DE102016222815A1 - transmission operator - Google Patents

Abstract

The invention relates to a transmission actuator (2) for a motor vehicle, having a, in particular brushless, electric motor (4) with a pole pot - like motor housing (6) open at both end faces (20, 40) and a motor shaft (8) mounted therein Electronics housing (18), wherein the motor housing (6) at a first end face (40) has a tubular housing extension (46), and wherein the housing extension (46) for attachment to a transmission housing (36) in a separate, in particular with the transmission housing ( 36) fastened or fastened, mounting flange (38) is plugged in the manner of a press fit.

Description

The invention relates to a transmission actuator for a motor vehicle, with a, in particular brushless, electric motor with a motor housing and a motor shaft mounted therein, and with an electronics housing.

For actuating a motor vehicle transmission, in particular a direct shift transmission (DSG), it is known to use electromotive transmission actuators. The electric motor of such a transmission actuator generally has a cylindrical motor or stator housing, in which a stator with a rotating field winding fixed to the housing and a rotor is rotatably mounted together with a rotor-fixed rotor or motor shaft.

During operation of such an electric motor, in particular when it is used as a transmission actuator for a DSG of a motor vehicle, it is often exposed to a humid environment. Under such environmental conditions, there is a risk that moisture, for example water, penetrates via housing interfaces of the electronics housing and / or the motor housing into the area of the engine electronics. This is extremely undesirable, especially with regard to a risk of short circuits.

The transmission actuator is usually coupled in terms of drive technology with a hydraulic oil pump within an oil sump of a transmission housing. For the purpose of cooling the rotating field winding of the stator, it is possible in this case that the motor housing of the electric motor rests at least partially within a (hydraulic, transmission) oil in the oil sump. As a result, the heat generated by the current of the rotating field winding is at least partially dissipated to the oil.

For coupling, for example, to a hydraulic pump of the transmission actuator, the motor shaft of the electric motor is led out to form a shaft journal on an A-side (housing) end face of the motor housing. For attachment of the transmission actuator to the motor vehicle transmission, the end face of the motor housing generally has a molded-on flange.

From the DE 10 2014 223 804 A1 an electric machine with a housing part is known, on which a separate mounting flange is placed with an approximately circular collar. The collar has a number of radially inward elevations which rest on the outside circumference of the housing part. Between the surveys, a weld is provided in each case, which secures the attachment flange cohesively to the housing part.

From the DE 2012 222 602 A1 For example, an electric machine with a housing with a mounting flange arranged thereon is known. The mounting flange is formed here as a flange, which is pushed onto the housing and then welded to it.

There are applications in which the motor vehicle transmission in the assembled state opposite, B-side, (housing) end face of the Getriebeaktuators has a flange for attachment of the motor housing, for example, on a power or engine electronics receiving electronics housing. In such applications in which the motor housing should preferably have flanges for fastening as well as housing openings on both end faces, problems arise with regard to a fluid-tight seal of the housing interior. On the one hand, the electric motor and in particular the engine electronics should be sealed against the oil and, on the other hand, the interface between the electric motor and the motor vehicle transmission reliably prevent ingress of water or moisture. Furthermore, problems arise with regard to manufacturing and position accuracy of the bearing and mounting of the motor shaft and of the shaft journal arranged thereon.

The invention has for its object to provide a suitable transmission actuator for a motor vehicle.

The object is achieved with the features of claim 1. Advantageous embodiments and further developments are the subject of the dependent claims.

The transmission actuator according to the invention is suitable and suitable for use in a motor vehicle, preferably in a motor vehicle transmission such as a direct shift transmission. For this purpose, the transmission actuator on, in particular brushless, electric motor, which is arranged in an open at both ends pole-like motor housing. In the motor housing, a motor shaft is rotatably mounted.

The transmission actuator further has an electronics housing arranged on the front side, wherein a tubular or bottle-neck-like housing extension is provided on the (first) front side opposite the electronics housing, in particular on the A side. In other words, the axial housing extension is integrally formed on a housing bottom of the approximately pole-pot-like motor housing.

In the assembled state, the transmission actuator is fastened to a transmission housing of the motor vehicle transmission in the region of the first end side or A side. For this purpose, the Housing extension plugged into a separate, in particular attached to the transmission housing or fastened, mounting flange in the manner of a press fit. As a result, a particularly suitable transmission actuator is realized, which allows a reliable and low-cost attachment to a transmission housing.

In a preferred embodiment, the motor housing on one of the housing extension opposite the second end face, in particular B-side, a peripherally projecting flange for mounting the electronics housing. As a result, a particularly suitable transmission actuator is realized, which allows a reliable attachment to an electronics housing and to a transmission housing.

For mounting the transmission actuator, the fastening flange, which is designed, for example, as a flange plate, is preferably first attached to the transmission housing of the motor vehicle transmission. Subsequently, the motor housing is inserted or pressed with the electronics housing attached thereto by means of the housing extension in the mounting flange. As a result, a particularly simple and low-effort installation of the transmission actuator is possible, which is advantageously transferred to the manufacturing and / or assembly costs of a motor vehicle transmission provided therewith.

In the assembled state, the motor shaft projects at least partially through the housing extension and the fastening flange, wherein the output-side shaft ends preferably projects beyond the fastening flange and is provided with a shaft journal as drive-technical interface (tooth interface).

In the particular brushless electric motor (brushless DC motor, BLDC motor) the wear-prone brush elements of a rigid (mechanical) commutator are replaced by an electronic commutation of the motor current. The electric motor has a stator with a rotating electrical field winding in the form of individual (stator) coils or coil windings, which are respectively assigned to individual (motor) strings or (motor) phases and interconnected in a predetermined manner.

In one possible embodiment, the electric motor is designed as a three-phase three-phase machine. In this case, the stator has three phases and thus at least three phase conductors or phase windings, which are each supplied in phase with electrical current in order to generate a magnetic rotating field in which a usually provided with permanent magnets and coupled to the motor shaft rotor or rotor rotates. The phase ends of the phase windings are led to drive the electric motor to a motor electronics arranged in the electronics housing (motor control). The motor electronics suitably has an inverter, with which the three-phase motor current is generated to energize the phase windings.

In a suitable development, the approximately tube-like or hollow-cylindrical housing extension is held radially positively and non-positively in the mounting flange. The radially acting (pressing) forces ensure that the housing extension - and thus the motor housing - is centered essentially automatically with respect to the mounting flange in the course of the press-fit operation for producing the press fit. In other words, this improves the manufacturing or joining accuracy of the motor housing with the mounting flange. Furthermore, an improved centering of the transmission actuator on a transmission housing is thus made possible.

In an expedient embodiment, the mounting flange has a flange collar resting on the motor housing and in the assembled state on the gear housing, as well as a tubular extension which preferably extends at least partially into the gear housing and which is open in the region of the first end face. The flange extension is designed here for receiving the housing extension of the motor housing for the press fit. By the flange collar on the one hand the highest possible stability and reliable attachment to the gear housing is realized. On the other hand, the flange extension of the mounting flange, which is substantially coaxial with the housing extension of the motor housing, improves the mutually centered alignment of the motor housing with the mounting flange in the course of the press-fit fastening.

In a particularly stable design of the mounting flange with the motor housing, in particular with the housing extension, joined, preferably enforced. In a clinching operation, such as clinching or poisoning, a substantially non-releasable connection is made by means of a local cold forming between the motor housing and the mounting flange. As a result, an edge and a level fastening is realized. Preferably, the motor housing and the mounting flange are provided with a protective coating to improve the corrosion resistance, which is suitably preserved in the course of clinching.

The interference fit of the tube-like housing extension with the mounting flange on the one hand, and the subsequent enforce joining on the other hand, for example, allow the use of a galvanized slit strip for the mounting flange. This allows sufficient strength and service life while avoiding corrosion problems. Additionally or alternatively, it is conceivable, for example, that the mounting flange attached to the end face of the motor housing, in particular vertoxt is.

In a conceivable embodiment, the mounting flange, in particular the flange extension, in the region of the first end side has a bearing seat for a first rolling bearing of the motor shaft. The bearing seat is in this case arranged in particular on a side facing away from the motor housing end of the flange extension. As a result, a suitable mounting of the motor shaft is realized. The bearing seat is, for example, integrally formed on the front side of the opening of the flange extension. In a further possible embodiment of the bearing seat is disposed within the flange extension. For example, it is conceivable that the bearing seat is formed by the end face of the single-seat housing extension. In other words, the rolling bearing sits on the one hand in the Flanschverlängerung and on the other hand is axially on the housing extension. Alternatively, it is also conceivable, for example, that the bearing seat is introduced into the housing extension of the motor housing.

By the first roller bearing a particularly accurate alignment and centering of the motor shaft during assembly is possible, so that in a conceivable installation situation, a high accuracy in the toothing (concentricity) of the motor shaft or the shaft journal is ensured with a gear. In other words, a high concentricity at a tooth interface of the transmission actuator is possible because the transmission is arranged substantially directly next to the first rolling bearing.

In a suitable development, a bearing plate with a bearing seat for a second rolling bearing of the motor shaft is arranged between the motor housing and the electronics housing. As a result, a centered alignment and mounting of the motor shaft in the motor housing by means of the transmission-side first rolling bearing on the one hand and by means of the electronics side second rolling bearing on the other hand guaranteed. The bearings are hereby suitably designed as a ball bearing with an inner ring resting against the motor shaft and an outer ring captive in the respective bearing seat.

In a preferred embodiment, the electronics-side end shield is axially retracted in the region of the bearing seat, that means deep-drawn in the direction of the first end face. As a result, a particularly compact and space-reduced arrangement of the second rolling bearing is realized. The second rolling bearing of the bearing plate is in this case designed, for example, as a fixed bearing, wherein the first roller bearing of the mounting flange is designed in particular as a floating bearing.

Another or further aspect of the invention provides that the outer peripheral side of the mounting flange, a first sealing ring is provided for sealing against the gear housing in the assembled state. By the first sealing ring of the gear actuator is sealed in the assembled state fluid-tight against the gear housing. In other words, thus the interface between the electric motor and the motor vehicle transmission is sealed against ingress of water or moisture.

In a suitable development, the motor housing and the mounting flange are sealed against each other by means of a second sealing ring. For cooling the electric motor, the motor housing in the assembled state is preferably arranged at least partially within an oil sump of the motor vehicle transmission. By the second sealing ring, the interior of the electric motor, in particular the stator or rotating field winding, reliably sealed against penetration of (gear, hydraulic) oil. For this purpose, a circular widening or an offset is suitably introduced as a sealing seat for the second sealing ring in the flange extension. The second sealing ring continues to generate a radial contact pressure (sealing force) on the outer circumference of the housing extension during the production of the press fit, so that the sealing force necessary for sealing acts to support the centering of the motor housing and the fastening flange.

For the purpose of a reliable and reliable attachment of the motor housing to the electronics housing is provided that the integrally formed on the second end face flange of the motor housing is at least partially clamp-like, in particular C-shaped, inflected. In particular, behind or surrounds the bent flange in this case a corresponding holding or undercut contour of the electronics housing, so that a positive and / or non-positive retention of the electronics housing is realized on the motor housing.

• 1 in einer perspektivischen Schnittdarstellung ausschnittsweise einen an einem Getriebegehäuse montierten Getriebeaktuator,
• 2 in Perspektive ein zweites Ausführungsbeispiel des Getriebeaktuators,
• 3 in Draufsicht den Getriebeaktutor,
• 4 in Seitenansicht den Getriebeaktuator, und
• 5 in Schnittdarstellung gemäß der 4 den Getriebeaktuator.

Embodiments of the invention are explained in more detail with reference to a drawing. Show:

• 1 in a perspective sectional view of a detail of a gearbox mounted on a transmission actuator,
• 2 in perspective a second embodiment of the transmission actuator,
• 3 in plan view the gear actuator,
• 4 in side view the transmission actuator, and
• 5 in sectional view according to the 4 the transmission actuator.

In the 1 is a transmission actuator 2 a motor vehicle, in particular a motor vehicle transmission shown. The transmission actuator 2 includes a brushless electric motor 4 with an approximately pole-like motor housing 6 , Recognizable interspersed in the axial direction A running motor shaft 8th on which a shaft-fixed rotor 10 sits, a stator 12 , The stator 12 concentrically surrounds the rotor 10 , The rotor 10 is in the assembled state inside the stationary stator 12 around the motor shaft 6 rotatably mounted.

The stator 12 includes a stator lamination stack 14 with a number of radially inwardly directed stator teeth. On the teeth of the laminated stator core 14 is a rotating field winding in the form of interconnected individual coils 16 applied. The single coils 16 are interconnected by means of their respective coil ends to a number of phases, which are acted upon by a non-illustrated engine electronics in operation with a multi-phase AC current.

The engine electronics are in an electronics housing 18 arranged, which at a B-side end face 20 of the motor housing 6 is attached. The motor shaft 8th protrudes at least partially into the electronics housing 18 in this case has wave end side a ring magnet 22 as encoder system for determining and detecting the rotor position. The engine electronics of the electronics housing 18 is in the assembled state for the supply of electrical energy by means of a connection 24 connected to a wiring harness of the motor vehicle.

Between the motor housing 6 and the electronics housing 18 is a the motor housing 6 covering bearing cap or a bearing plate 26 arranged. The bearing plate 26 has a central, deep-drawn bearing seat 28 for a rolling bearing 30 on.

For fastening the electronics housing 18 on the motor housing 6 has the motor housing 6 at the front 20 a flange 32 on, which is circumferentially formed overhanging. The flange 32 is for mounting the electronics housing 18 at least partially inflected. In particular, the flange 32 partially inflected about C-shaped, wherein the flange 32 thus an approximately U-shaped retaining contour 34 of the electronics housing 18 clasped or embraces.

The transmission actuator 2 is in the assembled state A on the side of a gearbox 36 attached to the motor vehicle transmission. For this purpose, a mounting flange 38 on the transmission housing 36 fastened, in which the motor housing 6 on one of the front side 20 opposite arranged front side 40 is plugged in the manner of a press fit.

The mounting flange 38 has an approximately plate-like flange collar 42 on, on the one hand on the front side 40 of the motor housing 6 and on the other hand to the transmission housing 36 is applied. At the flange collar 42 is a tubular flange extension 44 molded, which at least partially in the transmission housing 36 intervenes. The approximately cylindrical flange extension 44 has a central (shaft) opening through which the motor shaft 8th protrudes.

The motor housing 6 points at the front 40 a tube or bottle neck-like housing extension 46 on which coaxial with the flange extension 44 is oriented. Like in the 1 clearly recognizable, is the housing extension 46 in the flange extension 44 Pressed and held radially positive and non-positive. To improve the axial and radial attachment, it is conceivable in an alternative embodiment, for example, that the mounting flange 38 with the motor housing 6 is mechanically firmly connected by clinching.

The flange extension 44 points in the area of the flange collar 42 a cross-sectionally approximately stepped offset 48 on. By the offset 48 is between the flange extension 44 and the single-seat housing extension 46 an approximately annular space as a seal seat for a sealing ring 50 formed, which the housing extension 46 opposite the flange extension 44 seals. Outside at the offset 48 is a second sealing ring 52 arranged, which the flange extension 44 opposite the gearbox 36 seals. This causes the gearbox 36 on the one hand and the motor housing 6 on the other hand sealed fluid-tight.

At the flange collar 42 opposite end of the flange extension 44 a second offset is formed by which a bearing seat 54 for an A-side roller bearing 56 is trained. The motor shaft 8th is thus with the two rolling bearings 30 and 56 centered in the gearbox actuator 2 stored. On the A-side shaft end of the motor shaft 8th is a shaft journal 58 provided as a drive interface.

Based on 2 to 5 Below is a second embodiment of the Getriebeaktuators 2 explained.

In this embodiment, the motor housing 6 of the transmission actuator 2 at the front 20 a flange 32 on, which in this embodiment as four circumferentially cantilever flanges 32 is executed. The flannel bags 32 are even along the circumference of the motor housing 6 arranged distributed. The electronics housing 18 here has four corresponding flanged flanges 60 which in the assembled state axially aligned over the flanged lugs 32 of the motor housing 6 are arranged. The flannel bags 60 and 32 in each case have lead-through openings 62 on, by means of which a screw fastening the electronics housing 18 on the motor housing 6 is possible.

As in particular in the 3 can be seen, the electronics housing 18 a substantially circular circumference, at which motor side the flanged lugs 60 are formed. The connection 24 is here at the the electric motor 4 opposite end face 64 arranged axially upstanding.

The mounting flange 32 has in this embodiment an approximately elliptical flange collar 42 on, whose diametrically opposite, tapered apex are formed as flanged lugs. The flannel bags 42 each have a circular recess 66 on, by means of which the mounting flange 32 on the gearbox 36 can be screwed.

As in particular in the side view of 4 and the sectional view of 5 can be seen, the flange extension 44 in this embodiment, no frontal offset as a bearing seat 54 for the rolling bearing 56 on. The bearing seat for the rolling bearing 56 is here essentially by the inner circumference of the flange extension 44 and the end face of the male housing extension 46 educated.

The invention is not limited to the embodiments described above. Rather, other variants of the invention can be derived therefrom 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 other ways, without departing from the subject matter of the invention.

LIST OF REFERENCE NUMBERS

2

transmission operator

4

electric motor

6

motor housing

8th

motor shaft

10

rotor

12

stator

14

stator lamination

16

Single coil

18

electronics housing

20

front

22

ring magnet

24

connection

26

end shield

28

bearing seat

30

roller bearing

32

Flange / flange tab

34

retaining contour

36

gearbox

38

mounting flange

40

front

42

Flange collar / flange tab

44

flange extension

46

housing extension

48

offset

50

sealing ring

52

sealing ring

54

bearing seat

56

camp

58

shaft journal

60

flange tab

62

Through opening

64

face

66

recess

A

axially

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been 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.

Cited patent literature

• DE 102014223804 A1 [0006]
• DE 2012222602 A1 [0007]

Claims (11)

Transmission actuator (2) for a motor vehicle, having a, in particular brushless, electric motor (4) with a pole pot-like motor housing (6) open at both end faces (20, 40) and a motor shaft (8) mounted therein, and with an electronics housing (18) . - Wherein the motor housing (6) at a first end face (40) has a tubular housing extension (46), and - Wherein the housing extension (46) for attachment to a transmission housing (36) in a separate, in particular with the transmission housing (36) attached or attachable, mounting flange (38) is plugged in the manner of a press fit. Transmission actuator (2) after Claim 1 , characterized in that the motor housing (6) on one of the housing extension (46) opposite the second end face (20) has a peripherally projecting flange (32) for fastening the electronics housing (18), Transmission actuator (2) after Claim 1 or 2 , characterized in that the housing extension (46) in the mounting flange (38) is held radially positive and non-positive. Transmission actuator (2) according to one of Claims 1 to 3 , characterized in that the mounting flange (38) on the motor housing (6) and in the assembled state on the transmission housing (36) adjacent the flange collar (42) and a tubular and in the region of the first end face (40) open flange extension (44) for receiving the housing extension (46) of the motor housing (6). Transmission actuator (2) according to one of Claims 1 to 4 , characterized in that the fastening flange (38) with the motor housing (6), in particular with the housing extension (46), joined, preferably enforced, is. Transmission actuator (2) according to one of Claims 1 to 5 , characterized in that the mounting flange (38), in particular the Flanschverlängerung (44), in the region of the first end face (40) has a bearing seat (54) for a first roller bearing (56) of the motor shaft (8). Transmission actuator (2) according to one of Claims 1 to 6 , characterized in that between the motor housing (6) and the electronics housing (18) has a bearing plate (26) with a bearing seat (28) for a second rolling bearing (30) of the motor shaft (8) is arranged. Transmission actuator (2) after Claim 7 , characterized in that the electronics side bearing plate (26) in the region of the bearing seat (28) is axially retracted. Transmission actuator (2) according to one of Claims 1 to 8th , characterized in that the outer peripheral side on the mounting flange (38), a first sealing ring (52) is provided for sealing against the gear housing (36) in the assembled state. Transmission actuator (2) according to one of Claims 1 to 9 , characterized in that the motor housing (6) and the mounting flange (38) by means of a second sealing ring (50) are sealed from each other. Transmission actuator (2) according to one of Claims 1 to 10 , characterized in that the flange (32) of the motor housing (6) for attachment to the electronics housing (18) at least partially clip-like, in particular C-shaped, is inflected.

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