Hybrid powertrain with five interconnected planetary gear sets

Abstract

Hybrid powertrain (10), comprising: an internal combustion engine (12); a multi-speed transmission (14) comprising the following: a drive element (17); a drive element (19); a first planetary gear set (20), a second planetary gear set (30), a third planetary gear set (40), a fourth planetary gear set (50) and a fifth planetary gear set (60) each with a sun gear element (22, 32, 42, 52, 62), a planet carrier element (26, 36, 46, 56, 66) and a ring gear element (24, 34, 44, 54, 64); a first connecting element (70) that continuously connects the sun gear element (22) of the first planet gear set (20) to the sun gear element (32) of the second planet gear set (30); a second connecting element (72) that continuously connects the planet carrier element (26) of the first planet gear set (20) to the ring gear element (54) of the fourth planet gear set (50); a third connecting element (74) that continuously connects the ring gear element (34) of the second planet gear set (30) to the sun gear element (42) of the third planet gear set (40); a fourth connecting element (76) that continuously connects the planet carrier element (66) of the fifth planet gear set (60) to the sun gear element (22) of the first planet gear set (20); seven torque transmission devices (81, 82, 83, 84, 85, 86, 87) configured to connect the first planetary gear set (20), the second planetary gear set (30), the third planetary gear set (40), the fourth planetary gear set (50) and the fifth planetary gear set (60) together in combinations of at least four to produce at least ten forward gear ratios and at least one reverse gear ratio between the drive element (17) and the driven element (19); and an electric motor-generator (90) connected to the multi-speed transmission (14).

Description

[0001] The present description relates to a hybrid powertrain comprising a drive motor and a transmission configured to provide at least ten forward gear ratios and at least one reverse gear ratio in a hybrid transmission architecture.

[0002] Internal combustion engines, especially those of the reciprocating type, currently power most vehicles. Such engines are relatively efficient, compact, lightweight, and inexpensive mechanisms for converting highly concentrated energy in the form of fuel into useful mechanical power.

[0003] The wide range of demands placed on internal combustion engines by vehicles increases fuel consumption and emissions beyond the ideal scenario for such engines. Typically, a vehicle is powered by such an engine, which is started from cold by a small electric motor and relatively small electric storage batteries, and then quickly brought under the load of drive and accessory equipment. Such an engine also operates over a wide speed and load range, typically at an average of about one-fifth of its maximum output power.

[0004] A vehicle transmission delivers mechanical power from an internal combustion engine to the rest of a drive system, such as fixed final drive gearboxes, axles, and wheels. A mechanical transmission allows for some flexibility in engine operation, typically through a selection of five or six different drive ratios, a neutral setting that allows the engine to power accessories with the vehicle when stationary, and clutches or a torque converter for smooth transitions between drive ratios and for starting the vehicle from a standstill with the engine turning. The transmission gear selection allows the engine's power to be delivered to the rest of the drive system with a torque-increasing / speed-reducing ratio, a torque-reduction / speed-multiplying ratio known as overdrive, or with a reverse ratio.

[0005] Hybrid systems can improve a vehicle's fuel economy in a variety of ways. For example, the engine can be switched off at idle, during periods of deceleration and braking, and during periods of low speed or light load to eliminate efficiency losses due to engine resistance. Energy recovered during braking (through regenerative braking) or energy stored by the engine when it acts as a generator during operation is utilized during these engine-off periods. The temporary demand for engine torque or power is supplemented by the engine while operating in electric mode, allowing the engine to be "downsized" without compromising the vehicle's apparent performance. Additionally, the engine can be operated at or near its optimal efficiency point for a given power demand.The motor-generator is capable of capturing the vehicle's kinetic energy during braking, which is used to extend engine shutdown time, supplement engine torque or power, and / or operate at lower engine speeds or supplement the accessory power supply. Additionally, the motor / generator is highly efficient at generating accessory power, and electrical energy from the battery serves as an available torque reserve, enabling operation at a relatively low numerical speed ratio of the transmission.

[0006] DE 10 2015 214 217 A1 describes a multi-stage planetary gear unit for a vehicle with a housing, wherein a first shaft is provided as the input and a second shaft as the output, wherein four planetary gear sets and seven further shafts are provided, wherein five switching elements are provided, and wherein three of the switching elements are closed to achieve each gear ratio. An additional fifth planetary gear set is provided, which is connected via an additional switching element such that at least ten forward gears and at least one reverse gear can be achieved by actuating the switching elements, that the sun gear of the fifth planetary gear set is connectable to or connected with the first shaft or the third shaft, that the planet carrier of the fifth planetary gear set is connected to the planet carrier of the third planetary gear set, and that the ring gear of the fifth planetary gear set is connectable to or connected with the second shaft.

[0007] DE 10 2015 118 735 A1 describes a planetary gear unit of an automatic transmission for a vehicle.The planetary gear set comprises: an input shaft which receives torque from a motor, an output shaft which outputs a modified torque, a first planetary gear set which has a first, a second and a third rotating element, a second planetary gear set which has a fourth, a fifth and a sixth rotating element, a compound planetary gear set which is formed by combining a third and a fourth planetary gear set and which has a seventh, an eighth, a ninth and a tenth rotating element, a fifth planetary gear set which has an eleventh, a twelfth and a thirteenth rotating element, and six friction elements which are arranged between at least one rotating element among the thirteen rotating elements and another rotating element or the input shaft or between at least one rotating element among the thirteen rotating elements and a gear housing.

[0008] DE 10 2016 224 739 A1 describes a transmission with five planetary gear sets. A second element of the second gear set forms a transmission input shaft, a second element of the fourth planetary gear set a transmission output shaft. A first element of the first gear set is connected to a third element of the fifth gear set and can be locked via a first switching element. A second element of the first gear set is connected to a third element of the fourth gear set. A third element of the first gear set can be locked via a second switching element. A first element of the fourth gear set can be connected to a second element of the second gear set via a third switching element. A third element of the second gear set, a first element of the third gear set, and a first element of the fifth gear set are connected to each other and can be connected to the first element of the fourth gear set via a fifth switching element.One element of the fourth wheelset is connected to an element of the third wheelset, while another element of the fourth wheelset can be connected to another element of the third wheelset via a fourth switching element. A first element of the second wheelset is connected to a second element of the fifth wheelset and can be locked in place via a sixth switching element.

[0009] It can be considered an objective to specify a hybrid powertrain with a low numerical speed ratio of the transmission. This objective is achieved by the subject matter of claim 1.

[0010] This description details a hybrid arrangement for a rear-wheel drive transmission with at least ten speed ratios. The hybrid powertrain disclosed herein enables a high starting ratio to reduce engine torque requirements. This high starting ratio can be used for friction starting with a low battery charge. Starting ratios for the electric motor starting device (EMLD) are also available, but with a lower starting ratio.

[0011] According to the invention, the hybrid powertrain comprises an internal combustion engine and a multi-speed transmission coupled to the internal combustion engine. The multi-speed transmission includes a drive element, an output element, and first, second, third, fourth, and fifth planetary gear sets, each with a sun gear element, a planet carrier element, and a ring gear element. The multi-speed transmission further includes a first connecting element that continuously connects the sun gear element of the first planetary gear set to the sun gear element of the second planetary gear set. The multi-speed transmission also includes a second connecting element that continuously connects the planet carrier element of the first planetary gear set to the ring gear element of the fourth planetary gear set. Finally, the multi-speed transmission includes a third connecting element that continuously connects the ring gear element of the second planetary gear set to the sun gear element of the third planetary gear set.The multi-speed transmission further includes a fourth connecting element that continuously connects the planet carrier element of the fifth planetary gear set to the sun gear element of the first planetary gear set. The multi-speed transmission further includes seven torque transmission devices configured to selectively connect the first, second, third, fourth, and fifth planetary gear sets in combinations of at least four to establish at least ten forward gear ratios and at least one reverse gear ratio between the input element and the output element. The hybrid powertrain includes an electric motor-generator connected to the multi-speed transmission.

[0012] In one embodiment, the hybrid drive train includes an axle drive mechanism that is continuously connected to the planet carrier element of the fourth planet gear set, and wherein the axle drive mechanism is coupled to the output element.

[0013] In one embodiment, an arrangement for use that connects an internal combustion engine and a transmission comprises the following: a planetary gear set with a fixed ring gear. The sun gear is attached to an electric motor. The carrier of the gear set is connected to an element of the transmission. The transmission is shown as one embodiment of this arrangement, but it can also be used with other transmissions. The internal combustion engine is connected to the electric motor and the sun gear by a coupling. The internal combustion engine is also connected to another point within the transmission by a further coupling. The transmission is shown as one embodiment of this arrangement, but it can be used with other transmissions. It can additionally include a coupling for anchoring the fifth gear set, thus eliminating the need for power from the engine.The arrangement further comprises a plurality of connecting elements, and at least one of the plurality of connecting elements is connected to the planetary gear set.

[0014] In one embodiment, the hybrid drivetrain further comprises a fifth connecting element that continuously connects the electric motor-generator to the sun gear element of the fifth planetary gear set. In another embodiment, the hybrid drivetrain also includes a transmission housing. In one embodiment, a first of the seven torque transmission devices can selectively connect the ring gear element of the first planetary gear set to the transmission housing. In another embodiment, a second of the seven torque transmission devices can selectively connect the second ring gear element of the second planetary gear set to a J-node. In another embodiment, a third of the seven torque transmission devices can selectively connect the planet carrier element of the third planetary gear set to the J-node. In another embodiment, the third torque transmission device can be replaced by a fixed connection.As such, the planetary gear assembly in this embodiment includes a sixth connecting element (e.g., a sixth connecting shaft) that continuously connects the third planet carrier element of the third planetary gear set to the J-node. In one embodiment, a fourth of the seven torque transmission devices can selectively connect the ring gear element of the third planetary gear set to the planet carrier element of the second planetary gear set. In one embodiment, a fifth of the seven torque transmission devices can selectively connect the planet carrier element of the first planetary gear set to the J-node. In one embodiment, the sixth of the torque transmission devices selectively connects an engine crankshaft of the internal combustion engine to the second planet carrier element of the second planetary gear set.In one embodiment, a seventh torque transmission device can selectively connect the electric motor-generator and the sun gear element of the first planetary gear set to the crankshaft of the internal combustion engine. In another embodiment, an eighth torque transmission device can selectively connect either the sun gear element or the planet carrier element of the fifth planetary gear set to the stationary component in order to selectively anchor the electric motor-generator. Fig. Figure 1 is a schematic representation of a drive train with planetary gear sets and torque transmission devices. Fig. 2 is a truth table and a diagram that shows some of the operating characteristics of the device in Fig. 1 represents the powertrain shown. Fig. Figure 3 is a schematic representation of a drive train. Fig. Figure 4 is a schematic representation of a drive train. Fig. Figure 5 is a schematic representation of a powertrain.

[0015] Referring to the drawings, in Fig. Figure 1 shows a hybrid powertrain 10 comprising an internal combustion engine 12, a multi-speed transmission 14, an axle drive mechanism 16, an electric motor-generator 90 connected to the multi-speed transmission 14, and a mechanical pump 92 connected to the multi-speed transmission 14. The electric motor-generator 90 is anchored (i.e., coupled to a stationary component SC, such as a transmission housing 61). The engine 12 can be powered by various types of fuel to improve the efficiency and fuel consumption of a particular application. Such fuels can be, for example, gasoline, diesel, ethanol, dimethyl ether, etc. The mechanical pump 92 can be located at a first position L1 or a second position L2 and can be driven by: 1) the internal combustion engine 12; 2) the electric motor-generator 90; or a combination of both (whichever rotates faster).The hybrid powertrain 10 does not include a torque converter.

[0016] The multi-speed transmission 14 includes a drive element 17 (i.e., input shaft), a planetary gear assembly 18, and an output element 19, which is continuously connected to the axle drive mechanism 16. The planetary gear assembly 18 includes five planetary gear sets (i.e., a first planetary gear set 20, a second planetary gear set 30, a third planetary gear set 40, a fourth planetary gear set 50, and a fifth planetary gear set 60).

[0017] The arrangement 18, which connects the internal combustion engine 12 and a transmission 14, includes: a planetary gear set 60 with a fixed ring gear 64. The sun gear 62 is attached to an electric motor 90. The carrier of the planetary gear set 60 is connected to an element of the transmission 18. The transmission 18 is shown as one embodiment, but can also be used in other transmissions. The internal combustion engine 12 is connected to the electric motor 90 and the sun gear 62 by the coupling 87. The internal combustion engine 12 is also connected to another location within the transmission by the coupling 86. The transmission 18 is shown as one embodiment, but this arrangement can be used in other transmissions. An additional coupling for securing the fifth gear set can be provided, thus eliminating the need for power from the motor 90.

[0018] The first planetary gear set 20 comprises a first sun gear element 22, a first ring gear element 24 and a first planet carrier element 26. The first planet carrier element 26 includes a plurality of first pinion gears 27, which are rotatably mounted on a first carrier element 29 and are arranged in a meshing relationship with both the first sun gear element 22 and the first ring gear element 24.

[0019] The second planetary gear set 30 includes a second sun gear element 32, a second ring gear element 34, and a second planet carrier element 36. The second planet carrier element 36 includes a plurality of second pinion gears 37, which are rotatably mounted on a second carrier element 39 and are arranged in a meshing relationship with both the second ring gear element 34 and the second sun gear element 32.

[0020] The third planetary gear set 40 includes a third sun gear element 42, a third ring gear element 44, and a third planet carrier element 46. The third planet carrier element 46 includes a plurality of third pinion gears 47, which are mounted on a third carrier element 49 and arranged in a meshing relationship with both the third ring gear element 44 and the third sun gear element 42.

[0021] The fourth planetary gear set 50 includes a fourth sun gear element 52, a fourth ring gear element 54, and a fourth planet carrier element 56. The fourth planet carrier element 56 includes a plurality of fourth pinion gears 57, which are mounted on a carrier element 59 and arranged in a meshing relationship with both the fourth ring gear element 54 and the fourth sun gear element 52.

[0022] The fifth planetary gear set 60 comprises a fifth sun gear element 62, a fifth ring gear element 64, and a fifth planet carrier element 66. The fifth planet carrier element 66 includes a plurality of fifth pinion gears 67, which are mounted on a carrier element 69 and arranged in a meshing ratio with both the fifth ring gear element 64 and the fifth sun gear element 62. The fifth ring gear element 64 is anchored. That is, the fifth ring gear element 64 is attached to the stationary component SC (e.g., the gearbox housing 61). As such, the fifth ring gear element 64 remains stationary relative to the other elements of the fifth planetary gear set 60. The fifth planetary gear set 60 provides a high starting ratio for the electric motor-generator 90, thereby reducing the torque requirement for the electric motor-generator 90.

[0023] The drive element 17 (i.e., the input shaft) is continuously connected to the second planet carrier element 36 of the second planet gear set 30. The output element 19 is continuously connected to the fourth planet carrier element 56 of the fourth planet gear set 50.

[0024] A first connecting element 70 (e.g., a first connecting shaft) continuously connects the first sun gear element 22 of the first planet gear set 20 to the second sun gear element 32 of the second planet gear set 30. A second connecting element 72 (e.g., a second connecting shaft) continuously connects the first planet carrier element 26 of the first planet gear set 20 to the fourth ring gear element 54 of the fourth planet gear set 50. A third connecting element 74 (e.g., a third connecting shaft) continuously connects the second ring gear element 34 of the second planet gear set 30 to the third sun gear element 42 of the third planet gear set 40. A fourth connecting element 76 (e.g., a fourth connecting shaft) continuously connects the fifth planet carrier element 66 of the fifth planet gear set 60 to the first sun gear element 22 of the first planet gear set 20. A fifth connecting element 78 (e.g.,a fifth coupling shaft) continuously connects the electric motor-generator 90 to the fifth sun gear element 62 of the fifth planetary gear set 60.

[0025] The planetary gear assembly 18 also includes at least seven torque transmission devices (e.g., a first torque transmission device 81, a second torque transmission device 82, a third torque transmission device 83, a fourth torque transmission device 84, a fifth torque transmission device 85, a sixth torque transmission device 86, and a seventh torque transmission device 87), each having an engaged or ON position to transmit torque and a disengaged or OFF position in which no torque is transmitted. The torque transmission devices are configured to selectively connect the elements of the planetary gear sets to the stationary component SC or to elements of other planetary gear sets.The seven torque transmission devices (or more) are connected in combinations of at least four to produce at least ten forward speed ratios and at least one reverse speed ratio between the drive element 17 and the output element 19.

[0026] With reference to the Fig. 1 and Fig. 2 connects the first torque transmission device 81, such as the brake, the first ring gear element 24 of the first planetary gear set 20 to the stationary component, such as the gearbox housing 61. The first torque transmission device 81 is a stationary torque transmission device, commonly referred to as a brake or reaction clutch.

[0027] The second torque transmission device 82, like a clutch, selectively connects the second ring gear element 34 of the second planetary gear set 30 to a J-node 91 (i.e., a freewheel node). The term "J-node" refers to a component of the planetary gear assembly 18 that is not connected to gears, but only to rotary couplings. The second torque transmission device 82 is a rotational torque transmission device, commonly referred to as a clutch.

[0028] The third torque transmission device 83, such as the clutch, selectively connects the third planet carrier element 46 of the third planet gear set 40 to J-nodes 91. The third torque transmission device 83 also selectively connects the first planet carrier element 26 of the first planet gear set 20 to the third planet carrier element 46 of the third planet gear set 40 when the fifth torque transmission device 85 is in the engaged position. The third torque transmission device 83 is a rotational torque transmission device, commonly referred to as a clutch.

[0029] The fourth torque transmission device 84, such as a clutch, selectively connects the third ring gear element 44 of the third planet gear set 40 with the second planet carrier element 36 of the second planet gear set 30. The fourth torque transmission device 84 is a rotational torque transmission device, commonly referred to as a clutch.

[0030] The fifth torque transmission device 85, such as a clutch, selectively connects the first planet carrier element 26 of the first planet gear set 20 to the J-node 91. The fifth torque transmission device 85 is a torque transmission-type torque transmission device, commonly referred to as a clutch.

[0031] The sixth torque transmission device 86, which is a clutch, selectively connects an engine crankshaft 11 of the internal combustion engine 12 to the second planetary carrier element 36 of the second planetary gear set 30 to operate the vehicle in a hybrid mode, an engine mode, or an electric motor start device (EMLD) mode. In engine mode (ICE), the powertrain 10 uses only the internal combustion engine 12 to provide drive torque to the multi-speed transmission 14. The sixth torque transmission device 86 is a rotary torque transmission device, commonly referred to as a clutch.

[0032] In electric mode (EV), the powertrain 10 uses only the electric motor-generator 90 to provide drive torque to the multi-speed transmission 14. In hybrid mode, the powertrain 10 uses both the internal combustion engine 12 and the electric motor-generator 90 to provide drive torque to the multi-speed transmission 14, and the speeds of the internal combustion engine 12 and the electric motor-generator 90 are the same. In EMLD mode, the powertrain 10 uses both the internal combustion engine 12 and the electric motor-generator 90 to provide input torque to the multi-speed transmission 14, and the speeds of the internal combustion engine 12 and the electric motor-generator 90 are different. Fig. 2 shows the speed ratios with the motor speed equal to 0 revolutions per minute ( / min).

[0033] The seventh torque transmission device 87, such as a clutch, selectively connects the electric motor-generator 90 and the fifth sun gear element 62 of the fifth planetary gear set 60 to the engine crankshaft 11 of the internal combustion engine 12 to operate in hybrid mode. The seventh torque transmission device 87 is a rotational torque transmission device, commonly referred to as a clutch. Since the drivetrain 10 includes the sixth torque transmission device 86 and the seventh torque transmission device 87, it does not require (and therefore does not include) a torque converter.

[0034] An electrical energy source 94 is electrically connected to the electric motor-generator 90. Thus, the electric motor-generator 90 can transfer energy to or receive energy from the electrical energy source 94. The electrical energy source 94 can be one or more batteries. Other electrical energy sources 94, such as fuel cells, are capable of providing or storing and delivering electrical energy and can be used instead of batteries.

[0035] A controller 96 is connected to the electrical power source to control the distribution of power to or from the power source. The controller 96 can include hardware elements such as a processor (P), a circuit containing a timer, an oscillator, an analog-to-digital (A / D) converter, a digital-to-analog (D / A) converter, a digital signal processor, and input / output (I / O) devices, as well as other signal conditioning and / or buffering circuits. The memory (M) can include both concrete permanent storage locations such as read-only memory (ROM), e.g., magnetic, solid-state, and / or optical memory, and a sufficient amount of random-access memory (RAM), electrically-erasable programmable read-only memory (EEPROM), etc.

[0036] Returning to the description of the energy sources, this should be evident from the preceding description and with particular reference to Fig. 1, that the multi-speed transmission 14 selectively receives energy from the motor 12. The multi-speed transmission 14 also receives energy from an electrical energy source 94 connected to the control unit 96. The electrical energy source 94 can be one or more batteries. Other electrical energy sources 94, such as capacitors or fuel cells, which have the ability to supply or deliver electrical energy, can be used instead of or in combination with batteries. The speed ratio between the motor crankshaft 11 and the output element 19 is determined by the state of the torque transmission devices (i.e.,a first torque transmission device 81, a second torque transmission device 82, a third torque transmission device 83, a fourth torque transmission device 84, a fifth torque transmission device 85, a sixth torque transmission device 86 and a seventh torque transmission device 87) and the gear / sun gear ratios of the planetary gear sets (i.e., a first planetary gear set 20, a second planetary gear set 30, a third planetary gear set 40, a fourth planetary gear set 50 and fifth planetary gear sets 60).

[0037] As in Fig. As shown in Figure 2, and in particular according to the truth table disclosed therein, the torque transmission devices (i.e., a first torque transmission device 81, a second torque transmission device 82, a third torque transmission device 83, a fourth torque transmission device 84, a fifth torque transmission device 85, a sixth torque transmission device 86, and a seventh torque transmission device 87) engage selectively in combinations of at least four to provide at least twenty forward gear ratios and at least one reverse gear ratio (e.g., two), all with sequential single-shift displacements. Fig. In the table, the X in 2 indicates that the torque transmission device is in the engaged or ON position, thereby transmitting torque. Otherwise, if in Fig. If no X is shown, the torque transmission device is in the disengaged or OFF position and is not transmitting any torque. The unique arrangement of the multi-speed transmission 14 improves the overall size by minimizing the length of the multi-speed transmission 14.

[0038] With reference to Fig. 3. The planetary gear assembly 18 may further include an eighth torque transmission device 88, such as a brake, which selectively connects the fifth sun gear element 62 of the fifth planetary gear set 60 to the stationary component SC (e.g., the gearbox housing 61) to selectively anchor the electric motor-generator 90, thereby providing the multi-speed transmission 14 with ten speed ratios. The eighth torque transmission device 88 is a stationary torque transmission device, commonly referred to as a brake or reaction clutch.

[0039] Alternatively, as in Fig. As shown in Figure 4, the eighth torque transmission device 88 selectively connects the fifth ring gear element 64 of the fifth planetary gear set 60 to the stationary component (e.g., gearbox housing 61) to selectively anchor the electric motor-generator 90, thereby providing the multi-speed transmission 14 with ten speed ratios.

[0040] With reference to Fig. 5. The third torque transmission device 83 can be replaced by a fixed connection. As such, in this embodiment, the planetary gear assembly 18 includes a sixth connecting element 79 (e.g., a sixth connecting shaft) that continuously connects the third planet carrier element 46 of the third planetary gear set 40 to J-nodes 91. As a result, the speed ratios E are eliminated, as shown in Fig. 2 shown.

Claims

[1] Hybrid powertrain (10), comprising: an internal combustion engine (12); a multi-speed transmission (14) comprising the following: a drive element (17); a drive element (19); a first planetary gear set (20), a second planetary gear set (30), a third planetary gear set (40), a fourth planetary gear set (50) and a fifth planetary gear set (60) each with a sun gear element (22, 32, 42, 52, 62), a planet carrier element (26, 36, 46, 56, 66) and a ring gear element (24, 34, 44, 54, 64); a first connecting element (70) that continuously connects the sun gear element (22) of the first planet gear set (20) to the sun gear element (32) of the second planet gear set (30); a second connecting element (72) that continuously connects the planet carrier element (26) of the first planet gear set (20) to the ring gear element (54) of the fourth planet gear set (50); a third connecting element (74) that continuously connects the ring gear element (34) of the second planet gear set (30) to the sun gear element (42) of the third planet gear set (40); a fourth connecting element (76) that continuously connects the planet carrier element (66) of the fifth planet gear set (60) to the sun gear element (22) of the first planet gear set (20); seven torque transmission devices (81, 82, 83, 84, 85, 86, 87) configured to connect the first planetary gear set (20), the second planetary gear set (30), the third planetary gear set (40), the fourth planetary gear set (50) and the fifth planetary gear set (60) together in combinations of at least four to produce at least ten forward gear ratios and at least one reverse gear ratio between the drive element (17) and the driven element (19); and an electric motor-generator (90) connected to the multi-speed transmission (14). [2] Hybrid powertrain (10) according to claim 1, further comprising a fifth connecting element (78) which continuously connects the electric motor generator (90) to the sun gear element (62) of the fifth planetary gear set (60). [3] Hybrid powertrain (10) according to claim 2, further comprising a gearbox housing (61), wherein a first of the seven torque transmission devices (81) selectively connects the ring gear element (24) of the first planetary gear set (20) to the gearbox housing (61). [4] Hybrid powertrain (10) according to claim 3, wherein a second of the seven torque transmission devices (82) selectively connects the ring gear element (34) of the second planetary gear set (30) to a J-node (91). [5] Hybrid powertrain (10) according to claim 4, wherein a third of the seven torque transmission devices (83) selectively connects the planet carrier element (46) of the third planet gear set (40) to the J-node (91). [6] Hybrid powertrain (10) according to claim 5, wherein a fourth of the seven torque transmission devices (84) selectively connects the ring gear element (44) of the third planet gear set (40) to the planet carrier element (36) of the second planet gear set (30). [7] Hybrid powertrain (10) according to claim 6, wherein a fifth of the seven torque transmission devices (85) selectively connects the planet carrier element (26) of the first planet gear set (20) to the J-node (91). [8] Hybrid powertrain (10) according to claim 7, wherein a sixth of the torque transmission devices (86) selectively connects an engine crankshaft (11) of the internal combustion engine (12) to the planet carrier element (36) of the second planet gear set (30). [9] Hybrid powertrain (10) according to claim 8, wherein a seventh of the torque transmission devices (87) selectively connects the electric motor generator (90) and the sun gear element (62) of the fifth planetary gear set (60) to the engine crankshaft (11) of the internal combustion engine (12), and an eighth of the torque transmission devices (88) selectively connects the ring gear element (64) of the fifth planetary gear set (60) to a stationary component (SC, 61) to selectively anchor the electric motor generator (90). [10] Hybrid powertrain (10) according to claim 1, further comprising: an axle drive mechanism (16) which is continuously connected to the planet carrier element (56) of the fourth planet gear set (50); wherein the axle drive mechanism (16) is coupled to the output element (19).

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