Stator unit of a drive unit

Abstract

The invention relates to a stator unit (1) of a drive unit (2), comprising at least the following components: - a first stator (3) having a first axially extending stator coolant passage (5); - a second stator (4) having a second axially extending stator coolant passage (6); and - a stator housing (7); wherein the first stator (3) and the second stator (4) are arranged axially in series. The stator unit (1) is characterized in particular in that the stator unit (1) has a central coolant feed (8) which is arranged at least partially in the stator housing (7) and which has separate fluidic connections to the first stator coolant passage (5) and to the second stator coolant passage (6) for the purposes of supplying a cooling fluid. The proposed stator unit is particularly inexpensive to manufacture and allows efficient cooling of the components of the stator unit.

Description

[0001] Stator unit of a drive unit

[0002] The invention relates to a stator unit of a drive unit, as well as a drive unit with such a stator unit.

[0003] Electric drive units with one or two electric motors are known from industrial practice. For example, electric drive units with two electric motors are used in motor vehicles, preferably hybrid vehicles, as transmissions and / or for energy recuperation. In such cases, one electric motor is designed as the prime mover and one electric motor as the generator. Both electric machines each comprise a stator and a rotor. For cooling, the stator is usually sprayed with coolant from the outside. This type of cooling has the disadvantage that the hottest parts of the stator, for example in the area of ​​the stator windings, are not sufficiently cooled. This leads to inefficient cooling and large temperature differences within the stator.

[0004] To address this problem, it is known, for example, for single-machine drive units to direct the cooling fluid through stator slots to enable more direct cooling at the hottest points of the stator. It is also known to transfer such cooling via the stator slots to a dual-machine drive unit, in which both stator units are arranged radially within each other, thus exhibiting no axial offset.

[0005] For a design in which the two electrical machines are arranged axially one behind the other, i.e. offset from each other, there is currently no possibility of implementing such cooling via the stator slots.

[0006] Based on this, the present invention is based on the object of at least partially overcoming the disadvantages known from the prior art. The features of the invention are derived from the independent claims, for which advantageous embodiments are presented in the dependent claims. The features of the claims can be combined in any technically reasonable manner, whereby the explanations from the following description as well as features from the figures, which comprise additional embodiments of the invention, can also be consulted for this purpose.

[0007] The invention relates to a stator unit of a drive unit, comprising at least the following components:

[0008] - a first stator having a first axially extending stator coolant passage;

[0009] - a second stator having a second axially extending stator coolant passage; and

[0010] - a stator housing; wherein the first stator and the second stator are arranged axially in series.

[0011] The stator unit is primarily characterized in that the stator unit has a central coolant supply, which is arranged at least in sections in the stator housing and is in a separate fluidic connection with the first stator coolant passage and the second stator coolant passage for supplying a cooling fluid.

[0012] In the following, reference is made to the specified axis of rotation whenever, without explicit indication to the contrary, the axial direction, radial direction, or the direction of rotation and corresponding terms are used. Ordinal numbers used in the preceding and following descriptions serve only to clearly distinguish them and do not reflect the order or ranking of the designated components. An ordinal number greater than one does not necessarily imply that another such component must be present.

[0013] The stator unit now proposed is designed as part of a drive unit and has at least a first stator, a second stator, and a stator housing. The first stator has a first axially extending stator coolant passage. The second stator has a second axially extending stator coolant passage. The first stator and the second stator are connected axially in series, i.e., they are arranged axially one behind the other and do not overlap axially. The stator unit has a central coolant supply, which is arranged at least partially in the stator housing. The central coolant supply is separately fluidically connected to the first stator coolant passage and the second stator coolant passage in order to supply the first stator and the second stator with a cooling fluid via the central coolant supply.

[0014] The drive unit is, for example, a drive unit of a motor vehicle, preferably a hybrid vehicle. For example, the drive unit is an electric transmission.

[0015] The two electrical machines are generators and / or electric drive motors. Preferably, the first electrical machine is a generator, and the second electrical machine is an electric drive motor. Both electrical machines have a rotor receptacle, in which, when installed, a rotor is rotatably received. In one embodiment, the first rotor and the second rotor are connected to one another in a rotationally fixed manner. In an alternative embodiment, the first rotor and the second rotor are rotatable relative to one another.

[0016] The rotors are preferably rotatable about a common axis of rotation, which defines the axial direction. The stators are preferably arranged coaxially to each other and the axis of rotation. The stators comprise, for example, laminated cores with stator slots and stator windings wound around the laminated cores, extending in the stator slots.

[0017] For example, a magnetic field can be generated by energizing the stator windings. The magnetic field, in interaction with the rotor's permanent magnets, can set the rotor in rotation, or a torque can be generated by the rotor. Alternatively or additionally, a current can be induced in the stator windings by rotating the rotor through the interaction between the permanent magnets and the stator windings. The conversion of current into torque or vice versa, also referred to below as torque conversion, generates heat. This heat is dissipated using a cooling fluid. An axially running stator coolant passage is provided in each stator to guide the cooling fluid through the stators.

[0018] Such a cooling fluid is preferably a dielectric fluid. Some components are referred to as "coolant," but this does not preclude an embodiment in which the stator unit or the drive unit can be cooled with a coolant. Accordingly, the cooling fluid is a coolant or a refrigerant. For example, the cooling fluid can be recooled in a cooling unit.

[0019] Both stator coolant passages can now be supplied with cooling fluid via a common central coolant supply. The central coolant supply is preferably formed by the stator housing or arranged within the stator housing. The stator coolant passages are each separately fluidically connected to the central coolant supply. Separately means that the cooling fluid is not routed through one stator coolant passage to reach the other stator coolant passage. For this purpose, the coolant supply is arranged centrally, preferably axially between the two stators.

[0020] This allows two stators arranged axially in series to be efficiently cooled. The stator coolant passages allow the stators to be cooled at the particularly hot spots.

[0021] It is further proposed in an advantageous embodiment of the stator unit that the fluidic connection at the two stator coolant passages is arranged in the axial direction between the two stators.

[0022] According to this embodiment, the fluidic connection between the central coolant supply and the stator coolant passages is arranged in the axial direction between the two stators. This means that the fluidic connection is arranged at an axial end or on an axial side of the respective stator coolant passage, which is oriented towards the other stator. Preferably, the central coolant supply is arranged axially between the two stators, and the fluidic connections extend axially outward from it. This means that both stators or both stator coolant passages can be flowed through from an axially central position to the outside.

[0023] Such a design enables a simple and component-poor construction of the stator unit.

[0024] It is further proposed in an advantageous embodiment of the stator unit that the first stator coolant passage comprises stator slots and / or stator bores in the first stator, and / or the second stator coolant passage comprises stator slots and / or stator bores in the second stator.

[0025] According to this embodiment, the first stator coolant passage comprises stator slots and / or stator bores. Alternatively or additionally, the second stator coolant passage comprises stator slots and / or stator bores.

[0026] The stator slots and / or stator bores preferably extend axially through the stator cores. Thus, a cooling fluid flowing through a stator slot is preferably in direct contact with the stator winding.

[0027] According to this embodiment, particularly efficient cooling can be achieved by means of a direct flow to the hottest points of the stator.

[0028] It is further proposed in an advantageous embodiment of the stator unit that the stator unit has at least one stator cover which closes off a stator wet space of a respective stator in the stator housing, wherein the at least one stator cover forms a coolant connection between the central coolant supply and the first stator coolant passage of the respective stator, wherein the stator wet space is preferably part of the coolant connection of the respective stator cover and is particularly preferably configured to distribute the cooling fluid in the circumferential direction.

[0029] According to this embodiment, the stator unit has at least one stator cover. The stator cover encloses a stator wet chamber of the respective stator in the stator housing. Furthermore, the stator cover forms a coolant connection between the central coolant supply and the first stator coolant passage. Preferably, the stator wet chamber is part of the coolant connection of the respective stator cover. Particularly preferably, the stator wet chamber is configured to distribute the cooling fluid in the circumferential direction.

[0030] The stator unit thus comprises the first stator cover, which closes off the first, preferably annular, stator wet space of the first stator in the stator housing, and / or the second, preferably annular, stator cover, which closes off the second stator wet space of the second stator in the stator housing. The stator covers are each arranged axially inward of the respective stator, i.e., in the direction of the other stator.

[0031] The first stator cover forms a first coolant connection between the central coolant supply and the first stator coolant passage, and / or the second stator cover forms a second coolant connection between the central coolant supply and the second stator coolant passage. Preferably, the first coolant connection and / or the second coolant connection have a tangential and / or axial extension.

[0032] Preferably, the first stator wet chamber and / or the second stator wet chamber are part of the first coolant connection and the second coolant connection, respectively, and are particularly preferably configured to distribute the cooling fluid in the circumferential direction, i.e., before the cooling fluid enters the respective stator or the respective stator coolant passage. Preferably, at least one stator cover is provided for each stator.

[0033] It is further proposed in an advantageous embodiment of the stator unit that the at least one stator cover is clamped under a prestress between the stator housing and the stator in question, and wherein preferably the at least one stator cover is C-shaped in cross section, is made of plastic and / or comprises a rubber sealing ring by means of which the same stator cover is sealed against the stator housing or the stator in order to generate at least parts of the prestress.

[0034] According to this embodiment, the at least one stator cover is subjected to a preload. For example, the stator cover is clamped between the respective stator and the stator housing in such a way that the preload is thereby established.

[0035] The stator cover preferably has a shape that enables or improves a spring action and simultaneously defines a stator wet space. For example, the stator cover has a C-shaped cross-section, or an annular stator cover has a C-shaped cross-section when viewed tangentially.

[0036] The stator cover is preferably made of a material that enables or improves the spring action. Such a material is preferably elastic, generates a high restoring force upon elastic deformation, and exhibits low relaxation. For example, such a material is a plastic.

[0037] Preferably, the at least one stator cover comprises at least one rubber sealing ring, which is arranged circumferentially between the stator cover and the stator housing and seals them against each other. Alternatively or additionally, the at least one stator cover comprises at least one rubber sealing ring, which is arranged circumferentially between the stator cover and the respective stator and seals them against each other. Such a rubber sealing ring is preferably arranged between the laminated cores of the stator and the stator cover. Particularly preferably, the rubber sealing ring is arranged radially outside the stator wet space.It is further proposed in an advantageous embodiment of the stator unit, wherein the central coolant supply comprises a radial section which extends from radially outside to radially inside, preferably up to the fluidic connection with the at least one stator cover, and is arranged in the axial direction between the first stator and the second stator.

[0038] According to this embodiment, a radial section of the coolant supply is arranged axially between the two stators.

[0039] The radial section of the coolant supply preferably extends from the radial outside to the radial inside up to a radius on which the at least one coolant connection is arranged. If, in the preferred embodiment, one coolant connection is provided per stator, the radial section preferably extends up to a radius on which one of the coolant connections, preferably the radially inner one of the two coolant connections, is arranged.

[0040] It is further proposed in an advantageous embodiment of the stator unit that the first stator and the second stator are axially spaced from one another by an axial intermediate space, in which axial intermediate space a radially extending housing intermediate section of the stator housing is arranged, on which the at least one stator cover is preferably supported.

[0041] According to this embodiment, the first stator and the second stator are axially spaced from one another, such that an axial space is arranged between the first stator and the second stator. A radially extending intermediate housing section is arranged in the axial space between the two stators. The intermediate housing section thus axially divides the receiving space of the stator housing into two sections, in each of which a stator is accommodated. For example, the two stators can be pushed into the stator housing from opposite axial sides for assembly. For example, the respective stator cover is placed onto the stator in a pre-assembly step. Stator covers preferably lie against the intermediate housing section in the axial direction or are pressed against the intermediate housing section in order to provide the preload.

[0042] For example, a portion of the radial section of the central coolant supply is arranged in the housing intermediate section. Preferably, part of the radial section is formed by the housing intermediate section.

[0043] In an advantageous embodiment of the stator unit, it is further proposed that the at least one stator cover is arranged in the axial space. The first stator cover and / or the second stator cover are arranged in the axial space.

[0044] According to this embodiment, the at least one stator cover is arranged in the axial space; preferably, both stator covers are arranged in the axial space. Preferably, the stator covers rest against the intermediate section of the stator housing with a side facing away from the respective stator, or press against it, to generate the preload.

[0045] In an alternative embodiment, the stator covers press against each other with the sides facing away from the stators. This embodiment also allows for preloading of the stator covers.

[0046] It is further proposed in an advantageous embodiment of the stator unit that a fluid flow regulation unit is arranged between at least one of the two stator coolant passages and the central coolant supply, by means of which a distribution of the cooling fluid between the first stator and the second stator can be defined, wherein the fluid flow regulation unit is preferably a throttle.

[0047] According to this embodiment, a first fluid flow regulation unit is arranged between a first stator coolant passage and the central coolant supply, and / or a second fluid flow regulation unit is arranged between the second stator coolant passage and the central coolant supply. Thus, at least one, preferably at least two, particularly preferably exactly two fluid flow regulation units are included. A distribution of the cooling fluid between the first stator and the second stator can be defined by means of the at least one fluid flow regulation unit.

[0048] Preferably, the at least one fluid flow regulation unit is a throttle. In such an embodiment, the distribution of the cooling fluid between the two stators is passively defined by the flow cross-section of the at least one throttle.

[0049] Alternatively, the at least one fluid flow regulation unit is a controllable valve. In such an embodiment, a cooling fluid flow through the first stator or second stator is actively controllable.

[0050] According to a further aspect, a drive unit is proposed, comprising at least the following components:

[0051] - a stator unit according to an embodiment as described above;

[0052] - a first rotor which is in magnetic connection with the first stator for torque conversion;

[0053] - a second rotor which is in magnetic connection with the second stator for torque conversion;

[0054] - a first shaft which is torque-fixedly connected to the first rotor; and

[0055] - a second shaft which is torque-fixedly connected to the second rotor.

[0056] According to this aspect, a drive unit is now proposed which has a stator unit, a first rotor, a second rotor and at least one shaft which is torque-fixedly connected to one or each of the rotors.

[0057] The stator unit is a stator unit according to the above

[0058] Description. The drive unit preferably has a first shaft which is torque-fixedly connected to the first rotor, and a second shaft which is torque-fixedly connected to the second rotor.

[0059] The drive unit is, for example, a drive unit of a motor vehicle, preferably a hybrid vehicle. For example, the drive unit is an electric transmission.

[0060] Preferably, at least one of the shafts is a hollow shaft in which the other shaft is rotatably received. Preferably, an axial coolant line is formed in at least one of the two shafts, preferably at least in the interior of the two shafts, by means of which the first rotor and / or the second rotor can be cooled.

[0061] For example, branch lines are formed from the axial coolant line to cool the rotors.

[0062] It is further proposed in an advantageous embodiment of the drive unit that a first electrical working machine comprising the first rotor and the first stator is a generator, and a second electrical working machine comprising the second rotor and the second stator is a drive machine.

[0063] The invention described above is explained in detail below against the relevant technical background with reference to the accompanying drawings, which show preferred embodiments. The invention is in no way limited by the purely schematic drawings, whereby it should be noted that the drawings are not to scale and are not suitable for defining proportions. It is shown in

[0064] Fig. 1 : perspective cross-sectional view of a drive unit with a stator unit;

[0065] Fig. 2: a detailed view of the cross-sectional view according to Fig. 1;

[0066] Fig. 3: a cross-sectional view of the drive unit according to Fig. 1;

[0067] Fig. 4: a cross-sectional view of the drive unit from Fig. 1; Fig. 5: a detailed view of the cross-sectional view from Fig. 1;

[0068] Fig. 6: exposed representation of the first stator and the second stator according to Fig. 1;

[0069] Fig. 7: a second stator cover of the drive unit according to Fig. 1 in a perspective view;

[0070] Fig. 8: a detailed view of the second stator cover according to Fig. 7;

[0071] Fig. 9: a detailed view of the second stator cover according to Fig. 7 in a sectional view;

[0072] Fig. 10: the first stator cover of the drive unit according to Fig. 1 in a perspective view;

[0073] Fig. 11: a detailed view of the first stator cover according to Fig. 10; and Fig. 12: a detailed view of the first stator cover according to Fig. 11.

[0074] Fig. 1 shows a perspective cross-sectional view of a drive unit 2 with a stator unit 1 and a rotor unit. The cross-sectional view shows the drive unit 2 viewed orthogonally to the axial direction. The cross-section through a stator housing 7 of the stator unit 1 does not run along a straight plane; instead, the stator housing 7 is further cut out in sections to increase clarity.

[0075] The stator unit 1 comprises a first stator 3 and a second stator 4. The rotor unit comprises a first rotor 22 with a first shaft 24 and a second rotor 23 with a second shaft 25. The first rotor 22 is in a torque-converting connection with the first stator 3 and the second rotor 23 is in a torque-converting connection with the second stator 4. Torque-converting is to be understood here as meaning that an electrical current can be converted into a torque or vice versa. Preferably, a first electrical working machine 26, which comprises the first stator 3 and the first rotor 22, is designed to convert a torque in the first rotor 22 into a current in the first stator 3. A second electrical working machine 27 is designed to convert a current in the second stator 4 into a torque in the second rotor 23. In other words, the first electrical

[0076] The working machine 26 is a generator, and the second electrical working machine 27 is a drive machine. As shown, the first electrical working machine 26 is shown on the left and the second electrical working machine 27 is shown on the right.

[0077] By means of such a drive unit 2, for example, there is an electric transmission which is designed to convert an input torque at the generator into an output torque at the drive machine by means of an intermediate conversion into electrical current.

[0078] Both stators 3, 4 comprise laminated cores 32 made of multilayer stator laminations. The stator laminations are arranged in a ring shape, for example, and form stator teeth around which stator windings 33 are wound. In the axial direction, the stator windings 33 extend through stator slots 9 formed between the stator teeth.

[0079] The two rotors 22, 23 each comprise permanent magnets and are each torque-fixedly connected to a shaft 24, 25. As shown, the first shaft 24 of the first rotor 22 is arranged within the second shaft 25. Both shafts 24, 25 are designed as hollow shafts. An axial coolant line 28 is arranged in the corresponding cavity of the first shaft 24. The first shaft 24 is arranged in the corresponding cavity of the second shaft 25.

[0080] The stator housing 7 has an intermediate housing section 19, which axially divides the stator housing 7 into two sections. One of the two stators 3, 4 is arranged in each of the two sections. Both stators 3, 4 comprise a stator wet chamber 12, 13. The stator wet chamber 12, 13 is preferably sealed fluid-tight from the environment and is configured to accommodate a cooling fluid. The cooling fluid is preferably a dielectric liquid and is conveyed in a cooling circuit, for example, with a pump and a recooling device.

[0081] The cooling fluid supply to the stators 3, 4 is via a central coolant supply 8. This central coolant supply 8 runs through the stator housing 7. Stator coolant passages 5, 6 of the stators 3, 4 are fluidly connected to the coolant supply 8 by means of a coolant connection 14, 15. A first coolant connection 14 thus connects the central coolant supply 8 to the first stator coolant passage 5, and a second coolant connection 15 connects the central coolant supply 8 to the second stator coolant passage 6 (not shown here, see, for example, Fig. 6).

[0082] The central coolant supply 8 has a radial section 17 in the stator housing 7. Two axial sections branch off from the radial section 17 at a radially inner end in opposite directions. These are, in turn, connected to the coolant connections 14, 15. The radial section 17 is arranged axially between the two stators 3, 4.

[0083] The stator coolant passages 5, 6 extend axially through the respective stator 3, 4. In the illustrated, preferred embodiment, the stator coolant passages 5, 6 are arranged in the stator slots 9 or formed by the stator slots 9. Alternatively or additionally, further stator passages are provided in the stators 3, 4, by means of which the cooling fluid can be guided in the axial direction through the stators 3, 4. For example, additional bores are arranged in the stator laminations or lamination stacks 32.

[0084] The stator wet chamber 12, 13 of the stators 3, 4 is each enclosed along the axial direction by a stator cover 10, 11. The stator covers 10, 11 are arranged axially between the two stators 3, 4, i.e., in an axial gap 18.

[0085] The stator covers 10, 11 are axially clamped between the respective stator 3, 4 and the housing intermediate section 19. This enables easy assembly and sealing of the stator wet chambers 12, 13.

[0086] The first coolant connection 14, which connects the first stator wet space 12 to the central coolant supply 8, is also connected to a rotor coolant supply 29, as shown. The rotor coolant supply 29 is guided radially outward past the first stator 3 and radially inward at the outer, left-hand, axial end of the drive unit 2, in order to connect there to a rotor cooling system. Fig. 2 shows a detailed view of the cross-sectional view according to Fig. 1. Only half above the rotational axis 31 of the essentially rotationally symmetrical drive unit 2 is shown. In this respect, reference is made to the above description. Furthermore, indicator lines for the cross-sectional views shown in Fig. 3 and Fig. 4 are shown.

[0087] Fig. 3 shows a cross-sectional view of the drive unit 2 from Fig. 1. The viewing direction shown is parallel to the rotation axis 31. The section runs through the first stator 3 according to the left section line shown in Fig. 2.

[0088] Fig. 4 shows a cross-sectional view of the drive unit 2 from Fig. 1. The viewing direction shown is parallel to the rotation axis 31. The section runs through the second stator 4 according to the right-hand section line shown in Fig. 2.

[0089] Fig. 5 shows a detailed representation of the cross-sectional view from Fig. 1. The sealing of the stator wet spaces against the stator laminations of stators 3, 4 is particularly evident. For this purpose, a rubber sealing ring 16 is arranged between the first lamination stack 32 of stator 3 and the first stator cover 10, and between the lamination stack 32 of the second stator 4 and the second stator cover 11.

[0090] Due to the pre-tensioning of the stator covers 10,11, as already described, the stator wet spaces 12,13 are sealed.

[0091] Fig. 6 shows an exposed view of the first stator 3 and the second stator 4 of the stator unit 1 according to Fig. 1 . The view has been rotated compared to Fig. 1, so that the first stator 3 is arranged on the left as shown and the second stator 4 on the right. The illustration particularly shows the arrangement of the coolant connections 14, 15. It can also be seen that the annular stator covers 10, 11 form a wet space around the stator windings 33 so that they can be cooled by means of a cooling fluid. The stator windings 33 run in the axial direction through the stator slots 9, which are also visible, and the cooling fluid can be conducted through the stators 3, 4 in the axial direction along the stator windings 33. As shown, the cooling fluid is supplied to the stator wet space 12, 13 in an approximately tangential direction.This leads to a good distribution of the cooling fluid over the circumference of the stators 3, 4 or the stator wet spaces 12, 13 and thus to a uniform flow of cooling fluid through all stator slots 9.

[0092] The rotors 22, 23 are not shown here, so that the rotor holder 30 of the stator unit 1 is empty.

[0093] Fig. 7 shows a perspective view of the second stator cover 11 of the drive unit 2 according to Fig. 1. The second stator cover 11 is made of plastic, for example, and has a tangential inlet area serving as a coolant connection 15. External ribs stabilize the second stator cover 11.

[0094] Fig. 8 shows a detailed view of the second stator cover 11 from Fig. 7. The second stator cover 11 is shown here viewed from the second stator wet chamber 13. Thus, the U-shaped cross-section of the second stator cover 11 is clearly visible. A passive throttle 21 with a flow cross-section that is reduced compared to the second coolant connection 15 defines how much cooling fluid flows into the second stator cover 11 and thus into the second stator wet chamber 13 and through the second stator 4 during operation.

[0095] Fig. 9 shows a further detailed view of the second stator cover 11 according to Fig. 7 in a sectional view. This clearly shows the constriction of the flow cross-section by the second throttle 21.

[0096] Fig. 10 shows a perspective view of the first stator cover 10 of the drive unit 2 shown in Fig. 1. The first stator cover 10 is made of plastic, for example, and has a tangential inlet area serving as a coolant connection 14. External ribs stabilize the first stator cover 10.

[0097] The rotor coolant supply 29 also branches off from the first coolant connection 14. Fig. 11 shows a detailed view of the first stator cover 10 from Fig. 10.

[0098] The first stator cover 10 is shown here viewed from the first stator wet chamber 12. Thus, the C-shaped cross-section of the first stator cover 10 can be seen, viewed tangentially. A passive throttle 20 with a reduced diameter compared to the first coolant connection 14

[0099] Flow cross-section defines how much cooling fluid flows into the first stator cover 10 and thus into the first stator wet space 12 and through the first stator 3.

[0100] Fig. 12 shows a further detailed view of the first stator cover 10 according to Fig. 7 in a sectional view. This clearly shows the constriction of the flow cross-section by the first throttle 20.

[0101] The proposed stator unit can be manufactured particularly cost-effectively and enables efficient cooling of the components of the stator unit.

[0102] List of reference symbols

[0103] Stator unit

[0104] Drive unit first stator second stator first stator coolant passage second stator coolant passage

[0105] Stator housing

[0106] Coolant supply

[0107] Stator groove first stator cover second stator cover first stator wet chamber second stator wet chamber first coolant connection second coolant connection

[0108] rubber sealing ring

[0109] Radial section

[0110] space

[0111] Housing intermediate section first throttle second throttle first rotor second rotor first shaft second shaft first electric machine second electric machine coolant line

[0112] Rotor coolant supply

[0113] Rotor mount

[0114] axis of rotation

[0115] Sheet metal package

[0116] Stator windings

Claims

Patent claims 1 . Stator unit (1) of a drive unit (2), comprising at least the following components: - a first stator (3) with a first axially extending stator coolant passage (5); - a second stator (4) with a second axially extending stator coolant passage (6); and - a stator housing (7); wherein the first stator (3) and the second stator (4) are arranged axially in series, characterized in that the stator unit (1) has a central coolant supply (8) which is arranged at least in sections in the stator housing (7) and is in a separate fluidic connection with the first stator coolant passage (5) and the second stator coolant passage (6) for supplying a cooling fluid.

2. Stator unit (1) according to claim 1, wherein the fluidic connection at the two stator coolant passages (5,6) is arranged in the axial direction between the two stators (3,4).

3. Stator unit (1) according to claim 1 or claim 2, wherein the first stator coolant passage (5) comprises stator slots (9) and / or stator bores in the first stator (3), and / or the second stator coolant passage (6) comprises stator slots (9) and / or stator bores in the second stator (4).

4. Stator unit (1) according to one of the preceding claims, wherein the stator unit (1) has at least one stator cover (10, 11) which closes off a stator wet space (12, 13) of a respective stator (3, 4) in the stator housing (7), wherein the at least one stator cover (10, 11) has a coolant connection (14, 15) between the central coolant supply (8) and the first stator coolant passage (5,6) of the respective stator (3,4), wherein the stator wet space (12,13) ​​is preferably part of the coolant connection (14,15) of the respective stator cover (10,11) and is particularly preferably designed to distribute the cooling fluid in the circumferential direction.

5. Stator unit (1) according to one of the preceding claims, wherein the at least one stator cover (10, 11) is clamped under a prestress between the stator housing (7) and the relevant stator (3, 4), and wherein preferably the at least one stator cover (10, 11) is C-shaped in cross-section, is made of plastic and / or comprises a rubber sealing ring (16) by means of which the said stator cover (10, 11) is sealed against the stator housing (7) or the stator (3, 4) in order to generate at least parts of the prestress.

6. Stator unit (1) according to one of the preceding claims, wherein the central coolant supply (8) comprises a radial section (17) which extends from radially outside to radially inside, preferably up to the fluidic connection with the at least one stator cover (10, 11), and is arranged in the axial direction between the first stator (3) and the second stator (4).

7. Stator unit (1) according to one of the preceding claims, wherein the first stator (3) and the second stator (4) are axially spaced from one another by an axial intermediate space (18), in the axial intermediate space (18) a radially extending housing intermediate section (19) of the stator housing (7) is arranged, on which preferably the at least one stator cover (10, 11) is supported.

8. Stator unit (1) according to claim 7, wherein the at least one stator cover (10, 11) is arranged in the axial space (18). the first stator cover (10) and / or the second stator cover (11) are arranged in the axial space (18).

9. Stator unit (1) according to one of claim 4 to claim 8, wherein a fluid flow regulation unit is arranged between at least one of the two stator coolant passages (5, 6) and the central coolant supply (8), by means of which a distribution of the cooling fluid between the first stator (3) and the second stator (4) can be defined, wherein the fluid flow regulation unit is preferably a throttle (20, 21).

10. Drive unit (2), comprising at least the following components: - a stator unit (1) according to one of the preceding claims; - a first rotor (22) which is in magnetic connection with the first stator (3) for torque conversion; - a second rotor (23) which is in magnetic connection with the second stator (4) for torque conversion; - a first shaft (24) which is torque-fixedly connected to the first rotor (22); and - a second shaft (25) which is torque-fixedly connected to the second rotor (23).

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