Drive device for motor vehicle, and mounting device and method for mounting such drive device

Abstract

The invention relates to a drive device (10) for a motor vehicle, comprising: an electric machine (12) comprising a stator (14) and a rotor (16) having a rotor shaft (22); the invention relates to a motor rotor (10) for a motor vehicle, comprising a rotor shaft (22), a gear (24) which is arranged on the rotor shaft (22) and has an internal toothing (26) which meshes with a corresponding external toothing (28) of the rotor shaft (22), so that the gear (24) and the rotor shaft (22) are connected to one another in a rotationally fixed manner, the gear (24) having at least three openings (46) which extend in the axial direction of the rotor shaft (22), during the installation of the gear (24), a corresponding retaining pin (42) can be inserted into the opening, and the retaining pin is used for preventing the rotation of the gear (24). At a free end (E) of the rotor shaft (22), an internal thread (48) arranged concentrically with the rotor shaft (22) is provided in the rotor shaft (22).

Description

Technical Field

[0001] The invention relates to a drive device for a motor vehicle and to a mounting device and a method for mounting such a drive device. Background Art

[0002] A fixing arrangement for an output pinion for transmitting the drive of an output power shaft of an internal combustion engine to a chain is known from DE 10 2012 200 185 A1. In addition, DE 112005 000 616 T5 discloses a method for manufacturing a drive pinion of a motor vehicle differential. Summary of the invention

[0003] The object of the present invention is to provide a drive device for a motor vehicle, as well as a mounting device and a method for mounting such a drive device, which allows a particularly simple mounting of the drive device.

[0004] This object is achieved by a drive device having the features of claim 1, a mounting device having the features of claim 4 and a method having the features of claim 5. Advantageous embodiments with suitable developments of the invention are specified in the remaining claims.

[0005] A first aspect of the invention relates to a drive device, in particular an electric drive device, for a motor vehicle (also referred to as a vehicle for short). This means that a motor vehicle, preferably configured as a car, in particular a passenger car, has the drive device in its fully manufactured state and can be driven by means of the drive device. The drive device comprises an electric motor having a stator and a rotor. The rotor can be driven by means of the stator and can therefore rotate relative to the stator around the machine rotation axis. In particular, the electric motor can provide a driving torque via its rotor, by means of which the motor vehicle can be driven, in particular in a purely electric manner. The rotor has a rotor shaft. The drive device also comprises a gear, which is configured separately from the rotor shaft and is arranged on the rotor shaft, i.e. at least on the length region of the rotor shaft. In particular, the gear is a spur gear, in particular a helical spur gear. Therefore, the gear has a toothing, in particular an external toothing, wherein the toothing is preferably configured as a helical toothing. In particular, the length region is an end region of the rotor shaft, which is opposite to the stator in the axial direction of the rotor shaft, i.e. axially. Therefore, the gear is preferably arranged on the end of the rotor shaft axially opposite to the stator. More preferably, the drive device has a spur gear stage, which includes a gear, in particular as a first gear. In addition, for example, the spur gear stage has a second gear, which can be configured as a second spur gear. Preferably, the second spur gear has helical teeth. Preferably, the gears mesh with each other, thus forming a spur gear stage. The spur gear stage is also called a spur gear transmission stage.

[0006] The gear has an internal toothing. The rotor shaft, in particular in the end region and therefore at the end, has an external toothing, also referred to as shaft toothing. Preferably, the internal toothing of the gear and the shaft toothing are spline teeth. The internal toothing of the gear meshes with a corresponding shaft toothing, so that the gear and the rotor shaft are connected to each other in a rotationally fixed manner. In particular, the internal toothing of the gear is connected / slid onto the shaft toothing, in particular in the axial direction of the rotor shaft and therefore along the machine axis of rotation, about which the rotor and therefore the rotor shaft can rotate relative to the stator.

[0007] In order to enable a particularly simple and therefore time-saving and cost-saving installation of the drive device, in particular the gear, on the rotor shaft, it is proposed according to the invention that the gear has at least three openings extending in the axial direction of the rotor shaft, i.e. parallel to the axial direction of the rotor shaft, in particular through openings, which are configured as holes, in particular through holes. During the installation of the gear, corresponding retaining pins can be inserted into these openings, in particular in the axial direction of the rotor shaft, so that the retaining pins can cooperate with the gear in a form-fitting manner. As a result, the gear is fixed or will be fixed without rotation, in particular around the machine rotation axis and relative to the stator. In other words, the rotation of the gear, in particular around the machine rotation axis relative to the stator, has been prevented or will be prevented. At the free end of the rotor shaft, in particular opposite to the stator in the axial direction of the rotor shaft, an internal thread is provided in the rotor shaft, in particular configured as a first thread. For example, the internal thread is arranged or configured to be concentric with the rotor shaft. A corresponding bolt is screwed into the internal thread, in particular so that the bolt has an external thread corresponding to the internal thread as a second thread. The second thread is screwed in as an internal thread, so that the gear is held at the stop of the rotor shaft in the axial direction of the rotor shaft by means of the bolt in at least indirect, in particular direct supporting contact. The stop is, for example, arranged at the outer periphery of the rotor shaft. In particular, since the bolt is screwed into the internal thread of the rotor shaft, the bolt presses the gear against the stop, which is, for example, configured as a flange / shoulder of the rotor shaft or formed by a flange / shoulder of the rotor shaft. As a result, the gear is fixed to the rotor shaft in the axial direction of the rotor shaft, thereby preventing the relative movement between the gear and the rotor shaft from occurring in the axial direction of the rotor shaft. The gear is therefore both connected to the rotor shaft in a rotationally fixed manner and axially fixed to the rotor shaft. These openings, internal threads and bolts make it possible to fix the gear to the rotor shaft in a particularly time-saving and cost-effective manner without causing any undesirable damage to the motor, in particular the bearing portion of the motor. In particular, the present invention makes it possible to connect the gear to the rotor shaft in a rotationally fixed manner and to fix it axially to the rotor shaft without pressing the gear onto the rotor shaft. The invention is based on the finding that it is not possible to press-fit the gear onto the rotor shaft, otherwise the bearings of the electric machine could be damaged. In contrast, the invention makes it possible to connect the gear to the rotor shaft securely, in particular both in a rotationally fixed manner and in the axial direction of the rotor shaft, without having to press-fit the gear onto the rotor shaft. This allows the drive to be mounted in a time-saving, cost-effective and damage-free manner. A thermal connection of the gear to the rotor shaft, which can be carried out, for example, using nitrogen and / or induction heating, is conceivable in principle, but is very costly and therefore unsuitable for mass production. In contrast, the invention makes it possible to connect the gear to the rotor shaft in a time-saving and cost-effective manner and therefore in a manner suitable for mass production, without causing damage to the bearings of the electric machine.

[0008] For example, the openings of the gear are arranged symmetrically with respect to a center point of the gear, which is, for example, located on the machine rotation axis. In particular, it is conceivable that these openings are arranged on an imaginary circle, whose center is located on the machine rotation axis and / or coincides with the center of the gear. More particularly, it is conceivable that these openings are arranged to be evenly distributed in a circumferential direction of the gear and the rotor shaft extending around the machine rotation axis and therefore around the axial direction of the rotor shaft, i.e., spaced equidistantly from each other in pairs. Thus, it can be advantageously ensured during installation that the gear and, via the gear, the rotor shaft does not experience an undesirable torque relative to the stator.

[0009] During installation, the retaining pin is, for example, retained or fixed at a retaining plate, which is, for example, fixed to the housing of the electric machine. For example, the rotor shaft is at least temporarily arranged in the housing. The retaining pin serves on the one hand to fix the rotor shaft and the gear, that is, to prevent the rotor shaft and the gear from an undesired rotation relative to the housing about the machine rotation axis. As a result, the bolt can be screwed in, in particular tightened or screwed in, in a particularly advantageous manner without causing an undesired rotation of the gear and the rotor shaft. On the other hand, the retaining pin serves, for example, to center the gear, in particular relative to the rotor shaft, during installation. For example, the retaining plate is screwed to the housing (also referred to as the motor housing) by means of a plurality of rods, in particular threaded rods, and is thus fastened, in particular fixed to the housing.

[0010] In another embodiment of the present invention, the drive device comprises the above-mentioned housing of the electric motor, and the rotor shaft is at least partially arranged in the housing.

[0011] It has proven to be particularly advantageous here if the housing has at least three recesses by means of which a retaining plate provided for retaining the retaining pins can be fixed to the housing during installation or the retaining plate can be fixed to the housing by means of the recesses. For example, the respective recesses are designed as respective holes. For example, it is conceivable that a respective further internal thread is arranged in the respective recess, into which, for example, a respective rod, in particular designed as a threaded rod, can be screwed in order to thereby fix the respective rod to the housing. This makes it possible to achieve a particularly simple installation that can therefore be carried out in a time-saving and cost-effective manner.

[0012] The second aspect of the present invention relates to a mounting device for mounting, that is, for mounting the drive device according to the first aspect of the present invention. The advantages and advantageous designs of the first aspect of the present invention should be regarded as the advantages and advantageous designs of the second aspect of the present invention, and vice versa.

[0013] The mounting device of the invention has a retaining plate as described above, which has a first through-opening, in particular a central through-opening. The first through-opening is configured, for example, as a hole. In particular, the first through-opening, also referred to as the first opening, is centrally located, in particular relative to the rotor shaft, so that, for example, when the retaining plate is in a state fixed to the housing, the first through-opening of the retaining plate is arranged concentrically with the rotor shaft, and / or the rotor shaft and here in particular the internal thread overlap in the axial direction through the first through-opening. In particular, for example, the retaining plate can be pushed onto the rotor shaft via the first through-opening, that is, onto the longitudinal / length region or the aforementioned free end, in particular so that the length region or the free end of the rotor shaft can be arranged in the first through-opening of the retaining plate. Thus, for example, the retaining plate can be pushed onto the length region of the rotor shaft or the free end of the rotor shaft in the axial direction of the rotor shaft.

[0014] The bolt can be inserted through the through-opening, in particular in the axial direction of the rotor shaft, so that the bolt can then be screwed into the corresponding internal thread of the rotor shaft, in particular via the first through-opening. For example, a screwing tool can penetrate the first through-opening of the retaining plate and screw the bolt into the corresponding internal thread of the rotor shaft, wherein, for example, the screwing tool is connected to the bolt in a torque-transmitting manner, in particular in a rotationally fixed manner.

[0015] The mounting device has at least three or exactly three retaining pins, which should be retained or can be fixed at the retaining plate, in particular, are retained or fixed at the retaining plate, so that the retaining pins can be fixed or fixed at the retaining plate in space. The corresponding retaining pins can be inserted through or inserted into the corresponding openings of the gear, wherein, when the corresponding retaining pins are inserted through or inserted into the corresponding corresponding through openings of the gear and are simultaneously fixed at the retaining plate, the corresponding retaining pins cooperate with the retaining plate and the gear in a form-fitting manner. As a result, the gear and the rotor shaft via the gear cannot rotate relative to the housing, especially around the machine rotation axis. Here, the retaining device has the above-mentioned at least three or exactly three rods, which are also called retaining rods and are configured as threaded rods, for example. These retaining rods can be fixed or fixed at the housing of the motor, wherein the retaining plate is connected / fastened at these retaining rods. Therefore, the retaining plate can be fixed at the housing via the retaining rods, in particular so that the relative movement between the retaining plate and the housing of the motor is prevented. As a result, it can be ensured that the gear and the rotor shaft cannot rotate relative to the housing around the machine rotation axis via the retaining pins, the retaining plate and the retaining rods.

[0016] A third aspect of the invention relates to a method for installing a drive device for a motor vehicle (also referred to as an installation method), in particular a drive device according to the first aspect of the invention. In the method, a drive device is provided, which comprises an electric machine having a stator, a rotor and a housing. In the method, the rotor has a rotor shaft, which is at least partially arranged in the housing. In the method, a gear, preferably configured as a spur gear, is provided, which has an internal toothing. The gear is arranged on the rotor shaft in such a way that the internal toothing meshes with a corresponding external toothing of the rotor shaft, thereby connecting the gear and the rotor shaft to each other in a rotationally fixed manner. For example, the gear is placed on the rotor shaft in the axial direction of the rotor shaft, so that the internal toothing of the gear and the external toothing of the rotor shaft are plugged into each other in the axial direction of the rotor shaft. In the method, a retaining plate of a retaining device is provided, which retaining plate has at least three or exactly three through-openings, wherein the retaining plate is fixed to the housing, so that the relative movement between the retaining plate and the housing is blocked. In the method, the gear has at least three or exactly three openings extending in the axial direction of the rotor shaft. The feature that the openings extend in the axial direction of the rotor shaft may be understood to mean that the respective openings are continuous along respective penetration directions extending parallel to the axial direction of the rotor shaft.

[0017] The corresponding retaining pin is inserted into the corresponding opening, and the retaining pin is also inserted through the corresponding second through-opening of the retaining plate. As a result, the retaining pin simultaneously penetrates the second through-opening and is inserted into or passes through the above-mentioned opening, so that the retaining pin cooperates with the retaining plate and the gear in a form-fitting manner. As a result, the retaining pin ensures that the gear does not rotate relative to the housing in a form-fitting manner, thereby also ensuring that the rotor shaft does not rotate relative to the housing.

[0018] The rotor shaft has an internal thread provided, arranged or constructed in the rotor shaft and arranged concentrically with the rotor shaft at its free end, especially in the axial direction of the rotor shaft, opposite to the stator. A bolt is screwed into the internal thread, by means of which the gear is held at a stop of the rotor shaft in at least indirect supporting contact in the axial direction of the rotor shaft, thereby fixing the gear on the rotor shaft in the axial direction of the rotor shaft. The advantages and advantageous designs of the first and second aspects of the present invention are regarded as the advantages and advantageous designs of the third aspect of the present invention, and vice versa.

[0019] In order to be able to install the drive device in a particularly time-saving and cost-saving manner without causing unwanted damage, it is proposed in one embodiment of the invention that the screw is screwed in the direction of the gear in at least three, in particular temporally consecutive screwing stages and is thus rotated relative to the rotor shaft in a first rotational direction, wherein the three screwing stages differ from one another with regard to the torques applied when screwing and thereby rotating the screw in the first rotational direction of the rotor shaft.

[0020] In order to be able to fix the gear particularly firmly axially on the rotor shaft on the one hand and to avoid damage to the electric motor during installation on the other hand, it is proposed in a further embodiment of the invention that at least one or exactly one loosening phase is provided between at least two or exactly two of the screwing phases, in which the bolt is loosened and thus rotated relative to the rotor shaft in a second rotational direction opposite to the first rotational direction and thus screwed out of the gear at least a certain distance.

[0021] In order to be able to carry out the installation in a time-saving and cost-effective manner, a further embodiment of the invention provides that in the loosening phase the bolt is rotated at least 80 degrees and at most 100 degrees relative to the rotor shaft, in particular in the second direction, in order to loosen the bolt.

[0022] In order to be able to securely fix the gear on the rotor shaft in a time-saving and cost-effective manner and to reliably avoid damage to the motor, it is proposed in a further embodiment of the present invention that in a first screwing phase, the bolt is screwed at least 25 Newton meters, at most 35 Newton meters, i.e., rotated in the first rotational direction. In a second screwing phase that temporally follows the first screwing phase, the bolt is rotated at at least 63 Newton meters, at most 77 Newton meters relative to the rotor shaft, in particular in the first rotational direction. In a third screwing phase that temporally follows the second screwing phase, the bolt is screwed at at least 135 Newton meters, at least 165 Newton meters and is rotated in the first rotational direction relative to the rotor shaft and, for example, tightened, so that the gear can be securely and securely fastened to the rotor shaft without causing damage to the motor.

[0023] Finally, it has proven to be particularly advantageous that in the first screwing phase, the bolt is rotated at a speed of up to 200 revolutions per minute and thus screwed, in particular in the first rotational direction. This allows the installation to be performed in a time-saving and cost-effective manner. It has proven to be further advantageous that in the second screwing phase, the bolt is rotated at a speed of up to 30 revolutions per minute and thus screwed, in particular in the first rotational direction relative to the rotor axis. This allows damage to be reliably avoided. In order to be able to perform the installation in a time-saving and cost-effective manner on the one hand and to be able to perform the installation reliably on the other hand so that damage can be avoided, it is proposed in a further design of the invention that in the third screwing phase, the bolt is rotated at a speed of up to 30 revolutions per minute and thus screwed, in particular in the first rotational direction relative to the rotor axis.

[0024] Finally, it has proven particularly advantageous to rotate the bolt at a speed of at most 30 revolutions per minute during the loosening phase, in particular in the second rotational direction relative to the rotor axis, so that excessive loosening of the bolt can be reliably avoided. This allows installation to be carried out in a time-saving and cost-effective manner.

[0025] The invention enables the gear to be installed without damaging the motor. Furthermore, the installation can be performed in a time-saving and cost-effective manner and with high productivity and low error rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Further advantages, features and details of the invention are given in the following description of preferred embodiments and with reference to the drawings. The above features and combinations of features mentioned in the description, as well as the features and combinations of features mentioned in the description of the drawings and / or shown alone in the drawings, can be used not only in the respective combination but also in other combinations or alone without departing from the scope of the invention.

[0027] In the drawing:

[0028] Figure 1 A schematic cross-sectional view of the transmission device when installed in a drive device for a motor vehicle is partially shown;

[0029] Figure 2 A schematic perspective view of the drive unit when installed is partially shown;

[0030] Figure 3 Another schematic perspective view of the drive device during installation is partially shown.

[0031] In the figures, identical or functionally identical elements are provided with the same reference symbols. DETAILED DESCRIPTION

[0032] Figure 1 A drive device 10, in particular an electric or electrical drive device, for a motor vehicle (also referred to as vehicle for short) is partially shown in a schematic longitudinal section. This means that the motor vehicle has the drive device 10 in its fully manufactured state and can be driven by means of the drive device 10, in particular purely electrically. Figure 1 The drive device 10 is shown when the drive device 10 is installed. The installation, that is, the method for installing the drive device 10, will be described below in conjunction with Figures 1 to 3 Detailed description. Figure 1As can be seen in FIG, the drive device 10 comprises an electric machine 12 having a stator 14 and a rotor 16 as well as a housing 18. The rotor 16 is arranged at least partially in the housing 18. In principle, the rotor 16 can be driven by means of the stator 14 and can therefore rotate relative to the stator 14 and relative to the housing 18 about a machine axis of rotation 20 (also referred to as axis of rotation for short). The machine axis of rotation 20 extends in the axial direction of the electric machine 12. The rotor 16 has a rotor shaft 22, via which the electric machine 12 can provide a drive torque, for example, for driving a motor vehicle, in particular purely electrically.

[0033] The drive device 10 also has a gear 24 provided in the method. The gear 24 is constructed separately from the rotor shaft 22 and is mounted on or at the rotor shaft 22. For this purpose, the gear 24, which is constructed as a spur gear of a spur gear stage, has an internal toothing 26. The rotor shaft 20 has an external toothing 28 corresponding to the internal toothing 26 of the gear 24. In the method, the gear 24 is arranged on the rotor shaft 22 so that the internal toothing 26 meshes with the external toothing 28 or vice versa. The gear 24 and the rotor shaft 22 are thus connected to each other in a rotationally fixed manner. In particular, the internal toothing 26 and the external toothing 28 are plug-in toothings, which are plugged into each other in the axial direction of the rotor shaft 22, so that the gear 24 is mounted on the rotor shaft 22 in the axial direction of the rotor shaft 22.

[0034] The mounting is performed by means of a mounting device 30, which comprises a holding device 32 having a holding plate 34. Figure 2 and Figure 3 3, it can be seen particularly clearly that the holding plate 34 has three second through-openings. The holding plate 34 is fixed to the housing 18 by means of the holding rods 36 of the holding device 32. For this purpose, the holding rods 36 are screwed to the housing 18 and are thus fixed to the housing 18. The holding plate 34 has third through-openings, into which the corresponding length sections L1 of the holding rods 36 are inserted. When the length sections L1 penetrate the corresponding third through-openings of the holding plate 34, nuts 38, which are in the present case designed as wing nuts, are screwed onto the length sections L1 on the side of the holding plate 34 facing away from the housing 18, and the holding plate 34 is pressed against the corresponding stops 40 of the holding rods 36 by means of these nuts. The holding plate 34 is thus fixed to the housing 18.

[0035] The gear 24 has at least three, in this case at least four or exactly four openings. In the method, a retaining pin 42 of the retaining device 32 is provided. The opening of the gear 24 extends in the axial direction of the rotor shaft 22. The retaining pin 42 is inserted through the second through opening of the retaining plate 34 and through the opening of the gear 24, so that, as from Figure 1 As can be seen in FIG. 1 , the retaining pin 42 is inserted into the retaining plate 34 at the same time. Figure 1 The second through opening 44 in the middle and the gear 24 in the Figure 1 The retaining pin 42 penetrates the opening 46 of the gear wheel 24 in the present case. The retaining pin 42 thus cooperates with both the gear wheel 24 and the retaining plate 34 in a form-fitting manner, whereby the gear wheel 24 and via the gear rotor shaft 22 cannot rotate relative to the housing 18 about the machine rotation axis 20.

[0036] The rotor shaft 22 has an internal thread 48 at its free end, particularly in the axial direction of the rotor shaft 22, opposite the stator 14. The internal thread 48 is arranged concentrically with the rotor shaft 22 or with the machine rotation axis 20. A bolt 50, which is configured as a flange / shoulder bolt in the present case and has an external thread 52 corresponding to the internal thread 48, is provided. Figure 1 As indicated by arrow 54, the bolt 50 is screwed in via its outer thread 52 and the corresponding inner thread 48. For this purpose, the retaining plate 34 has a central first through-opening 56, through which the bolt 50 is inserted in the axial direction of the rotor shaft 22. The bolt 50 is then rotated relative to the rotor shaft 22, in particular in the rotational direction about the machine rotation axis 20, so that the bolt 50 is screwed into the corresponding inner thread 48 via its outer thread 52. The gear 24 is thus held in the axial direction of the rotor shaft 22 by means of the bolt 50 in a manner that is at least indirectly, in particular directly, in supporting contact with a stop 58 of the rotor shaft 22, thereby fixing the gear 24 in the axial direction of the rotor shaft 22 at the stop. It can be seen that the corresponding retaining pin 42 is, for example, a corresponding mounting pin, which is used for anti-twist, that is, for torque support, in order to prevent relative rotation between the rotor shaft 22 and the housing 18 in a first rotational direction and in a second rotational direction opposite to the first rotational direction during installation. After the screws 50 have been tightened, in particular with a predeterminable or predetermined tightening torque of, for example, 150 Newton meters ±15 Newton meters, the holding device 32 can be released from the housing 18, in particular so that the holding rods 36 and the holding plates 34 as well as the holding pins 42 are removed. Subsequently, the rotor shaft 22 and the gear wheel 24 connected to the rotor shaft 22 in a rotationally fixed manner can be rotated about the machine axis of rotation 20 relative to the housing 18 and relative to the stator 14.

[0037] Reference numerals list

[0038] 10. Drive device

[0039] 12 Motor

[0040] 14 Stator

[0041] 16 Rotor

[0042] 18 Housing

[0043] 20 Machine rotation axis

[0044] 22 Rotor shaft

[0045] 24 Gear

[0046] 26 Internal teeth

[0047] 28 External teeth

[0048] 30 Installation

[0049] 32 Holding device

[0050] 34 Holding plate

[0051] 36 Retaining rod

[0052] 38 Nut

[0053] 40 Stopper

[0054] 42 Retaining pin

[0055] 44 First penetration opening

[0056] 46 Second through opening

[0057] 48 Internal thread

[0058] 50 Bolts

[0059] 52 External thread

[0060] 54 Arrow

[0061] 56 Fourth penetration opening

[0062] E end

Claims

1. A drive device (10) for a motor vehicle, the drive device comprising: An electric machine (12) comprising a stator (14) and a rotor (16) having a rotor shaft (22); and a gear (24) which is arranged on the rotor shaft (22) and has an internal toothing (26) which meshes with a corresponding external toothing (28) of the rotor shaft (22), so that the gear (24) and the rotor shaft (22) are connected to each other in a rotationally fixed manner, wherein: the gear wheel (24) having at least three openings (46) extending in the axial direction of the rotor shaft (22), into which openings corresponding retaining pins (42) can be inserted during the mounting of the gear wheel (24), the retaining pins being provided to prevent the gear wheel (24) from rotating; - at the free end (E) of the rotor shaft (22), an internal thread (48) is provided in the rotor shaft (22) and is arranged concentrically with the rotor shaft (22); and A bolt (50) is screwed into the internal thread (48), by means of which the gear (24) is held in at least indirect supporting contact with a stopper (58) of the rotor shaft (33) in the axial direction of the rotor shaft (22), so that the gear (24) is fixed to the rotor shaft (22) in the axial direction of the rotor shaft (22), wherein A housing (18) is provided, in which the rotor (16) is at least partially arranged, and wherein The housing (18) has at least three further recesses, by means of which a retaining plate (34) provided for retaining the retaining pin (42) can be fixed to the housing (18) during installation.

2. A mounting device (30) for mounting a drive device (10) according to any one of the above claims, the mounting device comprising: A retaining plate (34), the retaining plate having a first through opening (56), the bolt (50) being able to be inserted through the first through opening; and three retaining pins (42) which can be retained on the retaining plate (34) and can therefore be spatially fixed on the retaining plate and can be inserted into the opening (46) of the gear (24); and three retaining rods (36) which can be fixed on the housing (18) of the electric motor (12) and to which the retaining plate (34) can be connected.

3. A method for installing a drive device (10) for a motor vehicle, in which method: The drive device (10) comprises an electric motor (12) having a stator (14), a rotor (16) and a housing (18); The rotor (16) has a rotor shaft (22), which is at least partially arranged in the housing (18); - providing a gear (24) having an internal toothing (26); - arranging the gear wheel (24) on the rotor shaft (22) in such a way that the internal toothing (26) meshes with a corresponding external toothing (28) of the rotor shaft (28), thereby connecting the gear wheel (24) and the rotor shaft (22) to each other in a rotationally fixed manner; - fixing a holding plate (34) of a holding device (32) having at least three second through-openings (44) to the housing (18); - the gear (24) has at least three openings (46) extending in the axial direction of the rotor shaft (22), in which corresponding retaining pins (42) are inserted, and the retaining pins are also inserted through the second through-openings (44) of the retaining plate (34), so that the retaining pins (42) penetrate the second through-openings (44) and are inserted into the openings (46), and ensure that the gear (24) cannot rotate relative to the housing (18); - at the free end (E) of the rotor shaft (22), an internal thread (48) is provided in the rotor shaft (22) and is arranged concentrically with the rotor shaft (22); and - A bolt (50) is inserted through a first through-opening (56) of the retaining plate (34) and screwed into the internal thread (48), so that the gear (24) is held in the axial direction of the rotor shaft (22) by means of the bolt (50) in at least indirect supporting contact with a stop (58) of the rotor shaft (22), thereby fixing the gear (24) on the rotor shaft (22) in the axial direction of the rotor shaft (22).

4. The method according to claim 3, It is characterized in that The bolt (50) is screwed in the direction of the gear (24) in at least three consecutive screwing phases, wherein the screwing phases differ from one another in terms of the torque applied to screw the bolt (50).

5. The method according to claim 4, It is characterized in that At least one or exactly one loosening phase is provided between at least two or exactly two screwing phases, in which the screw (50) is loosened and thus screwed out of the gear (24).

6. The method according to claim 5, In the loosening phase, the bolt (50) is rotated at least 80 degrees and at most 100 degrees relative to the rotor shaft (22) in order to loosen the bolt (50).

7. The method according to any one of claims 4 to 6, It is characterized in that - in a first of the tightening phases, the bolt (50) is tightened with at least 25 Newton meters and at most 35 Newton meters; - in a second screwing phase of the screwing phase that follows the first screwing phase, The bolt (50) is tightened to at least 63 Newton meters and at most 77 Newton meters; and In a third of the tightening phases, which follows the second tightening phase, the screw (50) is tightened with at least 135 Newton meters and at most 165 Newton meters.

8. The method according to claim 7, It is characterized in that - in the first tightening phase, the bolt (50) is rotated at a speed of at most 200 revolutions per minute and thereby tightened; - in the second tightening phase, the bolt (50) is rotated at a speed of at most 30 revolutions per minute and thereby tightened; and In the third tightening phase, the screw (50) is rotated at a speed of at most 30 revolutions per minute and thus tightened.

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