DE102017008275A1 - Multi-step transmission for a motor vehicle, in particular for an electric or hybrid vehicle - Google Patents

Abstract

The invention relates to a multistage transmission (10) for a motor vehicle, having a drive shaft (12) via which torques can be introduced into the multistage transmission (10), having an output shaft (20) via which torques of the multistage transmission (10) can be provided. with a first planetary gear set (28) having a first sun gear (34), a first planetary carrier (36) and a first ring gear (38), with a second planetary gear set (30) having a second sun gear (42), a second planet carrier (44) and a second ring gear (46), and with a third planetary gear set (32) having a third sun gear (50), a third planet carrier (52) and a third ring gear (54), wherein the drive shaft (12) permanently non-rotatably coupled to the first planetary carrier (36) and the second ring gear (46), and wherein the third planetary carrier (52) permanently non-rotatably coupled to the output shaft (20).

Description

The invention relates to a multi-speed transmission for a motor vehicle, in particular for an electric or hybrid vehicle.

The DE 10 2011 006 940 A1 discloses a hybrid drive for a vehicle, with an internal combustion engine, with at least one electric machine and with a planetary gearbox. In this case, at least one retarder is provided as a wear-free starting element, which is connected to the transmission.

Object of the present invention is to provide a multi-speed transmission for a motor vehicle, so that a particularly advantageous and in particular efficient operation can be realized in a simple manner.

This object is achieved by a multi-speed transmission with the features of claim 1. Advantageous embodiments with expedient developments of the invention are specified in the remaining claims.

The multistage transmission according to the invention for a motor vehicle, in particular for an electric or hybrid vehicle, has a drive shaft via which torques can be introduced into the multistage transmission. The torques to be introduced via the drive shaft into the multistage transmission are or are provided or made available, for example, by at least one drive motor, wherein the drive motor can be designed, for example, as an internal combustion engine or electric machine or electric motor. If torques are introduced into the multistage transmission via the drive shaft, then the multistage transmission is driven.

The multistage transmission further has an output shaft via which torques can be provided by the multistage transmission. In other words, the multi-stage transmission can provide torques via its output shaft, by means of which, for example, at least one or more wheels of the motor vehicle and, for example, the motor vehicle as a whole can be driven. For example, the torques to be introduced via the drive shaft into the multistage transmission are also referred to as drive torques or drive torques, the torques provided by the multistage transmission via the output shaft also being referred to as output torques or output torques.

Furthermore, the multistage transmission has at least or preferably exactly three planetary gear sets. A first of the planetary gear sets has a first sun gear, a first planet carrier, and a first ring gear. A second of the planetary gear sets has a second sun gear, a second planet carrier and a second ring gear. A third of the planetary gear sets has a third sun gear, a third planet carrier and a third ring gear. In this case, the drive shaft is permanently rotatably coupled to the first planet carrier and the second ring gear, wherein the third planet carrier is permanently rotatably coupled to the output shaft. Under the respective permanently non-rotatable coupling is to be understood in particular that a permanent non-rotatable connection, in this case between the drive shaft, the first planet carrier and the second ring gear and between the third planet carrier and the output shaft, wherein the permanent non-rotatable connection is permanent, that is not can be solved as needed by means of a switchable switching element and restored, but the drive shaft, the first planet carrier and the second ring gear or the third planet carrier and the output shaft are always connected to each other rotationally fixed.

The sun gears, the planet carrier and the ring gears are respective elements or components of the planetary gear sets, also referred to simply as planetary gear sets, wherein, for example, when the multi-speed transmission is driven, the respective component rotates relative to a housing of the multi-speed transmission about an axis of rotation also called the main axis of rotation, In particular, when the respective component is not about rotatably coupled to the housing or rotatably fixed to the housing.

Characterized in that the drive shaft permanently rotatably coupled to the first planetary carrier and the second ring gear, run the drive shaft, the first planet carrier and the second ring gear together or as a block, in particular about said main axis of rotation, or rotate together or simultaneously to the Main axis of rotation relative to the housing when the multi-stage transmission is driven. Accordingly, the third planetary carrier and the output shaft, in that the third planetary carrier and the output shaft are rotatably coupled to each other, run together as a block, in particular about the main axis of rotation, and thus rotate together about the main axis of rotation relative to the housing when the multi-speed transmission is driven. In the multi-speed transmission, a particularly advantageous translation of the multi-speed transmission can be realized in particular by the respective permanently rotationally fixed connection in space and weight-favorable manner, so that a particularly advantageous and in particular more efficient, that is, energy-saving operation can be realized.

Furthermore, while the planetary gear sets can be designed as a simple planetary gear sets, so that the advantageous translation can be displayed in a particularly cost and space-saving manner. In addition, the requirement is created to create a plurality of advantageous, switchable gears or gear ratios, so that a particularly advantageous operation can be realized. Overall, it can be seen that the multi-step transmission is based on coupled planetary gear sets, so that the power loss of the multi-speed transmission can be kept very low. In particular, it is possible to provide six gears, in particular in the form of forward gears for effecting forward travel of the motor vehicle, whereby a large spread can be achieved. For this purpose, the planetary gear sets can be configured as a simple planetary gear sets to keep costs low. Furthermore, a particularly good gear efficiency can be realized, so that losses can be kept low.

In an advantageous embodiment of the invention, the first ring gear is permanently rotatably coupled to the third sun gear, which in space and weight-favorable way, a particularly advantageous translation can be realized.

In particular, it can be provided that the aforementioned gears differ from one another in their respective ratios, so that it is possible, for example by means of the multi-speed transmission, to convert the drive torques by means of the respective transmission into the different output torques of the drive torques.

In order to realize a particularly advantageous operation, it is provided in a further embodiment of the invention that the multi-speed transmission has a first switching element, by means of which the second planet carrier rotatably coupled to the third planet carrier. The first switching element is, for example, switchable between at least one first release state and at least one first blocking state, in particular movable. For example, the first release state corresponds to a first release position, wherein the first lock state corresponds to a first lock position of the first shift element. In this case, for example, the first switching element between the first release position and the first blocking position, in particular relative to the housing and / or translationally movable, so that the first switching element can be switched as needed between the first blocking state and the first release state. In the first blocking state, the second planet carrier is non-rotatably coupled by means of the first switching element to the third planet carrier, so that in particular when the multi-stage transmission is driven, the second planet carrier and the third planet carrier jointly or simultaneously circulate as a block about the main axis of rotation and thus relative to Turn the housing around the main axis of rotation. In the first release state, however, for example, the first switching element releases the second planet carrier for relative rotation to the third planet carrier, so that, for example, the second planet carrier and the third planet carrier rotate about the main axis of rotation relative to each other when the multi-stage transmission is driven.

As further particularly advantageous, it has been shown, when a second switching element is provided, by means of which the second planet carrier rotatably coupled to the first ring gear and / or with the third sun gear. In this case, the previous and following statements on the first switching element are also transferable to the second switching element, so that, for example, the second switching element between at least a second release state and at least a second blocking state switchable, in particular movable. The second blocking state corresponds, for example, to a second blocking position, wherein the second enabling state corresponds, for example, to a second releasing position of the second switching element. In this case, for example, the second switching element between the second blocking position and the second release position, in particular relative to the housing and / or translationally, movable, so that the second switching element can be switched particularly needs-based between the second blocking state and the second release state. In the second blocking state, the second planetary carrier by means of the second switching element rotatably coupled to the first ring gear and / or with the third sun gear, so that the second planet carrier and the first ring gear and / or the third sun gear rotate together or simultaneously as a block around the main axis of rotation and thus rotate about the main axis of rotation relative to the housing when the multi-stage transmission is driven. In the second release state, however, the second shift element releases the second planet carrier for relative rotation to the first ring gear and / or to the third sun gear, so that, in particular when the multi-speed transmission is driven, the second planet carrier rotates about the main axis of rotation relative to the first ring gear and / or rotates relative to the third sun gear when the multi-stage transmission is driven.

In a further embodiment of the invention, the housing is provided, in which the planetary gear sets are accommodated. It has shown to be advantageous if a third switching element is provided, by means of which the first sun gear rotatably coupled to the housing, that is rotatably fixed to the housing. The previous and following statements on the first switching element and the second switching element are readily transferable to the third switching element and vice versa. The third switching element is thus switchable, for example, between at least one third release state and at least one third blocking state, in particular movable. In this case, for example, the third blocking state corresponds to a third blocking position, the third enabling state corresponding to a third releasing position of the third switching element. In this case, the third switching element, for example, between the third blocking position and the third release position, in particular relative to the housing and / or translationally, movable, so that the third switching element can be switched as needed between the third blocking state and the third release state.

In the third blocking state, the first sun gear is rotatably coupled to the housing by means of the third switching element, so that the first sun gear does not rotate relative to the housing, in particular even when the multistage transmission is driven. However, in the third release state, the third shift element releases the first sun gear for relative rotation to the housing so that the first sun gear can rotate about the main rotational axis relative to the housing, or rotate when the multi-speed transmission is driven.

In order to realize a particularly advantageous operation, in particular a particularly advantageous drivability, it is provided in a further embodiment of the invention that the multi-speed transmission has a fourth switching element, by means of which the second sun gear and / or the third ring gear rotatably connected to the housing are or is. The previous and following statements on the first switching element, the second switching element and the third switching element are readily applicable to the fourth switching element and vice versa. The fourth switching element can be switched, for example, between at least one fourth enabling state and at least one fourth blocking state, in particular being movable. In this case, for example, the fourth release state corresponds to a fourth release position, wherein the fourth blocking state corresponds, for example, to a fourth blocking position of the fourth shifting element. In this case, for example, the fourth switching element between the fourth blocking position and the fourth release position, in particular relative to the housing and / or translationally, movable, so that the fourth switching element can be switched between the fourth release state and the fourth blocking state as needed. In the fourth blocking state, the second sun gear and / or the third ring gear by means of the fourth switching element rotatably connected to the housing, that is rotatably fixed to the housing, so that the second sun gear and / or the third ring gear, especially not then relative to the Can rotate or rotate housing when the multi-speed transmission is driven. However, in the fourth enabled state, the fourth shift element releases the second sun gear and / or the third ring gear for relative rotation to the housing such that, for example, the second sun gear and / or the third ring gear can rotate about the main axis of rotation relative to the housing, when the multi-speed transmission is driven.

In order to keep the number of parts, the cost and weight particularly low, it is preferably provided that the multistage transmission has exactly or only four switching elements, the exactly four switching elements are the aforementioned switching element and thus by the first switching element, the second switching element , the third switching element and the fourth switching element are formed. In this way, by the use of preferably exactly three planetary gear sets, which are preferably designed as simple planetary gear sets, and the exactly four switching elements, a particularly advantageous switchability of the multi-speed transmission can be realized. In particular, a plurality of switchable gears can be realized in this way, wherein, for example, at least or exactly six gears can be realized. In particular, by the use of the switching elements of the respective gear can be activated or inserted as needed, while the other remaining gears are disabled or designed. As a result, a particularly advantageous operation can be realized. In particular, a particularly large spread can be displayed in a simple manner.

In a further embodiment of the invention, an electric machine is provided, which has a stator and a rotor rotatable relative to the stator. The electric machine can provide torques, in particular drive torques, for example via the rotor. In this case, the rotor is rotatably coupled to the first planet carrier and rotatably connected to the second ring gear or coupled, so that the rotor is connected to the first planet carrier and the second ring gear. As a result, the first planet carrier and the second ring gear can be driven by the electric machine, in particular by the rotor. Through this connection of the rotor to the first Planet carrier and the second ring gear, a particularly compact design can be realized, the multi-step transmission can be designed as an electric or hybrid drive.

Under the feature that the rotor is non-rotatably coupled to the first planet carrier and the second ring gear, is to be understood in particular that the rotor, for example, permanently rotatably coupled to the first planet carrier and with the second ring gear or connected. Under the feature that the rotor rotatably coupled to the first planet carrier and the second ring gear can be understood in particular that, for example, a coupling element such as a clutch is provided, wherein the coupling element, for example, opened and closed and thus between an open state and a Closed state can be switched. In the closed state, for example, the rotor is non-rotatably coupled to the first planet carrier and the second ring gear, in particular by means of the coupling element, so that then the first planet carrier and the second ring gear can be driven via the coupling element of the rotor. In the open state, however, for example, the rotor is decoupled from the first planet carrier and the second ring gear.

In order to keep the particular axial space requirement of the multi-speed transmission in a particularly small frame, it is provided in a further embodiment of the invention that the first planetary gear and / or the second planetary gear in the radial direction of the multi-speed transmission or the respective planetary gear set outwardly at least partially , in particular at least predominantly or completely, is covered by the rotor and / or the stator of the electric machine.

A further embodiment is characterized in that the drive shaft has an input at which the torques to be introduced into the multistage transmission can be transmitted to the drive shaft. In particular, the input is provided on a first, in particular free, end of the drive shaft, so that the drive shaft can be coupled non-rotatably to the input or to the first free end, for example with the drive motor. In this case, the output shaft has an output at which the torques that can be provided by the multistage transmission can be diverted from the output shaft or can be diverted from the output shaft. The output is provided for example at one, in particular free, second end of the output shaft, so that, for example, the output shaft at the second free end or at the output with another shaft of the multi-speed transmission or the motor vehicle is rotatably coupled. It is provided that the electrical machine is at least partially, in particular at least predominantly or completely, arranged on a first side of the third planetary gear set, while the input and the output or the free ends on one of the first side in the axial direction of the multi-speed transmission or the third planetary gear set opposite second side of the third planetary gear set are arranged. In this way it is possible, for example, to arrange the input, which is also referred to as the drive, and the output, respectively, at the front or on a front side and the electric machine at the rear or at a rear side, so that a particularly compact construction or installation can be represented ,

A further advantageous development of the invention consists in that the second planetary gear set is stacked on the third planetary gear set. By the stacked arrangement, it is meant that the second planetary gearset circumferentially surrounds the first planetary gearset. The second sun gear and the third ring gear are designed as a gear, which has a second sun gear forming external teeth and a third ring gear forming internal teeth. Finally, it has proven to be particularly advantageous if an internal combustion engine with a second output shaft and a separating clutch are provided, via which drive shaft can be driven by the second output shaft and thus by the internal combustion engine. The separating clutch can be opened and closed, for example, and thus switched between an open state and a closed state. In the closed state, the second output shaft is non-rotatably connected via the separating clutch to the drive shaft, so that the drive shaft can be driven via the separating clutch from the second output shaft and thus from the internal combustion engine. In the opened state of the separating clutch, however, for example, the drive shaft is decoupled from the second output shaft.

Further advantages, features and details of the invention will become apparent from the following description of preferred embodiments and from the drawing. The features and feature combinations mentioned above in the description as well as the features and feature combinations mentioned below in the description of the figures and / or shown alone in the figures are not only in the respectively indicated combination but also in other combinations or in Used alone, without departing from the scope of the invention.

• 1 eine schematische Darstellung eines erfindungsgemäßen Mehrstufengetriebes gemäß einer ersten Ausführungsform;
• 2 eine schematische Darstellung des Mehrstufengetriebes gemäß einer zweiten Ausführungsform; und
• 3 eine schematische Darstellung des Mehrstufengetriebes gemäß einer vierten Ausführungsform.

The drawing shows in:

• 1 a schematic representation of a multi-speed transmission according to the invention according to a first embodiment;
• 2 a schematic representation of the multi-speed transmission according to a second embodiment; and
• 3 a schematic representation of the multi-speed transmission according to a fourth embodiment.

In the figures, the same or functionally identical elements are provided with the same reference numerals.

1 shows a schematic representation of a first embodiment of a multi-speed transmission 10 for a motor vehicle, in particular for an electric or hybrid vehicle. The multistage transmission 10 has a drive shaft 12 on which in 1 through an arrow 14 illustrated and also referred to as drive torques or drive torques in the multi-speed transmission 10 can be introduced. By introducing the drive torques into the multistage transmission 10 becomes the multistage transmission 10 driven. The drive shaft 12 has an input also referred to as a drive 16 on, on which the drive torque in the drive shaft 12 can be initiated or initiated. In this case, the drive shaft 12 at her entrance 16 a first free end 18 on, on which the drive shaft 12 For example, rotatably with an in 1 not shown output shaft of a drive motor, in particular an internal combustion engine, can be coupled or coupled. The output shaft of the drive motor can provide the drive torque, which at the input 16 and thus especially about the free end 18 in the drive shaft 12 can be initiated and in 1 through the arrow 14 are illustrated.

Furthermore, the multi-step transmission 10 an output shaft 20 on. To the output shaft 20 of the multi-speed transmission 10 be able to distinguish conceptually from the aforementioned output shaft of the drive motor, the output shaft 20 Also referred to as the first output shaft, for example, the output shaft of the drive motor is referred to as the second output shaft. About the output shaft 20 can the multi-speed transmission 10 Also referred to as output torques or output torques and in 1 through an arrow 22 provide illustrated torques. In this case, for example, the output shaft 20 an output also called the output 24 on, on which the output torque from the output shaft 20 derived or from the output shaft 20 are divisible. At the output 24, the output shaft 20 for example, a second free end 26 on, on which the output shaft 20 For example, with at least one other shaft of the motor vehicle rotatably connected or connected. Thus, the output torques on the second free end 26 from the output shaft 20 discharged and introduced into the further wave, thereby the further shaft of the output shaft 20 drive. About the further shaft, for example, not shown in the figures wheels of the motor vehicle from the output shaft 20 be driven to drive by driving the wheels, for example, the motor vehicle as a whole.

The multistage transmission 10 also has exactly three planetary gear sets 28 . 30 and 32, which are formed as simple planetary gear sets. The planetary gear set 28 is also referred to as a first planetary gear set and has a first sun gear 34 , a first planet carrier 36 and a first ring gear 38 on. In addition, the first planetary gearset points 28 at least a first planetary gear 40 on which with the first sun gear 34 and with the first ring gear 38 meshes and rotatable on the first planetary carrier 36 is stored.

The second planetary gear set 30 has a second sun gear 42 , a second planet carrier 44 and a second ring gear 46 on. In addition, the second planetary gearset 30 at least a second planetary gear 48 on, which with the second sun gear 42 and with the second ring gear 46 meshes and rotatably on the second planetary carrier 44 is stored. Further, the third planetary gearset 32 a third sun wheel 50 , a third planet carrier 52 , and a third ring gear 54 on. Furthermore, the third planetary gearset includes 32 at least a third planetary gear 56 , which with the third sun wheel 50 and with the third ring gear 54 meshes while rotatably on the planet carrier 52 is stored.

In addition, the multi-speed transmission points 10 a in 1 particularly schematically illustrated housing 58 in which the planetary gear sets 28 . 30 and 32 are included. The sun wheels 34 . 42 and 50 , the planet carrier 36 . 44 and 52 and the ring gears 38 . 46 and 54 are respective elements or components of the planetary gear sets 28 . 30 and 32 , wherein the respective component in particular when the multi-stage transmission 10 is driven and if the respective component is not rotationally fixed to the housing 58 is set to a rotation axis also called the main axis of rotation 60 relative to the housing 58 can rotate or rotate.

In order to realize a particularly advantageous and in particular efficient operation in a simple manner, the drive shaft 12 permanently rotatable with the first planet carrier 36 and with the second ring gear 46 coupled so that, for example, the planet carrier 36 and the ring gear 46 permanently rotatably coupled with each other. In addition, the third planet carrier 52 permanently non-rotatable with the output shaft 20 coupled. Due to the non-rotatable coupling of the planet carrier 36 and the ring gear 46 the planet carrier run 36 and the ring gear 46 together and thus as a block around the main axis of rotation (rotation axis 60 ) and thus rotate about the axis of rotation 60 relative to the housing 58 especially if the multi-step transmission 10 is driven.

It is also in the multi-speed transmission 10 provided that the planetary gear sets 28, 30 and 32 in with the axis of rotation 60 coincident axial direction of the multi-speed transmission 10 and thus the respective planetary gear sets 28 . 30 and 32 coaxial with each other and thus arranged one behind the other or successively, so that the planetary gear sets 28 . 30 and 32 not stacked. Furthermore, at the in 1 shown first embodiment, such a coaxial arrangement provided that the input 16 and the exit 24 in the axial direction of the multi-speed transmission 10 opposite sides 62 and 64 , in particular of the third planetary gear set 32 , are arranged. Furthermore, the entrance 16 and the exit 24 arranged coaxially with each other.

In addition, it is envisaged that the ring gear 38 permanently rotatable with the sun gear 50 is coupled. Furthermore, the second sun gear 42 permanently rotationally fixed with the third ring gear 54 coupled.

The multistage transmission 10 also has a first switching element 66 on, by means of which the second planet carrier 44 rotatably with the third planet carrier 52 can be coupled. In addition, a second switching element 68 provided by means of which the second planet carrier 44 rotatably with the first ring gear 38 and the third sun wheel 50 can be coupled. The multistage transmission 10 also includes a third switching element 70 , by means of which the first sun wheel 34 rotatably with the housing 58 coupled and thus rotationally fixed to the housing 58 is determinable. Furthermore, a fourth switching element 72 provided by means of which the second sun gear 42 and the third ring gear 54 rotatably with the housing 58 can be coupled or connectable. Overall, it can be seen that the multi-speed transmission 10 exactly three planetary gear sets in the form of planetary gear sets 28 . 30 and 32 and exactly four switching elements in the form of the switching elements 66 . 68 . 70 and 72 having. This allows a particularly advantageous switchability of the multi-speed transmission 10 being represented. In particular, it is possible to realize at least or exactly six switchable and thus insertable and interpretable gears, these gears are formed, for example, as forward driving gears for effecting a forward drive of the motor vehicle. In particular, a particularly large spread of the multi-speed transmission 10 represented, for example, the respective gears have respective translations. In this case, the respective gears differ in their respective translations, so that by means of the respective gear, the respective drive torques can be converted into the respective, different from the respective drive torque output torques. In this case, the respective drive torques are converted into the respective output torques by means of the respectively activated or engaged gear, while one of the gears is engaged and thus activated, the remaining gears are deactivated and thus designed.

Furthermore, an optional electric machine 74 intended. It should be noted at this point that - as previously stated - the electric machine 74 is optionally provided and thus may be omitted alternatively. The electric machine 74 has a stator 76 and a rotor 78 which is about a rotor axis of rotation relative to the stator 76 is rotatable. The rotor axis of rotation coincides, for example, with the axis of rotation 60 together. In particular, the rotor 78 from the stator 76 drivable and thereby about the rotor axis of rotation (axis of rotation 60 ), in particular relative to the housing 58 , It is envisaged that the rotor 78 at the planet carrier 36 and the ring gear 46 connected and thereby rotatably with the planet carrier 36 and with the ring gear 46 connected is. In particular, the rotor 78 permanently rotatable with the planet carrier 36 and the ring gear 46 connected. Thus, the planet carrier 36 and the ring gear 46 from the rotor 78 and thus of the electric machine 74 drivable, so that, for example, further torques in the form of further drive torques or drive torques, which of the electric machine 74 be provided over the planet carrier 36 and the ring gear 46 in the multistage transmission 10 can be initiated. In order to keep in particular the axial space requirements particularly low, is the first planetary gear 28 and / or the second planetary gear set 30 in the radial direction of the multi-speed transmission 10 or of the respective planetary gear set 28 . 30 respectively 32 outwardly at least partially, in particular at least predominantly or completely, by the rotor 78 and / or the stator 76 covered. In other words, for example, the stator surrounds 76 and / or the rotor 78 the first planetary gear set 28 and or the second planetary gear set 30 outside circumference at least partially, in particular at least predominantly or completely.

In particular, the switching element 68 designed as an integrated starting element, so that, for example, when the switching element 68 is open or opened, the second output shaft of the drive motor run, that is, can be rotated without the wheels of the motor vehicle or the motor vehicle is driven and without the example designed as an internal combustion engine or internal combustion engine drive motor is strangled. In particular, while the switching element 68 be designed as a clutch and thereby in particular as a friction clutch. Furthermore, it is conceivable, for example, that the switching element 68 is designed as another starting element such as a hydrodynamic torque converter.

The respective switching element 66 . 68 . 70 and or 72 can for example be designed as a frictional engagement element and in particular as a friction clutch or multi-plate clutch or as a form-locking switching element and thereby, for example, as a claw or dog clutch, thereby realizing, for example, a particularly efficient operation. In particular, the respective switching element 66 . 68 . 70 and or 72 be designed as positive switching element with or without synchronization unit to keep losses particularly low.

The multistage transmission 10 offers the possibility to display a hybrid and / or four-wheel functionality in a simple way. In addition, can be achieved by a clever integration of the electric machine 74 set various electrical or virtual gears, thereby eliminating a further starting element. In addition, the multi-step transmission 10 suitable for transverse installation and longitudinal installation. Is this multi-step transmission 10 For example, installed longitudinally, so the axis of rotation runs 60 in the vehicle longitudinal direction. Is this multi-step transmission 10 installed transversely, so the axis of rotation runs 60 in vehicle transverse direction. For example, the in 1 shown first embodiment provided for longitudinal installation. 2 shows a second embodiment, wherein 3 a third embodiment shows. The second and the third embodiment is provided, for example, for the transverse installation.

At the in 2 shown second embodiment are the input 16 and the exit 24 on the same page 64 , in particular of the third planetary gear set 32 arranged. In the first and second embodiments, the output is 24 on the website 64 of the planetary gear set 32 arranged while the electric machine 74 on the side 64 in the axial direction opposite side 62 of the planetary gear 32 is arranged. In the second, third and fourth embodiments, the electric machine 74 on the website 62 of the planetary gear set 32 arranged while the entrance 16 and the exit 24 on the side 62 in the axial direction opposite side 64 are arranged. The arrangement of the entrance 16 and the output 24 on the website 64 and the simultaneous arrangement of the electric machine 74 on the side 62 is advantageous for the transverse installation, since then the output particularly advantageous between the example designed as an internal combustion engine drive motor and the multi-speed transmission 10 via a gear designed, for example, as a spur gear 80 goes. The first embodiment is advantageous for the longitudinal installation, since then at the entrance 16 has a large diameter available, for example, at the entrance 16 the drive motor to the drive shaft 12 to be able to connect. Also regarding 2 and 3 be explicitly mentioned that the electric machine 74 is optional and thus can be omitted.

At the in 3 illustrated third embodiment, the drive motor in the form of in 3 provided with 82 designated internal combustion engine. There is also a disconnect clutch 84 provided, via which the drive shaft 12 from the in 3 86 denotes the second output shaft of the internal combustion engine 82 and thus of the internal combustion engine 82 is drivable. Here is the disconnect clutch 84 at the free end 18 the drive shaft 12 provided so that the drive shaft 12 over her entrance 16 and the disconnect clutch 84 from the second output shaft 86 can be driven. By using both the electric machine 74 as well as the internal combustion engine 82 a hybrid functionality can be realized so that the multi-stage transmission 10 for example, is designed as a hybrid drive and can be used.

Furthermore, it is possible to have at least one, several or all planetary gear sets 28 . 30 and 32 at least partially, in particular at least predominantly or completely, in the rotor 78 to integrate. It is also possible, at least one, some or all switching elements 66 . 68 . 70 and 72 at least partially, in particular at least predominantly or completely, in the rotor 78 to integrate. In addition, a wide storage of the electric machine 74 represented. By using the exactly three planetary gear sets 28 . 30 and 32 and the four switching elements 66 . 68 . 70 and 72 can be realized with a small number of parts at least or exactly six courses and a high spread of, for example, greater than 6. Furthermore, very good gear efficiencies can be represented, and six of six possible gaitings lead to a translation.

It is also particularly advantageous if the second planetary gear set ( 30 ) on the third planetary gear set ( 32 ) is stacked. In this unillustrated arrangement, the second planetary gearset circumferentially surrounds the first planetary gear set. The second sun wheel ( 42 ) and the third ring gear ( 54 ) are designed as a gear which has a second sun gear ( 42 ) forming external teeth and a third ring gear ( 54 ) has internal teeth forming.

QUOTES INCLUDE IN THE DESCRIPTION

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Cited patent literature

• DE 102011006940 A1 [0002]

Claims (11)

Multi-speed transmission (10) for a motor vehicle, comprising a drive shaft (12), via which torques in the multi-stage transmission (10) can be introduced, with an output shaft (20) via which torques of the multi-speed transmission (10) can be provided with a first planetary gear set (28) having a first sun gear (34), a first planet carrier (36) and a first ring gear (38), with a second planetary gear set (30) having a second sun gear (42), a second planetary carrier (44) and a second ring gear (46), and a third planetary gear set (32) having a third sun gear (50), a third planet carrier (52) and a third ring gear (54), said drive shaft (12) permanently rotatably with the the first planetary carrier (36) and the second ring gear (46) is coupled, and wherein the third planet carrier (52) permanently non-rotatably coupled to the output shaft (20). Multi-speed transmission (10) to Claim 1 , characterized in that the first ring gear (38) permanently non-rotatably coupled to the third sun gear (50). Multi-speed transmission (10) to Claim 1 or 2 , characterized in that the second sun gear (42) permanently non-rotatably coupled to the third ring gear (54). Multi-stage transmission (10) according to any one of the preceding claims, characterized in that a first switching element (66) is provided, by means of which the second planetary carrier (44) rotatably coupled to the third planetary carrier (52) can be coupled. Multi-stage transmission (10) according to any one of the preceding claims, characterized in that a second switching element (68) is provided, by means of which the second planet carrier (44) rotatably coupled to the first ring gear (38) and / or the third sun gear (50) can be coupled , Multi-stage transmission (10) according to one of the preceding claims, characterized in that a housing (58) is provided, in which the planetary gear sets (28, 30, 32) are accommodated. Multi-speed transmission (10) to Claim 6 , characterized in that a third switching element (70) is provided, by means of which the first sun gear (34) rotatably coupled to the housing (58) can be coupled. Multi-speed transmission (10) to Claim 6 or 7 , characterized in that a fourth switching element (72) is provided, by means of which the second sun gear (42) and / or the third ring gear (54) rotatably connected to the housing (58) is connectable. Multi-stage transmission (10) according to one of the preceding claims, characterized in that a stator (76) and a relative to the stator (76) rotatable rotor (78) having electrical machine (74) is provided, wherein the rotor (78) rotatably is coupled or coupled to the first planet carrier (36) and the second ring gear (46). Multi-speed transmission (10) to Claim 9 , characterized in that the drive shaft (12) has an input (16), at which the torques to be introduced into the multistage transmission (10) can be transmitted to the drive shaft (12), and the output shaft (20) has an output (24), at which the torques provided by the multi-stage transmission (10) are derivable from the output shaft (20), the electric machine (74) on a first side (62) and the input (16) and the output (24) on one of the first Side (62) in the axial direction opposite second side (64) of the third planetary gear set (32) is arranged. Multi-speed transmission (10) according to one of the preceding claims, characterized in that the second planetary gear set (30) is arranged stacked on the third planetary gear set (32).

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