WO2022089839A1

WO2022089839A1 - Gearbox for a drive device of a motor vehicle and corresponding drive device

Info

Publication number: WO2022089839A1
Application number: PCT/EP2021/075846
Authority: WO
Inventors: Christian Holzapfel
Original assignee: Audi Ag
Priority date: 2020-10-28
Filing date: 2021-09-21
Publication date: 2022-05-05
Also published as: DE102020128320B3

Abstract

The invention relates to a gearbox (4) for a drive device (1) of a motor vehicle, comprising at least two drivingly interconnected shafts (9, 10) which are rotatably mounted in an interior (6) of a gearbox housing (5) of the gearbox (4). According to the invention, the ends of the shafts (9, 10) pass through a housing wall (7) of the gearbox housing (5), which housing wall defines the interior (6), and a housing cover (16) secured to the housing wall (7) extends over the ends of the shafts. The interior (6) is fluidically connected via an overflow opening (23) formed in the housing wall (7) to an overflow chamber (22) located between the housing wall (7) and the housing cover (16). A ventilation opening (14) is formed in the housing cover (16) at a distance from the overflow opening (23). The invention also relates to a drive device (1) for a motor vehicle.

Description

Transmission for a drive device

Motor vehicle and corresponding drive device

DESCRIPTION:

The invention relates to a transmission for a drive device of a motor vehicle, having at least two shafts which are connected to one another in terms of drive technology and are rotatably mounted in an interior space of a transmission housing of the transmission. The invention also relates to a drive device for a motor vehicle.

The publication DE 10 2015 002 320 A1, for example, is known from the prior art. This describes a ventilation device for a transmission housing, at least comprising a valve device and a ventilation chimney, wherein the valve device can be arranged essentially outside the transmission housing and the ventilation chimney can be extended essentially inside the transmission housing.

Furthermore, the publication DE 10 2015 217 112 A1 discloses a ventilation for a transmission, which is suitable for use with a motor vehicle, with a base body through which a ventilation channel extends, with a first oil-impermeable but air-permeable membrane and with a second water-impermeable but air-permeable membrane Membrane, wherein a channel interior is delimited by a circumferential channel wall of this ventilation channel and by these two membranes, which is closed off by the second membrane and the channel wall in a water-tight manner, the surface of the second membrane facing away from the channel interior being fluidly connected to the environment surrounding the ventilation for gas exchange is. It is provided that the first Membrane and the channel wall seal off this channel interior in an oil-tight manner.

It is the object of the invention to propose a transmission for a drive device of a motor vehicle which has advantages over known transmissions, in particular a particularly reliable lubricant separation during venting of the transmission housing.

According to the invention, this is achieved with a transmission for a drive device of a motor vehicle with the features of claim 1 . It is provided that the ends of the shafts pass through a housing wall of the transmission housing that delimits the interior space and are overlapped by a housing cover fastened to the housing wall, with the interior space being fluidically connected to an overflow space between the housing wall and the housing cover via an overflow opening formed in the housing wall and a ventilation opening is formed in the housing cover at a distance from the overflow opening.

Advantageous configurations with expedient developments of the invention are specified in the dependent claims.

The transmission preferably forms part of the drive device, but can of course also be present independently of the drive device. The transmission is used for speed and/or torque transmission between an input shaft and an output shaft of the transmission. If the drive device is assigned to the motor vehicle or forms part of it, the transmission is preferably arranged in terms of drive technology between a drive unit of the drive device and at least one wheel axle of the motor vehicle.

For this purpose, the drive unit is preferably connected in terms of drive technology to the input shaft of the transmission, preferably rigidly and/or per- manent. The output shaft, on the other hand, is drivingly connected to the at least one wheel axle, for example via a further gear or a plurality of further gears. The additional gear is preferably in the form of an axle differential gear or a center differential gear. For example, the transmission is connected directly to the axle differential transmission, in particular rigidly and/or permanently.

However, it can also be provided that the transmission is only indirectly connected to the axle differential transmission in terms of drive technology, preferably via the center differential transmission. In the latter case, the drive assembly is connected in drive terms to the center differential gear via the gear and the gear to the axle differential gear via the center differential gear. The transmission preferably comprises at least one gear stage, for example it is in the form of a non-shiftable transmission which has only a single translation.

The gearbox has the shafts, which are connected to one another in terms of drive technology. For example, the shafts are drivingly coupled to one another via a gear stage, preferably rigidly and/or permanently. In this case, a first gear of the gear transmission stage is arranged on a first of the shafts and a second gear of the gear transmission stage is arranged on a second of the shafts and is coupled to it in a torque-proof manner. The gear transmission stage has a specific transmission ratio, which is preferably different from 1.

Furthermore, the transmission has the transmission housing, in which an inner space is formed. In the interior, the shafts are at least partially arranged and rotatably mounted. The interior is limited by the housing wall. This means that the housing wall is present between the interior and an external environment of the transmission. The housing wall is formed, for example, by a plurality of housing shells which are attached to one another. For example, the housing shells collide in an imaginary parting plane and are attached to one another. The shafts, which are rotatably mounted in the interior, reach through the housing wall with their walls, that is to say they are each only partially arranged in the interior. Provision can be made for the shafts to only engage in the housing wall, that is to say only partially pass through it. Alternatively, it can be provided that the corrugations reach through the housing wall completely and end flush with an outside of the housing wall facing the outside environment. However, it can also be provided that the corrugations protrude beyond the housing wall on the side of the housing wall facing away from the interior, ie protrude from the housing wall there.

The configuration of the transmission described above makes it possible to achieve, in particular, a reliable bearing arrangement for the shafts that is structurally simple to implement. The housing cover is arranged on the side of the housing wall facing the outside environment or on the side of the housing wall facing away from the interior. This overlaps the shafts or their ends, so that the shafts are not accessible from the outside environment. This protects the shafts from external influences from the outside environment. It also prevents lubricant from escaping from the shaft ends to the outside environment.

In addition, the housing cover is used to ventilate the gearbox housing. Between the housing cover and the housing wall is the overflow space, which is fluidically connected to the interior, namely via the overflow opening. There is a preferably permanent flow connection between the interior space and the overflow space via the overflow opening.

Furthermore, the overflow space is fluidically connected to the outside environment, namely via the ventilation opening. The ventilation opening is formed in the housing cover, specifically at a distance from the overflow opening. This is to be understood in particular as meaning that the ventilation opening is spaced apart from an imaginary extension of the flow opening is arranged. In other words, the ventilation opening is arranged at a distance from a surface normal of an inlet opening, via which the overflow opening flows into the overflow space in terms of flow.

Fluid entering the overflow chamber from the interior through the overflow opening is thus deflected at least once, preferably several times, before it can pass through the ventilation opening from the overflow chamber into the outside environment or at least flow in the direction of the outside environment. A flow labyrinth is formed with the aid of the housing cover. The configuration of the transmission described ensures reliable separation of a lubricant from the fluid emerging from the interior. The fluid is preferably in the form of air.

The lubricant is, for example, at least temporarily introduced into the interior of the transmission housing, in particular during operation of the transmission. The at least intermittent rotary movement of the shafts causes the lubricant to be distributed, in particular the lubricant is divided into small droplets. These are carried along by the fluid when the gear housing is vented and conveyed in the direction of the vent opening.

With conventional transmission housings, considerable effort is required to prevent the lubricant from escaping into the external environment. This does not apply to the transmission described, since the fluid is deflected one or more times on its flow path from the interior space to the ventilation opening. Due to the deflection, the lubricant is separated from the fluid and can get back into the interior. Thus, the lubricant is reliably separated from the fluid with little design effort.

A further development of the invention provides that, adjacent to the housing cover, there is one which is drivingly connected to at least one of the shafts another shaft of the gearbox penetrates the housing wall. The further shaft is also preferably rotatably mounted on the housing wall. For example, the additional shaft passes through the housing wall on the same side as the two shafts. The further shaft is preferably arranged parallel to at least one of the shafts or to both shafts. The shafts are therefore particularly preferably arranged parallel to one another and to the further shaft.

The other shaft passes through the housing wall away from the housing cover, so that it is not overlapped by the housing cover. Correspondingly, the further shaft is accessible from the outside environment. For example, the other shaft serves as the output shaft of the transmission. At least one further shaft, for example a cardan shaft or the like, is connected in terms of drive technology to the output shaft. The transmission described has the advantage of a simple structural design. An embodiment is particularly preferred in which the further shaft reaches through the transmission housing on opposite sides or protrudes from it. In this case, on opposite sides of the other shaft, one shaft is connected to it in terms of drive technology. As explained, these shafts can be in the form of articulated shafts. They serve to connect at least one wheel of the motor vehicle to the other shaft in terms of the drive system.

A development of the invention provides that the housing wall has an opening for each of the shafts, in which the respective shaft is rotatably mounted by means of a bearing. The ends of the shafts engage in the openings in which the bearings are also arranged. The shafts are rotatably mounted directly on the housing wall via the bearings. This has the advantage of an extremely stable and reliable bearing of the shafts.

A development of the invention provides that the bearing has a cover disk on its side facing the housing cover. The bearings are particularly preferably designed as roller bearings, ie have several rolling elements. In order to avoid turbulence of the lubricant or the fluid present in the overflow chamber, the bearings are provided with cover disks. The cover disks are covers that cover the rolling bodies of the bearings in the direction of the transfer chamber. As a result, the flow of the fluid and the lubricant in the overflow chamber is calmed down.

A development of the invention provides that the overflow opening has a flow cross-sectional area that is smaller than the cross-sectional area of the openings. The flow cross-sectional area of the overflow opening is selected such that it enables reliable venting of the housing and at least partially prevents the lubricant from being discharged from the interior in the direction of the overflow space. At the same time, of course, a return flow of lubricant already present in the overflow space into the interior should be made possible or carried out.

For these reasons, the flow cross-sectional area of the overflow opening is small in comparison with the cross-sectional areas of the openings. The flow cross-sectional area of the overflow opening is particularly preferably at most 10%, at most 5%, at most 2.5% or at most 1% of the cross-sectional area of the openings or one of the openings. As a result, a large part of the lubricant present in the fluid is retained in the interior and does not get into the overflow space. Conversely, a backflow of the lubricant from the overflow space into the interior is made possible and promoted.

Additionally or alternatively, the flow cross-sectional area of the overflow opening based on a volume of the transmission housing, in particular the volume of only one of the housing shells, preferably that of the housing shells in which the openings are arranged, is at most 10 mm ² /l, at most 7.5 mm ² /l or at most 5 mm ² /l. in other In other words, the ratio between the flow cross-sectional area of the overflow opening and the volume of the transmission housing is considered. The combined volume of both housing shells can be used as the volume of the transmission housing. However, the volume is particularly advantageously the volume of only one of the housing shells, namely the housing shell spaced apart from the drive unit or its machine housing. Such a restriction ensures that, although sufficient venting is always possible, some of the lubricant is held back by the overflow opening.

Conversely, it can preferably be provided that the flow cross-sectional area of the overflow opening is at least 0.25%, at least 0.5%, at least 0.75% or at most 1% of the cross-sectional area of the openings. Additionally or alternatively, the flow cross-sectional area of the overflow opening is at least 1 mm ² /l, at least 2.5 mm ² /l or at least 5 mm ² /l, based on the volume of the transmission housing.

A further development of the invention provides that the overflow opening is arranged between the openings when viewed in section. This is to be understood in particular as meaning that the overflow opening is located between two straight lines which, on the one hand, are spaced apart from one another and tangentially on a first of the openings and on the other hand tangentially on a second of the openings. This results in a particularly space-saving arrangement and a small size of the housing cover.

A further development of the invention provides that the ventilation opening and the overflow opening are arranged on opposite sides of an imaginary plane which accommodates an axis of rotation of one of the shafts and is perpendicular to a plane which accommodates the axes of rotation of both shafts. In order to achieve sufficient efficiency in the separation of the lubricant from the fluid, a correspondingly large distance is realized between the ventilation opening and the overflow opening. For this lie the Vent opening and overflow opening on opposite sides of the imaginary plane.

On the one hand, this imaginary plane accommodates the axis of rotation of one of the shafts. On the other hand, it stands vertically on another level, which accommodates the axes of rotation of both shafts. The axis of rotation, which takes up the imaginary plane, is preferably the axis of rotation of that of the shafts which is geodetically higher than the respective other of the shafts when the transmission is arranged as intended. In addition, it is preferably provided that the overflow opening is arranged geodetically below the ventilation opening when the transmission is arranged as intended. This ensures that the fluid must flow geodetically upwards with the lubricant it carries with it. As a result, the separation efficiency of separating the lubricant from the fluid is increased.

A further development of the invention provides that a web extends from the housing cover and extends through the overflow chamber and rests against the housing wall, the web delimiting at least one connection opening via which the overflow opening is fluidically connected to the ventilation opening. The web extends from the housing cover to the housing wall. Accordingly, it reaches through the overflow space and divides it into several sub-spaces. The partial spaces are fluidically connected to one another via the at least one connection opening.

The overflow opening opens into one of the partial spaces and the ventilation opening into another of the partial spaces. Correspondingly, the fluid entering the overflow space from the interior via the overflow opening must flow through the connection opening in order to get from one part space up into the other part. This achieves a high separation efficiency, since the lubricant is at least partially retained as it flows through the connection opening. A further development of the invention provides that the web is configured convexly in the direction of the overflow opening when viewed in section. To this extent, the web has a curvature which is preferably constant over the direction of its greatest extension. For example, seen in section, the web is part-circular. A center point of the reference circle corresponds, for example, to the axis of rotation of one of the shafts. In any case, the web is curved in such a way that over its course it approaches the overflow opening and moves away from it on both sides of the overflow opening. Seen over its longitudinal extent, the web thus initially runs towards the overflow opening and then moves away from it again. As a result, low-loss flow guidance is realized within the housing cover.

A further development of the invention provides that the web delimits the ventilation opening together with an edge of the housing cover that lies tightly against the housing wall. After the housing cover has been dismantled, the edge lies tightly against the housing wall continuously and uninterruptedly. To this extent, the edge can include a seal which is, for example, a component of the housing cover. The edge preferably lies in an imaginary plane, in particular continuously. The web particularly preferably extends from the housing cover to this imaginary plane.

At least its connection opening is now between the web and the rim. For example, the web ends at a distance from the edge to form the connection opening. For example, the connection opening is delimited in one direction on opposite sides by the web and the edge and in another direction by the housing wall and the housing cover and/or the web. The two directions mentioned are particularly preferably perpendicular to one another.

It can be provided that there are several ventilation openings, namely on opposite sides of the web. To this extent, the ventilation openings are designed to be spaced apart from one another and each rest on opposite sides of the bridge. Each of the connection openings is delimited on the one hand by the web and on the other hand by the edge. This means that efficient venting is implemented with a high separation performance at the same time.

A development of the invention provides that the connection opening has a flow cross-sectional area that is smaller than the flow cross-sectional area of the overflow opening. In particular, the through-flow cross-sectional area of all connection openings together is smaller than the through-flow cross-sectional area of the overflow opening. This achieves a particularly high separation efficiency.

A development of the invention provides that a first of the shafts is an input shaft, a second of the shafts is an intermediate shaft and the further shaft is an output shaft of the transmission. The different waves have already been discussed above. For example, a drive assembly of the drive device is drive-connected to the transmission via the input shaft, and a wheel axle of the motor vehicle is connected to the output shaft. The input shaft and the output shaft are drive-connected to one another via the intermediate shaft. Preferably, there is a first gear stage between the input shaft and the intermediate shaft and a second gear stage between the intermediate shaft and the output shaft. Each gear stage has two meshing gears. A desired transmission ratio between the output shaft and the input shaft is realized with the aid of the gear transmission stages. The transmission ratio is preferably different from one.

The invention also relates to a drive device for a motor vehicle, with a transmission, in particular a transmission according to the statements in the context of this description, which has at least two drive-connected shafts which are rotatably mounted in an interior of a transmission housing of the transmission. It is provided that the ends of the shafts have a housing that delimits the interior sew wall of the transmission housing and are overlapped by a housing cover fastened to the housing wall, the interior being fluidically connected via an overflow opening formed in the housing wall to an overflow space present between the housing wall and the housing cover, and a ventilation opening being formed in the housing cover at a distance from the overflow opening .

The advantages of such a configuration of the transmission or the drive device have already been pointed out. Both the drive device and the transmission can be further developed according to the explanations within the scope of this description, so that reference is made to them in this respect.

A further development of the invention provides that a machine housing of a drive unit is attached to the transmission housing, with a motor shaft of the drive unit being connected in terms of drive technology to at least one of the shafts. The drive unit is, for example, an electrical machine or the like. In any case, the drive unit or its machine housing is attached to the transmission housing, in particular it is in contact with it. The transmission housing and the machine housing are particularly preferably rigidly attached to one another. The motor shaft of the drive unit is drivingly connected to one of the shafts, preferably to the input shaft. The drive unit is preferably located on the side of the housing wall opposite the housing cover. In other words, the transmission housing is arranged between the drive unit and the housing cover. This achieves a compact configuration of the drive device.

A development of the invention provides that one of the shafts extends through the housing wall on the side opposite the housing cover and is coupled there in terms of drive technology to the motor shaft. Passing through the housing wall through the shaft enables coupling to the drive unit in a simple manner. The wave is preferably the drive shaft, so that it particularly preferably penetrates the housing wall on both sides. The shaft or the drive shaft thus engages with a first end as well as with a second end in the housing wall and is particularly preferably mounted there, in particular by means of a bearing, for example a roller bearing.

The features and feature combinations described in the description, in particular the features and feature combinations described in the following description of the figures and/or shown in the figures, can be used not only in the combination specified in each case, but also in other combinations or on their own, without going beyond the scope of the leave invention. The invention is therefore also to be regarded as encompassing embodiments which are not explicitly shown or explained in the description and/or the figures, but emerge from the explained embodiments or can be derived from them.

The invention is explained in more detail below with reference to the exemplary embodiments illustrated in the drawing, without the invention being restricted. It shows:

Figure 1 shows a schematic representation of a drive device for a motor vehicle, which has a transmission with a transmission housing and a housing cover fastened to the transmission housing,

Figure 2 is a further schematic representation of the drive device without the gear cover, and

FIG. 3 shows a schematic detailed view of the housing cover.

FIG. 1 shows a schematic representation of a drive device 1 for a motor vehicle. The drive device 1 has a drive unit 2 with a machine housing 3 and a gear 4 with a gear housing 5. The gear housing 5 includes a not covered here recognizable interior 6 with a housing wall 7 a. The housing wall 7 is formed, for example, by a plurality of housing shells 8 which are fastened tightly to one another. It can be provided that the housing shell 8 facing the drive unit 2 is merely a type of “intermediate housing” and the essential elements of the transmission 4 are arranged in the housing shell 8 facing away from the drive unit 2 .

The transmission housing 5 accommodates a plurality of shafts, namely at least two shafts 9 and 10 (not visible here) and a further shaft 11, each at least in certain areas. The shaft 10 is designed as an input shaft, the shaft 9 as an intermediate shaft and the further shaft 11 as an output shaft. The input shaft 10 is preferably directly drivingly coupled to a motor shaft of the drive assembly 2, which is preferably present as an electric machine. The other shaft 11 projects out of the machine housing 3 on the side of the machine housing 3 facing away from the drive unit 2 in order to be coupled to another shaft, for example.

Additionally or alternatively, the further shaft 11 projects out of the machine housing 3 on the side of the machine housing 3 facing the drive unit 2 . This serves in particular for coupling to yet another wave. Finally, the further shaft 11 is intended and equipped to be coupled to a wheel axle of a motor vehicle. For example, a first wheel is connected to a first side of the additional shaft 11 and a second wheel to a second side of the additional shaft 11, i.e. on opposite sides of the machine housing 3.

It can also be seen that motor mounts 12 are configured on the transmission housing 5, via which the drive device 1 is attached to a motor vehicle or to a body of the motor vehicle. An electronics housing 13, in which power electronics of the drive unit 2 is preferably arranged, is preferably both on the machine housing 3 and on the gear housing 5, but in particular only on one of the housing shells 8, preferably only that of the machine housing 8 facing housing shell 8, be attached. To ventilate the transmission housing 5 or the interior 6 , the transmission 4 has a ventilation opening 14 . This is part of a ventilation connection 15 and is formed in a housing cover 16 which is fastened to the housing wall 7 . A connecting piece 17 , for example, is pressed into the ventilation opening 14 .

FIG. 2 shows a further schematic illustration of the drive device 1 with the housing cover 16 removed. It can be seen that the shafts 9 and 10 reach through the housing wall 7 at least partially or even completely. For this purpose, 5 openings 18 and 19 are formed in the transmission housing, in which the shafts 9 and 10 are rotatably mounted. Bearings, in particular roller bearings, are preferably provided for mounting the shafts 9 and 10 in the openings 18 and 19 . These are each provided with a cover disk 20 and 21, respectively. The housing wall 7 delimits an overflow space 22 with the housing cover. This is fluidically connected to the interior space 6 via an overflow opening 23 . The overflow opening 23 is preferably arranged between the two openings 18 and 19 . Its flow cross-sectional area is smaller than a cross-sectional area of each of the openings 18 and 19. The overflow opening 23 is located geodetically below the ventilation opening 14 when the transmission 4 or the drive device 1 is arranged as intended.

FIG. 3 shows a schematic detailed representation of the housing cover 16. This has a continuous edge 24 which, after the housing cover 16 has been fastened to the housing wall 7, bears continuously and sealingly against the latter. A web 25 extends from the housing cover 16 in the direction of the housing wall 7 . In particular, the web 25 extends at least as far as an imaginary plane, which accommodates the edge 24 in a continuous and uninterrupted manner. The web 25 is curved in the direction of the overflow opening 23 . Here, with respect to the overflow opening 23 is designed convex. The web 25 delimits at least one connection opening 26, in the exemplary embodiment shown here several connection openings 26. After the assembly of the housing cover 16 on the transmission housing 5 or housing wall 7, the connection opening 26 or each connection opening 26 is separated from the web 25, the edge 24 and the Housing wall 7 limited.

The connecting openings 26 are formed at the end of the web 25, in the starting example shown here on opposite sides of the web 25. The connecting openings 26 each have a flow cross-sectional area which is smaller than the cross-sectional area of the overflow opening 23. It is also smaller than the flow cross-sectional area of the ventilation opening 14. For example, the flow cross-sectional area of the connection opening 26 is at most 20%, at most 15%, at most 10% or at most 5% of the flow cross-sectional area of the overflow opening 23 or the ventilation opening 14. This creates a labyrinth separator. This labyrinth separator ensures that a lubricant is separated from a fluid which flows from the interior 6 through the overflow opening 23 into the overflow space 22 and flows through it in the direction of the ventilation opening 14 . A vent line can be fluidically connected to the vent opening 14 via the connection 17 .

With the described configuration of the drive device 1 or the transmission 4, a reliable venting of the transmission housing 5 and an effective separation of lubricant from a fluid discharged from the interior 6 in the course of venting is realized. LIST OF REFERENCE NUMBERS: Drive device Drive unit Machine housing Gearbox Gearbox housing Interior Housing wall Housing shell Shaft Shaft Shaft Motor bearing Electronics housing Ventilation opening Ventilation connection Housing cover Connection piece Breakthrough Breakthrough Cover plate Cover plate Overflow space Overflow opening Edge web Connection opening

Claims

PATENT CLAIMS:

1. Transmission (4) for a drive device (1) of a motor vehicle, with at least two shafts (9, 10) which are connected to one another in terms of drive technology and which are rotatably mounted in an interior (6) of a transmission housing (5) of the transmission (4), characterized in that characterized in that ends of the shafts (9, 10) reach through a housing wall (7) of the gear housing (5) delimiting the interior (6) and are overlapped by a housing cover (16) fastened to the housing wall (7), the interior (6 ) is fluidically connected via an overflow opening (23) formed in the housing wall (7) to an overflow space (22) between the housing wall (7) and the housing cover (16) and spaced from the overflow opening (23) by a ventilation opening (14). the housing cover (16) is formed.

2. Transmission according to claim 1, characterized in that adjacent to the housing cover (16) with at least one of the shafts (9, 10) drivingly connected further shaft (11) of the transmission (4) passes through the housing wall (7).

3. Transmission according to one of the preceding claims, characterized in that the housing wall (7) for each of the shafts (9, 10) has an opening (18, 19) in which the respective shaft (9, 10) can be rotated by means of a bearing is stored.

4. Transmission according to one of the preceding claims, characterized in that the overflow opening (23) has a flow cross-sectional area which is smaller than the flow cross-sectional area of the openings (18, 19).

5. Transmission according to one of the preceding claims, characterized in that the overflow opening (23) seen in section between the openings (18, 19) is arranged.

6. Transmission according to one of the preceding claims, characterized in that a web (25) extends from the housing cover (16), which extends through the overflow chamber (22) and rests against the housing wall (7), the web (25) having at least one Connection opening (26) limited, via which the overflow opening (23) with the vent opening (14) is fluidically connected.

7. Transmission according to one of the preceding claims, characterized in that the web (25) delimits the ventilation opening (14) together with an edge (24) of the housing cover (16) lying tightly against the housing wall (7).

8. Transmission according to one of the preceding claims, characterized in that a first of the shafts (9, 10) is an input shaft, a second of the shafts (9, 10) is an intermediate shaft and the further shaft (11) is an output shaft of the transmission (4) is.

9. Drive device (1) for a motor vehicle, with a transmission (4), in particular a transmission (4) according to one or more of the preceding claims, which has at least two drivingly connected shafts (9, 10) in an interior (6) of a gear housing (5) of the gear (4), characterized in that ends of the shafts (9, 10) reach through a housing wall (7) of the gear housing (5) delimiting the interior (6) and from a The housing cover (16) attached to the housing wall (7) overlaps, the interior (6) having an overflow opening (23) formed in the housing wall (7) with an overflow space (22 ) is fluidically connected and spaced from the overflow opening (23) a vent opening (14) is formed in the housing cover (16).

10. Drive device according to claim 9, characterized in that on the gear housing (5) a machine housing (3) of a drive unit (2) is attached, wherein a motor shaft of the drive unit gats (2) is drivingly connected to at least one of the shafts (9,10).

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