Hybrid drive system for a motor vehicle, in particular for a motor vehicle

Abstract

Hybrid drive system (10) for a motor vehicle, comprising an internal combustion engine (16) having a crankshaft (22), an electric machine (26) having a rotor (30), an axle transmission (36) and a transmission (44) having a first partial transmission (46) and a second partial transmission (48), wherein: - the first partial transmission (46) comprises: o a first planetary gear set (50) having a first element (52), a second element (54) and a third element (56); and o a second planetary gear set (58) having a fourth element (60), a fifth element (62) and a sixth element (64); - the second partial transmission (48) comprises: o an output shaft (72); o a first spur gear stage (74) having a first output gear (78) arranged coaxially with the output shaft (72) and meshing with a first input gear (76) of the first spur gear stage (74) that is connected or connectable in a rotationally fixed manner to the second element (54); and o a second spur gear stage (80) having a second output gear (84) arranged coaxially with the output shaft (72) and meshing with a second input gear (82) of the second spur gear stage (80) which is connected in a rotationally fixed manner to the sixth element (64) and arranged coaxially with the first input gear (76); - an output gear (86) is permanently connected to the output shaft (72) in a rotationally fixed manner and permanently meshes with an axle transmission input gear (88); - a first switching element (S1) is provided which is designed to connect the crankshaft (22) to the first element (52) in a rotationally fixed manner; - the rotor (30) is coupled or can be coupled to one of the six elements (52, 54, 56, 60, 62, 64) in such a way that torques that can be provided by the electric machine (26) via the rotor (30) can be introduced into the transmission (44) at one of the six elements (52, 54, 56, 60, 62, 64); - a second switching element (S2) is provided, which is designed to connect the third element (56) in a rotationally fixed manner to a housing (38) of the hybrid drive system (10); and - viewed in the axial direction of the hybrid drive system (10), the second spur gear stage (80) is arranged on a side (SE1) of the first partial transmission (46) facing away from the first spur gear stage (74), characterized by a sixth shift element (S6) which is designed to connect the first input gear (76) to the first element (52) in a rotationally fixed manner.

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.

[0002] DE 10 2017 006 082 A1 discloses a hybrid drive device having an internal combustion engine, an electric machine having a rotor, and a planetary gear.

[0003] DE 10 2017 204 970 B3, DE 10 2016 213 737 A1 and the generic DE 10 2016 204 132 A1 show hybrid transmissions with a planetary gear with two planetary gear stages, an electric machine and an output shaft on which two spur gear stages can act.

[0004] The object of the present invention is to provide a hybrid drive system for a motor vehicle, in particular for a motor vehicle, so that a particularly efficient operation of the hybrid drive system and a particularly advantageous drivability can be realized.

[0005] This object is achieved by a hybrid drive system having the features of patent claim 1. Advantageous embodiments with expedient further developments of the invention are specified in the remaining claims.

[0006] The invention relates to a hybrid drive system, also referred to as a hybrid drive device or embodied as a hybrid drive device, 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. 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, for example, at least or exactly two vehicle wheels, also simply referred to as wheels.The vehicle wheels are ground contact elements by means of which the motor vehicle can be or is supported downwards on the ground in the vertical direction of the motor vehicle. The respective vehicle wheels of the respective vehicle axle are arranged, for example, on opposite sides of the motor vehicle in the transverse direction of the motor vehicle. If the motor vehicle is driven along the ground while being supported downwards on the ground in the vertical direction of the vehicle via the ground contact elements, the vehicle wheels roll, in particular directly, on the ground. By means of the hybrid drive system, for example, the vehicle wheels of at least or exactly one of the vehicle axles can be driven, or by means of the hybrid drive system the vehicle wheels of both vehicle axles can be driven. The vehicle wheels that can be driven by means of the hybrid drive system are also referred to as drive wheels, drivable wheels or driven wheels.When reference is made below to vehicle wheels, this refers to the drive wheels unless otherwise stated.

[0007] The hybrid drive system comprises an internal combustion engine, also referred to as an internal combustion engine. The internal combustion engine has a crankshaft, via which the internal combustion engine can provide first drive torques for driving the motor vehicle, in particular for driving the drive wheels. Thus, the internal combustion engine is designed, for example, as a reciprocating piston engine. The hybrid drive system also comprises an electric machine having a rotor. The electric machine can provide second drive torques for driving the motor vehicle, in particular for driving the vehicle wheels, via the rotor. For example, the motor vehicle can be driven by means of an electric machine, in particular purely electrically.Since the motor vehicle can be driven by both the internal combustion engine and the electric machine, the motor vehicle is preferably designed as a hybrid vehicle. Very preferably, the electric machine is a high-voltage component whose electrical voltage, in particular the electrical operating or nominal voltage, is, for example, greater than 50 volts, in particular greater than 60 volts, and very preferably amounts to several hundred volts. 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 crankshaft is, for example, rotatable about a crankshaft axis of rotation relative to a housing element of the internal combustion engine, designed, for example, as an engine block, in particular as a cylinder block.For example, the crankshaft and the rotor are arranged coaxially to each other so that the machine rotation axis coincides with the crankshaft rotation axis.

[0008] The hybrid drive system also has an axle drive. In particular, the axle drive is assigned to the vehicle axle, the vehicle wheels of which can be driven by the internal combustion engine and the electric motor. In particular, the vehicle wheels can be driven via the axle drive by the internal combustion engine, in particular by the crankshaft, and by the electric motor, in particular by the rotor. Very particularly, the axle drive is a differential gear, also simply referred to as a differential. For example, a respective input torque resulting from the respective first drive torque and / or from the respective second drive torque can be transmitted to the axle drive. In other words, the respective input torque can be introduced into the axle drive, whereby the axle drive can be driven.For example, the respective input torque is the respective first drive torque and / or the respective second drive torque. In particular, the respective input torque introduced or introduceable into the axle drive can be divided and transmitted to the vehicle wheels, in particular equally, via the axle drive or by means of the axle drive, so that the vehicle wheels can be driven by the respective input torque and thus by the internal combustion engine and / or the electric motor via the axle drive.In particular, the axle drive has the function already sufficiently known from the general state of the art that the axle drive allows different speeds of the vehicle wheels when the motor vehicle is cornering, in particular such that the vehicle wheel on the outside of the curve rotates or can rotate at a higher speed than the vehicle wheel on the inside of the curve, in particular while the vehicle wheels can be driven by the internal combustion engine and the electric machine via the axle drive or are driven by the electric machine and / or the internal combustion engine.

[0009] The hybrid drive system also has a transmission, in particular provided in addition to the axle transmission, via which the axle transmission can be driven, for example, by the electric machine and by the internal combustion engine, i.e., by the rotor and the crankshaft. Thus, for example, the transmission can provide the respective input torque. For example, the respective first drive torque and the respective second drive torque can be introduced into the transmission. In other words, it is conceivable that a respective transmission torque resulting from the respective first drive torque and / or from the respective second drive torque can be introduced into the transmission in order to thereby drive the transmission, wherein, for example, the transmission can provide the respective input torque resulting from the respective transmission torque.Thus, for example, with respect to a torque flow via which a respective torque that can be provided or is provided by the rotor and the crankshaft can be transmitted to the axle drive in order to drive the axle drive and, via the axle drive, the vehicle wheels, the axle drive is arranged in the torque flow, wherein the transmission is also arranged in the torque flow, and wherein, for example, the transmission is arranged upstream of the axle drive and downstream of the rotor, and wherein the transmission is arranged upstream of the axle drive and downstream of the crankshaft.

[0010] The transmission has a first sub-transmission and a second sub-transmission. The first sub-transmission has a first planetary gear set, which is also referred to as the first planetary set. For example, the first planetary gear set has a first sun gear, a first planet carrier, also referred to as the first web, and a first ring gear. Furthermore, the first planetary gear set, for example, has at least one first planet gear, which meshes, in particular simultaneously, with the first ring gear and with the first sun gear, wherein, for example, meshing of the first sun gear with the first ring gear is omitted. In particular, the first planet gear is rotatably held on the first planet carrier. The first sun gear, the first ring gear, and the first planet carrier are also referred to as transmission elements of the first planetary gear set or are transmission elements of the first planetary gear set.The first planetary gear set comprises a first element, a second element, and a third element. For example, the first element is a first of the transmission elements, for example, the second element is a second of the transmission elements, and for example, the third element is a third of the transmission elements.

[0011] The first sub-transmission also has a second planetary gear set, which is also referred to as a second planetary gear set. For example, the second planetary gear set, which is preferably provided in addition to the first planetary gear set, has a second sun gear, provided in particular in addition to the first sun gear, a second planet carrier, provided in particular in addition to the first planet carrier, and a second ring gear, provided in particular in addition to the first ring gear, wherein the second planet carrier is also referred to as a second carrier. For example, the second planetary gear set has at least one second planet gear, which is rotatably held on the second planet carrier. In particular, the second planet gear meshes with the second sun gear and with the second ring gear, in particular simultaneously, wherein, for example, meshing of the second sun gear with the second ring gear is omitted.The second sun gear, the second planet carrier, and the second ring gear are also referred to as planetary gear elements or are planetary gear elements of the second planetary gear set. The second planetary gear set has a fourth element, a fifth element, and a sixth element. In particular, the fourth element is a first of the planetary gear elements, for example, the fifth element is a second of the planetary gear elements, and the sixth element is a third of the planetary gear elements of the second planetary gear set.

[0012] The hybrid drive system has, for example, a housing, wherein, for example, the first partial transmission, thus the first planetary gear set and / or the second planetary gear set, can be arranged at least partially in the housing. In particular when the respective transmission element is not connected to the housing in a rotationally fixed manner, the respective transmission element can be rotated about a transmission element rotation axis relative to the housing, in particular by driving the respective transmission element. The transmission element rotation axis is also referred to as the first planetary gear set rotation axis. In particular when the respective planetary gear element is not connected to the housing in a rotationally fixed manner, the respective planetary gear element can be rotated about a planetary gear element rotation axis relative to the housing, in particular by driving the respective planetary gear element. The planetary gear element rotation axis is also referred to as the second planetary gear set rotation axis.In particular, it is conceivable for the planetary gear sets to be arranged coaxially with one another, so that the planetary gear set axes of rotation coincide, and thus the transmission element axis of rotation coincides with the planetary gear element axis of rotation. In particular, it is conceivable for the internal combustion engine and / or the electric machine to be arranged coaxially with the first planetary gear set and / or coaxially with the second planetary gear set. In particular, the respective planetary gear set axis of rotation runs in the axial direction of the transmission and of the hybrid drive system as a whole, wherein, for example, the axial direction of the transmission, in particular of the hybrid drive system as a whole, coincides with the respective planetary gear set axis of rotation. Furthermore, it is conceivable for the axial direction of the transmission to run in the axial direction of the axle transmission, in particular coincide with the axial direction of the axle transmission.

[0013] The second sub-transmission has an output shaft, via which, for example, the second sub-transmission and thus in particular the transmission can provide the respective input torque. The second sub-transmission has a first spur gear stage, which is provided in particular in addition to the planetary gear sets and which has a first output gear as the first spur gear. The first output gear is arranged coaxially to the output shaft. In addition, the first output gear meshes with a first input gear of the first spur gear stage, which is or can be connected in a rotationally fixed manner to the second element, wherein the first input gear is designed, for example, as a second spur gear of the first spur gear stage. In particular, the first output gear and the first input gear mesh directly with one another.For example, with respect to the aforementioned torque flow along which the respective input torque can be transmitted from the transmission to the axle transmission, the first output gear and the first input gear are arranged in the torque flow such that the first output gear is arranged downstream of the first input gear.

[0014] The second sub-transmission also has a second spur gear stage, which is provided in addition to the first spur gear stage and has a second output gear as the third spur gear, which is arranged coaxially to the output shaft and meshes with a second input gear of the second spur gear stage, which is connected, in particular, permanently and non-rotatably to the sixth element. In particular, the second input gear is a fourth spur gear of the second spur gear stage. In particular, the second input gear and the second output gear mesh directly with one another. With respect to the aforementioned torque flow, for example, the second input gear and the second output gear are arranged in the torque flow such that the second output gear is arranged downstream of the second input gear.In particular, with respect to the torque flow, the partial transmissions are arranged in the torque flow, in particular such that the second partial transmission is arranged downstream of the first partial transmission, so that the axle transmission can be driven by the first partial transmission via the second partial transmission.

[0015] In particular, with respect to the torque flow, the output shaft is arranged in the torque flow, in particular such that the output shaft is arranged upstream of the axle drive and downstream of the spur gear stages.

[0016] The hybrid drive system further comprises an output gear, which is provided in particular in addition to the input gears and in addition to the output gears. In particular, the output shaft can be driven by the first output gear and by the second output gear, so that, for example, the output shaft can be driven by the first input gear via the first output gear and by the second input gear via the second output gear. Thus, for example, the respective output gear is or can be connected in a rotationally fixed manner to the output shaft. In particular, it is conceivable that the respective output gear can be permanently connected in a rotationally fixed manner to the output shaft.

[0017] The output gear is permanently connected to the output shaft. Furthermore, the output gear permanently meshes with an axle drive input gear, which is designed as a gear. The feature that the output gear permanently meshes with the axle drive input gear means that the hybrid drive system cannot be switched between a meshing state, in which the output gear meshes with the axle drive input gear, and a non-mesh state, in which the output gear does not mesh with the axle drive input gear. Instead, the output gear and the axle drive input gear always mesh, meaning they are always and therefore permanently in mesh with each other.Thus, for example, the respective input torque can be provided by the output gear and transmitted, in particular directly, to the axle drive input gear and thus introduced into the axle drive, whereby the axle drive can be driven, for example, and thus rotated relative to the housing, in particular about an axle drive rotation axis. By driving the axle drive, the vehicle wheels can be driven.

[0018] The hybrid drive system further comprises a first switching element, which is designed to connect the crankshaft to the first element in a rotationally fixed manner. This means that the crankshaft can be connected to the first element in a rotationally fixed manner by means of the first switching element. The first switching element can, for example, be switched between a first coupling state and a first decoupling state. In the first coupling state, the crankshaft is connected to the first element in a rotationally fixed manner by means of the first switching element.In the first decoupling state, the first shifting element releases the crankshaft for rotation about the crankshaft axis of rotation or about the transmission element axis of rotation and relative to the first element, such that in the first decoupling state, the crankshaft and the first element are rotatable relative to one another about the crankshaft axis of rotation or about the transmission element axis of rotation, and such that, in particular in the first decoupling state, no torque can be transmitted between the crankshaft and the first element via the first shifting element. For example, the first shifting element can be moved, in particular relative to the housing and / or translationally, between at least one first coupling position bringing about the first coupling state and at least one first decoupling position bringing about the first decoupling state.

[0019] The rotor of the electric machine is coupled or can be coupled to one of the six elements mentioned, in particular in a torque-transmitting manner, most particularly in a rotationally fixed manner, such that the respective first drive torque provided or capable of being provided by the electric machine via the rotor can be introduced into the transmission at one of the six elements mentioned. In other words, the rotor of the electric machine is coupled or can be coupled to one of the six elements mentioned such that torques originating from the electric machine or the rotor can be introduced into the transmission at one of the six elements mentioned.

[0020] In order to achieve particularly efficient operation of the hybrid drive system and particularly advantageous drivability, it is further provided, in a known manner, that the hybrid drive system has a second switching element designed to connect the third element to the housing of the hybrid drive system in a rotationally fixed manner. This means that the third element can be connected to the housing in a rotationally fixed manner by means of the second switching element.

[0021] For example, the second switching element can be switched between a second coupled state and a second uncoupled state. In the second coupled state, the third element is connected to the housing in a rotationally fixed manner by means of the second switching element, and is therefore fixed to the housing in a rotationally fixed manner, such that the third element cannot rotate about the transmission element axis of rotation relative to the housing. In the second uncoupled state, the second switching element releases the third element for rotation about the transmission element axis of rotation and relative to the housing, such that in the second uncoupled state the third element can be rotated about the transmission element axis of rotation relative to the housing, and such that in particular in the second uncoupled state no torque can be transmitted between the third element and the housing via the second switching element.For example, the second switching element can be moved, in particular translationally and / or relative to the housing, between at least one second coupling position causing the second coupling state and at least one second decoupling position causing the second decoupling state.

[0022] Viewed in the axial direction of the hybrid drive system and thus, for example, along the respective planetary gear set rotation axis, the second spur gear stage is arranged on a side of the first partial transmission facing away from the first spur gear stage, in particular in the axial direction of the hybrid drive system, so that, viewed in the axial direction of the hybrid drive system, the first partial transmission, in particular the first planetary gear set and the second planetary gear set, is arranged between the spur gear stages.

[0023] In the context of the present disclosure, the feature that two components are connected to one another in a rotationally fixed manner is to be understood as meaning that the components 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 at the same angular velocity, in particular relative to the housing. In other words, "rotationally fixed" is to be understood as follows: Two rotatably mounted elements are connected to one another in a rotationally fixed manner when they are arranged coaxially to one another and are connected to one another in such a way that they rotate at the same angular velocity, in particular about the component rotation axis and relative to the housing, when the elements are driven.

[0024] The feature that two components are connected to one another in a torque-transmitting manner is to be understood as meaning that the components are coupled or connected to one another in such a way that torques can be transmitted between the components, whereby if the components are connected to one another in a rotationally fixed manner, the components are also connected to one another in a torque-transmitting manner.

[0025] The feature that two components are permanently connected to one another in a torque-transmitting manner means that a switching element is not provided that can be switched between a coupled state connecting 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 connected to one another in a torque-transmitting manner, i.e., they are connected 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.In particular, the feature that the components are permanently connected to one another in a rotationally fixed manner is to be understood as meaning that a switching element is not provided which can be switched between a coupling state connecting the components to one another in a rotationally fixed manner and a decoupling state in which the components are decoupled from one another and can be rotated 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 therefore always permanently connected or coupled to one another in a rotationally fixed manner.

[0026] The feature that two components can be connected or coupled to one another in a rotationally fixed or torque-transmitting manner is to be understood in particular as meaning that the components are assigned a switching element that can be switched between at least one coupling state and a decoupling state. In the coupling state, the components are connected to one another in a rotationally fixed or torque-transmitting manner by means of the switching element. In the decoupling state, the components are decoupled from one another, so that in the decoupled state the components are rotatable relative to one another, in particular about the component rotation axis, and in particular so that no torque can be transmitted between the components via the switching element.

[0027] In the context of the present disclosure, ordinal numerals, also referred to as ordinalia, such as "first", "first", "second", "second", etc., are not necessarily used to indicate or imply a number or quantity of elements to which the ordinal numerals refer, but rather to be able to unambiguously refer to concepts or elements to which the ordinal numerals are assigned or to which the ordinal numerals refer.

[0028] Furthermore, the terms "axial" and "coaxial" refer in particular to the respective planetary gearset rotational axis, with the planetary gearset rotational axes coinciding. Furthermore, "axially overlapping" is understood as follows: Two elements are arranged axially overlapping, in particular with one another, if the elements are arranged in regions of the same axial coordinates. For example, in the case of two elements arranged axially overlapping with one another, there is at least one radially arranged straight line, thus running in the radial direction of the hybrid drive system and thus perpendicular to the axial direction of the hybrid drive system, which penetrates or intersects both the one and the other of the axially overlapping elements.

[0029] The axle drive input gear is preferably a gear which is, for example, in particular permanently, connected in a rotationally fixed manner to a differential cage of the axle drive, also referred to as a differential carrier.

[0030] In order to be able to shift the hybrid drive system particularly as needed and thus achieve particularly advantageous drivability, the invention provides that the hybrid drive system has a sixth shifting element designed to connect the first input gearwheel to the first element in a rotationally fixed manner. In other words, the first input gearwheel can be connected to the first element in a rotationally fixed manner by means of the sixth shifting element. For example, the sixth shifting element can be switched between a sixth coupled state and a sixth uncoupled state. In the sixth coupled state, the first input gearwheel is connected to the first element in a rotationally fixed manner by means of the sixth shifting element.In the sixth decoupling state, the sixth shifting element releases the first input gear for rotation about the first planetary gearset axis of rotation and relative to the first element, so that in the sixth decoupling state, the first input gear and the first element are rotatable relative to one another about the first planetary gearset axis of rotation. For example, the sixth shifting element is movable, in particular relative to the housing and / or translationally, between at least one sixth coupling position effecting the sixth coupling state and at least one sixth decoupling position effecting the sixth decoupling state.

[0031] In order to realize a particularly compact design and a particularly efficient operation and thus to be able to keep the power loss advantageously low, it is provided in one embodiment of the invention that a total of exactly two planetary gear sets are provided, namely the first planetary gear set and the second planetary gear set.

[0032] A further embodiment is characterized by a third switching element which is designed to connect the first input gearwheel in a rotationally fixed manner to the second element. In other words, the first input gearwheel can be connected in a rotationally fixed manner to the second element by means of the third switching element. For example, the third switching element can be switched between a third coupling state and a third decoupling state. In the third coupling state, the first input gearwheel is connected in a rotationally fixed manner to the second element by means of the third switching element. In the third decoupling state, the third switching element releases the first input gearwheel for rotation about the first planetary gearset axis of rotation and relative to the second element, such that the first input gearwheel and the second element can be rotated relative to one another about the transmission element axis of rotation, i.e. about the first planetary gearset axis of rotation, in the third decoupling state.For example, the third switching element can be moved, in particular translationally and / or relative to the housing, between a third coupling position that effects the third coupling state and at least one third decoupling position that effects the third decoupling state. By using the third switching element, advantageous switchability and thus drivability can be achieved.

[0033] In order to be able to realize particularly efficient operation and particularly advantageous drivability, a further embodiment of the invention provides that the second element is or can be connected to the fourth element in a rotationally fixed manner. This means that the second element can be connected, in particular permanently, to the fourth element in a rotationally fixed manner. Furthermore, it is conceivable to provide an eighth switching element, by means of which the second element can be connected to the fourth element in a rotationally fixed manner. For example, the eighth switching element can be switched between an eighth coupling state and an eighth decoupling state. In the eighth coupling state, the second element is connected to the fourth element in a rotationally fixed manner by means of the eighth switching element.In the eighth decoupling state, the eighth shifting element releases the second element for rotation about the respective planetary gear set rotational axis and relative to the fourth element, so that in the eighth decoupling state, the second element and the fourth element are rotatable relative to one another about the respective planetary gear set rotational axis. For example, the eighth shifting element can be moved, in particular translationally and / or relative to the housing, between at least one eighth coupling position causing the eighth coupling state and at least one eighth decoupling position causing the eighth decoupling state.

[0034] A further embodiment is characterized by a fourth switching element which is designed to connect the third element to the fifth element in a rotationally fixed manner.

[0035] This allows for particularly advantageous shiftability and thus drivability. In other words, the third element can be connected to the fifth element in a rotationally fixed manner by means of the fourth shifting element. For example, the fourth shifting element can be switched between a fourth coupled state and a fourth uncoupled state. In the fourth coupled state, the third element is connected to the fifth element in a rotationally fixed manner by means of the fourth shifting element. In the fourth uncoupled state, the fourth shifting element releases the third element for rotation about the respective planetary gear set axis of rotation and relative to the fifth element, such that in the fourth uncoupled state the third element and the fifth element can rotate relative to one another about the respective planetary gear set axis of rotation.For example, the fourth switching element can be moved, in particular translationally and / or relative to the housing, between at least one fourth coupling position causing the fourth coupling state and at least one fourth decoupling position causing the fourth decoupling state.

[0036] In a further, particularly advantageous embodiment of the invention, the hybrid drive system comprises a fifth switching element which is designed to connect the fifth element in a rotationally fixed manner to the first element or to the crankshaft. The first element and the crankshaft are collectively referred to as coupling elements. In other words, the fifth element can be rotationally fixedly connected to the respective coupling element by means of the fifth switching element. Thus, in a first variant, it is conceivable that the fifth element can be rotationally fixedly connected to the first element by means of the fifth switching element. In a second variant, it is conceivable that the fifth element can be rotationally fixedly connected to the crankshaft by means of the fifth switching element. For example, the fifth switching element can be switched between a fifth coupling state and a fifth decoupling state.In the fifth coupling state, the fifth element is connected in a rotationally fixed manner to the respective coupling element by means of the fifth switching element. In the fifth uncoupling state, the fifth switching element releases the fifth element for rotation about the second planetary gear set axis of rotation and relative to the respective coupling element, such that in the fifth uncoupling state, the respective coupling element and the fifth element can be rotated relative to one another about the second planetary gear set axis of rotation. For example, the fifth switching element can be moved, in particular translationally and / or relative to the housing, between at least one fifth coupling position bringing about the fifth coupling state and at least one fifth uncoupling position bringing about the fifth uncoupling state.This allows, for example, gears of the hybrid drive system to be shifted as needed, so that particularly advantageous shiftability and thus particularly advantageous drivability can be achieved.

[0037] In order to be able to realize particularly efficient operation and particularly advantageous drivability in a particularly space- and weight-efficient manner, it is provided in a further embodiment of the invention that the rotor of the electric machine is or can be coupled to the fifth element in such a way, in particular in a torque-transmitting and very particularly rotationally fixed manner, that the respective second drive torque that can be provided or is provided by the electric machine via the rotor can be introduced at the fifth element or via the fifth element into the transmission. In other words, it is preferably provided that the rotor of the electric machine is or can be coupled to the fifth element in such a way that torques originating from the electric machine or from the rotor can be introduced into the transmission at the fifth element.

[0038] A further embodiment is characterized in that the rotor of the electric machine is or can be coupled to the first element, in particular in a torque-transmitting and very particularly rotationally fixed manner, in such a way that torques that can be provided by the electric machine via the rotor, thus the respective second drive torque that can be provided or is provided by the electric machine via the rotor, can be introduced into the transmission at the first element. In other words, it is preferably provided that the rotor of the electric machine is or can be coupled to the first element in such a way that torques originating from the electric machine or from the rotor at the first element can be introduced into the transmission. This makes it possible to achieve a particularly compact design as well as particularly efficient operation and particularly advantageous drivability.

[0039] In order to be able to realize particularly advantageous drivability and particularly efficient operation in a particularly space-saving manner, it is provided in a further embodiment of the invention that the rotor of the electric machine is coupled or can be coupled, i.e. connected or connectable, to the second element, in particular in a torque-transmitting and very particularly rotationally fixed manner, in such a way that torques that can be provided by the electric machine via the rotor, thus the respective second drive torque that can be provided or is provided by the electric machine via the rotor, can be introduced into the transmission at the second element.In other words, the rotor of the electric machine is preferably coupled or can be coupled to the second element in such a way that torques originating from the electric machine or from the rotor can be introduced at the second element and thus via the second element into the transmission.

[0040] A further embodiment is characterized by a seventh shifting element which is designed to connect the first input gear in a rotationally fixed manner to the third element. Thus, by means of the seventh shifting element, the first input gear can be connected in a rotationally fixed manner to the third element. For example, the seventh shifting element can be switched between a seventh coupling state and a seventh decoupling state. In the seventh coupling state, the first input gear is connected in a rotationally fixed manner to the third element by means of the seventh shifting element. In the seventh decoupling state, the seventh shifting element releases the first input gear for rotation about the first planetary gear set axis of rotation relative to the third element, such that in the seventh decoupling state, the first input gear and the third element can be rotated relative to one another about the first planetary gear set axis of rotation.For example, the seventh switching element can be moved, in particular translationally and / or relative to the housing, between at least one seventh coupling position causing the seventh coupling state and at least one seventh decoupling position causing the seventh decoupling state.

[0041] In this case, it is preferably provided that the rotor of the electric machine is permanently coupled, in particular in a torque-transmitting and very particularly rotationally fixed manner, to the first input gear, i.e. is connected, such that the respective second drive torque, which can be provided or is provided by the electric machine via the rotor, can be introduced at the first input gear and thus via the first input gear into the transmission. In other words, it is preferably provided that the rotor of the electric machine is permanently coupled to the first input gear in such a way that torques originating from the electric machine or from the rotor can be introduced at the first input gear and thus via the first input gear into the transmission. This allows for particularly advantageous shiftability and thus drivability of the hybrid drive system to be achieved in a particularly space-efficient manner.

[0042] Finally, it has proven particularly advantageous if the crankshaft is arranged coaxially with the first sub-transmission, so that the crankshaft's axis of rotation coincides with the planetary gear set's axes of rotation. In this case, it is preferably provided that the output gear is arranged axially between the internal combustion engine and the first sub-transmission. In particular, for example, the output gear is arranged axially overlapping the internal combustion engine and axially overlapping the first sub-transmission. This allows for a particularly compact design as well as particularly advantageous drivability and efficient operation of the hybrid drive system.

[0043] The invention enables the hybrid drive system, in particular the transmission and very particularly the first sub-transmission, to be implemented as a multi-stage transmission based on coupled planetary gear sets, namely the first planetary gear set and the second planetary gear set, in particular in an axially parallel design, whereby power loss can be kept particularly low. For example, up to six hybrid and / or combustion engine forward gears, one combustion engine reverse gear, and at least two electric gears, as well as various continuously variable driving ranges, can be realized. A particularly wide range of gear ratios can be achieved. The planetary gear sets are preferably designed as simple planetary gear sets. At least one of the shifting elements can be designed as a positive-locking shifting element, in particular as a dog clutch, in particular with or without a synchronization unit, in order to thereby keep losses particularly low.Good gearing efficiencies can be achieved. The electric motor can be arranged coaxially or laterally, thus in a so-called side-by-side arrangement. Particularly when the electric motor is arranged coaxially, it is possible to place at least one or more of the shifting elements within the electric machine. Additional claw shifting elements are conceivable, particularly through the use of the electric motor. Furthermore, continuously variable gears can be implemented, or they can be non-variable.

[0044] Further advantages, features and details of the invention will become apparent from the following description of preferred embodiments and from the drawings.

[0045] The drawing shows: Fig. 1 a schematic representation of a first embodiment of a hybrid drive system for a motor vehicle, in particular for a motor vehicle; Fig. 2 is a schematic representation of a second embodiment of the hybrid drive system; Fig. 3 is a schematic representation of a third embodiment of the hybrid drive system; Fig. 4 a schematic representation of a fourth embodiment of the hybrid drive system.

[0046] In the figures, identical or functionally identical elements are provided with the same reference numerals.

[0047] Fig. 1 shows a schematic representation of a first embodiment of a hybrid drive system 10 for a motor vehicle, also simply referred to as a vehicle, which is preferably designed as a motor vehicle, in particular as a passenger car. The motor vehicle has at least or exactly two vehicle axles arranged one behind the other in the vehicle's longitudinal direction and thus consecutively, wherein the respective vehicle axle has at least or exactly two vehicle wheels. The respective vehicle wheels of the respective vehicle axle are arranged on opposite sides in the vehicle's transverse direction. By means of the hybrid drive system 10, the vehicle wheels of at least one of the vehicle axles can be driven, wherein the vehicle wheels drivable by means of the hybrid drive system 10 in Fig. 1 and are designated 12 and 14. The hybrid drive system 10 has an internal combustion engine 16, also referred to as an internal combustion engine, which is designed as a reciprocating piston engine. The internal combustion engine 16 has an engine block 18 designed as a cylinder block, which has or forms a plurality of cylinders 20. A respective combustion chamber is at least partially delimited by the respective cylinder 20, wherein during fired operation of the internal combustion engine 16, combustion processes take place in the combustion chamber. The internal combustion engine 16 has a crankshaft 22, via which the internal combustion engine 16 can provide first drive torques for driving the vehicle wheels 12 and 14 and thus for driving the motor vehicle. The crankshaft 22 is rotatable about a crankshaft rotation axis 24 relative to the engine block 18.

[0048] The hybrid drive system 10 also includes an electric machine 26, which has a stator 28 and a rotor 30. The rotor 30 is drivable by means of the stator 28 and is thus rotatable about a machine rotation axis 32 relative to the stator 28. In the first embodiment, the electric machine 26 and the internal combustion engine 16 are arranged coaxially with one another, so that the crankshaft rotation axis 24 and the machine rotation axis 32 coincide. Via its rotor 30, the electric machine 26 can provide second drive torques for driving the vehicle wheels 12 and 14 and thus for driving the motor vehicle. The respective drive torque is also referred to as torque or is a respective torque.

[0049] The vehicle axle having the vehicle wheels 12 and 14 is in Fig. 1 with 34. The vehicle axle 34 also has an axle drive 36, which is a component of the hybrid drive system 10. A respective input torque can be introduced into the axle drive 36, whereby the axle drive 36 can be driven and, in particular, can be rotated about an axle drive axis of rotation, in particular relative to a housing 38 of the hybrid drive system 10. In the present case, the axle drive axis of rotation runs parallel to the crankshaft axis of rotation 24 and parallel to the engine axis of rotation 32 and is spaced apart from the crankshaft axis of rotation 24 and the engine axis of rotation 32. In Fig. 1, arrows 40 and 42 illustrate that the respective input torque that can be introduced or is introduced into the axle drive 36 can be divided and transmitted, in particular half, to the vehicle wheels 12 and 14 by means of the axle drive 36, so that the vehicle wheels 12 and 14 can be driven by the internal combustion engine 16 and the electric machine 26 via the axle drive 36. The respective input torque results from the respective first drive torque and from the respective second drive torque, in particular when the internal combustion engine 16 provides the first drive torque and the electric machine 26 provides the second drive torque at the same time.For example, if the internal combustion engine 16 provides the first drive torque while the electric machine 26 does not provide the second drive torque, the respective input torque results from the respective first drive torque. For example, if the electric machine 26 provides the second drive torque while the internal combustion engine 16 does not provide the first drive torque, the respective input torque results from the respective second drive torque.

[0050] The hybrid drive system 10 also has a transmission 44 provided in addition to the axle transmission 36, which comprises a first partial transmission 46 and a second partial transmission 48. The first partial transmission 46 has a first planetary gear set 50, which has a first sun gear 52, a first planet carrier 54 and a first ring gear 56. The sun gear 52 is also referred to as the first element, the planet carrier 54 is also referred to as the second element and the ring gear 56 is also referred to as the third element. In other words, in the Fig. In the first embodiment shown in Figure 1, the sun gear 52 is a first element, the planet carrier 54 is a second element, and the ring gear 56 is a third element. Generally speaking, the sun gear 52, the planet carrier 54, and the ring gear 56 are gear elements of the planetary gear set 50, with the first element being a first of the gear elements, the second element being a second of the gear elements, and the third element being a third of the gear elements.

[0051] The first sub-transmission 46 also has a second planetary gear set 58, which has a second sun gear 60, a second planet carrier 62, and a second ring gear 64. In the first embodiment, the sun gear 60 is a fourth element, the planet carrier 62 is a fifth element, and the ring gear 64 is a sixth element. Generally speaking, the sun gear 60, the planet carrier 62, and the ring gear 64 are planetary gear elements of the planetary gear set 58, with a first of the planetary gear elements being the fourth element, a second of the planetary gear elements being the fifth element, and a third of the planetary gear elements being the sixth element. It can be seen that the planetary gear sets 50 and 58 are arranged coaxially with one another. In particular, when the respective element is not rotationally fixedly connected to the housing 38, the respective element is rotatable about a planetary gear set rotation axis 66 relative to the housing 18.In the present case, the planetary gear sets 50 and 58 are arranged coaxially to the internal combustion engine 16 and coaxially to the electric machine 26.

[0052] The first planetary gear set 50 has at least one first planet gear 68, which meshes with the first sun gear 52 and with the first ring gear 56, in particular simultaneously. The planet gear 68 is rotatably held on the first planet carrier 54. The second planetary gear set 58 has at least one second planet gear 70, which meshes, in particular simultaneously, with the second sun gear 60 and with the second ring gear 64. The planet gear 70 is rotatably held on the planet carrier 62. It can be seen that the planetary gear sets 50 and 58 are not stacked; rather, the planetary gear sets 50 and 58 follow one another completely in the axial direction of the respective planetary gear set 50, 58 and thus along the planetary gear set rotation axis 66.

[0053] The second sub-transmission 48 has an output shaft 72, which is rotatable about an output shaft rotation axis relative to the housing 38. The crankshaft rotation axis 24, the engine rotation axis 32, and the planetary gear set rotation axis 66 are collectively referred to as rotation axes, since they coincide in this case. The output shaft rotation axis runs parallel to the rotation axis and is spaced from the rotation axis. The axle transmission rotation axis runs parallel to the rotation axis and is spaced from the rotation axis. The axle transmission rotation axis runs parallel to the output shaft rotation axis and is spaced from the output shaft rotation axis, and vice versa. For example, the transmission 44, in particular the second sub-transmission 48, can provide the respective input torque via the output shaft 72.

[0054] The second sub-transmission 48 has a first spur gear stage 74, which has a first input gear 76 as the first spur gear and a first output gear 78 as the second spur gear. The first spur gear and the second spur gear mesh directly with each other, i.e., they are directly engaged with each other. The output gear 78 is arranged coaxially with the output shaft 72, wherein the output shaft 72 is drivable by the output gear 78. In the present case, the output gear 78 is connected, in particular permanently, in a rotationally fixed manner to the output shaft 72. In the first embodiment, the first input gear 76 is rotationally fixedly connectable to the second element, thus to the first planet carrier 54.

[0055] The second sub-gearbox 48 has a second spur gear stage 80, which has a second input gear 82 and a second output gear 84. The second input gear 82 is a third spur gear, and the second output gear 84 is a fourth spur gear. The third spur gear and the fourth spur gear are directly engaged with each other, i.e., mesh directly with each other. The output gear 84 is arranged coaxially with the output shaft 72, wherein the output shaft 72 is drivable by the output gear 84. In the Fig. In the first embodiment shown in Figure 1, the output gear 84 is connected, in particular permanently, in a rotationally fixed manner to the output shaft 72.

[0056] The second input gear 82 is, in particular permanently, non-rotatably connected to the sixth element, thus to the ring gear 64. The second input gear 82 is arranged coaxially with the first input gear 76.

[0057] Also provided is an output gear 86, which is designed, for example, as a fifth spur gear. The output gear 86 is arranged coaxially to the output shaft 72, wherein the output gear 86 is drivable by the output shaft 72. In the Fig. In the first embodiment shown in Figure 1, the output gear 86 is connected, in particular permanently, in a rotationally fixed manner to the output shaft 72. It can be seen that the output gears 78 and 84 and the output gear 86 are arranged consecutively in the axial direction of the output shaft 72 and thus along the output shaft rotation axis and are arranged coaxially to one another.

[0058] The output gear 86 permanently meshes with an axle drive input gear 88 of the axle drive 36, whose axle drive input gear 88 can be designed as a further gear, in particular a sixth spur gear. The axle drive input gear 88 is also referred to as a gear wheel or toothed wheel. It can be seen that the gear wheel is or can be connected in a rotationally fixed manner to a housing element 90 of the axle drive 36. In the first embodiment, the axle drive input gear 88 is permanently connected in a rotationally fixed manner to the housing element 90. The housing element 90 is a differential cage, also referred to as a differential carrier, which, like the axle drive input gear 88, is rotatable about the axle drive rotation axis relative to the housing 38.

[0059] In the first embodiment, the axle drive 36 comprises compensating gears 92, which are mounted on the housing element 90 so as to be rotatable relative to the housing element 90 about a common compensating rotational axis running perpendicular to the axle drive rotational axis. Furthermore, the axle drive 36 comprises output gears 94, which are rotatable relative to the housing 38 about the axle drive rotational axis and, for example, also relative to the housing element 90, as well as, for example, relative to one another. For example, a first sideshaft can be driven by a first of the output gears 94, in particular by the first of the output gears 94 being connected, in particular permanently, in a rotationally fixed manner to the first sideshaft. For example, the vehicle wheel 12 can be driven by the first sideshaft.For example, a second side shaft can be driven by a second of the output gears 94, in particular by the second of the output gears 94 being connected, in particular permanently, in a rotationally fixed manner to the second side shaft. For example, the second side shaft can drive the vehicle wheel 14. It can be seen that the output gears 94 mesh, in particular permanently, with the compensating gears 92. In the embodiment shown in . Fig. In the embodiment shown in Figure 1, the axle drive 36 is designed as a bevel gear differential, so that the differential gears 92 and the meshing output gears 94 are designed as bevel gears. Alternative designs of the axle drive 36 are conceivable, wherein the axle drive 36 can be designed, for example, as a spur gear differential, in particular as a planetary gear differential. For example, the axle drive 36 is a final drive ratio, also referred to as a final drive ratio, thus, with respect to a torque flow running from the output shaft 72 via the axle drive 36 to the vehicle wheels 12 and 14, the last ratio before the respective vehicle wheel 12, 14.

[0060] The hybrid drive system 10 has a first shifting element S1, by means of which the crankshaft 22 can be connected in a rotationally fixed manner to the first element, thus to the first sun gear 52. Furthermore, in the first embodiment, it is provided that the rotor 30 of the electric machine 26 is permanently coupled, i.e. connected, to the fifth element, thus to the second planet carrier 62, in a torque-transmitting, in particular permanently rotationally fixed, manner, so that the respective second drive torque, which can be provided or is provided by the electric machine 26 via its rotor 30, can be introduced at the fifth element and via the fifth element into the transmission 44, in particular into the first sub-transmission 46.

[0061] In order to be able to realize a particularly compact design as well as particularly advantageous drivability and particularly efficient operation of the hybrid drive system 10, a second shifting element S2 is also provided, by means of which the third element, thus the first ring gear 56, can be connected in a rotationally fixed manner to the housing 38 of the hybrid drive system 10. Furthermore, it is provided that, viewed in the axial direction of the hybrid drive system 10 and thus along the planetary gear set rotation axis 66, the second spur gear stage 80 is arranged on a side SE1 of the first sub-transmission 46, in particular of the second planetary gear set 58, facing away from the first spur gear stage 74, in particular in the axial direction of the hybrid drive system 10.In addition, viewed in the axial direction of the hybrid drive system and thus along the planetary gear set rotation axis 66, the first spur gear stage 74 is arranged on a second side SE2 of the first partial transmission 46, in particular of the first planetary gear set 50, facing away from the second spur gear stage 80 and from the side SE1, also referred to as the first side, in the axial direction of the hybrid drive system 10.

[0062] In total, exactly two planetary gear sets are provided, namely the first planetary gear set 50 and the second planetary gear set 58. The planetary gear sets 50 and 58 are designed as simple planetary gear sets, i.e. as simple planetary gear sets.

[0063] In the first embodiment, the hybrid drive system 10 has a third shifting element S3, by means of which the first input gear 76 is rotationally fixedly connected to the second element, thus to the first planetary carrier 54. Furthermore, the first embodiment provides that the second element (first planetary carrier 54) is rotationally fixedly connected to the fourth element, thus to the second sun gear 60. For this purpose, an eighth shifting element S8 is provided in the first embodiment, by means of which the planetary carrier 54 is rotationally fixedly connected to the sun gear 60.

[0064] Furthermore, a fourth shifting element S4 is provided, by means of which the first ring gear 56 is rotationally fixedly connected to the planet carrier 62 (fifth element). A fifth shifting element S5 is also provided, by means of which the fifth element (second planet carrier 62) is rotationally fixedly connected to the first element (sun gear 52). In the first embodiment, the planet carrier 62 is also rotationally fixedly connected to the crankshaft 22 by means of the fifth shifting element S5, in particular via the first shifting element S1 and thus when the crankshaft 22 is rotationally fixedly connected to the sun gear 52 by means of the shifting element S1.

[0065] In the first embodiment, the electric machine 26, in particular the rotor 30, is arranged coaxially with the planetary gear sets 50 and 58, so that the machine rotation axis 32 coincides with the planetary gear set rotation axis 66.

[0066] In an embodiment not shown in the figures, for example, the electric machine 26 is arranged such that the machine axis of rotation 32 runs parallel to the planetary gear set axis of rotation 66 and is spaced from the planetary gear set axis of rotation 66. In this case, for example, a third spur gear stage is provided which has a third input gear and a third output gear. The third input gear and the third output gear are spur gears. For example, the third input gear is or can be connected in a rotationally fixed manner to the rotor 30, wherein, for example, the third input gear can be permanently rotationally fixedly connected to the rotor 30. Thus, for example, the third input gear is rotatable about the machine axis of rotation 32 relative to the housing 38. The third output gear is arranged, for example, coaxially to the planetary gear sets 50 and 58 and can thus be rotated about the planetary gear set axis of rotation 66 relative to the housing 38.In particular, it is provided that the third input gear meshes, in particular permanently, with the third output gear. For example, the third output gear can be connected or is connected to one of the six elements mentioned, in particular to the fifth element, in a torque-transmitting, in particular rotationally fixed, manner. In particular, it is conceivable that the third output gear is coupled, in particular permanently, to one of the six elements, in particular to the fifth element, in a torque-transmitting, in particular rotationally fixed, manner.Thus, it is conceivable that the electric machine 26, in particular the rotor 30, is or can be connected to one of the six elements, in particular to the fifth element, in a torque-transmitting, in particular rotationally fixed manner, wherein it is particularly conceivable that the rotor 30 and thus the electric machine 26, in particular via the spur gear stage, are permanently coupled, i.e. connected, to one of the six elements, in particular to the fifth element, in a torque-transmitting manner.

[0067] At the Fig. 1 and, for example, in the aforementioned embodiment not shown in the figures and also referred to as the first embodiment, it is conceivable that the electric machine 26 is connected, in particular completely, to the partial transmissions 46 and 48 in the axial direction of the hybrid drive system 10. In an embodiment not shown in the figures, also referred to as the second embodiment, it is conceivable that the electric machine 26 is arranged centrally in the axial direction of the hybrid drive system 10, that is to say, for example, between the spur gear stages 74 and 80 and, for example, at least partially between planetary gear sets 50 and 58, in particular such that the electric machine 26 can be arranged axially overlapping at least one of the planetary gear sets 50 and 58.In particular, it is conceivable that, for example, the planetary gear set 50 and / or the planetary gear set 58 in the second embodiment is at least partially arranged in the rotor 30, so that the rotor 30 surrounds at least a longitudinal region of the planetary gear set 50 and / or the planetary gear set 58 in the circumferential direction of the hybrid drive system, running around the axial direction of the hybrid drive system, in particular completely circumferentially. In this case, for example, the rotor 30 is coupled or can be coupled in a torque-transmitting, in particular rotationally fixed, manner to one of the six elements, in particular to the fifth element, wherein, for example, the rotor 30 can be permanently coupled, i.e. connected, to one of the six elements, in particular to the fifth element, in a torque-transmitting, in particular rotationally fixed, manner.

[0068] Fig. 2 shows a schematic representation of a second embodiment of the hybrid drive system 10. In the second embodiment, the fifth element, thus the second planet carrier 62, can be connected in a rotationally fixed manner to the crankshaft 22 by means of the fifth switching element S5, in particular by bypassing the switching element S1, so that, for example, in an operating state, the planet carrier 62 is connected in a rotationally fixed manner to the crankshaft 22 by means of the switching element S5 while the switching element S1 is open, thus while the switching element S1 is in its decoupling state and thus the crankshaft 22 can be rotated about the planetary gear set axis of rotation 66 relative to the first element (sun gear 52). In the second embodiment, a sixth switching element S6 is also provided, by means of which the first input gear 76 can be connected in a rotationally fixed manner to the first element (sun gear 52).Furthermore, in the second embodiment, it is provided that the rotor 30 of the electric machine 26 is or can be coupled to the first element in a torque-transmitting manner such that the respective second drive torque, which can be provided or is provided by the electric machine 26 with the rotor 30, can be introduced at the first element into the transmission 44, in particular into the first side 46. In the second embodiment, the rotor 30 is permanently coupled, i.e. connected, to the first element in a torque-transmitting manner. In the second embodiment, the aforementioned, in . Fig. 2, a third spur gear stage, designated 96, is provided. The third input gear is designated 98 and, in this case, is permanently connected in a rotationally fixed manner to the rotor 30. The third output gear is designated 100 and, in particular, permanently connected to the third input gear 98. The machine rotation axis 32, about which the rotor 30 and the input gear 98 are rotatable relative to the housing 38, is spaced from the planetary gear set rotation axis 66 and runs parallel to the planetary gear set rotation axis 66. The third output gear 100 is rotatable about the planetary gear set rotation axis 66 relative to the housing 38 and is thus arranged coaxially to the planetary gear sets 50 and 58. In addition, the third output gear 100 is, in particular, permanently connected in a rotationally fixed manner to the first element. Thus, the rotor 30 is permanently connected to the first element via the third spur gear stage 96 in a torque-transmitting manner.

[0069] In a third embodiment of the embodiment not shown in the figures, it is conceivable that, in particular by omitting the switching element S6, a blocking switching element is provided, in particular instead of the switching element S6, by means of which, for example, the second element can be connected to the first element in a rotationally fixed manner.

[0070] Fig. 3 shows a schematic representation of a third embodiment of the hybrid drive system 10. In the third embodiment, the rotor 30 of the electric machine 26 is or can be coupled to the second element in a torque-transmitting manner such that the respective second drive torque that can be provided or is provided by the electric machine 26 via the rotor 30 can be introduced at the second element and thus via the second element into the transmission 44, in particular into the partial transmission 46. In the third embodiment shown in Fig. In the third embodiment shown in Figure 3, the rotor 30 is permanently coupled to the second element (first planet carrier 54) in a torque-transmitting manner. The machine rotation axis 32 runs parallel to the planetary gear set rotation axis 66, with the machine rotation axis 32 being spaced apart from the planetary gear set rotation axis 66.

[0071] Fig.4 shows a schematic representation of a fourth embodiment of the hybrid drive system 10. In the fourth embodiment, the rotor 30 of the electric machine 26 can be connected to the second element and to the third element in a torque-transmitting, in particular rotationally fixed, manner such that the respective second drive torque can be introduced into the transmission 44 at the second element and at the third element. In the fourth embodiment, the first input gear 76 is permanently coupled to the rotor 30 in a partition-transmitting manner, in this case via the third spur gear stage 96. In this case, this is done such that the third output gear 100 is permanently rotationally fixedly connected to the input gear 76. By means of the third shift element S3, the first input gear 76 and the third output gear 100 can be rotationally fixedly connected to the second element.Furthermore, a seventh shifting element S7 is provided, by means of which the first input gear 76 and thereby also the third output gear 100 can be connected in a rotationally fixed manner to the third element. The rotor 30 is permanently coupled to the first input gear 76 in a torque-transmitting manner such that the respective second drive torque, which can be provided or is provided by the electric machine 26 via its rotor 30, can be introduced at the first input gear 76 and via the first input gear 76 into the transmission 44 and, in particular, into the second sub-transmission 48, for example, bypassing the first sub-transmission 46. In the fourth embodiment, the sixth shifting element S6 is not provided.

[0072] In the first, second, third and fourth embodiments, the crankshaft 22 is arranged coaxially with the first partial transmission 46, wherein the output gear 86 is arranged axially between the internal combustion engine 16 and the first partial transmission 46. List of reference symbols 10 Hybrid drive system 12 vehicle wheel 14 vehicle wheel 16 Internal combustion engine 18 Engine block 20 cylinders 22 Crankshaft 24 Crankshaft rotation axis 26 electric machine 28 Stator 30 rotors 32 Machine rotation axis 34 vehicle axle 36 axle drives 38 housings 40 Arrow 42 Arrow 44 gearboxes 46 first partial transmission 48 second partial transmission 50 first planetary gear set 52 first sun gear 54 first planet carrier 56 first ring gear 58 second planetary gear set 60 second sun gear 62 second planet carrier 64 second ring gear 66 Planetary gear set rotation axis 68 first ring gear 70 second ring gear 72 Output shaft 74 first spur gear stage 76 first input gear 78 first output gear 80 second spur gear stage 82 second input gear 84 second output gear 86 Output gear 88 axle drive input gear 90 Housing element 92 differential gear 94 Output gear 96 third spur gear stage 98 third input gear 100 third output gear S1 first switching element S2 second switching element S3 third switching element S4 fourth switching element S5 fifth switching element S6 sixth switching element S7 seventh switching element S8 eighth switching element SE1 page SE2 page

Claims

[1] Hybrid drive system (10) for a motor vehicle, comprising an internal combustion engine (16) having a crankshaft (22), an electric machine (26) having a rotor (30), an axle transmission (36) and a transmission (44) having a first partial transmission (46) and a second partial transmission (48), wherein: - the first partial transmission (46) comprises: o a first planetary gear set (50) having a first element (52), a second element (54) and a third element (56); and o a second planetary gear set (58) having a fourth element (60), a fifth element (62) and a sixth element (64); - the second partial transmission (48) comprises: o an output shaft (72); o a first spur gear stage (74) having a first output gear (78) arranged coaxially with the output shaft (72) and meshing with a first input gear (76) of the first spur gear stage (74) that is connected or connectable in a rotationally fixed manner to the second element (54); and o a second spur gear stage (80) having a second output gear (84) arranged coaxially with the output shaft (72) and meshing with a second input gear (82) of the second spur gear stage (80) which is connected in a rotationally fixed manner to the sixth element (64) and arranged coaxially with the first input gear (76); - an output gear (86) is permanently connected to the output shaft (72) in a rotationally fixed manner and permanently meshes with an axle transmission input gear (88); - a first switching element (S1) is provided which is designed to connect the crankshaft (22) to the first element (52) in a rotationally fixed manner; - the rotor (30) is coupled or can be coupled to one of the six elements (52, 54, 56, 60, 62, 64) in such a way that torques that can be provided by the electric machine (26) via the rotor (30) can be introduced into the transmission (44) at one of the six elements (52, 54, 56, 60, 62, 64); - a second switching element (S2) is provided, which is designed to connect the third element (56) in a rotationally fixed manner to a housing (38) of the hybrid drive system (10); and - viewed in the axial direction of the hybrid drive system (10), the second spur gear stage (80) is arranged on a side (SE1) of the first partial transmission (46) facing away from the first spur gear stage (74), characterized by a sixth switching element (S6) which is designed to connect the first input gear (76) in a rotationally fixed manner to the first element (52). [2] Hybrid drive system (10) according to claim 1, characterized bythat a total of exactly two planetary gear sets are provided, namely the first planetary gear set (50) and the second planetary gear set (58). [3] Hybrid drive system (10) according to claim 1 or 2, characterized by a third switching element (S3) which is designed to connect the first input gear (76) to the second element (54) in a rotationally fixed manner. [4] Hybrid drive system (10) according to one of the preceding claims, characterized by that the second element (54) is or can be connected in a rotationally fixed manner to the fourth element (62). [5] Hybrid drive system (10) according to one of the preceding claims, characterized by a fourth switching element (S4) which is designed to connect the third element (56) to the fifth element (62) in a rotationally fixed manner. [6] Hybrid drive system (10) according to one of the preceding claims, characterized bya fifth switching element (S5) which is designed to connect the fifth element (62) in a rotationally fixed manner to the first element (52) or to the crankshaft (22). [7] Hybrid drive system (10) according to one of the preceding claims, characterized by that the rotor (30) of the electric machine (26) is coupled or can be coupled to the fifth element (62) in such a way that torques that can be provided by the electric machine (26) via the rotor (30) can be introduced into the transmission (44) at the fifth element (62). [8] Hybrid drive system (10) according to one of the preceding claims, characterized by that the rotor (30) of the electric machine (26) is coupled or can be coupled to the first element (52) in such a way that torques that can be provided by the electric machine (26) via the rotor (30) can be introduced into the transmission (44) at the first element (52). [9] Hybrid drive system (10) according to one of the preceding claims, characterized bythat the rotor (30) of the electric machine (26) is coupled or can be coupled to the second element (54) in such a way that torques that can be provided by the electric machine (26) via the rotor (30) can be introduced into the transmission (44) at the second element (54). [10] Hybrid drive system (10) according to one of the preceding claims, characterized by a seventh switching element (S7) which is designed to connect the first input gear (76) in a rotationally fixed manner to the third element (56), wherein the rotor (30) of the electric machine (26) is permanently coupled to the first input gear (76) in such a way that torques which can be provided by the electric machine (26) via the rotor (30) can be introduced into the transmission (44) at the first input gear (76). [11] Hybrid drive system (10) according to one of the preceding claims, characterized bythat the crankshaft (22) is arranged coaxially to the first partial transmission (46), wherein the output gear (86) is arranged axially between the internal combustion engine (16) and the first partial transmission (46).

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