Drive assembly

Abstract

Drive assembly, manufactured by a method for fixing a stator component (1) in a housing component (2), in particular a metallic one, wherein the housing component has a housing outer surface (21), a housing inner surface (22) and a housing opening (23) at the front characterized by the fact that starting from a first process step in which the stator component (1) is arranged on an inner side of the housing component, In a second process step, a circumferential recess (31, 32), in particular a bead, is introduced into the housing component on the outside of the housing, forming a circumferential fixing projection (33, 34), wherein the fixing projection permanently fixes the stator component (1) to the housing component.

Description

[0001] The invention generally relates to a drive assembly with a stator component fixed in a housing component, a method for fixing it, and a fluid pump. In particular, the invention relates to a drive assembly manufactured by a method for fixing it by creating at least one recess, in particular a groove, bead, or the like, in the housing component, especially by rolling.

[0002] Fluid pumps, such as those used in automotive applications for example as coolant or oil pumps, typically have a pump rotor for conveying fluid, which is driven by an electric drive unit. Often, the pump rotor and the rotor of the drive unit are arranged axially one behind the other in a pump housing and connected by a shaft. The corresponding stator of the drive unit is permanently fixed in position within the pump housing, and various fastening methods are possible. For example, EP4230869A1 describes how the stator or a stator component can be positively connected to a corresponding housing component of the pump housing by bonding or by press fit.

[0003] However, such arrangements and connections between the stator component and the housing component are complex, prone to errors, and, in the case of press fits, involve considerable stress on the respective components. To create a press fit, the housing component must first be heated until it reaches a certain thermal expansion, so that the stator component can be positioned correctly. During this positioning process, damage to mating surfaces and the like is possible. Furthermore, not only the housing component but also the stator component is subjected to significant temperature stress.

[0004] The object of the present invention is therefore to achieve a positionally accurate and permanent arrangement of the housing component and the stator component, in which at least one of the disadvantages described above is at least partially improved.

[0005] To solve this problem, the invention proposes a drive component manufactured using a method described below for fixing a stator component in a housing component, particularly a fluid pump. The housing component has an outer surface, an inner surface, and an end-face opening. The opening connects an inner chamber, surrounded by the inner surface, to the outer surface. Where reference is made to an axial direction in connection with the invention, the opening points in the axial direction. The housing component is preferably made of metal. It is particularly preferred that the housing component is manufactured, especially in one piece, from aluminum and / or steel. In particular, the housing component is a casting. However, the housing component can also be sintered.

[0006] According to the invention, starting from a first process step in which the stator component is arranged on the inside of the housing, a recess, in particular a groove, is formed on the outside of the housing component in a second process step, forming a circumferential fixing projection, particularly on the inside of the housing, wherein the fixing projection permanently fixes the stator component to the housing component. The recess is generally preferably formed in the form of an annular groove, wherein the annular groove particularly preferably has a constant cross-section after completion of the second process step. The recess is preferably formed continuously around the entire circumference of the stator component.

[0007] In the second process step, the depression is preferably created section by section, in particular by extending the depression section in one direction along the circumference, especially continuously, starting from a depression section created at the beginning of the process, to form the circumferential depression. Specifically, the circumferential depression is further deepened (axially and / or radially) by continuing the extension in one direction along the circumference until a target depth is reached, particularly uniformly over the entire circumference. Specifically, the depression section created at the beginning of the second process step has a shallower depth than at the end of the second process step.This method of creating the recess is particularly gentle and can also minimize unwanted misalignment between the stator and housing components during the process. Generally, the recess is advantageously created by rolling, especially by roll forming.

[0008] Preferably, the method also includes the first process step, with the second process step following the first. Preferably, during the first process step, the housing component has a surface temperature that differs from the temperature of the environment surrounding the housing component during the first process step by a maximum of 20 K. In particular, during the second process step, and especially during the first process step, the housing component and the stator component have surface temperatures that differ by a maximum of 20 K.In particular, the first process step includes coaxially aligning the stator component with respect to its outer contour and the housing component with respect to its inner contour, whereupon the stator component is moved axially through the housing opening into the housing interior of the housing component, so that the stator component is arranged in its intended position, in particular in a clearance fit to the housing component.

[0009] In particular, during the formation of the fixing projection, material from the housing component is pressed against the stator component, preferably with the housing component material engaging a corresponding section of the stator component. This creates a positive-locking and / or force-locking connection. The corresponding section is designed such that, when engaged, removal of the stator component from the housing component is prevented. Specifically, the fixing projection is designed such that separating the housing component and the stator component destroys the fixing projection.

[0010] In the drive assembly and method according to the invention, excessive stress on the stator and housing components is avoided, thus extending their service life. Preparations on the housing and / or stator components can be completely eliminated. Furthermore, additional fastening means are unnecessary, as the fastening can be reliably achieved through targeted forming limited to specific sections. Moreover, the method provides a robust drive component that can be assembled with other components to form a drive assembly without any special preparations, fixings, or positional adjustments.

[0011] According to an advantageous embodiment, the recess is axially formed into the housing component at the housing opening, with the fixing projection, in particular, radially overlapping an end face of the stator component facing the housing opening. After completion of the first process step, the central axis of the stator component runs in the axial direction. By axially forming the recess, stress on the stator component is minimized and, in particular, limited to areas of the stator component that are of little functional relevance during operation. Such areas can also be concealed after the housing component is connected to other housing parts to prevent deformation of the fixing section due to interaction with the recess. Furthermore, simple fabrication of the fixing projection is possible even with large wall thicknesses of the housing component. The recess and / or fixing projection are particularly preferably formed on a flange section of the housing component.

[0012] Preferably, the fixing projection reduces the maximum opening cross-section of the housing opening. In particular, the stator component has a stator lamination stack, which is constructed from stacked stator laminations. The stator component, especially the stator lamination stack, forms a number of radially inwardly directed stator teeth. Preferably, the fixing projection is arranged axially, at least partially, adjacent to the stator lamination stack. In particular, the fixing projection rests against an axial end of the stator lamination stack, fixing the stator component relative to the housing component. The stator component can generally advantageously comprise a plastic jacket, wherein the plastic jacket preferably projects axially beyond the housing component, at least partially, and in particular forms an axial end of the stator component.

[0013] In an advantageous embodiment, the recess is formed in an area where, before the second process step, the housing component has at least one groove bounded by two groove walls and an intermediate groove bottom. In particular, to form the recess, material of the housing component is moved away from the groove perpendicular to the direction of recess formation on at least one of the groove walls to create the fixing projection. The fixing projection can thus be located next to the recess. Before the second process step, the groove preferably has an extent between the groove walls that is at most 20%, and more specifically at most 10%, of the extent of the recess in the same direction after completion of the second process step. The direction of formation is the direction of action of any force applied to the housing component to create the recess.Preferably, the insertion direction is axial. In particular, the recess is created by enlarging the cross-section of the groove. The fixing projection is preferably formed in an area adjacent to the groove. In particular, one of the groove walls transitions into the fixing projection after completion of the second process step. The groove is already provided before the second process step and, in particular, before the first process step. In particular, the groove is inserted during the manufacture of the housing component. In particular, the groove is pre-formed, especially together with the other areas of the housing component. Providing the groove makes it possible to predefine a direction for inserting the recess, in which material is moved away to form the fixing section. In particular, this prevents material of the housing component from being moved predominantly in the insertion direction towards the stator component.

[0014] According to a preferred embodiment, the recess on the outer surface of the housing is radially formed into the housing component. This makes fixing the stator component to the housing component particularly easy, as machining can be limited to easily accessible areas of the housing component. For example, when creating the recess by roll forming, a suitable rolling tool or a roll of a multi-roll rolling tool can be used on the outer surface of the housing to create the recess. In particular, after completion of the second process step, the fixing projection extends into a corresponding fixing structure on a radial outer surface of the stator component. The corresponding insertion direction for this type of recess formation is preferably radial. The fixing structure can be provided in various ways.In particular, the fixing structure can be provided by providing differently offset sections of the stator component.

[0015] According to one embodiment, several recesses are formed as described above, each with its own associated fixing projection. For example, in the second process step, a first recess can be formed axially into the housing component at the housing opening, forming a first circumferential fixing projection, while a second recess is formed radially into the housing component on the outside of the housing component, forming a second circumferential fixing projection. The first and second fixing projections permanently fix the stator component to the housing component. This ensures particularly reliable fixation. In preferred embodiments, however, a single recess is sufficient, so that in advantageous embodiments the recess is formed either radially or axially. This allows the stator component to be attached to the housing component more efficiently.

[0016] According to a generally advantageous embodiment, the second process step is carried out using at least one roller, in particular at least one profile roller. During the second process step, the roller rests against the housing component and is moved relative to the housing component in such a way that, under the application of a rolling force, it rolls circumferentially around the housing component, creating the recess. Thus, the roller presses against the housing component while being guided circumferentially around the housing component in the area for the recess. This results in an incremental and stepwise pressure forming of the housing component to form the fixing projection and create the recess. Known roll forming processes of this kind are usually only used for tempering a particular surface on which the respective roller rolls.However, the inventors have found that such methods are also suitable for creating accumulations of material next to the respective processing point or surface, and especially on surfaces opposite it, which are sufficient to provide a fixing projection as described above.

[0017] Generally, the introduction of the recess is advantageous because the material of the housing component in and / or around the area of ​​the fixing projection is compacted. Thus, in the area of ​​the recess, the housing component, and in particular the surfaces of the housing component bounding the recess, has a higher density than surrounding areas of the housing component. Specifically, after completion of the second process step, an area of ​​the housing component between the fixing projection and the recess has a higher density than an area of ​​the housing component located at least 10% away from it, relative to the maximum axial extent of the housing component.

[0018] In particular, when the recess is formed, adjacent material is moved into the recess to reinforce and / or enlarge the fixing projection. For example, by appropriately enlarging the recess and / or moving the tool used to form the recess perpendicular to the main direction of extension of the recess, material of the housing component, which was originally located outside the recess area, can be moved into the recess area and pressed towards the fixing projection. Specifically, during this movement of material into the recess, the extension of the fixing projection away from the recess increases.

[0019] According to one aspect of the invention, it comprises a drive assembly for an electric fluid pump. The drive assembly includes a housing component and a stator component for interaction with a corresponding rotor component as an electric drive. The stator component is fixed in the housing component by a method with features described above. Accordingly, the housing component and the stator component can each have features described above in connection with the method or the drive assembly described above.

[0020] The stator component of the drive assembly comprises, in particular, a stator lamination stack, which is preferably constructed from stacked stator laminations. However, it is also conceivable to construct at least a portion of the stator lamination stack not from stacked stator laminations, but as a sintered component. The stator component, in particular the stator lamination stack, has, in particular, a number of radially inwardly directed stator teeth on which a rotating field winding is arranged. In particular, the rotating field winding comprises at least one coil per phase, which is electrically connected to a first phase connection element and a second phase connection element. The phase connection elements are preferably designed as so-called press-fits and, in particular, project axially in the same direction. In particular, the drive assembly comprises a printed circuit board fixed relative to the housing component and / or the stator component.The phase connection elements are preferably electrically connected to semiconductor power components arranged on the circuit board of the drive assembly, in particular by being inserted into corresponding openings of the circuit board.

[0021] Advantageously, the housing component comprises a flange section extending away from the housing opening. In particular, the flange section has several fastening points for securing the housing component and, indirectly, the stator component to an external holding device and / or other components of a housing, such as an intermediate housing section and / or a pump housing. The fastening points can be, for example, snap-fit ​​sections, such as snap hooks, snap eyes, or the like, and / or receptacles for fasteners, such as screws, rivets, or the like. Preferably, the recess and / or the fixing projection is formed on the flange section. In particular, the recess is arranged radially between the stator component and the fastening points. In particular, the axial recess is arranged radially adjacent to the housing opening.Preferably, the drive assembly comprises at least one first sealing ring and one second sealing ring, with the radial recess arranged axially between the first and second sealing rings. According to one embodiment, the first and / or the second sealing ring is arranged between the stator component and the housing component. According to another embodiment, at least one of the sealing rings, in particular both the first and second sealing rings, is arranged on the outside of the housing. Preferably, at least one of the sealing rings is designed as an O-ring and / or an X-ring. The drive assembly advantageously includes a containment shell, preferably made of metal, for fluid-tight separation of the stator component from the interior of the containment shell. The stator component is preferably arranged radially between the containment shell and the housing component. Particularly preferably, the rotor is arranged within the interior of the containment shell.

[0022] Preferably, the stator component comprises a plastic jacket for at least partially fixing the rotating field winding and the stator lamination stack relative to each other. The plastic jacket is preferably manufactured by injection molding before the method is carried out, with the stator lamination stack preferably being at least partially embedded in the plastic jacket. Engineering plastics are particularly suitable for the plastic jacket. For example, the plastic jacket is made of PPS. In particular, the phase connection elements are fixed relative to the stator component via the plastic jacket. Preferably, at least a section of the radial outer surface of the stator lamination stack facing the inside of the housing is free of plastic from the plastic jacket. In particular, the stator lamination stack forms a maximum radial end of the stator component.

[0023] According to an advantageous embodiment, the stator component has a fixing structure corresponding to the fixing projection, in which the fixing projection is arranged. The fixing structure can be designed in various ways, with the fixing structure corresponding to the fixing projection in such a way that the fixing projection and the stator component interlock, forming a positive fit. For example, the stator component can have at least one groove for the fixing projection on its radial outer surface. According to one embodiment, the groove extends at least partially axially to provide anti-rotation protection in conjunction with the fixing projection. According to another embodiment, the groove extends at least partially along the circumference of the stator component to provide protection, in conjunction with the fixing projection, against axial relative movement of the housing component and the stator component.

[0024] According to an advantageous embodiment, in which the stator component comprises the stator lamination stack, the stator lamination stack has at least a number of first stator laminations and, in particular, an identical number of second stator laminations, wherein the first stator laminations are stacked alternately with the second stator laminations to form the stator lamination stack. The first stator laminations each have an outer contour that differs from the outer contour of the respective second stator laminations, such that between each pair of stator laminations of the first or second stator laminations, at least a partial recess and / or at least a partial protrusion is provided, which overlaps with the fixing projection. This allows a fixing structure consisting of a plurality of recesses and protrusions to be provided, which overlaps with the fixing projection.In particular, the fixing projection extends axially over several of the stator laminations and has an inner contour corresponding to the fixing structure, which includes a multitude of recessed sections and raised sections, each of which is complementary to the multitude of recesses and raised sections of the fixing structure.

[0025] According to one aspect, the invention also relates to a fluid pump comprising a drive assembly according to the invention. The drive assembly can advantageously have features described above in connection with the method or the drive assembly. According to the invention, the fluid pump further comprises a pump housing and a pump rotor for conveying fluid from an inlet to an outlet of the fluid pump. According to a preferred embodiment, the pump rotor is designed as an internal rotor or as an external rotor of a gerotor. According to another embodiment, the pump rotor can be designed as an impeller of the type of a centrifugal pump. According to the invention, the pump rotor is fixed in a rotationally fixed manner to a first section of a shaft of the fluid pump. The rotor component is fixed in a rotationally fixed manner to a second section of the shaft. The shaft is rotatably mounted between the pump rotor and the rotor component on the pump housing, in particular by means of a sliding bearing.

[0026] According to an advantageous embodiment, the fluid pump is axially divided into a pump section and a motor section with respect to an axis of rotation defined by the shaft. The housing component of the drive assembly defines the motor section perpendicular to the axis of rotation. The pump housing defines the pump section perpendicular to the axis of rotation. The pump housing and the housing component are fixedly connected, in particular indirectly via a separately designed intermediate housing section, which axially separates the motor section and the pump section. Preferably, the intermediate housing section has a bearing section for rotatably supporting the shaft. Particularly preferably, the bearing section additionally has a bearing surface for axially supporting the pump rotor, wherein the bearing surface extends around the bearing section.The intermediate housing section has, in particular, at least one fluid channel for the fluidic connection of at least one section of the motor area with the pump area. This allows fluid from the pump area to be supplied via the fluidic connection for cooling the electric drive during operation of the fluid pump.

[0027] According to an advantageous embodiment, the fluid pump comprises a printed circuit board for the electrical supply and / or control of the electric drive, wherein the printed circuit board is arranged axially next to the rotor and / or stator component. For example, the rotor and / or stator component can be arranged between the pump rotor and the printed circuit board. Advantageously, however, the printed circuit board can also be arranged between the pump rotor and the rotor and / or stator component, which can enable improved cooling of the printed circuit board and any semiconductor power components arranged thereon. In particular, the printed circuit board has a contact device, wherein the contact device is electrically connected to at least one phase connection element of the stator component.

[0028] According to an advantageous embodiment, the fluid pump comprises at least one temperature sensor for detecting the fluid temperature of the fluid pumped during operation and / or for detecting the operating temperature of the stator component. According to one advantageous embodiment, the temperature sensor is embedded in the plastic casing. According to another advantageous embodiment, the temperature sensor is arranged on the circuit board.

[0029] Further details, advantages and features of the invention can be found, without limiting the generality of the foregoing description, in the following explanation of preferred embodiments with reference to the accompanying figures.

[0030] They show: Fig. 1: an embodiment of a drive assembly according to the invention; Fig. 2: a section of an embodiment of a drive assembly according to the invention in sectional view; Fig. 3: Schematic views of the fixing of the housing component and the stator component according to exemplary embodiments of the method; Fig. 4: a section of an embodiment of a stator component of a drive assembly according to the invention.

[0031] In the exemplary embodiment, identical parts are provided with the same reference numerals. Fig. Figure 1 shows a partial embodiment of a drive assembly 4 according to the invention, comprising a stator component 1 and a housing component 2, which were fixed according to a method according to the invention. The housing component 2 has an outer housing surface 21, an inner housing surface 22, and a housing opening 23, from which areas of the stator component 1 arranged in the housing component 2 project. At the end of a flange section of the housing component 2, several fastening points are also provided for fastening to other housing components. The stator component 1 also has a series of phase connection elements designed as press-fits, which project axially towards an area on which a printed circuit board can be arranged. The drive assembly is designed for a fluid pump and has a containment shell, the base of which is Fig. Figure 1 shows the stator component 1 projecting axially from the housing component 2. The stator component 1 is arranged between the containment shell and the housing component 2.

[0032] Fig. Figure 2 shows a section of an embodiment of a drive assembly 2 according to the invention in sectional view. The position of a recess 31, 32 and a corresponding fixing projection 33, 34 are shown by way of example, without showing the shape of the respective recess 31, 32 or the respective fixing projection 33, 34. The housing component 4 has a stepped section in the area of ​​its flange section at the housing opening 23, in which a recess 31 is axially formed. Initially, a groove was provided in this area, so that when the recess 31 was formed, material of the housing component 2 was displaced predominantly perpendicular to the direction of insertion away from the groove to form the fixing projection 33, which thereby radially overlaps the end face of the stator component 1 facing the housing opening 23, such that the stator component 1 is permanently fixed to the housing component 2.

[0033] The stator component 1 has several stator teeth 11 on which a rotating field winding 12 is arranged. The stator teeth 11 are formed by a stator lamination stack consisting of a plurality of stacked stator laminations. The stator lamination stack is provided with a plastic jacket 13, which provides further contours of the stator component 1 and a receptacle for a phase connection element 15. The stator lamination stack is free of the plastic of the plastic jacket on its radial outer surface and rests radially against the housing component 2. A fixing structure 14 is provided on the radial outer surface of the stator component, which is formed by the radial outer surface of the stator lamination stack. The fixing structure 14 corresponds to a fixing projection 34, which was produced radially into the housing component 2 by a method according to the invention by introducing a recess 32 on the outer surface 21 of the housing.The stator component 1 is permanently fixed to the housing component 2 by the interaction of the fixing projection 34 and the corresponding fixing structure 14. The recess 32 is arranged axially between two O-rings, which, depending on the embodiment, may also be omitted, as they are intended in particular for the intended interaction with certain components of external devices.

[0034] Fig. Figure 3 comprises two merely schematic views a) and b) of the fixing of housing component 2 and stator component 1 according to exemplary embodiments of the method according to the invention, each relating to the second method step.

[0035] In view a), a schematic representation shows how a recess 32 is radially formed on the outer surface 23 of the housing component 2 by means of a schematically indicated roller. This displaces material radially from the area of ​​the recess 32, causing material to protrude from the inner surface 22 of the housing and flow into a number of recesses of a fixing structure 14 of the stator component 1, forming the fixing projection 34. This creates a positive fit due to the overlap of the fixing projection 34 and the fixing structure 14, and simultaneously generates a frictional fit, since material of the housing component is pressed against the stator component as the fixing projection 14.

[0036] Figure b) schematically shows the axial creation of a corresponding recess 31. A channel can be provided prior to the creation of the recess 31. This channel serves to deflect material from the housing component 2 displaced by the creation of the recess perpendicular to the direction of creation. Thus, by axially placing a roller (again schematically indicated) and moving the roller in a ring-shaped circumferential motion along the housing component under roll forming, material from the housing component 2 is displaced from the area of ​​the recess 31, i.e., moved away. The channel walls of the channel dictate the desired material movement, which is indicated by the arrow pointing to the left and a fixing projection 33 shown with a dashed line.In the second process step, the roller, through roll forming in the area of ​​the groove, moves material away from the groove perpendicular to an axial insertion direction, so that the fixing projection 33 is formed and placed radially over the stator component 1. This causes the fixing projection 33 to overlap with the stator component 1 in such a way that the stator component 1 is permanently fixed to the housing component 2.

[0037] Particularly when introducing the radial recess 32 and creating the corresponding fixing projection 34, it may be advantageous to contour the stator laminations of the stator lamination stack in such a way as to provide a fixing structure 14. This may, for example, comprise one or more slots 14.1, ribs 14.2, or the like. Fig.Figure 4 shows a section of an embodiment of a stator component 1 for a drive assembly 4 according to the invention. Only the stator laminations stacked to form a stator core are shown. These laminations form stator teeth 11 on the inside according to their contour and provide a fixing structure 14 on the outside. The fixing structure is provided by the fact that each stator lamination has a recess at the same position, which, when joined together, forms an axially extending groove 14.1. Material from the housing component 2 can enter the groove 14.1 when the fixing projection is created, particularly to secure it against relative rotation. The groove 14.1 is open axially at its end, but can also be closed at the end. Furthermore, a plurality of ribs 14.2 are created by the different outer contours of the respective stator laminations.These are provided by alternately stacking a number of first stator laminations and a number of second stator laminations, the first stator laminations having an outer contour that differs from the outer contour of the respective second stator laminations. The radially larger extent of each second stator lamination, relative to adjacent stator laminations, results in a rib 14.2 that extends at least partially along the circumference of the stator component 1. A gap is thus formed between each pair of ribs 14.2, into which material of the housing component 2 can enter when the fixing projection 34 is created. This provides a positive locking mechanism to prevent axial relative movement between the stator component 1 and the housing component 2. Reference symbol list 1 Stator component 2 Housing component 4 Drive assembly 5 Fluid pump 6 rolls 11 stator teeth 12 Rotating field winding 13 plastic coating 14 Fixing structure 15 Phase connection element 21 Case exterior 22 Inside of the case 23 Case opening 31, 32 In-depth study 33, 34 Fixing projection QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] EP 4230869A1

[0002]

Claims

[1] Drive assembly manufactured by a method for fixing a stator component (1) in a housing component (2), in particular a metallic one, wherein the housing component has a housing outer surface (21), a housing inner surface (22) and a housing opening (23) at the front characterized by , that starting from a first process step in which the stator component (1) is arranged on an inner side of the housing component, In a second process step, a circumferential recess (31, 32), in particular a bead, is introduced into the housing component on the outside of the housing, forming a circumferential fixing projection (33, 34), wherein the fixing projection permanently fixes the stator component (1) to the housing component. [2] Drive assembly according to claim 1, characterized by, that the recess at the housing opening is axially inserted into the housing component, wherein in particular the fixing projection radially overlaps with an end face of the stator component (1) facing the housing opening. [3] Drive assembly according to one of claims 1 or 2, wherein the recess is introduced into an area in which the housing component has at least one groove which is bounded by two groove walls and a groove bottom extending between them, wherein in particular when introducing the recess on at least one of the groove walls material of the housing component is moved away from the groove perpendicular to an introduction direction (E) to form the fixing projection. [4] Drive assembly according to any one of claims 1 to 3, characterized by, that the recess on the outside of the housing is radially inserted into the housing component, wherein in particular the fixing projection extends into a corresponding fixing structure (14) on a radial outside of the stator component (1). [5] Drive assembly according to one of claims 1 to 4, wherein when the recess is introduced, material of the housing component is compacted in and / or around the area of ​​the fixing projection. [6] Drive assembly according to one of claims 1 to 5, wherein the second process step is carried out using at least one roller (6), in particular a profile roller, which rolls around the housing component, creating the recess. [7] Drive assembly according to claims 1 to 6, wherein when the recess is formed, adjacent material is moved into the recess to reinforce it. [8] Drive assembly according to one of claims 1 to 7, in particular for an electric fluid pump, comprising a housing component (2) and a stator component (1) for interaction with a corresponding rotor component as an electric drive. [9] Drive assembly according to claim 8, wherein the stator component (1) has a stator lamination stack with a number of inwardly directed stator teeth (11) on which a rotating field winding (12) is arranged, wherein in particular the stator component comprises a plastic jacket (13) for at least partially fixing the rotating field winding and the stator lamination stack relative to each other, characterized by , that the stator component has a fixing structure (14) corresponding to the fixing projection, in which the fixing projection is arranged. [10] Fluid pump (5) comprising a drive assembly (4) according to one of claims 8 or 9, further comprising a pump housing and a pump rotor for conveying fluid from an inlet to an outlet of the fluid pump, wherein the pump rotor is fixed non-rotatably to a first section of a shaft and the rotor component is fixed non-rotatably to a second section of the shaft, wherein the shaft is rotatably mounted on the pump housing between the pump rotor and the rotor component, wherein in particular a motor compartment of the fluid pump, in which the rotor component is arranged, is fluid-connected by at least one fluid channel with inlet and outlet.

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