Housing of an electric drive

Abstract

The invention relates to a housing (10) of an electric drive, with a stator (29) and a rotor of an E-axle module for an electrically driven vehicle, a cooling channel (56) being flowed through by a cooling medium. The cooling channel (56) is formed on the one hand by a first channel geometry (16) on the inner side (13) of a sleeve-shaped attachment (11) of the housing (10) and on the other hand by a second channel geometry (24) embodied on a jacket (54) of a sleeve (28).

Description

TECHNICAL FIELD

[0001] The invention relates to a housing for an electric drive, having at least one rotor and stator for an E-axle module for electrically driving a vehicle, a cooling channel extending in the housing, through which a cooling medium flows. Furthermore, the invention relates to the use of the housing in an E-axle module for electrically driving a vehicle. BACKGROUND

[0002] DE 10 2015 205 783 A1 relates to a cooling jacket device for accommodating an electric motor, an electric drive having the cooling jacket device and a method for producing the cooling jacket device and / or the electric drive. In addition to the drive torque, the electric motor generates waste heat due to power losses, which causes the electric motor to heat up during operation. Therefore, a cooling jacket device for accommodating an electric motor is proposed for cooling the electric motor, which has an inner jacket section and an outer jacket section, wherein the outer jacket section has an abutment region and a guide region, wherein the abutment region abuts on the inner jacket section and the guide region is spaced apart from the inner jacket section, so that a fluid guide structure for guiding a fluid is formed between the inner jacket section and the outer jacket section. The guide region and / or the abutment region is configured as a shaped region in the outer jacket section, wherein the shaped region is introduced into the outer jacket section by a tool.

[0003] DE 10 2009 001 387 A1 relates to an electric machine. The electric machine is provided in particular for a motor vehicle and comprises a housing, a shaft having a shaft axis, a stator and a rotor. At least one channel for guiding a cooling fluid for cooling the electric machine is provided, wherein the geometry or the orientation of at least one section of the at least one channel is configured such that the cooling fluid flows through the at least one channel with a deviation of less than 40°, in particular only in the direction of the shaft axis of the shaft.

[0004] DE 10 2015 212 442 A1 relates to a cooling jacket device for an electric motor and an electric drive having the cooling jacket device. A cooling jacket device for an electric motor is proposed, which has a cooling jacket for accommodating the electric motor, wherein the cooling jacket is arranged around a main axis and has a cooling channel region for guiding a cooling fluid. A first deflection device is arranged on a first axial side of the cooling jacket, wherein the first deflection device forms a first deflection region for deflecting the cooling fluid and has a first plug-in section. The first plug-in section is moved into the cooling channel region in an axial direction with respect to the main axis, so that the first deflection region is in a flow-technological connection with the cooling channel region by the plug-in section.

[0005] DE 10 2017 211 317 A1 relates to a stator of an electric machine and a cooling device thereof. The stator of an electric machine, in particular of an electromechanical drive machine for an electric or hybrid vehicle, has a stator lamination stack with a stator yoke and a plurality of radially oriented stator teeth, and a corresponding number of stator slots arranged between the stator teeth for accommodating stator windings. A cooling device with a certain number of cooling channels is provided, which are respectively arranged axially in one of the stator slots. SUMMARY

[0006] According to the application, a housing of an electric drive with at least one rotor and stator of an E-axis module for an electrically driven vehicle is proposed, wherein the housing has a cooling channel extending therein, through which a cooling medium flows. According to the application, the cooling channel is formed on the one hand by a first channel geometry embodied on the inner side of a sleeve-shaped attachment of the housing and on the other hand by a second channel geometry configured on a jacket of the sleeve.

[0007] By the solution according to the application, complex, expensive and time-consuming machining of the housing for accommodating the stator of the electric machine can be avoided in a particularly advantageous manner with regard to the manufacturing technology. The cooling channel geometry can be cast into the housing on the one hand in the case of manufacturing the housing and on the other hand can be manufactured as a second channel geometry in a complementary manner on the outer jacket of the sleeve in the case of manufacturing the sleeve which can be moved into the housing, likewise in a cast shaping method.

[0008] In an expanded solution according to the application, the channel geometry on the inner side of the sleeve-shaped attachment and the channel geometry on the outer side of the sleeve can be represented by ribs, in particular by radial ribs. In the case of the housing according to the application, the sleeve and the inner side of the sleeve-shaped attachment form a pull-out bevel which significantly simplifies the installation in an advantageous manner. This simplifies the installation of the sleeve in the sleeve-shaped attachment of the housing in the axial direction.

[0009] The pull-out bevel is provided in an advantageous manner such that it extends in the axial direction from an A bearing region to a B bearing region, wherein a smaller diameter is produced in the A bearing region by the pull-out bevel than the diameter which the sleeve-shaped attachment has in the B bearing region. In the case of the housing according to the application, the two mutually complementarily configured channel geometries each have an arcuately configured deflection which enables a deflection of the cooling medium through the cooling channel. This in turn advantageously contributes to the dissipation of the heat losses which are formed during the operation of the electric machine.

[0010] In the case of the housing according to the application, the cooling channels formed by the first and second channel geometries are essentially configured in the shape of a labyrinth. The labyrinth shape provides in an advantageous manner a clear prolongation of the cooling fluid flow, which thus extracts the maximum heat loss when passing through all the interconnected cooling channels, and ensures effective cooling of the electric machine.

[0011] In the case of the housing according to the application, the grooves are implemented, for example cast, in the first channel geometry, the radial ribs of the second channel geometry moving into the grooves in the case of mounting of the sleeve essentially in the axial direction.

[0012] On the other hand, the grooves can also be implemented, in particular cast, in the second channel geometry, the radial ribs of the first channel geometry moving into these grooves in the case of mounting of the sleeve essentially in the axial direction. The grooves provide in an advantageous manner an accommodation area for the respective end of the ribs, which are implemented in particular as radial ribs, forming a sealing point when mounting the sleeve in the sleeve-shaped attachment of the housing, and effectively inhibiting a short-circuit axis of the cooling medium flow by moving the head of the ribs into the respective groove, and forcing the cooling fluid flow through the cooling channels.

[0013] In the case of the housing according to the application, the grooves extend essentially in the axial direction, the grooves being implemented on the inside of the sleeve-shaped attachment on the one hand, and on the sheath of the sleeve on the other hand.

[0014] In the case of the housing according to the application, the sleeve on the sleeve-shaped attachment is sealed in the B-bearing area with an axial seal and a radial seal, and in the A-bearing area with at least one radial seal.

[0015] The application also relates to the use of the housing in a transmission for an electric drive of an E-axle module for an electrically driven vehicle.

[0016] By the solution according to the application, complex cutting manufacture of the cooling channels in the housing for accommodating the electric drive can be avoided in an advantageous manner in terms of manufacturing technology. Instead, the solution according to the application enables the channel geometries to be shaped by a casting shaping method not only on the inside of the housing, but also on the peripheral side of the component to be spliced with the housing, in particular the sleeve. The channel geometries define a specific course of the cooling channels and in turn of the cooling medium flow through the housing or housing part. By predefining the course of the cooling channels, the waste heat transfer of the heat loss of the electric machine can be adjusted in a defined manner.

[0017] In a particularly simple and inexpensive method in terms of manufacturing technology, during the manufacture of the channel geometry, in particular radial ribs can be produced which, on the one hand, enable simple demolding and, on the other hand, form a cooling channel structure with very good sealing properties. If grooves are, for example, cast into the channel geometry (with the head or radius of the complementarily configured radial ribs embedded in the grooves), the individual cooling channels can be sealed from one another by the corresponding formation of walls, without the need for additional sealing elements. In an advantageous manner, short-circuiting of the cooling medium flow can thus be avoided, ensuring effective cooling and, in particular, a continuous flow-through of the cooling medium. In the solution according to the application, the inlet and outlet can be implemented, for example, on a sleeve to be inserted into the housing. In order to simplify the installation, not only the inner side of the housing, on which the first channel geometry of the cooling channels is configured, but also the peripheral side of the sleeve to be spliced into the housing in the axial direction has a pull-out bevel in the second channel geometry. This significantly simplifies the installation, which is carried out essentially in the axial direction, so that no further machining steps are required.

[0018] Due to the pressing of the stator into the common housing, intrinsic stresses are formed by the covering. The intrinsic stresses have an effect on the shape and position tolerances of the common housing. The sealing possibility of the cooling channels not only in the radial direction but also in the axial direction is achieved by the solution according to the application of the common housing. In the case of the axial sealing, the groove of the O-ring is cast on the respective housing half on the end side. Depending on the bending of the common housing, this can have a number of sealing variants, which are adapted to the resulting shape and position tolerances. BRIEF DESCRIPTION OF DRAWINGS

[0019] The application is subsequently described in more detail according to the drawings. Therein:

[0020] Figure 1 A perspective view of the housing and the first channel geometry configured on the inner side thereof is shown;

[0021] Figure 2 A sleeve which can be moved into the housing according to the application in the axial direction is shown in a longitudinal sectional view; Figure 1

[0022] Figure 3 A perspective view of the sleeve and the second channel geometry configured on the jacket thereof is shown;

[0023] Figure 4 A depiction of the pull-out bevel between the sleeve-shaped accessory according to the application and the sleeve according to the application is shown; Figure 1 Figure 3

[0024] Figure 5 A sectional view through the device spliced together by the sleeve-shaped accessory and the sleeve spliced therein is shown; ​​​

[0025] Figure 6 A diagram showing the geometry of the first and second channels spliced ​​together is provided.

[0026] Figure 7 An illustration shows a deflection section constructed within the first channel geometry in a sleeve-shaped attachment;

[0027] Figure 8 A diagram of the seal on the bearing side A is shown;

[0028] Figure 8.1 and 8.2 The axial and radial seals in bearing region B are shown;

[0029] Figure 9 A perspective view of the sleeve with a coolant inlet and a coolant outlet is shown;

[0030] Figure 10 It shows that it is basically corresponding to Figure 6 The illustration shows a first channel geometry and a second channel geometry in the installed state of the sleeve, with radial ribs or casting grooves interlocked with each other.

[0031] Figure 11 A detailed illustration of short-circuit flow is shown;

[0032] Figure 12 The flow path of the cooling medium is shown in an example of a second channel geometry on the circumferential side of the sleeve; and

[0033] Figure 13 A cross-sectional view is shown through the sleeve-shaped accessory and the sleeve installed therein, together with the stator of the motor. Detailed Implementation

[0034] In the following description of embodiments of the invention, the same or similar elements are designated by the same reference numerals, wherein repeated descriptions of these elements are omitted in certain cases. The accompanying drawings are merely schematic illustrations of the subject matter of the invention.

[0035] From the basis Figure 1 The illustration provides a three-dimensional view of the housing 10, on which a cylindrical, sleeve-shaped accessory 11 is mounted. Inside the sleeve-shaped accessory 11 is a bearing region A 12, and at the open end of the sleeve-shaped accessory 11 is a bearing region B 14. Figure 4 The stator 29 shown is rotatably supported in bearing region 12 (A) and bearing region 14 (B), with the stator positioned for better visibility. Figure 1 The middle part is omitted. The inner side 13 of the sleeve-shaped accessory 11 is provided with a first channel geometry 16. According to... Figure 1The first channel geometry 16 is provided such that it has individual radially extending ribs 26 between which there is cast a groove 42 which extends essentially in axial direction with respect to the sleeve-shaped attachment 11. Preferably, the sleeve-shaped attachment 11 is manufactured as a casting in order to avoid a complex and expensive machining of the inner side 13 of the sleeve-shaped attachment 11 by means of a cutting method and instead to establish the first channel geometry 16 on the inner side 13 of the sleeve-shaped attachment 11 by means of a forming method, for example casting.

[0036] It results from the illustration according to Figure 1 that in the area of the first channel geometry 16 on the inner side 13 of the sleeve-shaped attachment 11 there are individual cooling channel sections which are flowed through by the cooling medium which are separated from one another by means of the radial ribs 26. On the end of the respective radial rib 26 there is an arc-shaped deflection 18. Between the individual radially extending radial ribs 26 on the inner side 13 of the sleeve-shaped attachment 11 there is a groove 42 which extends essentially in axial direction which is preferably cast into the inner side 13 of the sleeve-shaped attachment 11. Figure 2 A longitudinal sectional view through the sleeve 28 is shown which is provided with a second channel geometry 24 on its jacket 54. In Figure 2 the sleeve 28 which is shown in a longitudinal sectional view in Figure 2 the inner surface of the sleeve 28 which is shown in a longitudinal sectional view in

[0037] Figure 3 The sleeve 28 is shown uncut in a perspective view. It results from the perspective view according to Figure 3 that the sleeve 28 is provided with a second channel geometry 24 on its jacket 54. The second channel geometry 24 is configured complementary to the first channel geometry 16 according to the illustration in Figure 1 . If the sleeve 28 according to the illustration in Figure 3 is moved into the interior of the sleeve-shaped attachment 11, then a cooling channel 56 is formed between the first channel geometry 16 on the inner side 13 of the sleeve-shaped attachment 11 on the one hand and the second channel geometry 24 on the jacket 54 of the sleeve 28 on the other hand. It results from Figure 3It is provided that, likewise between the individual sections of the second channel geometry 24, grooves 43 are provided, which are preferably cast into the peripheral side 54. The second channel geometry 24 on the jacket 54 of the sleeve 28 likewise has radial ribs 44, analogously to the radial ribs 26 of the first channel geometry 16. As will be described later, when the sleeve 28 is mounted in the axial direction in the sleeve-shaped attachment 11, the radial ribs 44 of the second channel geometry 24 are moved into the grooves 42 of the first channel geometry 16 on the inner side 13; in addition, the radial ribs 26 embodied on the inner side 13 of the sleeve-shaped attachment 11 are moved into the grooves 43 of the second channel geometry 24, so that, when the sleeve 28 is mounted in the sleeve-shaped attachment 11, the cooling channel 56 is formed as a cooling channel insert 22.

[0038] Figure 4 A longitudinal sectional view through the sleeve-shaped attachment 11 is shown, into which the sleeve 28 is moved. As is apparent from the sectional view according to Figure 4 , between the sleeve-shaped attachment 11 and the sleeve 28, a pull-out ramp 20 is provided, which enables the axial mounting or removal of the sleeve 28. On the open end, the sleeve 28 has a ring 30; the sleeve 28 furthermore surrounds a stator 29 of the electric machine, which is not shown in detail here. The pull-out ramp 20 is defined in such a way that it has a smaller diameter in the A bearing region 12 than the diameter of the sleeve 28 in the B bearing region 14. By means of the diameter difference, a substantially conically extending pull-out ramp 20 is formed.

[0039] Figure 5 A top view is shown of the sleeve-shaped attachment 11, of the first channel geometry 16 provided on the inner side 13 thereof, of the sleeve 28 according to Figure 3 , moved into the sleeve-shaped attachment 11, and of the stator 29 of the electric machine.

[0040] Figure 6 It is shown that the sleeve 28, with the second channel geometry 24, is moved into the first channel geometry 16 on the inner side 13 of the sleeve-shaped attachment 11. As is apparent from the Figure 6 , in the mounted state of the sleeve 28, its radial ribs 44 are moved into the corresponding grooves 42 of the first channel geometry 16. The same applies to the radial ribs 26 on the inner side of the first channel geometry 16.

[0041] From Figure 7 , the following detail of the first channel geometry 16 is apparent: by means of the radial ribs 26, individual cooling channel sections are formed, which are each delimited by a deflection 18 in the A bearing region 12. The deflection 18 re-directs the cooling medium flow to the opposite side, respectively.

[0042] From Figure 8 , 8.1A sealing point can be seen, which occurs in the spliced state of the sleeve 28 and the sleeve-shaped attachment 11, at 8.2. Figure 8 It is shown that the sleeve 28, which encloses the stator 29 shown schematically in Figure 8 , is moved into the sleeve-shaped attachment 11 of the housing 10. The moving-in operation is simplified by pulling out the bevel 20. The sleeve 28 comprises the ring 30 already mentioned several times. A radial seal 32, which is located in the A bearing region 12, seals at this point. From Figure 8.1 and 8.2 it can be seen that an axial seal 34 or a radial seal 36 is provided in the B bearing region 14, respectively shown by means of an O-ring. In both figures, i.e. in Figure 8.1 and 8.2 , the sleeve 28 with the ring 30 is moved into the sleeve-shaped attachment 11, so that the structure of the cooling channel 56 resulting from the two channel geometries 16, 24 is created.

[0043] Figure 9 The sleeve 28 is shown in a schematic manner, in a perspective view. There is an inlet 38 for a cooling medium on the upper side of the ring 30; adjacent thereto, an outlet 40 is shown, on which the cooling medium exits the cooling channel 56 heated after passing through the cooling channel 56. As Figure 9 is shown, the second channel geometry 24 is configured on the jacket 54 of the sleeve 28, which, in addition to the radial ribs 44, comprises slots 43 of the second channel geometry 24, which extend in the axial direction.

[0044] From the illustration according to Figure 10 , it can be seen that the second channel geometry 24 on the peripheral side 54 of the sleeve 28 is embedded in the first channel geometry 16 on the inner side 13 of the sleeve-shaped attachment 11. From the illustration according to Figure 10 , it results that not only the radial ribs 44 of the second channel geometry 24 are embedded in the slots 42 of the first channel geometry 16, but also the radial ribs 26 of the first channel geometry 16 on the inner side 13 of the sleeve-shaped attachment 11 are embedded in the corresponding slots 43 of the second channel geometry 24. It is thus ensured that the individual flow channel sections for the cooling fluid remain separated from one another and a short-circuit flow 46 as shown in Figure 11 is not possible. A sealing point 48 has been provided in the region of the cooling channel 56, so that, as shown in Figure 11 , the radial ribs 44 of the second channel geometry 24 are embedded in the corresponding slots 42 of the first channel geometry 16. Thus, a short-circuit flow 46 between the two channel sections of the cooling channel 56 is effectively prohibited.

[0045] From Figure 12It can be seen that the cooling medium flows through the inlet 38 into the cooling channel 56 and overflows from the B-bearing area 14 into the A-bearing area 12. After passing through the deflecting portion 18, which is not shown in Figure 12 but is illustrated in accordance with the drawing of Figure 1 , the guided cooling medium 52 is guided from the A-bearing area 12 back into the B-bearing area 14. The cooling channel 56 has an overall meander shape 58, i.e. in the case of the interfitting of the first channel geometry 16 and the second channel geometry 24. The meander shape 58 is configured between the sleeve 28 and the sleeve-shaped appendix 11, which provides an elongation of the flow path for the cooling medium, so that the maximum removal of the thermal losses of the electric machine can be achieved by the solution according to the application.

[0046] Figure 13 It is shown that the sleeve 28 together with the ring 30 is moved into the sleeve-shaped appendix 11 of the housing 10 along the pull-out bevel 20. From Figure 13 the tapering of the pull-out bevel 20 can be seen. The cooling channel 56 is formed in such a way that the sleeve 28 is moved into the sleeve-shaped appendix 11 having the first channel geometry 16 configured on the inner side 13. On its peripheral side 54, there is the second channel geometry 24, which together with the first channel geometry 16 forms the course and the sealing of the cooling channel 56 in the housing 10.

[0047] The application is not limited to the embodiments described herein and the aspects emphasized therein. Rather, numerous modifications are possible in the scope of the claims explained by the description.

Claims

1. A housing (10) of an electric actuator having a stator (29) and a rotor for an E-axis module of an electrically driven vehicle, the housing having cooling channels (56) extending within the housing (10) through which a cooling medium flows, characterized in that, The cooling channel (56) is formed on the one hand by a first channel geometry (16) implemented on the inner side (13) of the sleeve-shaped attachment (11) of the housing (10), and on the other hand by a second channel geometry (24) constructed on the sheath (54) of the sleeve (28), wherein the sleeve (28) has a surrounding ring (30) at the open end, wherein the ring (30) has a stepped structure, thereby the sleeve (28) is sealed in the sleeve-shaped attachment (11) in the B bearing region (14) by means of axial seals and radial seals, wherein the B bearing region (14) is located at the open end of the sleeve-shaped attachment (11).

2. The housing (10) according to claim 1, characterized in that, The channel geometry (16, 24) on the sleeve-shaped attachment (11) and sleeve (28) is shown by ribs (26, 44).

3. The housing (10) according to claim 2, characterized in that, The channel geometry (16, 24) on the sleeve-shaped attachment (11) and sleeve (28) is shown by radial ribs.

4. The housing (10) according to any one of claims 1 to 3, characterized in that, The inner side (13) of the sleeve (28) and the sleeve-shaped accessory (11) has a pull-out inclined part (20).

5. The housing (10) according to claim 4, characterized in that, The pull-out inclined portion (20) extends axially from bearing region A (12) to bearing region B (14).

6. The housing (10) according to any one of claims 1 to 3, characterized in that, The channel geometry (16, 24) has deflection sections (18, 50) with arc-shaped structures for deflecting the cooling medium.

7. The housing (10) according to any one of claims 1 to 3, characterized in that, The cooling channel (56), which is composed of the first channel geometry (16) and the second channel geometry (24), extends in a meander shape (58).

8. The housing (10) according to any one of claims 1 to 3, characterized in that, A groove (42) is implemented in the first channel geometry (16), and the radial rib (44) of the second channel geometry (24) moves into the groove when the sleeve (28) is installed.

9. The housing (10) according to any one of claims 1 to 3, characterized in that, A groove (43) is implemented in the second channel geometry (24), and the radial rib (26) of the first channel geometry (16) moves into the groove with the sleeve (28) installed.

10. The housing (10) according to claim 8, characterized in that, The grooves (42, 43) on the inner side (13) of the sleeve-shaped accessory (11) and on the sheath (54) of the sleeve (28) extend substantially in the axial direction.

11. The housing (10) according to any one of claims 1 to 3, characterized in that, The sleeve (28) is sealed in the bearing region (12) of bearing A using at least one radial seal (32).

12. Use of the housing (10) according to any one of the preceding claims in a transmission of an electric drive in an electric vehicle.

Images