Electric machine for generating electrical energy and hybrid drive unit for a vehicle

Abstract

The present invention relates to an electric machine (1) for generating electric energy for a hybrid vehicle, comprising: a housing (2) with an axial opening (E) for mounting a stator arrangement (4) and a rotor arrangement (5) and at least one external housing wall part (3) which separates the electric machine (1) from the surroundings, a stator device (4) arranged inside the housing (2); a rotor arrangement (5) for connection to an internal combustion engine such that the rotational energy of the internal combustion engine can be converted into electrical energy by relative rotation of the rotor arrangement (5) with respect to the stator arrangement (4), -The electric machine (1) comprises a sealing device (6) which seals an axial opening (E) of a housing (2) and divides the interior of the housing (2) in the axial direction (X) into two spatial portions (A, B) such that in the first spatial portion (A) a crankshaft of an internal combustion engine can be connected to a rotor device (5) and a stator device (4) is arranged in the second spatial portion (B). The present invention further relates to a hybrid drive unit and method.

Description

[Technical Field]

[0001] The present invention relates to an electric machine for generating electrical energy for a hybrid vehicle, a hybrid drive unit for the vehicle, and a method for connecting an internal combustion engine to an electric machine.

[0002] In other words, the present invention relates to an apparatus (electric machine) and a method, in particular to a transmission, i.e., a hybrid drive unit, such as a Dedicated Hybrid Transmission (DHT), comprising one or two electric machines for use in a motor vehicle. [Background technology]

[0003] From the unpublished German patent application with application number 10 2020 123 116.4, a transmission with two electric machines is known, as shown in FIGS. 1 and 2 .

[0004] As shown in FIG. 1, a first electric machine 1 is connected as a generator to an internal combustion engine 100 or directly to a crankshaft 101 of the internal combustion engine 100 (only reference numerals are given).

[0005] In this case, the second E-machine, ie the second electric machine 200, is used as a traction or propulsion machine.

[0006] The engine housing 104, ie the housing 104 of the internal combustion engine 100, and the transmission housing 2, ie the housing 2 of the electric machine 1, are screwed together and form a parting plane T.

[0007] The internal combustion engine 100 or internal combustion engine 100 is sealed by a crankshaft seal 105 or radial shaft seal 105 .

[0008] In FIG. 2, an enlarged view of a portion of FIG. 1 is shown.

[0009] The stator 26 of the first electric machine 1 is connected to the transmission housing 2, i.e. to the housing 2 of the electric machine 1, by means of a stator carrier 27, for example via screws S.

[0010] Coolant or cooling water channels 28 , ie cooling channels 28 , are defined by the transmission housing, ie housing 2 of the electric machine 1 , and the stator carrier 27 .

[0011] The rotor 12 of the first electric machine 1 is connected to the crankshaft 101 via a rotor carrier 13 and a screw S.

[0012] The space A, i.e. the first spatial portion A in which the first electric machine 1 is present, is dry and is separated from the wet or oil chamber B of the transmission, i.e. the second spatial portion B, by the transmission housing 2 or housing 2.

[0013] According to the unpublished German patent application with application number 10 2021 108 127.0, a transmission with two electric machines is known, as shown in FIG. 3 .

[0014] As shown in FIG. 3, the rotor 12 of the first electric machine 1 is connected on one side to the crankshaft 101 of an internal combustion engine 100 (only reference numerals are shown) via a rotor carrier 13, screws S, a so-called Flexplate 102, i.e. a flexible disk part 102, and screws S.

[0015] On the other side, axially opposite to the connection of the rotor 12 to the crankshaft 101 , the rotor carrier 13 is supported by a rolling bearing 15 or bearing 15 .

[0016] The space A, i.e. the first spatial portion A of the first electric machine 1, is dry and is separated from the wet or oil chamber B of the transmission, i.e. the second spatial portion B, by the transmission housing 104, i.e. the housing 104 of the internal combustion engine 100 and the radial shaft sealing ring 37.

[0017] In the above-mentioned prior art, the space, i.e. the space portion A, is difficult to seal between the internal combustion engine 100 or the internal combustion engine 100 and the housing 2 of the transmission or electric machine 1, and the water-resistant insulation of the stator 26 of the first electric machine 1 has proven difficult and time-consuming.

[0018] More precisely, in many cases, it is extremely difficult to form the dividing surface T between the engine housing 104, i.e. the housing 104 of the internal combustion engine 100, and the transmission housing 2, i.e. the housing 2 of the electric machine 1, in such a way that a tight sealing surface is created.

[0019] Therefore, for example, when traveling on a flooded road, it is not possible to prevent moisture from entering the space A, that is, the first space portion A.

[0020] In any case, such a configuration of the stator 26 of the first electric machine 1, which is isolated against water and does not pose a risk of short circuits, would certainly be possible in principle, but would be extremely complex in terms of manufacturing technology.

[0021] By screwing the rotor 12 of the first electric machine 1 directly to the crankshaft 101, since the rotor 12 is part of the crankshaft 101 and is first assembled to the stator 26 during assembly, it would be unnecessary to fully test the first electric machine 1 before assembling the transmission / electric machine 1 to the internal combustion engine 100 / 100. However, adjustments to the first electric machine 1, such as for example adjusting the air gap between the stator 26 and the rotor 12, would then have to be made during or after assembling the housing 2 of the transmission / electric machine 1 to the internal combustion engine 100 / 100, which is not necessarily desirable.

[0022] The known transmission input configuration with the gear transmission input shaft and the first electric machine 1 in the oil chamber would require a torsion damper connected to the front due to the play in the gears of the plug-in gears during continuous operation, which would also be costly and require structural space. Summary of the Invention [Problem to be solved by the invention]

[0023] The object of the present invention is therefore to solve the above-mentioned problems in the prior art and to provide an improved device or electric machine and an improved method, in particular an improved transmission or an improved hybrid drive unit with one or two electric machines in a motor vehicle. [Means for solving the problem]

[0024] This problem is solved by the measures presented in the independent claims.

[0025] Further advantageous embodiments of the invention are the subject of the dependent claims.

[0026] In a first aspect, an electric machine for generating electric energy for a hybrid vehicle has a housing with axial openings for mounting a stator device and a rotor device and at least one outer housing wall part separating the electric machine from the surroundings, wherein the housing has a shape similar to a pan, the open side of the pan forming the axial opening or the open side of the pan being axially accessible, for example for mounting the stator device and / or the rotor device.

[0027] Furthermore, the electric machine includes a stator arrangement, which is disposed within the housing.

[0028] Additionally, the electric machine includes a rotor arrangement for connection to the internal combustion engine such that rotational energy of the internal combustion engine can be converted into electrical energy by relative rotation of the rotor arrangement with respect to the stator arrangement.

[0029] The electric machine further includes a sealing device that seals the axial opening of the housing and axially divides the interior of the housing into two spatial sections. In the first spatial section, the crankshaft of the internal combustion engine can be connected to the rotor device, and the stator device is located in the second spatial section. By sealing the axial opening of the housing, water is allowed to enter the first spatial section between the internal combustion engine and the electric machine or the housing of the electric machine without risking damage to the stator device or the stator of the stator device. This is because the sealing device protects the stator or the stator device from water and dirt. On the other hand, the sealing device may require some effort to seal the stator device of the electric machine. Furthermore, the sealing device allows the electric machine to be inspected in the factory before being assembled with the internal combustion engine. As a result, it is also possible to form an electric machine with a housing, which can be inspected before being mounted on an internal combustion engine and is protected from the ingress of water and / or dirt, even when the electric machine is not yet assembled on the internal combustion engine or the housing of this internal combustion engine.

[0030] Furthermore, the sealing device may be arranged inside the housing and extend, for example radially, from at least one outer housing wall part to the rotor device, whereby the rotor device, like the housing, can be made impermeable as a component and thus can seal with itself, preventing the ingress of water and dirt between the housing and the rotor device.

[0031] In that case, the sealing device may be in sealing contact with at least one outer housing wall part and the rotor device, in particular a hub unit of the rotor device.

[0032] The sealing device may be configured so that it can be sandwiched or fitted between at least one outer housing wall part and the rotor device or a hub unit of the rotor device. The sealing device may also be configured so that it can be fitted, clamped, or press-fitted into the housing or into or on the at least one outer housing wall part. This allows fasteners such as screws or rivets to be omitted, thereby reducing weight and facilitating installation by the number of screws required. Furthermore, this allows the sealing device to be arranged non-rotatably relative to the at least one outer housing wall part or the housing.

[0033] The sealing arrangement may include a radial shaft seal, the sealing effectiveness of which increases as the diameter of the radial shaft seal decreases, and the wear impact of the radial shaft seal decreases.

[0034] The radial shaft seal may be located on the sealing surface of the hub unit of the rotor device, such interaction providing optimal sealing.

[0035] Furthermore, the sealing device may have a molded sealing element, which may be formed to extend in a funnel shape.

[0036] The sealing element may form a mount for the housing at an end of the sealing element, viewed radially outward, or at an end of the sealing element located radially outward.

[0037] Furthermore, the sealing element may have threaded or rivet openings at its radially outer end, so that a friction-lock or form-lock connection can be created between the sealing element and the housing of the electric machine, for example by means of a screw, thereby increasing the sealing effect and securing the position.

[0038] Additionally, the sealing element may form a mount for the radial shaft seal of the sealing device at its end or at its radially inner end, viewed radially inward, and may be configured such that the radial shaft seal is tensioned against the sealing surface of the hub unit of the rotor device by a pretensioning force, which ensures a more reliable contact of the radial shaft seal with the associated sealing surface, thereby improving the performance of the seal.

[0039] The rotor device may also have a rotor and a rotor carrier, the rotor and rotor carrier being connected together so as not to rotate relative to each other.

[0040] The rotor may be arranged on a rotor carrier on the outside when viewed in the radial direction, and the hub unit or rotor carrier may have a bearing mount for a bearing on the inside when viewed in the radial direction, which can absorb the forces of the rotor device and, together with the bearing, ensure the rotation of the rotor device.

[0041] Furthermore, the rotor device may have bearings arranged in bearing mounts of the rotor carrier, which make it possible to absorb the forces of the rotor device and ensure the rotation of the rotor device.

[0042] The rotor arrangement may also have a connection piece configured for connection to a crankshaft of an internal combustion engine.

[0043] The connecting piece may have, viewed radially outward, at least one internal thread on the outside of the connecting piece or on the radially outside of the connecting piece for connection to a crankshaft of an internal combustion engine.

[0044] In addition, the connecting piece may have at least one penetration, viewed radially inward, on the inside of the connecting piece or on the radial inside of the connecting piece for a friction-fit and / or form-fit connection with the hub unit of the rotor device.

[0045] The connecting piece may have a shape reminiscent of a soup bowl, which provides sufficient mechanical stability and allows easy drainage of water.

[0046] Furthermore, the rotor device may have a hub unit to which a rotor carrier of the rotor device is fixed so as not to rotate relative to the hub unit, and the rotor carrier is formed to arrange the rotor of the rotor device so as not to rotate relative to the hub unit.

[0047] The rotor device may also have a hub unit, in which, additionally or alternatively, a connecting part of the rotor device is fixed non-rotatably relative to the rotor carrier of the rotor device, the connecting part being formed for connection to the crankshaft.

[0048] Furthermore, the hub unit may have a sealing surface for a radial shaft seal of the sealing device, thereby improving the sealing performance of the sealing device.

[0049] The sealing surface may be disposed between the rotor carrier of the rotor device and the connecting part of the rotor device, such that the rotor carrier can be disposed in the second spatial portion and the connecting part can be disposed in the first spatial portion, the two spatial portions being sealed from each other using the sealing device, so that water and dirt cannot reach one spatial portion from the other spatial portion.

[0050] In addition, the sealing surface can be formed from a shoulder of the hub unit, which ensures that the sealing surface can be produced in a simple manner.

[0051] Furthermore, the hub unit has shoulders, and the connecting parts contact opposite these shoulders on one side and the other side of the rotor carrier, so that the crankshaft of the internal combustion engine can be connected to the rotor carrier via the connecting parts and the hub unit.

[0052] The shoulder projects radially outwards, so that the sealing surface formed on this shoulder can be finished in a simple manner.

[0053] The shoulder may have, for example, a plurality of through holes in the axial direction, in each of which one rivet or screw is arranged, which rivet or screw connects the connecting parts of the hub unit and / or the rotor carrier and / or the rotor device together in a manner that prevents relative rotation.

[0054] In addition, the hub unit has teeth with which the rotor carrier engages with corresponding counter teeth, in which case the teeth and the counter teeth may be formed without play.

[0055] The hub unit also has a shaft-hub connection with the rotor carrier, which ensures a non-rotatable connection between the hub unit and the rotor carrier.

[0056] Additionally, the rotor carrier may be tensioned against the shoulder using a shaft nut, in which case the rotor carrier may be tensioned against the shoulder using a shaft nut via the bearing and sleeve.

[0057] Thereby, an improved bearing pretension for operation can be achieved.

[0058] Additionally, the rotor device bearings may be secured to the rotor carrier using circlips.

[0059] Additionally, at least one outer housing wall part may be configured for locating a stator device.

[0060] The stator device may include a stator and a stator carrier, the stator being fixed radially inwardly to the stator carrier and the stator carrier being arranged radially outwardly on at least one housing wall part.

[0061] A cooling channel may be formed between the stator carrier and the at least one housing wall component for removing operating heat from the stator.

[0062] The stator carrier may then be formed as a hollow cylinder.

[0063] The stator carrier may also have at least one shoulder against which it abuts against a shoulder of at least one outer housing wall part.

[0064] The stator carrier may additionally have one or more grooves on the radially outer side for mounting sealing elements, thereby enabling the cooling channels to be sealed in the axial direction.

[0065] Additionally, the stator carrier includes a sealing element disposed in a groove of the stator carrier.

[0066] In addition, in order to screw the stator carrier to at least one outer housing wall part, the stator carrier has at least one through-hole, for example in the axial direction, which through-hole is arranged radially outward.

[0067] The at least one penetration may be formed in a shoulder against which the stator carrier abuts against a shoulder of the at least one outer housing wall part.

[0068] To secure the stator carrier to the housing, at least one outer housing wall part includes at least one internal thread, into which one screw is threaded respectively.

[0069] Furthermore, the stator carrier has a chamfer at its axial end or at its end as viewed in the axial direction, in which the seal is arranged between the stator carrier and the sealing device or the sealing element of this sealing device, thereby improving the sealing performance.

[0070] Finally, it is further mentioned that the electric machine is configured to generate electrical energy, for example to charge a battery and / or to supply energy to an electric motor.

[0071] Furthermore, it should be noted that the axis of the penetration or through-hole may extend in an axial direction.

[0072] A second aspect of the invention includes a hybrid drive unit for a vehicle.

[0073] It is expressly pointed out that the features of the electric machines as described in the first aspect can find application in hybrid drive units for vehicles, either alone or in combination with one another.

[0074] In other words, features relating to the electric machine described in the first aspect of the invention above may be combined with other features described herein in the second aspect of the invention.

[0075] The hybrid drive unit for a vehicle includes an electric machine according to the first aspect and an internal combustion engine with a crankshaft and a flexible disk component. Of course, the hybrid drive may also have a first electric machine and a second electric machine, where the first machine is used as a generator and the second electric machine is used as a vehicle drive. In that case, the hybrid drive may be configured as a so-called series drive, where one electric machine operates as a generator and the other machine operates as a vehicle drive.

[0076] The flexible disk component is arranged non-rotatably relative to the crankshaft and non-rotatably relative to the connecting component of the rotor device of the electric machine, so that the rotational energy of the internal combustion engine can be transmitted via the crankshaft, the flexible disk component and the connecting component to the hub component and via the rotor carrier to the rotor, converting mechanical energy into electrical energy.

[0077] In that case, the flexible disc component may be secured to the crankshaft using screws.

[0078] Furthermore, in order to connect the flexible disk part to a connecting part of a rotor device of an electric machine, the flexible disk part has at least one through-hole on the outside of the flexible disk part, seen radially outward or radially outside the flexible disk part, through which a screw can pass.

[0079] Additionally, the internal combustion engine may include a housing and a radial shaft seal that seals the interior of the housing from the exterior.

[0080] Finally, it should be noted that the axis of the penetration or through-hole may extend in an axial direction.

[0081] A third aspect of the invention includes a method for connecting an internal combustion engine to an electric machine.

[0082] It is expressly pointed out that the features of the vehicle hybrid drive unit as described in the second aspect can find application, either alone or in combination with one another, in a method for connecting an internal combustion engine to an electric machine.

[0083] In other words, the features of the hybrid drive unit for a vehicle described in the second aspect of the invention above may be combined with other features described herein in the third aspect of the invention.

[0084] A method for connecting an internal combustion engine to an electric machine forms a hybrid drive unit as described in the second aspect.

[0085] The method may include the following steps:

[0086] One step involves axially aligning the crankshaft of the internal combustion engine and the electric machine on a common axis of rotation to form a hybrid drive unit, as described in the second aspect.

[0087] On this basis, the housing of the electric machine and the housing of the internal combustion engine can be connected to one another.

[0088] This may then be followed by a step of connecting the connecting part of the rotor device of the electric machine to the flexible disc part of the internal combustion engine using screws.

[0089] A further step may include aligning the penetration of the flexible disk part with the internal thread of the connecting part before connecting the connecting part to the flexible disk part, so that the connecting part and the flexible disk part can be screwed together using a screw that can pass axially through the opening or through an axial opening in the housing of the internal combustion engine. Such a step is found, for example, when assembling or connecting prior art automatic converters.

[0090] The inventive idea described above will now be fully restated.

[0091] Thereby, a sealing plate or a sealing device is provided between the rotor of the first electric machine and the internal combustion engine or engines.

[0092] A play-free, non-rotatable connection of the rotor of the first electric machine with the crankshaft of the internal combustion engine may be provided.

[0093] The drive plate / flywheel or connecting piece may be connected to the crankshaft using a flexible disc or Flexplate or flexible disc piece.

[0094] The drive plate / flywheel or connecting piece may be connected to the rotor of the first electric machine via a radial small hub / hub unit.

[0095] The radial shaft seal ring or seal may seal at a minimum diameter against the hub / hub unit.

[0096] The not completely sealable space / first space portion between the internal combustion engine or the internal combustion engine and the transmission or the electric machine is separated from the sealed space or oil chamber or second space portion.

[0097] From the above possible embodiments, several advantageous effects of the present invention become apparent.

[0098] The previously described solution illustrates the following advantages: a direct, play-free, non-rotatable connection of the rotor of the first electric machine with the crankshaft; - No intermediate connection of the torsion damper - No dedicated insulation costs for the stator of the first electric machine allowing water and / or other foreign matter / dirt to enter the space between the internal combustion engine and the transmission without fouling or damaging the first electric machine; -During or after the assembly of the transmission, a final check of the transmission or electric machine, including the functioning of the first electric machine, and adjustment if necessary.

[0099] The invention will now be described in detail based on two embodiments in conjunction with the accompanying drawings. [Brief explanation of the drawings]

[0100] [Figure 1] 1 is a cross-sectional view of a transmission with two electric machines according to the prior art; [Figure 2] FIG. 2 is an enlarged view of a portion of FIG. [Figure 3] 1 is a cross-sectional view of a further transmission with two electric machines according to the prior art; [Figure 4] 1 is a cross-sectional view of an electric machine for generating electrical energy for a hybrid vehicle according to a first embodiment; [Figure 5] 4 is a cross-sectional view of an electric machine for generating electrical energy for a hybrid vehicle according to a second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0101] In the following description, the same reference numerals are used for the same objects.

[0102] 1 to 3 show cross-sectional views of an embodiment according to the prior art, which has already been described in detail at the beginning of this specification and will not be further described here.

[0103] In FIG. 4 a cross-sectional view of an electric machine 1 for generating electrical energy for a hybrid vehicle according to a first embodiment is shown.

[0104] The electric machine 1 has, according to FIG. 4 , a housing 2 with an axial opening E in the direction X, in particular with an axial opening E for mounting a stator arrangement 4 and a rotor arrangement 5, and an outer housing wall part 3 which separates the electric machine 1 from the surroundings.

[0105] Furthermore, the electric machine 1 comprises a stator arrangement 4 arranged inside the housing 2 and a rotor arrangement 5 for connection to an internal combustion engine 100 (only reference numerals are shown), whereby the rotational energy of the internal combustion engine 100 can be converted into electrical energy by relative rotation of the rotor arrangement 5 with respect to the stator arrangement 4.

[0106] Furthermore, as can be seen from FIG. 4 , the electric machine 1 has a sealing device 6 which seals an axial opening E of the housing 2 and divides the interior of the housing 2 in the axial direction X into two spatial portions A and B, such that in the first spatial portion A the crankshaft 101 of the internal combustion engine 100 can be connected to the rotor device 5, and the stator device 4 is arranged in the second spatial portion B.

[0107] By sealing the axial opening E of the housing 2, water is permitted to enter the first spatial portion A between the internal combustion engine 100 and the electric machine 1 or the housing 2 of the electric machine 1, for example, through the opening O, because the sealing device 6 protects the stator 26 of the stator device 4 from water and dirt. Additionally, the sealing device 6 may require a slightly more complex sealing of the stator device 4 of the electric machine 1. The sealing device 6 also allows the electric machine 1 to be inspected in the factory before assembly with the internal combustion engine 100. This results in a fully sealed and pre-inspected electric machine 1 that can be tested before being installed in the internal combustion engine and is protected against the ingress of water and / or dirt, even before the electric machine 1 is assembled in the internal combustion engine 100 or the housing 104 of the internal combustion engine 100. Consequently, sealing at the dividing plane T is not necessary.

[0108] As shown in FIG. 4, the sealing device 6 is arranged inside the housing 2 and extends from the outer housing wall part 3, for example inward in the radial direction Y, to the rotor device 5 or to the hub unit 19 of this rotor device 5.

[0109] In that case, the sealing device 6 is in sealing contact with at least one outer housing wall part 3 and with the rotor device 5 , in particular with the hub unit 19 of the rotor device 5 .

[0110] Furthermore, FIG. 4 shows that the sealing device 6 has a radial shaft seal 7 which is arranged on a sealing surface 20 of a hub unit 19 of the rotor device 5 .

[0111] In this case, the sealing device 6 has a molded sealing element 8 which is formed in a funnel-like shape and which, at its end or at its radially outer end, when viewed outward in the radial direction Y, forms a mount 9 for the housing 2, and at its radially outer end, the sealing element 8 has a through-hole 10 for a screw S or a rivet, so that a friction-locking or form-locking connection can be formed between the sealing element 8 and the housing 2. In this way, the sealing device 6 or molded sealing element 8 is arranged rotationally fixed on the housing 2.

[0112] Furthermore, the sealing element 8 forms, at its end or at its end located radially inward, a mount 11 for the radial shaft seal 7 of the sealing device 6, which is formed so that the radial shaft seal 7 is pretensioned against the sealing surface 20 of the hub unit 19 of the rotor device 5.

[0113] Furthermore, as can be seen from FIG. 4, the rotor device 5 comprises a rotor 12 and a rotor carrier 13, which are connected together so as not to rotate relative to each other.

[0114] The rotor 12 is arranged on the outside of the rotor carrier 13 when viewed in the radial direction Y, and the rotor carrier 13 has on its inside, when viewed in the radial direction Y, bearing mounts 14 for bearings 15. The bearing mounts 14 can then receive the forces of the rotor device 5 and, together with the bearings 15, ensure the rotation of the rotor device 5. In addition, the rotor device 5 has the bearings 15, as described above, which are arranged in the bearing mounts 14 of the rotor carrier 13.

[0115] The rotor arrangement 5 also comprises a connection piece 16 which is designed for connection to a crankshaft 101 of an internal combustion engine 100 .

[0116] The connecting part 16 has, on the outside of the connecting part 16 , i.e., on the radially outer side of the connecting part 16 , a plurality of internal threads 17 for connection to the crankshaft 101 of the internal combustion engine 100 , as viewed outward in the radial direction Y.

[0117] Furthermore, the connecting piece 16, viewed inward in the radial direction Y, has a number of penetrations 18 on the inside of the connecting piece 16 or on the radial inside of the connecting piece 16 for a friction-lock and / or form-lock connection with a hub unit 19 of the rotor arrangement 5. In that case, the connecting piece 16 has a shape reminiscent of a soup bowl.

[0118] Furthermore, FIG. 4 shows that the rotor device 5 includes a hub unit 19 to which the rotor carrier 13 of the rotor device 5 is fixed so as not to rotate relative to the hub unit 19, and the rotor carrier 13 is formed to arrange the rotor 12 of the rotor device 5 so as not to rotate relative to the hub unit 19.

[0119] In addition, a connecting part 16 of the rotor arrangement 5 is fixed to the hub unit 19 in a manner that prevents it from rotating relative to the hub unit 19, and this connecting part 16 is designed for connection to a crankshaft 101.

[0120] The hub unit 19 has a sealing surface 20 for the radial shaft seal 7 of the sealing device 6 , which sealing surface 20 is arranged between the rotor carrier 13 and the connecting piece 16 .

[0121] The sealing surface 20 is then formed by a shoulder 21 of the hub unit 19 against which the connecting piece 16 rests on one side of the rotor carrier 13 and on the other side. This allows the crankshaft 101 of the internal combustion engine 100 to be connected to the rotor carrier 13 via the connecting piece 16 and via the hub unit 19.

[0122] 4, the shoulder 21 of the hub unit 19 has a number of through holes 22, in each of which a rivet N is arranged, which rivet N connects the hub unit 19 and the connecting part 16 of the rotor device 5 together in a non-rotatable manner. In this case, the shoulder 21 projects outward when viewed in the radial direction Y. In this way, the sealing surface 20 formed on this shoulder 21 can be finished in a simple manner.

[0123] 4, the hub unit 19 also has a gear cutting portion 23, and the rotor carrier 13 engages with this gear cutting portion 23 at a corresponding counter gear cutting portion 23. The gear cutting portion 23 and the counter gear cutting portion 23 are formed without play.

[0124] More precisely, the hub unit 19 has a shaft-hub connection together with the rotor carrier 13, by means of which a non-rotatable connection between the hub unit 19 and the rotor carrier 13 is ensured.

[0125] As can also be seen in FIG. 4, the rotor carrier 13 is tensioned against the shoulder 21 via the bearing 15 and sleeve using the shaft nut 24 .

[0126] FIG. 4 also shows that the outer housing wall part 3 is formed for arranging a stator device 4, the stator device 4 having a stator 26 and a stator carrier 27, the stator 26 being fixed to the stator carrier 27 radially inward, and the stator carrier 27 being arranged radially outward on at least one housing wall part 3.

[0127] To remove the operating heat of the stator 26, a cooling channel 28 is formed between the stator carrier 27 and the housing wall part 3.

[0128] In that case, the stator carrier 27 is formed as a hollow cylinder and has a shoulder 29 against which it rests against a shoulder 30 of the outer housing wall part 3.

[0129] Furthermore, the stator carrier 27 has, on its radially outer side, a number of grooves 31 for mounting sealing elements 32, so that the cooling channels 28 can be sealed in the axial direction X. The aforementioned sealing elements 32 of the stator carrier 27 are arranged in the grooves 31 of this stator carrier 27.

[0130] In order to screw the stator carrier 27 to the outer housing wall part 3, the stator carrier 27 additionally has several penetrations 33 in the axial direction X, which are arranged on the outside as viewed in the radial direction Y.

[0131] A shoulder of the stator carrier 27 abuts a penetration 33 in the outer housing wall part 3 .

[0132] The outer housing wall part 3 then has a number of internal threads 34 into which one screw S is screwed in each case to fasten the stator carrier 27 to the housing 2 .

[0133] Furthermore, in Figure 4 it can be seen that the stator carrier 27 has a chamfer 35 at its axial end, or end as viewed in the axial direction X, in which chamfer 35 a seal 36 is arranged between the stator carrier 27 and the sealing device 6 or the sealing element 8 of this sealing device 6, which allows for improved sealing.

[0134] In summary, it can now be seen that using an embodiment of the electric machine 1, two spatial portions A, B can be sealed from each other with the sealing device 6 as described above, so that dirt and water can reach spatial portion A from spatial portion B and vice versa.

[0135] Essentially, in FIG. 4 not only an electric machine 1 but also, to be precise, a hybrid drive unit for a vehicle is shown.

[0136] This hybrid drive unit comprises, as described above, an electric machine 1 and an internal combustion engine 100 (reference numerals only) with a crankshaft 101 and a flexible disc element 102 .

[0137] As shown in FIG. 4, the flexible disk part 102 is arranged non-rotatably relative to the crankshaft 101 and to the connecting part 16 of the rotor device 5 of the electric machine 1, so that the rotational energy of the internal combustion engine 100 can be transmitted via the crankshaft 101, the flexible disk part 102 and the connecting part 16 to the hub part 19 and via the rotor carrier 13 to the rotor 12, converting the mechanical energy into electrical energy.

[0138] The flexible disk part 102 is fixed to the crankshaft 101 using screws S, and the flexible disk part 102 has a plurality of through-holes 103 on the outside of the flexible disk part 102, when viewed outward in the radial direction Y or on the radially outer side of the flexible disk part 102, through which the screws S pass. Thereby, the flexible disk part 102 is connected to the connecting part 16 of the rotor device 5.

[0139] FIG. 4 also shows that the internal combustion engine 100 has a housing 104 and a radial shaft seal 105 that seals the interior of the housing 104 from the exterior.

[0140] Due to the arrangement of the two housings 2, 104 at the dividing plane T, a first spatial portion A is delimited from the housing of the electric machine 1 on the one hand and the housing 104 of the internal combustion engine 100 on the other hand.

[0141] The sealing of the two housings which abut against each other at the dividing plane T can thereby be omitted or can be achieved with little effort, since the complete sealing of the second space portion B in which the stator is arranged is already achieved by the sealing device 6.

[0142] In the following, a method for connecting the internal combustion engine 100 to the electric machine 1 will be explained in more detail.

[0143] Thereby, firstly, the crankshaft 101 of the internal combustion engine 100 and the electric machine 1 are axially aligned on a common axis of rotation, and then the housing 2 of the electric machine 1 and the housing 104 of the internal combustion engine 100 are interconnected, with the two housings 2, 104 then facing each other at the dividing plane T.

[0144] Thereafter, the connecting part 16 of the rotor arrangement 5 of the electric machine 1 is connected to the flexible disk part 102 of the internal combustion engine 100 using screws.

[0145] For this purpose, before connecting the connecting part 16 to the flexible disk part 102, the female thread 17 of the connecting part 16 is used to align the through-hole 103 of the flexible disk part 102. In this way, the connecting part 16 and the flexible disk part 102 can be screwed together using a screw S which can penetrate an axial opening or an axial opening (not shown) in the housing 104 of the internal combustion engine 100. In modern connections of automatic converters, a similar assembly occurs.

[0146] In FIG. 5 a cross-sectional view of an electric machine 1 for generating electrical energy for a hybrid vehicle is shown according to a second embodiment.

[0147] 4 and the first embodiment, and based on FIG. 5, the electric machine 1 has a housing 2 with an axial opening E in the direction X, in particular with an axial opening E for mounting a stator arrangement 4 and a rotor arrangement 5, and an outer housing wall part 3 that separates the electric machine 1 from the surroundings.

[0148] Furthermore, the electric machine 1 has a stator arrangement 4 arranged inside the housing 2 .

[0149] In addition, the electric machine 1 has a rotor arrangement 5 for connection to the internal combustion engine 100 (shown only by reference number) so that the rotational energy of the internal combustion engine 100 can be converted into electrical energy by relative rotation of the rotor arrangement 5 with respect to the stator arrangement 4.

[0150] According to FIG. 5, the electric machine 1 has a sealing device 6 which seals an axial opening E of the housing 2 and divides the interior of the housing 2 in the axial direction X into two spatial portions A and B, such that in the first spatial portion A the crankshaft of the internal combustion engine 100 can be connected to the rotor device 5, and the stator device 4 is arranged in the second spatial portion B.

[0151] By sealing the axial opening E of the housing 2, on the one hand, water is allowed to penetrate into the first spatial portion A between the internal combustion engine 100 and the electric machine 1 or the housing 2, 104 of the electric machine 1 without risking damage to the stator arrangement 4 or the stator 26 of the stator arrangement 4, because the sealing arrangement 6 protects the stator 26 or the stator arrangement 4 from water and dirt. On the other hand, the sealing arrangement 6 may make it possible to slightly increase the sealing effort of the stator arrangement 4 of the electric machine 1. Furthermore, the sealing arrangement 6 can be used to inspect the electric machine 1 in a factory before assembling the internal combustion engine 100. As a result, an electric machine 1 with the housing 2 can be formed, which can be tested before being installed in the internal combustion engine and is protected from the ingress of water and / or dirt, even when the electric machine 1 is not assembled in the internal combustion engine 100 or the housing 104 of the internal combustion engine 100.

[0152] For further implementations, in order to avoid unnecessary repetition, reference is made to the first embodiment according to FIG. 4, which is also applicable here.

[0153] Therefore, only the differences between the first and second embodiments will be described below.

[0154] Firstly, it should be noted that in comparing Figures 4 and 5, essentially two specific differences can be identified: one relating to the hub unit 19 and the other relating to the fixing of the sealing device 6 on the outer housing wall part 3.

[0155] In Figure 4, the molded sealing element 8, viewed outwards in the radial direction Y, has at its end, more particularly at the end located radially outwards of the sealing element 8, a through-hole 10 for a screw S or a rivet, which can form a friction-fit or form-fit connection between the sealing element 8 and the housing 2.

[0156] This penetration 10 is absent in the second embodiment according to Fig. 5. Thus, in the second embodiment, the sealing device 6 is not fixed to the housing 2 by screws, but instead is clamped, press-fitted or snap-fitted into the housing 2. In this way, the sealing device 6 or molded sealing element 8 is rotationally fixedly arranged in the housing 2. Furthermore, fasteners such as screws or rivets can be omitted, which can reduce weight and facilitate installation.

[0157] Conversely, in both embodiments, the stator carrier 27 has a chamfer 35 at its axial end, or end as viewed in the axial direction, in which a seal 36 is arranged between the stator carrier 27 and the sealing device 6.

[0158] Further specific differences between the first embodiment according to FIG. 4 and the second embodiment according to FIG. 5 can be distinguished in the area of ​​the hub unit 19.

[0159] In Figure 5 as well as in Figure 4, the rotor device 5 includes a hub unit 19 to which the rotor carrier 13 of the rotor device 5 is fixed so as not to rotate relative to it, and the rotor carrier 13 is formed to arrange the rotor 12 of the rotor device 5 so as not to rotate relative to it.

[0160] Furthermore, a connecting part 16 of the rotor device 5 is fixed to the hub unit 19 so as not to be rotatable relative to it, and this connecting part 16 is designed for connection to a crankshaft 101 .

[0161] The hub unit 19 has a sealing surface 20 for the radial shaft seal 7 , which sealing surface 20 is arranged between the rotor carrier 13 of the rotor arrangement 5 and the connecting part 16 of the rotor arrangement 5 .

[0162] In this case, the sealing surface 20 is formed from a shoulder 21 of the hub unit 19, against which the connecting part 16 contacts on one side and on the other side of the rotor carrier 13, so that the crankshaft 101 of the internal combustion engine 100 can be connected to the rotor carrier 13 via the connecting part 16 and via the hub unit 19.

[0163] Here, in FIG. 4, the shoulder portion 21 has a plurality of through holes 22, each of which has one rivet disposed therein, whereas in FIG. 5, a screw S is disposed in each of the through holes 22.

[0164] The screws S connect the hub unit 19, the rotor carrier 13 and the connecting parts 16 of the rotor arrangement 5 together in a non-rotatable manner.

[0165] The toothed portion 23 of the hub unit 19, as shown in FIG. 4, is absent for the second embodiment according to FIG.

[0166] Furthermore, in FIG. 5 the bearings 15 of the rotor arrangement 5 are secured to the rotor carrier 13 using circlips 25, whereas in FIG. 4 the rotor carrier 13 is tensioned against shoulder 21 using shaft nuts 24.

[0167] The drawings will be restated below.

[0168] The invention will therefore be explained again in detail and anew below on the basis of a description of an embodiment and with reference to the accompanying drawings, in which: FIG.

[0169] FIG. 1 is a schematic diagram of a transmission with two electric machines according to the prior art. FIG. 2 is an enlarged schematic view of a portion of FIG. FIG. 3 is a cross-sectional view similar to FIG. 2 of a further transmission with two electric machines according to the prior art. FIG. 4 is a schematic diagram of a part of a transmission with two electric machines according to a first embodiment. FIG. 5 is a schematic diagram of a part of a transmission with two electric machines according to a second embodiment.

[0170] The first embodiment will be described below.

[0171] In FIG. 4, a schematic diagram of a part of a transmission with two electric machines according to a first embodiment is shown.

[0172] As shown in Figure 4, an axial flexible plate or Flexplate or flexible disc component 102 is connected to a crankshaft 101 via a screw S and is part of an internal combustion engine or internal combustion engine 100 (reference numeral only).

[0173] The stator 26 of the first electric machine 1 is connected to the transmission housing 2, i.e. to the housing 2 of the electric machine 1, by means of a stator carrier 27, for example via screws S.

[0174] Coolant or water channels, ie cooling channels 28 , are defined by the transmission housing 2 , ie the housing 2 of the electric machine 1 , and the stator carrier 27 .

[0175] The rotor 12, or as shown in detail the rotor carrier 13 of the first electric machine 1, is non-rotatably connected to the smallest possible hub or hub unit 19 via gear teeth 23 with zero play.

[0176] The rotor 12 of the first electric machine 1 is supported in the transmission housing 2 , ie the housing of the electric machine 1 , via a rolling bearing, ie bearing 15 .

[0177] The rolling bearing / bearing 15 is axially fixed on the hub / hub unit 19, for example via a nut, i.e. a shaft nut 24.

[0178] The hub / hub unit 19 is connected to the drive plate / flywheel, i.e. the connecting piece 16, via rivets N.

[0179] Between the drive plate / flywheel, i.e., connecting piece 16, and the rotor 12, there is a sealing plate, i.e., sealing element 8, which allows for the separation between an unsealed or non-sealable space A, i.e., a first space portion A, and a sealed space B, i.e., a second space portion B.

[0180] Internally, the seal plate or sealing element 8 supports the radial shaft sealing ring or radial shaft seal 7 for sealing against the hub / hub unit 19, and externally, in this example, an O-ring or seal 36 is shown, which enables sealing against the outer housing wall part 3 of the transmission housing or housing 2 of the electric machine 1. Other sealing methods are also possible. Likewise, the shown fixing of the seal plate or sealing element 8 via screws S is merely exemplary. Other solutions are possible, such as, for example, crimping the seal plate or sealing element 8 in the transmission housing or in the outer housing wall part 3 of the housing 2 of the electric machine 1 (see FIG. 5).

[0181] Because the sealing plate, i.e., sealing element 8, separates the non-sealable or unsealed area A, i.e., the first spatial portion A, from the sealed area B, i.e., the second spatial portion B, the opening O in the housing allows water and / or other dirt or foreign matter to enter the non-sealable or unsealed space A, i.e., the first spatial portion A, without this damaging or soiling the first electric machine 1.

[0182] It should be noted that even if no explicit opening O is provided, no sealing is required between the transmission housing, i.e. the housing 2 of the electric machine 1 and the engine housing 104 or the internal combustion engine / housing 104 of the internal combustion engine 100, since the sealing plate / sealing element 8 prevents damage or contamination to the first electric machine 1 if water and / or other dirt, i.e. foreign matter, enters the unsealable or unsealed space A / first space portion A through the gap between the transmission housing 2 / housing 2 and the engine housing / internal combustion engine 100 or housing 104 of the internal combustion engine 100.

[0183] Therefore, sealing against the outer periphery of the space A / first space portion A formed by the transmission housing 2, i.e. housing 2, the engine housing 104, i.e. housing 104 and the seal plate 8, i.e. seal element 8, is explicitly omitted.

[0184] The second embodiment will be described below.

[0185] It should be noted that the second embodiment is identical to the first embodiment except for the differences or modifications described below.

[0186] In FIG. 5 a schematic diagram of a part of a transmission with two electric machines according to a second embodiment is shown.

[0187] The drive plate / flywheel, i.e., connecting piece 16, rotor carrier 13 and hub or hub unit 19 are connected together via screws S.

[0188] It is equally possible to connect the hub / hub unit 19 to the rotor carrier 13, for example by riveting, and to screw only the drive plate / flywheel, i.e. the connecting piece 16, to the hub or hub unit 19.

[0189] In the two embodiments described above, the connection of the first electric machine 1 to the crankshaft 101 is made after fastening the transmission or electric machine 1 to the internal combustion engine 100 or internal combustion engine 100 (only reference numbers are shown) via screws S.

[0190] The above-described embodiments illustrate the following advantages: - a direct connection of the rotor 12 of the first electric machine 1 to the crankshaft 101 without play and without relative rotation - No intermediate connection of the torsion damper - no need for dedicated insulation for the stator 26 of the first electric machine 1; allowing water and / or other foreign matter / dirt to penetrate into the internal combustion engine 100 or the space between the internal combustion engine 100 and the transmission or the electric machine 1 or the first spatial portion A without fouling or damaging the first electric machine 1; - During or after the assembly of the transmission / electric machine 1, a final check of the transmission or electric machine 1, including the functioning of the first electric machine 1, and adjustment if necessary

[0191] Although the present invention has been described above based on the description of the embodiments, it should be understood that various embodiments and modifications can be made without departing from the scope of the present invention, as defined in the appended claims.

[0192] Further features and advantages of the present invention are clearly shown in the disclosed drawings. [Explanation of symbols]

[0193] 1 Electrical Machinery 2. Housing 3 Outer housing wall parts 4 Stator device 5 Rotor device 6 Sealing device 7 Radial Shaft Seal 8 Molded sealing elements 9 Mount 10 Penetration 11 Mount 12 rotor 13 Rotor carrier 14 Bearing mount 15 Bearings 16 Connecting parts 17 female thread 18 Penetration 19 Hub unit 20 sealing surface 21 Hub unit shoulder 22 through holes 23 Gear cutting part / opposing gear cutting part 24 Shaft nut 25 Circlip 26 Stator 27 Stator Carrier 28 cooling channels 29 Stator carrier shoulder 30 outer housing wall part shoulder 31 Groove 32 sealing elements 33 Penetration 34 Female thread on outer housing wall part 35 Chamfered part 36 stickers 37 Radial shaft seal ring 100 Internal combustion engine 101 crankshaft 102 Flexible disc parts 103 Penetration 104 Housing 105 Radial Shaft Seal A First space (E machine room) B Second space (oil chamber) X-axis direction Y radial direction E Opening N Rivet S screw T split plane O opening

Claims

1. An electric machine (1) for generating electrical energy for a hybrid vehicle, comprising: a housing (2) with an axial opening (E) for mounting a stator device (4) and a rotor device (5) and at least one external housing wall part (3) that delimits said electric machine (1) from the surroundings; - a stator device (4) placed inside said housing (2); a rotor arrangement (5) for connection to an internal combustion engine (100) so that the rotational energy of said internal combustion engine (100) can be converted into electrical energy by relative rotation of said rotor arrangement (5) with respect to said stator arrangement (4), the electric machine (1) comprises a sealing device (6) that seals the axial opening (E) of the housing (2) and divides the interior of the housing (2) in the axial direction (X) into two spatial portions (A, B), so that in the first spatial portion (A) the crankshaft of an internal combustion engine (100) can be connected to the rotor device (5) and the stator device (4) is arranged in the second spatial portion (B); - the rotor device (5) comprises a rotor (12) and a rotor carrier (13), the rotor (12) and the rotor carrier (13) being connected so as not to rotate relative to each other; - said rotor device (5) has a connection part (16) which is designed for connection to a crankshaft (101) of an internal combustion engine (100); - the connecting piece (16) has at least one through-hole (18) radially inside the connecting piece (16) for a friction-lock and / or form-lock connection with a hub unit (19) of the rotor device (5), - said at least one outer housing wall part (3) is shaped for arranging said stator device (4); - the stator arrangement (4) comprises a stator (26) and a stator carrier (27), to which the stator (26) is fixed radially inward and which is arranged radially outward in the at least one outer housing wall part (3), the stator carrier (27) has a chamfer (35) at the end of an axially extending flange, the chamfer (35) being surrounded in the axial and radial directions by the sealing device (6) or a sealing element (8) of the sealing device (6), and an O-ring seal (36) being arranged between the chamfer (35) and the sealing device (6) or the sealing element (8), the seal (36) sealing between the stator carrier (27) and the sealing device (6) or the sealing element (8).

2. - said sealing device (6) is arranged inside said housing (2) and extends from said at least one outer housing wall part (3) to said rotor device (5); An electric machine according to claim 1, wherein the sealing device (6) is in sealing contact with the at least one outer housing wall part (3) and with a hub unit (19) of the rotor device (5).

3. - the sealing device (6) comprises a radial shaft seal (7) and a molded sealing element (8), the sealing element (8) being formed to extend in the shape of a funnel; and / or 3. An electric machine according to claim 1 or 2, wherein the sealing element (8) forms a mount (11) for a radial shaft seal (7) of the sealing device (6) at its radially inner end, the radial shaft seal (7) being configured in such a way that the radial shaft seal (7) is tensioned against a sealing surface (20) of a hub unit (19) of the rotor device (5) by pretensioning.

4. 2. The electric machine according to claim 1, wherein the rotor arrangement (5) has a hub unit (19) to which a rotor carrier (13) of the rotor arrangement (5) is fixed so as not to rotate relative to the hub unit (19), the rotor carrier (13) being configured for arranging a rotor (12) of the rotor arrangement (5) so as not to rotate relative to the hub unit (19), and / or a connecting part (16) of the rotor arrangement (5) is fixed to the hub unit (19) so as not to rotate relative to the hub unit, the connecting part (16) being configured for connection to a crankshaft (101).

5. the hub unit (19) has a sealing surface (20) for the radial shaft seal (7) of the sealing device (6), the sealing surface (20) being arranged between the rotor carrier (13) of the rotor device (5) and the connecting part (16) of the rotor device (5); and / or 5. An electric machine according to claim 4, wherein the hub unit (19) has a shoulder (21) on one side of which the rotor carrier (13) contacts and on the other side of which the connecting piece (16) contacts, so that a crankshaft (101) of an internal combustion engine (100) can be connected to the rotor carrier (13) via the connecting piece (16) and via the hub unit (19).

6. the hub unit (19) has teeth (23) in which the rotor carrier (13) engages with corresponding counter teeth (23), the teeth (23) and the counter teeth (23) being formed without play; and / or An electric machine according to claim 4 or 5, wherein the hub unit (19) together with the rotor carrier (13) has a shaft-hub connection by means of which a non-rotatable connection between the hub unit (19) and the rotor carrier (13) is ensured.

7. A hybrid drive unit for a vehicle, - an electric machine (1) according to claim 1; - an internal combustion engine (100) with a crankshaft (101) and a flexible disc part (102), - A hybrid drive unit for a vehicle, in which the flexible disk part (102) is arranged non-rotatably relative to the crankshaft (101) and non-rotatably relative to the connecting part (16) of the rotor device (5) of the electric machine (1), so that the rotational energy of the internal combustion engine (100) can be transmitted via the crankshaft (101), the flexible disk part (102) and the connecting part (16) to the hub unit (19), and via the rotor carrier (13) to the rotor (12), converting mechanical energy into electrical energy.

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