Drive device having brushless electric motor

Abstract

The invention relates to a drive device (1, 1 '), comprising: a brushless electric motor (4) having a stator (5) with a rotating field winding or stator winding (6) and a hollow cylindrical stator carrier (18); a driver housing (2); the invention relates to a drive for a motor vehicle, comprising a drive housing (2), a stator carrier (18), and a connecting element (19) for the form-fitting fixation of the stator carrier (18) in the drive housing (2), the connecting element (19) having a main body (19a) with an engagement element (26) for the form-fitting connection to the stator carrier (18) and with a latching hook (27) for locking the stator (5) in the drive housing (2), and wherein the engagement element (26) has an engagement element (26) for the form-fitting connection to the stator carrier (18) and with a latching hook (27) for latching the stator (5) in the drive housing (2). The drive housing (2) has an engagement contour (37) which cooperates with a latching hook (27) of the connecting element (19).

Description

Technical Field

[0001] The invention relates to a drive device of a motor vehicle, in particular an electric adjustment drive, preferably a seat adjustment drive, having a brushless electric motor designed as an outrunner. Background Art

[0002] A drive device, such as an electric adjusting drive in a motor vehicle, which drives an adjusting element along an adjustment path between two end positions, typically comprises an electric motor with a stator and a rotor. The stator can be accommodated in a drive housing or an electronics housing. If a transmission is coupled to the electric motor or its rotor, it can be arranged in a separate housing part (transmission housing) of the drive housing.

[0003] Drive devices with a transmission arranged in a drive housing or transmission housing, in particular a 90° commutation transmission (worm gear), are used, for example, as window lift drives in motor vehicles. The electric motor accommodated in the drive housing or transmission housing can be a brushed (internal rotor) commutated motor or a brushless external rotor motor. In brushless, electrically or electronically commutated electric motors, their stators have a rotating field winding (stator winding) and a permanent-magnet rotor that has or is mounted on a motor shaft or rotor shaft that is coupled or can be coupled to the transmission.

[0004] DE 10 2016 216 888 A1 discloses a drive device for a window lifter in a motor vehicle, in which a brushless electric motor (outer rotor motor) and the motor electronics for controlling it are housed in a drive housing or transmission housing. The brushless (electrically or electronically commutated) electric motor has a stator and a rotor (outer rotor) with a rotor shaft (drive shaft) that carries a counter-axially fixed worm of a worm gear as a 90° reversing gear. The worm gear is coupled to a cable drum, on which a traction cable for a follower of a guide rail for a window pane is wound in a plurality of cable windings or coils.

[0005] The stator has a stator body with a number of star-shaped stator teeth, around which the coils of the rotating field winding are wound. The stator body rests on a sleeve-shaped or hollow-cylindrical stator carrier, which is connected to the transmission housing and through which a rotor shaft or drive shaft, which is rotationally fixedly connected to the rotor, passes. The transmission housing at least partially accommodates the motor unit, with the stator being connected to a stationary housing section of the transmission housing via the sleeve-shaped stator carrier.

[0006] The stator carrier fulfills several functions in a drive device, in particular the connection and establishment of the connection of the stator to the drive housing or transmission housing, the establishment of a rigid connection to the stator body, which is preferably designed as a stator laminated core, the bearing of the (rotor) shaft, in particular by means of a (radial or sliding) bearing arranged in a sleeve-like or sleeve-shaped stator body, and / or ensuring good rotational operation of the rotor relative to the stator. Summary of the Invention

[0007] The object of the present invention is to provide a particularly suitable drive device, in particular a suitable seat adjustment drive for a motor vehicle. A reliable connection between a stator carrier (hollow cylindrical or sleeve-like) or a stator with a stator carrier and the drive housing should be provided. In particular, a suitable axial locking or a suitable anti-twist locking of the stator (with the stator carrier) in the housing should be provided.

[0008] According to the invention, this object is achieved with the features of claim 1. Advantageous embodiments and developments are the subject matter of the dependent claims (subclaims).

[0009] In particular, a drive device provided and configured as an electric seat adjustment drive for a motor vehicle comprises a brushless outboard electric motor and a drive housing as well as a preferably separately provided connecting element.

[0010] The electric motor has a stator with a rotating field winding or stator winding, in particular formed from individual coils, and a sleeve-shaped or hollow-cylindrical stator support. The electric motor has a rotor, particularly surrounding the stator and equipped with permanent magnets, with a rotor shaft coupled thereto, which is guided through the hollow-cylindrical stator support. The stator has a stator body, in particular in the form of a laminated core. The stator support protrudes axially at at least one stator end face. Connecting elements serve to form-lock the stator support or the stator in a drive housing. Here and hereinafter, the drive housing is also understood to mean a transmission housing or an electronics housing, in particular also as a housing part of the drive housing.

[0011] The drive housing has an electronics compartment and a housing channel, in which the stator, together with the stator support or the preassembled stator-rotor assembly of the electric motor, is accommodated or can be inserted. The hollow-cylindrical stator support can be designed as a sintered component or preferably a plastic component. The bearings or bearing points of the rotor shaft can be mounted in this component serving as the stator support.

[0012] The rotating field winding or stator winding has a certain number of coil connection wires or (phase) connection wires. These connection wires are preferably guided within an electronics compartment associated with the drive housing at corresponding contact points or connection points on a printed circuit board in order to connect the corresponding coils of the stator to form the rotating field winding or stator winding (for example, in a star or delta connection).

[0013] The separate connecting element is expediently a plastic part or a plastic clip. The connecting element has a body which at least partially or regionally surrounds or encircles the stator carrier, preferably at least almost completely, and has at least one engagement element for a positive-locking connection to the stator carrier and at least one engagement element, in particular in the form of a latching hook, for locking the stator in the drive housing.

[0014] The driver housing has an engagement contour that cooperates with the latching hooks of the connecting element. This engagement contour is suitably arranged in the area of ​​the electronics compartment or in the area between the electronics compartment and the housing channel. The housing-side engagement contours of the respective latching hooks associated with the connecting element, in particular of the latching hook pair, are advantageously designed as undercuts of the latching hooks.

[0015] When the stator, together with the associated stator carrier, is placed in the drive housing or transmission housing or housing channel and the connecting element is mounted thereon, particularly in a pre-assembly step, one or each stator-side or stator carrier-side latching hook of the connecting element engages behind the housing-side undercut. This locks the stator axially in the transmission housing and prevents it from accidentally slipping out of the transmission housing or drive housing.

[0016] In an advantageous embodiment, the body of the connecting element is annular. At least one engagement element for locking the connecting element to the stator support and at least one latching hook for locking the stator or the stator support in the transmission housing or the drive housing are integrally formed on the body of the connecting element.

[0017] According to a suitable refinement, the connecting element has a plurality of axial grooves, in particular corresponding to the number of (phase) connecting wires, for accommodating connecting wires, in particular those bent radially. The axial grooves are arranged, for example, in a comb-shaped profile of the connecting element in a receiving grid. This receiving grid is oriented tangentially (with respect to the annular body of the connecting element or with respect to the circular periphery of the stator support) in a suitable manner and is radially spaced apart from the stator support.

[0018] According to another suitable improvement, the stator support has radially raised axial reinforcement ribs or axially extending radial ribs. The connecting element has radial grooves on its body corresponding to the axial reinforcement ribs (radial ribs) on the stator support side, which are used to lock the connecting element against rotation relative to the stator support.

[0019] In one suitable embodiment, the connecting element comprises a form-locking element, and the transmission housing comprises a form-locking contour cooperating with the form-locking element, in particular in the area of ​​the electronics compartment or in the area between the electronics compartment and the housing channel. The form-locking element of the connecting element is in particular an engagement pin or an engagement rib protruding axially from the main body, and the form-locking contour on the housing side is suitably a corresponding engagement groove.

[0020] Particularly advantageously, the connecting element comprises a pair of latching hooks, each offset by 180°, on the body. The latching hooks, arranged opposite one another on the circumference of the body, are advantageously components of spring-elastic latching arms that extend axially (with respect to the axis of rotation of the electric motor or its rotor or rotor shaft) and can be deflected radially inward or outward. Three, four, five, or more latching hooks can also be arranged at an angular distribution of 120°, 90°, or 72°.

[0021] When the stator, together with the associated stator carrier, is inserted into the transmission housing or the driver housing or the housing channel, and the connecting element is mounted thereon, in particular in a pre-assembly step, the latching hooks are pivoted along the housing contour or the engagement contour so as to subsequently engage the housing contour or the engagement contour from behind after the latching arms have rebounded. In other words, the housing-side engagement contour of the respective latching hooks associated with the connecting element is suitably designed as an undercut or functions as an undercut, into which the respective latching hooks engage from behind when the stator is inserted into the transmission housing or its housing channel.

[0022] Furthermore, the main body of the connecting element advantageously comprises a pair of latching elements comprising latching elements offset by 180°. The latching elements, arranged opposite one another on the circumference of the main body, are expediently components of spring-elastic latching arms that extend axially (with respect to the axis of rotation of the electric motor or its rotor or rotor shaft) and can be deflected radially inward or outward. Three, four, five, or more engaging elements or latching elements may also be provided.

[0023] These engaging or latching elements are expediently arranged approximately or exactly at the locations of the latching hooks or corresponding latching hook pairs of the main body of the connecting element, but preferably extend in opposite (axial) directions. It is therefore important that the force flow through the connecting element takes place over the shortest possible path, that the connecting element as a component deforms as little as possible during operation and during assembly, and that the least possible component stress is generated.

[0024] By means of these engaging or latching elements, the preferably annular connecting element is positively locked on the stator carrier (in particular to prevent axial displacement on the stator carrier). For this purpose, the stator carrier suitably has, in particular, flange-shaped latching openings or latching recesses corresponding to the respective engaging or latching elements, into which the engaging or latching elements engage or latch into when the connecting element is mounted on the stator carrier.

[0025] According to one embodiment of the connecting element, its annular body has a joint slot, which includes a joint element or a pair of joint elements arranged thereon. When the connecting element is mounted on the stator carrier, the joint elements engage behind one or more radially raised axial reinforcement ribs or one or more axially extending radial ribs of the stator carrier. Due to the joint slot, the body of the connecting element forms two approximately semicircular or semiannular spring arms that can be radially deflected and pivot inward when the joint slot narrows.

[0026] When the stator is inserted into the transmission housing or its housing channel, the engagement element of the connecting element engages from behind behind the radially raised axial reinforcement ribs of the stator carrier and is locked by the housing-side locking contour. The annular main body's joint seam advantageously performs a dual function. Specifically, it also forms one or more radial grooves corresponding to the axial reinforcement ribs (radial ribs) on the stator carrier, which serve to lock the connecting element against rotation relative to the stator carrier.

[0027] Another suitable development provides that the stator is assigned a stator insulator which at least partially surrounds the stator body, which is embodied as a stator laminated core, for example, in a region. Furthermore, the stator carrier can be a plastic component or a plastic injection-molded part. The stator insulator or stator carrier advantageously has a radially raised profile with slots for receiving the (phase) connecting conductors, which are advantageously bent radially. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The following describes an embodiment of the present invention in conjunction with the accompanying drawings.

[0029] Figure 1 A perspective view shows a drive device designed as a vehicle seat adjustment drive for a motor vehicle, having a drive housing for accommodating an electric motor designed as an outboard motor;

[0030] Figure 2 Along Figure 1 The cross-sectional view along line II-II in FIG. 1 shows the driving device;

[0031] Figure 3 A perspective view shows a stator of an electric motor with a rotating field winding or stator winding and a stator carrier with a stator body and a hollow-cylindrical stator support;

[0032] Figure 4 and Figure 5 A first variant of a connecting element is shown in the various views, which has an annular body and latching hooks and engagement elements integrally formed thereon;

[0033] Figure 6 Shown in perspective Figure 3 The stator has a Figure 4 and Figure 5 a connecting element mounted on the stator support;

[0034] Figure 7 The perspective view looking towards the electronics compartment shows the Figure 6 The stator is positioned for assembly before being placed in the drive housing shown in section;

[0035] Figure 8 A top view of a stator inserted into a drive housing shown in section;

[0036] Figure 9 Based on Figure 2 sectional view shows the stator locked in the drive housing shown in section by means of a connecting element;

[0037] Figure 10 and Figure 11 A second variant of the connecting element is shown in different views, which has an annular body, an engagement element and a latching hook;

[0038] Figure 12 The stator is shown in a perspective view with Figure 10 and Figure 11 A connecting element of a second variant mounted on a stator support;

[0039] Figure 13 A stator is shown in section with a second variant of a connecting element attached to a stator support (looking towards the radially raised axial reinforcement ribs of the stator support) and a joining element cooperating therewith at the joining seam of the connecting element;

[0040] Figure 14 The (partially cutaway) perspective view shows a fragmentary Figure 13 A stator inserted into the drive housing, the stator having an engagement element of the connecting element, which is locked by means of a locking contour on the housing side; and

[0041] Figure 15 A perspective view shows a drive device provided and configured as a window lift drive, which has a drive housing and an electric motor designed as an outer rotor accommodated therein.

[0042] Parts that correspond to one another are marked with the same reference numerals in all the figures. DETAILED DESCRIPTION

[0043] Figure 1 and Figure 2 In perspective or along Figure 1 The longitudinal section along the line II-II in FIG shows an electric motor drive device 1 preferably provided as a seat adjustment drive for a motor vehicle. The drive device 1 comprises a drive housing 2, also referred to below as the housing, which has a housing channel 3, through which an electric motor 4, designed as an outboard motor, is introduced into the housing 2.

[0044] The electric motor 4 has a stator 5 with a stator winding or rotating field winding 6 and a rotor 7 surrounding it. The rotor has a rotor housing 8, which is in particular cup-shaped or cap-shaped, and has permanent magnets 9 arranged on its cylindrical inner wall. The rotor housing 8 (and thus the rotor 7) is connected to the motor shaft 10 in a rotationally fixed or axially fixed manner. To this end, the rotor housing 8 has a shaft through-hole 8a that projects into the housing channel 3 and is press-fitted with the motor shaft 10. The stator 5 has a stator body 5a, which is preferably embodied as a laminated core composed of stacked stator laminations and is at least partially or partially covered or sheathed with a stator insulator 5b.

[0045] The motor shaft 10 is introduced into the (drive) housing 2 through a shaft passage 11 of a stator assembly 12 and is rotatably supported there in housing-side bearings 13, in particular radial bearings and / or plain bearings. A shaft section of the motor shaft 10, on which a worm 14 is arranged in a rotationally fixed or axially fixed manner, is introduced into a housing component 15. This housing component 15 surrounds the housing channel 3 of the housing 2 of the drive device 1, which is configured as a seat adjustment drive, in a sleeve-like manner.

[0046] The motor shaft 10 is rotatably mounted in a stator assembly 12, which is provided with at least one bearing 16, in particular a bearing preferably designed as a radial bearing and / or a plain bearing. A further bearing 17 is arranged in the housing part 15. The worm 14 meshes with a drive gear in a manner not shown in detail, for example, to form a (90°) steering gear.

[0047] The stator component 12, which together with the stator winding or rotating field winding 6 forms the stator 5, has a stator carrier 18, on which are arranged connecting elements 19. The stator winding or rotating field winding 6 has connecting wires 20 which preferably serve as phase terminals.

[0048] In these figures, the axial direction A and the radial direction R are indicated by arrows, and the rotation axis or motor axis of the motor shaft 10 (rotor shaft or drive shaft) of the electric motor 4 is indicated by D, which is shown in dashed lines.

[0049] Figure 3The stator 5 is shown with a stator assembly 12 that carries a stator winding or rotating field winding 6. The stator body 5a of the stator 5 has stator teeth 21 arranged in a star shape. These stator teeth 21 are provided with stator insulators 5b, for example in the form of a cap-shaped coil covering or at least partially a plastic sheath, forming end-side free surfaces (pole shoes) 22. The stator insulators 5b, which at least partially cover the star-shaped, radially outward-facing stator teeth 21, are wound together with the stator teeth 21 by coils 6a that form the stator winding or rotating field winding 6. The coil ends of these coils are partially connected to one another, with some of the coil ends being led out as (phase) connecting wires 20.

[0050] The stator assembly 12 or the stator 5 has a hollow-cylindrical or sleeve-shaped stator support 18. In the exemplary embodiment, the stator support 18, which protrudes axially beyond the stator body 5a, is a plastic component molded onto the stator insulator 5b. However, it can also be embodied as a sintered component and inserted into the stator body 5a or pressed into it. The motor shaft or rotor shaft 10 of the electric motor 4 is or has been introduced into the housing 2 via the hollow-cylindrical stator support 18.

[0051] In the exemplary embodiment, the six connecting wires 20, which are routed and provided as phase terminals for the stator winding or rotating field winding 6, are guided in insertion slots 24 of a profile 25 that is raised (radially) in the radial direction R. The connecting wires 20 are bent radially outside the insertion slots 24 (on the side of the profile 25 facing away from the stator body 5a). The profile 25 with the insertion slots 24 is suitably molded onto the stator support 18. In particular, when a cap-shaped coil cover (slot box insulator) is used as the coil insulation 5b, the profile 25 with the insertion slots 24 can also be molded onto the coil insulation.

[0052] Figure 4 and Figure 5 Two different views show a first variant of a connecting element 19. The connecting element 19 is provided and designed to securely connect the stator 5 or the stator assembly 12 to the stator carrier 18 and to the stator winding or rotating field winding 6 by means of a positive connection with the stator carrier 18 on the one hand and with the housing 2 on the other hand, or to securely hold them therein.

[0053] A "positive fit" or "positive connection" between at least two interconnected components is understood here and hereinafter to mean in particular that the connection of the interconnected components is achieved in at least one direction by direct engagement of the contours of the components themselves or by indirect engagement via additional connecting components. The "stopping" of the mutual movement in this direction is thus achieved in a form-limited manner.

[0054] The locking achieved here between the stator carrier 18 and the transmission housing 2 by means of the connecting element 19 is preferably, on the one hand, an axial locking of the stator 5 or the stator assembly 12 against slipping out of the housing 2 in the axial direction A. On the other hand, the locking is particularly a rotational locking of the stator 5 or the stator assembly 12 within the housing 2 or of the connecting element 19 relative to the stator carrier 18 on which it rests in the installed state. This (first) variant of the connecting element 19 is particularly suitable for a stator carrier 18 made of plastic.

[0055] The connecting element 19 is preferably a plastic component or a plastic clip. The connecting element 19 has an annular body 19a, with which the connecting element 19 practically completely surrounds or encloses the stator carrier 18. In addition, the connecting element 19 has an engagement element 26, which is designed here as a pair of latching elements, for a positive connection with the stator carrier 18, and a latching hook 27, which is designed here as a pair of latching hooks, for locking the stator 5 or the stator carrier 18 in the transmission housing 2.

[0056] The latching hooks 27 are arranged offset by 180° on the body 19a of the connecting element 19. The latching hooks 27 arranged opposite each other on the circumference of the body 19a are components of spring-elastic latching arms that extend axially (with respect to the axis of rotation D of the electric motor 4) and can be deflected radially inwards or outwards.

[0057] The engaging or latching elements 26, which are designed as latching elements and are arranged opposite each other on the circumference of the main body 19a at an angle of 180°, are components of spring-elastic latching arms that extend axially and can be deflected radially inward or outward. These engaging or latching elements 26 are arranged at the locations of the latching hooks 27, or at the locations of the corresponding pairs of latching hooks on the main body 19a of the connecting element 19, and extend in opposite axial directions A. By means of these engaging or latching elements 26, the annular connecting element 19 is held on the stator support 18 in a form-fitting manner and simultaneously locked against axial displacement on the stator support 18. For this purpose, the stator support 18 has corresponding latching openings or latching recesses 28 ( Figure 3 ), the corresponding engaging element or locking element 26 is embedded or locked into the locking opening or locking recess 28 when the connecting element 19 is installed on the stator support 18.

[0058] The connecting element 19 has a comb-shaped profile 29 with a number of axial slots 30 for accommodating the radially bent connecting wires 20 of the stator winding or rotating field winding 6. The axial slots 30 are arranged in a receiving grid. This receiving grid is oriented tangentially (with respect to the annular main body 19a of the connecting element 19 or with respect to the circumference of the stator support 18) and is radially spaced apart from the stator support 18. The connecting element 19 also has radial slots 31 in its main body 19a. Furthermore, the connecting element 19 has form-locking elements 32 in the form of engaging pins or engaging ribs that protrude axially (in the axial direction A) beyond the main body 19a.

[0059] For example, especially in Figure 3 as well as Figure 12 and Figure 13 As can be seen in the figure, the stator support 18 has radially raised axial reinforcement ribs 33 or axially extending radial ribs. When the connecting element 19 is fitted or pushed onto the stator support 18, the support-side axial reinforcement ribs (radial ribs) 33 engage with the radial grooves 31 of the connecting element 19. As a result, the connecting element 19 is arranged on the stator support 18 in a rotationally fixed manner or in a predetermined position or defined position thereon.

[0060] Figure 6 and Figure 7 The stator 5 or stator assembly 12 is shown with the connecting element 19 already mounted on the stator carrier 18 in a pre-assembly step. The assembly 12 with the stator body 5a carrying the stator insulator 5b and the stator carrier 18, as well as the stator 5 with the stator winding or rotating field winding 6 and the connecting element 19 mounted thereon, has the significant advantage that the (phase) connecting conductors 20 of the stator winding or rotating field winding 6 are already aligned in this assembly step or in the assembled state by means of the connecting element 19 (with its comb-shaped profile 29 having axial slots 30) pushed onto the stator carrier 18 and are fixed or secured in this position.

[0061] During the installation of the connecting element 19 on the stator carrier 18, the spring-elastic engagement elements or latching elements 26 are initially deflected radially outwards in order to engage at or at the location of the latching openings or latching recesses 28 on the carrier side. When the connecting element 19 is installed on the stator carrier 18, the radially bent connecting wires 20 of the stator winding or rotating field winding 6 engage in the axial grooves 30 of the connecting element 19. Prior to this, the insertion grooves 24 of the stator carrier 18, or their contours 25, can be deformed, in particular to secure the connecting wires 20 at the desired location.

[0062] For example, from Figure 7 and Figure 8It can be seen that the housing 2 has a form-locking contour 34 that cooperates with the form-locking element 32 of the connecting element 19. This form-locking contour 34 is preferably arranged in a partition wall or intermediate wall 36 of the housing 2 in the area between the electronics compartment 35 and the housing channel 3 of the housing 2. The stator 5 is introduced into the housing 2 through the housing channel 3 together with the stator assembly 12 and the stator winding or rotating field winding 6 and the mounted connecting element 19.

[0063] For example, from Figure 9 As can be seen, when the stator 5 is introduced into the housing 2, the latching hooks 27 of the connecting element 19, which is located on the stator carrier 18, latch onto a housing contour or engagement contour 37 of the housing 2, which acts as an undercut. To this end, the latching hooks 27 engage the housing-side engagement contour 37 from behind, depending on the desired position or orientation of the stator 5 in the housing 2. In this position of the stator 5 in the transmission housing 2, another housing contour 38 of the housing 2, particularly a channel-shaped one, secures the positive connection between the stator carrier 18 and the connecting element 19. Specifically, the housing contour 37 prevents radial deflection of the engagement or latching element 26. The stator 5 is thus securely fixed or reliably locked in the housing 2, preventing it from slipping out axially. The axial grooves 30 of the connecting element 19 securely (particularly with accurate positioning and orientation) accommodate the radially bent-over connecting wires 20 of the stator winding or rotating field winding 6. The connecting wires 20 are supported in their intended orientation and securely positioned, in particular for trouble-free contacting at corresponding connecting points of a printed circuit board (not shown here) accommodated in the electronics compartment 35 .

[0064] Figure 10 and Figure 11 A second variant of a connecting element 19 is shown in various views, which is particularly suitable for a sintered stator carrier 18. The connecting element 19 is also designed and configured to securely connect the stator 5 or the stator assembly 12 to the stator carrier 18 and the rotating field winding 6 by means of a positive connection with the stator carrier 18 on the one hand and with the housing 2 on the other hand, or to securely retain them therein. The second variant of the connecting element 19 differs from the first variant in the type of engagement element 26 used for the positive connection or retention of the connecting element 19 to or on the stator carrier 18.

[0065] According to a second variant of the connecting element 19, its annular main body 19a has a joint slit 39 with radial pins or radial projections arranged thereon as the engaging elements 26 or engaging element pairs. This engaging element or joint slit 39 is arranged on the side of the annular main body 19a opposite the pin-shaped or rib-shaped form-locking element 32 (i.e., offset by 180°). Due to the joint slit 39, the main body 19a of the connecting element 19 is divided, forming approximately semi-annular or semi-circular latching arms or spring arms 19b. These latching arms or spring arms 19b can be deflected radially outward and guided toward each other or pressed together, thereby reducing the slot width or slot opening of the joint slit 39.

[0066] The joining slot 39, in particular together with the radial pins located on its sides as joining elements 26 (analogously to the radial grooves 31 of the first variant), forms a corresponding contour to the axial reinforcement or radial ribs 33 of the stator carrier 18, which serves as an anti-twist lock for the connecting element 19. Furthermore, the radial pins as joining elements 26, in cooperation with the spring arms 19b of the body 19a of the connecting element 19, assume the function of axially locking the stator 5 in the housing 2.

[0067] Figure 14 The stator 5 is shown inserted into the housing 2 through the housing channel 3 and has a second variant of the connecting element 19 on the stator carrier 18. It can be seen that the connecting elements 26 of the connecting element 19, which are located laterally from the joint 39, and the axial reinforcement ribs 33 of the stator carrier 18 are embedded in the positive-locking contour 34 on the wall of the housing 2.

[0068] The housing-side positive-locking contour 34 forms a retaining contour 40 on or together with the lateral edges. When the joining element 26 of the connecting element 19 presses into the corresponding housing-side positive-locking contour 34, the retaining contour 40 presses the joining element 26 together while reducing (shortening) the gap width of the joining gap 39. The joining element 26 engages from behind radially raised axial reinforcement ribs 33 of the stator carrier 18. When the stator 5 is inserted into the housing 2 or its housing channel 3, this rearward engagement or hook is locked by the housing-side retaining contour 40. The joining gap 39 of the annular main body 19a of the connecting element 19 thus performs a dual function. Specifically, it also forms radial grooves 31 corresponding to the stator carrier-side axial reinforcement ribs (radial ribs) 33, which serve to secure the connecting element 19 against rotation relative to the stator carrier 18.

[0069] Figure 15A motor drive device 1', particularly suitable as a window lift drive, is shown. It has a (drive) housing 2, specifically composed of a transmission housing part 2a and a motor housing part 2b. An electric motor 4, designed as an outboard motor, is inserted into this housing 2 with a stator assembly 12 having a stator winding or rotating field winding 6, secured against rotation and axially locked by means of connecting elements 19. The transmission housing part 2a and the motor housing part 2b are releasably connected to each other by means of a flange connection, preferably screwed together using flange screws 41, to form the drive housing 2. A non-releasable connection, such as a welded connection, may also be provided. In the exemplary embodiment, the outboard electric motor 4 drives a cable drum 42 of the window lift as an output element via a transmission in a manner not shown in greater detail.

[0070] The transmission is a 90° steering transmission, specifically a worm gear. Its (not visible) worm gear, located in the transmission housing part 2a and coupled to a cable drum 42 of a motor vehicle window regulator, around which a traction cable is wound, meshes with a (not visible) worm gear driven by an outboard motor 4. The worm gear is mounted, in a manner not shown in detail, on the drive shaft or rotor shaft of the electric motor, with the rotor of the electric motor being connected to the rotor shaft in a rotationally fixed manner. A connector plug 43 with connection lines 44 for supplying power and voltage to the drive unit 1' and for inputting and / or outputting control and / or sensor signals is inserted into a connector receptacle on the housing side.

[0071] In summary, the invention relates to a drive device 1 having a brushless electric motor 4 with a stator 5 having a rotating field winding or stator winding 6 and a hollow-cylindrical stator carrier 18, a drive housing 2, and a connecting element 19 for form-fitting fixation of the stator carrier 18 in the housing 2, wherein the connecting element 19 has a preferably annular body 19a with an engagement element or a pair of latching elements 26 for form-fitting connection with the stator carrier 18 and a latching hook or a pair of latching hooks 27 for latching the stator 5 in the housing 2, and wherein the housing 2 has an engagement contour 37 that cooperates with the latching hooks 27 of the connecting element 19 and in particular forms an undercut.

[0072] The claimed invention is not limited to the aforementioned exemplary embodiments. Rather, a person skilled in the art will be able to derive further variations of the invention within the scope of the disclosed claims without departing from the subject matter of the claimed invention. Furthermore, in particular, all individual features described in conjunction with the various exemplary embodiments may also be combined in other ways within the scope of the disclosed claims without departing from the subject matter of the claimed invention.

[0073] The described solution can be used not only in the specifically shown application, but also in similar embodiments for other motor vehicle applications, for example in door and tailgate systems, in locks, in interior systems and in other electrically driven devices in the vehicle.

[0074] Reference Signs List

[0075] 1. 1' drive equipment

[0076] 2 Driver housing / housing

[0077] 2a Transmission housing part

[0078] 2b Motor housing section / housing channel

[0079] 4 Electric motor / external motor

[0080] 5 Stator

[0081] 5a Stator body

[0082] 5b Stator insulator

[0083] 6 Stator winding / rotating field winding

[0084] 6a Coil

[0085] 7 rotor

[0086] 8 Rotor housing

[0087] 8a Shaft through hole

[0088] 9 permanent magnets

[0089] 10 Motor shaft

[0090] 11 Shaft penetration

[0091] 12 stator assembly

[0092] 13 bearings

[0093] 14 Worm

[0094] 15 Housing components

[0095] 16 Bearing position

[0096] 17 Bearings

[0097] 18 stator bracket

[0098] 19 Connecting elements

[0099] 19a Main Body

[0100] 19b Latch arm / spring arm

[0101] 20 phase / connection wires

[0102] 21 stator teeth

[0103] 22 Free Surface

[0104] 24 slots

[0105] 25 Outline

[0106] 26 Engaging element / locking element

[0107] 27 Locking hook / locking hook pair

[0108] 28 Locking opening / locking recess

[0109] 29 Comb-shaped parts

[0110] 30 Axial groove

[0111] 31 radial grooves

[0112] 32 Positive-locking element / joining pin / joining rib

[0113] 33 Axial reinforcement / radial ribs

[0114] 34 Form-locking contours

[0115] 35 Electronics Bay

[0116] 36 Divider wall / intermediate wall

[0117] 37 Shell profile / joint profile

[0118] 38 Shell Profile

[0119] 39 Seam

[0120] 40 Stop contour

[0121] 41 Flange bolts

[0122] 42 Cable drum

[0123] 43 Connecting plug

[0124] 44 connection lines

[0125] A Axial direction

[0126] D Rotation axis

[0127] R radial direction

Claims

1. A drive device (1, 1'), in particular an electric seat adjustment drive for a motor vehicle, comprising: - a brushless electric motor (4) having a stator (5) with a rotating field winding or stator winding (6) comprising a number of connecting wires (20) and a stator carrier (18) in the form of a sleeve or hollow cylinder, - a drive housing (2) having a housing channel (3), in which the stator (5) or the electric motor (4) or the stator-rotor assembly is accommodated or can be placed, and - a separate connecting element (19) which is used, in particular only used, for the form-locking fixing of the stator carrier (18) in the drive housing (2), - in, The connecting element (19) has a body (19a) which at least partially or regionally surrounds the stator support (18), the body having at least one engaging element (26) for a positive connection with the stator support (18), and at least one latching hook (27) for locking the stator (5) in the drive housing (2), and - in, The drive housing (2), in particular in the area of ​​the electronics compartment (35) or in the area between the electronics compartment and the housing channel (3), has a housing contour or engagement contour (37) that cooperates with at least one latching hook (27) of the connecting element (19).

2. The drive device (1, 1') according to claim 1, It is characterized by It has an annular body (19a), on which the at least one latching hook (27) and the at least one engaging element (26) are molded.

3. A drive device (1, 1') according to claim 1 or 2, It is characterized by: The connecting element (19) has a number of axial grooves (30) corresponding to the number of the connecting wires (20), arranged in a receiving grid for receiving connecting wires (20) that are bent in a radial direction, the receiving grid being oriented in a tangential direction and spaced radially apart from the stator support (18).

4. A drive device (1, 1') according to any one of claims 1 to 3, It is characterized by: The stator support (18) has radially raised axial reinforcement ribs (33), and the connecting element (19) has radial grooves (31) corresponding to the axial reinforcement ribs (33) on the stator support side on its main body (19a), and the radial grooves are used for anti-twist locking of the connecting element (19) relative to the stator support (18).

5. A drive device (1, 1') according to any one of claims 1 to 4, It is characterized by: The connecting element (19) has a form-locking element (32), and the housing (2) has a form-locking contour (34) that cooperates with the form-locking element (32) of the connecting element (19), in particular in the area of ​​the electronics compartment (35) or in the area between the electronics compartment and the housing channel (3).

6. A drive device (1, 1') according to any one of claims 1 to 5, It is characterized by: - the connecting element (19) has a pair of latching hooks (27) on the body (19a) that are offset by 180°, or The connecting element (19) has a number of latching hooks (27) which are arranged or provided on the body (19a), in particular at different angular positions, preferably equidistant angular positions.

7. A drive device (1, 1') according to any one of claims 1 to 6, It is characterized by: The housing-side engagement contour (37) of the corresponding latching hook (27) assigned to the connecting element (19) is designed as an undercut, into which the corresponding latching hook (27) engages from behind when the stator (5) is inserted into the drive housing (2) or its housing channel (3).

8. A drive device (1, 1') according to any one of claims 1 to 7, It is characterized by: - the body (19a) of the connecting element (19) has a pair of latching elements comprising engaging elements or latching elements (26) offset by 180°, or - the body (19a) of the connecting element (19) has a number of engaging or latching elements (26) arranged or provided, in particular at different angular positions, preferably equidistant angular positions, and / or - The annular body (19a) of the connecting element (19) has a joint (39), which includes a joint element (26) or a joint element pair arranged at the joint, and when the connecting element (19) is mounted on the stator support (18), the joint element or the joint element pair engages from behind in a radially raised axial reinforcement rib (33) of the stator support (18), wherein when the stator (5) is inserted into the drive housing (2) or its housing channel (3), the engagement from behind is locked by means of a retaining contour (40) on the housing side.

9. Drive device (1, 1') according to claim 8, It is characterized by: The stator bracket (18) has a latching opening (28) corresponding to the engaging element or latching element (26), and when the connecting element (19) is mounted on the stator bracket (18), the engaging element or latching element (26) is embedded in or latched into the latching opening.

10. A drive device (1, 1') according to any one of claims 1 to 9, It is characterized by: The stator carrier (18) has a profile (25) with an insertion groove (24) for the connecting wire (20), wherein the connecting wire (20) is bent in the radial direction.

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