DE102014221204B4 - Hybrid module and method of manufacturing a hybrid module for a vehicle - Google Patents

Abstract

Hybrid module (1) for a vehicle, wherein the hybrid module (1) between an internal combustion engine (10) and a transmission (100) is arranged, comprising an electric drive (3), wherein a stator (5) comprises a rotor assembly (7) is provided in a rotor space (6), enclosing and having a plurality of bobbins (41), wherein each bobbin (41) has a pipe section (38) with an inner flange (40) through which a plurality of coil heads (39) of the stator (40). 5), and a carrier element (13) which has a flange section (15) and a cooling jacket (17), wherein the flange section (15) supports the rotor assembly (7) and the cooling jacket (17) is mounted on an outer jacket surface (19 ) of the stator (5), and wherein at least one heat conduction member (21, 23) is disposed on at least one side surface (S1, S2) of the flange portion (15) of the support member (13), and a first side surface (S1) of the flange portion (15) of the carrier element ( 13), which faces the electric drive (3), has at least one first heat-conducting element (21) which has formed a passive heat dissipation or an active heat dissipation, characterized in that the active heat dissipation is formed such that the at least one first heat-conducting element annular component (21) and in an axial direction (R1) in front of an end face (37) of the rotor assembly (7) is arranged and the component (21) in free spaces (11) of the hybrid module (1) between a plurality of coil ends (39) of the Stators (5) in a radial direction (R2) extending outgoing ducts (61) forms, in which a cooling medium is guided.

Description

The present invention relates to a hybrid module for a vehicle according to the features of the preamble of claim 1 or claim 2.

The present invention further relates to a manufacturing method of a hybrid module for a vehicle.

Hybrid modules of the type mentioned are known to be used in hybrid vehicles. It is in classic hybrid vehicles, as in a schematic block diagram in 1 shown, a hybrid module 1 between a high-performance combustion engine 10 and a gearbox 100 arranged with a wide range of translations.

A schematic longitudinal section through a known from the prior art hybrid module 1 shows 2 , It forms an electric drive 3 together with a vibration damper 9 and at least one separable coupling device 27 the hybrid module 1 , The vibration damper 9 is mostly a dual mass flywheel. The separable coupling device 27 is advantageously at least partially within a rotor assembly 7 of the electric drive 3 , The rotor assembly 7 coming from a stator 5 enclosed, comprises a rotor 25 and a hollow shaft portion 26 , In particular, the stator 5 coaxial and concentric with the hollow shaft section 26 the rotor assembly 7 in a housing 43 arranged. The rotor assembly 7 is about a rotation axis A (in 3 shown) rotatably in the housing 43 stored, the stator 6 is in the case 43 stationarily or stationarily positioned.

Furthermore, the hybrid module comprises a carrier element 13 that consists of a flange section 15 and a cooling jacket 17 consists. The flange section 15 stores the rotor assembly 7 , The cooling jacket 17 is on an outer lateral surface 19 of the stator 5 arranged so that the heat loss from the outer surface 19 of the stator 5 is deductible. On a radial outside, the cooling jacket 17 a plurality of extending in the direction of rotation about the axis of rotation A webs 44 on which on the inner surface of the housing 43 abut, so that between the webs 44 and thus between the cooling jacket 17 and the housing 43 cooling channels 45 are formed.

In the cooling channels 45 For example, a medium, in particular fluid, for example an oil or another coolant, can be used to cool the electric drive 3 be guided.

In some other known from the prior art embodiments, a cooling jacket with liquid cooling on the outer surface of the stator is also carried out separately from the carrier element. This is for example in the American patent US Pat. No. 5,929,543 as well as in the German Offenlegungsschrift DE 102 07 486 A1 disclosed. Alternatively or additionally, oil-cooled electric drives are known in hybrid modules, in which an oil within the hybrid module directly on windings, the stator core and the rotor of the electric drive passes and emits the heat absorbed to the environment via an oil heat exchanger.

Furthermore, it is known from the prior art that heat dissipation from the stator of the electric drive is improved by full encapsulation, preferably in the cooling jacket. In this case, the potting compound by fillers on an increased thermal conductivity and also fills a space between an end face of the stator and the cooling jacket or the flange.

In general, it is also known that a power output of the electric drive is limited for longer operating times by heating limits in the components of the hybrid system. In the given installation space, both the reduction of losses in the system components and the increase in the cooling capacity are associated with high costs for high-quality materials and processes. In the case of oil cooling, the permissible limit temperature of the oil must not be exceeded on all components, as this will otherwise age faster. This applies in particular to the permanent magnets in the rotor assembly, in which increases with increasing operating temperatures, the proportion of high-priced dysprosium and their losses due to operational magnetic flux fluctuations are reduced by an elaborate segmentation of the magnetic poles. Especially in electric drives with concentrated wound individual poles, which are preferably used due to short end windings in hybrid drives, thus resulting in high continuous power at high speeds considerable magnetic costs.

From the DE 10 2008 043 290 A1 and also from the DE 10 2008 040 489 A1 Each hybrid module is known, which comprises a cooling jacket, which is connected via a support member having a flange portion on which the rotor assembly is mounted.

An object of the present invention is therefore to provide a hybrid module for a vehicle that increases the power output of an electric drive in a given space with low cost and Nachbearbeitungsaufwand or reduces the magnet costs at constant power output.

This object is achieved by a hybrid module for a vehicle comprising the features in claim 1 or claim 2.

Another object of the present invention is to provide a low-cost manufacturing method of a hybrid module for a vehicle in which the power output of an electric drive is increased with a small post-processing effort.

This object is achieved by a manufacturing method of a hybrid module for a vehicle comprising the features in claim 8.

Further embodiments of the invention are covered by the subclaims.

The hybrid module according to the invention for a vehicle is arranged between an internal combustion engine and a transmission. The hybrid module includes an electric drive in which a stator encloses a rotor assembly and has a plurality of bobbins. The rotor assembly is provided in a rotor space. Each bobbin has a pipe section formed with an inner flange through which a plurality of coil heads of the stator are supported. The carrier element has a flange portion and a cooling jacket. Preferably, the carrier element is designed such that the flange portion and the cooling jacket are joined together. Likewise, however, it is also conceivable that the flange section and the cooling jacket of the carrier element are not directly adjoining one another. The flange portion supports the rotor assembly and the cooling jacket is disposed on an outer circumferential surface of the stator so that it dissipates the heat loss from the outer surface of the stator.

According to the invention, in a first embodiment, the flange portion of the carrier element has at least one heat-conducting element on at least one side face for cooling the rotor assembly.

In a second embodiment, the inner flange of each bobbin is designed such that a heat flow is reduced or inhibited from the coil ends to the rotor space.

The invention has in its first embodiment, a first side surface of the flange portion of the support member, which faces the electric drive, at least a first heat conducting element, which dissipates by passive heat dissipation or by active heat dissipation, the heat generated by the electric drive.

In a first embodiment, this at least one heat-conducting element is arranged in the installation space of the hybrid module such that it uses existing free spaces in the hybrid module. All previous built in the hybrid module and components can therefore be used further. Thus, no structural changes in the hybrid module must be made. Furthermore, this has the advantage that the thermal management in the hybrid module is optimized in a cost-effective manner.

In a further embodiment of the hybrid module according to the invention, the flange portion of the carrier element forms at least one recess, by means of which the at least one first heat-conducting element is fastened via at least one fastening pin.

In a further preferred embodiment, a second side surface of the flange portion of the carrier element, which is remote from the electric drive, at least a second heat conducting element, which is connected to the at least one first heat conducting element. In this case, the second heat-conducting element is preferably connected via at least one connecting element to the at least one first heat-conducting element. It is also provided in the invention that a first heat conducting element with a second heat conducting element material and / or positive, in particular by upsetting and / or welding, mechanically and thermally connected to each other.

The second heat-conducting element is preferably connected to the first heat-conducting element in such a way that the at least one fastening pin for fastening the first heat-conducting element is connected to the second heat-conducting element via a recess and forms a thermal bridge. During operation of a hybrid module, the at least one first heat-conducting element absorbs the heat from the surroundings of the rotor assembly and for this purpose has a suitable surface structure and / or coating, as described in the following embodiment. The coating is preferably a black non-stick coating. The heat is then forwarded partly directly to the flange portion of the support element, but also via the serving as thermal bridges mounting pins directly to the at least one second heat conducting element. Due to this additional cross-section and its high thermal conductivity, the at least one second heat-conducting element significantly reduces a thermal gradient in the radial direction. This is described below using an example: Between the medium surrounding the rotor assembly and the cooling water at an inlet as a heat sink, a heat flow of about 600 W in the support element, such as steel, a Temperature difference of about 30 to 50 ° C. Internal experiments by the applicant have shown that the temperature difference can be lowered considerably by 30 to 70% through better heat absorption and heat conduction by means of first and / or second heat-conducting elements. Lowering the temperature of the medium surrounding the rotor assembly by 15 to 30 ° C results in a lowering of the magnet temperature in the rotor assembly, increasing the magnetic flux. Advantageously, this in turn significantly cheaper magnets (with low dysprosium content) can be used.

In a further preferred embodiment of the hybrid module according to the invention, at least one third heat-conducting element is provided in addition to the first and the second heat-conducting element. A part of the third heat-conducting element is preferably arranged in front of a stator yoke, thus not in the rotor space, and is in direct contact with the cooling jacket and the at least one second heat-conducting element, so that a thermal resistance between the second heat-conducting element and the cooling channels described above is considerably reduced.

A further preferred embodiment of the invention provides that the passive heat dissipation is formed such that the at least one first heat-conducting element has a surface which is enlarged by elevations and depressions radially to the rotor assembly. In particular, there are first heat-conducting elements in a passive heat dissipation of good heat conducting material. As already described above, the at least one first heat-conducting element is fastened by means of at least one fastening pin in at least one recess of the flange portion of the carrier element, wherein the at least one fastening pin preferably belongs to a first heat-conducting element, that is to say form a component and are preferably produced as a extruded part , Of course, the fixing pin also consists of good heat conducting material.

The active heat dissipation of the first embodiment according to the invention is designed such that the first heat conducting element is an annular, closed component, which is arranged in an axial direction in front of an end face of the rotor assembly. The component forms in the free spaces of the hybrid module between a plurality of coil heads of the stator in a radial direction extending outgoing passages, in which a cooling medium is feasible.

Preferably, the annular component, preferably made of a metal sheet, an inner ring channel with an inlet for the cooling medium (in the direction of gravity preferably above) and an outer ring channel with an outlet for the cooling medium, wherein a transition connects the inner ring channel with the outer ring channel. The transition is preferably formed opposite the inlet and outlet.

In an electric drive with concentrated wound single poles in the stator of the outer ring channel preferably has a plurality of recesses, distributed over a circumference, adapted to receive the coil heads, so that the outer ring channel forms between each successive recesses one of the extending in the radial direction outlet channel. These end in an annular collecting space axially in front of a stator yoke, from where the cooling medium passes through at least one through hole on the outer surface of the cooling jacket of the support element.

In a particularly preferred embodiment, each outlet channel of the first heat-conducting element ends at one or two through-holes. On the outer surface of the cooling jacket, the cooling channels described above then advantageously extend in the axial direction. As a result, the cooling jacket can be produced as a continuous casting cost.

At one end of the cooling jacket, opposite to the end connected to the flange portion, the axially extending, parallel cooling channels terminate in a further annular channel which is either produced by over-turning of the continuous casting or added as a sheet metal part to the front side of the cooling jacket. If the latter case after mounting the prefabricated stator, can be used with the sheet metal part of the space axially in front of the stator yoke for a larger cross-section of this annular channel. Preferably, the outflow of the coolant takes place on the side of the transmission directly from the local annular channel.

If an outflow directly adjacent to the inflow on the side of the internal combustion engine is desired, then the cooling channel on the side of the transmission serves only to deflect the fluid flow and the number of axially extending cooling ducts is doubled. At the circumference, the axial flow direction changes into adjacent cooling channels. A collecting channel on the outlet side is then preferably arranged in the carrier element. For this purpose, the flange of the support member in the radius region of the cooling jacket on a toothing, wherein the tooth elevations close the running away cooling channels and the recesses between the teeth, the liquid from the incoming cooling channels flow into the collection channel.

In the hybrid module according to the invention, the coupling device is a wet clutch, the surrounding medium in the rotor assembly consists of an oil mist. On the one hand, the oil on the one hand generates additional drag losses, but on the other hand, the internal losses of the clutch, including the clutch plate, and the rotor assembly (eddy current losses) are dissipated relatively effectively to the heat sink. Regardless of the surrounding medium (oil mist or dry air), components in the rotating part of the hybrid module are preferably designed such that a flow which is favorable for the heat flow is produced by the rotation.

While the temperature of the medium surrounding the rotor assembly is kept low, the allowable peak temperature in the stator winding should be as high as possible in order to realize a high power density. By using temperature-resistant insulating materials (wire enamel, plastics, etc.), winding temperatures of 180 to 200 ° C can be permitted. However, in order to avoid damage to the oil, this should not come into contact with components whose temperature is above 150 ° C.

As already described in the introductory part of the invention, a supplementary or alternative embodiment of the invention provides that the inner flange of each bobbin is designed such that a heat flow from the winding to the rotor space is reduced. It has been shown that in continuous operation, the core temperature of the stator, as in the tooth head, at high powers and speeds 20 to 30 ° C and at low speeds and high torques even 40 to 50 ° C below the peak temperature in the winding. While a stator core surface facing the air gap has a largely neutral or even cooling effect on the rotor space, the heating of the rotor space from the stator takes place predominantly from the winding through slot slots and in the winding head areas. The solution according to the invention thus contributes to considerably reducing the heat flow from the stator into the rotor space. As a result, the temperature level in the rotor can be lowered by 10 to 20 ° C, which in turn significantly reduces the cost of the magnet.

The inner flange preferably has a thickness of 1 to 3 mm, wherein the thickness in the surface of the inner flange may vary. It is advantageous, however, that the largest thickness of the inner flange is then formed at joints of the bobbin in the middle of slot slots of the stator core.

In contrast to known from the prior art bobbins, the thickness of the inner flange decreases not or only minimally with increasing distance to an end face of the stator. In a preferred embodiment, the thickness of the inner flange with some axial distance from the stator core even increases and indeed on the side facing away from the winding, wherein the increase in thickness on the mounting side of the rotor is about 30 to 80% of the air gap width and on the non-mounting side even greater than the air gap width is executed.

There are two ways in which the bobbins can be designed so that the heat flow from the winding to the rotor space is reduced. A possibility according to the invention is that the bobbins are pre-molded and assembled from plastic. In this case, the inner flange of each bobbin made of a plastic having a poor thermal conductivity, so that the heat flow is reduced or inhibited by the winding to the rotor chamber. Preferably, the pipe section around the tooth neck and the outer flange of the bobbin then consist of a good heat-conducting plastic. For example, the inner flange consists of a largely pure plastic, that is to say without heat-conducting fillers. The remaining area of the bobbin, such. As the pipe section and the outer flange, preferably consists of the same plastic as that of the inner flange, but here the plastic is provided with a thermally conductive filler.

A second possibility is the encapsulation of the laminated cores of the tooth cores to ensure mechanical stability with a high-strength plastic with low thermal conductivity. The plastic consists in an advantageous embodiment of two different plastic components with different Wärmeleitfähigkeiten. Preferably, after the injection process, the pipe section around the tooth neck and the outer flange made of a good heat-conducting plastic and the inner flange, however, from a poorly heat-conductive plastic. For example, the inner flange consists of a largely pure plastic, that is to say without heat-conducting fillers.

An alternative embodiment provides that the entire bobbin, ie the pipe section and the outer and inner flange, consists of a pure plastic, but then a wall thickness within the grooves is reduced to a few tenths.

A further preferred embodiment of the invention provides that an increase of the permissible winding temperature by 10 to 20% is required to increase the power density, so that particularly heat-resistant wire enamels and plastics are used to insulate the slot slot insulation. Preferably, the use of very heat-resistant potting compounds, such as thermoset material, is also provided, which also allow temperatures> 200 ° C and thanks have very high fill levels with good heat-conducting fillers, a high thermal conductivity.

With the measures described, the permissible peak temperature in the windings, in particular in the winding overhang region, can rise to values above 200 ° C. and thus the power density can be increased considerably with little additional costs in the stator. For example: It is generally known that highly thermally conductive potting compounds achieve specific thermal conductivity values of 3 to 5 W / m · K. If, after ensuring the insulation, the remaining cavity is sprayed with a graphite-filled thermosetting plastic, specific thermal conductivity values up to 20 W / m · K are achieved. In contrast, pure plastic materials, such as polyphenylene sulfide, only specific thermal conductivity of 0.2 to 0.3 W / m · K. The material-related difference in thermal conductivity is thus 10 to 100 times.

The inner flange according to the invention with low thermal conductivity between the end windings and the rotor space, considerably inhibits the heat flow from the winding into the rotor space. Compared to the prior art, in which a separation surface between the winding and the rotor chamber is formed by the highly heat-conductive potting compound, the nationwide inner flange provides for an increase in the thermal resistance by a multiple.

The production method of a hybrid module for a vehicle according to the invention is characterized by the following step according to the invention. At least one heat-conducting element for cooling the rotor assembly is attached to at least one side surface of a flange portion of a carrier element.

For reasons of better understanding, the general procedure of the production method of a hybrid drive including the step according to the invention is described here: A flange section for the carrier element is preferably produced by casting and forging or by stamping and bending from a thick sheet metal as a steel part have a very high strength. For the cooling jacket of the carrier element, however, a lower steel alloy can be used with a more favorable thermal conductivity. After prefabrication of both parts holes are then incorporated in the cooling jacket and in the flange for mounting purposes. In a subsequent step, the flange section and the cooling jacket before a post-processing in a lathe (centering and bearing seats) by a welding process media-tightly assembled to the one-piece support member. In or on the subsequently cleaned carrier element, the at least one heat-conducting element is then added to the flange section. If the at least one heat-conducting element has an active heat dissipation, that is to say it is liquid-conducting, then the at least one heat-conducting element is fixed by means of a media-tight laser weld on the inner and outer edges as well as some spot welds. Subsequently, the carrier element is heated and the prefabricated stator is pressed into the carrier element. Thereafter, the sheet metal ring for the transmission-side annular channel and / or the fourth Wärmeleitelementtyp (see 14 ) welded. After pushing a preferably rolled sheet metal sleeve, this is welded to the cooling jacket and the sheet metal ring.

By virtue of at least one heat-conducting element on the flange section of the carrier element, the rotor assembly can thus be effectively cooled in the invention by actively or passively increasing the heat flow from the rotor space to the coolant of the hybrid module, thereby increasing the power output of the electric drive. An advantage is also the outlet channels in the heat-conducting element in a preferred embodiment of the invention, since they achieve a better winding cooling by flow control of the coolant and a significant reduction of the temperature gradient over the circumference of the cooling jacket through the flow paths in the cooling jacket. The cooling by means of the at least one heat conducting element is also arranged in a free space of the hybrid module according to the invention, so that in the invention further components, such as, for example, the clutch plate can be installed without problems. It has also been found that the production of the at least one heat-conducting element on the one hand requires some welding operations, on the other hand, however, allows the use of tools falling components with little reworking effort, which also consist of inexpensive material. Especially in the automated production of large quantities outweighs the cost advantage of the blanks, so that a total cost advantage arises.

In the following, embodiments of the invention and their advantages with reference to the accompanying figures will be explained in more detail. The proportions in the figures do not always correspond to the actual size ratios, as some shapes are simplified and other shapes are shown enlarged in relation to other elements for ease of illustration. Showing:

1 a schematic block diagram of a known from the prior art arranged in a vehicle hybrid module;

2 a schematic longitudinal section through a known from the prior art hybrid module;

3 a schematic longitudinal section through a hybrid module according to the invention;

4 a schematic and partial longitudinal section through a hybrid module according to the invention, with a first embodiment of Wärmeleitelementen

5 a schematic plan view of another embodiment of a heat conducting element of the hybrid module according to the invention 4 ;

6 a schematic and partial longitudinal section through a hybrid module according to the invention, with a further embodiment of Wärmeleitelementen;

7 a partial view of the inner circumferential surface of a stator in a known from the prior art hybrid module;

8th a schematic and partial longitudinal section through a hybrid module according to the invention, with an embodiment of an inner flange of each bobbin;

9 a partial view of the inner circumferential surface of the stator 8th with the invention formed inner flange of each bobbin;

10 a schematic sectional view of the stator along the line AA 8th ,

11 an enlarged detail of the in 10 area marked D;

12 a schematic sectional view of the stator along the line BB 8th .

13 an enlarged detail of the in 12 area marked with E; and

14 a schematic and partial longitudinal section through a hybrid module according to the invention, which represents a further embodiment, which on the in 6 builds embodiments shown.

For identical or equivalent elements of the invention, identical reference numerals are used. Furthermore, for the sake of clarity, only reference symbols are shown in the individual figures, which are required for the description of the respective figure. The illustrated embodiments merely represent examples of how the hybrid module according to the invention for a vehicle and the production method according to the invention of a hybrid module for a vehicle can be configured and thus do not represent a conclusive limitation of the invention.

1 shows a schematic block diagram of a known from the prior art arranged in a vehicle hybrid module. Such a known from the prior art hybrid module 1 is a schematic longitudinal section in 2 shown. Because these two 1 and 2 already described in the introduction, will be omitted at this point again.

3 shows a schematic longitudinal section through a hybrid module according to the invention 1 , The hybrid module 1 comprises a carrier element 13 and a free area 8th , where in this free area 8th the in 4 illustrated electric drive 3 is to arrange, in which a stator 5 a rotor assembly 7 encloses. The carrier element 13 consists of a flange section 15 and a cooling jacket 17 , The flange section 15 stores the rotor assembly 7 and the cooling jacket 17 is on an outer lateral surface 19 of the stator 5 arranged so that this the heat loss from the outer surface 19 of the stator 5 dissipates.

As in 3 can be seen, the hybrid module 1 Free rooms 11 on by in the following 4 and 6 described Wärmeleitelemente 21 . 23 for cooling the rotor assembly 7 are arranged. All other features shown here are already described to the previous figures, so that a renewed description is omitted here.

4 shows a schematic and partial longitudinal section through a hybrid module according to the invention 1 , According to a first embodiment are in the open spaces 11 (please refer 3 ) Heat conducting elements 21 . 23 arranged. In the embodiment shown here, the hybrid module 1 two heat-conducting elements 21 . 23 on.

A first side surface S1 of the flange portion 15 the carrier element 13 that the electric drive 3 facing, provides a first heat conducting element 21 that has formed an active heat dissipation. In particular, the flange portion 15 the carrier element 13 a recess 29 that the inlet 49 out 5 corresponds, formed, by means of which the cooling medium passes from the side surface S2 on the side surface S1. The recess 29 thus forms a fluid connection for the cooling medium from the heat conducting element 21 , Further, a second side surface S2 of the flange portion 15 the carrier element 13 that the electric drive 3 is turned away, a second heat conducting element 23 which is hollow and conveys the cooling medium radially from the outside to the rotor space radius area. Other reference numerals shown here will be described below and are therefore the description of the 6 refer to.

Furthermore, in this view 6 It can be seen that the stator has a plurality of bobbins 41 each bobbin 41 a pipe section 38 with an inner flange 40 and an outer flange 42 has formed through the multiple coil heads 39 of the stator 5 are held.

5 shows an axial plan view of the flange side of the heat conducting element 21 the hybrid module according to the invention 1 (S. 4 ). In this case, the active heat dissipation is achieved in that the first heat-conducting an annular, closed component 21 is and in an axial direction R1 in front of a front side 37 the rotor assembly 5 out 4 is arranged. The component 21 has exit channels 61 formed between the coil ends 39 of the stator 5 in a radial direction R2. In the outlet channels 61 the cooling medium is guided. The annular component 21 can also be formed by a stamping and welding process.

The annular component 21 has an inner ring channel 47 with an inlet 49 for the cooling medium and an outer ring channel S1 with an outlet 53 for the cooling medium, with a transition 55 the inner ring channel 47 with the outer ring channel 51 combines. The transition 55 is as shown here, preferably opposite the inlet and outlet 49 . 53 educated.

In an electric drive 3 with concentrically wound individual poles in the stator 5 , has the annular component 21 a plurality of recesses 59 , over a circumference 57 distributed. These recesses 59 serve to accommodate the coil heads 39 of the stator 5 , so that in the outer ring channel 51 one between each two successive recesses 59 an outflow channel extending in the radial direction R2 61 empties. These then end in an annular collection space 65 axially in front of a stator yoke 67 (please refer 4 ), from where the cooling medium through at least one through hole (not shown) on the outer surface of the cooling jacket 17 the carrier element 13 to be led.

Simplified may be an annular component 21 also only with the inner ring channel 47 be executed. Instead of the transition 55 becomes the outlet 53 through a further recess in the flange section 15 formed by the cooling medium to another hollow running second heat conducting element 23 and from this to the cooling jacket 17 to be led.

6 also shows a schematic and partial longitudinal section through a hybrid module according to the invention 1 according to a further embodiment. The hybrid module 1 points here next to the first heat-conducting element 21 and the second heat conducting element 23 another, third Wärmeleitelement 24 on.

The arrangement of the first and second heat-conducting element 21 . 23 in the hybrid module 1 is the same as the previous one 4 , In particular, but here is the second heat conducting element 23 with the first heat-conducting element 21 about fixing pins 31 connected with each other. The first heat-conducting element 21 has the fixing pins 31 trained, about it z. B. by recesses 29 through with the second heat conducting element 23 is connected. Also in this embodiment are the two mounting pins 31 preferably in one piece with the first heat-conducting element 21 , The first heat-conducting element 21 acts as a heat exchanger in front of the front of the rotor 5 , The fixing pins act here 31 also as thermal bridges. So takes in the operation of a hybrid module 1 the first heat-conducting element 21 the heat from the environment of the rotor assembly 7 and has for this purpose also in a passive heat dissipation on a suitable surface structure. This is how the first heat-conducting element forms 21 in this embodiment radially to the rotor assembly 7 one by raises 33 and depressions 25 enlarged surface. The heat is then partly directly to the flange portion 15 the carrier element 13 , but also on the serving as a thermal bridge mounting pins 31 directly to the second heat conducting element 23 forwarded. This additional cross-section and its high thermal conductivity reduces the second heat-conducting element 23 a thermal gradient in the radial direction R2 considerably. All other reference numerals shown here are the description of the 1 and 2 refer to. Other embodiments may, however, other elements for connecting the first and second heat conducting element 21 . 23 provide, but both heat-conducting elements 21 . 23 always material and / or form-fitting connected to each other, so that a sufficient heat transfer is given.

The third heat conducting element 24 is in this embodiment in front of a stator yoke 67 arranged and is in direct contact with the cooling jacket 17 and the second heat conducting element 23 , Thus, a thermal resistance between the second heat conducting element 23 and the cooling channels described above 45 considerably reduced.

The three heat-conducting elements 21 . 23 . 24 are preferably prefabricated only as sector pieces of a ring, wherein in the circumferential direction between the preferably identical sector pieces gaps for struts, lines, sensors or other functional parts can be arranged.

7 shows a partial view of the inner circumferential surface of an in 2 shown inner flange 40 of bobbins 41 in a hybrid module known from the prior art 1 (S. 2 ). From the bobbin 41 here is only the inner flange 40 to see designated part. The bobbins 41 are each tangential to each other and axially to the flange portion 15 objected. A good heat-conducting potting compound 71 is between the flange portion 15 and the stator 5 (of which only the pole faces of the core and the inner bottle 40 the bobbins 41 can be seen) introduced. Due to the good thermal conductivity of the potting compound 71 reaches a considerable amount of heat to the inner surface of the stator and thereby heats the rotor 25 or the rotor assembly 7 (s 2 ) additionally.

To prevent this additional heating, shows 8th a schematic and partial longitudinal section through a hybrid module according to the invention 1 , with an embodiment of an inner flange 40 each bobbin 41 , which is designed such that a heat flow 69 from the coil heads 39 to the rotor space 6 is reducible or inhibited. Thus, this embodiment provides that each bobbin 41 of the stator 5 consists of two different plastic components with different thermal conductivities. There is a pipe section 38 and an outer flange 42 each bobbin 41 made of a good heat-conducting plastic. The inner flange 40 each bobbin 41 On the other hand, it consists of a poorly heat-conducting plastic. In particular, the inner bottle enough 40 the bobbin 41 up to the flange section 15 zoom in, so that in 7 illustrated potting compound 71 can be separated from the inner circumferential surface of the stator assembly. Thus, no potting compound 71 (or in the mounting gaps only slightly) to the surface to the rotor space 6 , this shows 9 in a partial view of the inner lateral surface along the line CC 8th through the illustrated inner flanges 40 of bobbins 41 according to the invention. The bobbins 41 abut tangentially to each other, also in the slot slots and cover axially the inner surface of the stator 5 up to the flange section 15 from.

10 shows a sectional view of the stator 5 along the line AA 8th , The inner flanges 40 of each bobbin 41 represent a heat-inhibiting layer. The heat-inhibiting layer is concentric about the axis A of the electric drive 3 (S. 4 ) arranged. For a better illustration of this embodiment shows 11 an enlarged detail of the in 10 area marked D. Everyone in the slot slot 70 of the stator 5 arranged part of the heat-insulating layer of the inner flange 40 preferably has a thickness 73 from 1 to 3 mm, with the thickness 73 in the surface of each inner flange 40 can vary. It is advantageous, however, that the largest thickness 73 the heat-inhibiting layer then at joints of the bobbin 41 in the middle of slot slots 70 of the stator 5 is formed, wherein the slot slots 70 to the rotor assembly 7 (please refer 8th ) are aligned.

The 12 and 13 merely show the previously described embodiment of the inventive heat-inhibiting layer of the inner flange for the sake of clarity 40 , while doing so 12 an axial view of the stator 5 off along the BB line 8th (with transparent potting compound) shows. 13 shows an enlarged detail of the in 12 Area marked with E. Further embodiments of the inventive heat-inhibiting layer of the inner flange 40 , such as that a thickness 73 (please refer 11 ) of the heat-inhibiting layer of the inner flange 40 not or only minimally changed are not shown, but as described above conceivable, so that in the invention of the heat-inhibiting layer formed by the inner flanges 40 both the choice of material and / or thickness described above 73 in itself is of importance to the in 8th shown heat flow 69 through the slot slots 70 and from the coil heads 39 to the rotor space 6 to reduce.

It should also be noted that this embodiment of the invention alone or with the heat conducting elements described above 21 . 23 . 24 although not shown here, together in a hybrid module according to the invention 1 can be provided.

14 also shows a schematic longitudinal section through an electric drive 3 a hybrid module according to the invention 1 , The embodiment shown here builds on the in 5 illustrated embodiment. The hybrid module 1 has according to this embodiment, the first heat conducting element 21 , the second heat-conducting element 23 , the third heat-conducting element 24 and a transmission-side heat-conducting element as the fourth heat-conducting element 22 on.

So takes in the operation of the hybrid module 1 the first heat-conducting element 21 and the fourth heat conducting element 22 from the environment of the rotor 25 the heat generated. For this purpose have the first heat-conducting element 21 and the fourth heat conducting element 22 a suitable surface structure. So has the first heat-conducting element 21 and the fourth heat conducting element 22 each on both sides of the rotor 25 several increases 33 and depressions 35 which form such an enlarged surface and extend substantially in the direction of the axis. The heat is removed according to the manner described above.

As well as in 4 are in space axially between the stator yoke 67 and the transmission-side heat conducting element 22 interconnection conductors 28 arranged the stator winding. They leave radial space, leaving the fourth heat-conducting element 22 a direct large-area contact with the cooling jacket 17 can train.

LIST OF REFERENCE NUMBERS

1

hybrid module

3

electric drive

5

stator

6

rotor chamber

7

rotor assembly

8th

free area

9

vibration

10

internal combustion engine

11

free space

13

support element

15

flange

17

cooling jacket

19

lateral surface

21

first heat-conducting element, component

22

transmission-side heat-conducting element

23

second heat-conducting element

24

third heat-conducting element

25

rotor

26

Hollow shaft section

27

coupling device

28

interconnection conductors

29

recess

31

fastening pin

32

connecting element

33

increase

35

deepening

37

Front side of the rotor assembly

38

pipe section

39

coil head

40

inner flange

41

bobbins

42

outer flange

43

casing

44

web

45

cooling channel

47

Inner ring channel

49

inlet

51

Outer ring channel

53

outlet

55

crossing

57

scope

59

recess

61

outlet channel

63

Through Hole

65

plenum

67

stator yoke

69

heat flow

70

slot opening

71

potting compound

73

thickness

100

transmission

A

axis of rotation

R1

axial direction

R2

radial direction

S1

first side surface

S2

second side surface

Claims (8)

Hybrid module ( 1 ) for a vehicle, wherein the hybrid module ( 1 ) between an internal combustion engine ( 10 ) and a transmission ( 100 ), comprising an electric drive ( 3 ), in which a stator ( 5 ) a rotor assembly ( 7 ) in a rotor space ( 6 ) is provided, enclosing and a plurality of bobbins ( 41 ), each bobbin ( 41 ) a pipe section ( 38 ) with an inner flange ( 40 ) has been formed by the plurality of coil heads ( 39 ) of the stator ( 5 ) are supported, and a support element ( 13 ), which has a flange section ( 15 ) and a cooling jacket ( 17 ), wherein the flange portion ( 15 ) the rotor assembly ( 7 ) and the cooling jacket ( 17 ) on an outer lateral surface ( 19 ) of the stator ( 5 ), and wherein at least one heat conducting element ( 21 . 23 ) on at least one side surface (S1, S2) of the flange portion ( 15 ) of the carrier element ( 13 ), and a first side surface (S1) of the flange portion (S1) 15 ) of the carrier element ( 13 ), the electric drive ( 3 ), at least one first heat-conducting element ( 21 ), which has formed a passive heat dissipation or an active heat dissipation, characterized in that the active heat dissipation is formed such that the at least one first heat conducting element is an annular component ( 21 ) and in an axial direction (R1) in front of an end face ( 37 ) of the rotor assembly ( 7 ) is arranged and the component ( 21 ) in open spaces ( 11 ) of the hybrid module ( 1 ) between several coil ends ( 39 ) of the stator ( 5 ) in a radial direction (R2) extending outgoing channels ( 61 ) forms, in which a cooling medium is guided. Hybrid module ( 1 ) for a vehicle, wherein the hybrid module ( 1 ) between an internal combustion engine ( 10 ) and a transmission ( 100 ), comprising an electric drive ( 3 ), in which a stator ( 5 ) a rotor assembly ( 7 ) in a rotor space ( 6 ) is provided, enclosing and a plurality of bobbins ( 41 ), each bobbin ( 41 ) a pipe section ( 38 ) with an inner flange ( 40 ) has been formed by the plurality of coil heads ( 39 ) of the stator ( 5 ) are supported, and a support element ( 13 ), which has a flange section ( 15 ) and a cooling jacket ( 17 ), wherein the flange portion ( 15 ) the rotor assembly ( 7 ) and the cooling jacket ( 17 ) on an outer lateral surface ( 19 ) of the stator ( 5 ), and wherein the inner flange ( 40 ) of each bobbin ( 41 ) is designed such that a heat flow ( 69 ) of the Coil heads ( 39 ) to the rotor space ( 6 ) is reduced or inhibited, characterized in that each bobbin ( 41 ) consists of a two-component plastic with different thermal conductivities, at least one pipe section ( 38 ) and the outer flange ( 42 ) consist of a thermally conductive plastic and the inner flange ( 40 ) has a poor thermal conductivity plastic. Hybrid module ( 1 ) according to claim 1, wherein the flange portion ( 15 ) of the carrier element ( 13 ) at least one recess ( 29 ), by means of which the at least one first heat-conducting element ( 21 ) via at least one fastening pin ( 31 ) is attached. Hybrid module ( 1 ) according to one of claims 1 and 3, wherein a second side surface (S2) of the flange portion ( 15 ) of the carrier element ( 13 ), the electric drive ( 3 ) is remote, at least one second heat conducting element ( 23 ), which with the at least first heat conducting element ( 21 ) connected is. Hybrid module ( 1 ) according to claims 3 and 4, wherein the at least second heat-conducting element ( 23 ) with the at least first heat-conducting element ( 21 ) is connected to one another such that the at least one fastening pin ( 31 ) for fastening the at least one first heat-conducting element ( 21 ) over the at least one recess ( 29 ) with the at least one second heat-conducting element ( 23 ) and is a thermal bridge. Hybrid module ( 1 ) according to claim 1, wherein the passive heat dissipation is formed such that the at least one first heat-conducting element ( 21 ) axially of the rotor assembly ( 7 ) through increases ( 33 ) and depressions ( 35 ) has increased surface area. Hybrid module ( 1 ) according to claim 1, wherein the annular component ( 21 ) an inner ring channel ( 47 ) with an inlet ( 49 ) for the cooling medium and an outer ring channel ( 51 ) with an outlet ( 53 ) for the cooling medium, wherein a transition ( 55 ) the inner ring channel ( 47 ) with the outer ring channel ( 51 ) connects. Production method of a hybrid module ( 1 ) for a vehicle according to one of claims 1 to 7, characterized by the following step, that at least one heat conducting element ( 21 . 23 ) on at least one side surface (S1, S2) of a flange portion ( 15 ) of a carrier element ( 13 ) and / or an inner flange ( 40 ) of a bobbin ( 41 ) is formed such that a heat flow ( 69 ) of several coil ends ( 39 ) to a rotor space ( 6 ) is reduced or inhibited.

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