Engine assembly

Abstract

Motor assembly (2) with an electric motor (12) comprising a motor housing (24), and with an electronics unit (8), a) a first housing shell designed as a motor support (14) to which the motor housing (24) is fastened, b) a second housing shell designed as a cooling cover (16), and c) an electronics carrier (18) sandwiched between the cooling cover (16) and the motor carrier (14), - wherein the electronics carrier (18) has a first circumferential seal (70) on the cooling cover side, which seals a first contact edge (72) formed between the electronics carrier (18) and the cooling cover (16), - wherein the electronics carrier (18) has a second circumferential seal (74) on the motor carrier side, which seals a second contact edge (76) formed between the electronics carrier (18) and the motor carrier (14), - wherein the electronics carrier (18) carries an electronic converter circuit (20) which is connected in a connection area (84a) of a motor carrier-side surface of the electronics carrier (18) by means of contact elements (42) to phase connections (40) of the electric motor (12), and - wherein the connection region (84a) is delimited in a fluid-tight manner by a secant-like inner web (78) of the second seal (74) from a circuit region (84b) of the motor-mount-side surface of the electronics carrier (18), on which at least one electronic component (48, 50, 52) of the converter circuit (20) is arranged.

Description

The invention relates to a motor assembly with an electric motor comprising a motor housing, and an electronics unit. It further relates to an actuator, in particular a transmission actuator, for a motor vehicle, having an engine assembly of this type, and to a motor vehicle transmission provided with an actuator of this type.WO 2013 / 037 454 A2 discloses an electric motor which can be part of an actuator for a motor vehicle transmission, in particular for a direct transmission (DSG). In the case of a hydraulic actuator, the electric motor can serve to drive a hydraulic pump.The known electric motor has for this purpose a cylindrical motor or stator housing in which a stator assembly with a rotating field winding is mounted fixed to the housing and a rotor together with a rotor fixed to the rotor is mounted rotatably. For coupling, for example, to the hydraulic pump of the actuator, the motor shaft is led out on a housing side of the electric motor, forming a shaft journal. The opposite housing side has a connection flange for fastening the actuator, for example, to an electronics unit having an electronics housing and power or motor electronics.During operation of such an electric motor, in particular when used as a transmission actuator for a DSG of a motor vehicle, the latter is frequently exposed to a moist environment. Under such environmental conditions, there is the risk that moisture, for example water, penetrates into the region of the motor electronics via housing interfaces of the electronics housing and / or of the connection flange. This is highly undesirable, particularly with regard to a risk of short circuit.In a typical application as a transmission actuator, the electric motor is coupled in terms of drive technology to a hydraulic oil pump within an oil sump of a transmission housing. For the purpose of cooling the rotating field winding, it is known here that the electric motor is at least partially located within a (hydraulic) hydraulic chamber in the oil sump. Expediently, the electronics unit is installed close to the electric motor, so that an electronics housing that is as fluid-tight as possible is also required with respect to oil for protecting the sensitive motor electronics.The electric motor or the associated motor assembly of the actuator is to be designed or designed structurally for a relatively large temperature range. The temperature range in the oil sump to be controlled or taken into account is typically between, for example, -40° C. and +130° C. It is also to be taken into account here that the oil used has a certain or specific viscosity which is temperature-dependent and decreases with increasing temperature, that is to say is greater at lower temperatures than at higher temperatures.In particular at higher operating temperatures or at temperatures rising as a result of operation, the risk of leaks therefore also increases. The reason for this is that, on the one hand, the avoidance of leaks requires a correspondingly dense electronic housing, while, on the other hand, due to the high temperature fluctuations, housing expansions, that is to say different expansions of the electronic housing and / or of the connection flange, increasingly tend to leaks at increasing temperatures and thus decreasing viscosity of the oil used, which leaks exhibit a comparatively less pronounced inclination at low temperatures and thus high viscosity of the oil.Electronic housings for engine assemblies of a motor vehicle are known from DE 101 27 169 A1, US 2014 / 0 241 917 A1, JP 2012-241 593 A, DE 10 2013 202 586 A1 and DE 10 2011 085 054 A1.The object of the invention is to specify a motor assembly which provides a fluid-tight electronics housing for motor electronics. Furthermore, an actuator for a motor vehicle having such an engine assembly and a motor vehicle transmission having such an actuator should be specified.With regard to the engine assembly, the object mentioned is achieved according to the invention with the features of claim 1, with regard to an actuator comprising the engine assembly with the features of claim 10, and with regard to a motor vehicle transmission with such an actuator with the features of claim 11. Advantageous embodiments and developments are the subject matter of the respective dependent claims.The motor assembly according to the invention has an electric motor with a motor housing, and an electronic unit. The electronics unit comprises a first housing shell designed as a motor carrier, to which the motor housing is fastened, a second housing shell designed as a cooling cover, and an electronics carrier which is arranged in a sandwich-like manner between the cooling cover and the motor carrier. The electronics carrier has a first circumferential seal on the cooling cover side, i.e. on a side facing the cooling cover, wherein the first seal seals a first contact edge formed between the electronics carrier and the cooling cover. The electronics carrier furthermore has a second circumferential seal on the motor carrier side, i.e. on a side facing the motor carrier, wherein the second seal seals a second contact edge formed between the electronics carrier and the motor carrier.The cooling cover, the motor carrier, and the electronics carrier thus form an essentially closed and fluid-tight electronics housing, wherein the electronics carrier at least partially forms a housing wall running in the circumferential direction. The sandwich-like arrangement furthermore forms two separate housing spaces. A first housing space is formed between the electronics carrier and the cooling cover, wherein the first housing space is sealed with respect to the first contact edge by means of the first seal. A second housing space is correspondingly formed between the electronics carrier and the motor carrier, wherein the second housing space is correspondingly sealed by means of the second seal at the second contact edge.In other words, the electronics carrier thus divides the housing interior space into two partial regions in a fluid-tight manner. In comparison with the prior art, the risk of leaks from an oil to (engine) electronics is thus substantially avoided. The electric motor, which during operation is at least partially inserted into oil, is arranged in a different housing part region than the sensitive electronics. Furthermore, it is thereby made possible to design and design the first seal and the second seal independently of one another.In a preferred installation situation, the electric motor is at least partially located in an oil sump of a motor vehicle transmission, so that the second seal is designed in particular for a fluid-tight sealing of the second contact edge with respect to oil. In particular, it is necessary for the second seal to reliably avoid leaks over a large temperature range.The first seal is arranged on the opposite electronics carrier side and is therefore designed only with respect to an ingress of moisture, in particular with respect to an ingress of water. As a result, the production of the first seal is particularly cost-effective, which is advantageously transferred to the production costs of the engine assembly.In a suitable development, the motor support and the cooling cover are braced directly against one another. This realizes sufficient pressing or sealing pressure on the first and second seals. The motor support and the cooling cover are preferably not directly fastened to the electronics support, but instead are in particular braced with each other in such a way that essentially only compressive forces, but no appreciable bending or torsion forces, are exerted on the electronics support. Within the scope of the invention, the electronics carrier is thus held clamped or fixed in a clamped manner between the cooling cover and the motor carrier in the region of the contact edges.In a suitable embodiment, the first seal and the second seal are arranged in alignment with one another in the direction of action of the bracing of the engine mount and of the cooling cover. As a result, the first and the second seal are supported on one another in the assembled state, which contributes to avoiding bending or torsion forces acting on the electronics carrier. By avoiding bending and / or torsional forces on the electronics carrier, it is therefore ensured that motor electronics supported on the electronics carrier are reliably arranged.According to the invention, the motor electronics comprise an electronic converter circuit carried by the electronics carrier for energizing and operating the electric motor. For this purpose, the converter circuit is connected to phase connections of the electric motor in a connection region of a surface of the electronics carrier on the motor carrier side by means of contact elements. Expediently, the connection region is arranged on the electronics carrier in such a way that it is aligned with the motor housing fastened to the motor carrier, in particular in the region of an outer periphery of the motor housing. The connection region is delimited in a fluid-tight manner by a soap-like inner web of the second seal from a circuit region of the surface of the electronics carrier on the motor carrier side, on which circuit region at least one electronic component of the converter circuit, in particular an intermediate capacitor and / or an associated choke coil, is arranged.The saw-edged inner web thus divides the second housing space bordered by the second seal into the connection region and the circuit region. In other words, the inner web runs from one long side of the preferably elongate electronics carrier to the opposite long side. In the preferred installation situation, the second housing space is arranged in the region of an oil sump. By means of the inner web or the fluid-tight delimitation, produced thereby, between the circuit region and the connection region, an additional installation space for electronic components of the converter circuit is created with the circuit region.Passive components with a comparatively large installation size, such as the intermediate capacitor or the choke coil, are preferably arranged within the circuit region, since they are less sensitive to the temperatures occurring near the oil sump during operation, on the one hand. On the other hand, this allows a cooling cover which is particularly compact in terms of installation space, which creates additional freedom for the use of an existing installation space.In a particularly expedient embodiment, a number of spacer elements protruding on the motor carrier side are integrally formed on the cooling cover, which spacer elements at least partially surround the electronics carrier and each bear against a corresponding bearing surface of the motor carrier. The spacer elements have approximately the height of the electronics carrier, so that a predefined contact pressure is defined when the cooling cover is clamped to the motor carrier. By means of the spacing elements suitably arranged on the circumferential side, bending or torsion of the cooling cover during the clamping is prevented in a structurally simple manner. Furthermore, as a result, a substantially identical pressing or sealing pressure can be applied along the circumferential direction in the region of the first and second contact edges.In a suitable development, the cooling cover and the motor carrier are screwed to one another in the region of the spacer elements. This realizes a structurally simple bracing between the cooling cover and the motor support, wherein the screw fastening contributes to the avoidance of flexural or torsional forces occurring in the region of the spacer elements in a supporting manner.In an advantageous embodiment, the electronics unit has a connector plug connector. The connector plug is integrated in one piece into the electronics carrier and makes contact with the converter circuit by means of a stamped grid arranged within the electronics carrier. The stamped grid is preferably also connected to the contact elements in the connection region. The connector is formed on the end face of the electronics carrier outside the first and second seals, i.e. the connector is arranged substantially outside the first and second contact edges. As a result, no additional sealing of the cooling cover, the motor support and / or the electronics support with respect to the connector plug is necessary. This is advantageous in particular with regard to different coefficients of expansion of the cooling cover, of the motor support and of the electronics support in the event of temperature fluctuations occurring during operation.The inner web is not pressed by a clamping, i.e. the pressing or sealing pressure for fluid-tight delimitation between the connection region and the circuit region is generated only by the electronics carrier in the assembled state. Due to thermal expansion during operation or due to wear, a fluid-tight seal is sometimes not readily ensured permanently by the inner web.Therefore, in a particularly preferred development, the stamped grid is partially or stepwise bent in the region of the inner web, for stabilizing the electronics carrier. As a result, the electronics carrier is additionally reinforced in the region of the inner web, so that a fluid-tight delimitation between the connection region and the circuit region by means of the inner web is reliably ensured. For this purpose, the stamped grid takes over at least partially a supporting role of the electronics carrier, wherein the stamped grid is cranked or embroidered, for example, in the region of the inner web in order to increase a bending moment of the electronics carrier in this region.In a possible development, for example, a plurality of parallel conductor tracks of the stamped grid are arranged above the inner web running obliquely at an angle, wherein the conductor tracks are partially bent over transversely to their longitudinal direction in the region of the inner web, that is to say the conductor tracks have an approximately L-shaped cross section in this region.In an advantageous embodiment, the stamped grid has a number of adjacent conductor tracks, wherein the conductor tracks have beams protruding perpendicularly to their longitudinal direction in the region of the inner web as step-like bending regions. The step height formed thereby is substantially defined by the width of the beams. The conductor tracks are thus approximately cross-shaped in plan view, wherein the horizontal cross web is formed by the bar. The beams of adjacent conductor tracks overlap at least partially to reinforce the electronics carrier.The motor carrier and the cooling cover are preferably produced as die cast parts from an aluminum material, wherein the electronics carrier is preferably designed as an injection molded part with an injection molded stamped grid. In a suitable embodiment, the first and the second seal are applied directly to the electronics carrier in a multicomponent injection molding process. To avoid leaks, the first seal is suitably made of a water-resistant first elastomer material and the second seal is made of a heat- and oil-resistant second elastomer material.In a preferred application, the engine assembly is part of an actuator, in particular a transmission actuator, for a motor vehicle. In an intended installation situation, the actuator is arranged in a motor vehicle transmission, for example in a direct shift or dual clutch transmission, for shifting the gears. In this case, the electronics unit is screwed to a transmission housing by means of fastening surfaces, wherein the motor housing or the electric motor is at least partially accommodated in an oil sump of the motor vehicle transmission. For the fluid-tight sealing of the oil sump with respect to the transmission housing, an annular seal is arranged in the region of the motor housing.Exemplary embodiments of the invention are explained in more detail below with reference to a drawing. Shown therein are: FIG. 1 shows a perspective illustration of an engine assembly for a transmission actuator of a motor vehicle transmission, comprising an electric motor and an electronic unit, FIG. 2 shows a perspective illustration of a motor carrier of the electronics unit with the electric motor, FIG. 3 is an exploded perspective view of the motor assembly, FIG. 4 shows a perspective illustration of an electronics carrier of the electronics unit with a view to a first seal, FIG. 5 shows a perspective illustration of the electronics carrier of the electronics unit with a view to a second seal with an inner web, FIG. 6 shows a schematic sectional illustration of the transmission actuator in an installation situation on a transmission housing of the motor vehicle transmission, FIG. 7 shows a schematic and simplified sectional illustration of an alternative embodiment of the gear actuator, with a bent stamped grid, FIG. 8 shows a perspective illustration of a detail of three conductor tracks of the stamped grid and the inner web, FIG. 9 shows a perspective illustration of a detail of an alternative embodiment of the three conductor tracks, FIG. 10a shows a perspective illustration of a second alternative embodiment of the conductor tracks with horizontally projecting beams as step-like bending regions, FIG. 10 bshows in plan view the conductor tracks with the beams in an unbent state, FIG. 11 shows a schematic sectional illustration of the electronics unit with a first alternative configuration of the bending area in the area of the inner web, and FIG. 12 shows a schematic sectional illustration of the electronics unit with a second alternative configuration of the bending region in the region of the inner web.Parts and sizes corresponding to one another are always provided with the same reference numerals in all figures.FIG. 1 shows an engine assembly 2 for an actuator 4 of a motor vehicle transmission 6, in particular of a direct transmission. The motor assembly 2 of the actuator 4, also referred to below as a gear actuator, comprises an elongate electronic unit 8 with a connection plug connector 10 projecting on the narrow side, and an electric motor 12 fastened to the electronic unit 8.The electronics unit 8 comprises a first housing shell designed as a motor carrier 14, a second housing shell designed as a cooling cover 16, and an electronics carrier 18 arranged between the motor carrier 14 and the cooling cover 16 in a sandwich-like manner. By means of the connection plug connector 10, a converter circuit 20 of the electronics carrier 18 is electrically conductively coupled to motor vehicle electronics, not shown in more detail, or to a motor vehicle train for energizing and operating the electric motor 12.The motor carrier 14 and the cooling cover 16 are preferably produced from an aluminum material in a die casting process, wherein the electronics carrier 18 is preferably produced as an injection molded part from a plastic material.The motor carrier 14 and the cooling cover 16 are screwed to one another by means of six circumferentially distributed fastening screws 22, wherein the electronics carrier 18 is held clamped or fixed in a clamped manner between the motor carrier 14 and the cooling cover 16. As can be seen in particular in FIG. 2, a cylindrical motor housing 24 of the preferably brushless electric motor 12 is screw-fastened to the motor carrier 14.FIG. 3 shows the motor assembly 2 in an exploded view in a disassembled state.The cylindrical motor housing 24 of the electric motor 12 illustrated is formed substantially by a first pot-like housing half 26 aand a second pot-like housing half 26 b, wherein the housing half 26 ais dimensioned with respect to an axial direction A with a housing height which is approximately twice as high as the housing half 26 b. The housing half 26a is fastened in the assembled state to the motor support 14 by means of three screw bolts 28 which are arranged at the end face on the surface facing the motor support 14 in an approximately uniformly offset manner by 120°. In the assembled state, the screw bolts 28 are screw-fastened-as can be seen in particular in FIG. 2-from the inside of the motor carrier 14 by means of a respective hexagonal nut 30 to the motor carrier 14 in the region of a cylindrical bulge 32.In the assembled state, a rotor shaft 34 of a rotor of the electric motor 12 coupled thereto by drive means centrally protrudes through the housing half 26 a. On the motor-carrier-side end face of the rotor shaft 34, a magnetic cap 36 is attached in a rotationally fixed manner as a magnetic dipole generator. The cap 36 has a number of permanent magnets and, in the assembled state, lies in a receptacle 38 of the electronics carrier 18. In the region of the receptacle 38, a Hall sensor element, not shown in detail, is arranged, which monitors a motor speed of the electric motor 12 by the alternating magnetic field of the rotating cap 36 during operation of the motor assembly 2.The electric motor 12 has three phase connections 40 projecting from the housing half 26 aon the end face, which are electrically conductively coupled to phase windings of a (three-phase) rotating field winding, not shown in more detail, of a stator assembly. The phase terminals 40, also referred to below as insulation displacement contacts, are in contact with a respective motor-side contact element 42 of the electronics carrier 18 for energizing the rotating field winding in the assembled state. The contact elements 42 of the electronics carrier 18 are designed in particular as blade contacts.The electronic converter circuit 20 of the electronics carrier 18 comprises a printed circuit board 44 having a number of switching elements, not designated in more detail, and a passive component group 46. the component group 46 substantially comprises an intermediate circuit capacitor 48, a choke coil 50, and a protection fuse 52. The component group 46 is arranged on the opposite planar side, facing the motor carrier 14, of the electronics carrier 18, correspondingly also referred to below as the underside.For contacting the printed circuit board 44 with the component group 46, the electronics carrier 18 has an integrated (injection-molded) stamped grid 54 as part of the converter circuit 20. The stamped grid 54 electrically conductively couples the individual electronic components by means of a number of blade contacts, not designated in any more detail. The stamped grid 54 is furthermore electrically conductively connected to the connector 10.In the assembled state, the component group 46 is arranged within a trough-like bulge 56 of the motor carrier 14. For protection against vibrations, the component group 46 is at least partially cast around with a cast part 58 made of a damping plastic material within the bulge 56.The printed circuit board 44 is thermally conductively coupled to the cooling cover 16 by means of a thermally conductive layer 60, for example in the form of a thermally conductive adhesive. The cooling cover 16 has on its outer surface, i.e. on the cooling cover side facing away from the electronics carrier 18, a number of integrally formed cooling ribs 62. By way of example, only one cooling fin 62 is provided with a reference sign in the figures.In the region of the cooling ribs 62, a cutout 64 is arranged, which, in the assembled state, allows an air exchange from the printed circuit board 44 to a region outside the cooling ceiling 16. The recess 64 is covered in a watertight manner with an air-permeable, semi-permeable membrane 66 in the assembled state. The diaphragm 66 thus allows, on the one hand, both pressure compensation and air exchange for cooling purposes. On the other hand, the membrane 66 counteracts water or moisture penetration in a structurally simple manner in order to protect the converter circuit 20. The cooling ribs 62 and the diaphragm 66 are covered by a common cover 68 in the assembled state.FIGS. 4 and 5 illustrate the structure of the electronics carrier 18 in more detail. The electronics carrier 18 has, on the cooling cover side, a first seal 70 running in the circumferential direction, by means of which a first contact edge 72 is sealed off in a fluid-tight manner between the bearing of the cooling cover 16 on the electronics carrier 18. On the opposite side, i.e. on the motor carrier side, the electronics carrier 18 has a second seal 74 which runs in a complementary manner and which correspondingly seals a second contact edge 76 between the bearing of the electronics carrier 18 on the motor carrier 14 in a fluid-tight manner.The seals 70, 74 are in particular arranged aligned with one another in such a way that, when the cooling cover 16 is screw-fastened to the motor carrier 14, the seals 70 and 74 are essentially supported mutually by means of the fastening screws 22. As a result, the electronics carrier 18 is essentially only subjected to compressive forces in the region of the contact edges 72, 76 during clamping or clamping attachment between the motor carrier 14 and the cooling cover 16, without significant torsional or bending forces acting on the electronics carrier 18.The seals 70, 74 and the contact edges 72, 76 are arranged substantially behind the connector 10, i.e. the connector 10 is arranged on an outer periphery of the electronics carrier 18 in such a way that it protrudes beyond both the cooling cover 16 and the motor carrier 14. The connector 10 is thus coupled to the interior of the electronics unit 8 merely by means of the injection-molded stamped grid 54, so that the connector 10 does not require any additional sealing.The seal 74 has an inner web 78 which, in the assembled state, intersects the seal 74 in a manner like a leaflet in a region between the bulges 32 and 56. That is, the inner web 78 extends from one long side of the seal 74 to the opposite long side, wherein the inner web 78 is preferably directed approximately perpendicular to the two long sides. The electronics carrier 18 has three circumferential indentations 80 in the region of the bulge 32, in each of which indentations a fastening screw 22 is arranged in the assembled state.The seals 70, 74 have an approximately meandering embossing for improved force distribution during the clamping fastening of the electronics carrier 18. The seals 70 and 74 are preferably manufactured in a multi-component injection molding process together with the electronics carrier 18.In the assembled state, an upper-side housing space 82 is formed between the electronics carrier 18 and the cooling cover 16. The housing space or electronics space 82 is at least partially filled with the layer 60, as can be seen in particular in FIG. 6, and is separated by means of the electronics carrier 18 in a fluid-tight manner from a housing space 84 on the underside between the electronics carrier 18 and the motor carrier 14. The housing space 84 is substantially formed by the partial regions 84 a, 84 bdefined by the bulges 32 and 56. In the following, the partial region 84 aof the bulge 32 is also referred to as a connection region 84 a, and the partial region 84 bof the bulge 56 is referred to as a circuit region 84 b. The connecting region 84 aand the circuit region 84 bare delimited by the inner web 78 in a fluid-tight manner between the electronics carrier 18 and the motor carrier 14.In the region of the indentations 80, a spacer element 86 of the cooling cover 16 is arranged in alignment with an outer circumference. The spacer elements 86 encompass the electronics carrier 18 and bear against the motor carrier 14 to form a contact surface 88 in each case. The spacer elements 86 are integrally formed on the cooling cover 16 in the region of the contact edge 72, and project beyond the cooling cover 16 in the direction of the motor carrier 14. The spacer elements 86 preferably have a height that corresponds approximately to the thickness of the electronics carrier 18.The electronics unit 8 also has four projections 90a of the cooling cover 16 projecting on the circumferential side and four projections 90b of the motor support 14 arranged in a complementary manner thereto. The projections 90 aand 90 bare arranged in the assembled state over a large area and in alignment with one another to form a fastening surface 92 in each case.The projections 90a surround the electronics carrier 18 in sections similar to the spacer elements 86, wherein the projections 90a preferably have a height-similar to the spacer elements 86-which corresponds approximately to the thickness of the electronics carrier 18. The spacer elements 86 and the projections 90 atherefore ensure a predefined pressing or sealing pressure for the clamping between the cooling cover 16 and the engine carrier 14 during the assembly of the engine assembly 2.The projections 90 a, 90 bare each formed in pairs in the region of the connection region 84 aand in the region of the circuit region 84 b, wherein the projections 90 a, 90 bin the connection region 84 aare in particular configured in the form of eyes, and wherein the projections 90 a, 90 bin the circuit region 84 bare in particular configured in the form of lugs.The projections 90a, 90b have five screw holes 94 which are arranged distributed in the circumferential direction. As can be seen in particular in FIG. 6, in the assembled state of the transmission actuator 4 on the motor vehicle transmission 6, a fastening screw 96 for screw fastening the transmission actuator 4 to a transmission housing 98 of the motor vehicle transmission 6 is arranged in each case within the screw holes 94. As a result, the motor assembly 2 is fixed to the transmission housing 98 in the region of the fastening surfaces 92. The gear housing 98 has a large thermal mass, and acts as a heat sink for the motor assembly 2, for example, in the assembled state.In the illustrated mounting state of the transmission actuator 4, the electric motor 12 is coupled in terms of drive technology to an oil pump, not shown in detail, and is at least partially present in an oil of an oil sump 100. For the fluid-tight sealing of the oil sump 100, an annular seal 102 is arranged between the bulge 32 and the transmission housing 98.For additional stiffening of the electronics carrier 18, the stamped grid 54 is designed to be curved in the region of the inner web 78, as indicated in FIG. 7. Various exemplary embodiments with regard to partial or step-like bends or bends of the stamped grid 54 are explained in more detail below with reference to FIGS. 8 to 12.FIG. 8 shows a section of three adjacent and substantially parallel conductor tracks 104 a, 104 b, 104 cof the stamped grid 54 in the region of the inner web 78. In this exemplary embodiment, a conductor longitudinal direction L of the conductor tracks 104 a, 104 b, 104 cis arranged substantially parallel to the course of the inner web 78, wherein the middle conductor track 104 bis partially bent directly in the region of the inner web 78. As can be seen comparatively in FIG. 8, the conductor track 104 bhas an approximately L-shaped cross-sectional profile in this region, as viewed along the conductor longitudinal direction L, wherein the horizontal L-leg is designed as a tab 106 bent towards the motor carrier 14.FIG. 9 shows an embodiment in which the conductor tracks 104 a, 104 b, 104 care positioned oriented obliquely with respect to the inner web 78, that is to say the conductor longitudinal direction L is arranged rotated by an angle with respect to the inner web 78 in a skew manner about the axial direction A. The conductor tracks 104 a, 104 b, 104 care bent over partially in the region of tabs 106 a, 106 b, 106 cprotruding transversely to the conductor longitudinal direction L, similarly to the exemplary embodiment of FIG. 8. The bent-over lugs 106 a, 106 b, 106 clap one another along the course of the inner web 78 in the transverse direction of the conductor longitudinal direction L.The exemplary embodiment shown in FIGS. 10 aand 10 b substantially shows three strip conductors 104 a, 104 b, 104 cthat are bent over or can be bent over in a step-like manner. The conductor tracks 104 a, 104 b, 104 ccomprise arms or beams 108 protruding transversely to the conductor longitudinal direction L in the region of the inner web 78, which arms or beams at least partially overlap along the conductor longitudinal direction L in the bent-over state and thus stiffen the electronics carrier 18 with respect to a bending moment in this region. The bending edges in the bent-over state are indicated in FIG. 10 a by dashed lines. The step height of the stamped grid 54 formed as a result is essentially predefined by the width of the beams 108.FIGS. 11 and 12 show, in a sectional illustration along the inner web 78, the electronics unit 8 in plan view of a bending of the stamped grid 54 The bent region of the stamped grid 54 extends in this case for force dissipation towards the circumference as far as between the contact edges 72, 74. In FIG. 12, the bent region has a tapering towards the outer circumference, as a result of which a saving in material is realized in comparison with the exemplary embodiment of FIG. 11.The invention is not limited to the above-described embodiments. Rather, other variants of the invention can also be derived from this by the person skilled in the art without departing from the subject matter of the invention. In particular, all the individual features described in connection with the exemplary embodiments can also be combined with one another in another manner without departing from the subject matter of the invention.

Claims

Motor assembly (2) with an electric motor (12) comprising a motor housing (24) and with an electronics unit (8) comprising: a) a first housing shell formed as a motor carrier (14), to which the motor housing (24) is fastened, b) a second housing shell formed as a cooling cover (16), and c) an electronics carrier (18), which is arranged in a sandwich-like manner between the cooling cover (16) and the motor carrier (14), - wherein the electronics carrier (18) has, on the cooling cover side, a first circumferentially encircling seal (70), which seals a first contact edge (72) formed between the electronics carrier (18) and the cooling cover (16), - wherein the electronics carrier (18) has, on the motor carrier side, a second circumferentially encircling seal (74), which seals a second contact edge (76) formed between the electronics carrier (18) and the motor carrier (14), wherein the electronics carrier (18) carries an electronic converter circuit (20) which is connected in a connection region (84a) of a motor carrier-side surface of the electronics carrier (18) by means of contact elements (42) to phase connections (40) of the electric motor (12), and - wherein the connection region (84a) is delimited in a fluid-tight manner by a saw-edge-like inner web (78) of the second seal (74) from a circuit region (84b) of the motor carrier-side surface of the electronics carrier (18), on which at least one electronic component (48, 50, 52) of the converter circuit (20) is arranged.Engine assembly (2) according to claim 1, wherein the engine support (14) and the cooling cover (16) are braced directly against one another.Engine assembly (2) according to Claim 2, wherein the first seal (70) and the second seal (74) are arranged in alignment in the direction of action of the bracing of the engine mount (14) and of the cooling cover (16).Motor assembly (2) according to one of Claims 1 to 3, wherein a number of spacer elements (86) protruding on the motor carrier side is integrally formed on the cooling cover (16), said spacer elements at least partially enclosing the electronics carrier (18) and each bearing against a bearing surface (88) of the motor carrier (14).Engine assembly (2) according to Claim 4, wherein the cooling cover (16) and the engine mount (14) are screwed to one another in the region of the spacer elements (86).Motor assembly (2) according to one of Claims 1 to 5, wherein the electronics unit (8) has a connection plug connector (10), and wherein the connection plug connector (10) is integrated integrally into the electronics carrier (18), and wherein the connection plug connector (10) is contacted with a stamped grid (54) of the converter circuit (20) arranged within the electronics carrier (18).Motor assembly (2) according to Claim 6, wherein the stamped grid (54) is bent partially or in a step-like manner in the region of the inner web (78) in order to stabilize the electronics carrier (18).Motor assembly (2) according to Claim 7, wherein the stamped grid (54) has a number of adjacent conductor tracks (104a, 104b, 104c), wherein the conductor tracks (104a, 104b, 104c) have beams (108) protruding perpendicularly in the region of the inner web (78) as step-like bending regions, and wherein the beams (108) of adjacent conductor tracks (104a, 104b, 104c) at least partially overlap.The engine assembly (2) of any of claims 1 to 8, wherein the first seal (70) and the second seal (74) are directly applied to the electronics mount (18) in a multi-component injection molding process.Actuator (4), in particular a transmission actuator, for a motor vehicle comprising an engine assembly (2) according to one of Claims 1 to 9.Motor vehicle transmission (6) with an actuator (4) according to Claim 10, - wherein the electronics unit (8) is screwed to a transmission housing (98), - wherein the motor housing (24) is at least partially accommodated in an oil sump (100), and - wherein an annular seal (102) is arranged on the motor carrier (14) in the region of the motor housing (24), said annular seal sealing the oil sump (100) against the transmission housing (98) in a fluid-tight manner.

Images