Drive devices with brushless electric motors

Abstract

The present invention relates to a drive device (1) having a transmission housing (2) and an electric motor (3) mounted therein, which is driven by an external actuator. The electric motor is coupled to the transmission and controlled by means of motor electronics (28). The electric motor (3) has a stator (18) and a rotor (20) surrounding the stator (18). The rotor is connected to a drive shaft (16), which is guided through a stator bushing (31). The stator bushing has a first set for retaining the stator bushing (31) in the transmission housing (2) against relative rotation. The first sleeve section (31a) and the second sleeve section (31b) are respectively, and the slot insulator (23) that at least partially surrounds the stator teeth (24) along the axial direction (A) is placed on the second sleeve section, wherein an annular element (34) is placed on the second sleeve section (3b) of the stator bushing (31), the annular element being arranged between the first sleeve section (31a) and the slot insulator (23), and having at least one engaging element (33) that is embedded in the corresponding engaging profile (32) of the first sleeve section (31a) of the stator bushing (31).

Description

Technical Field

[0001] The present invention relates to a drive device for a motor vehicle, particularly an electric adjustment drive, preferably a window lift drive, the drive device having a brushless electric motor implemented by an external actuator. Background Technology

[0002] For example, an electric regulating drive for a motor vehicle, which drives the regulating element between two end positions along the regulating path, typically includes an electric motor and a transmission coupled to the electric motor, the transmission being arranged in a drive housing or a transmission housing. The transmission housing is typically connected to the motor housing via a flange-like connection, wherein the electric motor is typically a brushed internal commutator motor.

[0003] A drive device for a window regulator in a motor vehicle is known from WO 2018 / 06458 A1, wherein a brushless electric motor, implemented as an externally driven motor, and motor electronics for controlling the electric motor are housed in a drive housing or transmission housing. The electric motor has a stator and a rotor configured as an externally driven motor with a rotor shaft (drive shaft). The rotor bears a worm gear driven by a worm wheel (as a 90° deflection drive) with a worm fixed to the relative shaft. The worm wheel drive is coupled to a cable drum, which is used for the cable of the track-guided drive element of the window glass, wound in a plurality of cable loops or cable turns. The stator has a stator body with a plurality of stator teeth arranged in a star shape, these stator teeth being wound with a rotating magnetic field winding. The stator body is mounted on a bushing-shaped support element, which is fixedly connected to the transmission housing and is passed through by a rotor shaft or drive shaft that is anti-rotationally connected to the rotor, for supporting the rotor shaft or drive shaft. The support element has a first pin section with a columnar structure that extends into the stator base and a second pin section with a columnar structure that extends into the transmission housing and is, for example, pressed against the transmission housing, so as to reliably hold the stator in a position on the drive housing or transmission housing via the support element. Summary of the Invention

[0004] The objective of this invention is to provide a particularly suitable drive device of the type mentioned. In particular, the pressing force used to hold the stator in the transmission housing should be as small as possible. Preferably, reliable positioning protection for the stator should be provided, especially with respect to the radial and / or axial position of the stator in the transmission housing.

[0005] According to the present invention, this task is solved by the features of the present invention.

[0006] According to the invention, the drive device, particularly an electric adjustment drive for motor vehicles, preferably a window lift drive, has a brushless electric motor driven by an external actuator. This brushless electric motor is arranged in a drive housing, also referred to below as the transmission housing, and is coupled to a transmission device, particularly in the form of a worm gear transmission. Motor electronics for operating the electric motor are also arranged in the transmission housing.

[0007] The electric motor has a stator with a number of star-shaped stator teeth wound with stator windings. The stator includes a stator body in a suitable manner, preferably implemented as a lamination assembly with a central through-hole. The electric motor also has a rotor surrounding the stator, which has a number of permanent magnets in a can-shaped rotor housing, particularly acting as a magnetic circuit, and is connected to a drive shaft. The stator with stator windings is arranged inside the rotor. The drive shaft is guided through a stator bushing, which in particular serves as a stator support for the wound stator body. The stator bushing has a first bushing section or sleeve section and a second bushing section or sleeve section for resisting relative rotation or preventing rotation in the transmission housing, with a slot insulator placed on the second bushing section or sleeve section.

[0008] An annular element is placed on the second sleeve section of the stator bushing. The annular element is arranged between the first sleeve section and the slot insulator and has at least one engaging element, particularly two engaging elements arranged 180° apart. The corresponding engaging elements are embedded in the corresponding engaging profile of the first sleeve section of the stator bushing, particularly in the form of an axial groove.

[0009] The first sleeve section of the stator bushing is a journal-shaped shaft (Zapfwellenartig) and has fine toothed grooves in a suitable manner. These grooves are used to connect the stator bushing, which carries the stator, and the transmission housing, preferably in a form-locking manner or in a form-locking and force-locking manner, according to the meshing of the fine toothed grooves. For this purpose, the transmission housing has a hollow cylindrical housing section into which the first sleeve section of the stator bushing (preferably without any pressing force or with only the smallest possible pressing force) is inserted.

[0010] The “shape-locking” or “shape-locking connection” between at least two interconnected parts is understood here and hereafter in particular as the interconnected parts being held together in at least one direction by direct interlocking of the contours of the parts themselves or by indirect interlocking via additional connecting parts. Thus, a “prevention” of mutual movement in that direction is achieved by means of the shape.

[0011] The “force-locking” or “force-locking connection” between at least two interconnected parts is understood here and thereafter as the interconnected parts being prevented from sliding against each other based on the frictional force acting between them. If there is no “connecting force” (i.e., the force that presses the parts together, such as a bolt force or gravity itself) that causes this frictional force, then the force-locking connection cannot be maintained and will therefore loosen.

[0012] If the connection between the stator bushing, which supports the stator or its base, and the transmission housing is form-locked and force-locked, then the connection is established by minimizing the deformation of the housing material in the region of the hollow cylindrical section of the transmission housing. Thus, as in a form-locked connection between the stator bushing and the transmission housing, the pressing force is minimized or significantly reduced.

[0013] The slot insulator is suitably formed of two plastic molded parts, each having an annular section and a semi-shell-shaped coil carrier formed on the annular section. The coil carriers extend radially (star-shaped), and the number of coil carriers corresponds to the number of stator teeth. The two slot insulator portions are positioned on the stator base of the stator at two end sides of the stator, such that the semi-shell-shaped coil carriers at least partially overlap or enclose the stator teeth axially, and correspondingly at least partially line the stator slots between the stator teeth in a box-like manner. A rotating magnetic field winding is mounted on the slot insulator, thereby electrically insulating the rotating magnetic field winding from the stator base.

[0014] Here, the slot insulation portion can preferably be uniform, thus enabling manufacturing with simple tools and at particularly low cost. In this variant, the annular element is provided as a separate part, preferably as a plastic injection-molded part. The annular element then has positioning and / or anti-rotation elements on its end side facing the slot insulation portion, opposite to the engaging element, which preferably fits into the engaging groove (axial groove) of the slot insulation portion in a form-locking manner. Alternatively, the annular element can be formed on one of the slot insulation portions, which further simplifies its positioning and retention on the slot insulation portion.

[0015] In an advantageous design, the corresponding engaging element of the annular element extends axially, i.e., extends axially in relation to the motor axis or shaft axis of the electric motor. The engaging profile of the stator bushing corresponding to the respective engaging element also extends axially in a suitable manner, extending into the journal-shaped first sleeve section or bushing section of the stator bushing. In particular, the engaging profile axially penetrates completely through the first sleeve section or bushing section of the stator bushing.

[0016] In an advantageous improvement of the corresponding engagement element, the engagement element has a hook element or clamping element on the free end side, which is embedded in a corresponding locking opening in the hollow cylindrical housing portion or housing section of the transmission housing. Additionally or alternatively, a radially raised locking profile is provided in the engagement profile of the first sleeve section of the stator bushing, the locking profile being engaged from the rear by the engagement element on the annular element side, particularly the preferably wedge-shaped hook element or clamping element on its free end side, in the pre-installed state of the annular element on the stator bushing in the first locking connection or clamping connection, and especially in the engagement state of the stator bushing in the hollow cylindrical housing portion of the transmission housing.

[0017] In the final positioning of the stator within the transmission housing, a second locking connection or clamping connection is preferably established. To achieve simple and reliable stator installation, the radially raised locking profile appropriately has an inclined abutment profile for the engaging elements on the annular element side, particularly for the free end side, preferably wedge-shaped hooks or clamps. Alternatively or additionally, the hollow cylindrical housing portion of the transmission housing has an inlet ramp for the engaging elements on the annular element side, particularly for the free end side, preferably wedge-shaped hooks or clamps, in the region of the entry or insertion opening for the stator bushing and the annular element held thereon in the first locking connection or clamping connection. Thus, the arrangement consisting of the stator bushing and stator base, as well as the annular element and slot insulator, can be inserted into the transmission housing using the already established first locking connection or clamping connection, wherein the engaging elements on the corresponding annular element side are appropriately offset radially inward and radially ejected during final positioning to establish the second locking connection or clamping connection.

[0018] In a suitable design, the annular element has a guide ring with several axially extending and / or several receiving grooves extending at an angle relative to the intermediate axis for accommodating winding sections, stator winding ends, coil joints, or phase joints. The tilt angle or bevel is between 20° and 70°, particularly between 30° and 60°, preferably between 40° and 50°, and especially preferably between 45° and 50°. In this embodiment, the annular element performs a dual function: positioning the stator (radially and axially) and guiding its stator winding ends or coil joints or phase joints.

[0019] The advantages achieved by utilizing the present invention are particularly evident in that by providing the annular element as a separate part or forming element of the stator slot insulation, retention of the stator or positioning in the transmission housing is reliably ensured while avoiding or at least significantly reducing the pressing force.

[0020] Here, reliable positioning protection of the stator in its axial and radial positions within the transmission housing is advantageously achieved, on the one hand, by form-locking or form-locking and force-locking connections between the stator bushing, which serves as a stator carrier and a shaft support and guide for the drive shaft or rotor shaft, and the transmission housing, and by form-locking or material-locking connections between the annular element and the slot insulator of the stator or its stator base.

[0021] The annular element, with its advantageously attached clamping or locking mechanism (first locking connection or clamping connection) to the stator bushing on one hand and to the transmission housing on the other hand (second locking connection or clamping connection), provides particularly secure protection against stator torsion and undesirable longitudinal movement in a simple and reliable manner. Attached Figure Description

[0022] The embodiments of the present invention will then be described in detail with reference to the accompanying drawings. In which:

[0023] Figure 1 The drive unit is shown in perspective, which has a transmission housing (driver housing) and an electric motor housed therein for driving a cable drum, which serves as a driven element of a vehicle window regulator.

[0024] Figure 2 According to Figure 1 The illustration shows the drive unit, in which an electric motor is observed with the (motor) housing cover removed and without cable drums and rotors.

[0025] Figure 3 An exploded view shows a drive unit with an electric motor in a pre-installed position before being inserted into the drive housing, wherein the (electronics) housing cover is removed and the drive unit is positioned towards the drive unit. Figure 1 View the transmission housing from the opposite housing side;

[0026] Figure 4 An exploded view shows a stator bushing (stator support) serving as a carrier of the stator base, having a shaft-shaped sleeve section with an axial groove as a engagement profile, and an annular element having two engagement elements implemented with locking hooks or clamps.

[0027] Figure 5 An exploded view shows a stator bushing with placed annular elements and a slot insulation member having two identical (consistent) slot insulation portions for stator or stator base stator windings or rotating magnetic field windings.

[0028] Figure 6 Shown in perspective Figure 5The arrangement shown consists of a stator bushing, an annular element, and a two-piece slot insulator (a variant of the two-piece arrangement consisting of a slot insulator and an annular element).

[0029] Figure 7 A variant is shown in perspective, which has an annular element formed on a slot insulation portion (a one-piece variant consisting of the slot insulation portion and the annular element).

[0030] Figure 8 According to Figure 3 The illustration shows a drive device having an electric motor in a transmission housing without motor electronics, and a locking recess (opening) of a locking part (clamping part) of an annular element inside the transmission housing is observed.

[0031] Figure 9 Along Figure 8 The cross-sectional view along centerline IX-IX shows the locking part (clamping part) of the annular element when the locking hook or clamp of the engaging element of the annular element is loose.

[0032] Figure 10 The area of ​​the insertion opening in the transmission housing is shown in cross section. The insertion opening has an inlet ramp and an outlet ramp at the radially raised locking profile in the engagement profile (engagement groove, axial groove) of the stator bushing as an inclined abutment profile for the corresponding engagement element of the annular element.

[0033] Figure 11 According to Figure 10 The illustration shows an arrangement of one of the engaging elements, with an annular element in a certain position, during the process of moving or inserting the stator into the transmission housing.

[0034] Figure 12 Along Figure 8 The cross-sectional view of line Xll-Xll shows the arrangement of the stator (of the equipment) in the final installation positioning.

[0035] In all the accompanying drawings, corresponding parts are given the same reference numerals. Detailed Implementation

[0036] Figure 1 and Figure 2An electric drive device 1 with a transmission housing or drive housing 2 is shown in perspective, into which an electric motor 3, implemented by an external actuator, is housed. For this purpose, the transmission housing 2 has a housing opening (insertion opening) 4 through which the electric motor 3 can be inserted or inserted. The electric motor 3 drives a driven element 5 via an (invisible) transmission mechanism; in this embodiment, the driven element is a cable drum for a window regulator cable in a motor vehicle. A connector 6, having a current and voltage supply for the drive device 1 used as an adjustment drive in a motor vehicle and a connection line 7 for inputting and / or outputting control or sensor signals, is inserted into a connector receiving portion 8 on the housing side.

[0037] The transmission mechanism of the drive device 1 is a 90° deflection transmission, particularly a worm gear transmission, in which the worm gear drives the driven element 5 via a drive journal or shaft journal 9. The ventilation opening 10 on the housing side is covered by a membrane 11 that is impermeable to air and / or liquid. Two connecting domes 12 for fastening (screw fastening) the housing cover 13 are located on either side of the housing opening 4. For this purpose, the housing cover 13 is fastened to the drive housing 2 by means of screws 14 housed in the connecting domes 12, and therein in the area of ​​the housing opening 4. The shaft journal 15 of the drive shaft (rotor shaft or motor shaft) 16 is also supported, for example, in the housing cover 13 on a support point 17, or simply placed there.

[0038] observe Figure 3 The electric motor 3 also has a stator 18 and a rotor 20 formed by permanent magnets 19. The stator 18 carries a stator winding or rotating magnetic field winding 21, hereinafter simply referred to as the winding. The winding 21 is mounted on a slot insulator 23, which surrounds... Figure 12 The stator base 18a, visible in the middle portion, has stator teeth 24 arranged in a star pattern. In this embodiment, the stator 18 has nine (9) stator teeth 24. Figure 3 Only one stator tooth, 24, is marked in the middle.

[0039] The permanent magnet 19 of the rotor 20 is arranged sideways on the inner wall within a can-shaped housing (rotor housing) 25. The housing 25 is connected to the drive shaft 16, for example, via a shaft journal, to resist relative rotation, and thus rotates within the housing 2 or housing cover 13 about the stator 18 of the brushless electric motor 3, which is implemented as an external actuator motor and is fixed in the transmission housing 2. The rotor shaft 16 carries a worm (not shown), which, in the installed state, meshes with an invisible worm wheel of the transmission. A magnetic signal transmitter (pole wheel) can be placed on the rotor shaft 16, which works non-contactly with a magnetic sensor, such as a Hall sensor, to determine or obtain the rotational speed and direction of rotation of the drive shaft 16.

[0040] Inside the drive housing 2 is a printed circuit board 27 equipped with electronic and / or electrical structural elements 26 for the motor electronics 28. The internal space 2b of the transmission housing 2 is accessible via a housing opening 2a, which is closed immediately after the transmission and the motor electronics 28, including the printed circuit board 27, are installed by means of a housing cover (not shown). Immediately after the printed circuit board 27 is installed, the electric motor 3 is moved, inserted, or inserted into the transmission housing 2 via the housing opening 4. The printed circuit board 27 (refer to the axial direction A and radial direction R shown) is mounted radially spaced from the drive shaft (motor shaft) 16 in the drive housing 2.

[0041] During the process of introducing the electric motor 3 into the transmission housing 2, the phase connectors or coil connectors 29 of the windings (rotating magnetic field windings or stator windings) 21 of the electric motor 3 are inserted or spliced ​​with the connector receiving portion 30 of the printed circuit board 27 inside the transmission housing 2. For this purpose, the coil connectors or phase connectors 29 are brought into a radially oriented engagement position.

[0042] As follows Figures 4 to 6 As detailed above, the stator 18 is held in a prescribed position by its stator base 18, which is enclosed by the slot insulator 23, and the windings 21 mounted on the stator bushing or stator sleeve 31, which serves as a support (stator support). Here, anti-torsion protection against torsion in the circumferential direction U and axial anti-movement protection in the axial direction A are established. For this purpose, the stator bushing 31 has an axial groove in the first sleeve section or bushing section 31a as a (corresponding) engagement profile 32, in which the engagement element 33 of the annular element 34 is placed. This engagement element is further configured to guide the coil connector or phase connector 29 into its radial engagement position.

[0043] Figure 4 The diagram shows a stator bushing 31, a first sleeve section 31a with a journal and an axial groove as a engagement profile 32, serving as a support member (stator carrier) for the stator base 18a in pre-installation positioning, and an annular element 34 with two engagement elements 33 implemented as locking hooks or clamps. The first sleeve section 31a with a journal has a fine toothed groove 31c on its outer peripheral side. This fine toothed groove allows the electric motor 3 to be positioned within the hollow cylindrical housing section 2c when the electric motor 3 is inserted into the transmission housing 2. Figure 9 and Figure 12 A fixed fit is established between the stator bushing 32 and the transmission housing 2 by means of a form-locking or form-locking and force-locking connection. An axial groove provided in the first sleeve section or bushing section 31a of the stator bushing 31 advantageously has a radially raised locking profile 32a as the (corresponding) engagement profile 32. Figures 10 to 12 Instead of the fine toothed groove 31c, a flattening portion on one or both sides may also be provided on the sleeve section 31a.

[0044] Also in the electric motor 3 and the transmission device housing 2 Figure 12 In the final installation state shown, the drive shaft 16, which is anti-rotationally connected to the rotor 20, is guided via the stator bushing 31 and for this purpose through the support opening 35 at its center.

[0045] On the stator bushing 31, the annular element 34 is... Figure 5 In the installation state shown, when the annular element 34 is pushed onto the stator bushing 31 along the second sleeve section or bushing section 31b of the stator bushing 31 according to the double arrow of the dotted line (not detailed), and a first locking connection or clamping connection 36a is established, the engaging element 33 on the annular element side engages from the rear with a wedge-shaped hook element or clamping element 33a provided on the free end side, which in turn engages the radially raised locking profile 32a on the stator bushing side. Thus, the annular element 34 is secured (radially and axially) in its prescribed positioning on the stator bushing 31 to prevent torsion and longitudinal movement.

[0046] Such as combining Figure 6 As can be seen, the stator bushing 31 also serves as a carrier (stator carrier) for the slot insulator 23. The slot insulator 23 has an annular section 37 that surrounds the stator bushing 31 in the region of the second sleeve section 31b of the stator bushing, and a number of semi-shell-shaped, radially extending coil carriers 38 corresponding to the number of stator teeth 24 are formed on the annular section. The coil carriers at least partially overlap or surround the stator teeth 24 in the axial direction A, and box-line the stator slots (not shown in detail) formed between the stator teeth 24.

[0047] exist Figure 5 and Figure 6In the illustrated embodiment (a two-piece variant consisting of slot insulation portion 23 and annular element 34), slot insulation portion 23 has two identical, preferably identical, slot insulation portions 23a and 23b. These slot insulation portions further have engagement grooves or axial grooves 39 in the annular section 37. Hook-shaped or journal-shaped positioning elements and / or anti-rotation elements 40 (shape-locking) provided on the end side of the annular element 34 facing slot insulation portion 23 are embedded in the engagement grooves or axial grooves. Thus, the corresponding slot insulation portion 23a is secured to the stator bushing 31 by means of the annular element 34 to prevent torsion and is arranged (supported) in a prescribed position. Because stator teeth 24 (not shown) are accommodated in the slot insulation portions 23a and 23b of the stator base 18a of the stator 18 and in the tooth cavity 41 formed by the coil carrier 38, and are provided with windings 21, the stator 18, having an arrangement structure consisting of slot insulation 23, stator base 18a and windings 21, is generally torsion-resistant and axially fixed in the axial direction A in a reliable positioning manner on the stator bushing.

[0048] The slot insulator 23 and, in particular, its coil carrier 38, are used to electrically insulate the coil wound onto the stator teeth 24 when the slot insulator 23 is in the middle. The coils are electrically connected to each other or in a connected state in a star or delta circuit of the stator winding 21 by means of motor electronics to form a rotating magnetic field. In this variant, it is advantageous for simple and cost-effective manufacturing (production) that the consistent slot insulator portions 23a, 23b (as in...) Figure 6 They are placed on the stator bushing 31 in a twisted or mirror-reversed manner (as can be clearly seen in the image) and reversed.

[0049] Figure 7 A variant is shown in perspective, having an annular element 34 formed on one of the slot insulation portions 23a, 23b (a one-piece variant consisting of slot insulation portion 23a and an annular element 34). Here, the arrangement of the slot insulation portion 23a and the annular element 34 can be implemented as a two-component plastic part (two-component one-piece). This is advantageous for thermal bonding of the phase connectors or coil connectors 29 located in the recesses or grooves 42 of the annular element 34. The recesses or grooves 42 are introduced into a one-piece (integral) guide ring 43 with the annular element 34, some of which are axially oriented, while others are oriented at an angle preferably (45±5)°.

[0050] Figure 8 With similar Figure 3The illustration shows the drive device 1 with the printed circuit board 27 removed from the transmission housing 2 and without the motor electronics 28. The drive device has an electric motor 3 that is inserted into the transmission housing 2 via the housing opening or the insertion opening 4 and is in its final position. The locking recess (locking opening) 44 of the locking part (clamping part) of the annular element 34 inside the transmission housing 2 is observed. Figure 9 Along Figure 8 The cross-sectional view along centerline IX-IX shows this installation configuration.

[0051] As in Figure 9 and Figure 12 As can be clearly seen in the image, the engaging elements 33 of the annular element 34, which are arranged 180° apart from each other, are locked (clamped) in corresponding, opposite locking recesses (locking openings) 44 by means of the locking hooks or clamps (hook elements or clamping elements) 33a on their free end sides.

[0052] Figure 10 The cross-sectional view shows the opening area of ​​the insertion opening 45 of the hollow cylindrical housing section 2c of the transmission housing 2. The insertion opening has an inlet ramp 46 and an inclined abutment profile 47 that is radially inwardly skewed toward the center line M of the motor axis or shaft axis or drive shaft corresponding to the electric motor 3. This abutment profile serves as an outlet ramp in the axial groove of the engagement profile 32 of the stator bushing 31 of the corresponding engagement element 33 of the annular element 34, to provide anti-torsion protection for the annular element.

[0053] The stator bushing side abutment profile 47 is dimensioned such that the wedge-shaped hook element 33a of the corresponding engagement element 33 and the inlet ramp 46 on the housing side are according to Figure 11 The dashed lines L1 and L2 shown are oriented parallel to each other. Thus, it is possible or ensured that the stator bushing 31, carrying the annular element 34 engaged in the first locking connection or clamping connection 36a, can be inserted via the insertion opening 45 into the hollow cylindrical housing section 2c of the transmission housing 2. Here, for example, based on the corresponding clearance between the engaging element 33, especially its wedge-shaped hook element 33a, and the groove bottom of the engaging profile 32, the engaging element 33 can be offset radially inward toward the direction of the intermediate axis (shaft axis) M shown by the dashed line on the free end side or its hook element 33a.

[0054] exist Figure 12In the final positioning shown, the stator 18 and its arrangement consisting of the stator bushing 31, the annular element 34, the stator base 18a, the slot insulator 23, and the winding 21 are form-locked in the second locking connection or clamping connection 36b within the transmission housing 2, and are reliably fixed in a specified radial and axial position. Here, the engaging element 33 on the corresponding annular element side ejects radially into the locking recess 44 on the corresponding housing side to establish the second locking connection or clamping connection 36b.

[0055] The fine-toothed groove 31c on the first sleeve section or bushing section 31a of the stator bushing 31 is used to reliably hold the stator 18 in the transmission housing 2. Here, the fine-toothed groove engagement between the stator bushing 31 and the hollow cylindrical housing section 2c of the transmission housing 2 can be established by form-locking alone or by both form-locking and force-locking, in a way that the fine-toothed groove 31c displaces as little wall material as possible in the region of the hollow cylindrical housing section 2c within the range of the pressing process with the smallest possible pressing force.

[0056] In summary, the drive device 1 has a transmission housing 2 and a brushless electric motor 3 implemented by an external actuator mounted in the transmission housing. The electric motor is coupled to or can be coupled to the transmission and is controlled by means of motor electronics 28. The electric motor 3 has a stator 18 and a rotor 20 surrounding the stator. The rotor is connected to a drive shaft 16, which is guided through a stator bushing 32. The stator bushing has a first sleeve section 31a and a second sleeve section 31b for retaining the stator bushing 31 in the transmission housing 2 against relative rotation. A slot insulator 23, which at least partially surrounds the stator teeth 24 in the axial direction A, is placed on the second sleeve section. An annular element 34 is placed on the second sleeve section 31b of the stator bushing 31. The annular element is arranged between the first sleeve section 31a and the slot insulator 23 and has at least one engaging element (33) that is embedded in a corresponding engaging profile 32 of the stator bushing 31.

[0057] The claimed invention is not limited to the embodiments described above. Rather, other variations of the invention can be derived by those skilled in the art within the scope of the disclosed claims without departing from the subject matter of the claimed invention. In particular, all the individual features described in conjunction with different embodiments can also be combined in other ways within the scope of the disclosed claims without departing from the subject matter of the claimed invention.

[0058] Furthermore, the described solution can be used not only in the application scenarios specifically shown, but also in other motor vehicle applications in similar implementations, such as door and tailgate systems, window regulators, vehicle locks, adjustable seats and interior space systems, as well as electric actuators, control units, sensors and their systems in the vehicle.

[0059] List of reference numerals

[0060] 1. Drive device

[0061] 2. Transmission / Driver Housing

[0062] 2a Shell opening

[0063] 2b Interior space

[0064] 2c Shell section

[0065] 3 Electric motors

[0066] 4. Housing opening / removal opening

[0067] 5 Driven elements

[0068] 6 Connecting plug

[0069] 7. Connection lines

[0070] 8. Connector Receiving Section

[0071] 9 Drive journal / shaft journal

[0072] 10 Ventilation openings

[0073] 11 Membrane

[0074] 12 Connecting vaults

[0075] 13. Housing cover

[0076] 14 Screws

[0077] 15-axis journal

[0078] 16 Drive shaft / motor shaft / rotor shaft

[0079] 17 Support points

[0080] 18 stators

[0081] 18a stator matrix

[0082] 19 permanent magnet

[0083] 20 rotors

[0084] 21 Stator winding / Rotating magnetic field winding / Winding

[0085] 23. Slot insulation components

[0086] 24 stator teeth

[0087] 25 Rotor housing / casing

[0088] 26 Structural Components

[0089] 27 Printed Circuit Boards

[0090] 28 Motor Electronic Components

[0091] 29-phase connector / coil connector

[0092] 30 Connector Receiving Section

[0093] 31 Stator bushing / sleeve

[0094] 31a First sleeve section / bushing section

[0095] 31b Second sleeve section / bushplate section

[0096] 31c Fine tooth groove

[0097] 32. Joint profile / axial groove

[0098] 32a Lock Outline

[0099] 33 Connecting elements

[0100] 33a Hook element / clamp element

[0101] 34 Ring elements

[0102] 35 Support opening

[0103] 36a First locking connection / clamping connection

[0104] 36b Second locking connection / clamping connection

[0105] 37. Circular section

[0106] 38 Coil carrier

[0107] 39 Joint groove / axial groove

[0108] 40 Positioning element / Anti-rotation element

[0109] 41 Tooth cavity

[0110] 42 recess (groove)

[0111] 43 Guide ring

[0112] 44 Locking recess / opening

[0113] 45 Insert opening

[0114] 46 entrance slope

[0115] 47. Fit to outline

[0116] Axial direction

[0117] M centerline / motor axis / shaft axis

[0118] R radial direction

[0119] U surrounding directions

Claims

1. A drive device (1) having a transmission housing (2) and an electric motor (3) mounted in the transmission housing and driven by an external actuator, the electric motor being coupled to or capable of being coupled to the transmission and controlled by means of motor electronics (28). - in, The electric motor (3) has a stator (18) with a plurality of star-shaped stator teeth (24) wound with stator windings (21). - Wherein, the electric motor (3) has a rotor (20) surrounding the stator (18), the rotor being connected to a drive shaft (16) guided through a stator bushing (31), the stator bushing having a first sleeve section (31a) and a second sleeve section (31b) with journals for retaining the stator bushing (31) in a hollow cylindrical housing section (2c) of the transmission housing (2) against relative rotation, and a slotted insulating member (23) at least partially surrounding the stator teeth (24) along the axial direction (A) is placed on the second sleeve section, and - Wherein, an annular element (34) is placed on the second sleeve section (31b) of the stator bushing (31), the annular element being arranged between the first sleeve section (31a) and the slot insulator (23), and having at least one engaging element (33) that is embedded in the corresponding engaging profile (32) of the first sleeve section (31a) of the stator bushing (31).

2. The driving device (1) according to claim 1, characterized in that, The first sleeve section (31a) of the stator bushing (31) with a journal carries a fine toothed groove (31c) for form-locking connection or form-locking and force-locking connection with the hollow cylindrical housing section (2c) of the transmission housing (2).

3. The driving device (1) according to claim 1 or 2, characterized in that, - The corresponding coupling element (33) extends axially, and / or - The engagement profile (32) corresponding to the corresponding engagement element (33) extends axially into the first sleeve section (31a) of the stator bushing (31) with a journal.

4. The driving device (1) according to any one of claims 1 to 2, characterized in that, The corresponding engagement element (33) has a hook element or clamping element (33a) on the free end side, which is embedded in the corresponding locking opening (44) of the hollow cylindrical housing section (2c) of the transmission housing (2).

5. The driving device (1) according to any one of claims 1 to 2, characterized in that, A radially raised locking profile (32a) is provided in the engagement profile (32) of the first sleeve section (31a) of the stator bushing (31), which is counter-locked by the engagement element (33) on the annular element side in the engagement state of the stator bushing (31) in the hollow cylindrical housing section (2c) of the transmission housing (2).

6. The driving device (1) according to claim 5, characterized in that, The radially raised locking profile (32a) has an inclined abutment profile (47) for the engagement element (33) on the annular element side.

7. The driving device (1) according to any one of claims 1 to 2, characterized in that, The hollow cylindrical housing section (2c) of the transmission housing (2) has an inlet ramp (46) for the engagement element (33) on the annular element side in the region of the insertion opening (45) for the stator bushing (31).

8. The drive device (1) according to any one of claims 1 to 2, characterized in that, The slot insulating member (23) has first and second slot insulating portions (23a, 23b), the first and second slot insulating portions having annular sections (37) surrounding the stator bushing (31) in the region of the second sleeve section (31b) of the stator bushing, and a number of semi-shell-shaped, radially extending coil carriers (38) corresponding to the number of stator teeth (24) are formed on the annular sections.

9. The driving device (1) according to any one of claims 1 to 2, characterized in that, - The annular element (34) is formed onto the slot insulator (23), or - The annular element (34) has a positioning element and / or an anti-rotation element (40) on the end side facing the slot insulator (23), the positioning element and / or anti-rotation element being embedded in the engagement groove (39) of the slot insulator (23).

10. The drive device (1) according to any one of claims 1 to 2, characterized in that, The annular element (34) has a guide ring (43) having a plurality of axially extending and / or a plurality of receiving slots (42) extending at an angle (β) relative to the intermediate axis (M) for receiving winding sections, coil joints or phase joints (29) of the stator winding (21), the angle being between 20° and 70°.

11. The drive device (1) according to any one of claims 1 to 2, characterized in that, The drive device (1) is a motor vehicle window lift driver.

12. The drive device (1) according to any one of claims 1 to 2, characterized in that, The annular element has two interlocking elements (33) arranged 180° apart.

13. The driving device (1) according to claim 8, characterized in that, The annular element (34) is formed onto one of the slot insulating portions (23a, 23b).

14. The driving device (1) according to claim 10, characterized in that, The angle is between 30° and 60°.

15. The driving device (1) according to claim 10, characterized in that, The angle is between 40° and 50°.

16. The driving device (1) according to claim 10, characterized in that, The angle is between 45° and 50°.

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