DE102021212840A1 - Driving device with a brushless electric motor - Google Patents

Abstract

The invention relates to a drive device (1), having a brushless electric motor (4) with a rotating field or stator winding (14) and a bush-shaped (16) having stator (13) and with a rotor (15) revolving around this with a through the rotor shaft (12) guided by the stator support (16) and with a gear housing (2) with an electronics compartment (2b) and with a housing shaft (2a) into which the electric motor (4) or the stator-rotor assembly can be accommodated or inserted and with a separate connecting element (24) for positively locking the stator carrier (16) in the transmission housing (2), the connecting element (24) having a connecting leg (24a) with a joining element (25) formed thereon for positively locking connection with the stator carrier (16) and has at least one latching leg (24b) for positive connection with the gear housing (2), and wherein the gear housing (2), in particular in the area of the electronics compartment (2b) or in the area between this and the housing shaft (2a), has a connection element ( 24) has a cooperating latching contour (27, 29, 30) and the stator support (16) has a joining contour (28, 35) cooperating with the connecting element (24).

Description

The invention relates to a drive device, in particular an electromotive adjusting drive, preferably a window lifter drive, of a motor vehicle, with a brushless electric motor of external rotor design.

A drive device, which drives an actuating element between two end positions along an adjustment path, for example as an electromotive adjustment drive of a motor vehicle, usually includes an electric motor and a gear mechanism coupled thereto, which is arranged in a gear housing. The transmission housing is connected to a motor housing accommodating the stator and the rotor of the electric motor, for example via a flange-like connection, with the electric motor being able to be a brushed (internal rotor) commutator motor or a brushless external rotor motor. In the case of a brushless electric motor, the stator has a rotary field winding (stator winding) and a permanently excited rotor with a rotor shaft which is coupled to the transmission or can be coupled to it. Such drive devices are typically used as window lift drives.

From the DE 10 2016 216 888 A1 a drive device for a window regulator of a motor vehicle is known, in which a brushless electric motor designed as an external rotor motor and motor electronics for controlling it are accommodated in a drive or gear housing. The brushless (electrically or electronically commutated) electric motor has a stator and a rotor designed as an external rotor with a rotor shaft (drive shaft) which carries a worm of a worm gear fixed to the shaft as a 90° deflection gear. The worm gear is coupled to a cable drum, which is wrapped by a traction cable of a rail-guided driver for a window pane with several cable windings or cable windings. The stator has a stator base body with a number of star-shaped stator teeth, which are wound with a rotary field winding. The basic stator body is seated on a bush-shaped or hollow-cylindrical stator carrier, which is connected to the transmission housing and penetrated by the rotor or drive shaft, which is connected non-rotatably to the rotor. 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 bush-shaped stator support.

The stator carrier fulfills several functions in the drive device, in particular connecting and establishing a connection between the stator and the transmission housing, establishing a rigid connection with the stator base body, preferably designed as a stator laminated core, supporting the (rotor) shaft, in particular by means of a (Radial or sliding) bearing arranged in the bush-shaped or bush-like stator base body, and/or ensuring good concentricity of the rotor to the stator. The hollow-cylindrical stator carrier can be designed as a sintered component or as a formed or machined metal part (e.g. by cold extrusion, drawing or turning) and an additionally mounted bearing bush. Since press fits are typically provided at the interfaces to the adjacent components, there is a large spread in the required assembly forces due to typically high component tolerances. Furthermore, the durability of the press connections is often not guaranteed.

The invention is based on the object of specifying a particularly suitable drive device, in particular a suitable window lifter drive. In particular, there should be a secure connection between the (hollow-cylindrical or bush-like) stator carrier and the transmission housing (drive housing) or a loosening of this connection due to operational loads should be avoided.

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

The drive device according to the invention, in particular a window lifter drive as an electromotive adjustment drive of a motor vehicle, has a drive housing with a brushless electric motor mounted or mountable therein. The preferably electronically commutated electric motor has a stator with or for a rotary field winding (stator winding) and a preferably permanently excited rotor with a rotor shaft which is coupled to a gear or can be coupled to it.

The stator of the electric motor preferably has a stator base body, in particular in the form of a laminated stator core made of stamped laminations, with a number of stator teeth arranged in a star shape, which are or will be wound with the stator winding. The stator or its basic stator body has a central passage (through-opening) and a tubular component, also referred to below as a stator bushing or (hollow-cylindrical) stator carrier, which is suitably inserted, preferably pressed, into the passage of the stator basic body and serves as a shaft passage for the rotor wave serves. The stator carrier, which is preferably designed as a sintered component, is also useful for accommodating a bearing, in particular a radial or plain bearing, for the rotor shaft. The stator carrier can also be designed as a turned or (cold) formed component or as a plastic component.

In this advantageous embodiment of the electric motor, the rotor is an external rotor with a rotor housing surrounding the stator base body and coupled to the rotor shaft, with permanent magnets arranged therein. The electric motor is therefore an external rotor design. Suitably, slot box insulation, preferably made of two shell-shaped or half-shell-shaped insulating caps, is placed on the stator support. The slot box insulation is used for electrical insulation of the rotating field or stator winding wound on the stator teeth. The rotating field winding on the stator side can be formed from a number of single or double or multiple coils whose coil ends are connected to one another, for example in a star or delta connection. The ends of the coil form the phase connections as connecting wires, via which the (phase-shifted or phase-accurate) current flow of the stator winding takes place.

The electric motor and the transmission are advantageously each arranged in a housing, namely in a motor housing and in a transmission housing, which form or represent the drive housing. The transmission housing and the motor housing are connected to one another to form the drive housing, preferably detachably, in particular by means of a flange connection. The connection (connection point) between the transmission housing and the motor housing, which can also be designed as a non-detachable connection, for example as a welded connection, is referred to below as the connection interface.

The transmission housing of the drive device has an electronics compartment and a housing shaft which is coaxial with the axis of rotation (shaft axis) of the rotor shaft. A printed circuit board with connection points for the phase connecting wires is accommodated or used in the electronics compartment. The electric motor or the stator-rotor assembly with the rotor shaft and the stator carrier is accommodated or inserted in the preferably hollow-cylindrical housing shaft. For this purpose, the gear housing has a housing opening which opens into the housing shaft and through which the assembly of rotor and rotor shaft and stator with stator support and stator or rotary field winding is inserted or pushed into the gear housing. In this case, the rotor or motor shaft advantageously already carries a worm which, in the assembled state, meshes with a worm wheel of a 90° deflection gear (worm gear) rotatably mounted in the gear housing.

In summary, the drive device has a brushless electric motor with a stator, which has a rotating field or stator winding with a number of phase connecting wires and a bush-shaped or hollow-cylindrical stator carrier, also referred to below as the stator bush. The electric motor also has a rotor which rotates around the stator and has a rotor shaft which is coupled to it and which is guided through the hollow-cylindrical stator carrier.

The drive device also has a gear housing with an electronics compartment for accommodating a circuit board for motor electronics and with a housing shaft, in particular coaxial to the axis of rotation of the rotor shaft, via which or in which the electric motor with the stator including the stator carrier and the rotor with the rotor shaft is accommodated or is recorded.

The drive device also has a separate connecting element for, in particular exclusively, positively locking the stator carrier in the transmission housing. In other words, the connecting element is provided as a separate component. This is preferably mounted in the transmission housing, preferably latched into it or latched (clipped) thereto, before the stator carrier or the stator-rotor assembly or the electric motor is pushed into the transmission housing via the housing shaft.

The connecting element suitably has a connecting leg with a joining element formed thereon for a form-fitting connection to the stator carrier and at least one latching leg for a form-fitting connection to the transmission housing. Particularly preferably, the connecting element is approximately U-shaped with U-legs designed as latching legs, on which latching hooks are provided on the free-end or leg-end side. These are expediently facing one another and—in relation to the housing shaft and/or to the hollow-cylindrical stator carrier in the circumferential direction or azimuthally—spaced apart from one another.

The latching hooks can also face away from one another, that is to say they can be directed outwards, for example. In addition, the latching legs can be oriented radially. In this variant, the latching hooks also serve as joining elements for the positive connection with the stator carrier, which preferably has corresponding radial grooves or beads for this purpose. In other words, the latching legs or their latching hooks are used for the connecting element tes this variant both for positive connection with the stator as well as with the transmission housing.

The gear housing has, in particular in the area of the electronics compartment or in the area between this and the housing shaft (in the transition area between the housing shaft and the electronics compartment of the transmission housing), a latching contour which interacts with the connecting element. Analogously, the stator carrier has a joining contour that interacts with the connecting element.

In an advantageous embodiment, the latching contour on the housing has at least one axially extending insertion channel for receiving the latching leg and a gripping contour for latching the respective latching leg of the connecting element.

According to a suitable variant, the joining element formed onto the connecting leg of the connecting element is designed as a spring-elastic latching arm with a latching element. In this variant, the stator support suitably has a locking opening corresponding to the locking element of the connecting element as a joining element or joining contour, into which the locking element locks when the stator support is pushed into the transmission housing.

According to a further suitable variant, the joining element formed onto the connecting leg of the connecting element is designed as a fork-like pair of latching arms. In other words, this joining element is made up of two radially oriented latching arms which are spaced apart from one another in the circumferential direction or azimuthally in relation to the housing shaft and/or the hollow-cylindrical stator carrier and which can yield resiliently, preferably outwards.

In this variant, the stator carrier suitably has a radially raised strut (axial strut) as a joining element or joining contour, which extends over an axially limited longitudinal section along the stator carrier. The axial strut is overlapped on both sides by the pair of latching arms as the stator carrier is pushed into the transmission housing, with the two latching arms yielding resiliently in opposite directions. In the pushed-in state of the stator carrier and in the course of the latching of the connecting element, the latching arms engage behind the axial strut or the end of the strut facing the housing or shaft opening of the housing shaft. Two parallel axial struts can also be provided on the stator carrier, B. U-shaped, enclose or overlap.

According to an expedient development, the connecting leg of the connecting element has a number of axial grooves corresponding to the number of phase connection wires for receiving the phase connection wires, in particular those that are already bent radially. The axial grooves are preferably arranged in a connection pattern or connection grid which is in particular tangentially oriented and—in the assembled state of the stator support or the stator-rotor assembly—is arranged at a radial distance from the stator support.

The stator preferably has slot box insulation that at least partially covers or overlaps the stator teeth in the axial direction, with a collar-like cap section that encompasses the stator carrier. The slot box insulation is expediently placed on the stator support with its collar-like cap section. In particular, the cap section has a contour, preferably radially raised, with insertion grooves for the phase connection wires. In the assembled state of the stator-rotor assembly with the stator, including the stator carrier and with the slot box insulation that may be provided, with the rotating field or stator winding arranged on it, as well as with the rotor and the rotor shaft, the phase connection wires are accommodated in the insertion slots of the contour of the cap section and in the axial slots of the connecting element and thus reliably or fail-safely aligned for contacting with the printed circuit board accommodated in the electronics compartment of the transmission housing.

The phase connection wires are particularly expediently bent radially in the insertion grooves of the contour of the cap section of the slot box insulation. In this pre-assembly state, the electric motor or the stator-rotor assembly is inserted into the housing shaft, with the phase connection wires being or being received in the axial grooves of the connecting element. The axial grooves of the connecting element extend in the axial direction and are open towards the housing shaft or its shaft opening, so that the phase connection wires, which are expediently already bent radially, can be securely inserted into these receiving or axial grooves when the electric motor or the stator-rotor assembly is inserted into the housing shaft are included or are included in the assembled state.

The advantages achieved by the invention are, in particular, that by means of the separate connecting element during assembly of the stator or the stator-rotor assembly in the gearbox begehäuse latched, the stator carrier and thus the stator is secured against axial (out) sliding out of the transmission housing and against twisting. The reliable mounting or fixing of the stator or the stator-rotor assembly in the transmission housing is, preferably exclusively, produced by a form-fitting connection which, in comparison to a press fit, has greater component tolerances without the risk of the rigid connection of the stator or stator becoming undesirably loosened -Rotor assembly in or with the gearbox housing.

A "positive fit" or a "positive connection" between at least two parts connected to one another is understood here and in the following in particular to mean that the parts connected to one another are held together at least in one direction by a direct interlocking of contours of the parts themselves or by an indirect interlocking via an additional connector. The "blocking" of a mutual movement in this direction is therefore due to the shape.

By integrating the axial grooves in the connecting element, the phase connection wires are aligned reliably and almost automatically in the desired position. This enables an automated assembly process, in particular also the insertion of the motor electronics circuit board in the electronics compartment of the transmission housing, in that the reliably aligned phase connecting wires for contacting them on the circuit board side slide reliably and reliably into corresponding circuit board openings or are accommodated in them.

• 1 in perspektivischer Darstellung eine Antriebsvorrichtung mit einem Antriebs- oder Getriebegehäuse und darin aufgenommenem Elektromotor in Außenläuferausführung zum Antrieb einer Seiltrommel als Abtriebselement einer Verstelleinrichtung, insbesondere eines (Seil-)Fensterhebers, eines Kraftfahrzeugs,
• 2 in einer Schnittdarstellung die Antriebsvorrichtung mit einer ersten Variante des Verbindungselementes zur formschlüssigen Fixierung eines Statorträgers einer Stator-Rotor-Baugruppe des Elektromotors im Getriebegehäuse,
• 3 in einer perspektivischen Darstellung das Verbindungselement gemäß 1,
• 4 in einer perspektivischen Darstellung das Getriebegehäuse mit in einem Übergangsbereich zwischen einem Gehäuseschacht zum Einführen der Stator-Rotor- Baugruppe des Elektromotors und einem Elektronikfach für eine Leiterplatte einer Motorelektronik gehäusefest verrastetem Verbindungselement gemäß 3,
• 5 in einer Schnittdarstellung das Getriebegehäuse mit verrastetem Verbindungselement mit angeformten Rastschenkeln (Rastarmen) und mit in den Gehäuseschacht ragendem Füge- oder Rastelement,
• 6 in einer perspektivischen Darstellung eine zweite Variante des Verbindungselements,
• 7 in einer perspektivischen Darstellung die zweite Variante des Verbindungselements in einer Fügeverbindung mit dem Statorträger,
• 8 ausschnittsweise in einer Seitenansicht mit Blick in den Gehäuseschacht des Getriebegehäuses das darin eingesetzte Verbindungselement gemäß 7,
• 9 in einer Schnittdarstellung die Antriebsvorrichtung mit der zweiten Variante des Verbindungselementes zur formschlüssigen Fixierung des Statorträgers der Stator-Rotor-Einheit im Getriebegehäuse,
• 10 in einer perspektivischen Darstellung eine dritte Variante des Verbindungselements,
• 11 in einer perspektivischen Darstellung die Stator-Rotor- Baugruppe des Elektromotors mit einer Radialnut bzw. Sicke als Fügekontur im Statorträger,
• 12 in einer Darstellung gemäß 11 die Stator-Rotor- Baugruppe mit auf den Statorträger (formschlüssig) aufgesetztem Verbindungselement gemäß 10,
• 13 ausschnittsweise in einer Seitenansicht mit Blick in den Gehäuseschacht des Getriebegehäuses das darin eingesetzte Verbindungselement gemäß 10, und
• 14 in einer Schnittdarstellung die formschlüssige Verbindung des Verbindungselementes gemäß 10 mit dem Statorträger und mit dem Getriebegehäuse.

Exemplary embodiments of the invention are explained below with reference to a drawing. Show in it:

• 1 a perspective view of a drive device with a drive or gear housing and an external-rotor electric motor accommodated therein for driving a cable drum as an output element of an adjustment device, in particular a (cable) window lifter, of a motor vehicle,
• 2 in a sectional view, the drive device with a first variant of the connecting element for positively locking a stator carrier of a stator-rotor assembly of the electric motor in the transmission housing,
• 3 in a perspective view the connecting element according to 1 ,
• 4 in a perspective view of the transmission housing with in a transition area between a housing shaft for inserting the stator-rotor assembly of the electric motor and an electronics compartment for a printed circuit board of a motor electronics housing latched connecting element according to 3 ,
• 5 in a sectional view, the transmission housing with a latched connecting element with molded latching legs (latching arms) and with a joining or latching element protruding into the housing shaft,
• 6 in a perspective view a second variant of the connecting element,
• 7 in a perspective view the second variant of the connecting element in a joint connection with the stator carrier,
• 8th A detail of the connecting element inserted in the housing shaft of the transmission housing in a side view according to FIG 7 ,
• 9 in a sectional view, the drive device with the second variant of the connecting element for positively locking the stator carrier of the stator-rotor unit in the transmission housing,
• 10 in a perspective view a third variant of the connecting element,
• 11 in a perspective view, the stator-rotor assembly of the electric motor with a radial groove or bead as a joining contour in the stator carrier,
• 12 in a representation according to 11 the stator-rotor assembly with the connecting element placed (positively) on the stator carrier according to 10 ,
• 13 A detail of the connecting element inserted in the housing shaft of the transmission housing in a side view according to FIG 10 , and
• 14 in a sectional view, the positive connection of the connecting element according to 10 with the stator carrier and with the gear housing.

Corresponding parts are provided with the same reference symbols in all figures.

1 shows an electromotive drive device 1 with a drive housing formed from a gear housing 2 and a motor housing 3, in which an external rotor motor as a brushless, electronically commutated electric motor 4 ( 2 ) is used. The transmission housing 2 and the motor housing 3 are detachably connected to one another by means of a flange connection 5, preferably wise screwed with flange screws 6. A permanent connection, e.g. B. a welded joint may be provided. In the exemplary embodiment, the external rotor motor 4 drives a cable drum 7 as an output element via a gear.

The gear of the drive device 1 is a 90° deflection gear, in particular a worm gear. Its worm wheel (not visible) which is arranged in the transmission housing 2 and which is coupled to the cable drum 7 around which a traction cable is wrapped, in particular of a window regulator of a motor vehicle, meshes with a worm 8 ( 2 ). A connector plug 9 with connecting lines 10 for supplying power and voltage to the drive device 1 serving as the adjustment drive of the motor vehicle and for supplying and/or outputting control and/or sensor signals is plugged into a connection receptacle 11 on the housing.

In the figures, the axial direction A and the radial direction R are illustrated by arrows, and the axis of rotation or shaft of a drive shaft or rotor shaft 12 illustrated in broken lines is denoted by D.

How out 2 As can be seen, the transmission housing 2 accommodates a stator-rotor assembly of the (external rotor) electric motor 4 via or in a housing shaft 2a coaxial with the axis of rotation (shaft axis) D of the rotor shaft 12 . The stator-rotor assembly includes a stator 13 with a stator or rotary field winding 14 and a rotor 15. The stator 13 has a stator base body 13a in the form of preferably a stamped sheet metal package and a hollow-cylindrical stator carrier (stator bushing) 16 and slot box insulation 17 with a collar-like cap portion 18 which encloses the stator support 16. The stator base body 13a with the slot box insulation 17 is seated on the stator carrier 12 in a rotationally fixed manner. This at least partially covers the stator teeth 13b formed by the stator base body 13a and pointing radially outwards in a star shape and carries the rotary field winding 14 formed from interconnected coils.

The coil ends of the coils of the rotary field winding 14 are connected in a star or delta connection and brought out as phase connections, which are referred to below as phase connection wires or simply as connection wires 21 . The cap section 18 of the groove box insulation 17 has a radially--that is, in the radial direction R--raised contour 22 with insertion grooves 23 ( 9 ) for the phase connection wires 21.

The rotor 7 has a pot-shaped rotor housing 19 with permanent magnets 20 arranged therein on the inside wall as a magnet arrangement and the rotor shaft 12 which is connected to the rotor housing 19 in a torque-proof manner. The rotor shaft 12, which carries the worm 8 in the exemplary embodiment, is guided to the transmission through the stator carrier 16, which is designed, for example, as a sintered component.

The transmission housing 2 of the drive device 1 has an electronics compartment 2b. A printed circuit board with connection points for the phase connection wires 21 is accommodated or inserted in the electronics compartment 2b in a manner that is not shown in detail. The electric motor 4 or the stator-rotor assembly with the rotor shaft 12 and with the stator carrier 16 is guided into the transmission housing 2 via the preferably hollow-cylindrical housing shaft 2a of the transmission housing 2 and is there axially and non-rotatably (rotationally fixed), preferably only with a positive fit. held or fixed. For this purpose, the transmission housing 2 has a housing or shaft opening 22 ( 4 and 8th ) via which the assembly of rotor 15 and rotor shaft 12 and stator 13 with stator carrier 16 and stator or rotary field winding 14 is inserted into the transmission housing 2 .

Worn by the rotor or motor shaft 12 worm 8 meshes in the assembled state with the rotatably mounted in the gear housing 2 worm wheel of the worm gear. In 2 a bearing (plain or radial bearing) 23 for the rotor or drive shaft 12 that is held in the hollow-cylindrical (socket-like) stator support 16 in a positive or non-positive manner can also be seen.

The drive device 1 has a separate connecting element 24 . This is provided and set up to fix the stator carrier 16 - and via this the stator or the stator-rotor assembly or the electric motor 4 - in the transmission housing 2, in particular exclusively, in a form-fitting manner. In other words, the connecting element 24 is preferably provided as a separate component. This is preferably first mounted in the transmission housing 2, preferably latched or clipped therein, before the stator carrier 16 or the stator-rotor assembly or the electric motor 4 is then pushed into the transmission housing 2 via the housing shaft 2a and there, preferably by latching or clipping, is held in a form-fitting manner.

In 3 a first embodiment of the connecting element 24 is shown, while the 4 and 5 in different views the assembly situation of the connecting element 24 in the transmission housing 2 and 2 show the assembly situation with the electric motor 4 accommodated in the transmission housing 2 or its stator-rotor assembly with the stator carrier 16. The 6 until 9 show a further embodiment of the connecting element 24 in analog representations.

The connecting element 24 has a connecting leg 24a with a joining element 25 formed thereon for the form-fitting connection to the stator carrier 16 and, in the exemplary embodiment, two latching legs or latching arms 24b ( 3 and 4 ) for positive connection with the transmission housing 2.

How out 3 As can be seen, connecting element 24 is approximately U-shaped with U-legs designed as latching legs 24b, on which latching hooks 26 are provided on the free-end or leg-end side. These are spaced apart and face each other in the embodiment. In the area of the electronics compartment 2b or in the area between this and the housing shaft 2a, i.e. in the transition area between the housing shaft 2a and the electronics compartment 2b of the transmission housing 2, the transmission housing 2 has a latching contour 27 that interacts with the connecting element 24 ( 4 ). The stator support 16 has a joining contour in the form of a latching opening 28 ( 2 ).

The latching contour 27 on the housing side has plug-in channels 29 running parallel to one another and axially, ie in the axial direction A, for receiving the latching legs 24b. The insertion channels 29 have a gripping contour 30 for latching the respective latching leg 24b of the connecting element 24 in that the latching hooks 26 of the latching leg 24b engage behind this contour 30 in the assembled state. The joining element 25 formed onto the connecting leg 24a of the connecting element 24 is designed as a spring-elastic latching arm with a latching element 25a.

in 5 In the pre-assembly state shown, with the connecting element 24 latched in the transmission housing 2 and the stator carrier 16 not yet inserted, the latching element 25a of the connecting element 24 formed on the end of the resilient joining element 25 protrudes into the housing shaft 2a of the transmission housing 2 . In the course of inserting the stator carrier 16 into the housing shaft 2a, the stator carrier 16 deflects the spring-elastic joining element 25 radially (in the radial direction R), which is indicated by the arrow 31 in 5 is illustrated. In the assembled state of the stator-rotor assembly or the electric motor 4, the latching element 25a latches into the corresponding latching opening 28 of the stator carrier 16 when the stator carrier 16 is pushed further into the transmission housing 2 ( 2 ).

The connecting leg 24a of the connecting element 24 has a number of axial grooves 32 corresponding to the number of phase connection wires 21 of the rotary field winding 14 of the stator 13 for receiving the phase connection wires 21 that are already bent radially. The axial grooves 32 are arranged in a connection pattern (connection grid) which is oriented tangentially and is radially spaced apart from the stator carrier 16 in the assembled state. The axial grooves 32 have clamping or support contours 32a directed inwards, which facilitate and/or improve alignment and fixing of the phase connection wires 21 in the axial grooves 32 .

Joining pins or struts 33 are formed on both sides of the connecting leg 24a of the connecting element 24 . These engage in corresponding joining grooves 34 when the connecting element 24 is accommodated in the transmission housing 2 . These are formed between radially spaced joining contours 34a, 34b of the transmission housing 2 ( 5 ).

In 6 a second embodiment of the connecting element 24 is shown. The connecting element 24 in turn has a connecting leg 24a with a joining element 25 formed thereon for the form-fitting connection to the stator carrier 16 and in turn two latching legs 24b ( 9 ) with snap-in hooks 26 formed on the ends for positive connection with the corresponding snap-in and gripping contours 27, 30 of the transmission housing 2. The joining element 25 formed onto the connecting leg 24a of the connecting element 24 is designed as a fork-like pair of latching arms with two radially oriented and spaced apart, elastic latching arms 25b, which can flex outwards in a resilient manner.

The connecting leg 24a of the connecting element 24 also has a number of axial grooves 32 corresponding to the number of phase connection wires 21 of the rotary field winding 14 of the stator 13 for receiving the phase connection wires 21 that are already bent radially. Joining pins or struts 33 are also formed on both sides of the connecting leg 24a of the connecting element 24 and, when the connecting element 24 is accommodated in the transmission housing 2, engage in corresponding joining grooves 34 between radially spaced joining contours 34a, 34b of the transmission housing 2 ( 8th ).

How from the 7 and 9 As can be seen, the stator carrier 16 has a radially raised (axial) strut 35, the axial length of which corresponds approximately to the length of the connecting element 24, ie the locking leg 24b, plus the width of the connecting leg 24a. The axial strut 35 is engaged by the latching arms 25b of the pair of latching arms in the course of the insertion of the stator carrier 16 into the gear unit house attacked on both sides. The two locking arms 25b spring out in opposite directions. In the pushed-in state of the stator support 16 and in the course of the latching of the connecting element 24, the latching arms 25b engage behind the axial strut 35 at its (rear) end facing the housing or shaft opening 22 ( 9 ).

In 9 it can also be seen that the cap section 18 of the groove box insulation 17 has a radially raised contour 36 with in 11 shown insertion grooves 37 for the phase connection wires 21. In the assembled state of the stator-rotor assembly with the stator 13 with the stator carrier 16 and with the slot box insulation 17 with the rotating field or stator winding 14 arranged thereon and with the rotor 15 with the rotor shaft 12, the radially bent phase connection wires 21 are in the insertion slots 37 of the contour 36 of the cap section 18 and in the axial grooves 32 of the connecting element 24 and thus aligned reliably and fail-safely for contacting with the printed circuit board inserted into the electronics compartment 2b of the transmission housing 2 . The axial grooves 32 of the connecting element 24 extend in the axial direction A and are open towards the housing shaft 2a or its housing or shaft opening 22, so that the phase connection wires 21, which are expediently already bent radially, can be pulled open when the electric motor 4 or the stator-rotor assembly is inserted are securely received in the housing shaft 2a in these axial grooves 32 or are received in the assembled state.

In 10 a third embodiment of the connecting element 24 is shown. The connecting element 24 in turn has a connecting leg 24a with axial grooves 32 formed therein for receiving the phase connecting wires 21 . Two latching legs 24b are formed on the connecting leg 24a and extend radially in this embodiment. The ends of the mutually spaced, elastic latching legs 24b are formed onto these latching hooks 26 as joining elements 25.

How from the 13 and 14 As can be seen, these radial latching legs 24b with latching hooks 26 formed on the ends are used both for connection to the stator carrier 16 and to the transmission housing 2. For the positive connection to the transmission housing 2, corresponding latching or rear gripping contours 30 are provided there. The latter has corresponding radial grooves or beads 38 for the form-fit connection with the stator carrier 16 .

When the connecting element 24 ( 13 ) The locking hooks 26 protrude as joining elements 25 into the housing shaft 2a in such a way that the clear width between the locking hooks 26 or joining elements 25 is at least slightly smaller than the diameter of the housing shaft 2a. The latching hooks 26 as joining elements 25 can move outwards radially or in the radial direction R when the electric motor 4 or the stator-rotor assembly is inserted into the transmission housing via the housing opening 22 and into the housing shaft 2a. In the intended (desired) position of the electric motor 4 or the stator-rotor assembly, the latching hooks 26 snap as joining elements 25 into the corresponding radial grooves (beads) 38 of the stator carrier 16 ( 14 ).

In summary, the invention relates to a drive device 1, having a brushless electric motor 4 with a rotating field or stator winding 14 and a bush-shaped 16 having stator 13 and with a rotor 15 revolving around this with a rotor shaft 12 guided through the stator carrier 16 and with a gear housing 2 with a housing shaft 2a, in which the electric motor 4 or the stator-rotor assembly can be accommodated or inserted. The drive device 1 also has a connecting element 24 with a connecting leg 24a with a joining element 25 formed thereon for the positive connection with the stator carrier 16 and with at least one latching leg 24b for the positive connection with the transmission housing 2, the transmission housing 2, in particular in the area of the electronics compartment 2b or in the area between this and the housing shaft 2a, a locking contour 27, 29, 30 that interacts with the connecting element 24 and the stator carrier 16 has a joining contour 28, 35 that interacts with the connecting element 24.

The claimed invention is not limited to the embodiment described above. Rather, other variants of the invention can also be derived from this by the person skilled in the art within the scope of the disclosed claims without departing from the subject matter of the claimed invention. In particular, all of the individual features described in connection with the various exemplary 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.

Instead of the separately provided snap-in or clip element, a snap-in element molded onto a cap section of a slot box insulation assigned to the stator and encompassing the stator support in the manner of a collar can also be provided, by means of which the, preferably exclusively, form-fitting connection of the stator support or the stator-rotor assembly or the electric motors is or will be manufactured with the gearbox housing. The cap section then preferably has one or the contour with (the) insertion grooves for the phase connecting wires. The receiving or axial grooves for the, in particular tangential, alignment of the phase connection wires, which are preferably already bent radially, are expediently provided in the gear housing, in particular formed there at the transition or in the transition area of the housing shaft to the electronics compartment in or on the gear housing. The latching element and/or a corresponding joining contour of the transmission housing is/are expediently designed in such a way that both reliable protection against axial slipping of the stator carrier or the stator-rotor assembly or the electric motor out of the transmission housing and anti-twist protection of the stator carrier in the transmission housing are ensured is.

The solution described can also be used not only in the specific application shown, but also in a similar design in other motor vehicle applications, such as door and tailgate systems, vehicle locks, adjustable seat and interior systems, and other electric drives in the vehicle.

Reference List

1

drive device

2

gear case

2a

case bay

2 B

electronics compartment

3

motor housing

4

Electric/outrunner motor

5

flange connection

6

flange screw

7

cable drum

8th

Snail

9

connector plug

10

connecting cable

11

connection recording

12

rotor/drive shaft

13

stator

13a

stator body

13b

stator tooth

14

stator/phase winding

15

rotor

16

Stator support/bush

17

slot box insulation

18

cap section

19

rotor housing

20

permanent magnet/magnet assembly

21

phase connection/wire

22

Housing/Shaft Opening

23

camp

24

fastener

24a

connecting leg

24b

locking leg/arm

25

joining element

25a

locking element

25b

locking arm

26

latch hook

27

locking contour

28

Joining contour/locking opening

29

plug-in channel

30

rear grip contour

31

Arrow

32

axial groove

32a

clamping/support contour

33

joining pin/strut

34

joining groove

34a, 34b

joining contour

35

Thrust/Strut

36

contour

37

insertion groove

38

Radial groove/bead

A

axial direction

D

axis of rotation

R

radial direction

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• DE 102016216888 A1 [0003]

Claims (10)

Having a drive device (1), in particular an electric motor window lifter drive of a motor vehicle - a brushless electric motor (4) with a stator (), which has a rotary field or stator winding () with a number of phase connecting wires () and a bush-shaped or hollow-cylindrical stator support (), and with a rotor () revolving around the stator () with a rotor shaft () coupled to this, which is guided through the stator carrier (), - A transmission housing (2) with an electronics compartment () and with a housing shaft (), in which the electric motor (4) or the stator-rotor assembly can be accommodated or inserted, and - A separate connecting element (24) for, in particular exclusively, form-fitting fixing of the stator support (16) in the transmission housing (2), the connecting element (24) having a connecting leg (24a) with a joining element (25) formed thereon for the form-fitting connection to the stator support ( 16) and at least one locking leg (24b) for positive connection with the transmission housing (2), and - the transmission housing (2), in particular in the area of the electronics compartment (2b) or in the area between this and the housing shaft (2a), a locking contour (27, 29, 30) interacting with the connecting element (24) and the stator carrier (16) has a joining contour (28, 35) which interacts with the connecting element (24). Drive device (1) after claim 1 characterized by an approximately U-shaped connecting element (24), the U-legs of which are designed as axially or radially oriented latching legs (24b) with latching hooks (26), in particular provided at the free end. Drive device (1) after claim 2 , characterized in that - the latching hooks (26) are spaced apart from one another and face or face away from one another, and/or - in the case of radially oriented latching legs (24b), the latching hooks (26) act as a joining element (25) for the form-fit connection with the stator carrier ( 16) are provided. Drive device (1) according to one of Claims 1 until 3 , characterized in that the latching contour (27, 29, 30) on the housing has at least one axially extending insertion channel (29) for receiving the latching leg (24b) and a rear gripping contour (30) for latching the respective latching leg (24b) of the connecting element (24). . Drive device (1) according to one of Claims 1 until 4 , characterized in that the on the connecting leg (24a) of the connecting element (24) molded joining element (25) is designed as a resilient latching arm (25b) with a latching element (25a). Drive device (1) after claim 5 , characterized in that the stator carrier (16) has a latching opening (28) which corresponds to the latching element (25a) of the connecting element (24) and into which the latching element (25a) latches when the stator carrier (16) is pushed into the transmission housing (2). . Drive device (1) according to one of Claims 1 until 4 , characterized in that the on the connecting leg (24a) of the connecting element (24) molded joining element (25) is designed as a fork-like locking arm pair (25b). Drive device (1) after claim 7 , characterized in that the stator carrier (16) has a radially raised axial strut (35) which the locking arm pair (25b) engages over on both sides in a resilient manner in the course of the insertion of the stator carrier (16) into the gear housing (2) and in the inserted state of the stator carrier ( 16) in the gearbox housing (2). Drive device (1) according to one of Claims 1 until 8th , characterized in that the connecting leg (24a) of the connecting element (24) has a number of axial grooves (32) corresponding to the number of phase connection wires (21) arranged in a receiving grid, in particular tangentially oriented and spaced radially from the stator carrier (16), for receiving the Has, in particular radially bent, phase connecting wires (21). Drive device (1) according to one of Claims 1 until 9 , characterized in that the stator (13) is assigned slot box insulation (17) with a collar-like cap section (18) which encompasses the stator support (16) and has a contour (36) with insertion slots (37) for the phase connecting wires (21), wherein the phase connection wires (21) are bent radially in the insertion grooves (37) of the contour (36) of the cap section (18) and/or the connecting element (24).

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