Electrically operated axle drive train

Abstract

The invention relates to an electrically operated axle drive train for a motor vehicle, with an electric machine which is driven by a wet-running gearbox arrangement which is arranged in a gearbox housing which includes a sump (30) arranged at the bottom with respect to a line of action of an earth's gravity (29), in which a hydraulic fluid collects during operation of the axle drive train and is extracted from the sump (30) via a suction opening (31). In order to improve the functionality of the electrically operated axle drive train, particularly with regard to its cooling and / or lubrication, a guide structure (32) is provided upstream of the suction opening (31) in the sump (30), with the help of which a path of the hydraulic fluid in the sump (30) to the suction opening (31) is significantly extended.

Description

[0001] The invention relates to an electrically operated axle drive train for a motor vehicle, comprising an electric machine which is driven by a wet-running gearbox arrangement which is arranged in a gearbox housing which includes a sump arranged at the bottom with respect to a line of action of the Earth's gravity, in which a hydraulic fluid collects during operation of the axle drive train and which is extracted from the sump via a suction opening.

[0002] Electric motors are increasingly being used for propulsion in motor vehicles to create alternatives to combustion engines that require fossil fuels. Considerable efforts have already been made to improve the everyday usability of electric drives and to offer users the familiar driving comfort.

[0003] A detailed description of an electric drive system can be found in an article in the journal ATZ, Volume 113, 05 / 2011, pages 360-365, by Erik Schneider, Frank Fickl, Bernd Cebulski, and Jens Liebold, entitled: "Highly Integrated and Flexible Electric Drive Unit for E-Vehicles," which likely represents the next state of the art. This article describes a drive unit for one axle of a vehicle, comprising an electric motor arranged concentrically and coaxially to a bevel gear differential. A switchable two-speed planetary gear set is located in the power train between the electric motor and the bevel gear differential, also positioned coaxially to the electric motor and the bevel or spur gear differential. The drive unit has a very compact design and, thanks to the switchable two-speed planetary gear set, allows for a good compromise between climbing ability, acceleration, and energy consumption.Such drive units are also referred to as e-axles or electrically operated drive trains.

[0004] From DE 10 2010 048 837 A1, such a drive device is known, comprising at least one electric motor and at least one planetary differential driven by a rotor of the electric motor. The planetary differential has at least one planet carrier operatively connected to a rotor of the electric motor, first planet gears and second planet gears rotatably mounted on the planet carrier, and a first sun gear and a second sun gear, each of which is operatively connected to an output shaft of the planetary differential. The first planet gears mesh with the first sun gear, and each of the second planet gears meshes with the second sun gear and with one of the first planet gears. Furthermore, the sun gears are arranged coaxially with a rotational axis of the rotor.

[0005] To ensure the operation and longevity of such vehicle transmissions, adequate lubrication of the gears and bearings within a planetary gearbox must be guaranteed. Various approaches exist to achieve this in the current state of the art, including oil baffles and / or oil passages designed to create a defined oil path for the lubricating oil. In a passively lubricated gearbox running in an oil bath, the oil is distributed throughout the gearbox by the rotating components, such as the planetary stages, gears, etc. Depending on the oil level, some components are partially covered with oil. The oil is then conveyed via oil baffles and / or oil passages to the bearings and / or the gear teeth (tooth engagement). The specific oil flow depends on the operating conditions (low speeds, uphill / downhill driving, cornering, etc.).Due to the oil level in the gearbox, the arrangement and / or design of the gearbox components, an adequate oil supply to bearings and gears is not guaranteed.

[0006] For example, driving dynamics situations such as acceleration, braking or cornering can cause oil in a reservoir of the axle drive train to be agitated and transported via an overflow into the gearbox area for extraction, which can lead to unwanted splashing losses in the planetary gearbox.

[0007] German patent application DE 10 2015 221 901 A1 discloses a conveying device for conveying oil from an oil sump to a consumer of an internal combustion engine or a transmission of a motor vehicle, comprising an oil pump driven by a mechanical direct drive and by a switchable electric drive, wherein the oil pump has two components for conveying the oil, a rotor and a rotor element surrounding the rotor, and the mechanical direct drive is connected to a first of the components that are movable relative to each other, and the switchable electric drive is connected to a second of the components that are movable relative to each other.wherein a housing has a shell section open on one side with a large internal cross-section for the insertion of the components of the oil pump and wherein the housing has a housing bottom or housing cover with a constriction section having a comparatively small internal cross-section and wherein a sealing ring for separating the pressure side of the oil pump from a suction side is arranged at the constriction section.

[0008] Publications DE 10 2021 202 837 A1, DE 10 2011 055 192 A1, DE 10 2019 204 189 A1, DE 10 2019 212 670 A1 and DE 10 2018 119 186 A1 disclose an electrically operated axle drive train for a motor vehicle, comprising an electric motor and a wet-running transmission assembly located in a transmission housing. The housing includes a sump located at the bottom relative to a line of action of gravity, in which a hydraulic fluid collects during operation of the axle drive train and is extracted from the sump via a suction opening. Upstream of the suction opening, a guide structure is provided in the sump, which extends the path of the hydraulic fluid within the sump to the suction opening.

[0009] From DE 10 2019 114 476 A1, a hybrid transmission with a transmission oil sump featuring a guide structure in the form of a cover element is known. Additionally, a separating element is provided, which divides the sump into a collection chamber and an intake chamber.

[0010] The object of the invention is to functionally improve an electrically operated axle drive train according to the preamble of claim 1, in particular with regard to its cooling and / or lubrication.

[0011] The problem, in an electrically operated axle drive train for a motor vehicle, with an electric motor driven by a wet-running gearbox assembly housed in a gearbox housing, is solved by providing a guide structure upstream of the suction opening in the sump. This guide structure significantly lengthens the path of the hydraulic fluid within the sump to the suction opening. The hydraulic fluid serves to cool and / or lubricate gearbox components within the gearbox housing. The hydraulic fluid could be hydraulic oil or water.The hydraulic fluid extracted from the sump can be advantageously cooled in a suitable circuit, for example, using a heat exchanger. A pump in this circuit is used, for instance, to extract the hydraulic fluid. During operation of the axle drive train, it has been observed that the hydraulic fluid in the sump foams up in an undesirable manner. This foaming, also known as oil foaming, can cause a wet chamber in the gearbox housing to become so flooded with hydraulic fluid that the necessary cooling and / or lubrication functions are no longer guaranteed, or no longer sufficiently ensured. Furthermore, the foaming reduces the heat capacity of the hydraulic fluid. A higher oil level in the wet chamber of the gearbox housing can also lead to churning losses. Additionally, hydraulic fluid can escape in an undesirable manner, for example, through a vent.The guide structure and the resulting extension of the oil path allow the oil to flow slowly and as desired from an area with dynamically moving transmission components. The guide structure advantageously includes additional ribs and / or openings to slow the flow of the hydraulic fluid. The resulting stabilization of the hydraulic fluid prevents undesirable foaming. Particularly advantageously, the guide structure, especially in combination with a separating device, such as a solid seal, can create a labyrinth for the hydraulic fluid on its way to the suction opening.

[0012] The guide structure features an upper guide rib, positioned relative to the line of action of gravity, which forms a roof-like shield over the sump without completely sealing it off, leaving a radial opening open towards the sump. The term "radial" refers to an axis of rotation or the axis of a ring gear in the transmission assembly. "Radial" means perpendicular to the axis of rotation. Similarly, "axial" means in the direction of or parallel to the axis of rotation. The radial opening is advantageously positioned offset from the suction opening. This allows the upper guide rib to significantly lengthen the fluid path to the suction opening, which, for example, is designed as a suction bore.

[0013] Furthermore, the gearbox housing comprises a motor-side and a gearbox-side housing shell, with a sealing device arranged between the two housing shells to seal a wet chamber. A ring gear, belonging to a planetary or epicyclic gear unit, is formed in the gearbox-side housing shell. The sealing device seals the wet chamber and the sump from the environment. This sealing device, which is known per se, prevents unwanted leakage of hydraulic fluid from the wet chamber and the sump.

[0014] Additionally, a separating device is arranged between the two housing shells, dividing the sump into two cavities in a dividing plane between the housing shells. This causes the hydraulic fluid in the sump to be deflected in a labyrinthine, three-dimensional pattern on its way to the suction opening. In this way, a simple mechanism ensures the alternating flow of hydraulic fluid through both the gearbox-side and motor-side cavities on the way to the suction opening.

[0015] The problem, in the case of an electrically operated axle drive train for a motor vehicle, with an electric machine which is driven by a wet-running gearbox assembly arranged in a gearbox housing which includes a sump located at the bottom relative to the line of action of gravity, in which a hydraulic fluid collects during operation of the axle drive train and is drawn out of the sump via a suction opening, is also solved by providing a guide structure upstream of the suction opening in the sump, with the aid of which the path of the hydraulic fluid in the sump to the suction opening is significantly extended and the guide structure has a guide rib at the top relative to the line of action of gravity, which shields the sump upwards like a roof, but without completely enclosing the sump at the top.wherein a radial passage opening towards the sump remains free and the upper rib extends in line with a circular arc sealing track provided on a ring gear integrated into the gearbox-side housing shell. This simplifies the manufacture of the gearbox-side housing shell with the upper rib.

[0016] Another preferred embodiment of the electrically operated axle drive train is characterized in that the separating device comprises at least one axial passage opening, which is arranged in the sump below the radial passage opening with respect to the line of action of gravity. This allows the desired flow of hydraulic fluid in the axial direction to be achieved in a simple manner. The flow through or around the guide structure can be adjusted or adapted by simple design and manufacturing means via the size and / or number of multiple passage openings.

[0017] Another preferred embodiment of the electrically operated axle drive train is characterized in that the separating device comprises at least one axial through-opening which is arranged in the sump in at least partial overlap with the suction opening in the sump. This offers, among other advantages, that the suction opening can be limited or enclosed by means of the guide structure in order to ensure the desired stabilization of the hydraulic fluid in the sump upstream of the suction opening.

[0018] Another preferred embodiment of the electrically operated axle drive train is characterized in that the guide structure has a lower guide rib, relative to the line of action of gravity, which defines a settling volume for the hydraulic fluid in the sump. This further effectively slows the flow of the hydraulic fluid. The settling volume is advantageously less than half the sump volume in the gearbox housing.

[0019] Another preferred embodiment of the electrically operated axle drive train is characterized in that the upper guide rib is at least one-third longer in a circumferential direction than the lower guide rib. This has proven particularly advantageous in combination with the previously described offset arrangement of the radial passage opening relative to the extraction opening.

[0020] The invention further relates to a gearbox housing, in particular a gearbox-side or motor-side housing shell, a sealing device, and / or a separating device for a previously described electric axle drive train. The separating device is advantageously combined with the previously described sealing device. The aforementioned parts are available separately.

[0021] The electric machine is intended for use within an electrically powered drivetrain of a motor vehicle. In particular, the electric machine is dimensioned to enable vehicle speeds greater than 50 km / h, preferably greater than 80 km / h, and especially greater than 100 km / h. The electric motor preferably has a power output greater than 30 kW, preferably greater than 50 kW, and especially greater than 70 kW. It is further preferred that the electric machine provides rotational speeds greater than 5,000 rpm, particularly preferably greater than 10,000 rpm, and most preferably greater than 12,500 rpm.

[0022] The transmission arrangement of the electric axle drive train can be coupled, in particular, to the electric machine, which is designed to generate drive torque for the motor vehicle. This drive torque is preferably a primary drive torque, so that the motor vehicle is driven exclusively by the drive torque.

[0023] The transmission can preferably be configured as a planetary gear set or comprise a planetary gear set. The planetary gear set can preferably include a sun gear and several planet gears meshing with the sun gear and rotatably mounted in a planet gear carrier, which rotate around the sun gear, as well as a ring gear arranged coaxially to the sun gear in which the planet gears roll.

[0024] The transmission assembly may include a differential gear. A differential gear can, in particular, be a planetary gear with one input and two outputs. Its function is usually to drive two wheels of a motor vehicle in such a way that they can rotate at different speeds when cornering, but with the same tractive force.

[0025] According to a further preferred embodiment of the invention, the differential gear can also be designed as a spur gear differential. Alternatively, according to another advantageous embodiment of the invention, the differential gear can be designed as a bevel gear differential.

[0026] The planetary gear unit according to the invention is preferably configured for use in a gear arrangement of an axle drive train. In addition to the planetary gear unit according to the invention, the gear arrangement can also include further gear units as described above.

[0027] The sun gear is preferably rotatably mounted on at least one rolling bearing. Such rolling bearings can be used in particular to enable rotary movements with the lowest possible friction losses. Rolling bearings can be used in particular for fixing and / or supporting axles and shafts, whereby, depending on their design, they absorb radial and / or axial forces and simultaneously allow the rotation of the shaft or the components thus mounted on an axle.

[0028] According to an advantageous embodiment of the invention, the first housing shell can be formed from a metal casting. The technical advantage lies in the fact that a metal casting housing shell exhibits high strength and rigidity and is therefore well suited to withstand the high loads in the planetary gearbox. The high rigidity of the housing improves the accuracy of the gearbox and allows for higher performance with smaller dimensions. Furthermore, the metal casting offers good heat dissipation, which is beneficial for a longer gearbox service life.

[0029] Further advantages, features, and details of the invention will become apparent from the following description, in which various embodiments are described in detail with reference to the drawings. They show: Fig. 1 a motor vehicle with an electric axle drive train in a schematic block diagram; Fig. 2 a planetary gear with a stepped planet in a schematic sketch; Fig. 3 a planetary gear in an axial section view; Fig. 4 a housing shell of the gearbox housing in a perspective view; Fig. 5 an enlarged section from Fig. 4 with a sump equipped with an additional guide structure to extend the path of the lubricating medium to a suction opening in a top view of an engine-side housing shell; Fig. 6 an analogous top view of a gearbox-side housing shell; Fig. 7 a similar representation as in Fig. 6 with arrows to illustrate the path of the lubricating medium through the sump to the suction opening, and the Fig. 8 and Fig. 9 two alternative designs of the guiding structure in the swamp.

[0030] The Fig. Figure 1 shows an electrically operated axle drive train 1 in a motor vehicle 2, comprising 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 wet-running planetary gear 5 with an internally toothed ring gear 6, as also found in the Fig. 2 is outlined.

[0031] The planetary gear 5 has a sun gear 24 and several planet gears 22 which engage with the sun gear 24 and are rotatably mounted in a planet carrier 23, which rotate around the sun gear 24, as well as the ring gear 6 arranged coaxially to the sun gear 24, in which the planet gears 22 roll.

[0032] How one can now use the Fig. As can be seen from the overall view of Figure 3, the ring gear 6 is housed in a two-part gearbox housing 7 with a first housing shell 8 and a second housing shell 9, which are designed such that, for the purpose of mounting the planetary gear 5, the ring gear 6 can be inserted into the first housing shell 8 or the second housing shell 9 from an axial direction, which is clearly evident from the overall view of Fig. 3 with the Fig. 4 can be understood.

[0033] The first housing shell 8, formed from a single metal casting, has an annular groove 10 with a radially inner, axially extending surface 11 and a radially outer, axially extending surface 12, wherein the ring gear 6 rests axially against the radially inner surface 12 of the groove 10, and the outer surface 12 has at least one inlet opening 13 for a hydraulic fluid 14 in the upper half of the groove 10 (in the direction of gravity) and at least one outlet opening 15 for the hydraulic fluid 14 in the lower half of the groove 10 (in the direction of gravity). The second housing shell 9 rests against the radially outer surface 12 of the groove 10, so that a cylindrical channel is defined through the groove 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 extending essentially in a radial plane 20.

[0034] The annular groove 10 is formed in one piece, specifically monolithically, with the first housing shell 8. As in the Fig. As shown in Figure 4, a high sump 16 for storing the hydraulic fluid 14 is arranged in the gearbox housing 7. In its upper region (in the direction of gravity), the high sump has an overflow opening 17, which is hydraulically connected to the inlet opening 13. In driving situations, such as during acceleration, braking, or cornering, hydraulic fluid 14, which is located in the high sump 16 of the axle drive train 1, may be conveyed into the gearbox area via the overflow opening 17. To prevent unwanted splashing losses in the planetary gear 5, the hydraulic fluid 14 is not directed uncontrollably into the gearbox interior, but rather guided in a controlled manner via the groove 10 onto a hydraulic path that runs circumferentially past the planetary gear 5. This prevents the interior of the ring gear 6, and thus also of the planetary gear 5, from being affected by this "overflowing" hydraulic fluid 14.This can be clearly seen from the dashed arrows in the . Fig. 4. Follow along, which outline the hydraulic path mentioned.

[0035] The radially inner surface 11 has at least one drain opening 18 in the lower half of the groove 10 (in the direction of gravity) for the hydraulic fluid 14, so that the hydraulic fluid 14 can flow downwards from the inside of the gearbox by gravity. The lower half of the groove 10 (in the direction of gravity) opens into a suction reservoir 19, from which the hydraulic fluid 14 can be pumped back into the sump 16.

[0036] In the Fig. 5 and Fig. In Figure 6, the force of gravity is indicated by an arrow 29. The lower end regions of the gearbox housing shells 8 and 9 define a sump 30 within the gearbox housing. The sump 30 comprises a motor-side cavity 43 and a gearbox-side cavity 44. Fig. Figure 5 shows that the engine-side cavity 43 in the sump 30 is equipped with a guide structure 32.

[0037] The guide structure 32 comprises an upper guide rib 38 and a lower guide rib 48. The upper guide rib 38 extends in line with a sealing web 37, which is attached to the Fig. The sealing rib 37 is formed on the visible inner side of the motor-side housing shell 8. It essentially has the shape of a circular arc and, with the interposition of a sealing device, comes into contact with the gearbox-side housing shell 9 in a sealing manner when the gearbox housing is assembled.

[0038] In Fig. Figure 6 shows a sealing track 40 with the sealing device. The sealing device with the sealing track 40 serves to seal a wet chamber 41 in the gearbox housing. The wet chamber 41 contains hydraulic fluid, which collects in the sump 30 during operation of the axle drive train and is extracted from there via a suction opening 31. The suction opening 31 is, as can be seen in Fig. 5 is located at a lower right end of the sump 30. The suction opening 31 is further enclosed by a circle 28 to clarify its position.

[0039] In Fig. Figure 5 shows that the upper guide rib 38, which is also referred to as upper rib 38 for short, extends from right to left in the direction of a sealing rib 50, extending in such a way that a radial passage opening 39 is formed in Fig. The lower guide rib 48, however, extends from a sealing rib 52 and up to a sealing rib 51. This ensures that the lower guide rib 48 limits a settling volume 49 for the hydraulic fluid in the area of ​​the suction opening 31.

[0040] In Fig. In Figure 6, the guide structure 32 is only indicated by a dashed line. The guide structure 32 can be designed in this way or similarly. In the dashed representation of the guide structure 32, the radial passage opening 39 is missing. The radial passage opening 39 can also be represented by slots or openings in the upper guide rib. Fig. Figure 6 shows that a separating device 42 is arranged in the sump between the two housing shells.

[0041] The separating device 42 is advantageously integrally connected to the sealing device. Accordingly, the separating device 42 is designed, for example, as a solid seal. Circles are defined in Fig. Six axial passage openings 45, 46, 47 are indicated in the separating device 42. The axial passage opening 45 allows hydraulic fluid to pass into the cavity 44. The axial passage opening 47 allows hydraulic fluid to pass to the suction opening. The axial passage openings 45 to 47, which are only indicated, can vary in size, shape, and number.

[0042] In Fig. Figure 7 is indicated by an arrow 33, showing how hydraulic fluid from the wet chamber 41 enters the sump 30 from above. A dashed arrow 34 indicates how the hydraulic fluid is deflected in a labyrinthine manner within the sump 30 before it reaches the suction opening through the axial passage 47.

[0043] In Fig. 7. Air bubbles 35 are indicated by circles, which are advantageously scraped off the indicated lower guide rib 48 in a planing-like manner. In addition, an ellipse in Fig. 7 indicates that an axial passage opening of a different design can also be arranged between the two axial passage openings 45 and 47, which are circular in shape.

[0044] In the Fig. 8 and Fig. Figure 9 shows how the guide structure 32 can be realized in the sump with the help of additional components 55, 56. The components 55, 56 are, for example, made of a plastic material and inserted into the motor-side housing shell 8 to represent the guide structure 32. However, when manufacturing large quantities, the Fig. 5 shown, preferably made of cast metal material, guide structure 32, more cost-effective. List of reference symbols 1 axle drive train 2 motor vehicles 3 electric machine 4 Gear arrangement 5 planetary gears 6. Ring gear 7 Gearbox housing 8 Housing shell 9 Housing shell 10 Nut 11 Surface area 12 Surface area 13 Inlet opening 14 Hydraulic fluid / Lubricant 15 Drain opening 16 High Swamp 17 Overflow opening 18 Drain opening 19 Intake reservoir 20 Radial plane 21 Contact area 22 planetary gear 23 planetary gear carriers 24 sun wheel 28th district 29 Earth's gravity 30 swamp 31 Extraction opening 32 Lead structure 33 Arrow 34 dashed arrow 35 circles 36 axial passage openings 37 Sealing bridge 38 upper guide rib 39 radial passage opening 40 Sealing track 41 Wet room 42 Separating device 43 Cavity 44 Cavity 45 axial passage opening 46 axial passage openings 47 axial passage opening 48 lower guide rib 49 Calming volume 50 sealing strip 51 Sealing bridge 52 sealing bridge 55 Component 56 Component

Claims

[1] Electrically operable axle drive train (1) for a motor vehicle (2), comprising an electric machine (3) which is drivingly connected to a wet-running transmission arrangement (4) which is arranged in a transmission housing (7) which comprises a sump (30) arranged at the bottom with respect to a line of action of a gravitational force (29), in which sump a hydraulic fluid (14) collects during operation of the axle drive train (1) and is sucked out of the sump (30) via a suction opening (31), wherein a guide structure (32) is provided upstream of the suction opening (31) in the sump (30), with the aid of which a path of the hydraulic fluid (14) in the sump (30) to the suction opening (31) is significantly extended, wherein the guide structure (32) has an upper guide rib (38) relative to the line of action of the earth's gravity (29), which shields the sump (30) upwards in a roof-like manner, but without completely closing the sump (30) upwards, wherein a radial passage opening (39) remains free in the direction of the sump, wherein the gear housing (7) comprises a motor-side and a gear-side housing shell (8, 9), wherein a sealing device is arranged between the two housing shells (8, 9), which seals off a wet space (41) characterized by that a separating device (42) is arranged between the two housing shells (8,9), which divides the sump (30) in a parting plane between the housing shells (8.9) into two cavities (43,44) in such a way that the hydraulic fluid (14) in the sump (30) is deflected in a labyrinth-like three-dimensional manner on the way to the suction opening (31). [2] Electrically operable axle drive train (1) for a motor vehicle (2), comprising an electric machine (3) which is drivingly connected to a wet-running transmission arrangement (4) which is arranged in a transmission housing (7) which comprises a sump (30) arranged at the bottom with respect to a line of action of a gravitational force (29), in which sump a hydraulic fluid (14) collects during operation of the axle drive train (1) and is sucked out of the sump (30) via a suction opening (31), wherein a guide structure (32) is provided upstream of the suction opening (31) in the sump (30), with the aid of which a path of the hydraulic fluid (14) in the sump (30) to the suction opening (31) is significantly extended, wherein the guide structure (32) has an upper guide rib (38) relative to the line of action of the earth's gravity (29), which shields the sump (30) upwards in a roof-like manner, but without completely closing the sump (30) upwards, wherein a radial passage opening (39) remains free in the direction of the sump, characterized by that the upper rib (38) extends in extension of a circular arc-shaped sealing track (40) which is provided on a ring gear (6) integrated into the transmission-side housing shell (9). [3] Electrically operable axle drive train according to claim 1 or 2, characterized by that the separating device (42) comprises at least one axial passage opening (36,45,46) which is arranged in the sump (30) below the radial passage opening (36,35,46) with respect to the line of action of the earth's gravity (29). [4] Electrically operable axle drive train according to one of claims 1 to 3, characterized bythat the separating device (42) comprises at least one axial passage opening (47) which is arranged in the sump (30) in at least partial overlap with the suction opening (31) in the sump (30). [5] Electrically operable axle drive train according to one of claims 1 to 4, characterized by in that the guide structure (32) has a lower guide rib (48) with respect to the line of action of the earth's gravity (29), which delimits a calming volume (49) in the sump (30) in front of the suction opening (31) for the hydraulic fluid (14). [6] Electrically operable axle drive train according to one of claims 1 to 5, characterized by that the upper guide rib (48) is at least one third longer than the lower guide rib (38) in a circumferential direction. [7] Gearbox housing (7), in particular gearbox-side or engine-side housing shell (8,9), sealing device and / or separating device (42) for an electric axle drive train (1) according to one of the preceding claims.

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