DE102021129779A1 - Housing for a transmission gear with an electric drive machine - Google Patents

Abstract

The invention relates to a housing (1) for a transmission (2) with an electric drive machine (3), having at least the following components: - a one-piece first receptacle (4) for an electric drive machine (3), the electric drive machine (3) a stator (5) and a rotor shaft (6) with a rotor winding (7); and - a one-piece second receptacle (8) for a transmission (2), wherein the transmission (2) comprises a first gear stage (9) with a first gear pinion (10) on a transmission input shaft (11), the second receptacle (8) having a first bearing seat (12) for a first gear bearing (13) and a second bearing seat (14) for a second gear bearing (15), wherein a rotor shaft (6) held in the first seat (4) is connected to the rotor shaft (6) held in the second seat (8 ) recorded first gear pinion (10) are aligned with each other on a common axis of rotation (16) by means of the gear bearing (13,15) in the bearing mounts (12,14). The housing (1) is primarily characterized in that the first mount (4) includes a third bearing mount (17) for a rotor bearing (18) for supporting the rotor shaft (6). The housing, which is held in one piece, ensures precise alignment of the rotor shaft and the transmission input shaft, thus reducing hum.

Description

The invention relates to a housing for a transmission with an electric drive machine, a drive unit with such a housing, a motor vehicle with such a drive unit, and an assembly method for such a drive unit.

Motor vehicles that can be driven purely electrically have an electric drive machine that is set up to propel the motor vehicle and is therefore also referred to as a traction machine. The electric drive machine includes a rotor shaft which is connected to a transmission input shaft. Due to manufacturing errors and the resulting misalignments of the rotor shaft and transmission input shaft, humming can occur, especially in the low frequency range of the electric drive machine. This results in undesirable noise emissions when driving comfort. The non-compliance with tolerances, which is the main cause of the hum, results from the large number of separate (housing) components over which the bearing mounts for the bearings of the rotor shaft and the transmission input shaft are distributed. Here the assembly tolerances are added to the manufacturing tolerances.

Proceeding from this, the object of the present invention is to at least partially overcome the disadvantages known from the prior art. The features according to the invention result from the independent claims, for which advantageous configurations are shown in the dependent claims. The features of the claims can be combined in any technically meaningful way, whereby the explanations from the following description and features from the figures can also be used for this purpose, which include additional configurations of the invention.

• - eine einstückige erste Aufnahme für eine elektrische Antriebsmaschine, wobei die elektrische Antriebsmaschine einen Stator und eine Rotorwelle mit einer Rotorwicklung umfasst; und
• - eine einstückige zweite Aufnahme für ein Übersetzungsgetriebe, wobei das Übersetzungsgetriebe eine erste Getriebestufe mit einem ersten Getrieberitzel auf einer Getriebeeingangswelle umfasst,

wobei die zweite Aufnahme eine erste Lageraufnahme für ein erstes Getriebelager und eine zweite Lageraufnahme für ein zweites Getriebelager umfasst,
wobei eine in der ersten Aufnahme aufgenommene Rotorwelle mit dem in der zweiten Aufnahme aufgenommenen ersten Getrieberitzel mittels der Getriebelager in den Lageraufnahmen auf einer gemeinsamen Rotationsachse zueinander gefluchtet sind.The invention relates to a housing for a transmission with an electric drive machine, having at least the following components:

• - A one-piece first receptacle for an electric drive machine, wherein the electric drive machine comprises a stator and a rotor shaft with a rotor winding; and
• - a one-piece second mount for a transmission, the transmission comprising a first gear stage with a first gear pinion on a transmission input shaft,

wherein the second mount comprises a first bearing mount for a first gear bearing and a second bearing mount for a second gear bearing,
wherein a rotor shaft accommodated in the first receptacle is aligned with the first gear pinion accommodated in the second receptacle by means of the transmission bearings in the bearing receptacles on a common axis of rotation.

The housing is primarily characterized in that the first receptacle includes a third bearing receptacle for a rotor bearing for supporting the rotor shaft.

In the following, reference is made to the named (first) axis of rotation if the axial direction, radial direction or the direction of rotation and corresponding terms are used without any explicit indication to the contrary. Unless explicitly stated otherwise, ordinal numbers used in the description above and below only serve to clearly distinguish them and do not reflect any order or ranking of the components referred to. An ordinal number greater than one does not mean that another such component must necessarily be present.

As explained above, the housing proposed here is set up to accommodate an electric drive machine and a transmission gear. In this case, the housing comprises at least two receptacles, each of which is formed in one piece. Housing parts are formed by the receptacles, which together or individually form a closed space for a lubricant, coolant and/or for protection against dirt and water. At least one of the housing parts is produced by casting, preferably by means of gray cast iron or die-cast aluminum. Other suitable lightweight materials are, for example, magnesium or lithium, preferably as alloys.

The first receptacle is set up in such a way that an electric drive machine can be accommodated therein, the electric drive machine comprising a rotor shaft with a rotor winding and a stator. It should be noted that the term rotor winding includes any type of magnetic or magnetizable structure and not just a (copper) wire winding in the narrowest sense. Rather, axially stacked disc-like plates with inserts comprising rare earth metals are often a cost effective implementation of a rotor winding for a traction machine. In one embodiment, the first receptacle is cup-shaped, with the stator and the rotor shaft entering axially into the first receptacle are submerged. Alternatively, the first receptacle is formed like a cover, with at least one connection (for example a flange) for connecting the first receptacle to the second receptacle and the third bearing receptacle then being integrally enclosed by this first receptacle. The second recording can also be referred to as a partially open transmission housing.

The second receptacle includes a U-shaped (in a sectional view) recess. The recess is therefore designed with a wall (lower in this perspective) parallel to the common (first) axis of rotation and two (lateral) walls perpendicular to the first axis of rotation. Two further walls parallel to the (first) axis of rotation are preferably formed, so that the second receptacle forms a receptacle that is open on only one side. It should be noted that in one embodiment the walls merge smoothly into one another or have a transitional rounding, and in one embodiment independently of this they comprise webs, protrusions and other elements, so that the walls may have a complex shape.

In each of the lateral walls (perpendicular to the axis of rotation) there is a bearing mount, in which a friction-reducing bearing can be accommodated, preferably a roller bearing. For this purpose, the walls are spaced apart from one another axially and in a defined manner, for example by means of at least one web, which is formed, for example, parallel to the axis of rotation. In a further embodiment, the two lateral walls (perpendicular to the axis of rotation) are held at an axial distance from one another by means of at least two webs, with the webs being aligned parallel to the axis of rotation in one embodiment. In a preferred embodiment, the webs are arranged, for example, inclined to the axis of rotation, for example like a bell. In a particularly preferred embodiment, a structure is formed that tapers away from the drive machine in the direction of the first axis of rotation, so that a gear cover can be placed over it, so that the housing is (exclusively) closed when the gear cover is placed on top. A connection plane is preferably formed perpendicular to the first axis of rotation in the second bearing mount. In a preferred embodiment, the (e.g. first) bearing receptacle facing away from the electric drive machine is set up for a first transmission bearing (on the transmission side) designed as a fixed bearing, and the other (then second) bearing receptacle is set up for a second transmission bearing designed as a floating bearing. The first bearing retainer and the second bearing retainer are axially opposed and aligned with each other for the corresponding bearings along a common (first) axis of rotation. The third bearing seat for a rotor bearing is formed in the first seat in axial alignment with the two bearing seats of the second seat. This rotor bearing is preferably designed as a fixed bearing (on the motor side) and can be accommodated in the third bearing mount in a correspondingly fixed manner. The coaxiality of the stator to the rotor shaft (or rotor winding) is ensured by means of the bearing mounts.

As soon as the first socket and the second socket are aligned with one another, the three bearings in the bearing sockets are also aligned with one another. The avoidance of an offset is thus dependent solely on the manufacturing accuracy of the recordings and the bearing recordings and the assembly of the two recordings with one another. The first receptacle and the second receptacle are flanged to one another, for example, and can be aligned with one another by means of a screw connection or the corresponding through-holes.

The second receptacle is designed with a radial extent such that the transmission input shaft can accommodate a first transmission stage, with a transmission pinion positioned on the transmission input shaft, of a transmission. In one embodiment, the first gear pinion emerges from the second receptacle and/or another gear pinion emerges into the second receptacle. The transmission gear comprises at least one further gear shaft (i.e. at least the gear output shaft), wherein in one embodiment at least one intermediate shaft between the gear input shaft and the gear output shaft (and at least part of their pinion) is also accommodated in the second receptacle.

It should be pointed out that the third bearing mount is not formed by a separate further element, for example a separate engine cover. This means that only two (separate) housing parts, namely the first receptacle and the second receptacle, have to be aligned with one another. This results in the advantages mentioned with regard to the precise axial alignment of the rotor shaft with the transmission input shaft. With the reduction in the hum, the load on the bearings is also reduced and a smaller, more cost-effective and/or longer-lasting bearing can therefore be used. The bearing mounts of the second mount can preferably be precisely aligned with one another in a single manufacturing step (for example post-processing by machining, for example a cast part). In addition, it is preferably not necessary to use the second Re-clamp the recording for the processing of the bearing recordings.

It is also proposed in an advantageous embodiment of the housing that the second receptacle forms a housing for the first receptacle.

In this embodiment, the first receptacle is accommodated in the second receptacle, preferably pushed axially into the second receptacle. The stator is preferably already preassembled in the first receptacle before the first receptacle and the second receptacle are assembled together. the rotor shaft, on the other hand, is preferably already mounted in the second receptacle before the first receptacle is received by the second receptacle. However, the rotor bearing is particularly preferably preassembled in the first receptacle, so that the rotor bearing is only placed on the rotor shaft when the first receptacle is mounted in the second receptacle. To ensure that the loads during assembly do not cause an excessive tilting moment on the bearings in the first bearing mount and the second bearing mount due to the not inconsiderable mass of the rotor shaft (including the rotor winding), the transmission input shaft and later the rotor shaft or just the rotor shaft are preferably positioned using a retaining mandrel held. The holding mandrel then absorbs at least a sufficiently large part of the loads.

In one embodiment, at least one housing for the first receptacle is formed by the second receptacle such that two contact points or contact lines that are spaced apart (as far as possible) are formed. In one embodiment, a cylindrical wall (as a casing section or circumferentially) is formed over part of the axial, preferably over the entire axial, extent of the rotor shaft, so that the first receptacle and thus the stator is guided and held evenly over this extent. In one embodiment, independently of this, the first receptacle is radially completely surrounded by the second receptacle. It should be pointed out that in this embodiment the first receptacle is not necessarily designed as a housing part that separates a space with its walls from an environment before assembly with the second receptacle.

It is also proposed in an advantageous embodiment of the housing that the first receptacle includes a stator receptacle for the stator of the electrical drive machine that can be accommodated.

In this embodiment, the stator mount is not another separate component that first has to be joined to the first mount. On the contrary, the stator seat is a part or a section of the first seat which is formed in one piece with the first seat. In a preferred embodiment, a large part of the wall with an axial extent (shell section of the first receptacle) is formed as a stator receptacle. For example, T-shaped or double-T-shaped radial webs are included, around which the stator is formed by means of a wound or plugged wire winding.

It is also proposed in an advantageous embodiment of the housing that the housing also includes a first one-piece gear cover, the second receptacle being closable on the gear side by means of the first gear cover.

The (first) gear cover closes the transmission gear or the opening of the second receptacle towards the at least one other gear shaft. The entire transmission gear is preferably surrounded by the second receptacle and the (first) gear cover. In one embodiment, the first gear cover is designed with a flange portion perpendicular to and a flange portion parallel to the axes of rotation, with a wall connecting the flange portions. For example, the wall is the same as or similar to a spherical surface segment.

Furthermore, it is proposed here that the (first) gear cover is also produced using a suitable casting process and is formed from the same or similarly suitable metal alloy. It should be noted that in an embodiment with the first gear cover, preferably no further gear cover is provided, the housing is preferably formed exclusively by the first receptacle, the second receptacle and the first gear cover, and is particularly preferably completely closed. It should be pointed out that in the case of bearings and in the case of shaft passages, through-openings are formed, these being sealed by means of a (possibly dynamic) seal. In the case of bearings, caps are preferably attached, which are attached in a sealing manner but are particularly preferably easy to remove as inspection caps.

• - die dritte Aufnahme mit der zweiten Aufnahme einstückig gebildet ist, wobei bevorzugt die dritte Aufnahme mittels des ersten Getriebedeckels nach einer Ausführungsform gemäß der obigen Beschreibung getriebeseitig verschließbar ist, oder
• - die dritte Aufnahme von einem zweiten Getriebedeckel umfasst ist, wobei bevorzugt die zweite Aufnahme im Bereich der ersten Aufnahme hin zu dem zweiten Getriebedeckel offen ist, und/oder wobei bevorzugt der zweite Getriebedeckel einstückig gebildet ist.

It is also proposed in an advantageous embodiment of the housing that a third receptacle is also provided, which is designed to accommodate a differential, wherein:

• - The third seat is formed in one piece with the second seat, preferably the third seat by means of the first gear cover according to an embodiment according to the above Description is lockable on the transmission side, or
• - The third receptacle is comprised of a second gear cover, the second receptacle preferably being open in the region of the first receptacle towards the second gear cover, and/or the second gear cover preferably being formed in one piece.

As described above, this third receptacle is preferably designed as a housing part, ie for enclosing a space. The differential is positioned and secured in the third mount and torque supported. For example, the third mount is aligned with the second axis of rotation of the differential parallel to the first axis of rotation and/or arranged in axial overlap with the first mount and/or with the rotor shaft. In one embodiment, for example, the transmission gear is arranged on one side (for example on the right) of the electric drive machine and the differential in an external view. In many applications, a differential is arranged as centrally as possible between the left and right output shafts (in a motor vehicle, for example, the drive shafts of the drive axle). The electric drive machine is then also arranged approximately centrally thereto, but offset with its (first) axis of rotation parallel to the (second) axis of rotation.

In one embodiment, the third receptacle is integrally formed with the second receptacle. In this case, the third receptacle can preferably be closed on the transmission side by means of the first transmission cover according to an embodiment according to the above description. In a preferred embodiment, the second receptacle and the third receptacle form a common plane as a connection surface, for example perpendicular to the at least one axis of rotation, for the first gear cover. In one embodiment, the above-described bell-like webs protrude axially beyond this connection surface, so that the first gear cover is slipped over this bell-like structure and placed on the connection surface, and the housing is thus closed.

In another embodiment, the third receptacle is formed separately from the second receptacle. In one embodiment, the third receptacle can be closed on the transmission side by means of said first transmission cover. Alternatively, the third receptacle is encompassed by a second gear cover and preferably no such first gear cover is provided. In a preferred embodiment, the housing is formed and enclosed solely by the first receptacle, the second receptacle and the second gear cover. Regarding passage openings for bearings and/or shaft passages, reference is accordingly made to the above description of the embodiment with the first gear cover.

In one embodiment, the second receptacle is designed to be open in the area of the first receptacle towards the third receptacle. In one embodiment, this area is closed by the wall of the first receptacle. In one embodiment, this area is closed by a separate intermediate cover or not.

In one embodiment, the second gear cover is formed in one piece. The number of parts is therefore low. A plurality of bearing mounts for the second axis of rotation, and optionally for at least one axis of rotation of an intermediate shaft, is also preferably formed in the second gear cover and the coaxial alignment is machined (for example by machining) in one manufacturing step. Compare this to the previous description of the first bearing mount and the second bearing mount in the second mount.

In one embodiment, a combination of the first gear cover and the second gear cover is formed, with the housing part (preferably formed in one piece from the second receptacle) for receiving the differential at the level of the second axis of rotation forming a connecting plane and the first gear cover as previously described is trained. The first gear cover and the second gear cover are preferably formed in one piece. This results in an approximately L-shaped gear cover.

• - ein Gehäuse nach einer Ausführungsform gemäß der obigen Beschreibung;
• - eine elektrische Antriebsmaschine mit einem Stator und einer Rotorwelle mit einer Rotorwicklung ;
• - ein Übersetzungsgetriebe mit einer ersten Getriebestufe und einer zweiten Getriebestufe; und

wobei die Antriebsmaschine in der ersten Aufnahme und ein erstes Getrieberitzel der ersten Getriebestufe in der zweiten Aufnahme aufgenommen sind,
wobei bevorzugt weiterhin ein Differential umfasst ist.According to a further aspect, a drive unit is proposed, having at least the following components:

• - a housing according to an embodiment as described above;
• - An electric drive machine with a stator and a rotor shaft with a rotor winding;
• - A transmission gear with a first gear stage and a second gear stage; and

wherein the drive machine is accommodated in the first receptacle and a first gear pinion of the first gear stage is accommodated in the second receptacle,
preferably further including a differential.

The drive unit proposed here is set up, for example, as a traction machine for propelling a motor vehicle. A differential is then preferably included in the housing. Inside the housing is by means of the electrical The drive machine transmits a drive torque to the transmission input shaft via the rotor shaft. The rotor shaft and the transmission input shaft are very precisely axially aligned with one another on the first axis of rotation by means of the three bearings in the three bearing mounts described above. Starting from the (optional) differential, the torque is transmitted to two consumers, in a motor vehicle a left-hand drive wheel and a right-hand drive wheel.

With the drive unit proposed here, humming, ie noise emission with a low frequency, as a result of misalignment can be avoided easily and thus inexpensively during assembly. At the same time, assembly can be carried out easily using known means and known bearing components and can be integrated into a production line.

According to a further aspect, a motor vehicle is proposed having at least one drive wheel, a drive unit according to an embodiment according to the above description for propelling the motor vehicle via the at least one drive wheel and a traction battery for supplying the electric drive machine with an electric power voltage.

It is now proposed here that a motor vehicle includes such a drive unit, with the electrical power voltage required for propelling the motor vehicle being made available by means of a traction battery. The traction battery is electrically connected to the drive unit and supplies the drive unit, depending on the propulsion requirement, for example depending on the position of the so-called gas pedal, the electric drive machine of the drive unit, with a correspondingly required electrical power voltage. The torque (generated in the electric drive machine) can be transmitted to the transmission gear via the rotor shaft and the transmission input shaft. Starting from the transmission gear, the torque (preferably via the differential) can be transmitted to the at least one drive wheel. The drive wheels transmit the torque to the ground and thus propel the vehicle forward.

The drive unit is protected from the outside by the housing described herein in such a way that no or only very small amounts of dirt and splashing water can penetrate into the drive unit and the transmission gear (and purely optionally the differential). It is also ensured that no or only small amounts of lubricant leave the housing. The rotor shaft and the transmission input shaft are very precisely aligned coaxially with one another by means of the housing proposed here. This efficiently suppresses disturbing noise emissions that are perceived as humming.

1. a. Bereitstellen des Gehäuses;
2. b. Einsetzen der Getriebeeingangswelle in der zweiten Aufnahme und eines getriebeseitigen Festlagers in der ersten Lageraufnahme der zweiten Aufnahme;
3. c. Aufschieben eines Loslagers auf die Getriebeeingangswelle und Einsetzen des Loslagers in der zweiten Lageraufnahme der zweiten Aufnahme;
4. d. Einbringen der Rotorwelle in die erste Aufnahme und Verbinden der Rotorwelle mit der Getriebeeingangswelle; und
5. e. Aufschieben eines motorseitigen Festlagers auf die Rotorwelle und Verbinden der ersten Aufnahme mit der zweiten Aufnahme.

According to a further aspect, an assembly method for a drive unit according to an embodiment as described above is proposed, the assembly method comprising at least the following steps:

1. a. providing the housing;
2. b. Insertion of the transmission input shaft in the second receptacle and a fixed bearing on the transmission side in the first bearing receptacle of the second receptacle;
3. c. Sliding a floating bearing onto the transmission input shaft and inserting the floating bearing in the second bearing mount of the second mount;
4. i.e. Inserting the rotor shaft into the first receptacle and connecting the rotor shaft to the transmission input shaft; and
5. e. Sliding a motor-side fixed bearing onto the rotor shaft and connecting the first mount to the second mount.

An assembly method for the drive unit described above is proposed here. In a step a. first a housing is provided, which is produced, for example, by means of casting. In one embodiment, this step includes a. a precision post-processing of the bearing mounts. Any chip-removing processes and quality control are preferably already completed in advance. In a subsequent step b. then the transmission input shaft, optionally with the already pre-assembled transmission pinion, is inserted into the first transmission bearing in the first bearing mount of the second mount. The first transmission bearing is already in front of, used at the same time or afterwards in the second bearing mount. For example, the transmission input shaft and the first transmission bearing are already preassembled with one another. The first transmission bearing is preferably facing away from the engine side and/or designed as a fixed bearing (on the transmission side) and is thus axially fixed both on the transmission input shaft and in the first bearing mount, for example pressed on or pressed in.

In a step c. becomes before, after or at the same time as step b. a floating bearing is pushed onto the transmission input shaft and this floating bearing is inserted into the second bearing mount. In one embodiment, the floating bearing is fixed axially on the transmission input shaft or secured in the second bearing mount or solely with a relatively large axial play on the transmission input shaft and/or in the second bearing mount.

In one embodiment, the floating bearing in step c. applied to the rotor shaft, with the rotor shaft then forming a one-piece part of the transmission input shaft, i.e. the connection point (or the part of the connection point that is visible at least radially on the outside) is arranged between the two transmission bearings.

In a step d. will follow step c. introduced a rotor shaft with a rotor winding in the first recording and torque-transmitting connected to the transmission input shaft, for example by means of a spline. In this case, a holding mandrel is preferably used as an aid, by means of which (as already indicated above) the loads against tilting in the transmission bearings in the two bearing mounts of the second mount are reduced or completely absorbed.

In a step e. Finally, the stator of the electric drive machine, together with the first receptacle, is aligned coaxially with the second receptacle and connected. The stator and/or the rotor bearing are already mounted in the first mount in advance. In one embodiment, the rotor bearing is only inserted into the third bearing seat of the first seat after the assembly of the first seat with the second seat. In one embodiment, the rotor bearing is already placed on the rotor shaft and is inserted into the third bearing seat during or after the two seats are connected to one another. The rotor bearing is preferably designed as a (motor-side) fixed bearing.

It is further proposed in an advantageous embodiment of the assembly method that after completion of step c., preferably after completion of step e., in a step f . a second gear stage is introduced into the housing, at the end of step g. a gear cover, preferably according to an embodiment according to the above description, applied and thus the second receptacle and the third receptacle are closed.

It is now proposed here that in a step f. after completion of step c. (Sliding a floating bearing onto the transmission input shaft and inserting the floating bearing in the second bearing mount of the second mount), preferably after completing step e. (Sliding a motor-side fixed bearing onto the rotor shaft and connecting the first mount to the second mount), a differential into a third recording, as described above, is introduced. Thereafter, in a final step g. introduced or completed a second gear stage in the gear-side opening of the second recording and the third recording and at the end of step g. the remaining opening of the second receptacle (and optionally the third receptacle) is closed by means of a gear cover (for example as described above). In one embodiment, caps and/or seals are then applied to through-openings. Alternatively, these can only be installed on site. Alternatively, part or all of the assembly method is carried out on site, for example at a corresponding assembly position in a drive train of a motor vehicle.

• 1 ein Gehäuse in einer ersten Ausführungsform in einer schematischen Schnittansicht;
• 2 eine zweite Aufnahme des Gehäuses während Schritt b. in einer schematischen Schnittansicht;
• 3 die zweite Aufnahme gemäß 2 während Schritt c. in einer schematischen Schnittansicht;
• 4 die zweite Aufnahme gemäß 2 und 3 während Schritt d. in einer schematischen Schnittansicht;
• 5 ein Gehäuse mit der zweiten Aufnahme gemäß 2 bis 4 während Schritt e. in einer schematischen Schnittansicht;
• 6 ein Gehäuse in einer zweiten Ausführungsform in einer schematischen Schnittansicht;
• 7 ein Gehäuse in einer dritten Ausführungsform in einer schematischen Schnittansicht; und
• 8 ein Kraftfahrzeug mit einer Antriebseinheit in einer schematischen Draufsicht.

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 restricted by the purely schematic drawings, it being noted that the drawings are not true to scale and are not suitable for defining size relationships. It is presented in

• 1 a housing in a first embodiment in a schematic sectional view;
• 2 a second shot of the housing during step b. in a schematic sectional view;
• 3 the second recording according to 2 during step c. in a schematic sectional view;
• 4 the second recording according to 2 and 3 during step d. in a schematic sectional view;
• 5 a housing according to the second recording 2 until 4 during step e. in a schematic sectional view;
• 6 a housing in a second embodiment in a schematic sectional view;
• 7 a housing in a third embodiment in a schematic sectional view; and
• 8th a motor vehicle with a drive unit in a schematic top view.

In 1 a housing 1 in a first embodiment is shown in a schematic sectional view with a transmission gear 2 , an electric drive motor 3 and a differential 23 . The housing 1 comprises three receptacles 4 , 8 , 22 , the first axis of rotation 16 (motor axis and transmission input axis) being horizontally aligned in the lower area of the housing 1 , as illustrated. The second rotation Axis 34 (transmission output axis) is arranged parallel to the first axis of rotation 16 in the upper area of the housing 1 . The first receptacle 4 is arranged on the left along the first axis of rotation 16 and the second receptacle 8 is arranged on the right. The third receptacle 22 is arranged according to the second axis of rotation 34 above the first receptacle 4 and the second receptacle 8 in axial overlap with the first receptacle 4, so that the transmission gear 2 is located radially between the two axes of rotation 16,34 in the illustration to the right of the first receptacle 4 and the third receptacle 22 extends. In this exemplary embodiment, the transmission gear 2 comprises a first gear stage 9 and a second gear stage 26 , the first gear pinion 10 on the gear input shaft 11 being part of the first gear stage 9 .

The third receptacle 22 is formed in one piece with the second receptacle 8 here, purely as an option. The third receptacle 22 has an opening to the right, as shown, towards the transmission gear 2 and is set up to accommodate a differential 23 .

A first gear cover 21 is now arranged here in such a way that it closes the angled opening of the second receptacle 8 and the third receptacle 22 and thus the transmission gear 2 .

A first bearing seat 12 is provided in the right side wall of the second seat 8 as shown. The first bearing mount 12 is here (purely optional) for accommodating a transmission-side fixed bearing 31 and the second bearing mount 14 is correspondingly set up for accommodating a floating bearing 32 . In this embodiment, the second receptacle 8 also includes the third receptacle 22 and (independently of this) a housing 19 is formed for the first receptacle 4, with a cylindrical guide here (purely optional) extending over the entire axial extent of the rotor shaft 6 and the Stator 5 for the first recording 4 is formed.

The first receptacle 4 is designed in such a way that it forms a motor housing, with the stator 5 preferably being received by the stator receptacle 20 formed in one piece. The (purely optional) housing 19 of the second receptacle 8 is closed by the first receptacle 4 in the axial position of the third bearing receptacle 17 in this exemplary embodiment. It should be pointed out here that all three bearing mounts 12 , 14 , 17 are arranged coaxially with respect to the first axis of rotation 16 . If the assembly method is carried out appropriately, the radial position and the relative tilting of the first receptacle 4 can be adjusted using the pre-positioned rotor shaft 6 (cf 4 ).

In 2 is a second seat 8 of the housing 1 during step b. an embodiment of the assembly method shown in a schematic sectional view. The second recording 8 is here without excluding the general public purely for the sake of clarity as far as possible with the in 1 embodiment shown is identical, so that reference is made to the description there. A third receptacle 22 for a differential 23 is not included here (purely optional), at least not in one piece.

In step b shown. a transmission input shaft 11 is placed in a second receptacle 8 and a first transmission bearing 13, embodied here for example as a (transmission-side) fixed bearing 31, is inserted beforehand, at the same time or subsequently, and the transmission input shaft 11 is thus supported in the first bearing receptacle 12. A first gear pinion 10 of a transmission gear 2 (cf 1 ) already applied in advance, for example formed in one piece, or is then postponed. The fixed bearing 31 on the transmission side is preferably both pressed onto the transmission input shaft 11 and also pressed into the first bearing mount 12 .

In 3 is the second recording 8 according to 2 during step c. an embodiment of the assembly method shown in a schematic sectional view. Here, in the second bearing seat 14, a second transmission bearing 15, designed here for example as a movable bearing 32, is pushed onto the transmission input shaft 11 and introduced in such a way that the transmission input shaft 11 is supported there.

In 4 is the second recording 8 according to 2 and 3 during step d. an embodiment of the assembly method shown in a schematic sectional view. Here, a rotor shaft 6, comprising a rotor winding 7, is introduced into the housing 19 of the second receptacle 4 and is connected to the transmission input shaft 11 in a torque-transmitting manner, for example by means of splines. A retaining mandrel 35 is preferably inserted into the transmission input shaft 11, and particularly preferably also into the rotor shaft 6, so that on the one hand precise alignment, coaxial to the first axis of rotation 16, is ensured and on the other hand the tipping loads resulting from the not inconsiderable mass of the rotor shaft 6 together with the rotor winding 7 is reduced to the gear bearing 13,15.

In 5 is a housing 1 with the second receptacle 8 according to 2 until 4 during step e. an embodiment of the assembly method shown in a schematic sectional view. Here a stator mount 20 comprising a stator 5 is introduced into the second mount 8 with the first mount 4 , the stator mount 20 including a third bearing mount 17 with a rotor bearing 18 . The rotor bearing 18 is designed here (purely optional) as a fixed bearing 33 on the motor side. The rotor shaft 6 is supported coaxially to the first axis of rotation 16 when the stator receptacle 20 is introduced within the fixed bearing 33 on the motor side. It should be pointed out here that the long contact path in this advantageous embodiment of the stator receptacle 20 in the housing 19 enables simple pre-assembly while reliably avoiding a collision with the rotor winding 7, for example without additional guide aids. In one embodiment, a radial play is provided, which allows a correction of the relative radial position and/or the tilting, which can be adjusted, for example, via a flange with a screw connection. Alternatively, no adjustment is necessary because the housing 19 is precisely aligned with the bearing mounts 12 , 14 of the second mount 8 and the stator mount 20 is precisely aligned with the third bearing mount 17 of the first mount 4 .

Steps relating to the differential 23 and/or the transmission gear 2 can be carried out subsequently, in parallel or in some cases in advance.

In 6 a housing 1 is shown in a second embodiment in a schematic sectional view. The housing 1 is largely like the embodiment in FIG 1 shown, whereby reference is made to the description there without excluding the general public. In this embodiment too, the housing 1 comprises a first receptacle 4, a second receptacle 8 and a third receptacle 22. The components that can be accommodated are not shown here for the sake of clarity. The third receptacle 22 is also here for receiving a differential 23 (cf 1 ) set up and has a second axis of rotation 34, wherein the second axis of rotation 34 is arranged parallel to a first axis of rotation 16. Only deviating characteristics are dealt with here.

The third receptacle 22 is formed in one piece with a second gear cover 24 which, as shown, is positioned above the first receptacle 4 and the second receptacle 8 and is connected directly to the second receptacle 8 and indirectly to the first receptacle 4 . The second gear cover 24 is set up in such a way that the (purely optional only) opening of the second receptacle 8 is closed by it. The first receptacle 4 forms a housing 19 for a stator receptacle 20, which is set up to receive a stator 5 of an electric drive machine 3 (cf 1 ). The first receptacle 4 also includes a third bearing receptacle 17 which is aligned with a first bearing receptacle 12 and a second bearing receptacle 14 .

In addition, purely optionally, no wall is provided between the third receptacle 22 and the first receptacle 4 . Rather, a separation between the space for the differential 23 and the space for the electric drive machine 3 is formed solely by the stator receptacle 20 .

In 7 a housing 1 is shown in a third embodiment in a schematic sectional view. The housing 1 is largely like the embodiment in FIG 1 and 6 shown, whereby reference is made to the description there without excluding the general public. In this embodiment too, the housing 1 comprises a first receptacle 4, a second receptacle 8 and a third receptacle 22. The components that can be accommodated are not shown here for the sake of clarity. The third receptacle 22 is also here for receiving a differential 23 (cf 1 ) furnished. Only deviating characteristics are dealt with here.

In this embodiment, the second receptacle 8 has a bell-like structure, for example a left-hand web 36 (relative to the first axis of rotation 16) and a right-hand web 37, between its left side wall as shown (with the second bearing mount 14) and the right side wall as shown (With the first bearing mount 12). The radial distance between the webs 36,37 is greater in the illustrated left side wall than in the illustrated right side wall, so that the second receptacle 8 tapers toward the first gear cover 21 of the housing 1 like a bell. The first bearing mount 12 for the first transmission mount 13 is formed in the right side wall as shown in the illustration and is therefore also arranged here in the same component (second mount 8) as the second bearing mount 14 .

In this embodiment, the first gear cover 21 has the shape of a pot and, as shown, is fitted from the right with the second receptacle 8 and third receptacle 22 and the housing 1 is thus closed. The first gear cover 21 is slipped completely over the bell-like structure of the second receptacle 8, with the rotor shaft 6 passing through a (preferably sealed) through-opening 38 (or alternatively arranged protruding into a recess instead of the through-opening 38).

In 8th a motor vehicle 27 with a drive unit 25 is shown in a schematic plan view. The drive unit 25 comprises a housing 1 in which an electric drive machine 3, a transmission gear 2 and a differential 23 are housed. The electric drive machine 3 is connected in a torque-transmitting manner via the differential 23 to a left-hand drive wheel 28 and a right-hand drive wheel 29 (here purely optionally on the rear axle) in order to propel the motor vehicle 27 . The motor vehicle 27 also includes a traction battery 30 which provides a necessary electric power voltage to the electric drive machine 3 .

The housing, which is held in one piece, ensures precise alignment of the rotor shaft and the transmission input shaft, thus reducing hum.

Reference List

1

Housing

2

transmission gear

3

electric drive machine

4

first shot

5

stator

6

rotor shaft

7

rotor winding

8th

second recording

9

first gear stage

10

first gear pinion

11

transmission input shaft

12

first inventory

13

first gear bearing

14

second storage recording

15

second gearbox bearing

16

first axis of rotation

17

third camp record

18

rotor bearings

19

enclosure

20

stator mount

21

first gearbox cover

22

third shot

23

differential

24

second gearbox cover

25

drive unit

26

second gear stage

27

motor vehicle

28

left drive wheel

29

right drive wheel

30

traction battery

31

fixed bearing on the transmission side

32

floating bearing

33

motor-side fixed bearing

34

second axis of rotation

35

retaining mandrel

36

left footbridge

37

right footbridge

38

passage opening

Claims (9)

Housing (1) for a transmission (2) with an electric drive machine (3), having at least the following components: - a one-piece first receptacle (4) for an electric drive machine (3), the electric drive machine (3) having a stator (5 ) and a rotor shaft (6) with a rotor winding (7); and - a one-piece second mount (8) for a transmission gear (2), the transmission gear (2) comprising a first gear stage (9) with a first gear pinion (10) on a transmission input shaft (11), the second mount (8) a first bearing seat (12) for a first gear bearing (13) and a second bearing seat (14) for a second gear bearing (15), wherein a rotor shaft (6) held in the first seat (4) has the rotor shaft (6) held in the second seat ( 8) accommodated first gear pinion (10) are aligned with one another by means of the gear bearings (13,15) in the bearing mounts (12,14) on a common axis of rotation (16), characterized in that the first mount (4) has a third bearing mount (17 ) for a rotor bearing (18) for supporting the rotor shaft (6). Housing (1) according to claim 1 , A housing (19) for the first receptacle (4) being formed from the second receptacle (8). Housing (1) according to claim 1 or claim 2 , wherein the first recording (4) comprises a stator recording (20) for the stator (5) of the recordable electric drive machine (3). Housing (1) according to one of the preceding claims, wherein the housing (1) further comprises a first one-piece gear cover (21), the second receptacle (8) being closable on the gear side by means of the first gear cover (21). A housing (1) according to any one of the preceding claims, further comprising a third mount (22) adapted to receive a differential (23), wherein: - the third mount (22) is integrally formed with the second mount (8). is, preferably after the third receptacle (22) by means of the first gear cover (21). claim 4 can be closed on the transmission side, or - the third receptacle (22) is surrounded by a second transmission cover (24), the second receptacle (8) preferably being open in the area of the first receptacle (4) towards the second transmission cover (24), and /or wherein the second gear cover (24) is preferably formed in one piece. Drive unit (25), comprising at least the following components: - a housing (1) according to one of claim 1 until claim 5 ; - An electric drive machine (3) with a stator (5) and a rotor shaft (6) with a rotor winding (7); - A transmission gear (2) with a first gear stage (9) and a second gear stage (26); and wherein the prime mover (3) is accommodated in the first receptacle (4) and a first gear pinion (10) of the first gear stage (9) is accommodated in the second receptacle (8), a differential (23) preferably also being included. Motor vehicle (27) having at least one driving wheel (28, 29), a drive unit (25). claim 6 for propulsion of the motor vehicle (27) via the at least one propulsion wheel (28,29) and a traction battery (30) for supplying the electric drive machine (3) with an electric power voltage. Assembly method for a drive unit (25) according to claim 6 , wherein the assembly method comprises at least the following steps: a. providing the housing (1); b. Insertion of the transmission input shaft (11) in the second receptacle (8) and a fixed bearing (31) on the transmission side in the first bearing receptacle (12) of the second receptacle (8); c. Sliding a floating bearing (32) onto the transmission input shaft (11) and inserting the floating bearing (32) in the second bearing mount (14) of the second mount (8); i.e. Inserting the rotor shaft (6) into the first receptacle (4) and connecting the rotor shaft (6) to the transmission input shaft (11); and e. Sliding a motor-side fixed bearing (33) onto the rotor shaft (6) and connecting the first mount (4) to the second mount (8). assembly procedure claim 8 , wherein after completion of step c., preferably after completion of step e., in a step f. a differential (23) in a third recording (22). claim 5 and in a step g. a second gear stage (26) is introduced into the housing (1), at the end of step g. a gear cover (21), preferably after claim 4 , Applied and thus the second receptacle (8) and the third receptacle (22) are closed.

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