Hybrid drive system for a motor vehicle and motor vehicle

Abstract

The invention relates to a hybrid drive system (10) for a motor vehicle, comprising an internal combustion engine (16) which has a drive shaft (18) via which first drive torques can be provided from the internal combustion engine (16) to drive the motor vehicle, an electric machine (20) which has a rotor (24) via which second drive torques can be provided from the electric machine (20) to drive the motor vehicle, an axle drive (34) and a transmission (38) comprising a first sub-transmission (40) and a second sub-transmission (42), wherein the first sub-transmission (40) comprises a first planetary gear set (44) with a first sun gear (46), a first planet carrier (48) and a first ring gear (50), and a second planetary gear set (54) with a second sun gear (56), a second planet carrier (58) and a second ring gear (60).

Description

[0001] The invention relates to a hybrid drive system for a motor vehicle, in particular for a motor vehicle, according to the preamble of patent claim 1. Furthermore, the invention relates to a motor vehicle, in particular a motor vehicle, with such a hybrid drive system.

[0002] DE 10 2022 001 147 B3 discloses a hybrid drive system for a motor vehicle, with an internal combustion engine and with an electric machine.

[0003] The object of the present invention is to provide a hybrid drive system for a motor vehicle and a motor vehicle with such a hybrid drive system, so that a particularly advantageous drive can be realized in a particularly space-saving manner.

[0004] This object is achieved by a hybrid drive system having the features of patent claim 1 and by a motor vehicle having the features of patent claim 8. Advantageous embodiments with expedient further developments of the invention are specified in the remaining claims.

[0005] A first aspect of the invention relates to a hybrid drive system, also referred to as a hybrid drive device or hybrid drive unit, or embodied as a hybrid drive device or hybrid drive apparatus, for a motor vehicle, also simply referred to as a vehicle. This means that the motor vehicle, preferably embodied as a motor vehicle, in particular as a passenger car, in its fully manufactured state has the hybrid drive system and can be driven by means of the hybrid drive system. The hybrid drive system has an internal combustion engine, also referred to as an internal combustion engine or combustion machine, which is also simply referred to as an engine and has a drive shaft. For example, the internal combustion engine is embodied as a reciprocating piston engine, thus as a reciprocating piston machine, so that very particularly the drive shaft can be embodied as a crankshaft.The internal combustion engine can provide first drive torques for driving the motor vehicle via the drive shaft. The first drive torques are first torques for driving the motor vehicle. The hybrid drive system also comprises an electric machine having a rotor. For example, the electric machine has a stator, by means of which the rotor can be driven and is thus rotatable about a machine axis of rotation relative to the stator. The electric machine can provide second drive torques for driving the motor vehicle via the rotor. The second drive torques are second torques for driving the motor vehicle. For example, in its fully manufactured state, the motor vehicle has at least or exactly two vehicle axles arranged consecutively and thus one behind the other in the longitudinal direction of the motor vehicle, also simply referred to as axles.The respective vehicle axle has at least or exactly two vehicle wheels, also simply referred to as wheels, wherein the vehicle wheels of the respective vehicle axle are arranged on opposite sides of the motor vehicle in the transverse direction of the motor vehicle. The respective vehicle wheel is a ground contact element of the motor vehicle. The motor vehicle can be or is supported downwards on a ground in the vertical direction of the motor vehicle via the ground contact elements. If the motor vehicle is driven along the ground and is propelled in particular by means of the hybrid drive system while the motor vehicle is supported downwards on the ground in the vertical direction of the motor vehicle via the ground contact elements, the ground contact elements roll, in particular directly, on the ground.For example, the hybrid drive system is assigned, in particular precisely, to one of the vehicle axles, so that, for example, the vehicle wheels of the vehicle axle to which the hybrid drive system is assigned can be driven by means of the hybrid drive system. It is thus conceivable that the combustion engine, via its drive shaft, and the electric motor, via its rotor, can drive the same vehicle wheels of the vehicle axle to which the hybrid drive system is assigned. The motor vehicle can be driven by driving the vehicle wheels. The vehicle wheels that can be driven by means of the hybrid drive system, i.e., by means of the combustion engine and the electric motor, are also referred to as drivable or driven wheels, or as drive wheels.When reference is made below to the wheels or the vehicle wheels, unless otherwise stated, this refers to the wheels of the vehicle axle that can be driven by the hybrid drive system and to which the hybrid drive system is assigned.

[0006] The hybrid drive system has an axle drive, also referred to as a differential or differential gear, which is in particular assigned to the vehicle axle to which the hybrid drive system is assigned. In particular, the vehicle wheels can be driven by the combustion engine and the electric motor via the axle drive. Very particularly, the axle drive is a differential gear, also simply referred to as a differential, which in particular has the function, sufficiently known from the general prior art, that a respective third torque can be distributed to the vehicle wheels via the axle drive, so that the vehicle wheels can be driven via the axle drive by means of the respective third torque. For example, the respective third torque results from the respective first drive torque and / or from the respective second drive torque.In particular, the axle drive allows different speeds of the vehicle wheels, for example when the motor vehicle is cornering, so that, for example, the vehicle wheel on the outside of the curve can rotate at a higher speed than the vehicle wheel on the inside of the curve, in particular while the vehicle wheels can be or are driven via the axle drive by means of the third torque or by the combustion engine and / or the electric machine. The axle drive has an axle drive input gear via which the axle drive can be driven, in particular in such a way that the respective third torque can be introduced into the axle drive or transmitted to the axle drive via the axle drive input gear. The axle drive input gear is a first gear of the hybrid drive system and is therefore also referred to as an axle drive input gear. For example, the axle drive input gear can be designed as a ring gear.The axle drive can be designed as a bevel gear differential or as a planetary gear differential or as another differential gear.

[0007] The hybrid drive system also has a transmission, also referred to as the main transmission and provided in particular in addition to the axle transmission, which has a first sub-transmission and a second sub-transmission. In particular, it is conceivable for the axle transmission to be driven by the combustion engine and the electric motor via the transmission, so that, for example, the transmission can provide the respective third torque, or the transmission can, for example, provide a respective fourth torque, from which, for example, the respective third torque results. It is conceivable for the respective fourth torque to result from the respective first drive torque and / or from the respective second drive torque.

[0008] The first sub-transmission has a first planetary gear set, which is also simply referred to as the first planetary gear set. The first planetary gear set has a first sun gear, a first planet carrier, which is also referred to as the first web, and a first ring gear. The first sun gear, the first planet carrier and the first ring gear are also referred to as planetary gear set elements of the first planetary gear set, thus the first sun gear, the first planet carrier and the first ring gear are planetary gear set elements of the first planetary gear set. The first sub-transmission also has a second planetary gear set, which is provided in particular in addition to the first planetary gear set and is also simply referred to as the second planetary gear set. The second planetary gear set has a second sun gear, a second planet carrier, which is also referred to as the second web, and a second ring gear.The second sun gear, the second planet carrier and the second ring gear are also referred to as transmission elements of the second planetary gear set or are transmission elements of the second planetary gear set.

[0009] In particular, the hybrid drive system has a housing, wherein it is conceivable that the first planetary gear set and / or the second planetary gear set are each arranged at least partially, in particular at least predominantly and thus at least more than half or entirely, in the housing. For example, if the respective planetary gear set element is not connected to the housing in a rotationally fixed manner, the respective planetary gear set element can be rotated about a first planetary gear set axis of rotation relative to the housing, in particular by driving the first planetary gear set. Furthermore, it is conceivable that, in particular if the respective transmission element is not connected to the housing in a rotationally fixed manner, the respective transmission element can be rotated about a second planetary gear set axis of rotation relative to the housing, in particular by driving the second planetary gear set.In particular, it can be provided that the planetary gear sets are arranged coaxially to one another so that the planetary gear set rotation axes coincide.

[0010] The first sun gear is permanently connected to the second planet carrier in a rotationally fixed manner.

[0011] The second sub-transmission has a first spur gear stage, in particular a switchable one, a second spur gear stage, in particular a switchable one, provided in addition to the first spur gear stage, and a first output shaft, in particular a switchable one, provided in addition to the drive shaft. The first spur gear stage has a first input gear and a first output gear that meshes, in particular permanently, with the first input gear. The first input gear is a second gear of the hybrid drive system, the axial direction of which coincides with the machine axis of rotation or runs parallel to the machine axis of rotation. In particular, the rotor is rotatable about the machine axis of rotation relative to the housing. For example, the drive shaft is rotatable about a drive shaft axis of rotation relative to the housing.It is conceivable for the combustion engine and the electric machine to be arranged coaxially to one another, so that the drive shaft axis of rotation coincides with the machine axis of rotation. Thus, for example, the drive shaft axis of rotation and the machine axis of rotation coincide with a main axis of rotation of the hybrid drive system, the radial direction of which runs perpendicular to the axial direction of the hybrid drive system. In particular, the axial direction of the hybrid drive system coincides with the main axis of rotation. The first output gear is arranged coaxially to the first output shaft. The first output gear is arranged, for example, on the first output shaft. The first output shaft can be driven, for example, by the first output gear. In principle, it would be conceivable for the first output gear to be connected, in particular permanently, in a rotationally fixed manner to the first output shaft. The first input gear is or can be connected in a rotationally fixed manner to the first ring gear.In other words, it is conceivable that the first input gear is connected, in particular permanently, to the first ring gear in a rotationally fixed manner. Furthermore, it is conceivable that the first input gear is rotationally fixed to the first ring gear. The first output gear is a third gear of the hybrid drive system.

[0012] The second, in particular switchable, spur gear stage has a second input gear and a second output gear that meshes, in particular permanently, with the second input gear. The second input gear is, for example, a fourth gear of the hybrid drive system, and the second output gear is, for example, a fifth gear of the hybrid drive system. The second output gear is, for example, arranged coaxially with the first output shaft. For example, the first output shaft can be driven by the first output gear. For example, the first output shaft can be driven by the second output gear. The second output gear is, for example, arranged on the first output shaft. In principle, it would be conceivable for the second output gear to be connected, in particular permanently, in a rotationally fixed manner to the first output shaft. For example, the first output gear can be connected in a rotationally fixed manner to the first output shaft.For example, the second output gear is rotationally fixed to the first output shaft. The second input gear is or can be rotationally fixed to the second planet carrier. In other words, the second input gear is, for example, permanently connected to the second planet carrier. Furthermore, it is conceivable for the second input gear to be rotationally fixed to the second planet carrier.

[0013] The hybrid drive system also has a first output gear, which is, for example, a sixth gear of the hybrid drive system. The first output gear is permanently connected to the first output shaft in a rotationally fixed manner. The first output gear permanently meshes with the axle drive input gear of the axle drive, so that the axle drive input gear and, via the axle drive input gear, the axle drive can be driven by the first output gear. In particular, the first output gear, the first output gear, the second output gear, and the first output shaft are all arranged coaxially with one another.The first output shaft is rotatable, for example, relative to the housing about a first output shaft axis of rotation, wherein, for example, the first output shaft axis of rotation runs parallel to the machine axis of rotation and parallel to the drive shaft axis of rotation and parallel to the first planetary gear set axis of rotation and parallel to the second planetary gear set axis of rotation and is spaced apart from the drive shaft axis of rotation, the machine axis of rotation, the first planetary gear set axis of rotation, and the second planetary gear set axis of rotation. In particular, it is conceivable that the first planetary gear set, the second planetary gear set, the internal combustion engine and thus the drive shaft and the electric machine and thus the rotor are all arranged coaxially with one another, so that the first planetary gear set axis of rotation, the second planetary gear set axis of rotation, the drive shaft axis of rotation, and the machine axis of rotation coincide and all coincide with the main axis of rotation.Thus, the first output shaft rotation axis is preferably spaced from the main rotation axis, wherein the first output shaft rotation axis preferably runs parallel to the main rotation axis.

[0014] The hybrid drive system has a first switching element by means of which the drive shaft of the combustion engine can be connected in a rotationally fixed manner to the first planetary carrier. This means that the first switching element can be switched between a first coupled state and a first uncoupled state. In the first coupled state, the drive shaft is connected in a rotationally fixed manner to the first planetary carrier by means of the first switching element. In the first uncoupled state, the drive shaft and the first planetary carrier are decoupled from one another, so that the drive shaft and the first planetary carrier can rotate relative to one another about the main axis of rotation.

[0015] The hybrid drive system also has a second switching element, by means of which the drive shaft is rotationally fixedly connected to the second sun gear. This means that the second switching element can be switched between a second coupling state and a second decoupling state. In the second coupling state, the drive shaft is rotationally fixedly connected to the second sun gear by means of the second switching element. In the second decoupling state, the drive shaft and the second sun gear are decoupled from one another, so that the drive shaft and the second sun gear are rotatable relative to one another about the main axis of rotation.

[0016] The rotor of the electric machine is coupled or can be coupled to the second sun gear in a torque-transmitting manner, in particular in a rotationally fixed manner, such that the respective second drive torque provided or can be provided by the electric machine via the rotor can be introduced into the transmission at the second sun gear, thus the respective second drive torque provided or can be provided by the electric machine via the rotor can be transmitted from the rotor to the second sun gear and can thus be introduced into the transmission via the second sun gear, in particular in order to drive the transmission.The feature that two gears, such as the first output gear and the axle drive input gear, permanently mesh with each other, and are therefore permanently engaged with each other, means that the permanently meshing gears are not movable relative to each other between a meshing position in which the gears mesh with each other, and a released position in which the gears do not mesh with each other, but the permanently meshing gears are permanently, i.e. always engaged with each other.

[0017] In order to be able to realize a particularly advantageous drive and thus a particularly advantageous drivability of the hybrid drive system and thus of the motor vehicle in a particularly space-saving manner, it is provided according to the invention that the first planet carrier is permanently connected in a rotationally fixed manner to the second ring gear.

[0018] In the context of the present disclosure, the feature "radially overlapping" is to be understood as follows: Two elements, in particular at least substantially rotationally symmetrical, are arranged radially, in particular overlapping one another, in particular with respect to a common axis running, for example, in the radial direction of the hybrid drive system and / or in the radial direction of the hybrid drive system, if they are each arranged at least partially in a region of the same radial coordinates, in particular the same angular coordinates. The term "radial" refers to the radial direction of the hybrid drive system. In other words, the term "radial" means the radial direction of the hybrid drive system, whose radial direction runs perpendicular to the axial direction of the hybrid drive system.When reference is made to the radial direction above and below, this refers to the radial direction of the hybrid drive system, unless otherwise stated.

[0019] The feature "axially overlapping" is to be understood as follows: Two elements are arranged axially overlapping, in particular with respect to one another, with respect to a common axis running in particular in the axial direction of the hybrid drive system, such as the main axis of rotation and / or in the axial direction of the hybrid drive system, if they are each arranged at least partially in a region of the same axial coordinates. In the context of the present disclosure, the term "axial" is to be understood as the axial direction of the hybrid drive system. In other words, the term "axial" means the axial direction of the hybrid drive system. Expressed again in other words, "axial" refers to the axial direction of the hybrid drive system, and "radial" refers to the radial direction of the hybrid drive system.When reference is made to the axial direction above and below, this refers to the axial direction of the hybrid drive system, unless otherwise stated.

[0020] In the context of the present disclosure, the feature that two components, such as the first planet carrier and the second ring gear, are connected to one another in a rotationally fixed manner, is to be understood as meaning that the components, which are connected to one another in a rotationally fixed manner, are arranged coaxially to one another and, in particular when the components are driven, rotate together or simultaneously about a component rotation axis common to the components, such as the main rotation axis, at the same angular velocity, in particular relative to a reference element, such as the housing. In other words, two elements are connected to one another in a rotationally fixed manner if they are arranged coaxially to one another, in particular with respect to their component rotation axis and / or with respect to a rotational symmetry axis, and if they are connected to one another in such a way that they always rotate at the same angular velocity.An element is connected to the housing in a rotationally fixed manner if it cannot be rotated relative to the housing.

[0021] The feature that two components are connected or coupled to one another in a torque-transmitting manner means that the components are coupled or connected to one another in such a way that torque can be transmitted between the components. If the components are connected or coupled to one another in a rotationally fixed manner, the components are also connected or coupled to one another in a torque-transmitting manner. Two components connected to one another in a torque-transmitting manner can thus be connected to one another in a torque-transmitting manner. Furthermore, it is conceivable that two components connected to one another in a torque-transmitting manner are connected to one another via an intermediate transmission unit in a torque-transmitting manner, such that torque can be transmitted between the components via the transmission unit, while the components are connected to one another in a torque-transmitting manner, although the components can be rotatable relative to one another.

[0022] The feature that two components are permanently connected or coupled to one another in a torque-transmitting manner does not mean that a switching element is provided that can be switched between a coupling state that connects or couples the components to one another in a torque-transmitting manner and a decoupling state in which no torque can be transmitted between the components via the switching element. Rather, the components are always and therefore permanently torque-transmitting, i.e., connected or coupled to one another in such a way that torque can be transmitted between the components. Thus, for example, one of the components can be driven by the other component, or vice versa.

[0023] In particular, the feature that two components, such as the first planet carrier and the second ring gear, are permanently connected or coupled to one another in a rotationally fixed manner, does not mean that a switching element is provided which can be switched between a coupling state which connects or couples the components to one another in a rotationally fixed manner and a decoupling state in which the components are decoupled from one another and rotatable relative to one another, so that no torque can be transmitted between the components via the switching element, but rather the components are always or always, and therefore permanently, connected or coupled to one another in a rotationally fixed manner. Furthermore, the feature that two components can be connected or coupled to one another in a rotationally fixed manner means that the components are assigned a switching element which can be switched between at least one coupling state and at least one decoupling state.In the coupled state, the components are connected or coupled to one another in a rotationally fixed manner by means of the switching element. In the uncoupled state, the components are decoupled from one another such that in the uncoupled state the components can be rotated relative to one another about the component rotation axis. The same applies to the feature that two components can be connected or coupled to one another in a torque-transmitting manner. Thus, for example, the feature that two components can be connected or coupled to one another in a torque-transmitting manner is to be understood as meaning that a switching element is assigned to the components, wherein the switching element can be switched between at least one connected state and at least one released state. In the connected state, the components are coupled or connected to one another in a torque-transmitting manner by means of the switching element such that torques can be transmitted between the components, in particular via the switching element.In the release state, the components are decoupled from each other, so that in the release state no torque can be transmitted between the components via the switching element.

[0024] In the context of the present disclosure, a spur gear stage is understood to be a pairing of two gears that mesh with each other. A switchable spur gear stage is understood to be a spur gear stage, wherein one of the two meshing gears of the switchable spur gear stage is designed as a loose gear arranged on a shaft, such as the first output shaft. This loose gear can be selectively connected to the shaft in a rotationally fixed manner by means of a switching element or decoupled from the shaft and thus rotatable relative to the shaft to which one of the two meshing gears is arranged coaxially.

[0025] Furthermore, it is conceivable for the electric machine to be arranged axially parallel, in particular to the planetary gear sets, so that, for example, the machine's axis of rotation is spaced from the respective planetary gear set's axis of rotation and thus from the main axis of rotation, with which the planetary gear set's axes of rotation coincide, and runs parallel to the respective planetary gear set's axis of rotation and parallel to the main axis of rotation. Thus, for example, a gear ratio stage is arranged between the rotor and the second sun gear, so that the rotor is coupled or can be coupled to the second sun gear via the gear ratio stage in a torque-transmitting manner.

[0026] In order to achieve particularly advantageous drivability in a particularly space-efficient manner, one embodiment of the invention provides for the second sub-transmission to have a particularly switchable third spur gear stage and a second output shaft. The second output shaft is rotatable, for example, about a second output shaft rotation axis relative to the housing. For example, the output shaft rotation axes are spaced apart from one another, with the output shaft rotation axes running parallel to one another, for example.For example, the second output shaft axis of rotation is spaced from the input shaft axis of rotation and / or from the first planetary gear set axis of rotation and / or from the second planetary gear set axis of rotation and / or from the machine axis of rotation and / or from the main axis of rotation, wherein the second output shaft axis of rotation preferably runs parallel to the input shaft axis of rotation and / or parallel to the first planetary gear set axis of rotation and / or parallel to the second planetary gear set axis of rotation and / or parallel to the machine axis of rotation and / or parallel to the main axis of rotation. The third spur gear stage has a third output gear meshing with the second input gear, which is in particular a seventh gear of the hybrid drive system. The third output gear is arranged coaxially to the second output shaft. For example, the second output shaft can be driven by the third output gear.In principle, it would be conceivable for the third output gear to be arranged on the second output shaft. In principle, it would be conceivable for the third output gear to be connected, in particular permanently, in a rotationally fixed manner to the second output shaft. Furthermore, it would be conceivable for the third output gear to be rotationally fixedly connected to the second output shaft. A second output gear is also provided, which is, for example, an eighth gear of the hybrid drive system. The second output gear is arranged coaxially to the third output gear. The second output gear is permanently rotationally fixedly connected to the second output shaft and can thus be driven by the second output shaft. The second output gear can therefore be driven by the third output gear via the second output shaft. In addition, the second output gear permanently meshes with the axle drive input gear.

[0027] A further embodiment is characterized by a third switching element, by means of which the second ring gear can be connected in a rotationally fixed manner to the housing of the hybrid drive system. Thus, the third switching element can be switched between a third coupling state and a third decoupling state. In the third coupling state, the second ring gear is connected in a rotationally fixed manner to the housing by means of the third switching element. In the third decoupling state, the second ring gear is decoupled from the housing, so that the second ring gear can rotate about the second planetary gearset rotation axis relative to the housing. This can provide particularly advantageous drivability.

[0028] In order to be able to realize a particularly space-saving design of the hybrid drive system, in particular in the axial direction of the hybrid drive system, it is provided in a further embodiment of the invention that in the axial direction of the hybrid drive system the internal combustion engine, the first output gear, the first shifting element, the first planetary gear set, the third shifting element, the second planetary gear set and the second shifting element are arranged one after the other in the order in which they are named, that is to say in the following order and thus one behind the other or one after the other: the internal combustion engine - the first output gear - the first shifting element - the first planetary gear set - the third shifting element - the second planetary gear set - the second shifting element.Thus, it is preferably provided that, viewed in the axial direction of the hybrid drive system and thus along the main axis of rotation, the first output gear follows the internal combustion engine, the first shifting element follows the first output gear, the first planetary gear set follows the first shifting element, the third shifting element follows the first planetary gear set, the second planetary gear set follows the third shifting element and the second shifting element follows the second planetary gear set.

[0029] In order to achieve a particularly space-efficient design for the hybrid drive system, it has proven particularly advantageous for the first planetary carrier and the second planetary carrier to each be configured as a single planetary carrier. This means, in particular, that planetary gears are rotatably mounted on the respective single planetary carrier, which, in particular, are all configured as simple planetary gears and thus have only a single toothing, which meshes, in particular simultaneously, with the respective sun gear and the respective ring gear of the respective planetary gear set.

[0030] A further embodiment is characterized in that the second spur gear stage is arranged on a side of the first sub-transmission facing away from the first spur gear stage in the axial direction of the hybrid drive system. This allows for a particularly space-efficient design of the hybrid drive system.

[0031] Finally, to achieve a particularly space-efficient design of the hybrid drive system, it has proven particularly advantageous if a rotor wheel of the rotor of the electric machine is arranged on a side of the first sub-transmission facing away from the combustion engine in the axial direction of the hybrid drive system. For example, the rotor wheel is a rotor element that is, in particular, at least substantially disc-shaped and rotatable about the machine's axis of rotation relative to the housing.

[0032] A second aspect of the invention relates to a motor vehicle, also referred to simply as a vehicle, and preferably designed as a motor vehicle, in particular as a passenger car, which has a hybrid drive system according to the first aspect of the invention and can be driven by the hybrid drive system. Advantages and advantageous embodiments of the first aspect of the invention are to be regarded as advantages and advantageous embodiments of the second aspect of the invention, and vice versa.

[0033] Further advantages, features, and details of the invention will become apparent from the following description of preferred embodiments and from the drawings. The features and combinations of features mentioned above in the description, as well as the features and combinations of features mentioned below in the description of the figures and / or shown alone in the figures, can be used not only in the respective specified combinations, but also in other combinations or on their own, without departing from the scope of the invention.

[0034] The drawing shows: Fig. 1 schematic representations of a first embodiment of a hybrid drive system for a motor vehicle; Fig. 2 schematic representations of a second embodiment of the hybrid drive system; and Fig. 3 a shift table illustrating gears of the hybrid drive system.

[0035] In the figures, identical or functionally identical elements are provided with the same reference numerals.

[0036] Fig. 1 shows schematic representations of a first embodiment of a hybrid drive system 10 for a motor vehicle, also simply referred to as a vehicle. The motor vehicle has at least or exactly two vehicle axles arranged one behind the other and thus consecutively in the longitudinal direction of the motor vehicle, namely a first vehicle axle and a second vehicle axle. The respective vehicle axle has at least or exactly two vehicle wheels, wherein the respective vehicle wheels of the respective vehicle axle are arranged on opposite sides of the motor vehicle in the transverse direction of the vehicle. The two vehicle wheels of one of the vehicle axles are in Fig. 1 is shown particularly schematically and designated 12 and 14, wherein the vehicle wheels 12 and 14 and thus the motor vehicle can be driven by means of the hybrid drive system 10. The hybrid drive system 10 has an internal combustion engine 16, which has a drive shaft 18, for example designed as a crankshaft. Via the drive shaft 18, the internal combustion engine 16 can provide first drive torques for driving the vehicle wheels 12 and 14. The hybrid drive system 10 also has an electric machine 20, which has a stator 22 and a rotor 24. The rotor 24 can be driven by means of the stator 22 and can thus be rotated about a machine rotation axis 26 relative to the stator 22 and relative to a housing 28 of the hybrid drive system 10. In the first embodiment and in a Fig. In the second embodiment illustrated in Figure 2, the machine rotational axis 26 coincides with a main rotational axis 30 of the hybrid drive system 10. Via the rotor 24, the electric machine 20 can provide second drive torques for driving the vehicle wheels 12 and 14 and thus the motor vehicle. The hybrid drive system 10 also has an axle drive 32, which has an axle drive input gear 34. A respective third torque resulting from the respective first drive torque and / or the second drive torque can, for example, be introduced into the axle drive input gear 34, i.e., transmitted to the axle drive input gear 34 and thereby introduced via the axle drive input gear 34 into the axle drive 32, thus being transmitted to the axle drive 32, whereby the axle drive 32 can be driven.The axle drive 32 can distribute or split the third torque between the vehicle wheels 12 and 14, as illustrated by arrows 36. Thus, the vehicle wheels 12 and 14 can be driven via the axle drive 32 by the drive shaft 18, thus by the internal combustion engine 16, and by the rotor 24, thus by the electric motor 20. In the first embodiment, the axle drive 32 is designed as a bevel gear differential.

[0037] The hybrid drive system 10 has a transmission 38, which is provided in addition to the axle transmission 32 and is also referred to as the main transmission, which has a first partial transmission 40 and a second partial transmission 42. The first partial transmission 40 has a first planetary gear set 44, which has a first sun gear 46, a first planet carrier 48 and a first ring gear 50. In addition, the first planetary gear set 44 has first planetary gears, which are preferably designed as simple planetary gears. Of the first planetary gears, one in Fig. 1, the first planetary gear is designated 52. The respective first planetary gear is rotatably mounted on the first planetary carrier 48 and meshes, in particular simultaneously, with the sun gear 46 and the ring gear 50. The first partial transmission 40 also has a second planetary gear set 54, which has a second sun gear 56, a second planetary carrier 58 and a second ring gear 60. In addition, the second planetary gear set 54 has second planetary gears, which are preferably designed as simple planetary gears. The second planetary gears are rotatably mounted on the second planetary carrier 58. Of the second planetary gears, Fig. 1, a second planetary gear designated 62 can be seen. The respective second planetary gear meshes, in particular simultaneously, with the sun gear 56 and the ring gear 60. The first sun gear 46 is permanently connected in a rotationally fixed manner to the second planet carrier 58. The second sub-transmission 42 has a first spur gear stage 64, which is designed as a switchable spur gear stage. The second sub-transmission 42 also has a second spur gear stage 66, which in the first embodiment is also designed as a switchable spur gear stage. In addition, the second sub-transmission 42 has a first output shaft 68, which is rotatable about a first output shaft axis of rotation relative to the housing 28. The first spur gear stage 64 has a first input gear 70 and a first output gear 72 that meshes, in particular permanently, with the first input gear 70.The first output gear 72 is arranged coaxially to the first output shaft 68, which can be driven by the output gear 72. In the present case, that is to say in the first embodiment, the first input gear 70 is permanently connected in a rotationally fixed manner to the first ring gear 50. The second spur gear stage 66 has a second input gear 74 and a second output gear 76, which in particular permanently meshes with the second input gear 74 and is arranged coaxially to the first output shaft 68. The first output shaft 68 can be driven by the output gear 76. In the first embodiment, the second input gear 74 is permanently connected in a rotationally fixed manner to the planetary carrier 58. The hybrid drive system 10 has a first output gear 78, which is permanently connected in a rotationally fixed manner to the first output shaft 68.Thus, the output gear 78 is drivable by the output shaft 68, so that the output gear 78 is drivable via the output shaft 68 by the output gear 72 and by the output gear 76.

[0038] The hybrid drive system 10 has a first shifting element B, by means of which the drive shaft 18 can be connected in a rotationally fixed manner to the first planet carrier 48. The hybrid drive system 10 also has a second shifting element C, by means of which the drive shaft 18 can be connected in a rotationally fixed manner to the second sun gear 56. In the first embodiment, a third shifting element A is provided, by means of which the first planet carrier 48 and, in particular via the third shifting element, the second ring gear 60 can be connected in a rotationally fixed manner to the housing 28. In the first embodiment, the second ring gear 60 and the first planet carrier 48 can be connected in a rotationally fixed manner to the housing 28 by means of the third shifting element A, since in the first embodiment the first planet carrier 48 and the second ring gear 60 are permanently connected to one another in a rotationally fixed manner.

[0039] The rotor 24 of the electric machine 20 is coupled or can be coupled to the second sun gear 56 in a torque-transmitting, in particular rotationally fixed, manner such that the respective second drive torque provided or capable of being provided by the electric machine 20 via the rotor 24 can be introduced into the transmission 38 at the second sun gear 56. In the first embodiment, the rotor 24 is permanently connected to the second sun gear 56 in a rotationally fixed manner, such that the sun gear 56 and the rotor 24 can be rotationally fixedly connected to the drive shaft 18 by means of the switching element C.

[0040] The second sub-transmission 42 has a third, in this case switchable, spur gear stage 80 and a second output shaft 82, which is rotatable about a second output shaft axis of rotation relative to the housing 28. In this case, the output shaft axes of rotation run parallel to one another, wherein the output shaft axes of rotation are spaced apart from one another. The third spur gear stage 80 has a third output gear 84 that meshes, in particular permanently, with the second input gear 72 and is arranged coaxially with the output shaft 82. Thus, the output shaft 82 can be driven by the output gear 84. A second output gear 86 is also provided, which is permanently connected to the second output shaft 82 in a rotationally fixed manner. Thus, the output gear 86 is drivable by the output shaft 82, so that the output gear 86 is drivable by the output gear 84 via the output shaft 82. The output gear 84 and the output gear 76 are drivable by the input gear 72.

[0041] The second sub-transmission 42 has a fourth gear stage 88, which is switchable in this case. The gear stage 88 has a third input gear 90, which is or can be connected in a rotationally fixed manner to the second planet carrier 58. In the first embodiment, the input gear 90 is permanently connected in a rotationally fixed manner to the planet carrier 58. The spur gear stage 88 has a fourth output gear 92, which is arranged coaxially to the second output shaft 82. The output shaft 82 can be driven by the output gear 92. The output gear 92 meshes, in particular permanently, with the input gear 70. Thus, the output gear 86 can be driven by the output gear 92 via the output shaft 82.

[0042] In the first embodiment, the output gears 72 and 76 are designed as first idler gears that are rotatably mounted on the output shaft 68. A fourth shifting element D is provided, by means of which the output gear 76 is rotationally fixed to the output shaft 68. A fifth shifting element E is also provided, by means of which the output gear 72 is rotationally fixed to the output shaft 68. In the first embodiment, the output gears 84 and 92 are designed as second idler gears that are rotatably mounted on the second output shaft 82. A sixth shifting element F is provided, by means of which the output gear 92 is rotationally fixed to the output shaft 82. A seventh shifting element G is also provided, by means of which the output gear 84 is rotationally fixed to the output shaft 82.The respective switching element A, B, C, D, E, F, G can be switched between a respective coupling state and a respective decoupling state. In the respective coupling state, the respective switching element A, B, C, D, E, F, G is closed, and in the respective decoupling state, the respective switching element A, B, C, D, E, F, G is open. In the respective coupling state, two respective elements assigned to the respective switching element A, B, C, D, E, F, G are connected to one another in a rotationally fixed manner by means of the respective switching element A, B, C, D, E, F, G assigned to the respective two elements. In the respective decoupling state of the respective switching element A, B, C, D, E, F, G, the two elements assigned to the respective switching element A, B, C, D, E, F, G are decoupled from one another and can rotate relative to one another about a component rotation axis.With regard to shifting element A, the elements assigned to shifting element A are the planet carrier 48 or the ring gear 60 and the housing 28, and the component rotation axis is the main rotation axis 30. With regard to shifting element B, the elements assigned to shifting element B are the planet carrier 48 or the ring gear 60 and the drive shaft 18, and the component rotation axis is the main rotation axis 30. With regard to shifting element C, the elements assigned to shifting element C are the drive shaft 18 and the sun gear 56, and the component rotation axis is the main rotation axis 30. With regard to shifting element E, the elements assigned to shifting element E are the output shaft 68 and the output gear 72, and the component rotation axis is the first output shaft rotation axis.With respect to shift element D, the elements associated with shift element D are the output shaft 68 and the output gear 76, and the component rotation axis is the first output shaft rotation axis. With respect to shift element F, the elements associated with shift element F are the output shaft 82 and the output gear 92, and the component rotation axis is the second output shaft rotation axis. With respect to shift element G, the elements associated with shift element G are the output gear 84 and the output shaft 82, and the component rotation axis is the second output shaft rotation axis.

[0043] Preferably, the planet carriers 48 and 58 are each designed as single planet carriers.

[0044] A rotor wheel 94 of the rotor 24 is arranged in the axial direction of the hybrid drive system 10, the axial direction of which coincides with the main axis of rotation 30, on a side SE1 of the first partial transmission 40 facing away from the internal combustion engine 16.

[0045] Fig. 2 shows a second embodiment of the hybrid drive system 10. As in the first embodiment, in the second embodiment the output gears 78 and 86 mesh, in particular simultaneously, with the axle transmission input gear 34.

[0046] In the second embodiment, the spur gear stage 88, the input gear 90, and the output gear 92 are omitted, with the input gear 74 meshing simultaneously with the output gears 76 and 84. In the second embodiment, the switching element F takes over the function that the switching element G took over in the first embodiment, so that in the second embodiment, the output gear 84 can be connected in a rotationally fixed manner to the output shaft 82 by means of the switching element F.

[0047] In the second embodiment, in the axial direction of the hybrid drive system 10, the internal combustion engine 16, the first output gear 78, the first shifting element B, the first planetary gear set 44, the third shifting element A, the second planetary gear set 54 and the second shifting element C are arranged successively in the following order: the internal combustion engine 16 - the first output gear 78 - the first shifting element B - the first planetary gear set 44 - the third shifting element A - the second planetary gear set 54 - the second shifting element C. In addition, the second spur gear stage 66 and, for example, also the third spur gear stage 80 are arranged in the axial direction of the hybrid drive system 10 on a side SE2 of the first partial transmission 40 facing away from the first spur gear stage 64.

[0048] Fig. Figure 3 shows a shift table illustrating gears H1, H2, H3, H4, H5, H6, HR1, E1, E2, S1, S2, and S4 of the hybrid drive system 10, particularly according to the second embodiment. The gears are arranged in rows, and the shift elements A-F are arranged in columns of the shift table. Fig. 3, "X" means that the switching element in whose column the "X" is entered is closed, and therefore in its coupling state. If nothing is entered in a column for the respective switching element, the respective switching element is open, and therefore the respective switching element is in its decoupling state. Fig.3, “(X)” means that the shift element in whose column “(X)” is entered can be either engaged, i.e. closed, or disengaged, i.e. open, to engage the respective gear in whose row “(X)” is entered. Therefore, to engage gear H1, shift elements A, C and D are closed, while the other shift elements B, E and F are open. To engage gear H2, shift elements C, D and E are closed, while the other shift elements A, B and F are open. To engage gear H3, shift elements B, C and D are closed, in particular simultaneously, while the other shift elements A, E and F are open. To engage gear H4, shift elements B, C and F are closed, while the other shift elements A, D and E are open. To engage gear H5, shift elements B, E and F are closed, while the other shift elements A, C and D are open.To engage gear H6, switching elements B, C and E are closed, while the other switching elements A, D and F are open. To engage gear HR1, switching elements A, C and E are closed, while the other switching elements B, D and F are open. To engage gear E1, switching elements A and D are closed, while switching elements C, E and F are open, and switching element B can be either closed or open. To engage gear E2, switching elements D and E are closed, while switching elements A, B, C and F are open. To engage gear S1, switching elements B and D are closed, while switching elements A, C, E and F are open. To engage gear S2, switching elements B and F are closed, while the other switching elements A, C, D and E are open.To engage gear S4, shift elements B and E are closed, while the other remaining shift elements A, C, D, and F are open. Gears H1, H2, H3, H4, H5, and H6 are hybrid gears in which the vehicle wheels 12 and 14 are driven either by the internal combustion engine and the electric motor, or, with respect to the electric motor and the internal combustion engine, only by the internal combustion engine 16. Gear HR1 is a reverse gear for causing the motor vehicle to travel backward. Gears E1 and E2 are purely electric gears in which the vehicle wheels 12 and 14 are driven exclusively by the electric motor 20 with respect to the internal combustion engine 16 and the electric motor 20.The other, remaining gears S1, S2 and S4 are continuously variable gears, in which an overall transmission ratio, in particular from the internal combustion engine 16 to the vehicle wheels 12 and 14, results depending on a speed at which the rotor 24 rotates about the machine axis of rotation relative to the housing 28. List of reference symbols 10 Hybrid drive system 12 vehicle wheel 14 vehicle wheel 16 combustion engine 18 Drive shaft 20 electric machine 22 Stator 24 rotors 26 Machine rotation axis 28 housings 30 Main axis of rotation 32 axle drives 34 axle drive input gear 36 Arrow 38 gearboxes 40 first partial transmission 42 second partial transmission 44 first planetary gear set 46 first sun gear 48 first planet carrier 50 first ring gear 52 first planetary gear 54 second planetary gear set 56 second sun gear 58 second planet carrier 60 second ring gear 62 second sun gear 64 first spur gear stage 66 second spur gear stage 68 first output shaft 70 first input gear 72 first output gear 74 second input gear 76 second output gear 78 first output gear 80 third spur gear stage 82 second output shaft 84 second output gear 86 second output gear 88 fourth spur gear stage 90 third input gear 92 fourth output gear A third switching element B first switching element C second switching element D fourth switching element E fifth switching element F sixth switching element G seventh switching element SE1 page SE2 page H1-6 gear HR1 gear E1 gear E2 gear S1 gear S2 gear S4 gear

Claims

[1] Hybrid drive system (10) for a motor vehicle, comprising: - an internal combustion engine (16) having a drive shaft (18) via which first drive torques for driving the motor vehicle can be provided by the internal combustion engine (16); - an electric machine (20) having a rotor (24) via which second drive torques for driving the motor vehicle can be provided by the electric machine (20); - an axle drive (34); and - a transmission (38) with a first partial transmission (40) and a second partial transmission (42), wherein: ◯ the first partial transmission (40) has a first planetary gear set (44) with a first sun gear (46), a first planetary carrier (48) and a first ring gear (50), and a second planetary gear set (54) with a second sun gear (56), a second planetary carrier (58) and a second ring gear (60); ◯ the first sun gear (46) is permanently connected to the second planet carrier (58) in a rotationally fixed manner; ◯ the second partial transmission (42) has a first spur gear stage (64), a second spur gear stage (66) and a first output shaft (68); ◯ the first spur gear stage (64) has a first input gear (70) and a first output gear (72) meshing with the first input gear (70); ◯ the first output gear (72) is arranged coaxially to the first output shaft (68); ◯ the first input gear (70) is or can be connected in a rotationally fixed manner to the first ring gear (50); ◯ the second spur gear stage (66) has a second input gear (74) and a second output gear (76) meshing with the second input gear (74); ◯ the second output gear (76) is arranged coaxially to the first output shaft (68); ◯ the second input gear (74) is or can be connected in a rotationally fixed manner to the second planet carrier (58); ◯ a first output gear (78) is permanently connected in a rotationally fixed manner to the first output shaft (68) and permanently meshes with an axle transmission input gear (34) of the axle transmission (32); ◯ a first switching element (B) is provided, by means of which the drive shaft (18) of the internal combustion engine (16) can be connected in a rotationally fixed manner to the first planet carrier (48); ◯ a second switching element (C) is provided, by means of which the drive shaft (18) can be connected in a rotationally fixed manner to the second sun gear (56); and ◯ the rotor (24) of the electric machine (20) is coupled or can be coupled to the second sun gear (56) in such a torque-transmitting manner that the respective second drive torque provided by the electric machine (20) via the rotor (24) can be introduced into the transmission (38) at the second sun gear (56); characterized bythat the first planet carrier (48) is permanently connected in a rotationally fixed manner to the second ring gear (60). [2] Hybrid drive system (10) according to claim 1, characterized by in that the second partial transmission (42) has a third spur gear stage (80) and a second output shaft (82), wherein the third spur gear stage (80) has a third output gear (84) meshing with the second input gear (74), wherein the third output gear (84) is arranged coaxially to the second output shaft (82), and wherein a second output gear (86) is permanently connected in a rotationally fixed manner to the second output shaft (82) and permanently meshes with the axle transmission input gear (34). [3] Hybrid drive system (10) according to claim 1 or 2, characterized by a third switching element (A) which is designed to connect the second ring gear (60) in a rotationally fixed manner to a housing (28) of the hybrid drive system (10). [4] Hybrid drive system (10) according to claim 3, characterized byin that in the axial direction of the hybrid drive system (10) the internal combustion engine (16), the first output gear (78), the first shifting element (B), the first planetary gear set (44), the third shifting element (A), the second planetary gear set (54) and the second shifting element (C) are arranged successively in the following order: the internal combustion engine (16) - the first output gear (78) - the first shifting element (B) - the first planetary gear set (44) - the third shifting element (A) - the second planetary gear set (54) - the second shifting element (C). [5] Hybrid drive system (10) according to one of the preceding claims, characterized by that the first planet carrier (48) and the second planet carrier (58) are each designed as a single planet carrier. [6] Hybrid drive system (10) according to one of the preceding claims, characterized bythat the second spur gear stage (66) is arranged on a side (SE2) of the first partial transmission (40) facing away from the first spur gear stage (64) with respect to an axial direction of the hybrid drive system (10). [7] Hybrid drive system (10) according to claim 6, characterized by that a rotor wheel (94) of the rotor (24) of the electric machine (20) is arranged, with respect to the axial direction, on a side (SE1) of the first partial transmission (40) facing away from the internal combustion engine (16). [8] Motor vehicle, comprising a hybrid drive system (10) according to one of the preceding claims.

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