Electrically operable axle drive train

Abstract

The invention relates to an electrically operable axle drive train for a motor vehicle, comprising an electric machine drivingly connected to a wet-running transmission assembly located in a transmission housing comprising a sump (30) located at the bottom relative to the line of action of gravity (29), and a reservoir (30) in which hydraulic fluid accumulates during operation of the axle drive train, the fluid being sucked out of the reservoir (30) via a suction opening (31). The aim of the invention is to improve functionally in terms of an electrically operable axle drive train, in particular in terms of cooling and / or lubrication of the axle drive train. This object is achieved in that a guide structure (32) is provided in the reservoir (30) upstream of the suction opening (31), by means of which guide structure the distance through which the hydraulic fluid must pass in the reservoir (30) to the suction opening (31) is significantly increased.

Description

TECHNICAL FIELD

[0001] The invention relates to an electrically operable axle drive for a motor vehicle, having an electric machine which is drivingly connected to a transmission assembly which is arranged in a transmission housing, which comprises a sump which is arranged at the bottom relative to the line of action of the force of gravity, in which sump hydraulic fluid collects during operation of the axle drive and is sucked out of the sump via a suction opening. BACKGROUND

[0002] Electric motors are increasingly used to drive motor vehicles in order to form an alternative to internal combustion engines which require fossil fuels. Considerable efforts have been made to improve the suitability of electric drives for everyday use and to also be able to provide users with the driving comfort to which they are accustomed.

[0003] A detailed description of electric drives can be found in the article entitled "Hochintegrativ und Flexibel Elektrische Antriebseinheit für E-Fahrzeuge" [Highly Integrative and Flexible Electric Drive Unit for Electric Vehicles] by Erik Schneider, Frank Fickl, Bernd Cebulski and Jens Liebold, published in the German automotive magazine ATZ, Volume 113, May 2011, pages 360 to 365, which is probably the closest prior art. This article describes a drive unit for an axle of a vehicle, which comprises an electric motor which is arranged concentrically and coaxially with a bevel differential, wherein a switchable 2-speed planetary gear is arranged in the power train between the electric motor and the bevel differential, and which planetary gear is also located coaxially with the electric motor or the bevel differential or a spur differential. This drive unit is very compact and achieves a good compromise between climbing ability, acceleration and energy consumption due to the switchable 2-speed planetary gear. This drive unit is also referred to as an electric axle or an electrically operable drive train.

[0004] DE 10 2010 048 837 A1 discloses such a drive arrangement having at least one electric motor and at least one planetary differential that can be driven by a rotor of the electric motor, wherein the planetary differential has at least one planet carrier that is operatively connected to the rotor of the electric motor, a first and a second planet gear that are mounted in a rotatable manner on the planet carrier, and a first and a second sun gear, each of which is operatively connected to an output shaft of the planetary differential. In this regard, the first planet gears are in tooth engagement with the first sun gear, and each of the second planet gears is in tooth engagement with the second sun gear and with one of the first planet gears. Furthermore, the sun gears are arranged coaxially to the rotational axis of the rotor.

[0005] In order to ensure operation and lifetime of such a vehicle gear box, proper oiling or lubrication of the gears and bearings within the planetary gear box must be ensured. Various methods exist in the current state of the art to achieve this purpose, including the design of oil baffle plates and / or oil holes to form a defined oil path for the lubricating oil. In a passive oiled gear box, which operates in an oil bath, the oil is distributed throughout the gear box by rotating components such as planetary stages, gears, etc. Depending on the oil level, some components are covered by oil. The oil is then transferred to the bearings and / or transmissions (tooth engagements) via the oil baffle plates and / or oil holes. Depending on the operating point (low speed, uphill / downhill driving, cornering, etc.), the oil level in the gear box, the arrangement and / or design of the gear box components, it cannot be guaranteed that enough oil is supplied to the bearings and gears.

[0006] For example, dynamic driving situations such as acceleration, braking or cornering can cause the oil in the reservoir of the axle drive train to be excited and transported via the overflow into the gear box area for extraction, which can lead to undesired churning losses in the planetary gear box.

[0007] German patent application DE 10 2015 221 901 A1 discloses a delivery device for delivering oil from an oil sump to a consumer of an internal combustion engine or a gear box of a motor vehicle, the delivery device having an oil pump which can be driven by a mechanical direct drive and a switchable electric drive. The oil pump has a rotor and a rotor portion around the rotor, i.e. two components which can be moved relative to each other for delivering oil, and the mechanical direct drive is connected to a first of the components which can be moved relative to each other, and the switchable electric drive is connected to a second of the components which can be moved relative to each other. The housing has a housing section which is open on one side and has a large internal cross section for introducing the components of the oil pump, and the housing has a housing base or a housing cover with a constricted section with a comparatively small internal cross section, and on the constricted section a sealing ring is arranged for separating a pressure side from a suction side of the oil pump. SUMMARY

[0008] It is an object of the present application to improve the electrically operated axle drive train according to the preamble of patent claim 1, in particular with regard to the cooling and / or lubrication of the electrically operated axle drive train.

[0009] The object is achieved by an electrically operated axle drive for a motor vehicle, which has an electric machine which is drivingly connected to a wet-running transmission assembly which is arranged in a transmission housing, which comprises a sump which is arranged at the bottom with respect to the line of action of the force of gravity, in which sump hydraulic fluid collects during operation of the axle drive and is sucked out of the sump via a suction opening, so that an in sump upstream of the suction opening a guide structure is provided, by means of which the distance which the hydraulic fluid has to travel in the sump to reach the suction opening is significantly increased. The hydraulic fluid is used in the transmission housing to cool and / or lubricate the gear box components. The hydraulic fluid can be hydraulic oil. However, it can also be water. The hydraulic fluid which is sucked out of the sump can advantageously be cooled in a suitable circuit, for example by means of a heat exchanger. A pump in the circuit is used, for example, to suck out the hydraulic fluid. During operation of the axle drive, it has been found that the hydraulic fluid in the sump froths in an undesirable manner. This froth, which is also known as oil foam, can lead to the wet space in the gear box housing being flooded with hydraulic fluid to such an extent that the required cooling and / or lubrication function is no longer guaranteed or is no longer sufficiently guaranteed. In addition, the froth leads to a reduction in the specific heat capacity of the hydraulic fluid. A higher oil level in the wet space of the gear box housing also leads to stirring losses. In addition, the hydraulic fluid can leak in an undesirable manner, for example through the vent opening. Due to the stress guide structure and the resulting extension of the oil path, the oil can flow out of the region with dynamically moving gear box components in a desired manner. The guide structure advantageously comprises additional ribs and / or openings to slow down the discharge of the hydraulic fluid. The resulting calming of the hydraulic fluid can prevent undesirable frothing. The guide structure can particularly advantageously be used, in particular in combination with a separating device, which is designed as a solid seal, for example, to form a labyrinth for the hydraulic fluid on the way to the suction opening.

[0010] The preferred exemplary embodiment of the electrically operable axle drive is characterized in that the guide structure has an upper guide rib which, like a roof, shelters the sump from above with respect to the line of action of the force of gravity, but does not completely close off the sump from above, wherein a radial passage opening in the direction of the sump remains free. The term radial refers to the axis of rotation or the axis of the ring gear of the transmission assembly. Radial means transverse to the axis of rotation. Similarly, axial means in the direction of the axis of rotation or in a direction parallel to the axis of rotation. The radial passage opening is advantageously arranged offset from the suction opening. The upper guide rib can be used in a simple manner to significantly lengthen the path of the fluid to the suction opening, which is designed as a suction hole, for example.

[0011] A further preferred exemplary embodiment of the electrically operable axle drive train is characterized in that the transmission housing comprises an engine-side housing shell and a gear box-side housing shell, wherein a sealing device sealing a wet space is arranged between the two housing shells. An annular gear belonging to a planetary gear box or epicyclic gear box is formed in the gear box-side housing shell. The sealing device seals the wet space and the sump from the environment. The sealing device known per se prevents an undesired leakage of hydraulic fluid from the wet space and the sump.

[0012] A further preferred exemplary embodiment of the electrically operable axle drive train is characterized in that a separating device is arranged between the two housing shells, which separates the sump into two cavities in a separating plane between the housing shells, so that the hydraulic fluid in the sump is three-dimensionally deflected in a labyrinth-like manner on the way to the suction opening. In this way, it is possible to ensure in a simple manner that the hydraulic fluid flows alternately through the cavity on the gear box side and the cavity on the engine side on the way to the suction opening.

[0013] A further preferred exemplary embodiment of the electrically operable axle drive train is characterized in that the separating device comprises at least one axial passage opening, which is arranged below the radial passage opening in the sump with respect to the action line of the force of gravity. This makes it easy to achieve the desired passage of the hydraulic fluid in the axial direction. The flow through or around the guide structure can be adjusted or adapted via the size and / or the number of the passage openings using simple design and manufacturing techniques.

[0014] A further preferred exemplary embodiment of the electrically operable axle drive train is characterized in that the separating device comprises at least one axial passage opening, which is arranged in the sump at least partially overlapping the suction opening in the sump. This, among other advantages, provides the advantage that the suction opening can be delimited or closed by means of the guide structure to ensure the desired calming of the hydraulic fluid in the sump in front of the suction opening.

[0015] A further preferred exemplary embodiment of the electrically operable axle drive train is characterized in that the upper rib extends in the extension of a circular-arc-shaped sealing track, which is provided on the annular gear incorporated into the gear box-side housing shell. This simplifies the production of the gear box-side housing shell with the upper rib.

[0016] A further preferred exemplary embodiment of the electrically operable axle drive train is characterized in that the guide structure has a lower guide rib with respect to the action line of the force of gravity, which delimits a calming volume for the hydraulic fluid in the sump. This can further effectively slow down the outflow of the hydraulic fluid. The calming volume is advantageously less than half of the sump volume in the gear box housing.

[0017] A further preferred exemplary embodiment of the electrically operable axle drive is characterized in that the upper guide rib is at least one third longer in the circumferential direction than the lower guide rib. This has proven to be particularly advantageous in combination with the previously described offset arrangement of the radial passage opening relative to the suction opening.

[0018] The application also relates to a transmission housing, in particular a gear box side housing shell or an engine side housing shell, a sealing device and / or a separating device for the above-mentioned electric axle drive. The separating device is advantageously combined with the above-mentioned sealing device. The mentioned parts can be handled separately.

[0019] In particular, the electric machine is intended for use within an electrically operable drive train of a motor vehicle. In particular, the electric machine is dimensioned such that a vehicle speed of more than 50 km / h, preferably more than 80 km / h, and in particular more than 100 km / h can be achieved. The electric motor has in particular preferably an output of more than 30 kW, preferably more than 50 kW, and in particular more than 70 kW. Furthermore, it is preferred that the electric machine provides a rotational speed of more than 5,000 rpm, particularly preferably more than 10,000 rpm, very particularly preferably more than 12,500 rpm.

[0020] The transmission assembly of the electric axle drive can in particular be coupled to an electric machine which is designed to generate a drive torque for the motor vehicle. The drive torque is in particular preferably a main drive torque, such that the motor vehicle is driven exclusively by this drive torque.

[0021] Furthermore, the gear box can preferably be configured as a planetary gear box or comprise a planetary gear box. The planetary gear box can preferably have a sun gear and a plurality of planet gears, which mesh with the sun gear and are mounted in a rotatable manner in a planet gear carrier, the planet gears rotating around the sun gear, and a ring gear, which is arranged coaxially to the sun gear, the planet gears rolling in the ring gear.

[0022] The transmission assembly can comprise a differential gear box. The differential gear box is a planetary gear box with one drive and two outputs. The differential gear box usually has the function of driving two wheels of a motor vehicle such that the wheels can rotate at different speeds when cornering, but have the same propulsion.

[0023] According to a further preferred further development of the application, the differential gear box can be formed as a spur gear differential gear box. Alternatively, it can also be provided according to an equally advantageous embodiment of the application that the differential gear box is formed as a bevel gear differential gear box.

[0024] The planetary gearbox according to the application is preferably configured for use in a transmission assembly of an axle drive train. In addition to the planetary gearbox according to the application, the transmission assembly can also comprise further gearboxes, as described above.

[0025] The sun gear is preferably mounted in a rotatable manner via at least one rolling bearing. Rolling bearings of this type can be used in particular to achieve rotational movement with as low a frictional loss as possible. Rolling bearings can be used in particular to secure and / or mount axles and shafts, and depending on the design, can absorb radial and / or axial forces and at the same time enable rotation of the shaft or of a component mounted in this way on the axle.

[0026] According to an advantageous embodiment of the application, it can be provided that the first housing shell is formed from a metal casting. The technical advantage is that a metal casting housing shell has a high strength and stiffness and is therefore very suitable for absorbing high loads in the planetary gearbox. The high stiffness of the housing allows the precision of the gearbox to be improved and higher performance to be achieved with smaller dimensions. In addition, a metal casting offers good heat dissipation, which is beneficial for a longer service life of the gearbox. BRIEF DESCRIPTION OF DRAWINGS

[0027] Further advantages, features and details of the application are apparent from the following description of various exemplary embodiments, with reference to the drawings. In the drawings:

[0028] Figure 1 A motor vehicle with an electric axle drive train is shown in a schematic block diagram;

[0029] Figure 2 A planetary gearbox with a stepped planetary gear is shown in a schematic axial sectional view;

[0030] Figure 3 A planetary gearbox is shown in an axial sectional view;

[0031] Figure 4 A detailed view of a housing shell of a transmission housing is shown in a perspective view;

[0032] Figure 5 An enlarged section of Figure 4 is shown, in which the sump is equipped with additional guide structures for extending the path of the lubricating medium leading to the suction opening in the plan view of the engine-side housing shell;

[0033] Figure 6 A similar plan view of the gearbox-side housing shell is shown;

[0034] Figure 7 A detailed view of Figure 6Analogous representation, in which the arrows serve to illustrate the path of the lubricating medium through the sump to the suction opening; and

[0035] Figure 8 and Figure 9 Two alternative embodiments of the guiding structure in the sump are shown. DETAILED DESCRIPTION

[0036] Figure 1 A motor vehicle 2 is shown in which an electrically operable axle drive train 1 is present, which comprises an electric machine 3 and a transmission assembly 4 coupled to the electric machine 3, which forms a structural unit with the electric machine 3. The transmission assembly 4 comprises a planetary gear 5 which is operated wet, which has an internally toothed ring gear 6, as is also shown in Figure 2 .

[0037] The planetary gear 5 has a sun gear 24 and a plurality of planet gears 22 which are in engagement with the sun gear 24 and are mounted in a rotatable manner in a planet carrier 23, which move in rotation around the sun gear 24, and a ring gear 6 which is arranged coaxially to the sun gear 24, in which the planet gears 22 roll.

[0038] As can be seen from Figure 3 , the ring gear 6 is accommodated in a transmission housing 7 which has two parts, a first housing shell 8 and a second housing shell 9, which are designed in such a way that, for the assembly of the planetary gear 5, the ring gear 6 can be inserted into the first housing shell 8 or the second housing shell 9 in the axial direction, which is clearly visible from the combination of Figure 3 and Figure 4 .

[0039] To this end, the first housing shell 8, which is formed from a metal casting, has a circular recess 10 which has a radially inner, axially extending lateral surface 11 and a radially outer, axially extending lateral surface 12, wherein the ring gear 6 is supported axially against the radially inner lateral surface 12 of the recess 10 and the outer lateral surface 12 has, in the upper half of the recess 10, in the direction of gravity, at least one inflow opening 13 for hydraulic fluid 14 and, in the lower half of the recess 10, in the direction of gravity, at least one outflow opening 15 for hydraulic fluid 14. The second housing shell 9 rests against the radially outer lateral surface 12 of the recess 10, so that a cylindrical annular channel is defined by the recess 10, the ring gear 6 and the second housing shell 9. The first housing shell 8 and the second housing shell 9 have a contact surface 21 which extends essentially in a radial plane 20.

[0040] The annular recess 10 is formed in one piece, in particular integrally, with the first housing shell 8. As can be seen inFigure 4 In the transmission housing 7, as shown in the figures, a high tank 16 for storing hydraulic fluid 14 is arranged, which in its upper region has an overflow opening 17 hydraulically connected to the inlet opening 13 in the direction of gravity. In driving dynamic situations, such as during acceleration, braking or cornering, the hydraulic fluid 14 located in the high tank 16 of the axle drive train 1 can be transported into the gearbox region via the overflow opening 17. In order to prevent undesirable churning losses in the planetary gearbox 5, the hydraulic fluid 14 is not guided into the gear interior in an uncontrolled manner, but in a controlled manner via the groove 10 onto a hydraulic path that runs through the planetary gearbox 5 in the circumferential direction, and the interior of the ring gear 6 and thus also the interior of the planetary gearbox 5 are not subjected to this "overflowing" hydraulic fluid 14. This can be clearly seen from the Figure 4 dashed arrows in the figures, which outline the mentioned hydraulic path.

[0041] The radially inner lateral surface 11 has at least one discharge opening 18 for the hydraulic fluid 14 in the lower half of the groove 10 in the direction of gravity, so that the hydraulic fluid 14 can flow downward from the interior of the gearbox due to gravity. The groove 10 opens in its lower half in the direction of gravity to a suction reservoir 19 from which the hydraulic fluid 14 can be pumped back into the high tank 16.

[0042] In Figure 5 and Figure 6 the gravity is indicated with arrows 29. The transmission housing shells 8 and 9 and their lower end region define a tank 30 in the transmission housing. The tank 30 comprises an engine-side cavity 43 and a gearbox-side cavity 44. In Figure 5 it can be seen that the engine-side cavity 43 in the tank 30 is equipped with a guide structure 32.

[0043] The guide structure 32 comprises an upper guide rib 38 and a lower guide rib 48. The upper guide rib 38 extends in the extension of a sealing rib 37, which is formed in the interior of the engine-side housing shell 8, as can be seen in Figure 5 The sealing rib 37 essentially has a circular arc shape and is in sealing contact with the gearbox-side housing shell 9 in the assembled state of the gearbox housing with interposed sealing means.

[0044] Figure 6 A sealing track 40 is shown with the sealing means. The sealing means with the sealing track 40 serve to seal a wet space 41 in the gearbox housing. The wet space 41 contains hydraulic fluid, which collects in the tank 30 during operation of the axle drive train and is suctioned out of the tank via a suction opening 31. As can be seen in Figure 5 the suction opening 31 is arranged at the lower right end of the tank 30. The suction opening 31 is also encompassed by the circle 28 to make the position of the suction opening 31 clear.

[0045] In Figure 5 It can be seen in that the upper guide rib 38, also referred to as the upper rib 38 for short, extends in the extension of the sealing rib 37 from right to left in the direction of the sealing rib 50, so that Figure 5 The radial passage openings 39 in are free from the top to the bottom from the wet space 41 into the sump 30. The lower guide rib 48, on the other hand, begins with the sealing rib 52 and extends to the sealing rib 51. This ensures that the lower guide rib 48 delimits a calm volume 49 for the hydraulic fluid in the gearwheel gearbox of the suction opening 31.

[0046] In Figure 6 The guide structure 32 is indicated by dashed lines only. The guide structure 32 can be designed in this way or in a similar way. In the dashed-line representation of the guide structure 32, the radial passage openings 39 are missing. The radial passage openings 39 can also be represented by slots or openings in the upper guide rib. In Figure 6 It can be seen in that a separation device 42 is arranged in the sump between the two housing shells.

[0047] The separation device 42 is advantageously connected integrally with the sealing device. Thus, the separation device 42 is designed, for example, as a solid seal. In Figure 6 In the axial passage openings 45, 46, 47 in the separation device 42 are indicated by circles. The axial passage opening 45 allows the hydraulic fluid to enter the cavity 44. The axial passage opening 47 allows the hydraulic fluid to enter the suction opening. The axial passage openings 45 to 47 shown only can vary in size, shape and number.

[0048] In Figure 7 The arrow 33 indicates how the hydraulic fluid flows from above from the wet space 41 into the sump 30. The dashed arrow 34 indicates how the hydraulic fluid is deflected in a labyrinthine manner in the sump 30 before it reaches the suction opening through the axial passage opening 47.

[0049] In Figure 7 The air bubbles 35 are indicated by circles, which are advantageously scraped off in a planar manner on the indicated lower guide rib 48. In addition, Figure 7 The ellipses in indicate that axial passage openings of different design can also be arranged between the two axial passage openings 45 and 47, which are formed as circles.

[0050] Figure 8 And Figure 9 It is shown how the guide structure 32 can be realized in the sump by means of additional components 55, 56. The components 55, 56 are made of plastic material, for example, and are inserted into the engine-side housing shell 8 to represent the guide structure 32. However, in mass production, the guide structure 32 shown in Figure 5 is more cost-effective, which is preferably made of a metal casting material.

[0051] List of reference signs

[0052] 1 axle drive train

[0053] 2 motor vehicle

[0054] 3 electric machine

[0055] 4 transmission assembly

[0056] 5 planetary gearbox

[0057] 6 ring gear

[0058] 7 transmission housing

[0059] 8 housing shell

[0060] 9 housing shell

[0061] 10 recess

[0062] 11 lateral surface

[0063] 12 lateral surface

[0064] 13 inlet opening

[0065] 14 hydraulic fluid / lubricating medium

[0066] 15 outflow opening

[0067] 16 high reservoir

[0068] 17 overflow opening

[0069] 18 outflow opening

[0070] 19 entry reservoir

[0071] 20 radial plane

[0072] 21 contact surface

[0073] 22 planet gear

[0074] 23 planet gear carrier

[0075] 24 sun gear

[0076] 28 circle

[0077] 29 gravity

[0078] 30 reservoir

[0079] 31 suction opening

[0080] 32 guide structure

[0081] 33 arrow

[0082] 34 dashed arrow

[0083] 35 circle

[0084] 36 axial passage opening

[0085] 37 sealing rib

[0086] 38 upper guide rib

[0087] 39 radial passage opening

[0088] 40 sealing track

[0089] 41 wet space

[0090] 42 separating device

[0091] 43 cavity

[0092] 44 cavity

[0093] 45 axial passage opening

[0094] 46 axial passage opening

[0095] 47 axial passage opening

[0096] 48 lower guide rib

[0097] 49 calm volume

[0098] 50 sealing rib

[0099] 51 sealing rib

[0100] 52 sealing rib

[0101] 55 component

[0102] 56 component

Claims

1. An electrically operable axle drivetrain (1) for a motor vehicle (2), the axle drivetrain having a motor (3) drivably connected to a wet-operated drive assembly (4) arranged in a drive housing (7), the drive housing including a reservoir (30) arranged at the bottom relative to the line of action of gravity (29), in which hydraulic fluid (14) accumulates during operation of the axle drivetrain (1), and is drawn out from the reservoir (30) via a suction opening (31), characterized in that, A guide structure (32) is provided in the storage tank (30) upstream of the suction opening (31), and by means of the guide structure, the distance that the hydraulic fluid (14) must travel in the storage tank (30) to reach the suction opening (31) is significantly increased.

2. The electrically operable axle drive system according to claim 1, characterized in that, The guide structure (32) has an upper guide rib (38) relative to the line of action of gravity (29), which covers the reservoir (30) from above in a roof-like manner, but does not completely close the reservoir (30) from above, wherein the radial passage opening (39) remains free in the direction of the reservoir.

3. The electrically operable axle drive system according to claim 2, characterized in that, The transmission housing (7) includes an engine-side housing (8) and a gearbox-side housing (9), wherein a sealing device for sealing a wet space (41) is arranged between the two housings (8, 9).

4. The electrically operable axle drive system according to claim 3, characterized in that, A separation device (42) is arranged between the two outer shells (8, 9), which divides the storage tank (30) into two chambers (43, 44) in the separation plane between the outer shells (8, 9), so that the hydraulic fluid (14) in the storage tank (30) is deflected in a labyrinthine manner on its way to the suction opening (31).

5. The electrically operable axle drive system according to claim 4, characterized in that, The separation device (42) includes at least one axial passage opening (36, 45, 46), which is arranged in the storage tank (30) below the radial passage opening (36, 35, 46) relative to the line of action of gravity (29).

6. The electrically operable axle drive system according to claim 4 or 5, characterized in that, The separation device (42) includes at least one axial passage opening (47) arranged in the reservoir (30) to at least partially overlap with the suction opening (31) in the reservoir (30).

7. The electrically operable axle drive system according to any one of claims 2 to 6, characterized in that, The upper rib (38) extends in the extension of the arc-shaped sealing track (40), which is disposed on the ring gear (6) that is coupled to the gearbox side housing (9).

8. The electrically operable axle drive system according to any one of claims 2 to 7, characterized in that, The guide structure (32) has a lower guide rib (48) relative to the line of action of gravity (29), which defines a calm volume (49) for hydraulic fluid (14) in the reservoir (30) in front of the suction opening (31).

9. The electrically operable axle drive system according to any one of claims 2 to 7, characterized in that, The upper guide rib (48) is at least one-third longer than the lower guide rib (38) in the circumferential direction.

10. A gearbox housing (7), particularly a gearbox-side housing (8) or an engine-side housing (9), a sealing device and / or a separation device (42) for an electric vehicle shaft drive system (1) according to any one of the preceding claims.

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