HYBRID DRIVE SYSTEM FOR A MOTOR VEHICLE, AND A MOTOR VEHICLE, IN PARTICULAR A MOTOR CAR

Abstract

A hybrid drive system for a motor vehicle has an internal combustion engine having a drive shaft via which first drive torques can be supplied by the internal combustion engine to drive the motor vehicle. The system also has an electric machine having a rotor via which second drive torques can be supplied by the electric machine to drive the motor vehicle. The system further has an axle drive having an axle drive input gear via which the axle drive can be driven and a gearbox having a first partial gearbox and a second partial gearbox. The first partial gearbox has a first planetary gear set having a first element, a second element, and a third element, as well as a second planetary gear set having a fourth element and a fifth element connected permanently in a rotationally fixed manner to the first element, and a sixth element.

Claims

1-9. (canceled)

10. A hybrid drive system for a motor vehicle, the hybrid drive system comprising: an internal combustion engine having a drive shaft via which first drive torques are suppliable by the internal combustion engine to drive the motor vehicle; an electric machine having a rotor via which second drive torques are suppliable by the electric machine to drive the motor vehicle; an axle drive having an axle drive input gear via which the axle drive is drivable; a gearbox having a first partial gearbox and a second partial gearbox, wherein the first partial gearbox has a first planetary gear set, which has a first element, a second element, and a third element, the first partial gearbox has a second planetary gear set having a fourth element and a fifth element connected permanently in a rotationally fixed manner to the first element and a sixth element, the second partial gearbox has a first spur gear stage, a second spur gear stage, and an output drive shaft, the first spur gear stage has a first output gear wheel, which is arranged coaxially to the output drive shaft and meshes with a first input gear wheel that is connect or is connectable in a rotationally fixed manner to the third element, the second spur gear stage has a second output gear wheel, which is arranged coaxially to the output drive shaft and meshes with a second input gear wheel that is connected or is connectable in a rotationally fixed manner to the sixth element, and the rotor of the electric machine is coupled or couplable to the fourth element in such a way that the respective second drive torque, supplied by the electric machine via the rotor, is introducible at the fourth element into the gearbox; an output drive gear wheel connected permanently in a rotationally fixed manner to the output drive shaft and meshing permanently with the axle drive input gear of the axle drive; a first switching element configured to connect the drive shaft of the internal combustion engine in a rotationally fixed manner to the second element; and a second switching element configured to connect the second element in a rotationally fixed manner to the sixth element, wherein the second spur gear stage is arranged on a side of the first partial gearbox facing away from the first spur gear stage when viewed in an axial direction, wherein the sixth switching element which is configured to connect the second input gear wheel in a rotationally fixed manner to the fifth element.

11. The hybrid drive system of claim 10, wherein the hybrid drive system includes in total exactly two planetary gear sets, wherein the exactly two planetary gear sets are the first planetary gear set and the second planetary gear set.

12. The hybrid drive system of claim 10, further comprising: a third switching element configured to connect the sixth element in a rotationally fixed manner to a housing of the hybrid drive system.

13. The hybrid drive system of claim 12, further comprising: a fourth switching element configured to connect the drive shaft in a rotationally fixed manner to the fourth element.

14. The hybrid drive system of claim 13, further comprising: a fifth switching element configured to connect the sixth element in a rotationally fixed manner to the second input gear wheel.

15. The hybrid drive system of claim 10, wherein the first input gear wheel is connected permanently in a rotationally fixed manner to the third element.

16. The hybrid drive system of claim 10, wherein a rotor wheel of the electric machine, the second spur gear stage, the first partial gearbox, and the first spur gear stage, when viewed in the axial direction, are arranged one after another in following order: the rotor wheel, the second spur gear stage, the first partial gearbox, and the first spur gear stage.

17. The hybrid drive system of claim 10, wherein the drive shaft is arranged coaxially to the first partial gearbox, wherein the output drive gear wheel is arranged axially between the internal combustion engine and the first partial gearbox.

18. A motor vehicle comprising: a hybrid drive system, which comprises an internal combustion engine having a drive shaft via which first drive torques are suppliable by the internal combustion engine to drive the motor vehicle; an electric machine having a rotor via which second drive torques are suppliable by the electric machine to drive the motor vehicle; an axle drive having an axle drive input gear via which the axle drive is drivable; a gearbox having a first partial gearbox and a second partial gearbox, wherein the first partial gearbox has a first planetary gear set, which has a first element, a second element, and a third element, the first partial gearbox has a second planetary gear set having a fourth element and a fifth element connected permanently in a rotationally fixed manner to the first element and a sixth element, the second partial gearbox has a first spur gear stage, a second spur gear stage, and an output drive shaft, the first spur gear stage has a first output gear wheel, which is arranged coaxially to the output drive shaft and meshes with a first input gear wheel that is connect or is connectable in a rotationally fixed manner to the third element, the second spur gear stage has a second output gear wheel, which is arranged coaxially to the output drive shaft and meshes with a second input gear wheel that is connected or is connectable in a rotationally fixed manner to the sixth element, and the rotor of the electric machine is coupled or couplable to the fourth element in such a way that the respective second drive torque, supplied by the electric machine via the rotor, is introducible at the fourth element into the gearbox; an output drive gear wheel connected permanently in a rotationally fixed manner to the output drive shaft and meshing permanently with the axle drive input gear of the axle drive; a first switching element configured to connect the drive shaft of the internal combustion engine in a rotationally fixed manner to the second element; and a second switching element configured to connect the second element in a rotationally fixed manner to the sixth element, wherein the second spur gear stage is arranged on a side of the first partial gearbox facing away from the first spur gear stage when viewed in an axial direction, and wherein the sixth switching element which is configured to connect the second input gear wheel in a rotationally fixed manner to the fifth element.

Description

BRIEF DESCRIPTION OF THE DRAWING FIGURES

[0040] The drawing shows in:

[0041] FIG. 1 a schematic representation of a first embodiment of a hybrid drive system for a motor vehicle; and

[0042] FIG. 2 a schematic representation of a second embodiment of the hybrid drive system.

[0043] In the figures, identical or functionally identical elements are provided with the same reference signs.

DETAILED DESCRIPTION

[0044] FIG. 1 shows a schematic representation of a first embodiment of a hybrid drive system 10 for a motor vehicle, also referred to as a vehicle. The motor vehicle is preferably a motor car. The motor vehicle has, for example, at least or exactly two vehicle axles arranged one behind the other in the vehicle longitudinal direction. The respective vehicle axle is also simply referred to as an axle and has at least or exactly two vehicle axles, wherein the vehicle wheels are ground contact elements of the motor vehicle. The hybrid drive system 10 is assigned to one, in particular to exactly one, of the axles, so that the vehicle wheels of the vehicle axle to which the hybrid drive system 10 is assigned can be driven by means of the hybrid drive system 10. The vehicle wheels, able to be driven by means of the hybrid drive system 10, of the vehicle axle to which the hybrid drive system 10 is assigned are represented particularly schematically in FIG. 1 and are labelled 12 and 14.

[0045] The hybrid drive system 10 has an internal combustion engine 16, which is also referred to as an internal combustion machine, motor, or combustion engine. The internal combustion engine 16 has a cylinder housing 18, also referred to as an engine block, which has multiple cylinders 20. In fueled operation of the internal combustion engine, combustion processes take place in the cylinders 20. For example, the internal combustion engine 16 is designed as a reciprocating piston engine. The internal combustion engine 16 has a drive shaft 21, designed, for example, as a crankshaft, which can be rotated around a drive shaft rotational axis relative to the cylinder housing 18. The internal combustion engine 16 can supply first drive torques via the drive shaft 21 to drive the vehicle wheels 12 and 14 and thus to drive the motor vehicle.

[0046] The hybrid drive system 10 furthermore comprises an electric machine 22, which has a stator 24 and a rotor 26. The rotor 26 can be driven by means of the stator 24 and thus can be rotated around a machine rotational axis relative to the stator 24. Furthermore, the hybrid drive system 10 comprises a housing 28 represented particularly schematically in FIG. 1, wherein the drive shaft 21 can be rotated around the drive shaft rotational axis and the rotor 26 can be rotated around the machine rotational axis relative to the housing 28. The electric machine 22 can supply second drive torques via the rotor 26 to drive the vehicle wheels 12 and 14 and thus to drive the motor vehicle.

[0047] Furthermore, the hybrid drive system 10 has an axle drive 30, designed as a differential gearbox and also simply referred to as a differential, via which the vehicle wheels 12 and 14 can be driven by the electric machine 22 and by the internal combustion engine 16. In the first embodiment, the axle drive 30 is designed, for example, as a bevel gear differential. The axle drive 30 has an axle drive housing 32 which is designed here, for example, as a so-called differential cage. Furthermore, the axle drive 30 has an axle drive input gear 34 which is connected, in particular permanently, in a rotationally fixed manner to the axle drive housing 32. Thus, the axle drive housing 32 and the axle drive input gear 34 can be rotated around an axle drive rotational axis relative to the housing 28. As illustrated in FIG. 1 by arrows 36, the axle drive 30 can distribute or transmit a respective third drive torque, also referred to as a third torque and resulting from the respective first drive torque and/or from the respective second drive torque, onto the vehicle wheels 12 and 14, whereby the vehicle wheels 12 and 14 can be driven. The axle drive 30 has pinion gears 38, designed here as bevel gears, which can be rotated with the axle drive housing 32 around the axle drive rotational axis relative to the housing 28. Furthermore, the pinion gears 38 can rotate around a pinion gear rotational axis, which extends perpendicular to the axle drive rotational axis. The pinion gears 38 mesh, in particular permanently, with side gears 40 of the axle drive 30. The respective pinion gear 38 can be rotated relative to the axle drive housing 32 around the pinion gear rotational axis, which extends perpendicular to the axle drive rotational axis. The respective side gear 40 can be rotated around the axle drive rotational axis relative to the housing 28 and also relative to the axle drive housing 32. The respective side gear 40 is connected, in particular permanently, in a rotationally fixed manner to a respective side shaft 42, whereby the respective vehicle wheel 12, 14 can be driven by the respective side shaft 42.

[0048] The hybrid drive system 10 furthermore comprises a gearbox 44, also referred to as a main gearbox, which has a first partial gearbox 46 and a second partial gearbox 48. The first partial gearbox 46 has a first planetary gear set 50 and a second planetary gear set 52, which are arranged in this case coaxially to each other. The first planetary gear set 50 has a first element 54 designed as a first sun gear, a second element 56 designed as a first planetary carrier, and a third element 58 designed as a first ring gear. Furthermore, the first planetary gear set 50 has first planetary gears 60 that are rotatably mounted on the second element 56 (first planetary carrier) and simultaneously mesh with the first element 54 (first sun gear) as well as with the third element 58 (first ring gear). The second planetary gear set 52 has a fourth element 62 designed as a second sun gear, a fifth element 64 designed as a second planetary carrier, and a sixth element 66 designed as a second ring gear. Furthermore, the planetary gear set 52 has second planetary gears 68 that are rotatably mounted on the fifth element 64 (second planetary carrier) and simultaneously mesh with the fourth element 62, designed as the second sun gear, as well as with the sixth element 66 (second ring gear). In the first embodiment, the first sun gear is the first element 54, the planetary carrier is the second element 56, and the first ring gear is the third element 58. Furthermore, the second sun gear is the fourth element 62, the second planetary carrier is the fifth element 64, and the second ring gear is the sixth element 66. The first element 54 (first sun gear) is permanently connected in a rotationally fixed manner to the fifth element 64 (second planetary carrier).

[0049] The second partial gearbox 48 has a first spur gear stage 70. Furthermore, the second partial gearbox 48 comprises an output drive shaft 72 that can be rotated around an output drive shaft rotational axis relative to the housing 28. Particularly when the respective element is not connected to the housing 28 in a rotationally fixed manner, the respective element can be rotated around a planetary gear set rotational axis, relative to the housing 28. The planetary gear set rotational axis is a planetary gear set rotational axis common to the planetary gear sets 50 and 52, since the planetary gear sets 50 and 52 are arranged coaxially to each other.

[0050] In the first embodiment, the internal combustion engine 16 or the drive shaft 21 is arranged coaxially to the planetary gear sets 50 and 52, so that the drive shaft rotational axis coincides with the planetary gear set rotational axis. The output drive shaft 72 is arranged axially parallel to the planetary gear sets 50 and 52 and axially parallel to the drive shaft 21, so that the output drive shaft rotational axis extends parallel to the planetary gear set rotational axis and parallel to the drive shaft rotational axis and is spaced apart from the planetary gear set rotational axis and from the drive shaft rotational axis. In the first embodiment, the internal combustion engine 16 or the drive shaft 21 is arranged coaxially to the planetary gear sets 50 and 52, so that the drive shaft rotational axis coincides with the planetary gear set rotational axis. The electric machine 22, i.e., its rotor 26, is arranged axially parallel to the output drive shaft 72, axially parallel to the planetary gear sets 50 and 52 and axially parallel to the internal combustion engine 16, so that the machine rotational axis extends parallel to the output drive shaft rotational axis, parallel to the planetary gear set rotational axis, and parallel to the drive shaft rotational axis and is spaced apart from the output drive shaft rotational axis, from the planetary gear set rotational axis and from the drive shaft rotational axis. In the present case, the rotational axis of the axle drive also runs parallel to the machine rotational axis, parallel to the output drive shaft rotational axis, parallel to the planetary gear set rotational axis and parallel to the drive shaft rotational axis and is spaced apart from these.

[0051] The first spur gear stage 70 has a first output gear wheel 74 arranged coaxially to the output drive shaft 72. In the first embodiment, the output gear wheel 74 is connected, in particular permanently, in a rotationally fixed manner to the output drive shaft 72. Furthermore, it is conceivable that the output gear wheel 74 is arranged on the output drive shaft 72. The first spur gear stage 70 furthermore comprises a first input gear wheel 76 which meshes, in particular permanently, with the first output gear wheel 74. In the first embodiment, the first input gear wheel 76 is connected, in particular permanently, in a rotationally fixed manner to the third element 58 (first ring gear).

[0052] Furthermore, the rotor 26 is coupled to the fourth element 62 (second sun gear), in particular permanently, in a torque-transmitting manner, in such a way that the respective second drive torque, supplied or able to be supplied by the electric machine 22 via its rotor 26, or a torque resulting therefrom can be introduced at the fourth element 62 (second sun gear) into the gearbox 44. The hybrid drive system 10 furthermore comprises an output drive gear wheel 78 connected permanently in a rotationally fixed manner to the output drive shaft 72 and thus is arranged coaxially to the output drive shaft 72 and also coaxially to the output gear wheel 74. The output drive gear wheel 78 meshes permanently with the axle drive input gear 34 of the axle drive 30, the axle drive input gear 34 of which can be, for example, a gear wheel, in particular a crown wheel.

[0053] The hybrid drive system 10 has a first switching element 80 by means of which the drive shaft 21 of the internal combustion engine 16 can be connected in a rotationally fixed manner to the second element 56 (first planetary carrier). Furthermore, the hybrid drive system 10 comprises a second switching element 82 by means of which the second element 56 (first planetary carrier) can be connected in a rotationally fixed manner to the sixth element 66 (second ring gear).

[0054] The hybrid drive system 10 has in total exactly two planetary gear sets, specifically the planetary gear sets 50 and 52.

[0055] The second partial gearbox 48 has a second spur gear stage 86 comprising a second output gear wheel 88. The second output gear wheel 88 is connected, in particular permanently, in a rotationally fixed manner to the output drive shaft 72. The spur gear stage 86 furthermore comprises a second input gear wheel 90 which meshes, in particular permanently, with the second output gear wheel 88. In the first embodiment, the second input gear wheel 90 can be connected in a rotationally fixed manner to the sixth element 66 (second ring gear). Furthermore, in the first embodiment, the second input gear wheel 90 can be connected in a rotationally fixed manner to the fifth element 64 (second planetary carrier).

[0056] In order to be able to realize a particularly advantageous drive in a particularly space-efficient manner, the second spur gear stage 86 is arranged on a side S of the partial gearbox 46 facing away from the first spur gear stage 70, i.e., pointing away from the first spur gear stage 70, when viewed in an axial direction and thus along the planetary gear set rotational axis, wherein in the first embodiment, the side S is a side of the second planetary gear set 52, in particular in that in a viewing direction extending parallel to the planetary gear set rotational axis or coinciding with the planetary gear set rotational axis and pointing away from the internal combustion engine 16, the planetary gear set 50 adjoins the internal combustion engine 16, the planetary gear set 52 adjoins the planetary gear set 50, and the spur gear stage 86 adjoins the planetary gear set 52, i.e., the planetary gear set 52 is arranged between the planetary gear set 50 and the spur gear stage 86. In other words, it is provided that the second spur gear stage 86 is arranged on the side S of the first partial gearbox 46 facing away, i.e., pointing away, from the first spur gear stage 70 in an axial direction of the respective planetary gear set 50, 52, wherein the axial direction of the respective planetary gear set coincides with the planetary gear set rotational axis.

[0057] The hybrid drive system 10 comprises a third switching element 84 by means of which the sixth element 66 (second ring gear) can be connected in a rotationally fixed manner to the housing 28. A fourth switching element 92 is also provided, by means of which the drive shaft 21 can be connected in a rotationally fixed manner to the fourth element (second sun gear 62). The hybrid drive system 10 furthermore comprises a fifth switching element 94 by means of which the second input gear wheel 90 can be connected in a rotationally fixed manner to the sixth element 66 (second ring gear) or vice versa. Furthermore, the hybrid drive system 10 comprises a sixth switching element 96 by means of which the second input gear wheel 90 can be connected in a rotationally fixed manner to the fifth element 6 (second planetary carrier) or vice versa.

[0058] In the first embodiment, the switching elements 80, 82, 84, 92, 96, and 94 are arranged in succession, i.e., one after another, when viewed in an axial direction of the respective planetary gear set 50, 52 and thus along the planetary gear set rotational axis, in the following order: the fourth switching element 92the first switching element 80the second switching element 82the third switching element 84the sixth switching element 96the fifth switching element 94. Furthermore, in the first embodiment, the electric machine 22 is arranged on the side S of the partial gearbox 46, also referred to as a first side. The internal combustion engine 16, however, is arranged on a second side S2 of the first partial gearbox 46, facing away from the electric machine 22 and the first side S when viewed in an axial direction of the respective planetary gear set 50, 52 and thus along the planetary gear set rotational axis, so that the planetary gear sets 50, 52, i.e., the first partial gearbox 46, is arranged between the internal combustion engine 16 of the electric machine 22, in the axial direction of the respective planetary gear set 50, 52. In the first embodiment, the second side S2 is a side of the planetary gear set 50, since the planetary gear set 50 is arranged between the planetary gear set 52 and the internal combustion engine 16 when viewed along the viewing direction.

[0059] The hybrid drive system 10, in particular the rotor 26, has a rotor wheel 98, which is, in particular, a further gear wheel. In this case, the rotor 26 is coupled via the rotor wheel 98, in particular permanently, in a torque-transmitting manner to the fourth element (second sun gear) 62. A gear wheel 100 corresponding to the rotor wheel 98 is provided that can be connected in a torque-transmitting, in particular rotationally fixed, manner to the fourth element 62. In the first embodiment, however, the gear wheel 100 is connected, in particular permanently, in a rotationally fixed manner to the fourth element 62. Furthermore, the gear wheel 100 meshes, in particular permanently, with the rotor wheel 98, so that the rotor 26 is coupled via the rotor wheel 98 and the gear wheel 100 permanently in a torque-transmitting manner to the fourth element 62. For example, the rotor wheel 98 and the gear wheel 100 are spur gears, so that, for example, the rotor wheel 98 and the gear wheel 100 form a third spur gear stage, in particular provided in addition to the spur gear stages 70 and 86.

[0060] In the first embodiment, the switching element 96, for example, is a form-fit switching element, in particular a claw coupling, wherein it can be provided that the remaining, other switching elements 80, 82, 84, 92, and 94 can be friction-fit switching elements, in particular friction couplings and especially disc couplings.

[0061] FIG. 2 shows a second embodiment of the hybrid drive system 10. In the second embodiment, the switching elements 80, 82, 84, 92, 94, and 96 are arranged following each other, i.e., one after another, viewed in an axial direction of the respective planetary gear set 50, 52 in the following order: the first switching element 80the fourth switching element 92the fifth switching element 94the sixth switching element 96the third switching element 84the second switching element 82. In the second embodiment, the internal combustion engine 16 and the electric machine 22 are arranged on the same side S2 of the first partial gearbox 46, the second side S2 of which is facing away from the first side S in an axial direction of the respective planetary gear set 50, 52 and thus in a direction opposing the viewing direction, i.e., pointing away from the first side S. In the second embodiment, the side S is a side of the planetary gear set 50, and the side S2 is a side of the planetary gear set 52, since in the second embodiment the planetary gear set 50 adjoins the planetary gear set 52, in the viewing direction pointing away from the internal combustion engine 16 and towards the partial gearbox 46, and extending parallel to the planetary gear set rotational axis or coinciding with the planetary gear set rotational axis, so that the planetary gear set 52 is arranged between the planetary gear set 50 and the internal combustion engine 16, viewed in an axial direction.

[0062] In the first embodiment, it is provided that the first partial gearbox 46 adjoins the first spur gear stage 70 in the viewing direction and that the second spur gear stage 86 adjoins the first partial gearbox 46 in the viewing direction. In the second embodiment, it is provided that the partial gearbox 46 adjoins the second spur gear stage 86 in the viewing direction and that the first spur gear stage 70 adjoins the partial gearbox 46 in the viewing direction. Furthermore, it is provided in the second embodiment that the switching elements 80 and 92 are each arranged at least partially axially overlapping the electric machine 22.

[0063] As in the first embodiment, in the second embodiment the drive shaft 21 is arranged coaxially to the first partial gearbox 46, i.e. to the planetary gear sets 50 and 52. Both in the first embodiment as well as in the second embodiment, the output drive gear wheel 78 is arranged axially between the internal combustion engine 16 and the first partial gearbox 46.

[0064] Although the invention has been illustrated and described in detail by way of preferred embodiments, the invention is not limited by the examples disclosed, and other variations can be derived from these by the person skilled in the art without leaving the scope of the invention. It is therefore clear that there is a plurality of possible variations. It is also clear that embodiments stated by way of example are only really examples that are not to be seen as limiting the scope, application possibilities or configuration of the invention in any way. In fact, the preceding description and the description of the figures enable the person skilled in the art to implement the exemplary embodiments in concrete manner, wherein, with the knowledge of the disclosed inventive concept, the person skilled in the art is able to undertake various changes, for example, with regard to the functioning or arrangement of individual elements stated in an exemplary embodiment without leaving the scope of the invention, which is defined by the claims and their legal equivalents, such as further explanations in the description.

LIST OF REFERENCE SIGNS

[0065] 10 hybrid drive system [0066] 12 vehicle wheel [0067] 14 vehicle wheel [0068] 16 internal combustion engine [0069] 18 cylinder housing [0070] 20 cylinder [0071] 21 drive shaft [0072] 22 electric machine [0073] 24 stator [0074] 26 rotor [0075] 28 housing [0076] 30 axle drive [0077] 32 axle drive housing [0078] 34 axle drive input gear [0079] 36 arrow [0080] 38 pinion gear [0081] 40 side gear [0082] 42 side shaft [0083] 44 gearbox [0084] 46 first partial gearbox [0085] 48 second partial gearbox [0086] 50 first planetary gear set [0087] 52 second planetary gear set [0088] 54 first element [0089] 56 second element [0090] 58 third element [0091] 60 first planetary gear [0092] 62 fourth element [0093] 64 fifth element [0094] 66 sixth element [0095] 68 second planetary gear [0096] 70 first spur gear stage [0097] 72 output drive shaft [0098] 74 first output gear wheel [0099] 76 first input gear wheel [0100] 78 output drive gear wheel [0101] 80 first switching element [0102] 82 second switching element [0103] 84 third switching element [0104] 86 second spur gear stage [0105] 88 second output gear wheel [0106] 90 second input gear wheel [0107] 92 fourth switching element [0108] 94 fifth switching element [0109] 96 sixth switching element [0110] 98 rotor wheel [0111] 100 gear wheel [0112] S first side [0113] S2 second side