WO2018114024A1

WO2018114024A1 - Motor-vehicle transmission apparatus

Info

Publication number: WO2018114024A1
Application number: PCT/EP2017/001252
Authority: WO
Inventors: Tobias Schilder; Klaus Riedl
Original assignee: Daimler Ag
Priority date: 2016-12-21
Filing date: 2017-10-25
Publication date: 2018-06-28
Also published as: DE102016015183A1

Abstract

The invention relates to a motor-vehicle transmission apparatus, having at least one transmission (11) for providing a gear ratio, which transmission has at least one ring gear (12), and having at least one final drive (13) coupled to the output side of the transmission (11), wherein the at least one ring gear (12) of the transmission (11) has external teeth, by means of which the ring gear (12) is coupled to the final drive (13).

Description

Motor vehicle transmission device

The invention relates to a motor vehicle transmission device and a drive train with the motor vehicle transmission device.

From DE 10 2014 006 145 A1 a motor vehicle transmission device is already known with at least one transmission to provide a translation, which has at least one ring gear, and with at least one output side coupled to the transmission axle drive. Especially with a transverse installation of a

Automotive gear device must be represented by a crankshaft on the side shaft axis offset. In manual transmissions and dual clutch transmissions this misalignment is usually solved so that one translates from a main shaft to the countershafts and then a final drive directly on a

Side shaft axis ends. In planetary gearboxes in transverse design, the axial offset always takes place with one to two spur gear stages on the output, since the planetary gearbox builds coaxially. This usually results in a principle-related disadvantage with respect to an axial length. The axial space will be significantly reduced in future vehicle series by the addition of other components such as electric motors. Space saving

Motor vehicle transmission devices are required for this purpose.

From the generic DE 10 2004 033 396 A1 discloses a drive train with a drive unit and with a motor vehicle transmission device is known, wherein the motor vehicle transmission device comprises a transmission which has at least one ring gear and a driven side coupled to the transmission axle drive,

wherein the at least one ring gear of the transmission is arranged in the axial direction on an end of the transmission facing the drive unit,

and wherein the at least one ring gear of the transmission has an external toothing, which meshes directly with a toothing of the transaxle. The invention is in particular the object of providing a performant and axially compact drive train. It is achieved by an embodiment according to the invention according to claim 1. Further developments of the invention will become apparent from the dependent claims.

The invention relates to a drive train with a

Motor vehicle transmission device with at least one transmission, which has at least one ring gear, and with at least one output side coupled to the transmission axle drive.

It is further assumed that the at least one ring gear of the transmission has an external toothing, via which the ring gear is coupled to the axle drive. Preferably, the at least one ring gear of the transmission via the external teeth is permanently coupled to the axle drive. Preferably, the transmission is in particular formed by a mechanical transmission gear. The transmission is particularly intended to provide a translation of a speed. As a result, in particular an advantageously compact, in particular axially compact,

Motor vehicle transmission device can be provided. Preferably, in particular, a motor vehicle transmission device can be provided, in which an axial offset between the transmission and the axle drive and / or between a drive unit and the axle drive takes place directly. In particular, a number of components can be kept small. Preferably can be dispensed with a driven side spur gear of the transmission. Furthermore, a rotating mass can thereby be kept low. This can / CO 2 savings and / or advantageous fast circuit speeds can be achieved. Under one

"Motor vehicle transmission device" is to be understood in this context, in particular a device of a motor vehicle, which is intended to transmit a drive movement of a drive unit of the motor vehicle, in particular an engine, for example an internal combustion engine, to drive wheels of the motor vehicle. Particularly preferably, the drive unit has an electric motor with a rotor and a stator. In addition, in this context, a "ring gear" should be understood to mean, in particular, an annular toothed wheel with internal toothing, particularly preferably a radially outer toothed wheel ring of a planetary gear set and / or a planetary gear set Furthermore, in this context, a "axle drive" is to be understood as meaning, in particular, a transmission of a motor vehicle, which is intended to provide a force of a motor vehicle Drive unit of the motor vehicle to be transmitted to the axis of the drive wheels of the motor vehicle. Preferably, the axle gear is provided to transmit a force from the transmission to the shaft of the drive wheels of the motor vehicle. In this context, "external toothing" is to be understood as meaning, in particular, a toothing which extends along an outer circumference, preferably a toothing which is arranged on a radially outer surface of the ring gear By "provided" is meant in particular specially designed and / or equipped understood. The fact that an object is intended for a specific function should in particular mean that the object fulfills and / or executes this specific function in at least one application and / or operating state.

Furthermore, it is assumed that the external toothing of the ring gear meshes directly with a toothing of the transaxle. Preferably, the external teeth of the ring gear meshes directly with a drive wheel of the axle drive, such as a ring gear and / or a spur gear of the transaxle. As a result, an advantageously reliable and compact coupling of the transmission with the axle drive can be achieved. In particular, additional transmission elements between the axle drive and the transmission can be dispensed with. It can be an advantageously compact design

Motor vehicle transmission device can be achieved.

According to the invention it is proposed that the transmission is designed to provide at least two shiftable ratios and that the axle drive is arranged radially outside the ring gear.

For this purpose, the external toothing of the at least one ring gear is arranged radially outside the internal toothing of the at least one ring gear.

In this way, in comparison to the prior art, a particularly compact and at the same time high-performance drive train is shown.

Furthermore, it is proposed that the at least one ring gear of the transmission is arranged coaxially with respect to a drive shaft of a drive unit driving the transmission. Preferably, the transmission is arranged at least substantially coaxially with the drive shaft of the drive unit. As a result, it is possible in particular to dispense with multiple axle offsets. In particular, an advantageously compact construction can be achieved. Under a "drive unit" should in this context

in particular an engine of the motor vehicle, in particular an electric motor, or also for example an internal combustion engine, to be understood. Particularly preferred is a ring gear of the transmission coaxial with a rotor as an electric motor

arranged drive unit arranged.

Furthermore, it is proposed that the at least one ring gear of the transmission and the drive wheel of the transaxle are arranged in a common wheel plane. With the arrangement in the common wheel plane is meant that an internal toothing of the at least one ring gear is arranged axially at the same height with an external toothing of the at least one ring gear and also axially at the same height with a toothing of the drive wheel of the transaxle.

It is further proposed that the at least one transmission is at least partially formed by a planetary gear. Preferably, this is to be understood in particular as meaning that the transmission comprises at least one planetary gear set. However, the transmission does not necessarily have to be a pure planetary gear, but can

basically also contain further, translation-forming elements. As a result, in particular an advantageously compact transmission can be provided.

Preferably, the ring gear is associated with a drive side first planetary gear set. The ring gear is particularly preferably associated with a planetary gear, which is the drive unit of the motor vehicle closest. This can be achieved in particular that the axle drive is advantageously arranged close to the drive unit. This in turn can be achieved that the drive unit can be advantageously arranged centrally. This is particularly advantageous in a motor vehicle with front-transverse transmission, so with transverse mounting and front-wheel drive. Under a

"Planetary gearset" should be understood to mean, in particular, a unit having a sun gear, a ring gear and at least one planet gear guided by a planet carrier on a circular path around the sun gear.

Preferably, in particular, a transmission can be provided with an axially small overall length. In particular, a transmission with a ring gear can be provided. A "planetary gear" should in particular be understood to mean a gear which has at least one planetary gear connected to a planet carrier, which is coupled in the radial direction outwards with a ring gear and in the radial direction inwards with a sun gear. Particularly preferably, the transmission has exactly two planetary gear sets, the first planetary gear set having at least one ring gear, exactly one sun gear and exactly one planet carrier, and wherein a second planetary gearset of exactly two planetary gear sets has a second sun gear, a second planet carrier and a second ring gear.

Particularly preferred is the drive shaft rotatably coupled to the sun of the transmission. In this case, the drive unit particularly preferably has an electric motor which has a rotor which is coupled to the drive shaft. In this way, a very compact and suitable for a transverse installation in a vehicle powertrain can be displayed.

It is also proposed that the motor vehicle transmission device has a housing which forms an oil chamber and is provided to receive the at least one transmission and the at least one axle drive. Preferably, the transmission and the axle drive in a common housing and a

arranged common oil room. As a result, in particular an advantageously compact arrangement can be provided. Furthermore, a number of components can be kept low. Preferably, in particular, a reliable lubrication of a connection between the at least one transmission and the axle drive can be achieved in particular. A "housing" is to be understood in this context in particular a structural unit, which is provided for receiving and protecting the at least one transmission and the at least one axle drive.

Preferably, the housing surrounds the at least one gear and the at least one axle drive. Preferably, the housing can be formed in one piece as well as in several parts. Particularly preferably, the housing is at least rotationally fixed relative to a body of the motor vehicle, in particular stationary. In this context, an "oil space" is to be understood as meaning, in particular, a space which, at least in one operation, is at least partially filled with oil, preferably with gear oil.

Furthermore, particularly preferred, the transmission with the exactly two

Planetary gear sets exactly two switching elements. By a switching element is meant an element for coupling two transmission elements or an element for coupling a transmission element to the housing. By the transmission element is meant one of the sun gears or one of the ring gears or one of the planet carriers of the transmission. Furthermore, it is proposed that the axle drive is arranged spatially below the at least one transmission. Preferably, the axle drive is arranged spatially relative to a standing plane of the motor vehicle below the at least one transmission. Preferably, at least a part of the axle transmission is arranged spatially between the transmission and the level of the vehicle. Particularly preferably, a minimum distance of an axis of rotation of the axle gear to the level is less than a minimum distance of a rotation axis of the transmission to the

Ground Level. As a result, in particular an advantageous arrangement of

Motor vehicle transmission device can be achieved. Under a "level of the

Motor vehicle "should be understood in this context, in particular a plane which extends through the tire support points of the wheels of the motor vehicle.

It is further proposed that the at least one ring gear of the transmission causes a reversal of the direction of rotation of the at least one transmission to the axle drive. Preferably, the direction of rotation reversal is due to the direct connection of the ring gear to the axle, so in particular without an intermediate. The transmission therefore has in particular a plurality of "reverse gears" and at least one

As a result of the connection to the axle gearbox, these gears are reversed without an intermediate gear, which means that gearboxes with multiple "reverse gears" can be used and, despite everything, a compact design can be achieved.

Furthermore, the invention is based on a drive train with the drive unit and with the motor vehicle transmission device. It is proposed that the at least one ring gear of the transmission of the motor vehicle transmission device is arranged in the axial direction on a half of the transmission facing the drive side. This can be achieved in particular that the axle drive advantageous close to the

Drive unit is arranged. This in turn can be achieved that the drive unit can be advantageously arranged centrally. This is particularly advantageous in a motor vehicle with front-transverse transmission, ie with transverse mounting and front-wheel drive. Including that the "ring gear is arranged in the axial direction on one of the drive side facing half of the transmission" should be understood in this context in particular, that the ring gear, with an imaginary division of the transmission in two halves, wherein a parting plane in particular perpendicular to a rotation axis of the transmission and passes through a geometric center, is arranged in the half of the transmission, which is assigned to the drive unit. Preferably, the ring gear, viewed in the axial direction, arranged in an end portion of the transmission facing the drive unit.

Further advantages will become apparent from the following description of the figures. In the figures, an embodiment of the invention is shown. The figures, the description of the figures and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations.

Showing:

Fig. 1 is a schematic representation of a motor vehicle with a

Powertrain in a schematic representation and

2 shows the drive train with a drive unit and with a

Motor vehicle transmission device in a schematic representation.

1 shows schematically a motor vehicle 22. The motor vehicle 22 is exemplified by a car. The motor vehicle 22 is of a front-wheel drive

Motor vehicle formed. The motor vehicle 22 comprises a drive train 20, via which driving wheels 23 of the motor vehicle 22 are not further visible. The drive train 20 comprises a drive unit 15. The drive unit 15 is formed by an internal combustion engine. The drive unit 15 is installed transversely. The drive train 20 is installed transversely. The drive unit 15 is transverse to a

installed straight ahead. Furthermore, the drive train 20 has a motor vehicle transmission device 10. The drive unit 15 has a driven drive shaft 14. The drive shaft 14 extends perpendicular to an intended straight ahead direction of the motor vehicle 22nd

The motor vehicle transmission device 10 has a transmission 11. The transmission 11 is provided for providing a translation. The transmission 11 is connected to the

Drive unit 15 coupled. The transmission 11 is connected to the drive shaft 14 of the

Drive unit 15 coupled. The drive unit 15 is in an operation to do so

intended to drive the gear 11. The transmission 11 is intended to translate a speed of the drive unit 15 from a drive side to an output side. The transmission 11 is at least partially formed by a planetary gear. The transmission 11 is exemplified by a planetary gear. However, it would also be conceivable that the transmission 11 different from a planetary gear comprises translation-forming elements. The transmission 11 comprises at least one planetary gearset 16, 17, 18. The transmission 11 comprises three planetary gear sets 16, 17, 18. In principle, however, another would be useful to a person skilled in the art

appearing number of planetary gear sets 16, 17, 18 conceivable. The planetary gear sets 16, 17, 18 each have a sun gear 24, a ring gear 12 and a plurality of planetary gears 26 guided by a planet carrier 25 on a circular path around the sun gear 24. Of the three planetary gear sets 16, 17, 18, only a first planetary gear set 16 is shown schematically completely (FIG. 2).

Particularly preferably, the transmission has exactly two planetary gear sets, namely the first planetary gear 16 of the planetary gear sets 16, 17, 18 and a second

Planetary gear 17 of the planetary gear sets 16, 17, 18 on.

The transmission 11 has the ring gear 12. The ring gear 12 forms a first ring gear of the transmission 11. The ring gear 12 of the transmission 1 1 is coaxial with the drive shaft 14 of the transmission 11 driving drive unit 15 is arranged. The entire transmission 1 1 is arranged coaxially with the drive shaft 14. The ring gear 12 is the first

Planetary gear 16 or the second planetary gear 17 assigned. The ring gear 12 is associated with the first planetary gear 16. The ring gear 12 forms the ring gear of the first planetary gear set 16. The ring gear 12 of the transmission 11 of

Motor vehicle transmission device 10 is arranged in the axial direction 21 on a drive side facing half of the transmission 11. The ring gear 12 is, in an imaginary division of the transmission 11 in two halves, wherein a parting plane perpendicular to a rotational axis of the transmission 11 and through a geometric center, arranged in the half of the gear 11, which faces the drive unit 15. The ring gear 12, viewed in the axial direction 21, arranged in an end portion of the transmission 11 facing the drive unit 15. The

Rotation axis of the transmission 11 extends parallel to the axial direction 21 of the transmission 11. Further, the ring gear 12 of the transmission 11 has an external toothing. The ring gear 12 has an internal toothing and an external toothing (FIG. 2).

Furthermore, the motor vehicle transmission device 10 has a driven axle coupled to the transmission 11 axle drive 13. The axle drive 13 is provided to transmit a force transmitted by the drive unit 15 to the transmission 11 on shafts 27, 28 of the drive wheels 23 of the motor vehicle 22. The shafts 27, 28 are connected directly to the drive wheels 23. The axle drive 13 has for this purpose a spur gear 29, which is coupled directly to the shafts 27, 28. The axle 13 is for example, formed by a differential gear. The axle drive 13 is arranged spatially below the transmission 11. The axle drive 13 is spatially arranged relative to a standing plane 30 of the motor vehicle 22 below the transmission 11. The axle drive 13 is arranged spatially between the transmission 11 and the level 30 of the motor vehicle 22. A minimum distance of a rotation axis of the

Achsgetriebes 13 to the level 30 is therefore less than a minimum distance of an axis of rotation of the transmission 11 to the level 30 (Figure 2).

The ring gear 12 of the transmission 11 is coupled via the external toothing with the axle drive 13. The ring gear 12 of the transmission 11 is permanently coupled via the external teeth with the axle 13. The external teeth of the ring gear 12 meshes directly with a toothing of the transaxle 13. The external teeth of the ring gear 12 meshes directly permanently with a toothing of the spur gear 29 of the final drive 13. A final offset on the output side of the transmission 11 therefore takes place via the external teeth of the ring gear 12th Since the internally toothed ring gear 12 also has an external toothing at the same time, which leads directly to the final drive, that is to say the axle gear 13, this gear ratio stage can be realized in a space-neutral manner in the axial length. Thereby, the axial length, in particular of the drive train 20, insbersondere be reduced by one wheel width. The ring gear 12 of the transmission 11 causes a reversal of the direction of rotation of the transmission 11 to the axle drive 13. The direction of rotation is reversed due to the direct connection of the ring gear 12 to the axle transmission 13. The transmission 11 therefore has several "reverse gears" and a "forward gear", because these gears are reversed by the connection to the axle 13 without intermediate (Figure 2).

Furthermore, the motor vehicle transmission device 10 has a housing 19. The housing 19 forms an oil chamber. The housing 19 is filled with oil, in particular with gear oil. The housing 19 is integrally formed. In principle, however, it would also be conceivable that the housing 19 is designed in several parts. Further, the housing 19 is provided to receive the transmission 11 and the axle 13. The housing 19 receives the gear 11 and the axle 13. The gear 11 and the axle 13 are arranged in the oil chamber (Figure 2).

Particularly preferably, the transmission 11 is designed such that exactly two

different switchable translations can be displayed. Particularly preferably, the transmission 11 has exactly two switching elements 31, 32, namely a first switching element 31 and a second switching element 32. In FIG. 2, the switching elements 31, 32 are shown only schematically. The switching elements 31, 32 can be used to couple two gear elements of one and the same planetary gear sets 16, 17 or to a coupling of a transmission element of the first planetary gear set 16 with a transmission element of the second planetary gear set 17 or to a coupling of one of the transmission elements of the planetary gear sets 16, 17 may be provided with the housing 19.

Daimler AG

LIST OF REFERENCE NUMBERS

10 motor vehicle transmission device

11 gears

12 ring gear

13 axle drive

14 drive shaft

15 drive unit

16 planetary gear set

17 planetary gear set

18 planetary gear set

19 housing

20 powertrain

21 direction

22 motor vehicle

23 drive wheel

24 sun wheel

25 planet carrier

26 planetary gear

27 wave

28 wave

29 spur gear

30 level

31 first switching element

32 second switching element

Claims

Daimler AG claims

1. powertrain with a drive unit (15) and with a

Motor vehicle transmission device (10), which comprises a transmission (11) which has at least one ring gear (12) and an output side with the transmission (11) coupled axle drive (13),

wherein the at least one ring gear (12) of the gearbox (11) is arranged in the axial direction (21) on an end of the gearbox (11) facing the drive unit (15),

wherein the at least one ring gear (12) of the transmission (11) has an external toothing which meshes directly with a toothing of the axle drive (13), characterized in that

the transmission (11) to provide at least two switchable

Translations is formed and that the axle gear (13) is arranged radially outside of the ring gear (12).

2. Drive train according to claim 1,

characterized in that

the at least one ring gear (12) of the gearbox (11) is arranged coaxially with a drive shaft (14) of a drive unit (15) driving the gearbox (11).

3. Drive train according to claim 1 or 2,

characterized in that

the at least one ring gear (12) of the transmission (11) and a drive wheel of the axle transmission (13) are arranged in a common wheel plane.

4. Drive train according to one of the preceding claims,

characterized in that

the transmission (11) has exactly two planetary gear sets (16, 17).

5. Drive train according to one of the preceding claims,

characterized in that

the transmission (1 1) exactly two switching elements (31, 32).

6. Drive train according to one of the preceding claims,

marked by

a housing (19) which forms an oil chamber and is provided to receive the at least one transmission (11) and the at least one axle drive (13).

7. Drive train according to one of the preceding claims,

characterized in that

the axle drive (13) is arranged spatially below the at least one transmission (11).

8. Drive train according to one of the preceding claims,

characterized in that

the at least one ring gear (12) of the transmission (11) of the

Motor vehicle transmission device (10) in the axial direction (21) on a drive side facing side of the transmission (11) is arranged.

9. Drive train according to claim 8,

characterized in that

the at least one ring gear (12) of the transmission (11) is arranged coaxially to a rotor of an electric motor of the drive unit (15).