Drive device and drive unit

Abstract

The present invention relates to a drive device, and to a drive unit which comprises the drive device. A drive device (2) comprises an electric rotary machine (10) and a frame (40), wherein the electric rotary machine (10) is mechanically supported on the frame (40) by way of contact, and wherein at least one depression (81) is formed in at least one support surface (80), by means of which support surface one of the two elements, electrical rotary machine (10) and frame (40), bears against the respective other element for the purpose of mechanical support, in order to space the electric rotary machine (10) and the frame (40) apart from one another in some regions, wherein the depression (81) forms an empty space. The drive device and the drive unit proposed here provide solutions which enable a high degree of efficiency of an electric rotary machine in a simple, cost-effective and space-saving manner.

Description

[0001] P 241512

[0002] - 1 -

[0003] Drive device and drive unit

[0004] The present invention relates to a drive device and a drive unit comprising the drive device.

[0005] The increasing electrification of drive systems, particularly in the automotive industry, places ever higher demands on the efficiency and durability of the components used. Electric rotary motors form the core of modern drive systems and are the focus of numerous innovations aimed at optimizing efficiency. The goal is to increase vehicle range and reduce overall system costs.

[0006] Efficient thermal management plays a key role, as heat generation significantly influences both the efficiency and lifespan of the electric rotary machine, as well as the sizing of cooling systems. To achieve an optimal balance between high efficiency and maximum performance, effective cooling of the components of the electric drive system, especially the electric rotary machine, is crucial. In addition to the heat generated by the electric rotary machine itself, thermally coupled components also contribute to its overall temperature. Components such as gearboxes can generate heat that is transferred to the electric rotary machine, negatively impacting its operation.Since drive systems with electric rotary machines are often designed to be very compact, such heat sources are often located close to the electric rotary machine, which further promotes heat transfer.

[0007] Against this background, technical solutions are needed that control and, if necessary, reduce heat transfer to the electric rotary machine without compromising mechanical stability or the ability to integrate it into existing drive systems. P 241512

[0008] -2 -

[0009] Various approaches for connecting components to electric rotary machines are known from the state of the art.

[0010] DE 102021 1219 10 A1 discloses an electric machine for a motor vehicle drive, comprising a housing, a stator received in the housing and a rotor non-rotatably connected to a connecting shaft, wherein the connecting shaft is radially and axially supported on the housing side towards a first axial side of the rotor via a double-row rolling bearing arrangement and is supported on the housing side towards a second axial side of the rotor facing away from the first axial side via an additional rolling bearing designed at least for the transmission of axial forces.

[0011] DE 102021 1219 12 A1 relates to an electric machine for a motor vehicle drive, comprising a main housing body, a stator directly received in a stator housing, wherein a support wall of the stator housing extending at least partially radially is attached to the main housing body by means of at least one fastening element, and a rotor non-rotatably connected to a connecting shaft, wherein the connecting shaft is radially and axially supported on a radial inner side of the support wall via a main roller bearing.

[0012] Based on this, the invention aims to provide a drive device and a drive unit which enable a high efficiency of an electric rotary machine in a simple, cost-effective and space-saving manner.

[0013] This problem is solved by the drive device according to claim 1 and the drive unit according to claim 9. Advantageous embodiments of the drive device are specified in dependent claims 2 to 8, and an advantageous embodiment of the drive unit is specified in dependent claim 10.

[0014] The features of the claims can be combined in any technically meaningful way, taking into account the explanations in the following P 241512.

[0015] - 3 -

[0016] The description and features shown in the figures can be used to illustrate supplementary embodiments of the invention. Within the context of the present invention, the terms "radial", "axial", "axis-parallel", and "circumferential direction" always refer to the axis of rotation of the rotor of the electric rotary machine.

[0017] The invention relates to a drive device comprising an electric rotary machine and a frame, wherein the electric rotary machine is mechanically supported by resting against the frame, and wherein at least one support surface, with which one of the two elements (electric rotary machine and frame) abuts the other element for mechanical support, has at least one recess formed in order to space the electric rotary machine and the frame apart from each other in certain areas. The recess forms an empty space.

[0018] This means that the support surface has at least one contact area where the support surface rests against the other element for mechanical support.

[0019] The support surface can, for example, be a radius area, i.e., a ring-shaped area extending along a circumference. This circumference does not necessarily have to be an outer circumference, but can also be an imaginary perimeter within a component.

[0020] The recess can be arranged in a support surface of the frame or in a support surface of the electric rotary machine, or there can be a recess in a support surface of the frame as well as in a support surface of the electric rotary machine, so that these two recesses together define a common space.

[0021] It is also possible that at least one recess is present in each support surface of the frame and at least one recess in the P 241512

[0022] - 4 -

[0023] An electric rotary machine is present, defining spatially separate spaces.

[0024] The frame can be designed as a housing component or as a housing, for example as a gearbox housing.

[0025] Optionally, the electric rotary machine may also include a housing, whereby the frame can abut this machine housing or at least one housing component forming the machine housing. In this case, the support surface can be formed by one or more housing components of the electric rotary machine's machine housing and / or by the frame.

[0026] The system between the frame and the electric rotary machine can be implemented directly or indirectly, such as by arranging an intermediate layer between the frame and the electric rotary machine.

[0027] The electric rotary machine can also be fixed to the frame by means of or in addition to the support.

[0028] The depression can also be described as a so-called pocket.

[0029] There may be several such pockets in the support surface.

[0030] It is possible that nothing is arranged in the empty space of the recess. That is, that the space is not filled by any further element of the drive assembly. Air may be present in the empty space, and, in accordance with the invention, it cannot be ruled out that another fluid is present in the empty space or enters it. P 241512

[0031] - 5 -

[0032] In particular, according to the invention, neither a sealing element that substantially fills the space nor a screw connection that substantially fills the space is arranged in it.

[0033] In an advantageous embodiment, the depth of the recess can be 0.5 mm or more. The depth is defined from the support surface. If the support surface is arranged perpendicular to the axis of rotation of the electric rotary machine, the depth of the recess extends in a direction parallel to the axis.

[0034] The depression or depressions may have been created by machining into the support surface of the frame and / or the support surface of the electric rotary machine.

[0035] The drive mechanism and at least one described recess can reduce heat transfer between the frame and the electric rotary machine. This is due, firstly, to the reduced effective contact area between the frame and the electric rotary machine, and secondly, to the insulating effect of the empty space formed by the recess.

[0036] For example, this can counteract heat transfer from the housing to the electric rotary machine and thus prevent overheating of the electric rotary machine. This may potentially increase the efficiency of the electric rotary machine.

[0037] Furthermore, the reduced heat transfer may reduce the cooling power required for the electric rotary machine, which can also contribute to an improvement in the efficiency of a drive arrangement encompassing the drive unit.

[0038] It may be provided that the support surface runs in a first plane and that a space defined by at least one depression exists between the first P 241512

[0039] - 6 -

[0040] plane or a second plane running parallel to the first plane, and a further plane running parallel to the first plane.

[0041] The next level can run within the frame or within the electric rotary machine.

[0042] Advantageously, the first plane runs perpendicular to the axis of rotation of the electric rotary machine, and thus the next plane and, if applicable, the second plane also run perpendicular to the axis of rotation of the electric drive machine.

[0043] In the event that the defined space extends between the second level and the further level, it is provided that the first level lies within the frame and the second level lies within the electric rotary machine, or vice versa. That is to say, there is at least one first recess in the frame and one second recess in the electric rotary machine, defining a common space.

[0044] A wall defining the floor area of ​​the depression can run in the further plane and thus be aligned parallel to the first plane and / or parallel to the second plane.

[0045] Alternatively, the space defined by at least one depression can extend between the aforementioned planes, whereby the wall of the depression defining the floor area need not necessarily lie entirely within the other plane, but can, for example, be curved and / or only partially within the other plane. The other plane then forms the lowest point of the corresponding depression.

[0046] In the case of a further depression, this also applies to the wall defining the floor area of ​​the second depression with respect to the second level. P 241512

[0047] - 7 -

[0048] The support surface can alternatively be a curved surface, such as the lateral surface of a rotationally symmetric body. In this case, the depression extends from this support surface into the body of the element that forms the support surface.

[0049] The support surface can extend radially or parallel to the axis.

[0050] In one embodiment, the electric rotary machine is an axial flux machine, wherein the stator of the axial flux machine is mechanically supported on the frame.

[0051] The stator may include a stator housing which is mechanically supported on the frame by the support surface.

[0052] The support surface can, for example, run perpendicular to the axis of rotation of the rotor of the axial flux machine.

[0053] The stator may comprise two stator halves. Furthermore, the stator may have an independent fluid-based cooling system with internal channels, with the electric rotary machine itself being designed as a dry chamber.

[0054] It can be provided that the contact areas of the support surface and the recesses are arranged alternately on the same radius around a circumference. The radius is a ring-shaped area that runs along a circumference, which need not necessarily be an outer circumference, but can also be an imaginary circumference within a component.

[0055] The recesses may be of equal size. Furthermore, the contact areas may each be of equal size, so that the recesses are arranged at the same angular distance from each other. A changed angular distance and thus P 241512

[0056] - 8 -

[0057] However, differently sized installation areas and / or depths are not excluded.

[0058] For example, a total of twelve depressions and twelve support areas can be arranged in or formed by the support surface.

[0059] The mounting areas can each have fixing elements designed to secure the electric rotary machine to the frame. For example, each mounting area can have at least one through-hole or screw-in opening, such as a through-hole or a hole with an internal thread, in which the electric rotary machine is or can be mechanically fixed to the frame using screw connections. Optionally, additional or alternative mechanical fixing is provided or implemented outside the support surface. Such screw connections can also clamp the frame and the electric rotary machine together.

[0060] If necessary, the size of the contact surfaces depends on the pressure surfaces required for clamping, which are pressed together by the screw connections.

[0061] It is possible that the alternatingly arranged depressions are connected to each other on at least one radial side of the support surface, so that they form a common depression area.

[0062] Advantageously, the support surface runs essentially perpendicular or has a perpendicular component in relation to the axis of rotation.

[0063] The radial side of the support surface where the connection is made can be, with respect to the axis of rotation, the radially outer side of the support surface and / or the radially inner side of the support surface. P 241512

[0064] - 9 -

[0065] Accordingly, the space between the frame and the electric rotary machine can be radially open. Alternatively, such a radial opening is closed by a substantially axially projecting shaped part of the other element of the frame and the electric rotary machine that does not form the recess.

[0066] The common recess area is accordingly interrupted by the support surface or its contact areas, in which no common recess area is formed. This ultimately further reduces the size of the support surface in contact with the respective other element, thereby hindering heat transfer between the frame and the electric rotary machine.

[0067] In an advantageous embodiment, a space delimited from the recess and the respective other element is sealed at least on one side by at least one seal arranged in a groove.

[0068] The seal can be designed in such a way that it seals the space in a fluid-tight manner, where the fluid can be, for example, oil.

[0069] Furthermore, the seal can be designed as a gasket and arranged in a circumferential groove.

[0070] For example, a side sealed by the gasket could be a radial side of the recess.

[0071] Advantageously, the groove with corresponding seal is arranged in the support surface of the element in which the recess is also formed, but it can also be arranged in the support surface of the other element. P 241512

[0072] - 10 -

[0073] Alternatively, the groove with a suitable seal can be located outside the support surface, for example on a radially outward-facing side of the frame or the electric rotary machine.

[0074] The groove with the corresponding seal can be located outside the recess itself, for example, offset radially in relation to the recess.

[0075] It is also possible that the room has unsealed openings, which may be designed for guided fluid flow.

[0076] The space delimited by the depression and the other element can therefore only be essentially limited by the depression and the other element, with a minimal gap adjoining this space that leads to the seal which ensures the sealing of the space.

[0077] In an alternative embodiment, the seal is arranged at least partially within the recess, so that the seal forms a boundary of the space created by the recess.

[0078] The groove and seal can be arranged at the end of the recess, so that the recess extends essentially on one side from the seal, or the groove and seal can be arranged in such a way that it divides the space formed by the recess into two spaces.

[0079] Despite the seal being positioned at least partially within the recess, the groove receiving the seal can be located in or within the support surface of the frame and electric rotary machine element that forms the recess, or alternatively, in the support surface of the other adjacent frame and electric rotary machine element. P 241512

[0080] - 11 -

[0081] The groove and / or the seal in the groove can additionally reduce the thermally relevant contact area between the electric rotary machine and the frame.

[0082] Optionally, the drive mechanism includes two grooves, each containing a seal arranged to seal the recess on both sides and / or to form a boundary on both sides of the space created by the recess. For this purpose, the seals and corresponding grooves can be arranged on two different radii.

[0083] Optionally, a first groove with a corresponding seal is arranged in the support surface and a second groove with a corresponding seal is arranged outside the support surface on a radial side of the frame or the electric rotary machine.

[0084] In an advantageous embodiment, the support surface with the recess has a radial extent that is less than half the maximum radial extent of the electric rotary machine.

[0085] The respective radial extent refers to the axis of rotation of the electric rotary machine. This ensures that the support surface is located only in the radially inner region of the electric rotary machine, and therefore has a smaller area than a surface located further radially outwards. Consequently, the area for heat transfer is already reduced in this region. The indentations further reduce this area, thereby further decreasing heat transfer.

[0086] The material forming the support surface can be a material with a thermal conductivity of no more than 230 W / mK.

[0087] This embodiment also allows for a reduction in thermal coupling via the support surface or contact surfaces. P 241512

[0088] - 12 -

[0089] The frame and the electric rotary machine or its machine housing can be made of the same or different materials.

[0090] If necessary, the material with low thermal conductivity can be a separate component, which, however, can be considered a component of the electric rotary machine or the frame in the sense of the invention.

[0091] For example, the material forming the support surface could be an aluminum alloy or steel. The corresponding element forming the support surface may also be a casting.

[0092] It is also possible that at least the support surface of the frame and / or the support surface of the electric rotary machine consists of a material with a thermal conductivity of no more than 5 W / mK, or that a thermal insulation element made of such a material is arranged between the two support surfaces.

[0093] The material could be, for example, a plastic.

[0094] In one embodiment, the support surface of the frame and / or the support surface of the electric rotary machine is made of such a material.

[0095] A thermal insulation element can be, for example, an insulating film or insulating paper.

[0096] The invention also relates to a drive unit comprising a described drive device and a gearbox mechanically connected to or encompassed by the frame. P 241512

[0097] - 13 -

[0098] If necessary, the frame forms at least a portion of a gearbox housing or is mechanically connected to it.

[0099] If a mechanical interface exists between the frame and the gearbox, such as between the frame and a gearbox housing, at least one recess can be provided at this interface in a support surface of the frame and / or gearbox or gearbox housing to reduce the size of the contact area and thus reduce heat transfer. Here, too, such a recess or the space formed by it can be sealed by at least one seal.

[0100] This basic idea can also be applied to other components or assemblies that have a higher temperature during operation than the electric rotary machine, so that the heat input of these other components into the electric rotary machine is reduced.

[0101] The drive unit can be part of a vehicle, such as an electric or partially electric vehicle, possibly capable of autonomous operation.

[0102] It may be provided that at least one recess is connected to a channel in terms of fluid flow, which is fluidly connected to a gearbox chamber of the gearbox, for the purpose of draining any fluid that may have collected in the recess.

[0103] For example, fluid that has entered the depression can be channeled out of the depression and back into the connected gearbox compartment via the formed channel.

[0104] The channel can be designed as a return bore.

[0105] Furthermore, the fluid can be a coolant and / or a lubricant. P 241512

[0106] - 14 -

[0107] For example, the fluid could be oil, which is located in the gearbox for lubrication and / or cooling purposes. In contrast, the electric rotary machine could form an unlubricated, dry chamber.

[0108] The fluid can enter the recess through leaks, such as through screw holes, even in screw connections. This only involves a small amount of fluid, a leak, and not a controlled fluid flow.

[0109] The transmission may include several transmission compartments.

[0110] The channel can be fluidically connected to the same gearbox space from which the intruding fluid originates, although this is not a mandatory embodiment in the sense of the invention.

[0111] If necessary, the fluid is part of a cooling circuit and is cooled by a cooling device, so that oil penetrating the recess transports little or no heat to the electric rotary machine.

[0112] The channel may be configured in such a way that fluid entering the depression flows into the channel and into the fluidically connected gearbox chamber due to gravity. For this to occur, the flow direction defined by the channel may have at least one component in the direction of gravity. Furthermore, the channel may be fluidically connected to the depression in a lower region with respect to gravity, thus facilitating the outflow of fluid.

[0113] In an advantageous embodiment, the channel is arranged such that its opening to the gearbox compartment is located in the so-called “oil shadow”. This means that the channel opening is arranged and oriented in such a way that fluid flowing around or flung around by rotating gearbox components does not enter the channel as far as possible, or only in negligible quantities. For example, P 241512

[0114] - 15 -

[0115] The channel opening can be arranged in the area of ​​an undercut with respect to a rotation direction relevant for the oil distribution of a corresponding transmission component.

[0116] In the case of multiple depressions, each depression can have a channel, regardless of whether the depressions are interconnected or not. In the case of interconnected depressions, only one described channel may be provided.

[0117] 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, and it should be noted that the embodiments shown in the drawings are not limited to the dimensions depicted. It is illustrated in

[0118] Fig. 1: a sectional view of a drive unit, comprising a first embodiment of a drive device;

[0119] Fig. 2: detail A from Fig. 1;

[0120] Fig. 3: Detail B from Fig. 1 with a first embodiment of the frame;

[0121] Fig. 4: a section of a sectional view showing a second embodiment of the frame;

[0122] Fig. 5: a section of an axial view of the first embodiment of the frame;

[0123] Fig. 6: a section of an axial view of a third embodiment of the frame; P 241512

[0124] - 16 -

[0125] Fig. 7: a section of a sectional view of a second embodiment of a drive device; and

[0126] Fig. 8: a section of a sectional view of a third embodiment of a drive device.

[0127] Figure 1 shows a sectional view of a drive unit 1. The drive unit 1 comprises a first embodiment of a drive device 2 and a gearbox, wherein the gearbox is arranged in a gearbox compartment 49 formed by a gearbox housing 40 and is not shown here for clarity. The gearbox housing 41 comprises a first gearbox housing component 42 and a second gearbox housing component 43, wherein the first gearbox housing component 42 is formed by a frame 40 encompassed by the drive device 2. The drive device 2 also comprises an electric rotary machine 10 designed as an axial flux machine 11 with a machine housing 24 designed as a stator housing 12, which is supported axially on the frame 40.The electric rotary machine 10 comprises a stator 15 formed by two stator halves 16, 17 and a rotor 13, the rotor 13 being connected to a rotor shaft 14 for torque transmission. The rotor shaft 14 is rotatably mounted by three rotor shaft bearings 20, 21, 22 and is connected to a gearbox input shaft 44 for torque transmission. The second rotor shaft bearing 21 and the third rotor shaft bearing 22 are connected to the stator housing 12 of the electric rotary machine 10 by a rotor shaft bearing screw connection 23. A gearbox output shaft 45 serves as the output unit of the gearbox (not shown). A first shaft seal 46 is arranged between the gearbox housing 41 and the gearbox input shaft 44, and a second shaft seal 47 is arranged between the gearbox housing 41 and the gearbox output shaft 45 to seal the gearbox housing 41.Furthermore, the drive unit 1 has an electrical voltage connection 18 and an outer housing 50, the outer housing 50 together with the frame 40 forming a machine room 19 for the electric rotary machine 10. P 241512.

[0128] - 17 -

[0129] The axis of rotation 90 corresponds to the axis of rotation of the rotor 13, the rotor shaft 14, the gearbox input shaft 44 and the gearbox output shaft 45.

[0130] Figure 2 shows detail A from Figure 1 in an enlarged view. In the area of ​​the sectional view shown here, the frame 40 of the gearbox housing 41 is axially supported on the machine housing 24 of the electric rotary machine 10, which is designed as the stator housing 12, by a support surface 80 that is perpendicular to the axis of rotation 90 from Figure 1, thus forming a contact area 82. The frame 40 and the electric rotary machine 10 are also fixed to each other and clamped against each other by a screw connection 70 arranged in a through-hole 71 of the frame 40 and screwed into a bore with an internal thread 72 of the stator housing 12. The contact area 82 is sealed fluid-tight on both sides in the radial direction, so that as little fluid as possible, or only a negligible amount, can enter the machine chamber 19 of the electric rotary machine 10 from the gearbox chamber 49.The radial seal is achieved by a first groove 61 and a first seal 60 located in the stator housing of the electric rotary machine 10, and by a second groove 63 and a second seal 62 located in the stator housing 12. The first groove 61 and the first seal 60 are located on a radially outward-facing side of the stator housing 12, while the second groove 63 and the second seal 62 are located on the axial support surface 80 or the contact area 82 of the stator housing 12.

[0131] Figure 3 shows an enlarged view of detail B from Figure 1 with a first embodiment of the frame 40, which is also shown in Figure 1. In the area of ​​the sectional view shown here, the frame 40 of the gearbox housing 41 is axially supported on the machine housing 24 of the electric rotary machine, which is designed as a stator housing 12, by a support surface 80 extending perpendicular to the axis of rotation 90 from Figure 1, wherein a recess 81 is arranged in the frame 40 in the support surface 80. The recess 81 forms a

[0132] - 18 -

[0133] The filled space reduces the effective contact area between the frame 40 and the electric rotary machine 10 and, due to the air, provides thermal insulation, thus preventing heat transfer between the frame 40 and the electric rotary machine 10. The recess 81 is sealed radially on both sides to be fluid-tight, so that fluid from the gearbox chamber 49 can enter the machine chamber 19 of the electric rotary machine 10 either not at all or only in negligible amounts. The radial seal is achieved by the grooves 61, 63 and seals 60, 62 already shown in Figure 2.

[0134] Figure 4 shows an enlarged section of a sectional view of a second embodiment of the frame 40, which is not shown in Figure 1. The basic structure corresponds to that of Figure 3. The only difference is that the frame 40 shown here has a channel 83 designed as a return bore 84, which fluidically connects the recess 81 to the gearbox 49 and is configured to allow fluid that has entered the recess 81 to flow back into the gearbox 49. This ensures that the heat transfer between the frame 40 and the electric rotary machine 10 is not facilitated by fluid located in the recess 81.

[0135] Figure 5 shows a section of an axial view of the first embodiment of the frame 40 from Figures 1 and 3. It should be noted that, for clarity, only the top view of the contact area on the stator housing 12 shown in Figure 1 is shown, and that the sectional view shown in Figure 1 corresponds to the section CC shown here on the frame 40. The frame 40 has twelve unconnected recesses 81 distributed along an annular area extending along its circumference. These recesses are arranged in the axial support surface 80 of the frame 40 such that the recesses 81 and contact areas 82 alternate along the circumference. Therefore, the frame 40 also has a total of twelve contact areas 82 for support against the machine housing of the electric rotary machine, which is not shown here.

[0136] - 19 -

[0137] Furthermore, the installation area 82 has a through-hole 71, each of which is designed to accommodate the screw connection 70 shown in Figure 2.

[0138] Figure 6 shows a section of an axial view of a third embodiment of the frame 40. The basic structure of the frame 40 corresponds to Figures 1, 3, and 5, although the section shown here is somewhat smaller than the section shown in Figure 5. In contrast to Figure 5, here the individual recesses 81 are connected to each other by a respective connecting area 85 on a radially outer side of the support surface 80 and thus form a common recess area 86.

[0139] Figures 7 and 8 show a second and third embodiment of a drive device 2 with different arrangements of the first seal 60 and the first groove 61. The arrangements shown are in principle also applicable to the second seal 62 and second groove 63 from Figures 3 and 4.

[0140] Figure 7 schematically shows a section of a sectional view of a second embodiment of a drive device 2. A frame 40 is supported on an electric rotary machine 10 by a support surface 80, wherein a recess 81 is arranged in the support surface 80 of the frame 40. Within the recess 81, a first groove 61 with a first seal 60 inserted therein is arranged in an end region. The first seal 60 forms a boundary of the space formed by the recess 81 and seals the recess 81 against the electric rotary machine on one side in a fluid-tight manner.

[0141] Figure 8 shows a section of a sectional view of a third embodiment of a drive device 2. A frame 40 is supported on an electric rotary machine 10 by a support surface 80, wherein a recess 81 is arranged in the support surface 80 of the frame 40. Within the recess 81, a first groove 61 with a first seal 60 inserted therein is arranged such that the space formed by the recess 81 is divided into two spaces. The first seal 60 forms a boundary of the space formed by the recess 81.

[0142] - 20 -

[0143] The space and seals the recess 81 against the electric rotary machine 10 in a fluid-tight manner on one side. P 241512

[0144] - 21 -

[0145] Reference symbol list 1 Drive unit

[0146] 2 Drive unit

[0147] 10 Electric Rotary Machine

[0148] 11 Axial flux machine

[0149] 12 Stator housings

[0150] 13 Rotor

[0151] 14 Rotor shaft

[0152] 15 Stator

[0153] 16 First stator half

[0154] 17 Second stator half

[0155] 18 electrical voltage connection

[0156] 19 Engine room

[0157] 20 First rotor shaft bearing

[0158] 21 Second rotor shaft bearing

[0159] 22 Third rotor shaft bearing

[0160] 23 Rotor shaft bearing screw connection

[0161] 24 machine housings

[0162] 30 First cooling channel

[0163] 31 Second cooling channel

[0164] 40 frame

[0165] 41 Gearbox housing

[0166] 42 First gearbox housing component

[0167] 43 Second gearbox housing component

[0168] 44 Gearbox input shaft

[0169] 45 Gearbox output shaft

[0170] 46 First shaft seal

[0171] 47 Second shaft seal

[0172] 49 Gearbox compartment

[0173] 50 outdoor enclosures

[0174] 60 First seal

[0175] 61 First NutP 241512

[0176] - 22 -

[0177] 62 Second seal

[0178] 63 Second groove

[0179] 70 screw connection

[0180] 71 Through hole

[0181] 72 Bore with internal thread 80 Support surface

[0182] 81 In-depth study

[0183] 82 Investment area

[0184] Channel 83

[0185] 84 Return bore

[0186] 85 Connection area

[0187] 86 Specialization area

[0188] 90° axis of rotation

Claims

P 241512 - 23 - Patent claims 1. Drive device (2) comprising an electric rotary machine (10) and a frame (40), wherein the electric rotary machine (10) is mechanically supported by resting against the frame (40), and wherein at least one recess (81) is formed in at least one support surface (80) with which one of the two elements electric rotary machine (10) and frame (40) abuts the other element for mechanical support, in order to space the electric rotary machine (10) and the frame (40) apart in certain areas, wherein the recess (81) forms an empty space.

2. Drive device (2) according to claim 1 , characterized in that the support surface (80) extends in a first plane and a space defined by at least one recess (81) extends between the first plane or a second plane parallel to the first plane, and a further plane parallel to the first plane.

3. Drive device (2) according to one of the preceding claims, characterized in that the electric rotary machine (10) is an axial flux machine (11 ), wherein the stator (15) of the axial flux machine (11 ) is mechanically supported on the frame (40).

4. Drive device (2) according to one of the preceding claims, characterized in that contact areas (82) of the support surface (80) and recesses (81) are arranged alternately on the same radius area on a circumference.

5. Drive device (2) according to claim 4, wherein alternately arranged recesses (81) on at least one radial side of the support surface (80) are connected to each other, so that they form a common recess area (86). P 241512 - 24 - 6. Drive device (2) according to one of the preceding claims, characterized in that a space delimited by the recess (81) and the respective other element is sealed at least on one side by at least one seal (60, 62) arranged in a groove (61, 63).

7. Drive device (2) according to one of the preceding claims, characterized in that the support surface (80) with the recess (81) has a radial extent which is less than half the maximum radial extent of the electric rotary machine (10).

8. Drive device (2) according to one of the preceding claims, characterized in that the material forming the support surface (80) is a material with a thermal conductivity of maximum 230 W / mK.

9. Drive unit (1) comprising a drive device (2) according to any one of claims 1 to 8 and a gearbox mechanically connected to or encompassed by the frame (40).

10. Drive unit (1) according to claim 9, characterized in that a channel (83) is fluidically connected to at least one recess (81) which is fluidically connected to a gear chamber (49) of the gearbox, for the discharge of fluid that may be collected in the recess (81).

Images