pump to the high-pressure side of the pump.

[0069] If the pump is installed in a vehicle, as is preferred, it can be driven by the vehicle's drive motor, for example, an internal combustion engine or an electric motor. In hybrid vehicles, the pump can be driven either by the internal combustion engine or by the electric motor. In an advantageous modification, the pump drive can also be designed so that the pump can be driven either by the internal combustion engine or the electric motor, or by both of these motors together. Thus, the internal combustion engine and the electric motor can drive the pump, in particular via a gear train.

[0070] The invention is explained below using exemplary embodiments. Features disclosed in the exemplary embodiments advantageously develop the subject matter of the claims, the aspects, and also the embodiments explained above. They show: Figure 1: an isometric view of a pump of a first embodiment, Figure 2: an isometric view of a pump of a second embodiment, Figure 3: the pump of the first embodiment in a longitudinal section, Figure 4: a detailed view of the joining engagement of the first embodiment, Figure 5: a longitudinal section of the pump of the first embodiment in the installed state, Figure 6: a schematic view of a joining engagement of a third embodiment, Figure 7: a schematic view of a joining engagement of a fourth embodiment, Figure 8: a schematic view of a joining engagement of a fifth embodiment.

[0071] Figure 1 discloses a pump of a first embodiment in isometric view. Figure 3discloses a longitudinal section of the pump according to the first embodiment. The pump has a pump housing 10 with a peripheral wall 12, a first end wall 11, and a second end wall 13. A mounting structure is formed on the second end wall 13, with which the pump can be fixed to a receiving device, for example by means of screws. The first end wall 11 is formed on the side of the peripheral wall 12 facing away from the mounting structure. The peripheral wall 12, the first end wall 11, and the second end wall 13 are formed as separate components. In alternative embodiments, for example, the peripheral wall 12 can be formed integrally with the second end wall 13 or the first end wall 11.

[0072] The peripheral wall 12 radially surrounds a delivery chamber in which a delivery element 17, 18 is arranged to deliver the fluid from a low-pressure side of the pump to a high-pressure side of the pump. The delivery chamber is bounded axially by the first end wall 11 and the second end wall 13.

[0073] The conveyor member is preferably formed by a rotatable conveyor rotor 18, which is non-rotatably connected to a drive shaft 17 and is driven by the latter. Figure 3 is a longitudinal section through the pump. The drive shaft 17 extends axially through the second end wall 13. The rotor 18 is immobilely connected to the drive shaft 17, so that rotation of the drive shaft 17 about the rotational axis R results in rotation of the rotor 18 about the rotational axis R.

[0074] The conveyor rotor 18 is preferably formed by a rotor of a vane pump with at least one vane. It should be noted that the invention is not limited to vane pumps. The invention can also be used, for example, in pendulum-slide pumps, external gear pumps, or internal gear pumps.

[0075] The peripheral wall 12 forms a closed ring, while the end walls 11 and 13 are each plate-shaped. An outlet for the fluid opens onto the end wall 11 on the outer face axially facing away from the pumping chamber. The pump according to the first embodiment is single-flow, i.e., it has a working flow with one inlet and one outlet. It should be noted at this point that the invention is not limited to single-flow pumps and can also be applied, for example, to multi-flow or multi-circuit pumps, in particular double-flow pumps, with multiple outlets and / or inlets.

[0076] The pump housing 10 is secured in the axial direction by a securing device 20. The securing device 20 according to the first embodiment comprises a female retaining element 21 with an axially extending recess 22 and a male retaining element 23, which is in axially tensile engagement with the female retaining element 21 in the recess 22, as well as an additional retaining element 24.

[0077] The spring structure 14 is arranged axially between the first end wall 11 and the additional holding element 24. The additional holding element 24 overlaps the spring structure 14 in an axial view of the first end wall 11 in a radially inner region of the spring structure 14; preferably, the additional holding element 24 overlaps the spring structure with the tabs 25. In an axial view from the first end wall 11 in the direction of the spring structure 14, the additional holding element 24 engages behind the spring structure 14; preferably, the additional holding element 24 engages behind the spring structure with the tabs 25. In this way, the spring structure 14 is held on the pump housing 10 by means of the additional holding element 24. The spring structure 14, formed as a mechanical spring, in the exemplary embodiment as a disc spring, serves to axially press the housing walls 11, 12 and 13 of the pump housing 1 together when the pump is assembled, thereby sealing the delivery chamber.

[0078] The securing device 20 serves in particular to axially secure the spring structure 14 to the pump housing 10 and to axially secure the pump housing 10. In particular, the female holding element 21, the male holding element 23 and the additional holding element 24 serve to secure the spring structure 14 to the pump housing 10 and to axially secure the pump housing 10. In alternative embodiments, in particular in embodiments without a spring structure, the securing device can axially secure the end wall 11 to the pump housing instead of the spring structure 14.

[0079] The additional holding element 24 is a separate holding element from the male holding element 23 and the female holding element 21. In alternative embodiments, the additional holding element can also be formed integrally with the female holding element 21 or the male holding element, in particular by the female holding element 21 or the male holding element 23, as shown in the Figures 6 and 7 is revealed.

[0080] As is particularly evident from Figure 3 As can be seen, the additional holding element 24 is held on the pump housing 10 by the mating engagement of the male holding element 23 with the female holding element 21. The additional holding element 24 is formed on the side of the first end wall 11 of the pump housing 10. In particular, the additional holding element 24 is formed on the side of the pump housing 10 axially remote from the second end wall 13.

[0081] The additional retaining element 24 has at least one tab 25 on its outer circumference, which protrudes radially outward. In particular, the additional retaining element 24 has four tabs 25 that protrude radially outward from the additional retaining element 24. According to the first embodiment, the tabs 25 are evenly distributed over the outer circumference of the additional retaining element 24.

[0082] The tabs 25 overlap the spring structure 14 when viewed axially toward the end wall 11. The spring structure 14 is in axial contact with the additional retaining element 24, in particular with the tabs 25 of the additional retaining element 24, on a rear side axially facing away from the pump housing 10, and is thereby held on the pump housing 10. The additional retaining element 24 presses the spring structure 14 in the axial direction against the pump housing 10, in particular against the first end wall 11. The additional retaining element 24 also presses the end wall 11 against the pump housing 10, in particular against the peripheral wall 12.

[0083] The additional holding element 24 has at least one passage through which the female holding element 21 or the male holding element 23 protrudes axially. According to the first exemplary embodiment, the male holding element 23 protrudes through the passage of the additional holding element 24 in the axial direction. According to the first exemplary embodiment, the additional holding element 24 has a total of two passages, each for a male holding element 23. The passages are formed in the region of a tab 25 on the outer edge of the additional holding element 24. According to the first exemplary embodiment, a male holding element 23 protrudes through the additional holding element 24 in the axial direction towards the first end wall 11.

[0084] The additional holding element 24 is in axial contact with a part of the male holding element 23 on a rear side axially facing away from the pump housing 10 and is pressed in the axial direction against the spring structure 14. The additional holding element 24 in turn presses the spring structure 14 in the axial direction against the pump housing 10, in particular against the first end wall 11, whereby the end wall 11 is held on the pump housing 10. As can be seen in particular from Figure 3 As can be seen, the additional holding element 24 has axial contact with the spring structure 14 and the first end wall 11 on its front side axially facing the pump. In this way, the additional holding element 24 presses the spring structure 14 in the axial direction against the first end wall 11 and the first end wall 11 in the axial direction towards the second end wall 13. In this way, the pump housing 10 is held together in the axial direction.

[0085] The male retaining element 23 protrudes at least partially into the recess 22 of the female retaining element 21 and forms a joining engagement with the female retaining element 21 that can withstand axial tensile loads. The joining engagement of the male retaining element 23 with the female retaining element 21 is designed to be releasable and, according to the first embodiment, is formed in the form of a screw connection.

[0086] The male retaining element 23 closes the recess 22 of the female retaining element 21. By closing the recess 22 of the female retaining element 21 by the male retaining element 23, the abrasion resulting from the relative movement between the female retaining element 21 and the male retaining element 23 during assembly is pressed into the recess 22 and enclosed therein.

[0087] The additional retaining element 24 is designed in the form of a perforated plate that overlaps, in particular completely overlaps, the outlet of the pump housing 10 in the axial direction. In this way, the additional retaining element 24 also performs a throttling function.

[0088] The female retaining element 21 is formed on the front side of the additional retaining element 24 facing the pump housing 10. The female retaining element 21 is designed in the form of a holder and is a component of the pump housing 10. It positions the peripheral wall 12 and the end wall 11 relative to each other in terms of angular position. The recess of the female retaining element 21 is provided on the end side of the female retaining element 21 facing the spring structure 14.

[0089] According to the first embodiment, the female retaining element 21 protrudes from the peripheral wall 12 and through the first end wall 11. In particular, the female retaining element 21 protrudes from the second end wall 13 in the axial direction through the peripheral wall 12 and through the first end wall 11. In this way, the female retaining element 21 positions the first end wall 11 and the second end wall 13 with respect to the rotational angular position relative to the peripheral wall 12 and holds them together.

[0090] According to the first embodiment, the female retaining element 21 is designed in the form of a standard part, in particular a standard pin with an internal thread. The male retaining element 23 is correspondingly designed as a standardized screw, which engages the internal thread of the female retaining element 21.

[0091] Figure 4shows the screw engagement of the male retaining element 23 with the female retaining element 21 in detail. The shaft of the male retaining element 23 extends axially through a passage of the additional retaining element 24 and projects into the recess 22 of the female retaining element 21. The passage of the additional retaining element 24 is provided on a radially outer edge of the additional retaining element 24 and can be formed in particular in the region of the tabs 25.

[0092] The head of the male retaining element 23 presses axially against the additional retaining element 24, so that the additional retaining element 24 has axial contact with the male retaining element 23 on a rear side axially facing away from the pump housing 10. The male retaining element 23 clamps the additional retaining element 24 axially against the pump housing 10. In alternative embodiments, the additional retaining element 24 can be omitted, so that the head of the male retaining element 23 presses axially against the end wall 11, so that the end wall 11 is held on the pump housing.

[0093] The joining engagement is formed radially inside the spring structure 14 in an axial view of the spring structure 14. In particular, the joining engagement is formed in an axial view of the spring structure 14 within the sealing contact with, on the one hand, the first end wall 11 and, on the other hand, the axially opposite end wall 11 in the assembled state of the pump, Figures 1 , 3 and 4not shown, connecting wall of the receiving device. The joining engagement is provided in the region of the radially outwardly projecting tabs 25.

[0094] Figure 5 shows the pump of the first embodiment in the installed state. The pump is arranged on or in a receiving device, with the first end wall 11 axially opposite a connecting wall of the receiving device. A pressure connection (not shown in detail) opens into the connecting wall of the receiving device, through which the fluid flowing through the outlet can be discharged. The pump outlet faces axially toward the connecting wall of the receiving device. The receiving device is sealed by a radial seal 16 arranged on the pump housing 10.

[0095] The spring structure 14 is tensioned between the end face of the first end wall 11 facing the connecting wall and the connecting wall. In this way, the spring structure 14 has axial contact with the first end wall 11 and the connecting wall of the receiving device. In particular, the spring structure 14 has axial sealing contact with the first end wall 11 and the connecting wall, so that it additionally functions as an axial seal separating the high-pressure side from the low-pressure side. In addition to the spring structure 14, the pump has at least one further radial seal 15 for separating the high-pressure side from the low-pressure side, in particular in the region of the peripheral wall of the first end wall 11.

[0096] In contrast, the securing device 20 has no axial contact with the connecting wall of the receiving device. According to the invention, the securing device 20 has no axial sealing contact, in particular no pressure contact, with the connecting wall of the receiving device. In particular, neither the male retaining element 23 nor the additional retaining element 24 nor the female retaining element 21 have axial contact with the connecting wall of the receiving device.

[0097] As from Figure 5As can be seen, the securing device 20 is formed exclusively on the high-pressure side of the pump. This means that the securing device 20, in particular the additional retaining element 24 and the male retaining element 23, are only surrounded by fluid that is discharged from the pump through the outlet. The spring structure 14 surrounds the securing device 20 radially on the outside, with the additional retaining element 24 at least partially overlapping axially with the spring structure 14.

[0098] Figure 2 shows an isometric view of a pump according to a second embodiment. Unless otherwise stated, the statements regarding the first embodiment, unless they contradict the embodiment according to Figure 2 their validity.

[0099] The pump from Figure 2differs from the pump of the first embodiment in that the additional holding element 34 does not have any tabs on the outer circumference which project radially outwards and that the additional holding element 34 does not overlap with the spring structure 14 in an axial view of the spring structure 14.

[0100] According to the second embodiment, the spring structure 14 is held on the pump housing 10 by the male retaining element 23. The male retaining element 23 has axial contact with the additional retaining element 34 on the rear side of the additional retaining element 34, which is axially remote from the pump housing. In particular, the male retaining element 23 presses the additional retaining element 34 in the axial direction against the pump housing 10.

[0101] In contrast to the additional retaining element 24 according to the first exemplary embodiment, the additional retaining element 4 essentially only has a throttling function and does not secure the spring structure 14 in the axial direction. However, the additional retaining element 34 can additionally press the first end wall in the axial direction toward the second end wall and thus contribute to securing the pump housing 10 in the axial direction.

[0102] Furthermore, the male retaining element 23 has axial contact with the spring structure 14 on the rear side of the spring structure 14 axially facing away from the pump housing. The male retaining element 23 presses the spring structure 14 in the axial direction against the pump housing 10. In alternative embodiments, the additional retaining element 34 according to the second embodiment can also be omitted. In this case, the pump housing 10 is secured in the axial direction by the male retaining element 23, the female retaining element 21 and the spring structure 14. In particular, in alternative embodiments, the additional retaining element 24 can be omitted, so that the head of the male retaining element 23 presses axially against the end wall 11 and / or the spring structure 14, so that the end wall 11 and / or the spring structure 14 are held on the pump housing.

[0103] The Figures 6-8schematically show further exemplary embodiments of the joining engagement of a female retaining element with a male retaining element. Features of the first exemplary embodiment, which particularly relate to the spring structure 14 and the pump, also apply to the following exemplary embodiments unless expressly stated otherwise. Unless differences are explained or become apparent from the figures, the statements made above regarding the first and / or second exemplary embodiments also apply equally to the other exemplary embodiments.

[0104] Figure 6shows a third embodiment in which the male retaining element 43 is formed by the additional retaining element 44 and does not extend through it. The additional retaining element 44, in particular the tabs 25, has a convex curvature or bulge that protrudes from the additional retaining element 44 toward the first end wall 11 or toward the female retaining element 41. Instead of a curvature or bulge, the male retaining element of the additional retaining element 44 can also be formed as a projecting pin, cam, or the like.

[0105] The female retaining element 41, however, has a concave recess 42 in relation to the first end wall 11, into which the male retaining element 43 can protrude to produce a joining engagement. The recess can be formed on the first end wall 11 directly or on a separate component, for example on a Figure 3 and Figure 5shown holder.

[0106] The recess 42 of the female retaining element 41 is designed to complement the bulge of the male retaining element 43. The mating engagement of the male retaining element 43 with the female retaining element 41 is designed as a plug-in connection. The male retaining element 43 has an oversize relative to the recess of the female retaining element 41, so that the male retaining element 43 can be pressed into the female retaining element 41 and is held in the mating engagement. The holding force with which the male retaining element 43 is held in the mating engagement with the female retaining element 41 is determined by the oversize of the male retaining element 43.

[0107] Figure 7shows a joining engagement in a fourth exemplary embodiment in which the female holding element 51 is formed by the additional holding element 54. The additional holding element 54, for example the respective tab 25, in the formation of the female holding element 51 has a bulge with a recess 52 which extends in the direction away from the first end wall 11. The female holding element 51, i.e. the bulge, is open towards the end wall 11. The male holding element 35 projects from the first end wall 11 and, during joining engagement, into the female holding element 51. This joining engagement is also a plug-in connection. The male holding element 53 can be formed by the end wall 11 itself or by a separate component, for example by a holder for the pump housing 10. The male holding element 53 can thus be an axial protrusion of the end wall 11, i.e. can be formed directly on the end wall 11.

[0108] To form the joining engagement between the male retaining element 53 and the female retaining element 51, the female retaining element 51 is placed onto the male retaining element 53. The male retaining element 53 has an oversize relative to the recess 52 of the female retaining element 51, so that the male retaining element 53 can be pressed into the female retaining element 51 and is held in the joining engagement. The holding force with which the male retaining element 53 is held in the joining engagement with the female retaining element 51 is determined by the oversize of the male retaining element 53.

[0109] A plug-in engagement is also understood to mean a snap-in or locking engagement of the retaining elements, similar to a push-button connection. It is generally advantageous if the respective plug-in engagement is designed such that the recess 42 or 52 is closed by the male retaining element 43 or 53 to such an extent that any dirt particles that may have entered the recess 42 or 52 are enclosed and are not discharged during pump operation.

[0110] Figure 8shows a fifth embodiment of a joining engagement, in which the male retaining element 63 protrudes through a passage of the additional retaining element 24 in the direction away from the first end wall 11. The male retaining element 63 protrudes from the first end wall 11 and forms a joining engagement with the female retaining element 61. The male retaining element 63 can be formed by the end wall 11 itself or by a separate component. Thus, the male retaining element 63 can be an axial projection of the end wall 11, i.e., directly on the end wall 11.

[0111] The male retaining element 63 has an external thread, in particular a metric external thread, at its end axially remote from the second end wall 13. The male retaining element 63 can have a thread only in one axial end section, in both axial end sections, or be designed as a threaded pin having a thread over its entire axial length. In designs as a threaded pin with a continuous thread over the axial length or with threads at the axial ends, the male retaining element 63 is preferably in screw engagement with both the female joining element 62 and the second end wall 13.

[0112] The female retaining element 61 is formed in the form of a nut, in particular in the form of a cap nut. The female retaining element 61 presses axially against the additional retaining element 24 when mating with the male retaining element 63, so that the additional retaining element 24 has axial contact with the female retaining element 62 on a rear side axially facing away from the pump housing 10, and thus holds the additional retaining element 24 to the pump housing 10.

[0113] In modifications of the fifth embodiment, the male retaining element and the female retaining element provided separately from the additional retaining element 24 may also be plug-in elements for producing a plug-in engagement instead of a screw engagement.

[0114] In further modifications, retaining elements in the form of screw elements, such as threaded pins and / or nuts, can be firmly joined to the additional retaining element 24 and preferably arranged on the tabs 25. In such embodiments, the respective screw counter-element is axially fixed to the pump housing 10, but is rotatably connected to the pump housing 10 in order to be able to establish the joining engagement as a screw engagement. List of reference symbols

[0115] 10Pump housing 11End wall 12Peripheral wall 13Second end wall 14Spring structure 15Radial seal 16Radial seal 17Drive shaft 18Rotor 20Securing device 21Female retaining element 22Recess 23Male retaining element 24Additional retaining element 25Tab 34Additional retaining element 41Female retaining element 42Recess 43Male retaining element 44Additional retaining element 51Female retaining element 52Recess 53Male retaining element 54Additional retaining element 61Female retaining element 62Recess 63Male retaining element 64Additional retaining element

Claims

1. A pump for supplying fluid to a unit, the pump comprising: 1.

1. a pump housing (10) comprising - an inlet for the fluid on a low-pressure side, - an outlet for the fluid on a high-pressure side, - a circumferential wall (12) which radially surrounds a delivery chamber, and - an end wall (11) having an outer end face which faces axially away from the delivery chamber and on which the outlet emerges; 1.

2. a spring structure (14) which is arranged on the outer end face of the end wall (11); 1.

3. a delivery member (17, 18) which can be moved within the delivery chamber for delivering the fluid from the low-pressure side to the high-pressure side; 1.

4. a securing device (20) for axial securing the pump housing (10), in particular for transport, the securing device (20) comprising - a female holding element (21; 41; 51; 61) having an axially extending cavity (22; 42; 52; 62), - a male holding element (23; 43; 53; 63) which is in a joining engagement, which can be exposed to an axial tensile load, with the female holding element (21; 41; 51; 61) in the cavity (22; 42; 52; 62), and - an additional holding element (24; 34; 44; 54; 64), 1.

5. wherein the spring structure (14) and / or the end wall (11) is / are held on the pump housing (10) by one of the holding elements by way of the joining engagement, characterised in that 1.

6. the securing device (20) is not in an axial sealing contact with a connecting wall of an accommodating device when the pump is installed, and 1.

7. the additional holding element (24; 34; 44; 54; 64) overlaps with the end wall (11) in an axial view and holds the pump housing (10) axially together.

2. The pump according to the preceding claim, wherein an outer end face of the spring structure (14) and / or end wall (11) which faces axially away from the delivery chamber is in axial contact with one of the holding elements, whereby the spring structure (14) and / or end wall (11) is / are held on the pump housing (10).

3. The pump according to any one of the preceding claims, wherein the additional holding element (24; 34; 44; 54; 64) is formed separately from the female holding element (21; 41; 51; 61) and the male holding element (23; 43; 53; 63) and is held by way of the joining engagement between the holding elements, and wherein the female holding element (21; 41; 51; 61) and / or the male holding element (23; 43; 53; 63) preferably protrude(s) through the additional holding element (24; 34; 44; 54; 64).

4. The pump according to any one of the preceding claims, wherein the additional support element (24; 34; 44; 54; 64) is formed by a plate or a flat cup which is concave or convex in relation to the pump housing (10), and wherein the additional support element (24; 34; 44; 54; 64) is preferably perforated and / or comprises one layer and / or is circular.

5. The pump according to any one of the preceding claims, wherein the additional holding element (24; 34; 44; 54; 64) additionally encompasses the function of a throttle and / or cold start plate.

6. The pump according to any one of the preceding claims, wherein the additional holding element (24; 44; 54; 64) overlaps with the spring structure (14) in an axial view onto the spring structure (14) and holds the spring structure (14) on the pump housing (10).

7. The pump according to any one of the preceding claims, wherein the additional holding element (24) comprises at least one radially protruding tongue (25) which overlaps with the spring structure (14) in an axial view onto the spring structure (14) and holds the spring structure (14) on the pump housing (10).

8. The pump according to any one of the preceding claims, wherein the female holding element (21; 41; 51; 61) or the male holding element (23; 43; 53; 63) is in axial contact with a rear side of the additional holding element (24; 34; 44; 54; 64) which faces axially away from the pump housing (10) and presses the additional holding element (24; 34; 44; 54; 64) against the spring structure (14) and / or against the end wall (11).

9. The pump according to any one of the preceding claims, wherein when the pump is installed, the additional holding element (24; 34; 44; 54; 64) is exclusively in contact with the female holding element (21; 41; 51; 61) and / or the male holding element (23; 43; 53; 63) and / or the spring structure (14) and / or the end wall (11).

10. The pump according to any one of the preceding claims, wherein the spring structure (14) is in a sealing contact with the end wall (11) and / or the connecting wall of the accommodating device when the pump is installed.

11. The pump according to any one of the preceding claims, wherein the female holding element (21; 41; 51; 61) or the male holding element (23; 43; 53; 63) protrudes axially from or through the circumferential wall (12) into or through the end wall (11).

12. The pump according to any one of the preceding claims, wherein the female holding element (21; 41; 51; 61) and / or the male holding element (23; 43; 53; 63) is / are arranged on the high-pressure side of the pump.

13. The pump according to any one of the preceding claims, wherein the spring structure (14) surrounds the female holding element (21; 41; 51; 61) and / or the male holding element (23; 43; 53; 63) in the radial direction.

14. The pump according to any one of the preceding claims, wherein the female holding element (21; 61) and the male holding element (23; 63) are in joining engagement via a screwing connection.

15. The pump according to any one of the preceding claims, wherein the female holding element (21; 61) and the male holding element (23; 63) are formed by standard parts comprising metric threads, and the female holding element (21; 61) is preferably a standard pin comprising an internal thread and the male holding element (23; 63) is a matching machine screw.