DE102019206800A1 - Transmission for a motor vehicle - Google Patents

Abstract

A transmission (10) for a motor vehicle (40) has a basic gear set (50), a first input element (11), a second input element (12), a shift element (26) and a further shift element (28). The switching element (26) is set up in such a way that, when the switching element (26) is in a closed state, the first input member (11) is connected to the basic gear set (50). The further switching element (28) is set up in such a way that, in a closed state of the further switching element (28), the second input member (12) is connected to the basic gear set (50). The first input member (11) is coupled to the second input member (12) via a planetary gear set (18). The switching element (26) and / or the further switching element (28) is designed as a form-fitting switching element.

Description

The present invention relates to a transmission for a motor vehicle and a motor vehicle drive train, in particular for a hybrid or electric vehicle.

The document US 9,114,699 B2 discloses a hybrid vehicle comprising an internal combustion engine, a generator and a transmission, wherein a first planetary gear set is arranged on a first main shaft of the transmission.

It is an object of the present invention to specify a transmission and a motor vehicle drive train which are advantageous in terms of functionality and installation space allocation.

According to one aspect of the invention, this object is achieved by a transmission for a motor vehicle. The transmission has a basic gear set, a first input member, a second input member, a shift element and a further shift element.

The transmission can be designed in several stages. The transmission can be set up to shift different gear ratios as gears between an input shaft and an output shaft by actuating corresponding shifting elements. This can be done automatically, for example. The transmission can in particular be set up to suitably implement a tractive force supply from one or more drive machines of the motor vehicle with regard to various criteria.

The basic gear set can have one or more gear set levels, for example. A gear set plane can for example have a planetary gear set and / or a spur gear arrangement. For example, the basic gear set can have an input shaft and an output shaft, in particular precisely one input shaft and precisely one output shaft. The gear set planes can be arranged perpendicular to the input shaft and / or perpendicular to the output shaft. The basic gear set can be a basic transmission.

In the context of the invention, a “shaft” can be understood to mean a rotatable component of the transmission, via which associated components of the transmission are connected to one another in a rotationally fixed manner or via which such a connection can be established when a corresponding switching element is actuated. The shaft can connect the components axially or radially or both axially and radially to one another. The respective shaft can also be present as an intermediate piece, via which a respective component e.g. is connected radially.

In the context of the invention, “axially” can mean an orientation in the direction of an axis along which, for example, one or more planetary gear sets and / or clutches and / or shafts are arranged lying coaxially to one another. “Radial” can be understood to mean an orientation in the direction of the diameter of a shaft which lies on this axis.

The first input member and / or the second input member can for example be connected to an internal combustion engine, for example via one or more shafts and / or via one or more gear wheels. The first input element and / or the second input element can be the drive-side ends of a shift element and / or a clutch, in particular ends of a shift element and / or a clutch, which face an internal combustion engine.

The shift element and / or the further shift element can be set up to optionally connect at least two components of the transmission to one another, in particular to connect them in a rotationally fixed manner, and / or to separate and / or decouple them from one another.

The switching element can for example be a seventh switching element. The switching element can in particular be a direct drive (DD) switching element. The further switching element can be an eighth switching element, for example. The further switching element can in particular be an overdrive (OD) switching element. The terms “seventh” shift element and “eighth” shift element are to be regarded as pure designations, without any indication that the transmission has other shift elements. For example, the transmission can have further shift elements or fewer than seven shift elements. For example, the switching element can also have a first and / or a second switching element.

The shift element is set up in such a way that, in a closed state of the shift element, the first input element is connected to the basic gear set. The shift element can in particular be set up in such a way that, in a closed state of the shift element, an input shaft of the transmission is connected to a first drive shaft. The input shaft can, for example, be directly connected or connectable to an internal combustion engine, for example by means of a clutch, for example by means of a friction clutch. The first drive shaft can, for example, be an input shaft of the basic gear set. The switching element can for example be set up in such a way that, in a closed state of the switching element, the input shaft is connected directly to the first drive shaft, in particular without that a power flow over a gear set level, in particular a planetary gear set, is performed.

The further shift element is set up in such a way that, in a closed state of the further shift element, the second input element is connected to the basic gear set.

The transmission can be set up in such a way that, in an open state of the further shift element, the second input element is not connected to the basic gear set, in particular not to the first drive shaft of the basic gear set.

The first input member is coupled to the second input member via a planetary gear set, for example a third planetary gear set. The expression “third” planetary gear set is to be understood as a pure designation and does not give any indication of any other planetary gear sets that may be present in the transmission. The transmission can for example have more or less than three planetary gear sets.

A planetary gear set, in particular the third planetary gear set, can be present as a minus planetary gear set within the scope of the invention. In the case of a minus planetary gear set, a first element of the respective planetary gear set can be a sun gear, a second element of the respective planetary gear set can be a planet carrier and a third element of the respective planetary gear set can be a ring gear. The planetary web can lead rotatably mounted at least one, but preferably several, planet gears.

Alternatively, one or more planetary gear sets, for example the third planetary gear set, provided that the connection of the respective elements permits, present as a plus planetary gear set, the first element of the respective planetary gear set then being a sun gear and the second element of the respective Planetary gear set is a ring gear and the third element of the respective planetary gear set is a planetary web. In a plus planetary set, the elements sun gear, ring gear and planetary web are also present, the latter leading at least one planetary gear pair.

Wherever a connection of the individual elements allows, a minus planetary gear set can be converted into a plus planetary gear set, whereby the ring gear and the planetary web connection must be swapped with one another compared to the version as a minus planetary gear set, and a gear ratio must be increased by one . Conversely, a plus planetary gear set could also be replaced by a minus planetary gear set, provided that the connection of the elements of the transmission allows this. In this case, in comparison to the plus planetary set, the ring gear and the planetary gear connection would have to be swapped with one another, and a gear ratio reduced by one.

The planetary gear set, that is to say in particular the third planetary gear set, can be present, for example, as a minus planetary gear set. Alternatively, the third planetary gear set can be present as a plus planetary gear set.

The expression “connected” or “coupled” can be understood in the sense of the invention as a coupling of two components so that they cannot rotate independently of one another. If no switching element is provided between two components, these components are permanently coupled so that they cannot rotate independently of one another.

If, on the other hand, a switching element is provided between two components, these components are usually not permanently non-rotatably coupled to one another, but a non-rotatable coupling can only be made by actuating the switching element located between them. An actuation of the switching element in the sense of the invention can mean that the relevant switching element is brought into a closed state and, as a result, the rotational movements of the components directly coupled to it are matched to one another.

If the switching element in question is designed as a form-fitting switching element, the components that are directly connected to one another in a rotationally fixed manner run at the same speed. In the case of a non-positive switching element, on the other hand, there may be speed differences between the components after this non-positive switching element has been actuated. This desired or unwanted state is nevertheless referred to in the context of the invention as a rotationally fixed connection of the respective components via the switching element.

The shift element, in particular the seventh shift element, can in particular be set up to bypass the planetary gear set, in particular the third planetary gear set, in the closed state of the shift element, in particular the seventh shift element. The further switching element, in particular the eighth shifting element can be set up such that in the closed state of the further shifting element, in particular the closed state of the eighth shifting element, a torque is transmitted from the planetary gear set, in particular from the third planetary gear set, to the basic gear set, in particular from an internal combustion engine the third planetary gear set. The further shift element, in particular the eighth shift element, can be set up in such a way that, in a closed state of the further shift element, the third element of the planetary gear set, in particular the ring gear of the third planetary gear set, is rotationally fixed to the first drive shaft of the basic gear set, i.e. the input shaft of the basic gear set is.

The switching element and / or the further switching element, in particular the seventh switching element and / or the eighth switching element, is designed as a form-fitting switching element.

After actuation, ie closing, of the switching element, in particular the seventh switching element, or the further switching element, ie the eighth switching element, the components that are directly connected to one another in a rotationally fixed manner preferably always run at the same speed.

In the context of the present invention, for example, a claw shift element or a locking synchronization can be understood as a positive shift element. For example, the seventh switching element and / or the eighth switching element can each be a claw switching element, for example a claw clutch.

Positive-locking shifting elements can have the advantage over non-locking shifting elements that lower drag losses occur in the open state, so that a better efficiency of the transmission can be achieved. Form-fitting switching elements require less installation space and / or are more cost-effective. Two interlocking switching elements can be designed as a switching element pair with only one actuator.

By means of the planetary gear set, in particular the third planetary gear set, an additional hybrid forward gear, for example an OD gear, can be implemented, for example. A short axle ratio can be possible by means of the planetary gear set, in particular the third planetary gear set.

The switching element and the further switching element can form a first switching element pair, for example. For example, the seventh switching element and the eighth switching element can form a first switching element pair. The first pair of switching elements can be designed as a double claw, for example. For example, the switching element or the further switching element can be actuated via a single actuating element. For example, the switching element or the further switching element can be actuated from a neutral position by means of the actuating element. For example, the first switching element pair can simultaneously bring the switching element into the closed state and bring the further switching element into the open state and / or simultaneously bring the further switching element into the closed state and bring the switching element into the open state via exactly one actuating element.

The actuating element can for example be an actuator. By means of a single actuator, the seventh switching element can be opened and the eighth element closed, or vice versa, for example simultaneously or with a time delay, in particular via a neutral position, i.e. via a state in which both the seventh switching element and the eighth switching element are open. When using a first pair of switching elements, a number of elements, for example a number of actuating elements, in particular a number of actuators, can be reduced. This can save costs and / or weight. Furthermore, an advantage in terms of installation space can be achieved in this way.

For example, all of the shift elements of the transmission can be assembled into pairs of shift elements. As an alternative to this, the transmission can for example have at least one shift element that does not belong to a shift element pair. In the case of a switching element pair, one switching element on the one hand and the other switching element on the other hand can be actuated via exactly one actuating element, in particular from a neutral position. This can save costs and / or weight and / or installation space.

For example, all shift elements of the transmission can be positive shift elements. For example, the transmission can have further shift elements in addition to the seventh shift element and the eighth shift element. A configuration of switching elements as form-fitting switching elements can lead to low drag losses.

For example, the switching element and / or the further switching element, in particular the first switching element pair, can be actuated from a partition wall. For example, the seventh switching element and / or the eighth switching element and / or a further switching element, for example the second switching element, can be actuated from a partition between the housing. In particular, the first pair of switching elements can be connected non-rotatably to an intermediate housing wall or to a housing part of the transmission.

The transmission can have an electric machine. The electric machine can be, for example, a second electric machine, in particular an OD electric machine. The term “second” electric machine is to be understood as a pure designation and does not indicate that the transmission has other electrical machines. For example, the transmission can have a first electric machine. The electric machine, in particular the second electric machine, can, for example, have a drive connection with the first drive shaft of the basic gear set. The electric machine can be set up to enable purely electric driving, in particular using the basic gear set. Furthermore, the electric machine can be set up to enable hybridized driving, in particular via the basic gear set. The second electric machine can serve as a starter and / or as an alternator and / or as an electric driving machine.

The planetary gear set, in particular the third planetary gear set, can be arranged at least partially radially inside the electric machine. For example, the third planetary gear set can be arranged completely radially within the electric machine. This allows an advantage in terms of installation space to be achieved. In particular, an axially short design can be achieved in this way.

The electric machine, in particular the second electric machine, can be firmly connected to a shaft, in particular to the first drive shaft, of the basic gear set. In this way, for example, purely electric or hybrid driving can be achieved with bypassing the third planetary gear set. This can reduce drag losses. As an alternative to this, a clutch, for example, can be arranged between the second electric machine and the drive shaft of the basic gear set, in particular in order to optionally completely decouple the second electric machine from the basic gear set.

For example, with the shift element open and the further shift element open, in particular with the seventh shift element open and the eighth shift element open, purely electric driving may be possible, in particular by means of the electric machine, in particular by means of the second electric machine. For example, when the eighth shifting element and the seventh shifting element are in a neutral position, the third planetary gear set and the internal combustion engine can be decoupled from the first drive shaft of the basic gear set. This enables purely electric driving, in particular by means of the second electric machine. This can reduce pollutant emissions.

For example, a first element of the planetary gear set, in particular a first element of the third planetary gear set, can be connected non-rotatably to a non-rotatable component, in particular a first non-rotatable component. The first element of the planetary gear set, in particular the first element of the third planetary gear set, can be the planetary sun, for example. The non-rotatable component can, for example, be a housing part, in particular a gear housing and / or an intermediate housing wall.

The basic gear set can for example have at least two, in particular at least three, in particular at least four purely electrical gears. For example, the basic gear set can have at least two, in particular at least three, in particular at least four hybrid gears.

The expression “purely electrical” can be understood, for example, to mean that the internal combustion engine is decoupled, in particular that the shaft of the internal combustion engine does not rotate with it. This can reduce losses. For example, recuperation can also be carried out here.

The transmission can have a further electric machine, for example. The further electric machine can be a first electric machine, for example. The first electric machine can be set up to achieve an electric driving mode. The first electric machine can have a high gear ratio, in particular higher than the second electric machine. The first electric machine can be larger than the second electric machine. The further electric machine can, for example, be coupled or can be coupled to a second drive shaft of the basic gear set. The first electric machine can, for example, enable purely electric and / or hybrid driving by means of the basic gear set.

For example, the basic gear set can be arranged at least partially radially inside the first electric machine. As a result, the transmission can be built axially short.

The basic gear set can for example have a first planetary gear set and / or a second planetary gear set. The terms “first”, “second”, “third” are used in the context of the invention as pure designations and do not indicate any further elements that may be present. The first planetary gear set and / or the second planetary gear set can be configured, for example, like the third planetary gear set. The first planetary gear set and / or the second planetary gear set can be designed, for example, as a plus planetary gear set or as a minus planetary gear set.

The planetary gear sets, for example the first planetary gear set and / or the second planetary gear set and / or the third planetary gear set, can for example be arranged in the axial direction in the order of the third planetary gear set, first planetary gear set and second planetary gear set, in particular starting from an internal combustion engine end of the transmission. In this way, a modular structure can be achieved, in particular with an OD module and a basic gear set.

However, this sequence can also be at least partially reversed within the scope of the invention, so that, for example, the second planetary gear set initially follows the third planetary gear set and the first planetary gear set follows the second planetary gear set. For example, the third planetary gear set and / or the second planetary gear set and / or the first planetary gear set can be arranged coaxially to one another. This allows an advantage in terms of installation space to be achieved. The third planetary gear set can preferably be arranged at an end of the transmission on the internal combustion engine side.

The basic gear set can for example have a first drive shaft and / or a second drive shaft. For example, the first drive shaft can be configured to be coaxial with the second drive shaft. For example, the second drive shaft can be a hollow shaft. The first drive shaft can be a solid shaft.

Furthermore, the basic gear set can have an output shaft. For example, the output shaft can have a toothing via which the output shaft can be in operative connection with a differential gear arranged axially parallel to the output shaft. In this case, the toothing can be provided, for example, at a connection point on the output shaft. This connection point of the output shaft can be located axially in the area of one end of the basic gear set, in particular at an end that faces the third planetary gear set, in particular at one end of the basic gear set, at which a connection point of the first drive shaft is also provided, which connects to the upstream drive machine . This type of arrangement can be suitable, for example, for use in a motor vehicle with a drive train oriented transversely to the direction of travel of the motor vehicle. As an alternative to this, however, an output of the basic gear set can also be provided at an axial end of the transmission which is opposite to a connection point of the first drive shaft. Here, the drive and output of the basic gear set are placed at opposite axial ends of the basic gear set. A transmission designed in this way can be suitable for use in a motor vehicle with a drive train oriented in the direction of travel of the motor vehicle.

The basic gear set can have one or more switching elements. For example, the basic gear set can have a first and / or a second and / or a third and / or a fourth and / or a fifth shift element. In addition, the basic gear set can have a sixth shift element, for example. As a result, the basic gear set can have several shiftable gears. For example, all switching elements of the basic gear set can be designed with a positive fit. In particular, all the shift elements of the basic gear set can be designed as pairs of shift elements, in particular with an even number of shift elements.

For example, a rotor of the further electric machine, in particular of the first electric machine, can be connected to the second drive shaft, in particular to the second drive shaft of the basic gear set. A first element of the second planetary gear set, in particular a planetary gear sun, can be fixed to a rotationally fixed component, for example to a second rotationally fixed component, via the first switching element. A first element of the first planetary gear set, in particular a planetary gear set, can be fixed to a third rotationally fixed component via the second switching element. The first non-rotatable component and / or the second non-rotatable component and / or the third non-rotatable component can for example be identical, for example designed as a gear housing.

For example, the first drive shaft can be connected to the output shaft in a rotationally fixed manner via the third switching element. The first drive shaft can, for example, be non-rotatably connectable to the first element of the first planetary gear set, in particular to the sun of the first planetary gear set, via the fourth shift element.

For example, the first drive shaft can be connected non-rotatably to the second drive shaft via the fifth shift element. For example, the output shaft can be non-rotatably connected both to a third element of the first planetary gear set, in particular a ring gear of the first planetary gear set, and to a second element of the second planetary gear set, in particular a planetary web of the second planetary gear set. In particular, the second drive shaft can be non-rotatably connected both to a second element of the first planetary gear set and to a third element of the second planetary gear set.

For example, each of the planetary gear sets, in particular the first planetary gear set, the second planetary gear set and the third planetary gear set, can be assigned a first element, a second element and a third element. The first element can for example be a planetary sun. The second element can for example be a planet carrier. The third element can be a ring gear, for example. Alternatively, a second element can be a ring gear and a third element can be a planet carrier.

By selectively actuating the first switching element and / or the second switching element and / or the third switching element and / or the fourth switching element and / or the fifth switching element and / or the sixth switching element and / or the seventh switching element and / or the eighth switching element can different power flow guides and / or different gears can be realized. For example, at least four different gears between the first drive shaft and the output shaft can be formed by the transmission ratio by means of the basic gear set.

For example, a rotor of the first electric machine can be connected to the second drive shaft. The third, fourth and fifth shifting elements can be present, for example, as clutches which, when actuated, can adjust the rotational movements of the components of the transmission to be connected and then connect them to one another in a rotationally fixed manner. The shifting element to be shifted during a shift can be synchronized by an internal combustion engine speed control or by synchronized shifting elements or by another central synchronization, such as a transmission brake or another electric machine, for example the second electric machine.

For example, a separating clutch can be provided for the internal combustion engine, in particular the second switching element can serve for this purpose, in particular to decouple an inertial mass of the internal combustion engine during synchronization. To support the synchronization, a further electric machine can optionally be used, which is directly or indirectly operatively connected to the drive shaft, for example the second electric machine. The first switching element and / or the second switching element can be present as brakes, for example.

For example, a respective non-rotatable connection of rotatable components of the transmission can be implemented via one or more intermediate shafts, which can also be present as short intermediate pieces when the components are spatially close together. For example, the components can each be present either as individual components that are non-rotatably connected to one another or also as one piece. In the case of components of the transmission that can be connected to one another by actuating a respective shift element, a connection can also be implemented, for example, via one or more intermediate shafts.

It can be locked in place by non-rotatably connected to a non-rotatable component of the gearbox, which is preferably a permanently stationary component, preferably a housing of the gearbox, part of such a housing or a non-rotatably connected component.

A connection between the rotor of the first electric machine and the second drive shaft of the basic gear set can be understood to mean a connection between the latter such that a constant speed dependency prevails between the rotor of the first electric machine and the second drive shaft. Here, the first electric machine can be arranged either coaxially to the planetary gear sets or axially offset relative to them, for example axially offset to the first planetary gear set and / or to the second planetary gear set. In the case of a first electric machine that is axially offset from the first planetary gear set and / or the second planetary gear set, a coupling can take place via one or more intermediate transmission stages and / or a traction drive. The one or more translation stages can also be implemented individually either as a spur gear stage or as a planetary stage. A traction mechanism drive can be, for example, a belt drive or a chain drive.

The transmission can be characterized in particular by a compact design and / or low component loads and / or good gear efficiency and / or low losses.

Due to the connection of the first electric machine to the second drive shaft of the basic gear set, different operating modes can be implemented in a simple manner. An electrodynamic start-up (EDA mode), for example, can be implemented by means of the basic wheel set. Electrodynamic start-up means that the speed of the internal combustion engine, the speed of the first electric machine and the speed of the output shaft are superimposed over one or more planetary gear sets so that starting from standstill with the internal combustion engine running is possible.

For example, a power shift of electrical gears for the first electric machine can be supported via the second electric machine. For example, further gears, in particular the short gears, can be started from a first electric gear. To start long internal combustion engine gears, for example, a start can be made via the third planetary gear set.

This allows a favorable translation of the second electric machine for one Internal combustion engine start, in particular with a closed seventh shift element and a neutral position of the basic gear set with respect to the first drive shaft, for example with an open third shift element and open fourth shift element and open fifth shift element and open sixth shift element.

For example, the transmission can enable serial operation at a low internal combustion engine speed, especially when the eighth shift element is closed and the shift elements of the basic gear set are in a neutral position with respect to the first drive shaft, i.e., for example, an open third shift element and an open fourth shift element and an open fifth shift element and an open sixth shift element . In the case of serial operation, the electrical supply for the second electric machine can come from the first electric machine.

The transmission can be designed, for example, to perform a start-up with the third planetary gear set. The basic gear set can have a purely electric main gear for the first electric machine, for example if only the first switching element on the basic gear set is closed. The basic gear set gears can be used from this gear 1 , 2 and 3 be started, for example by closing the third switching element or the fourth switching element or the fifth switching element. A fourth gear of the basic gear set cannot be started directly, for example, since the first shift element would first have to be opened and the second shift element closed.

For example, the internal combustion engine can be started with the second electric machine when the eighth shift element is closed, especially if this has not yet happened, and then the third gear of the basic gear set can be synchronized and engaged, in particular the third shift element can be synchronized and closed. As a result, a gear ratio similar to the fourth gear in the basic gear set can be available for the internal combustion engine, since the third planetary gear set represents a pre-gear ratio to high speed. As a result, the internal combustion engine can also be coupled in a “short” electrical gear, for example when the first shift element is closed, at low speeds as a forward drive.

The transmission can, for example, be a hybrid transmission with an upstream overdrive (OD) group. The OD group can include, for example, the third planetary gear set and / or the second electric machine and / or the seventh shifting element and / or the eighth shifting element. The transmission can, for example, implement a Dedicated Hybrid Transmission EDA (DHT) concept.

By means of the planetary gear set upstream of the basic gear set, in particular the third planetary gear set, at least one additional “long” gear can be generated for the internal combustion engine, which can be referred to as “overdrive”. A “long” gear means a low gear ratio from input to output. This is advantageous for higher driving speeds, because an internal combustion engine speed can be reduced with such an additional gear. This can result in a consumption advantage.

By means of the upstream third planetary gear set, higher realizable axle torques can be realized for the first electric machine of the basic gear set. With the third planetary gear set, the transmission can have a shiftable upstream group which, on the one hand, can be bridged or bypassed by the shifting element, in particular the seventh shifting element (gear ratio = 1), and, on the other hand, the further shifting element, in particular the eighth shifting element, can be converted into "Fast" (overdrive) can be realized (translation <1).

By means of the upstream third planetary gear set, a transmission with 5 gears can be realized, for example, from a basic gear set with 4 gears. A planetary gear set as an OD group can be advantageous in terms of saving installation space, for example because the planetary gear set can be arranged coaxially and / or within the electric machine.

The transmission can be a hybrid transmission, in particular a hybrid transmission with an upstream overdrive (OD) group.

Another aspect of the present invention relates to a motor vehicle drive train, in particular for a hybrid or electric vehicle. The motor vehicle drive train comprises a transmission as described above.

The motor vehicle drive train can have the internal combustion engine. The planetary gear set, in particular the third planetary gear set, and / or the further electric machine, in particular the second electric machine, can be arranged between the internal combustion engine and the basic gear set.

The motor vehicle drive train can have a torsional vibration damper, for example. The motor vehicle drive train can for example have a differential gear. The transmission can be between the internal combustion engine and further components of the drive train which follow in the direction of force flow to the drive wheels of the motor vehicle. For example, the input shaft of the transmission can be permanently non-rotatably connected to a crankshaft of the internal combustion engine or can be connected via an intermediate separating clutch, with the torsional vibration damper being provided between the internal combustion engine and the transmission.

On the output side, the transmission can be coupled within the motor vehicle drive train to a differential transmission of a drive axle of the motor vehicle. For example, there can be a connection to a center differential via which the torque can be distributed to several driven axles of the motor vehicle. The differential gear or the longitudinal differential can be arranged with the gear in a common housing. As an alternative or in addition, a torsional vibration damper that may be present can be arranged within this housing.

It goes without saying that the features mentioned above and those yet to be explained below can be used not only in the respectively specified combination, but also in other combinations or alone, without departing from the scope of the present invention.

• 1 eine schematische Darstellung eines ersten Ausführungsbeispiels des neuen Getriebes;
• 2A eine schematische Darstellung eines zweiten Ausführungsbeispiels des neuen Getriebes;
• 2B eine Schaltmatrix des Basisradsatzes des zweiten Ausführungsbeispiels des neuen Getriebes;
• 2C eine Schaltmatrix für elektrische Gänge und EDA-Modi des Basisradsatzes des zweiten Ausführungsbeispiels des neuen Getriebes;
• 2D eine Schaltmatrix für rein verbrennungsmotorische Gänge des Basisradsatzes des zweiten Ausführungsbeispiels des neuen Getriebes; und
• 3 eine schematische Darstellung eines Ausführungsbeispiels des neuen Kraftfahrzeugantriebsstrangs.

Exemplary embodiments of the invention are shown in the drawing and are explained in more detail in the following description. Show it:

• 1 a schematic representation of a first embodiment of the new transmission;
• 2A a schematic representation of a second embodiment of the new transmission;
• 2 B a shift matrix of the basic gear set of the second exemplary embodiment of the new transmission;
• 2C a switching matrix for electrical gears and EDA modes of the basic gear set of the second exemplary embodiment of the new transmission;
• 2D a shift matrix for purely internal combustion engine gears of the basic gear set of the second embodiment of the new transmission; and
• 3 a schematic representation of an embodiment of the new motor vehicle drive train.

In the 1 and 2A are exemplary embodiments for the new transmission 10 for a motor vehicle 40 shown. The gear 10 has a basic wheel set 50 , a first input member 11 , a second input link 12 , a switching element 26th , for example also as a seventh switching element 26th denotes, and another switching element 28 , for example also as the eighth switching element 28 referred to. The switching element 26th is set up in such a way that the switching element is in a closed state 26th the first input link 11 with the basic wheelset 50 connected is. The further switching element 28 is set up such that in a closed state of the further switching element 28 the second input link 12 with the basic wheelset 50 connected is. The first input link 11 is via a planetary gear set 18th , which, for example, as a third planetary gear set 18th can be designated with the second input element 12 coupled. The switching element 26th and / or the further switching element 28 are designed as a form-fitting switching element.

The in 1 and 2A illustrated embodiments of the new transmission 10 is an input shaft 24 with an internal combustion engine 22nd connected or connectable. The third planetary gear set 18th has a first element 131 of the third planetary gear set 18th , a second element 132 of the third planetary gear set 18th and a third element 133 of the third planetary gear set 18th on. The input shaft 24 rotates with the second element 132 of the third planetary gear set 18th connected. The first element 131 of the third planetary gear set 18th is a sun gear. The second element 132 of the third planetary gear set 18th is a planetary bridge. The third element 133 of the third planetary gear set 18th is a ring gear. The input shaft 24 rotates with the second element 132 of the third planetary gear set 18th connected. The first element 131 of the third planetary gear set 18th is non-rotatable with a first non-rotatable component 20th connected, for example with a housing part of the transmission 10 .

The switching element 26th and the further switching element 28 form a first pair of switching elements 29 . The switching element 26th or the further switching element 28 can be actuated from a neutral position via an actuating element, in particular via precisely one actuator.

All switching elements 26th , 28 , 61 , 62 , 63 , 64 , 65 , 66 of the in 2A illustrated new transmission 10 are designed as positive switching elements.

The ones in the 1 and 2A illustrated embodiments of the new transmission 10 each have an electric machine 16 on, for example as a second electric machine 16 designated.

The third planetary gear set 18th is inside the second electric machine 16 arranged. The second electric machine 16 is non-rotatable with a shaft 52 , especially with the first drive shaft 52 , of the basic wheelset 50 connected. With the seventh switching element closed 26th can the third planetary gear set 18th be bypassed. With the eighth switching element closed 28 is the input shaft 24 via the third planetary gear set 18th with the first drive shaft 52 of the basic wheelset 50 connected.

With the switching element open 26th and with the further switching element open 28 purely electric driving is possible.

The third planetary gear set 18th is in the axial direction between the internal combustion engine 22nd and the basic wheelset 50 arranged or placeable. The switching element 26th and the further switching element 28 are in the axial direction between the third planetary gear set 18th and the basic wheelset 50 arranged. The further switching element 28 is in the axial direction between the third planetary gear set 18th and the switching element 26th arranged. The switching element 26th is in the axial direction between the further switching element 28 and the basic wheelset 50 arranged.

The gear 10 has another electric machine 14th on, which was also the first electric machine 14th referred to as. The first electric machine 14th can in particular on the basic wheelset 50 be arranged. The basic wheelset 50 can, as in the embodiment according to 2A shown, a first planetary gear set 58 and a second planetary gear set 60 exhibit. The basic wheelset 50 can at least partially, preferably completely, radially within the first electric machine 14th be arranged.

The in 2A shown basic wheelset 50 has a first drive shaft 52 , a second drive shaft 54 and an output shaft 56 on. The first planetary gear set 58 has a first element 111 , preferably a sun gear, a second element 112 , preferably a planetary web, and a third element 113 , preferably a ring gear. The second planetary gear set 60 has a first element 121 , preferably a sun gear, a second element 122 , preferably a planetary web, and a third element 123 , preferably a ring gear. The basic wheelset 50 has a first 61, a second 62, a third 63, a fourth 64, a fifth 65 and a sixth switching element 66 on.

One rotor 70 the other electric machine 14th stands with the second drive shaft 54 in connection. The first element 121 of the second planetary gear set 60 is via the first switching element 61 on a further non-rotatable component, for example a second non-rotatable component 72 , determinable. The second non-rotatable component 72 can for example be identical to the first rotationally fixed component 20th his. The first element 111 of the first planetary gear set 58 is via the second switching element 62 on the third rotationally fixed component 73 determinable. The first drive shaft 52 is via the third switching element 63 with the output shaft 56 non-rotatable. The first drive shaft 52 is via the fourth switching element 64 with the first element 111 of the first planetary gear set 58 non-rotatable. The first drive shaft 52 is via the fifth switching element 65 with the second drive shaft 54 non-rotatable. The output shaft 56 is both with the third element 113 of the first planetary gear set 58 as well as with the second element 122 of the second planetary gear set 60 non-rotatably connected. The second drive shaft 54 is with both the second element 112 of the first planetary gear set 58 as well as with the third element 123 of the second planetary gear set 60 non-rotatably connected.

The first planetary gear set 58 is in the axial direction between the third planetary gear set 18th and the second planetary gear set 60 arranged. In particular is the first planetary gear set 58 between the first pair of switching elements 29 and the second planetary gear set 60 arranged. The second switching element 62 is designed as a brake.

With the second switching element closed 62 is the first element 111 , especially the sun of the first planetary gear set 58 , on the third rotationally fixed component 73 fixed. The fourth switching element 64 is between the first planetary gear set 58 and the fifth switching element 65 arranged. The fifth switching element 65 and the third switching element 63 form a pair of switching elements. The sixth switching element 66 is between the third switching element 63 and the second planetary gear set 60 arranged. The first switching element 61 is behind the second planetary gear set in the axial direction 60 at one end of the transmission 10 arranged. With the first switching element closed 61 a non-rotatable connection to the gear housing can be achieved in this way.

In the 2 B , 2C and 2D are switching matrices of the basic wheelset 50 shown. The shifting elements of the basic gear set are shown in each case 50 , in particular the first switching element 61 , the second switching element 62 , the third switching element 63 , the fourth switching element 64 , the fifth switching element 65 and the sixth switching element 66 , opposite a gear name. The sign “x” indicates that the respective shift element is actuated, ie closed, in the respective gear. 2 B shows a switching matrix for hybrid gears of the basic gear set 50 . 2C shows a switching matrix for electrical gears and EDA modes of the basic gear set 50 and 2D shows a switching matrix for purely internal combustion engine gears with decoupled first electric machine 14th of the basic wheelset 50 . The ones in the 2 B , 2C and 2D The shift matrices shown show the gears of the transmission 10 when the seventh switching element is closed 26th and opened eighth switching element 28 , i.e. when bypassing the third planetary gear set 18th , i.e. bypassing the overdrive gear set.

Corresponding 2 B can by bypassing the third planetary gear set 18th a first hybrid gear H1 by closing the first switching element 61 and closing the fourth switching element 64 can be achieved. A second hybrid gear H2 can by closing the first switching element 61 and closing the fifth switching element 65 can be achieved. A closing of the switching elements 61 and 63 results in the hybrid gait H3 .1. The hybrid gear H3 .2 can by closing the second switching element 62 and closing the third switching element 63 can be achieved. The other hybrid gears as well as the purely electric gears and the purely combustion engine gears of the basic gear set 50 can 2 B , 2C and 2D be taken in a corresponding manner.

The basic wheelset 50 can have at least three all-electric gears. The basic wheelset 50 have at least three hybrid gears.

3 shows an embodiment of the new motor vehicle drive train 30th , especially for a hybrid or an electric vehicle. The new automotive powertrain 30th has a transmission 10 as described above. The automotive powertrain 30th has an internal combustion engine 22nd on. Between the internal combustion engine 22nd and the new gearbox 10 is a torsional vibration damper 38 arranged. Between the gearbox 10 and the drive wheels 32 is a differential gear 36 arranged. 3 particularly shows schematically a motor vehicle 40 . The planetary gear set 18th is between the internal combustion engine 22nd and the basic wheelset 50 arranged.

List of reference symbols

10

transmission

11

first input link

12

second input link

14th

another electric machine, first electric machine

16

Electric machine, second electric machine

18th

Planetary gear set, third planetary gear set

20th

non-rotatable component, first non-rotatable component

22nd

Internal combustion engine

24

Input shaft

26th

Switching element, seventh switching element

28

further switching element, eighth switching element

29

first pair of switching elements

30th

Automotive powertrain

32

drive wheel

36

Differential gear

38

Torsional vibration damper

40

Motor vehicle

50

Basic wheelset

52

first drive shaft

54

second drive shaft

56

Output shaft

58

first planetary gear set

60

second planetary gear set

61

first switching element

62

second switching element

63

third switching element

64

fourth switching element

65

fifth switching element

66

sixth switching element

70

rotor

72

second non-rotatable component

73

third non-rotatable component

111

first element of the first planetary gear set

112

second element of the first planetary gear set

113

third element of the first planetary gear set

121

first element of the second planetary gear set

122

second element of the second planetary gear set

123

third element of the second planetary gear set

131

first element of the third planetary gear set

132

second element of the third planetary gear set

133

third element of the third planetary gear set

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• US 9114699 B2 [0002]

Claims (15)

Transmission (10) for a motor vehicle (40), the transmission (10) having a basic gear set (50), a first input element (11), a second input element (12), a shift element (26) and a further shift element (28) , wherein the switching element (26) is set up such that in a closed state of the switching element (26) the first input member (11) is connected to the basic gear set (50), the further switching element (28) being set up in such a way that in a the second input member (12) is connected to the basic gear set (50) in the closed state of the further switching element (28), the first input member (11) being coupled to the second input member (12) via a planetary gear set (18), the switching element ( 26) and / or the further switching element (28) is designed as a form-fitting switching element. Gearbox after Claim 1 , wherein the switching element (26) and the further switching element (28) form a first switching element pair (29), wherein the switching element (26) or the further switching element (28) can be actuated via an actuating element. Gearbox according to one of the Claims 1 to 2 , wherein all shift elements (26, 28, 61, 62, 63, 64, 65, 66) of the transmission (10) are positive shift elements. Gearbox according to one of the Claims 1 to 3 , wherein the transmission (10) has an electric machine (16). Gearbox after Claim 4 , wherein the planetary gear set (18) is arranged at least partially radially inside the electric machine (16). Gearbox according to one of the Claims 4 to 5 , wherein the electric machine (16) is non-rotatably connected to a shaft (52) of the basic gear set (50). Gearbox according to one of the Claims 1 to 6th With the switching element (26) open and the further switching element (28) open, purely electric driving is possible. Gearbox according to one of the Claims 1 to 7th , wherein a first element (131) of the planetary gear set (18) is non-rotatably connected to a non-rotatable component (20). Gearbox according to one of the Claims 1 to 8th , wherein a second element (132) of the planetary gear set (18) is rotatably connected to an input shaft (24). Gearbox according to one of the Claims 1 to 9 , wherein the basic gear set (50) has at least three purely electrical gears, the basic gear set (50) having at least three hybrid gears. Gearbox according to one of the Claims 1 to 10 , wherein the transmission (10) has a further electric machine (14). Gearbox according to one of the Claims 1 to 11 , wherein the basic gear set (50) has a first planetary gear set (58) and / or a second planetary gear set (60). Transmission according to the Claims 11 and 12 , wherein the basic gear set (50) has a first drive shaft (52), a second drive shaft (54) and an output shaft (56), the basic gear set (50) having a first (61), a second (62), a third (63 ), a fourth (64) and a fifth switching element (65), a rotor (70) of the further electric machine (14) being connected to the second drive shaft (54), a first element (121) of the second planetary gear set ( 60) can be fixed to a second rotationally fixed component (72) via the first switching element (61), a first element (111) of the first planetary gear set (58) being able to be fixed to a third rotationally fixed component (73) via the second switching element (62) , wherein the first drive shaft (52) can be connected in a rotationally fixed manner to the output shaft (56) via the third shift element (63), the first drive shaft (52) via the fourth shift element (64) to the first element (111) of the first planetary gear set ( 58) is rotatably connectable, the first e drive shaft (52) can be connected non-rotatably to the second drive shaft (54) via the fifth shift element (65), the output shaft (56) being connected both to a third element (113) of the first planetary gear set (58) and to a second element ( 122) of the second planetary gear set (60) is non-rotatably connected, the second drive shaft (54) being non-rotatably connected to both a second element (112) of the first planetary gear set (58) and a third element (123) of the second planetary gear set (60) is. Motor vehicle drive train, in particular for a hybrid or electric vehicle, comprising a transmission (10) according to one of the Claims 1 to 13 . Motor vehicle drive train according to Claim 14 wherein the motor vehicle drive train (30) has an internal combustion engine (22), the planetary gear set (18) being arranged between the internal combustion engine (22) and the basic gear set (50).

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