Transmission for a vehicle drivetrain and methods for controlling such a transmission

Abstract

Transmission (1) for a drive train of a vehicle, comprising • a first transmission input shaft (W1) arranged on a first axis of rotation (AX1) for connecting a first electric machine (EM1), • a second transmission input shaft (W2) arranged on the first axis of rotation (AX1) for connecting a second electric machine (EM2), • at least one planetary gear set (P1) arranged on the first axis of rotation (AX1) and effectively connected to the two drive shafts (W1, W2) and designed as a superimposed gear set with a first element (P11), a second element (P12) and a third element (P13), • a second axis of rotation (AX2) arranged parallel to the first axis of rotation (AX1) on which a countershaft (W3), a first gear (21), a second gear (22), a third gear (23) and a fourth gear (24) are arranged, • wherein the first gear (21) on the second axis of rotation (AX2) engages with a first gear (11) on the first axis of rotation (AX1) and forms a first spur gear stage (ST1), • wherein the second gear (22) on the second axis of rotation (AX2) engages with a second gear (12) on the first axis of rotation (AX1) and forms a second spur gear stage (ST2), • wherein the third gear (23) on the second axis of rotation (AX2) engages with a third gear (13) on the first axis of rotation (AX1) and forms a third spur gear stage (ST3), • wherein the fourth gear (24) on the second axis of rotation (AX2) engages with a fourth gear (14) on the first axis of rotation (AX1) and forms a fourth spur gear stage (ST4), • an output shaft (W4) arranged on the first axis of rotation (AX1), • a first switching element (A1) which, in the closed state, connects the second and third gear (22, 23) on the second axis of rotation (AX2) in a rotationally fixed manner, • a second switching element (B1) which, in the closed state, connects the third gear (23) on the second axis of rotation (AX2) to the countershaft (W3) in a rotationally fixed manner, • a third switching element (H1) which, in the closed state, connects the output shaft (W4) to the second element (P12) of the planetary gear set (P1) in a rotationally fixed manner, • a fourth switching element (D1) which, in the closed state, connects the third gear (13) on the first axis of rotation (AX1) to the output shaft (W4) in a rotationally fixed manner, • a fifth switching element (E1) which, in the closed state, connects the fourth gear (14) on the first axis of rotation (AX1) to the output shaft (W4) in a rotationally fixed manner, • wherein the first gear (11) is non-rotatably connected to the third element (P13) of the planetary gear set (P1) on the first axis of rotation (AX1), • wherein the second gear (12) is non-rotatably connected to the second element (P12) of the planetary gear set (P1) on the first axis of rotation (AX1), • wherein the first gear (21) is non-rotatably connected to the countershaft (W3) on the second axis of rotation (AX2), • wherein the fourth gear (24) is non-rotatably connected to the countershaft (W3) on the second axis of rotation (AX2), • wherein the first element (P11) of the planetary gear set (P1) is non-rotatably connected to the first transmission input shaft (W1), • wherein the third element (P13) of the planetary gear set (P1) is non-rotatably connected to the second transmission input shaft (W2).

Description

[0001] The invention relates to a transmission for a drive train of a vehicle. Furthermore, the invention relates to a method for controlling such a transmission.

[0002] For example, DE 10 2021 203 726 A1 discloses a transmission arrangement for a motor vehicle, comprising a first shaft for supplying internal combustion engine drive power, a second shaft connected to a first electric machine, a third shaft for outputting output power, a fourth shaft offset axially parallel to the third shaft, a fifth shaft connectable to the first shaft via a first clutch, and a first planetary gear set. The first planetary gear set has a first member, a second member, and a third member. The second shaft is connectable to the first shaft via a second clutch. The second shaft is connected to the first member. The fifth shaft is connected to the second member. The third shaft is connected to the third member.

[0003] From DE 10 2021 202 472 A1, an electric transmission for a motor vehicle drive train with a first electric drive motor and a second electric drive motor is known, comprising: a first transmission input shaft with a first transmission connection for drivingly connecting the electric transmission to the first electric drive motor; a second transmission input shaft with a second transmission connection for drivingly connecting the electric transmission to the second electric drive motor; a countershaft; gear pairs arranged in several gear set planes and consisting of loose gears and fixed gears for forming gear steps; several shifting elements for engaging the gear steps; a planetary gear set comprising a sun gear, a planet gear carrier and a ring gear;and a third transmission input shaft, which is drivingly connected to the planetary gear carrier of the planetary gear set, wherein the first electric drive motor is drivingly connected to the ring gear of the planetary gear set; and the second electric drive motor is drivingly connected to the sun gear of the planetary gear set. The present invention further relates to a motor vehicle drive train with such an electric transmission, a motor vehicle with such a motor vehicle drive train, and a method for starting using such a motor vehicle drive train.

[0004] The object of the present invention is to provide an alternative transmission with two drive motors and a method for controlling such a transmission. In particular, the transmission should be compact and efficient, have multiple gears, and enable power shifting with good efficiency. This object is achieved by a respective transmission and an associated method having the features of the independent claims.

[0005] All twelve embodiments of the transmission according to the invention implement a cascade connection. Starting with a multi-shaft transmission, which is differentiated by the gear pairs into input and output sides, the gears are shifted on the output shaft. In other words, the conceptual separation between input and output sides takes place in the gears of the gear pairs, since one gear of the respective gear pair is designed as the driving gear, and the other gear of the respective gear pair is designed as the output gear. (continued on page 2 of the originally submitted documents)

[0006] From the drive-side continuous shaft, which can only drive one engaged gear, two sub-transmissions can be created by decoupling a drive-side gear wheel, whose various drives then drive the respective engaged gears. Powershifting occurs with mutual support of the sub-transmissions, where one drive is shifted further and the second drive is pulled along. The latter is achieved by continuously coupling the gear wheel pairs on the drive side. This ensures powershift capability with good efficiency despite the exclusive use of positive shifting elements for gear shifting. The differential, i.e. the planetary gear set P1, which is intended for the EDL shift modes, runs in the gears as a block and is thus interlocked.

[0007] Exemplary embodiments or aspects of transmissions and methods according to the invention will now be described, which are not part of the claims.

[0008] 11th aspect: Transmission (1) for a drive train of a vehicle, comprising • a first transmission input shaft (W1) arranged on a first rotational axis (AX1) for connecting a first electric machine (EM1), • a second transmission input shaft (W2) arranged on the first rotation axis (AX1) for connecting a second electric machine (EM2), • at least one planetary gear set (P1) arranged on the first rotational axis (AX1) and connected to the two drive shafts (W1, W2) in a driving manner and designed as a superposition gear, with a first element (P11), a second element (P12) and a third element (P13), • a second rotational axis (AX2) arranged axially parallel to the first rotational axis (AX1), on which a countershaft (W3), a first gear (21), a second gear (22) and a third gear (23) are arranged, • wherein the first gear (21) on the second rotational axis (AX2) meshes with a first gear (11) on the first rotational axis (AX1) and forms a first spur gear stage (ST1), • wherein the second gear (22) on the second rotational axis (AX2) meshes with a second gear (12) on the first rotational axis (AX1) and forms a second spur gear stage (ST2), • wherein the third gear (23) on the second rotational axis (AX2) meshes with a third gear (13) on the first rotational axis (AX1) and forms a third spur gear stage (ST3), • a first switching element (A6) which, in the closed state, connects the second gear (12) on the first rotational axis (AX1) to the third element (P13) of the planetary gear set (P1) in a rotationally fixed manner, • a second switching element (B6) which, in the closed state, connects the first and second gear wheels (11, 12) on the first rotation axis (AX1) in a rotationally fixed manner, • a third switching element (D6) which, in the closed state, connects the first gear (21) on the second rotation axis (AX2) to the countershaft (W3) in a rotationally fixed manner, • a fourth switching element (E6) which, in the closed state, connects the second gear (22) on the second rotation axis (AX2) to the countershaft (W3) in a rotationally fixed manner, • a fifth switching element (F6) which, in the closed state, connects the third gear (23) on the second rotation axis (AX2) to the countershaft (W3) in a rotationally fixed manner, • wherein the first gear (11) is connected in a rotationally fixed manner to the second element (P12) of the planetary gear set (P1) on the first rotation axis (AX1), • wherein the third gear (13) on the first rotation axis (AX1) is connected in a rotationally fixed manner to the third element (P13) of the planetary gear set (P1), • wherein the first element (P11) of the planetary gear set (P1) is connected in a rotationally fixed manner to the first transmission input shaft (W1), • wherein the third element (P13) of the planetary gear set (P1) is connected in a rotationally fixed manner to the second transmission input shaft (W2).

[0009] 12th aspect: Method for setting gears and EDS shift modes for a transmission (1) according to aspect 11, • wherein in a first gear the first switching element (A6), the second switching element (B6) and the fifth switching element (F6) are closed and the third switching element (D6) and the fourth switching element (E6) are open, • to initiate an EDS2 shift mode from the first gear, the first shift element (A6) is first opened, then the fourth shift element (E6) is closed and then the fifth shift element (F6) is opened, to initiate a second gear from this EDS2 shift mode, the first shift element (A6) is closed, • in second gear, the first switching element (A6), the second switching element (B6) and the fourth switching element (E6) are closed and the third switching element (D6) and the fifth switching element (F6) are open, • to initiate an EDS3 shift mode from the second gear, the second shift element (B6) is first opened, then the third shift element (D6) is closed and then the fourth shift element (E6) is opened, to initiate a third gear from this EDS3 shift mode, the second shift element (B6) is closed, • wherein in third gear the first switching element (A6), the second switching element (B6) and the third switching element (D6) are closed and the fourth switching element (E6) and the fifth switching element (F6) are open.

[0010] 13th aspect: Transmission (1) for a drive train of a vehicle, comprising • a first transmission input shaft (W1) arranged on a first rotational axis (AX1) for connecting a first electric machine (EM1), • a second transmission input shaft (W2) arranged on the first rotation axis (AX1) for connecting an internal combustion engine (VM), • at least one planetary gear set (P1) arranged on the first rotational axis (AX1) and connected to the two drive shafts (W1, W2) in a driving manner and designed as a superposition gear, with a first element (P11), a second element (P12) and a third element (P13), • a second rotational axis (AX2) arranged axially parallel to the first rotational axis (AX1), on which a countershaft (W3), a first gear (21), a second gear (22) and a third gear (23) are arranged, • wherein the first gear (21) on the second rotational axis (AX2) meshes with a first gear (11) on the first rotational axis (AX1) and forms a first spur gear stage (ST1), • wherein the second gear (22) on the second rotational axis (AX2) meshes with a second gear (12) on the first rotational axis (AX1) and forms a second spur gear stage (ST2), • wherein the third gear (23) on the second rotational axis (AX2) meshes with a third gear (13) on the first rotational axis (AX1) and forms a third spur gear stage (ST3), • a first switching element (A7) which, in the closed state, connects the first and second gears (11, 12) on the first rotation axis (AX1) in a rotationally fixed manner, • a second switching element (B7) which, in the closed state, connects the second and third gear wheels (12, 13) on the first rotation axis (AX1) in a rotationally fixed manner, • a third switching element (C7) which, in the closed state, connects the third gear (13) on the first rotation axis (AX1) to the third element (P13) of the planetary gear set (P1) in a rotationally fixed manner, • a fourth switching element (D7) which, in the closed state, connects the third gear (23) on the second rotation axis (AX2) to the countershaft (W3) in a rotationally fixed manner, • a fifth switching element (E7) which, in the closed state, connects the second gear (22) on the second rotation axis (AX2) to the countershaft (W3) in a rotationally fixed manner, • a sixth switching element (F7) which, in the closed state, connects the first gear (21) on the second rotation axis (AX2) to the countershaft (W3) in a rotationally fixed manner, • wherein the first gear (11) is connected in a rotationally fixed manner to the second element (P12) of the planetary gear set (P1) on the first rotation axis (AX1), • wherein the first element (P11) of the planetary gear set (P1) is connected in a rotationally fixed manner to the first transmission input shaft (W1), • wherein the third element (P13) of the planetary gear set (P1) is connected in a rotationally fixed manner to the second transmission input shaft (W2).

[0011] 14th aspect: Method for setting gears, EDS shift modes and an EDA driving mode for a transmission (1) according to aspect 13, • wherein in an EDA driving mode, the first switching element (A7), the second switching element (B7) and the fourth switching element (D7) are closed and the third switching element (C7), the fifth switching element (E7) and the sixth switching element (F7) are open, wherein the third switching element (C7) is closed to initiate a first gear, • in first gear, the first switching element (A7), the second switching element (B7), the third switching element (C7) and the fourth switching element (D7) are closed and the fifth switching element (E7) and the sixth switching element (F7) are open, • to initiate an EDS2 shift mode from the first gear, the second shift element (B7) is first opened, then the fifth shift element (E7) is closed and then the fourth shift element (D7) is opened, to initiate a second gear from this EDS2 shift mode, the second shift element (B7) is closed, • in second gear, the first switching element (A7), the second switching element (B7), the third switching element (C7) and the fifth switching element (E7) are closed and the fourth switching element (D7) and the sixth switching element (F7) are open, • to initiate an EDS3 shift mode from the second gear, the first shift element (A7) is first opened, then the sixth shift element (F7) is closed and then the fifth shift element (E7) is opened, to initiate a third gear from this EDS3 shift mode, the first shift element (A7) is closed, • wherein in third gear the first switching element (A7), the second switching element (B7), the third switching element (C7) and the sixth switching element (F7) are closed and the fourth switching element (D7) and the fifth switching element (E7) are open.

[0012] 15th aspect: Transmission (1) for a drive train of a vehicle, comprising • a first transmission input shaft (W1) arranged on a first rotational axis (AX1) for connecting a first electric machine (EM1), • a second transmission input shaft (W2) arranged on the first rotation axis (AX1) for connecting a second electric machine (EM2), • a first planetary gear set (P1) arranged on the first rotational axis (AX1) and connected to the two drive shafts (W1, W2) in a driving manner and designed as a superposition gear, with a first element (P11), a second element (P12) and a third element (P13), • a second planetary gear set (P2) arranged on the first rotational axis (AX1) with a first element (P21), a second element (P22) and a third element (P23), • a second rotational axis (AX2) arranged axially parallel to the first rotational axis (AX1) on which a countershaft (W3), a first gear (21), a second gear (22), a third gear (23) and a fourth gear (24) are arranged, • wherein the first gear (21) on the second rotational axis (AX2) meshes with a first gear (11) on the first rotational axis (AX1) and forms a first spur gear stage (ST1), • wherein the second gear (22) on the second rotational axis (AX2) meshes with a second gear (12) on the first rotational axis (AX1) and forms a second spur gear stage (ST2), • wherein the third gear (23) on the second rotational axis (AX2) meshes with a third gear (13) on the first rotational axis (AX1) and forms a third spur gear stage (ST3), • wherein the fourth gear (24) on the second rotational axis (AX2) meshes with a fourth gear (14) on the first rotational axis (AX1) and forms a fourth spur gear stage (ST4), • an output shaft (W4) arranged on the first rotational axis (AX1) and operatively connected to the second planetary gear set, • a first switching element (A8) which, in the closed state, connects the first and second gear wheels (11, 12) on the first rotation axis (AX1) in a rotationally fixed manner, • a second switching element (B8) which, in the closed state, connects the second and third gear wheels (12, 13) on the first rotation axis (AX1) in a rotationally fixed manner, • a third switching element (C8) which, in the closed state, connects the third gear (13) on the first rotational axis (AX1) to the third element (P13) of the first planetary gear set (P1) in a rotationally fixed manner, • a fourth switching element (D8) which, in the closed state, connects the third gear (23) on the second rotation axis (AX2) to the countershaft (W3) in a rotationally fixed manner, • a fifth switching element (E8) which, in the closed state, connects the second gear (22) on the second rotation axis (AX2) to the countershaft (W3) in a rotationally fixed manner, • a sixth switching element (F8) which, in the closed state, connects the first gear (21) on the second rotation axis (AX2) to the countershaft (W3) in a rotationally fixed manner, • a seventh switching element (H8) which, in the closed state, connects the third element (P13) of the first planetary gear set (P1) to the first element (P21) of the second planetary gear set (P2) in a rotationally fixed manner, • an eighth switching element (K8) which, in the closed state, connects the fourth gear (14) on the first rotational axis (AX1) to the first element (P21) of the second planetary gear set (P2) in a rotationally fixed manner, • a ninth switching element (P8) which, in the closed state, connects the fourth gear (14) on the first rotational axis (AX1) to the second element (P22) of the second planetary gear set (P2) in a rotationally fixed manner, • a tenth switching element (G8) which, when closed, connects the third element of the second planetary gear set (P2) to a stationary component in a rotationally fixed manner, • wherein the first gear (11) is connected on the first rotation axis (AX1) to the second element (P12) of the first planetary gear set (P1) in a rotationally fixed manner, • wherein the fourth gear (24) on the second rotation axis (AX2) is connected in a rotationally fixed manner to the countershaft (W3), • wherein the second element (P22) of the second planetary gear set (P2) is connected in a rotationally fixed manner to the output shaft (W4), • wherein the first element (P11) of the first planetary gear set (P1) is connected in a rotationally fixed manner to the first transmission input shaft (W1), • wherein the third element (P13) of the first planetary gear set (P1) is connected in a rotationally fixed manner to the second transmission input shaft (W2).

[0013] 16th aspect: Method for setting gears, EDS shift modes and an EDA driving mode for a transmission (1) according to aspect 15, • wherein in an EDA driving mode, the first switching element (A8), the second switching element (B8), the fourth switching element (D8), the eighth switching element (K8) and the tenth switching element (G8) are closed and the third switching element (C8), the fifth switching element (E8), the sixth switching element (F8), the seventh switching element (H8) and the ninth switching element (P8) are open, wherein to initiate a first gear from the EDA driving mode, the third switching element (C8) is closed, • wherein in first gear the first switching element (A8), the second switching element (B8), the third switching element (C8), the fourth switching element (D8), the eighth switching element (K8) and the tenth switching element (G8) are closed and the fifth switching element (E8), the sixth switching element (F8), the seventh switching element (H8) and the ninth switching element (P8) are open, • to initiate an EDS2 shift mode from the first gear, the second shift element (B8) is first opened, then the fifth shift element (E8) is closed and then the fourth shift element (D8) is opened, to initiate a second gear from this EDS2 shift mode, the second shift element (B8) is closed, • wherein in second gear the first switching element (A8), the second switching element (B8), the third switching element (C8), the fifth switching element (E8), the eighth switching element (K8) and the tenth switching element (G8) are closed and the fourth switching element (D8), the sixth switching element (F8), the seventh switching element (H8) and the ninth switching element (P8) are open, • to initiate an EDS3 shift mode from the second gear, the first shift element (A8) is first opened, then the sixth shift element (F8) is closed and then the fifth shift element (E8) is opened, to initiate a third gear from this EDS3 shift mode, the seventh shift element (H8) is closed, • wherein in third gear, the second switching element (B8), the third switching element (C8), the sixth switching element (F8), the seventh switching element (H8), the eighth switching element (K8) and the tenth switching element (G8) are closed and the first switching element (A8), the fourth switching element (D8), the fifth switching element (E8) and the ninth switching element (P8) are open, • To initiate an EDS4 shift mode from third gear, first the eighth shift element (K8) is opened, then the ninth shift element (P8) is closed, then the sixth shift element (F8) is opened, then the first shift element (A8) is closed, then the third shift element (C8) is opened, then the fourth shift element (D8) is closed and then the tenth shift element (G8) is opened, to initiate a fourth gear from this EDS4 shift mode, the eighth shift element (K8) is closed, then the seventh shift element (H8) is opened and then the third shift element (C8) is closed, • in fourth gear, the first switching element (A8), the second switching element (B8), the third switching element (C8), the fourth switching element (D8), the eighth switching element (K8) and the ninth switching element (P8) are closed and the fifth switching element (E8), the sixth switching element (F8), the seventh switching element (H8) and the tenth switching element (G8) are open, • to initiate an EDS5 shift mode from the fourth gear, the second shift element (B8) is first opened, then the fifth shift element (E8) is closed and then the fourth shift element (D8) is opened, to initiate a fifth gear from this EDS5 shift mode, the second shift element (B8) is closed, • in fifth gear, the first switching element (A8), the second switching element (B8), the third switching element (C8), the fifth switching element (E8), the eighth switching element (K8) and the ninth switching element (P8) are closed and the fourth switching element (D8), the sixth switching element (F8), the seventh switching element (H8) and the tenth switching element (G8) are open, • to initiate an EDS6 shift mode from the fifth gear, the first shift element (A8) is first opened, then the sixth shift element (F8) is closed and then the fifth shift element (E8) is opened, to initiate a sixth gear from this EDS6 shift mode, the seventh shift element (H8) is closed, then the sixth shift element (F8) is opened and then the first shift element (A8) is closed, • wherein in sixth gear the first switching element (A8), the second switching element (B8), the third switching element (C8), the seventh switching element (H8), the eighth switching element (K8) and the ninth switching element (P8) are closed and the fourth switching element (D8), the fifth switching element (E8), the sixth switching element (F8) and the tenth switching element (G8) are open.

[0014] 17th aspect: Transmission (1) for a drive train of a vehicle, comprising • a first transmission input shaft (W1) arranged on a first rotational axis (AX1) for connecting a first electric machine (EM1), • a second transmission input shaft (W2) arranged on the first rotation axis (AX1) for connecting a second electric machine (EM2), • a first planetary gear set (P1) arranged on the first rotational axis (AX1) and connected to the two drive shafts (W1, W2) in a driving manner and designed as a superposition gear, with a first element (P11), a second element (P12) and a third element (P13), • a second planetary gear set (P2) arranged on the first rotational axis (AX1) with a first element (P21), a second element (P22) and a third element (P23), • a second rotational axis (AX2) arranged axially parallel to the first rotational axis (AX1), on which a countershaft (W3), a first gear (21), a second gear (22), a third gear (23), a fourth gear (24) and a fifth gear (25) are arranged, • wherein the first gear (21) on the second rotational axis (AX2) meshes with a first gear (11) on the first rotational axis (AX1) and forms a first spur gear stage (ST1), • wherein the second gear (22) on the second rotational axis (AX2) meshes with a second gear (12) on the first rotational axis (AX1) and forms a second spur gear stage (ST2), • wherein the third gear (23) on the second rotational axis (AX2) meshes with a third gear (13) on the first rotational axis (AX1) and forms a third spur gear stage (ST3), • wherein the fourth gear (24) on the second rotational axis (AX2) meshes with a fourth gear (14) on the first rotational axis (AX1) and forms a fourth spur gear stage (ST4), • wherein the fifth gear (25) on the second rotational axis (AX2) meshes with a fifth gear (15) on the first rotational axis (AX1) and forms a fifth spur gear stage (ST5), • an output shaft (W4) arranged on the first rotational axis (AX1) and operatively connected to the second planetary gear set (P2), • a first switching element (A9) which, in the closed state, connects the fourth gear (24) on the second rotation axis (AX2) to the countershaft (W3) in a rotationally fixed manner, • a second switching element (B9) which, in the closed state, connects the third and fourth gear wheels (23, 24) on the second rotation axis (AX2) in a rotationally fixed manner, • a third switching element (C9) which, in the closed state, connects the second and third gear wheels (22, 23) on the second rotation axis (AX2) in a rotationally fixed manner, • a fourth switching element (H9) which, in the closed state, connects the second element (P12) of the first planetary gear set (P1) to the first element (P21) of the second planetary gear set (P2) in a rotationally fixed manner, • a fifth switching element (D9) which, in the closed state, connects the third gear (13) on the first rotational axis (AX1) to the first element (P21) of the second planetary gear set (P2) in a rotationally fixed manner, • a sixth switching element (E9) which, in the closed state, connects the fourth gear (14) on the first rotational axis (AX1) to the first element (P21) of the second planetary gear set (P2) in a rotationally fixed manner, • a seventh switching element (F9) which, in the closed state, connects the fifth gear (15) on the first rotational axis (AX1) to the first element (P21) of the second planetary gear set (P2) in a rotationally fixed manner, • an eighth switching element (P9) which, in the closed state, connects the fifth gear (15) on the first rotational axis (AX1) to the second element (P22) of the second planetary gear set (P2) in a rotationally fixed manner, • a ninth switching element (L9) which, in the closed state, connects the first element (P21) of the second planetary gear set (P2) to the second element (P22) of the second planetary gear set (P2) in a rotationally fixed manner, • a tenth switching element (G9) which, when closed, connects the third element of the second planetary gear set (P2) to a stationary component in a rotationally fixed manner, • wherein the first gear (11) on the first rotation axis (AX1) is connected in a rotationally fixed manner to the third element (P13) of the first planetary gear set (P1), • wherein the second gear (12) is connected on the first rotational axis (AX1) to the second element (P12) of the first planetary gear set (P1) in a rotationally fixed manner, • wherein the second gear (22) is connected in a rotationally fixed manner to the countershaft (W3) on the second rotation axis (AX2), • wherein the fifth gear (25) on the second rotation axis (AX2) is connected in a rotationally fixed manner to the countershaft (W3), • wherein the second element (P22) of the second planetary gear set (P2) is connected in a rotationally fixed manner to the output shaft (W4), • wherein the first element (P11) of the first planetary gear set (P1) is connected in a rotationally fixed manner to the first transmission input shaft (W1), • wherein the third element (P13) of the first planetary gear set (P1) is connected in a rotationally fixed manner to the second transmission input shaft (W2).

[0015] 18th aspect: Method for setting gears and EDS shift modes for a transmission (1) according to aspect 17, • wherein in a first gear, the first switching element (A9), the second switching element (B9), the third switching element (C9), the seventh switching element (F9) and the tenth switching element (G9) are closed and the fourth switching element (H9), the fifth switching element (D9), the sixth switching element (E9), the eighth switching element (P9) and the ninth switching element (L9) are open, • to initiate an EDS2 shift mode from the first gear, the first shift element (A9) is first opened, then the sixth shift element (E9) is closed and then the seventh shift element (F9) is opened, to initiate a second gear from this EDS2 shift mode, the first shift element (A9) is closed, • wherein in second gear the first switching element (A9), the second switching element (B9), the third switching element (C9), the sixth switching element (E9) and the tenth switching element (G9) are closed and the fourth switching element (H9), the fifth switching element (D9), the seventh switching element (F9), the eighth switching element (P9) and the ninth switching element (L9) are open, • to initiate an EDS3 shift mode from the second gear, the second shift element (B9) is first opened, then the fifth shift element (D9) is closed and then the sixth shift element (E9) is opened, to initiate a third gear from this EDS3 shift mode, the second shift element (B9) is closed, • wherein in third gear, the first switching element (A9), the second switching element (B9), the third switching element (C9), the fifth switching element (D9) and the tenth switching element (G9) are closed and the fourth switching element (H9), the sixth switching element (E9), the seventh switching element (F9), the eighth switching element (P9) and the ninth switching element (L9) are open, • to initiate an EDS4 shift mode from the third gear, the third shift element (C9) is first opened, then the fourth shift element (H9) is closed and then the fifth shift element (D9) is opened, to initiate a fourth gear from this EDS4 shift mode, the eighth shift element (P8) is closed, • in fourth gear, the first switching element (A9), the second switching element (B9), the fourth switching element (H9), the eighth switching element (P9) and the tenth switching element (G9) are closed and the third switching element (C9), the fifth switching element (D9), the sixth switching element (E9), the seventh switching element (F9) and the ninth switching element (L9) are open, • to initiate an EDS5 shift mode from fourth gear, first the tenth shift element (G9) is opened, then the ninth shift element (L9) is closed, then the fourth shift element (H9) is opened, then the third shift element (C9) is closed, then the first shift element (A9) is opened, then the sixth shift element (E9) is closed and then the eighth shift element (P9) is opened, to initiate a fifth gear from this EDS5 shift mode, the first shift element (A9) is closed, • in fifth gear, the first switching element (A9), the second switching element (B9), the third switching element (C9), the sixth switching element (E9) and the ninth switching element (L9) are closed and the fourth switching element (H9), the fifth switching element (D9), the seventh switching element (F9), the eighth switching element (P9) and the tenth switching element (G9) are open, • to initiate an EDS6 shift mode from the fifth gear, the second shift element (B9) is first opened, then the fifth shift element (D9) is closed and then the sixth shift element (E9) is opened, to initiate a sixth gear from this EDS6 shift mode, the second shift element (B9) is closed, • in sixth gear, the first switching element (A9), the second switching element (B9), the third switching element (C9), the fifth switching element (D9) and the ninth switching element (L9) are closed and the fourth switching element (H9), the sixth switching element (E9), the seventh switching element (F9), the eighth switching element (P9) and the tenth switching element (G9) are open, • to initiate an EDS7 shift mode from sixth gear, first the third shift element (C9) is opened, then the fourth shift element (H9) is closed and then the fifth shift element (D9) is opened, to initiate a seventh gear from this EDS7 shift mode, the third shift element (C9) is closed, • wherein in seventh gear the first shift element (A9), the second shift element (B9), the third shift element (C9), the fourth shift element (H9) and the ninth shift element (L9) are closed and the fifth shift element (D9), the sixth shift element (E9), the seventh shift element (F9), the eighth shift element (P9) and the tenth shift element (G9) are open.

[0016] The term “connection” of a shaft or a device to another shaft or to another device means that these shafts or devices are either directly connected to one another or can be indirectly connected to one another via at least one further component, in particular via further shafts and gears.

[0017] For example, a rotor shaft of the first electric machine, which, like the second electric machine, is designed as a drive motor, is drivingly connected to the first transmission input shaft directly or via at least one additional shaft, gears, and / or a traction mechanism. A transmission input shaft is understood to be a transmission element configured for connection to a respective drive motor. The respective drive motor can be arranged coaxially or axially parallel.

[0018] A "shaft" is not exclusively understood to mean, for example, a cylindrical, rotatably mounted transmission element for transmitting torque, but rather also general connecting elements that connect individual components or elements together, in particular connecting elements that connect several elements together in a rotationally fixed manner. Two shafts connected in a rotationally fixed manner can be formed as a single piece.

[0019] A “switching element” is a switchable device which, in a closed state, connects two shafts in a rotationally fixed manner and, in an open state, decouples the two shafts from each other, allowing them to rotate relative to each other.

[0020] Preferably, the transmission has only positive-locking shifting elements. A "positive-locking shifting element" is understood to mean a shifting element that has a toothing and / or claws for connecting two shafts, which positively engage with each other to establish a rotationally fixed connection. The transmission of power from one clutch part of the shifting element to the other clutch part of the shifting element occurs primarily through positive locking in a fully closed state. Positive-locking shifting elements increase the compactness and efficiency of the transmission.

[0021] Advantageous embodiments of the invention, which are explained below, are illustrated in the drawings, wherein like elements are provided with the same reference numerals. They show: Fig. 1a a schematic view of a drive train with a transmission according to the invention according to a first embodiment; Fig. 1b is a schematic view of a drive train with a transmission according to the invention according to a second embodiment; Fig. 1c a switching matrix for the respective drive train according to Fig. 1a and Fig. 1b; Fig. 2a a schematic view of a drive train with a transmission according to the invention according to a third embodiment; Fig. 2b a schematic view of a drive train with a transmission according to the invention according to a fourth embodiment; Fig. 2c a switching matrix for the respective drive train according to Fig. 2a and Fig. 2b; Fig. 3a a schematic view of a drive train with a transmission according to the invention according to a fifth embodiment; Fig. 3b a switching matrix for the drive train according to Fig. 3a; Fig. 4a a schematic view of a drive train with a transmission according to the invention according to a sixth embodiment; Fig. 4b a switching matrix for the drive train according to Fig. 4a; Fig. 5a a schematic view of a drive train with a transmission according to the invention according to a seventh embodiment; Fig. 5b a switching matrix for the drive train according to Fig. 5a; Fig. 6a is a schematic view of a drive train with a transmission according to the invention according to an eighth embodiment; Fig. 6b a schematic view of a drive train with a transmission according to the invention according to a ninth embodiment; Fig. 6c a switching matrix for the respective drive train according to Fig. 6a and Fig. 6b; Fig. 7a a schematic view of a drive train with a transmission according to the invention according to a tenth embodiment; Fig. 7b a switching matrix for the drive train according to Fig. 7a; Fig. 8a is a schematic view of a drive train with a transmission according to the invention according to an eleventh embodiment; Fig. 8b a switching matrix for the drive train according to Fig. 8a; Fig. 9a is a schematic view of a drive train with a transmission according to the invention according to a twelfth embodiment; and Fig. 9b a switching matrix for the drive train according to Fig. 9a;

[0022] Fig. 1a shows a drive train for a vehicle according to a first embodiment with a first electric machine EM1, a second electric machine EM2 and a transmission 1. Arranged on a first axis of rotation AX1 are a first transmission input shaft W1 for connecting the first electric machine EM1, a second transmission input shaft W2 for connecting the second electric machine EM2, an output shaft W4 and a planetary gear set P1, which is drivingly connected to the two input shafts W1, W2 and has a first element P11, a second element P12 and a third element P13. The planetary gear set P1 is designed as a superposition gear, in particular as a differential. Furthermore, the first element P11 is designed as a sun gear, the second element P12 is designed as a planet carrier, and the third element P13 is designed as a ring gear.Several planetary gears are rotatably mounted on the planet carrier and mesh with the sun gear and the ring gear.

[0023] A second rotation axis AX2 is arranged parallel to the first rotation axis AX1, on which a countershaft W3, a first gear 21, a second gear 22, a third gear 23 and a fourth gear 24 are arranged. The first gear 21 on the second rotation axis AX2 meshes with a first gear 11 on the first rotation axis AX1 and forms a first spur gear stage ST1. The second gear 22 on the second rotation axis AX2 meshes with a second gear 12 on the first rotation axis AX1 and forms a second spur gear stage ST2. The third gear 23 on the second rotation axis AX2 meshes with a third gear 13 on the first rotation axis AX1 and forms a third spur gear stage ST3, which is designed as a gear pair.The fourth gear 24 on the second rotational axis AX2 meshes with a fourth gear 14 on the first rotational axis AX1 and forms a fourth spur gear stage ST4, which is designed as a gear pair.

[0024] The transmission 1 further comprises a first shifting element A1, which, in the closed state, rotationally fixedly connects the second and third gears 22, 23 on the second rotational axis AX2, a second shifting element B1, which, in the closed state, rotationally fixedly connects the third gear 23 on the second rotational axis AX2 to the countershaft W3, a third shifting element H1, which, in the closed state, rotationally fixedly connects the output shaft W4 to the second element P12 of the planetary gear set P1, a fourth shifting element D1, which, in the closed state, rotationally fixedly connects the third gear 13 on the first rotational axis AX1 to the output shaft W4, and a fifth shifting element E1, which, in the closed state, rotationally fixedly connects the fourth gear 14 on the first rotational axis AX1 to the output shaft W4. All shifting elements are designed as positive-locking claw clutches.

[0025] The first gear 11 on the first axis of rotation AX1 is rotationally fixedly connected to the third element P13 of the planetary gear set P1, wherein the second gear 12 on the first axis of rotation AX1 is rotationally fixedly connected to the second element P12 of the planetary gear set P1, wherein the first gear 21 on the second axis of rotation AX2 is rotationally fixedly connected to the countershaft W3, wherein the fourth gear 24 on the second axis of rotation AX2 is rotationally fixedly connected to the countershaft W3, wherein the first element P11 of the planetary gear set P1 is rotationally fixedly connected to the first transmission input shaft W1, wherein the third element P13 of the planetary gear set P1 is rotationally fixedly connected to the second transmission input shaft W2.

[0026] For example, the first electric machine EM1 has an output of 50 kW, and the second electric machine EM2 has an output of 100 kW. The superposition gear enables a differential function and has, for example, a stationary gear ratio of i=-2. In this case, four actuators (not shown in detail) are used to shift three gears with the five shift elements A1, B1, H1, D1, and E1, with the shift elements H1 and E1 being shifted by a common actuator. The planetary gear set P1 is arranged axially on the second electric machine EM2.

[0027] Fig. 1b shows a drive train for a vehicle according to a second embodiment. The drive train according to Fig. 1b essentially corresponds to the drive train according to Fig. 1a, the difference between these two embodiments being that the planetary gear set P1 is arranged axially between the two electric machines EM1, EM2. Otherwise, the embodiment according to Fig. 1b of the embodiment according to Fig. 1a, to which reference is made.

[0028] A drive train according to Fig. 1a and Fig. 1b has several gears and shift modes, which are shown in the shift matrix according to Fig. 1c, wherein the respective switching elements A1, B1, H1, D1, E1 are listed in the columns of the switching matrix, and the respective gears and switching modes are listed in the rows of the switching matrix. Entering a cross in a respective box of the switching matrix represents a closed state of the respective switching element A1, B1, H1, D1, E1, while entering a circle indicates an open state of the respective switching element A1, B1, H1, D1, E1. The respective subscript number next to a state of the respective switching element A1, B1, H1, D1, E1 illustrates the order in which the respective switching element A1, B1, H1, D1, E1 is opened or closed. Using the five switching elements A1, B1, H1, D1, E1, three gears and two electrodynamic switching modes EDS2, EDS3 are implemented. Electrodynamic switching mode is abbreviated to EDS switching mode.

[0029] In the EDL shift modes, which are implemented with all embodiments of the transmission 1 according to the invention, the pre-selected shift of the differential output is performed in the load-free differential machine. After the shift has been completed and the load has been transferred to the differential output, the previously directly shifted gear of the base load machine is decoupled. The connecting speed for the next gear is established by compensating the two electric motors under load in the differential output. The base load machine is then shifted, and the two electric motors can drive independently of one another, i.e., feed drive power into the transmission. Since the base load machine provides support in the EDL shift modes, the load factor is higher the heavier the base load machine is.

[0030] All twelve embodiments of the transmission 1 according to the invention implement a cascade circuit. Starting with a continuous shaft on the drive side, which can only drive one engaged gear, two sub-transmissions can be created by appropriate decoupling of a drive-side gear wheel, whose various drives then drive the respective engaged gears. Powershifting occurs with mutual support of the sub-transmissions, where one drive is shifted further and the second drive is pulled along. The latter is achieved by continuously coupling the gear wheel pairs on the drive side. This ensures powershift capability with good efficiency despite the use of exclusively positive shifting elements for shifting gears. The differential, i.e. the planetary gear set P1, which is provided for the EDL shifting modes, runs in the gears as a block and is thus interlocked.

[0031] According to Fig. 1c, in a first gear, the first switching element A1, the second switching element B1 and the fifth switching element E1 are closed and the fourth switching element D1 and the third switching element H1 are open.

[0032] To initiate an EDS2 shift mode from first gear, the second shift element B1 is first opened, then the fourth shift element D1 is closed and then the fifth shift element E1 is opened.

[0033] To initiate a second gear from this EDS2 shift mode, the second shift element B1 is closed. In second gear, the first shift element A1, the second shift element B1, and the fourth shift element D1 are closed, and the fifth shift element E1 and the third shift element H1 are open.

[0034] To initiate an EDS3 shift mode from second gear, the first shift element A1 is first opened, then the third shift element H1 is closed and then the fourth shift element D1 is opened.

[0035] To initiate third gear from this EDS3 shift mode, the first shift element A1 is closed. In third gear, the first shift element A1, the second shift element B1, and the third shift element H1 are closed, and the fourth shift element D1 and the fifth shift element E1 are open. Third gear is a direct gear.

[0036] Fig. 2a shows a drive train for a vehicle according to a third embodiment with a first electric machine EM1, a second electric machine EM2 and a transmission 1. Arranged on a first axis of rotation AX1 are a first transmission input shaft W1 for connecting the first electric machine EM1, a second transmission input shaft W2 for connecting the second electric machine EM2, an output shaft W4 and a planetary gear set P1, which is drivingly connected to the two input shafts W1, W2 and has a first element P11, a second element P12 and a third element P13. The planetary gear set P1 is designed as a superposition gear, in particular as a differential. Furthermore, the first element P11 is designed as a sun gear, the second element P12 is designed as a planet carrier, and the third element P13 is designed as a ring gear.Several planetary gears are rotatably mounted on the planet carrier and mesh with the sun gear and the ring gear.

[0037] A second rotation axis AX2 is arranged parallel to the first rotation axis AX1, on which a countershaft W3, a first gear 21, a second gear 22, a third gear 23, a fourth gear 24 and a fifth gear 25 are arranged. The first gear 21 on the second rotation axis AX2 meshes with a first gear 11 on the first rotation axis AX1 and forms a first spur gear stage ST1. The second gear 22 on the second rotation axis AX2 meshes with a second gear 12 on the first rotation axis AX1 and forms a second spur gear stage ST2. The third gear 23 on the second rotation axis AX2 meshes with a third gear 13 on the first rotation axis AX1 and forms a third spur gear stage ST3, which is designed as a gear pair.The fourth gear 24 on the second rotational axis AX2 meshes with a fourth gear 14 on the first rotational axis AX1, forming a fourth spur gear stage ST4, which is designed as a gear pair. The fifth gear 25 on the second rotational axis AX2 meshes with a fifth gear 15 on the first rotational axis AX1, forming a fifth spur gear stage ST5, which is designed as a gear pair.

[0038] Furthermore, the transmission 1 comprises a first shifting element A2, which in the closed state connects the second and third gears 22, 23 on the second rotational axis AX2 in a rotationally fixed manner, a second shifting element B2, which in the closed state connects the third gear 23 on the second rotational axis AX2 to the countershaft W3 in a rotationally fixed manner, a third shifting element C2, which in the closed state connects the fourth gear 24 on the second rotational axis AX2 to the countershaft W3 in a rotationally fixed manner, a fourth shifting element H2, which in the closed state connects the output shaft W4 to the second element P12 of the planetary gear set P1 in a rotationally fixed manner, a fifth shifting element D2, which in the closed state connects the third gear 13 on the first rotational axis AX1 to the output shaft W4 in a rotationally fixed manner, a sixth shifting element E2, which in the closed state connects the fourth gear 14 on the first rotational axis AX1 to the Output shaft W4 is connected in a rotationally fixed manner,and a seventh shift element F2, which, when closed, connects the fifth gear 15 on the first rotational axis AX1 to the output shaft W4 in a rotationally fixed manner. All shift elements are designed as positive-locking claw clutches.

[0039] The first gear 11 on the first axis of rotation AX1 is rotationally fixedly connected to the third element P13 of the planetary gear set P1, wherein the second gear 12 on the first axis of rotation AX1 is rotationally fixedly connected to the second element P12 of the planetary gear set P1, wherein the first gear 21 on the second axis of rotation AX2 is rotationally fixedly connected to the countershaft W3, wherein the fifth gear 25 on the second axis of rotation AX2 is rotationally fixedly connected to the countershaft W3, wherein the first element P11 of the planetary gear set P1 is rotationally fixedly connected to the first transmission input shaft W1, wherein the third element P13 of the planetary gear set P1 is rotationally fixedly connected to the second transmission input shaft W2.

[0040] For example, the first electric machine EM1 has an output of 50 kW, and the second electric machine EM2 has an output of 100 kW. The superposition gear enables a differential function and, for example, has a stationary ratio of i=-2. In this case, five actuators (not shown in detail) are used to shift four gears with the seven shift elements A2, B2, C2, H2, D2, E2, and F2, with the shift elements H2 and E2, as well as D2 and F2, each being shifted by a common actuator. The planetary gear set P1 is arranged axially on the second electric machine EM2.

[0041] Fig. Figure 2b shows a drive train for a vehicle according to a fourth embodiment. The drive train according to Fig. 2b essentially corresponds to the drive train according to Fig. 2a, the difference between these two embodiments being that the planetary gear set P1 is arranged axially between the two electric machines EM1, EM2. Otherwise, the embodiment according to Fig. 2b of the embodiment according to Fig. 2a, to which reference is made.

[0042] A drive train according to Fig. 2a and Fig. 2b has several gears and shift modes, which are shown in the shift matrix according to Fig. 2c, wherein the respective switching elements A2, B2, C2, H2, D2, E2, F2 are listed in the columns of the switching matrix, and the respective gears and switching modes are listed in the rows of the switching matrix. The entry of a cross in a respective box of the switching matrix represents a closed state of the respective switching element A2, B2, C2, H2, D2, E2, F2, wherein the entry of a circle indicates an open state of the respective switching element A2, B2, C2, H2, D2, E2, F2. The respective subscript number next to a state of the respective switching element A2, B2, C2, H2, D2, E2, F2 illustrates the order in which the respective switching element A2, B2, C2, H2, D2, E2, F2 is opened or closed. The seven switching elements A2, B2, C2, H2, D2, E2, F2 create four gears and three electrodynamic switching modes EDS2, EDS3, EDS4.

[0043] According to Fig. 2c, in a first gear, the first switching element A2, the second switching element B2, the third switching element C2 and the seventh switching element F2 are closed and the fifth switching element D2, the sixth switching element E2 and the fourth switching element H2 are open.

[0044] To initiate an EDS2 shift mode from first gear, the third shift element C2 is first opened, then the sixth shift element E2 is closed and then the seventh shift element F2 is opened.

[0045] To initiate a second gear from this EDS2 shift mode, the third shift element C2 is closed. In second gear, the first shift element A2, the second shift element B2, the third shift element C2, and the sixth shift element E2 are closed, and the fifth shift element D2, the fourth shift element H2, and the seventh shift element F2 are open.

[0046] To initiate an EDS3 shift mode from second gear, the second shift element B2 is first opened, then the fifth shift element D2 is closed and then the sixth shift element E2 is opened.

[0047] To initiate a third gear from this EDS3 shift mode, the second shift element B2 is closed. In third gear, the first shift element A2, the second shift element B2, the third shift element C2, and the fifth shift element D2 are closed, and the fourth shift element H2, the sixth shift element E2, and the seventh shift element F2 are open.

[0048] To initiate an EDS4 shift mode from third gear, the first shift element A2 is first opened, then the fourth shift element H2 is closed and then the fifth shift element D2 is opened.

[0049] To initiate fourth gear from this EDS4 shift mode, the first shift element A2 is closed. In fourth gear, the first shift element A2, the second shift element B2, the third shift element C2, and the fourth shift element H2 are closed, and the fifth shift element D2, the sixth shift element E2, and the seventh shift element F2 are open. Fourth gear is a direct gear.

[0050] Fig. 3a shows a drive train for a vehicle according to a fifth embodiment with a first electric machine EM1, a second electric machine EM2 and a transmission 1. Arranged on a first axis of rotation AX1 are a first transmission input shaft W1 for connecting the first electric machine EM1, a second transmission input shaft W2 for connecting the second electric machine EM2, an output shaft W4 and a planetary gear set P1, which is drivingly connected to the two input shafts W1, W2 and has a first element P11, a second element P12 and a third element P13. The planetary gear set P1 is designed as a superposition gear, in particular as a differential. Furthermore, the first element P11 is designed as a sun gear, the second element P12 is designed as a planet carrier, and the third element P13 is designed as a ring gear.Several planetary gears are rotatably mounted on the planet carrier and mesh with the sun gear and the ring gear.

[0051] A second rotation axis AX2 is arranged parallel to the first rotation axis AX1, on which a countershaft W3, a first gear 21, a second gear 22, a third gear 23, a fourth gear 24 and a fifth gear 25 are arranged. The first gear 21 on the second rotation axis AX2 meshes with a first gear 11 on the first rotation axis AX1 and forms a first spur gear stage ST1. The second gear 22 on the second rotation axis AX2 meshes with a second gear 12 on the first rotation axis AX1 and forms a second spur gear stage ST2. The third gear 23 on the second rotation axis AX2 meshes with a third gear 13 on the first rotation axis AX1 and forms a third spur gear stage ST3, which is designed as a gear pair.The fourth gear 24 on the second rotational axis AX2 meshes with a fourth gear 14 on the first rotational axis AX1, forming a fourth spur gear stage ST4, which is designed as a gear pair. The fifth gear 25 on the second rotational axis AX2 meshes with a fifth gear 15 on the first rotational axis AX1, forming a fifth spur gear stage ST5, which is designed as a gear pair.

[0052] Furthermore, the transmission 1 comprises a first shifting element B3, which in the closed state connects the third and fourth gears 23, 24 on the second rotational axis AX2 in a rotationally fixed manner, a second shifting element C3, which in the closed state connects the fourth gear 24 on the second rotational axis AX2 to the countershaft W3 in a rotationally fixed manner, a third shifting element H3, which in the closed state connects the output shaft W4 to the third element P13 of the planetary gear set P1 in a rotationally fixed manner, a fourth shifting element D3, which in the closed state connects the fifth gear 15 on the first rotational axis AX1 to the output shaft W4 in a rotationally fixed manner, a fifth shifting element E3, which in the closed state connects the fourth gear 14 on the first rotational axis AX1 to the output shaft W4 in a rotationally fixed manner, and a sixth shifting element F3, which in the closed state connects the third gear 13 on the first rotational axis AX1 to the Output shaft W4 is connected in a rotationally fixed manner.All switching elements are designed as positive-locking claw clutches.

[0053] The first gear 11 on the first axis of rotation AX1 is rotationally fixedly connected to the second element P12 of the planetary gear set P1, wherein the second gear 12 on the first axis of rotation AX1 is rotationally fixedly connected to the third element P13 of the planetary gear set P1, wherein the first gear 21 on the second axis of rotation AX2 is rotationally fixedly connected to the countershaft W3, wherein the second and third gears 22, 23 on the second axis of rotation AX2 are rotationally fixedly connected, wherein the fifth gear 25 on the second axis of rotation AX2 is rotationally fixedly connected to the countershaft W3, wherein the first element P11 of the planetary gear set P1 is rotationally fixedly connected to the first transmission input shaft W1, wherein the third element P13 of the planetary gear set P1 is rotationally fixedly connected to the second transmission input shaft W2.

[0054] In this case, four actuators (not shown in detail) are used to shift four gears with the six shift elements B3, C3, H3, D3, E3, F3, whereby the shift elements H3 and E3 as well as F3 and D3 are each shifted by a common actuator. The planetary gear set P1 projects axially into the first electric machine EM1 and is at least partially arranged within the first electric machine EM1. Thus, the first electric machine EM1 and the planetary gear set P1 are radially stacked. The second transmission input shaft W2 is designed as a central shaft. The first transmission input shaft W1 is designed as a hollow shaft. The planet carrier sums the drive power of the two electric machines EM1, EM2.

[0055] The drive train according to Fig. 3a has several gears and shift modes, which are shown in the shift matrix according to Fig. 3b, wherein the respective switching elements B3, C3, H3, D3, E3, F3 are listed in the columns of the switching matrix, and the respective gears and switching modes are listed in the rows of the switching matrix. The entry of a cross in a respective box of the switching matrix represents a closed state of the respective switching element B3, C3, H3, D3, E3, F3, wherein the entry of a circle indicates an open state of the respective switching element B3, C3, H3, D3, E3, F3. The respective subscript number next to a state of the respective switching element B3, C3, H3, D3, E3, F3 illustrates the order in which the respective switching element B3, C3, H3, D3, E3, F3 is opened or closed. The seven switching elements B3, C3, H3, D3, E3, F3 create four gears and three electrodynamic switching modes EDS2, EDS3, EDS4.

[0056] According to Fig. 3b, in a first gear, the first switching element B3, the second switching element C3 and the sixth switching element F3 are closed and the fourth switching element D3, the fifth switching element E3 and the third switching element H3 are open.

[0057] To initiate an EDS2 shift mode from first gear, the first shift element B3 is first opened, then the fifth shift element E3 is closed and then the sixth shift element F3 is opened.

[0058] To initiate a second gear from this EDS2 shift mode, the first shift element B3 is closed. In second gear, the first shift element B3, the second shift element C3, and the fifth shift element E3 are closed, and the fourth shift element D3, the third shift element H3, and the sixth shift element F3 are open.

[0059] To initiate an EDS3 shift mode from second gear, the second shift element C3 is first opened, then the fourth shift element D3 is closed and then the fifth shift element E3 is opened.

[0060] To initiate a third gear from this EDS3 shift mode, the second shift element C3 is closed. In third gear, the first shift element B3, the second shift element C3, and the fourth shift element D3 are closed, and the third shift element H3, the fifth shift element E3, and the sixth shift element F3 are open.

[0061] To initiate an EDS4 shift mode from third gear, the second shift element C3 is opened.

[0062] To engage fourth gear, the third shift element H3 is first closed, then the fourth shift element D3 is opened, and then the second shift element C3 is closed. In fourth gear, the first shift element B3, the second shift element C3, and the third shift element H3 are closed, and the fourth shift element D3, the fifth shift element E3, and the sixth shift element F3 are opened. Fourth gear is a direct gear.

[0063] Fig. 4a shows a drive train for a vehicle according to a sixth embodiment, comprising a first electric machine EM1, a second electric machine EM2, and a transmission 1. Arranged on a first rotational axis AX1 are a first transmission input shaft W1 for connecting the first electric machine EM1, a second transmission input shaft W2 for connecting the second electric machine EM2, an output shaft W4, and a planetary gear set P1, which is driveably connected to the two input shafts W1, W2 and has a first element P11, a second element P12, and a third element P13. The planetary gear set P1 is designed as a superposition gear, in particular as a differential. Furthermore, the first element P11 is designed as a sun gear, the second element P12 is designed as a planetary carrier, and the third element P13 is designed as a ring gear.Several planetary gears are rotatably mounted on the planet carrier and mesh with the sun gear and the ring gear.

[0064] Axially parallel to the first axis of rotation AX1 is a second axis of rotation AX2 on which a countershaft W3, a first gear 21, a second gear 22, a third gear 23 and a fourth gear 24 are arranged. The first gear 21 on the second axis of rotation AX2 meshes with a first gear 11 on the first axis of rotation AX1 and forms a first spur gear stage ST1, which is designed as a gear pair. The second gear 22 on the second axis of rotation AX2 meshes with a second gear 12 on the first axis of rotation AX1 and forms a second spur gear stage ST2, which is designed as a gear pair. The third gear 23 on the second axis of rotation AX2 meshes with a third gear 13 on the first axis of rotation AX1 and forms a third spur gear stage ST3, which is designed as a gear pair.The fourth gear 24 on the second rotation axis AX2 meshes with a fourth gear 14 on the first rotation axis AX1 and forms a fourth spur gear stage ST4.

[0065] Furthermore, the transmission 1 comprises a first shifting element A4, which in the closed state connects the first and second gears 11, 12 on the first rotational axis AX1 in a rotationally fixed manner, a second shifting element B4, which in the closed state connects the second and third gears 12, 13 on the first rotational axis AX1 in a rotationally fixed manner, a third shifting element C4, which in the closed state connects the third gear 13 on the first rotational axis AX1 to the second element P12 of the planetary gear set P1 in a rotationally fixed manner, a fourth shifting element H4, which in the closed state connects the output shaft W4 to the second element P12 of the planetary gear set P1 in a rotationally fixed manner, a fifth shifting element D4, which in the closed state connects the third gear 23 on the second rotational axis AX2 to the countershaft W3 in a rotationally fixed manner, a sixth shifting element E4, which in the closed state connects the second gear 22 on the second rotational axis AX2 connected to the countershaft W3 in a rotationally fixed manner,and a seventh shift element F4, which, when closed, connects the first gear 21 on the second rotational axis AX2 to the countershaft W3 in a rotationally fixed manner. All shift elements are designed as positive-locking claw clutches.

[0066] The first gear 11 on the first rotational axis AX1 is rotationally fixedly connected to the third element P13 of the planetary gear set P1, wherein the fourth gear 14 on the first rotational axis AX1 is rotationally fixedly connected to the output shaft W4, wherein the fourth gear 24 on the second rotational axis AX2 is rotationally fixedly connected to the countershaft W3, wherein the first element P11 of the planetary gear set P1 is rotationally fixedly connected to the first transmission input shaft W1, wherein the third element P13 of the planetary gear set P1 is rotationally fixedly connected to the second transmission input shaft W2.

[0067] In this case, five actuators (not shown in detail) are used to shift four gears with the seven shift elements A4, B4, C4, H4, D4, E4, and F4. The shift elements F4 and D4, as well as E4 and H4, are each shifted by a common actuator. First gear is directly connected to the base load engine.

[0068] The drive train according to Fig. 4a has several gears and shift modes, which are shown in the shift matrix according to Fig. 4b, wherein the respective switching elements A4, B4, C4, H4, D4, E4, F4 are listed in the columns of the switching matrix, and the respective gears and switching modes are listed in the rows of the switching matrix. The entry of a cross in a respective box of the switching matrix represents a closed state of the respective switching element A4, B4, C4, H4, D4, E4, F4, wherein the entry of a circle indicates an open state of the respective switching element A4, B4, C4, H4, D4, E4, F4. The respective subscript number next to a state of the respective switching element A4, B4, C4, H4, D4, E4, F4 illustrates the order in which the respective switching element A4, B4, C4, H4, D4, E4, F4 is opened or closed. The seven switching elements A4, B4, C4, H4, D4, E4, F4 are used to realize four gears and three electrodynamic switching modes EDS2, EDS3, EDS4.

[0069] According to Fig. 4b, in a first gear, the first switching element A4, the second switching element B4, the third switching element C4 and the seventh switching element F4 are closed and the fourth switching element H4, the fifth switching element D4 and the sixth switching element E4 are open.

[0070] To initiate an EDS2 shift mode from first gear, the first shift element A4 is first opened, then the sixth shift element E4 is closed and then the seventh shift element F4 is opened.

[0071] To initiate a second gear from this EDS2 shift mode, the first shift element A4 is closed. In second gear, the first shift element A4, the second shift element B4, the third shift element C4, and the sixth shift element E4 are closed, and the fourth shift element H4, the fifth shift element D4, and the seventh shift element F4 are open.

[0072] To initiate an EDS3 shift mode from second gear, the second shift element B4 is first opened, then the fifth shift element D4 is closed and then the sixth shift element E4 is opened.

[0073] To initiate a third gear from this EDS3 shift mode, the second shift element B4 is closed. In third gear, the first shift element A4, the second shift element B4, the third shift element C4, and the fifth shift element D4 are closed, and the fourth shift element H4, the sixth shift element E4, and the seventh shift element F4 are open.

[0074] To initiate an EDS4 shift mode from third gear, the third shift element C4 is first opened, then the fourth shift element H4 is closed and then the fifth shift element D4 is opened.

[0075] To initiate fourth gear from this EDS4 shift mode, the third shift element C4 is closed. In fourth gear, the first shift element A4, the second shift element B4, the third shift element C4, and the fourth shift element H4 are closed, and the fifth shift element D4, the sixth shift element E4, and the seventh shift element F4 are open. Fourth gear is a direct gear.

[0076] An EDS cascade circuit is described using this embodiment as an example. This also functions in a similar manner in the other embodiments.

[0077] To start, first gear is engaged on the main shaft and all idler gears on the countershaft. This means that both electric motors EM1 and EM2 are synchronously coupled to first gear and can each drive at any desired power level.

[0078] If the load on the first electric machine EM1 is reduced and the power is generated solely by the second electric machine EM2 via its power path, the next shift on the gear train in the direction of the planetary gear set P1 can be opened without load and the planetary gear set P1 can be shifted further. The speed at the first electric machine EM1 is reduced in order to generate the connecting speed for the next 2nd gear at the output of the planetary gear set P1. After the shift, the power path of the planetary gear set P1 can take over the entire load. By disengaging the relieved 1st gear, the direct connection to the second electric machine EM2 can now be decoupled. By compensating the two electric machines EM1, EM2 under load, synchronization can be achieved and the second electric machine EM2 can be shifted into 2nd gear and thus pulled along.

[0079] In 2nd gear, both electric motors EM1, EM2 are synchronously coupled to the 2nd gear and can drive with any power.

[0080] If the load on the first electric machine EM1 is reduced and the power is generated solely by the second electric machine EM2 via its power path, the next shift on the countershaft W3 in the direction of the planetary gear set P1 can be opened without load and the planetary gear set P1 can be shifted further. The speed at the first electric machine EM1 is reduced in order to generate the connecting speed for the next 3rd gear at the output of the planetary gear set P1. After the shift, the power path of the planetary gear set P1 can take over the entire load. By disengaging the load-free 2nd gear, the direct connection to the second electric machine EM2 can now be decoupled. By compensating the two electric machines EM1 and EM2 under load, synchronization can be achieved and the second electric machine EM2 can be shifted into 3rd gear and thus pulled along.

[0081] In 3rd gear, both electric motors EM1, EM2 are synchronously coupled to the 3rd gear and can drive with any power.

[0082] If the load on the first electric machine EM1 is reduced and the power is generated solely by the second electric machine EM2 via its power path, the next shift on the countershaft W3 in the direction of the planetary gear set P1 can be opened without load and the planetary gear set P1 can be shifted further. The speed at EM1 is reduced in order to generate the connecting speed for the next 4th gear at the output of the differential. After the shift, the power path of the planetary gear set P1 can take over the entire load. By disengaging the load-free 3rd gear, the direct connection to the second electric machine EM2 can now be decoupled. By compensating the two electric machines EM1 and EM2 under load, synchronization can be achieved and the second electric machine EM2 can be shifted into 4th gear and thus pulled along.

[0083] In 4th gear, which is designed as a direct gear, both electric machines EM1, EM2 are coupled to the planetary gear set P1 in the block and can each drive with any power.

[0084] Fig. 5a shows a drive train for a vehicle according to a seventh embodiment, comprising a first electric machine EM1, a second electric machine EM2, and a transmission 1. Arranged on a first rotational axis AX1 are a first transmission input shaft W1 for connecting the first electric machine EM1, a second transmission input shaft W2 for connecting the second electric machine EM2, an output shaft W4, and a planetary gear set P1, which is drivingly connected to the two input shafts W1, W2 and has a first element P11, a second element P12, and a third element P13. The planetary gear set P1 is designed as a superposition gear, in particular as a differential. Furthermore, the first element P11 is designed as a sun gear, the second element P12 is designed as a planetary carrier, and the third element P13 is designed as a ring gear.Several planetary gears are rotatably mounted on the planet carrier and mesh with the sun gear and the ring gear.

[0085] A second rotation axis AX2 is arranged parallel to the first rotation axis AX1, on which a countershaft W3, a first gear 21, a second gear 22 and a third gear 23 are arranged. The first gear 21 on the second rotation axis AX2 meshes with a first gear 11 on the first rotation axis AX1 and forms a first spur gear stage ST1, which is designed as a gear pair. The second gear 22 on the second rotation axis AX2 meshes with a second gear 12 on the first rotation axis AX1 and forms a second spur gear stage ST2, which is designed as a gear pair. The third gear 23 on the second rotation axis AX2 meshes with a third gear 13 on the first rotation axis AX1 and forms a third spur gear stage ST3.

[0086] The transmission 1 further comprises a first shifting element B5 which, in the closed state, rotationally fixedly connects the first and second gears 11, 12 on the first axis of rotation AX1, a second shifting element C5 which, in the closed state, rotationally fixedly connects the second gear 12 on the first axis of rotation AX1 to the second element P12 of the planetary gear set P1, a third shifting element H5 which, in the closed state, rotationally fixedly connects the output shaft W4 to the second element P12 of the planetary gear set P1, a fourth shifting element D5 which, in the closed state, rotationally fixedly connects the second gear 22 on the second axis of rotation AX2 to the countershaft W3, and a fifth shifting element E5 which, in the closed state, rotationally fixedly connects the first gear 21 on the second axis of rotation AX2 to the countershaft W3. All shifting elements are designed as positive-locking claw clutches.

[0087] The first gear 11 on the first rotational axis AX1 is rotationally fixedly connected to the third element P13 of the planetary gear set P1, wherein the third gear 13 on the first rotational axis AX1 is rotationally fixedly connected to the output shaft W4, wherein the third gear 23 on the second rotational axis AX2 is rotationally fixedly connected to the countershaft W3, wherein the first element P11 of the planetary gear set P1 is rotationally fixedly connected to the first transmission input shaft W1, wherein the third element P13 of the planetary gear set P1 is rotationally fixedly connected to the second transmission input shaft W2.

[0088] In this case, five actuators (not shown in detail) are used to shift four gears with the five shift elements B5, C5, H5, D5, and E5. First gear is directly connected to the base load engine.

[0089] The drive train according to Fig. 5a has several gears and shift modes, which are shown in the shift matrix according to Fig. 5b, wherein the respective switching elements B5, C5, H5, D5, E5 are listed in the columns of the switching matrix, and the respective gears and switching modes are listed in the rows of the switching matrix. By entering a cross in a respective box of the switching matrix, a closed state of the respective switching element B5, C5, H5, D5, E5 is represented, wherein the entry of a circle indicates an open state of the respective switching element B5, C5, H5, D5, E5. The respective subscript number next to a state of the respective switching element B5, C5, H5, D5, E5 illustrates the order in which the respective switching element B5, C5, H5, D5, E5 is opened or closed. By means of the five switching elements B5, C5, H5, D5, E5, three gears and two electrodynamic switching modes EDS2, EDS3 are realized.

[0090] According to Fig. 5b, in a first gear, the first switching element B5, the second switching element C5 and the fifth switching element E5 are closed and the third switching element H5 and the fourth switching element D5 are open.

[0091] To initiate an EDS2 shift mode from first gear, the first shift element B5 is first opened, then the fourth shift element D5 is closed and then the fifth shift element E5 is opened.

[0092] To initiate a second gear from this EDS2 shift mode, the first shift element B5 is closed. In second gear, the first shift element B5, the second shift element C5, and the fourth shift element D5 are closed, and the third shift element H5 and the fifth shift element E5 are open.

[0093] To initiate an EDS3 shift mode from second gear, the second shift element C5 is first opened, then the third shift element H5 is closed and then the fourth shift element D5 is opened.

[0094] To initiate third gear from this EDS3 shift mode, the second shift element C5 is closed. In third gear, the first shift element B5, the second shift element C5, and the third shift element H5 are closed, and the fourth shift element D5 and the fifth shift element E5 are open. Third gear is a direct gear.

[0095] Fig. 6a shows a drive train for a vehicle according to an eighth embodiment with a first electric machine EM1, a second electric machine EM2 and a transmission 1. Arranged on a first axis of rotation AX1 are a first transmission input shaft W1 for connecting the first electric machine EM1, a second transmission input shaft W2 for connecting the second electric machine EM2 and a planetary gear set P1, which is drivingly connected to the two drive shafts W1, W2 and has a first element P11, a second element P12 and a third element P13. The planetary gear set P1 is designed as a superposition gear, in particular as a differential. Furthermore, the first element P11 is designed as a sun gear, the second element P12 is designed as a planet carrier, and the third element P13 is designed as a ring gear.Several planetary gears are rotatably mounted on the planet carrier and mesh with the sun gear and the ring gear.

[0096] A second rotational axis AX2 is arranged parallel to the first rotational axis AX1, on which a countershaft W3, a first gear 21, a second gear 22, and a third gear 23 are arranged. The countershaft W3 is provided as the output shaft of the transmission 1. The first gear 21 on the second rotational axis AX2 meshes with a first gear 11 on the first rotational axis AX1 and forms a first spur gear stage ST1, which is designed as a gear pair. The second gear 22 on the second rotational axis AX2 meshes with a second gear 12 on the first rotational axis AX1 and forms a second spur gear stage ST2, which is designed as a gear pair. The third gear 23 on the second rotational axis AX2 meshes with a third gear 13 on the first rotational axis AX1 and forms a third spur gear stage ST3, which is designed as a gear pair.

[0097] The transmission 1 further comprises a first shifting element A6, which, in the closed state, rotationally connects the second gear 12 on the first rotational axis AX1 to the third element P13 of the planetary gear set P1, a second shifting element B6, which, in the closed state, rotationally connects the first and second gears 11, 12 on the first rotational axis AX1, a third shifting element D6, which, in the closed state, rotationally connects the first gear 21 on the second rotational axis AX2 to the countershaft W3, a fourth shifting element E6, which, in the closed state, rotationally connects the second gear 22 on the second rotational axis AX2 to the countershaft W3, and a fifth shifting element F6, which, in the closed state, rotationally connects the third gear 23 on the second rotational axis AX2 to the countershaft W3. All shifting elements are designed as positive-locking claw clutches.

[0098] The first gear 11 on the first rotational axis AX1 is rotationally fixedly connected to the second element P12 of the planetary gear set P1, wherein the third gear 13 on the first rotational axis AX1 is rotationally fixedly connected to the third element P13 of the planetary gear set P1, wherein the first element P11 of the planetary gear set P1 is rotationally fixedly connected to the first transmission input shaft W1, wherein the third element P13 of the planetary gear set P1 is rotationally fixedly connected to the second transmission input shaft W2.

[0099] In this case, four actuators (not shown in detail) are used to shift three gears with the five shift elements A6, B6, D6, E6, and F6, with the shift elements F6 and D6 being shifted by a common actuator. The planetary gear set P1 extends axially into the first electric machine EM1 and is at least partially arranged within the first electric machine EM1. Thus, the first electric machine EM1 and the planetary gear set P1 are radially stacked.

[0100] Fig. Figure 6b shows a drive train for a vehicle according to a ninth embodiment. The drive train according to Fig. 6b essentially corresponds to the drive train according to Fig. 6a, the difference between these two embodiments being that the axial order of the spur gear stages ST1, ST2, ST3 has been reversed and the planetary gear set P1 has been arranged axially next to the second electric machine EM2. Otherwise, the embodiment according to Fig. 6b of the embodiment according to Fig. 6a, to which reference is made.

[0101] A drive train according to Fig. 6a and Fig. 6b has several gears and shift modes, which are shown in the shift matrix according to Fig. 6c, wherein the respective switching elements A6, B6, D6, E6, F6 are listed in the columns of the switching matrix, and the respective gears and switching modes are listed in the rows of the switching matrix. By entering a cross in a respective box of the switching matrix, a closed state of the respective switching element A6, B6, D6, E6, F6 is represented, wherein the entry of a circle indicates an open state of the respective switching element A6, B6, D6, E6, F6. The respective subscript number next to a state of the respective switching element A6, B6, D6, E6, F6 illustrates the order in which the respective switching element A6, B6, D6, E6, F6 is opened or closed. By means of the five switching elements A6, B6, D6, E6, F6, three gears and two electrodynamic switching modes EDS2, EDS3 are realized.

[0102] According to Fig. 6c, in a first gear, the first switching element A6, the second switching element B6 and the fifth switching element F6 are closed and the third switching element D6 and the fourth switching element E6 are open.

[0103] To initiate an EDS2 shift mode from first gear, the first shift element A6 is first opened, then the fourth shift element E6 is closed and then the fifth shift element F6 is opened.

[0104] To initiate a second gear from this EDS2 shift mode, the first shift element A6 is closed. In second gear, the first shift element A6, the second shift element B6, and the fourth shift element E6 are closed, and the third shift element D6 and the fifth shift element F6 are open.

[0105] To initiate an EDS3 shift mode from second gear, the second shift element B6 is first opened, then the third shift element D6 is closed and then the fourth shift element E6 is opened.

[0106] To initiate a third gear from this EDS3 shift mode, the second shift element B6 is closed. In third gear, the first shift element A6, the second shift element B6, and the third shift element D6 are closed, and the fourth shift element E6 and the fifth shift element F6 are open.

[0107] Fig. 7a shows a drive train for a vehicle according to a tenth embodiment with a first electric machine EM1, an internal combustion engine VM, and a transmission 1. The internal combustion engine VM can be decoupled from the transmission 1, in particular from a second transmission input shaft W2, via a separating clutch K0 designed as a friction clutch. Without a drag start request, the separating clutch K0 can be designed as a dog clutch. A second electric machine, which is not shown here, can be arranged on the second transmission input shaft W2. Thus, this drive train is not designed as an electric drive train with two electric machines, but as a hybrid drive train with an internal combustion engine and at least one electric machine.

[0108] Accordingly, the second electric motor can be entirely replaced by an internal combustion engine. For example, a reverse gear can be driven by the first electric motor EM1 in an EDA driving mode, while the internal combustion engine VM is secured to the housing by an additional clutch, which is designed as a brake and is not shown here. Alternatively, the internal combustion engine can be designed as a base load machine, and the two electric motors EM1, EM2 can function as battery-independent converters. A reverse gear could then be implemented in series.

[0109] Arranged on a first rotational axis AX1 are a first transmission input shaft W1 for connecting the first electric machine EM1, a second transmission input shaft W2 for connecting the combustion engine and optionally a second electric machine EM2, and a planetary gear set P1, which is driveably connected to the two drive shafts W1, W2 and has a first element P11, a second element P12, and a third element P13. The planetary gear set P1 is designed as a superposition gear, in particular as a differential. Furthermore, the first element P11 is designed as a sun gear, the second element P12 is designed as a planet carrier, and the third element P13 is designed as a ring gear. A plurality of planetary gears, which mesh with the sun gear and the ring gear, are rotatably mounted on the planet carrier.

[0110] A second rotational axis AX2 is arranged parallel to the first rotational axis AX1, on which a countershaft W3, a first gear 21, a second gear 22, and a third gear 23 are arranged. The countershaft W3 is provided as the output shaft of the transmission 1. The first gear 21 on the second rotational axis AX2 meshes with a first gear 11 on the first rotational axis AX1 and forms a first spur gear stage ST1, which is designed as a gear pair. The second gear 22 on the second rotational axis AX2 meshes with a second gear 12 on the first rotational axis AX1 and forms a second spur gear stage ST2, which is designed as a gear pair. The third gear 23 on the second rotational axis AX2 meshes with a third gear 13 on the first rotational axis AX1 and forms a third spur gear stage ST3, which is designed as a gear pair.

[0111] Furthermore, the transmission 1 comprises a first shifting element A7, which in the closed state rotatably connects the first and second gears 11, 12 on the first rotational axis AX1, a second shifting element B7, which in the closed state rotatably connects the second and third gears 12, 13 on the first rotational axis AX1, a third shifting element C7, which in the closed state rotatably connects the third gear 13 on the first rotational axis AX1 to the third element P13 of the planetary gear set P1, a fourth shifting element D7, which in the closed state rotatably connects the third gear 23 on the second rotational axis AX2 to the countershaft W3, a fifth shifting element E7, which in the closed state rotatably connects the second gear 22 on the second rotational axis AX2 to the countershaft W3, and a sixth shifting element F7,which, when closed, connects the first gear 21 on the second rotational axis AX2 to the countershaft W3 in a rotationally fixed manner. All shifting elements are designed as positive-locking claw clutches.

[0112] The first gear 11 on the first rotational axis AX1 is rotationally fixedly connected to the second element P12 of the planetary gear set P1, wherein the first element P11 of the planetary gear set P1 is rotationally fixedly connected to the first transmission input shaft W1, wherein the third element P13 of the planetary gear set P1 is rotationally fixedly connected to the second transmission input shaft W2.

[0113] In this case, five actuators (not shown in detail) are used to shift three gears with the six shift elements A7, B7, C7, D7, E7, F7, whereby the shift elements D7 and F7 are shifted by a common actuator.

[0114] The drive train according to Fig. 7a has several gears and shift modes, which are shown in the shift matrix according to Fig. 7b, where the columns of the shift matrix list the respective shift elements A7, B7, C7, D7, E7, F7, and the rows of the shift matrix list the respective gears and shift modes. In addition, the transmission according to Fig. 7a also allows electrodynamic start-up, or EDA for short. The disconnect clutch is not shown in the shift matrix. Entering a cross in a respective box in the shift matrix indicates a closed state of the respective shift element A7, B7, C7, D7, E7, F7, whereas entering a circle indicates an open state of the respective shift element A7, B7, C7, D7, E7, F7. The respective subscript number next to a state of the respective shift element A7, B7, C7, D7, E7, F7 illustrates the sequence for opening or closing the respective shift element A7, B7, C7, D7, E7, F7. The six shift elements A7, B7, C7, D7, E7, F7 are used to implement three gears, two electrodynamic shift modes EDS2, EDS3 and one electrodynamic start-up mode EDA.

[0115] According to Fig. 7b, in an EDA driving mode, the first switching element A7, the second switching element B7 and the fourth switching element D7 are closed and the third switching element C7, the fifth switching element E7 and the sixth switching element F7 are open.

[0116] To engage first gear, the third shift element C7 is closed. In first gear, the first shift element A7, the second shift element B7, the third shift element C7, and the fourth shift element D7 are closed, and the fifth shift element E7 and the sixth shift element F7 are open.

[0117] To initiate an EDS2 shift mode from first gear, the second shift element B7 is first opened, then the fifth shift element E7 is closed and then the fourth shift element D7 is opened.

[0118] To initiate a second gear from this EDS2 shift mode, the second shift element B7 is closed. In second gear, the first shift element A7, the second shift element B7, the third shift element C7, and the fifth shift element E7 are closed, and the fourth shift element D7 and the sixth shift element F7 are open.

[0119] To initiate an EDS3 shift mode from second gear, the first shift element A7 is first opened, then the sixth shift element F7 is closed and then the fifth shift element E7 is opened.

[0120] To initiate a third gear from this EDS3 shift mode, the first shift element A7 is closed. In third gear, the first shift element A7, the second shift element B7, the third shift element C7, and the sixth shift element F7 are closed, and the fourth shift element D7 and the fifth shift element E7 are open.

[0121] Fig. Figure 8a shows a drivetrain for a vehicle according to an eleventh embodiment, comprising a first electric machine EM1, a second electric machine EM2, an internal combustion engine VM, and a transmission 1. The internal combustion engine VM can be decoupled from the transmission 1, in particular from a second transmission input shaft W2, via a separating clutch K0 configured as a friction clutch. Without a tow-start requirement, the separating clutch K0 can be configured as a dog clutch. The internal combustion engine VM is designed as a range extender and can increase the vehicle's range during operation.

[0122] Arranged on a first axis of rotation AX1 are a first transmission input shaft W1 for connecting the first electric machine EM1, a second transmission input shaft W2 for connecting the combustion engine VM and the second electric machine EM2, an output shaft W4, a first planetary gear set P1, which is driveably connected to the two input shafts W1, W2 and has a first element P11, a second element P12 and a third element P13, and a second planetary gear set P2 with a first element P21, a second element P22 and a third element P23. The first planetary gear set P1 is designed as a superposition gear, in particular as a differential. Furthermore, the first element P11 is designed as a sun gear, the second element P12 is designed as a planet carrier, and the third element P13 is designed as a ring gear.Several planetary gears are rotatably mounted on the planet carrier and mesh with the sun gear and the ring gear.

[0123] The second planetary gear set P2 is designed as a shiftable group transmission, with the first element P21 being a sun gear, the second element P22 being a planetary carrier, and the third element P23 being a ring gear. Several planetary gears are rotatably mounted on the planetary carrier and mesh with the sun gear and the ring gear.

[0124] Axially parallel to the first axis of rotation AX1 is a second axis of rotation AX2 on which a countershaft W3, a first gear 21, a second gear 22, a third gear 23 and a fourth gear 24 are arranged. The first gear 21 on the second axis of rotation AX2 meshes with a first gear 11 on the first axis of rotation AX1 and forms a first spur gear stage ST1, which is designed as a gear pair. The second gear 22 on the second axis of rotation AX2 meshes with a second gear 12 on the first axis of rotation AX1 and forms a second spur gear stage ST2, which is designed as a gear pair. The third gear 23 on the second axis of rotation AX2 meshes with a third gear 13 on the first axis of rotation AX1 and forms a third spur gear stage ST3, which is designed as a gear pair.The fourth gear 24 on the second rotational axis AX2 meshes with a fourth gear 14 on the first rotational axis AX1 and forms a fourth spur gear stage ST4, which is designed as a gear pair.

[0125] Furthermore, the transmission 1 comprises a first shifting element A8, which, in the closed state, rotationally connects the first and second gears 11, 12 on the first rotational axis AX1, a second shifting element B8, which, in the closed state, rotationally connects the second and third gears 12, 13 on the first rotational axis AX1, a third shifting element C8, which, in the closed state, rotationally connects the third gear 13 on the first rotational axis AX1 to the third element P13 of the first planetary gear set P1, a fourth shifting element D8, which, in the closed state, rotationally connects the third gear 23 on the second rotational axis AX2 to the countershaft W3, a fifth shifting element E8, which, in the closed state, rotationally connects the second gear 22 on the second rotational axis AX2 to the countershaft W3, a sixth shifting element F8,which, in the closed state, rotationally connects the first gear 21 on the second rotational axis AX2 to the countershaft W3; a seventh shifting element H8, which, in the closed state, rotationally connects the third element P13 of the first planetary gear set P1 to the first element P21 of the second planetary gear set P2; an eighth shifting element K8, which, in the closed state, rotationally connects the fourth gear 14 on the first rotational axis AX1 to the first element P21 of the second planetary gear set P2; a ninth shifting element P8, which, in the closed state, rotationally connects the fourth gear 14 on the first rotational axis AX1 to the second element P22 of the second planetary gear set P2; and a tenth shifting element G8, which, in the closed state, rotationally connects the third element of the second planetary gear set P2 to a stationary component designed as a housing 2. All shifting elements are designed as positive-locking claw clutches.

[0126] The first gear 11 on the first rotational axis AX1 is rotationally fixedly connected to the second element P12 of the first planetary gear set P1, wherein the fourth gear 24 on the second rotational axis AX2 is rotationally fixedly connected to the countershaft W3, wherein the second element P22 of the second planetary gear set P2 is rotationally fixedly connected to the output shaft W4, wherein the first element P11 of the first planetary gear set P1 is rotationally fixedly connected to the first transmission input shaft W1, wherein the third element P13 of the first planetary gear set P1 is rotationally fixedly connected to the second transmission input shaft W2.

[0127] In this case, eight actuators (not shown in detail) are used to shift six gears with the ten shift elements A8, B8, C8, D8, E8, F8, H8, K8, P8, G8, whereby the shift elements D8 and F8 are switched by a common actuator.

[0128] The drive train according to Fig. 8a has several gears and shift modes, which are shown in the shift matrix according to Fig. 8b, where the columns of the shift matrix list the respective shift elements A8, B8, C8, D8, E8, F8, H8, K8, P8, G8, and the rows of the shift matrix list the respective gears and shift modes. In addition, the transmission according to Fig. 8a also enables electrodynamic starting, or EDA for short. The separating clutch is not shown in the switching matrix. Entering a cross in a respective box in the switching matrix represents a closed state of the respective switching element A8, B8, C8, D8, E8, F8, H8, K8, P8, G8, whereas entering a circle indicates an open state of the respective switching element A8, B8, C8, D8, E8, F8, H8, K8, P8, G8. The respective subscript number next to a state of the respective switching element A8, B8, C8, D8, E8, F8, H8, K8, P8, G8 illustrates the sequence in which the respective switching element A8, B8, C8, D8, E8, F8, H8, K8, P8, G8 is opened or closed. The ten switching elements A8, B8, C8, D8, E8, F8, H8, K8, P8, G8 are used to realize six gears, five electrodynamic switching modes EDS2, EDS3, EDS4, EDS5, EDS6 and one electrodynamic starting mode EDA.

[0129] According to Fig. 7b, in an EDA driving mode, the first switching element A8, the second switching element B8, the fourth switching element D8, the eighth switching element K8 and the tenth switching element G8 are closed and the third switching element C8, the fifth switching element E8, the sixth switching element F8, the seventh switching element H8 and the ninth switching element P8 are open.

[0130] To engage first gear from EDA driving mode, the third shift element C8 is closed. In first gear, the first shift element A8, the second shift element B8, the third shift element C8, the fourth shift element D8, the eighth shift element K8, and the tenth shift element G8 are closed, and the fifth shift element E8, the sixth shift element F8, the seventh shift element H8, and the ninth shift element P8 are opened.

[0131] To initiate an EDS2 shift mode from first gear, the second shift element B8 is first opened, then the fifth shift element E8 is closed and then the fourth shift element D8 is opened.

[0132] To initiate a second gear from this EDS2 shift mode, the second shift element B8 is closed. In second gear, the first shift element A8, the second shift element B8, the third shift element C8, the fifth shift element E8, the eighth shift element K8, and the tenth shift element G8 are closed, and the fourth shift element D8, the sixth shift element F8, the seventh shift element H8, and the ninth shift element P8 are open.

[0133] To initiate an EDS3 shift mode from second gear, the first shift element A8 is first opened, then the sixth shift element F8 is closed and then the fifth shift element E8 is opened.

[0134] To initiate a third gear from this EDS3 shift mode, the seventh shift element H8 is closed. In third gear, the second shift element B8, the third shift element C8, the sixth shift element F8, the seventh shift element H8, the eighth shift element K8, and the tenth shift element G8 are closed, and the first shift element A8, the fourth shift element D8, the fifth shift element E8, and the ninth shift element P8 are open.

[0135] To initiate an EDS4 shift mode from third gear, first the eighth shift element K8 is opened, then the ninth shift element P8 is closed, then the sixth shift element F8 is opened, then the first shift element A8 is closed, then the third shift element C8 is opened, then the fourth shift element D8 is closed and then the tenth shift element G8 is opened.

[0136] To initiate fourth gear from this EDS4 shift mode, the eighth shift element K8 is closed, then the seventh shift element H8 is opened, and then the third shift element C8 is closed. In fourth gear, the first shift element A8, the second shift element B8, the third shift element C8, the fourth shift element D8, the eighth shift element K8, and the ninth shift element P8 are closed, and the fifth shift element E8, the sixth shift element F8, the seventh shift element H8, and the tenth shift element G8 are opened.

[0137] To initiate an EDS5 shift mode from fourth gear, the second shift element B8 is first opened, then the fifth shift element E8 is closed and then the fourth shift element D8 is opened.

[0138] To initiate a fifth gear from this EDS5 shift mode, the second shift element B8 is closed. In fifth gear, the first shift element A8, the second shift element B8, the third shift element C8, the fifth shift element E8, the eighth shift element K8, and the ninth shift element P8 are closed, and the fourth shift element D8, the sixth shift element F8, the seventh shift element H8, and the tenth shift element G8 are open.

[0139] To initiate an EDS6 shift mode from fifth gear, the first shift element A8 is first opened, then the sixth shift element F8 is closed and then the fifth shift element E8 is opened.

[0140] To initiate sixth gear from this EDS6 shift mode, the seventh shift element H8 is closed, then the sixth shift element F8 is opened, and then the first shift element A8 is closed. In sixth gear, the first shift element A8, the second shift element B8, the third shift element C8, the seventh shift element H8, the eighth shift element K8, and the ninth shift element P8 are closed, and the fourth shift element D8, the fifth shift element E8, the sixth shift element F8, and the tenth shift element G8 are opened.

[0141] Fig. 9a shows a drive train for a vehicle according to a twelfth embodiment with a first electric machine EM1, a second electric machine EM2 and a transmission 1. On a first axis of rotation AX1 there are arranged a first transmission input shaft W1 for connecting the first electric machine EM1, a second transmission input shaft W2 for connecting the second electric machine EM2, an output shaft W4, a first planetary gear set P1, which is drivingly connected to the two input shafts W1, W2 and has a first element P11, a second element P12 and a third element P13, and a second planetary gear set P2 with a first element P21, a second element P22 and a third element P23.The first planetary gear set P1 is designed as a superposition gear, in particular as a differential, with the first element P11 being designed as a sun gear, the second element P12 being designed as a planet carrier, and the third element P13 being designed as a ring gear. Several planetary gears are rotatably mounted on the planet carrier and mesh with the sun gear and the ring gear.

[0142] The second planetary gear set P2 is designed as a shiftable group transmission, with the first element P21 being a sun gear, the second element P22 being a planetary carrier, and the third element P23 being a ring gear. Several planetary gears are rotatably mounted on the planetary carrier and mesh with the sun gear and the ring gear.

[0143] A second rotation axis AX2 is arranged parallel to the first rotation axis AX1, on which a countershaft W3, a first gear 21, a second gear 22, a third gear 23, a fourth gear 24 and a fifth gear 25 are arranged. The first gear 21 on the second rotation axis AX2 meshes with a first gear 11 on the first rotation axis AX1 and forms a first spur gear stage ST1. The second gear 22 on the second rotation axis AX2 meshes with a second gear 12 on the first rotation axis AX1 and forms a second spur gear stage ST2. The third gear 23 on the second rotation axis AX2 meshes with a third gear 13 on the first rotation axis AX1 and forms a third spur gear stage ST3, which is designed as a gear pair.The fourth gear 24 on the second rotational axis AX2 meshes with a fourth gear 14 on the first rotational axis AX1, forming a fourth spur gear stage ST4, which is designed as a gear pair. The fifth gear 25 on the second rotational axis AX2 meshes with a fifth gear 15 on the first rotational axis AX1, forming a fifth spur gear stage ST5, which is designed as a gear pair.

[0144] Furthermore, the transmission 1 comprises a first shifting element A9, which, in the closed state, rotationally connects the fourth gear 24 on the second rotational axis AX2 to the countershaft W3, a second shifting element B9, which, in the closed state, rotationally connects the third and fourth gears 23, 24 on the second rotational axis AX2, a third shifting element C9, which, in the closed state, rotationally connects the second and third gears 22, 23 on the second rotational axis AX2, a fourth shifting element H9, which, in the closed state, rotationally connects the second element P12 of the first planetary gear set P1 to the first element P21 of the second planetary gear set P2, a fifth shifting element D9, which, in the closed state, rotationally connects the third gear 13 on the first rotational axis AX1 to the first element P21 of the second planetary gear set P2, a sixth shifting element E9,which, in the closed state, rotationally connects the fourth gear 14 on the first rotational axis AX1 to the first element P21 of the second planetary gear set P2; a seventh shifting element F9, which, in the closed state, rotationally connects the fifth gear 15 on the first rotational axis AX1 to the first element P21 of the second planetary gear set P2; an eighth shifting element P9, which, in the closed state, rotationally connects the fifth gear 15 on the first rotational axis AX1 to the second element P22 of the second planetary gear set P2; a ninth shifting element L9, which, in the closed state, rotationally connects the first element P21 of the second planetary gear set P2 to the second element P22 of the second planetary gear set P2; a tenth shifting element G9, which, in the closed state, rotationally connects the third element of the second planetary gear set P2 to a stationary component. All shifting elements are designed as positive-locking claw clutches.

[0145] The first gear 11 on the first axis of rotation AX1 is rotationally fixedly connected to the third element P13 of the first planetary gear set P1, wherein the second gear 12 on the first axis of rotation AX1 is rotationally fixedly connected to the second element P12 of the first planetary gear set P1, wherein the second gear 22 on the second axis of rotation AX2 is rotationally fixedly connected to the countershaft W3, wherein the fifth gear 25 on the second axis of rotation AX2 is rotationally fixedly connected to the countershaft W3, wherein the second element P22 of the second planetary gear set P2 is rotationally fixedly connected to the output shaft W4, wherein the first element P11 of the first planetary gear set P1 is rotationally fixedly connected to the first transmission input shaft W1, wherein the third element P13 of the first planetary gear set P1 is rotationally fixedly connected to the second transmission input shaft W2.

[0146] In the present case, seven actuators (not shown in detail) are used to shift seven gears with the ten shift elements A9, B9, C9, H9, D9, E9, F9, P9, L9, G9, whereby the shift elements H9 and E9, L9 and G9 as well as D9 and F9 are each shifted by a common actuator.

[0147] The drive train according to Fig. 9a has several gears and shift modes, which are shown in the shift matrix according to Fig. 9b, wherein the respective switching elements A9, B9, C9, H9, D9, E9, F9, P9, L9, G9 are listed in the columns of the switching matrix, and wherein the respective gears and switching modes are listed in the rows of the switching matrix. By entering a cross in a respective box of the switching matrix, a closed state of the respective switching element A9, B9, C9, H9, D9, E9, F9, P9, L9, G9 is represented, wherein the entry of a circle indicates an open state of the respective switching element A9, B9, C9, H9, D9, E9, F9, P9, L9, G9. The respective subscript number for a state of the respective switching element A9, B9, C9, H9, D9, E9, F9, P9, L9, G9 illustrates the sequence for opening or closing the respective switching element A9, B9, C9, H9, D9, E9, F9, P9, L9, G9. Seven gears and six electrodynamic switching modes (EDS2, EDS3, EDS4, EDS5, EDS6, EDS7) are realized using the ten switching elements A9, B9, C9, H9, D9, E9, F9, P9, L9, G9.

[0148] According to Fig. 9b, in a first gear, the first switching element A9, the second switching element B9, the third switching element C9, the seventh switching element F9 and the tenth switching element G9 are closed and the fourth switching element H9, the fifth switching element D9, the sixth switching element E9, the eighth switching element P9 and the ninth switching element L9 are open.

[0149] To initiate an EDS2 shift mode from first gear, the first shift element A9 is first opened, then the sixth shift element E9 is closed and then the seventh shift element F9 is opened.

[0150] To initiate a second gear from this EDS2 shift mode, the first shift element A9 is closed. In second gear, the first shift element A9, the second shift element B9, the third shift element C9, the sixth shift element E9, and the tenth shift element G9 are closed, and the fourth shift element H9, the fifth shift element D9, the seventh shift element F9, the eighth shift element P9, and the ninth shift element L9 are open.

[0151] To initiate an EDS3 shift mode from second gear, the second shift element B9 is first opened, then the fifth shift element D9 is closed and then the sixth shift element E9 is opened.

[0152] To initiate a third gear from this EDS3 shift mode, the second shift element B9 is closed. In third gear, the first shift element A9, the second shift element B9, the third shift element C9, the fifth shift element D9, and the tenth shift element G9 are closed, and the fourth shift element H9, the sixth shift element E9, the seventh shift element F9, the eighth shift element P9, and the ninth shift element L9 are open.

[0153] To initiate an EDS4 shift mode from third gear, the third shift element C9 is first opened, then the fourth shift element H9 is closed and then the fifth shift element D9 is opened.

[0154] To initiate fourth gear from this EDS4 shift mode, the eighth shift element P8 is closed. In fourth gear, the first shift element A9, the second shift element B9, the fourth shift element H9, the eighth shift element P9, and the tenth shift element G9 are closed, and the third shift element C9, the fifth shift element D9, the sixth shift element E9, the seventh shift element F9, and the ninth shift element L9 are open.

[0155] To initiate an EDS5 shift mode from fourth gear, first the tenth shift element G9 is opened, then the ninth shift element L9 is closed, then the fourth shift element H9 is opened, then the third shift element C9 is closed, then the first shift element A9 is opened, then the sixth shift element E9 is closed and then the eighth shift element P9 is opened.

[0156] To initiate a fifth gear from this EDS5 shift mode, the first shift element A9 is closed. In fifth gear, the first shift element A9, the second shift element B9, the third shift element C9, the sixth shift element E9, and the ninth shift element L9 are closed, and the fourth shift element H9, the fifth shift element D9, the seventh shift element F9, the eighth shift element P9, and the tenth shift element G9 are open.

[0157] To initiate an EDS6 shift mode from fifth gear, the second shift element B9 is first opened, then the fifth shift element D9 is closed and then the sixth shift element E9 is opened.

[0158] To initiate a sixth gear from this EDS6 shift mode, the second shift element B9 is closed. In sixth gear, the first shift element A9, the second shift element B9, the third shift element C9, the fifth shift element D9, and the ninth shift element L9 are closed, and the fourth shift element H9, the sixth shift element E9, the seventh shift element F9, the eighth shift element P9, and the tenth shift element G9 are open.

[0159] To initiate an EDS7 shift mode from sixth gear, the third shift element C9 is first opened, then the fourth shift element H9 is closed and then the fifth shift element D9 is opened.

[0160] To initiate a seventh gear from this EDS7 shift mode, the third shift element C9 is closed. In seventh gear, the first shift element A9, the second shift element B9, the third shift element C9, the fourth shift element H9, and the ninth shift element L9 are closed, and the fifth shift element D9, the sixth shift element E9, the seventh shift element F9, the eighth shift element P9, and the tenth shift element G9 are open. Seventh gear is a direct gear. Reference symbol 1 gearbox 2 housings AX1 first rotation axis AX2 second rotation axis P1 first planetary gear set P11 first element of the first planetary gear set P12 second element of the first planetary gear set P13 third element of the first planetary gear set P2 second planetary gear set P21 first element of the second planetary gear set P22 second element of the second planetary gear set P23 third element of the second planetary gear set W1 first transmission input shaft W2 second transmission input shaft W3 countershaft W4 output shaft VM combustion engine K0 separating clutch EM1 first electric machine EM2 second electric machine ST1 first spur gear stage 11 first gear on the first rotation axis 21 first gear on the second rotation axis ST2 second spur gear stage 12 second gear on the first rotation axis 22 second gear on the second rotation axis ST3 third spur gear stage 13 third gear on the first rotation axis 23 third gear on the second rotation axis ST4 fourth spur gear stage 14 fourth gear on the first rotation axis 24 fourth gear on the second rotation axis ST5 fifth spur gear stage 15 fifth gear on the first rotation axis 25 fifth gear on the second rotation axis A1, A2, B3, A4, B5, A6, A7, A8, A9 first switching element B1, B2, C3, B4, C5, B6, B7, B8, B9 second switching element H1, C2, H3, C4, H5, D6, C7, C8, C9 third switching element D1, H2, D3, H4, D5, E6, D7, D8, H9 fourth switching element E1, D2, E3, D4, E5, F6, E7, E8, D9 fifth switching element E2, F3, E4, F7, F8, E9 sixth switching element F2, F4, H8, F9 seventh switching element K8, P9 eighth switching element P8, L9 ninth switching element G8, G9 tenth switching element

Claims

[1] Transmission (1) for a drive train of a vehicle, comprising • a first transmission input shaft (W1) arranged on a first rotational axis (AX1) for connecting a first electric machine (EM1), • a second transmission input shaft (W2) arranged on the first rotation axis (AX1) for connecting a second electric machine (EM2), • at least one planetary gear set (P1) arranged on the first rotational axis (AX1) and connected to the two drive shafts (W1, W2) in a driving manner and designed as a superposition gear, with a first element (P11), a second element (P12) and a third element (P13), • a second rotational axis (AX2) arranged axially parallel to the first rotational axis (AX1) on which a countershaft (W3), a first gear (21), a second gear (22), a third gear (23) and a fourth gear (24) are arranged, • wherein the first gear (21) on the second rotational axis (AX2) meshes with a first gear (11) on the first rotational axis (AX1) and forms a first spur gear stage (ST1), • wherein the second gear (22) on the second rotational axis (AX2) meshes with a second gear (12) on the first rotational axis (AX1) and forms a second spur gear stage (ST2), • wherein the third gear (23) on the second rotational axis (AX2) meshes with a third gear (13) on the first rotational axis (AX1) and forms a third spur gear stage (ST3), • wherein the fourth gear (24) on the second rotational axis (AX2) meshes with a fourth gear (14) on the first rotational axis (AX1) and forms a fourth spur gear stage (ST4), • an output shaft (W4) arranged on the first rotation axis (AX1), • a first switching element (A1) which, in the closed state, connects the second and third gear wheels (22, 23) on the second rotation axis (AX2) in a rotationally fixed manner, • a second switching element (B1) which, in the closed state, connects the third gear (23) on the second rotation axis (AX2) to the countershaft (W3) in a rotationally fixed manner, • a third switching element (H1) which, when closed, connects the output shaft (W4) to the second element (P12) of the planetary gear set (P1) in a rotationally fixed manner, • a fourth switching element (D1) which, in the closed state, connects the third gear (13) on the first rotation axis (AX1) to the output shaft (W4) in a rotationally fixed manner, • a fifth switching element (E1) which, in the closed state, connects the fourth gear (14) on the first rotation axis (AX1) to the output shaft (W4) in a rotationally fixed manner, • wherein the first gear (11) is connected on the first rotation axis (AX1) to the third element (P13) of the planetary gear set (P1) in a rotationally fixed manner, • wherein the second gear (12) is connected on the first rotation axis (AX1) to the second element (P12) of the planetary gear set (P1) in a rotationally fixed manner, • wherein the first gear (21) is connected in a rotationally fixed manner to the countershaft (W3) on the second rotation axis (AX2), • wherein the fourth gear (24) on the second rotation axis (AX2) is connected in a rotationally fixed manner to the countershaft (W3), • wherein the first element (P11) of the planetary gear set (P1) is connected in a rotationally fixed manner to the first transmission input shaft (W1), • wherein the third element (P13) of the planetary gear set (P1) is connected in a rotationally fixed manner to the second transmission input shaft (W2). [2] Method for setting gears and EDS shift modes for a transmission (1) according to claim 1, • wherein in a first gear, the first switching element (A1), the second switching element (B1) and the fifth switching element (E1) are closed and the fourth switching element (D1) and the third switching element (H1) are open, • to initiate an EDS2 shift mode from the first gear, the second shift element (B1) is first opened, then the fourth shift element (D1) is closed and then the fifth shift element (E1) is opened, to initiate a second gear from this EDS2 shift mode, the second shift element (B1) is closed, • in second gear, the first switching element (A1), the second switching element (B1) and the fourth switching element (D1) are closed and the fifth switching element (E1) and the third switching element (H1) are open, • to initiate an EDS3 shift mode from the second gear, the first shift element (A1) is first opened, then the third shift element (H1) is closed and then the fourth shift element (D1) is opened, to initiate a third gear from this EDS3 shift mode, the first shift element (A1) is closed, • wherein in third gear the first switching element (A1), the second switching element (B1) and the third switching element (H1) are closed and the fourth switching element (D1) and the fifth switching element (E1) are open. [3] Transmission (1) for a drive train of a vehicle, comprising • a first transmission input shaft (W1) arranged on a first rotational axis (AX1) for connecting a first electric machine (EM1), • a second transmission input shaft (W2) arranged on the first rotation axis (AX1) for connecting a second electric machine (EM2), • at least one planetary gear set (P1) arranged on the first rotational axis (AX1) and connected to the two drive shafts (W1, W2) in a driving manner and designed as a superposition gear, with a first element (P11), a second element (P12) and a third element (P13), • a second rotational axis (AX2) arranged axially parallel to the first rotational axis (AX1), on which a countershaft (W3), a first gear (21), a second gear (22), a third gear (23), a fourth gear (24) and a fifth gear (25) are arranged, • wherein the first gear (21) on the second rotational axis (AX2) meshes with a first gear (11) on the first rotational axis (AX1) and forms a first spur gear stage (ST1), • wherein the second gear (22) on the second rotational axis (AX2) meshes with a second gear (12) on the first rotational axis (AX1) and forms a second spur gear stage (ST2), • wherein the third gear (23) on the second rotational axis (AX2) meshes with a third gear (13) on the first rotational axis (AX1) and forms a third spur gear stage (ST3), • wherein the fourth gear (24) on the second rotational axis (AX2) meshes with a fourth gear (14) on the first rotational axis (AX1) and forms a fourth spur gear stage (ST4), • wherein the fifth gear (25) on the second rotational axis (AX2) meshes with a fifth gear (15) on the first rotational axis (AX1) and forms a fifth spur gear stage (ST5), • an output shaft (W4) arranged on the first rotation axis (AX1), • a first switching element (A2) which, in the closed state, connects the second and third gear wheels (22, 23) on the second rotation axis (AX2) in a rotationally fixed manner, • a second switching element (B2) which, in the closed state, connects the third gear (23) on the second rotation axis (AX2) to the countershaft (W3) in a rotationally fixed manner, • a third switching element (C2) which, in the closed state, connects the fourth gear (24) on the second rotation axis (AX2) to the countershaft (W3) in a rotationally fixed manner, • a fourth switching element (H2) which, when closed, connects the output shaft (W4) to the second element (P12) of the planetary gear set (P1) in a rotationally fixed manner, • a fifth switching element (D2) which, in the closed state, connects the third gear (13) on the first rotation axis (AX1) to the output shaft (W4) in a rotationally fixed manner, • a sixth switching element (E2) which, in the closed state, connects the fourth gear (14) on the first rotation axis (AX1) to the output shaft (W4) in a rotationally fixed manner, • a seventh switching element (F2) which, in the closed state, connects the fifth gear (15) on the first rotation axis (AX1) to the output shaft (W4) in a rotationally fixed manner, • wherein the first gear (11) is connected on the first rotation axis (AX1) to the third element (P13) of the planetary gear set (P1) in a rotationally fixed manner, • wherein the second gear (12) is connected on the first rotation axis (AX1) to the second element (P12) of the planetary gear set (P1) in a rotationally fixed manner, • wherein the first gear (21) is connected in a rotationally fixed manner to the countershaft (W3) on the second rotation axis (AX2), • wherein the fifth gear (25) on the second rotation axis (AX2) is connected in a rotationally fixed manner to the countershaft (W3), • wherein the first element (P11) of the planetary gear set (P1) is connected in a rotationally fixed manner to the first transmission input shaft (W1), • wherein the third element (P13) of the planetary gear set (P1) is connected in a rotationally fixed manner to the second transmission input shaft (W2). [4] Method for setting gears and EDS shift modes for a transmission (1) according to claim 3, • wherein in a first gear, the first switching element (A2), the second switching element (B2), the third switching element (C2) and the seventh switching element (F2) are closed and the fifth switching element (D2), the sixth switching element (E2) and the fourth switching element (H2) are open, • to initiate an EDS2 shift mode from the first gear, the third shift element (C2) is first opened, then the sixth shift element (E2) is closed and then the seventh shift element (F2) is opened, to initiate a second gear from this EDS2 shift mode, the third shift element (C2) is closed, • wherein in second gear the first switching element (A2), the second switching element (B2), the third switching element (C2) and the sixth switching element (E2) are closed and the fifth switching element (D2), the fourth switching element (H2) and the seventh switching element (F2) are open, • to initiate an EDS3 shift mode from the second gear, the second shift element (B2) is first opened, then the fifth shift element (D2) is closed and then the sixth shift element (E2) is opened, to initiate a third gear from this EDS3 shift mode, the second shift element (B2) is closed, • in third gear, the first switching element (A2), the second switching element (B2), the third switching element (C2) and the fifth switching element (D2) are closed and the fourth switching element (H2), the sixth switching element (E2) and the seventh switching element (F2) are open, • to initiate an EDS4 shift mode from the third gear, the first shift element (A2) is first opened, then the fourth shift element (H2) is closed and then the fifth shift element (D2) is opened, to initiate a fourth gear from this EDS4 shift mode, the first shift element (A2) is closed, • wherein in fourth gear the first switching element (A2), the second switching element (B2), the third switching element (C2) and the fourth switching element (H2) are closed and the fifth switching element (D2), the sixth switching element (E2) and the seventh switching element (F2) are open. [5] Transmission (1) for a drive train of a vehicle, comprising • a first transmission input shaft (W1) arranged on a first rotational axis (AX1) for connecting a first electric machine (EM1), • a second transmission input shaft (W2) arranged on the first rotation axis (AX1) for connecting a second electric machine (EM2), • at least one planetary gear set (P1) arranged on the first rotational axis (AX1) and connected to the two drive shafts (W1, W2) in a driving manner and designed as a superposition gear, with a first element (P11), a second element (P12) and a third element (P13), • a second rotational axis (AX2) arranged axially parallel to the first rotational axis (AX1), on which a countershaft (W3), a first gear (21), a second gear (22), a third gear (23), a fourth gear (24) and a fifth gear (25) are arranged, • wherein the first gear (21) on the second rotational axis (AX2) meshes with a first gear (11) on the first rotational axis (AX1) and forms a first spur gear stage (ST1), • wherein the second gear (22) on the second rotational axis (AX2) meshes with a second gear (12) on the first rotational axis (AX1) and forms a second spur gear stage (ST2), • wherein the third gear (23) on the second rotational axis (AX2) meshes with a third gear (13) on the first rotational axis (AX1) and forms a third spur gear stage (ST3), • wherein the fourth gear (24) on the second rotational axis (AX2) meshes with a fourth gear (14) on the first rotational axis (AX1) and forms a fourth spur gear stage (ST4), • wherein the fifth gear (25) on the second rotational axis (AX2) meshes with a fifth gear (15) on the first rotational axis (AX1) and forms a fifth spur gear stage (ST5), • an output shaft (W4) arranged on the first rotation axis (AX1), • a first switching element (B3) which, in the closed state, connects the third and fourth gear wheels (23, 24) on the second rotation axis (AX2) in a rotationally fixed manner, • a second switching element (C3) which, in the closed state, connects the fourth gear (24) on the second rotation axis (AX2) to the countershaft (W3) in a rotationally fixed manner, • a third switching element (H3) which, when closed, connects the output shaft (W4) to the third element (P13) of the planetary gear set (P1) in a rotationally fixed manner, • a fourth switching element (D3) which, in the closed state, connects the fifth gear (15) on the first rotation axis (AX1) to the output shaft (W4) in a rotationally fixed manner, • a fifth switching element (E3) which, in the closed state, connects the fourth gear (14) on the first rotation axis (AX1) to the output shaft (W4) in a rotationally fixed manner, • a sixth switching element (F3) which, in the closed state, connects the third gear (13) on the first rotation axis (AX1) to the output shaft (W4) in a rotationally fixed manner, • wherein the first gear (11) is connected in a rotationally fixed manner to the second element (P12) of the planetary gear set (P1) on the first rotation axis (AX1), • wherein the second gear (12) is connected on the first rotation axis (AX1) to the third element (P13) of the planetary gear set (P1) in a rotationally fixed manner, • wherein the first gear (21) is connected in a rotationally fixed manner to the countershaft (W3) on the second rotation axis (AX2), • wherein the second and third gears (22, 23) are connected in a rotationally fixed manner on the second rotation axis (AX2), • wherein the fifth gear (25) on the second rotation axis (AX2) is connected in a rotationally fixed manner to the countershaft (W3), • wherein the first element (P11) of the planetary gear set (P1) is connected in a rotationally fixed manner to the first transmission input shaft (W1), • wherein the third element (P13) of the planetary gear set (P1) is connected in a rotationally fixed manner to the second transmission input shaft (W2). [6] Method for setting gears and EDS shift modes for a transmission (1) according to claim 5, • wherein in a first gear, the first switching element (B3), the second switching element (C3) and the sixth switching element (F3) are closed and the fourth switching element (D3), the fifth switching element (E3) and the third switching element (H3) are open, • to initiate an EDS2 shift mode from the first gear, the first shift element (B3) is first opened, then the fifth shift element (E3) is closed and then the sixth shift element (F3) is opened, to initiate a second gear from this EDS2 shift mode, the first shift element (B3) is closed, • in second gear, the first switching element (B3), the second switching element (C3) and the fifth switching element (E3) are closed and the fourth switching element (D3), the third switching element (H3) and the sixth switching element (F3) are open, • to initiate an EDS3 shift mode from the second gear, the second shift element (C3) is first opened, then the fourth shift element (D3) is closed and then the fifth shift element (E3) is opened, to initiate a third gear from this EDS3 shift mode, the second shift element (C3) is closed, • in third gear, the first switching element (B3), the second switching element (C3) and the fourth switching element (D3) are closed and the third switching element (H3), the fifth switching element (E3) and the sixth switching element (F3) are open, • wherein to initiate an EDS4 shift mode from the third gear, the second shift element (C3) is opened, wherein to initiate a fourth gear, first the third shift element (H3) is closed, then the fourth shift element (D3) is opened and then the second shift element (C3) is closed, • wherein in fourth gear the first switching element (B3), the second switching element (C3) and the third switching element (H3) are closed and the fourth switching element (D3), the fifth switching element (E3) and the sixth switching element (F3) are open. [7] Transmission (1) for a drive train of a vehicle, comprising • a first transmission input shaft (W1) arranged on a first rotational axis (AX1) for connecting a first electric machine (EM1), • a second transmission input shaft (W2) arranged on the first rotation axis (AX1) for connecting a second electric machine (EM2), • at least one planetary gear set (P1) arranged on the first rotational axis (AX1) and connected to the two drive shafts (W1, W2) in a driving manner and designed as a superposition gear, with a first element (P11), a second element (P12) and a third element (P13), • a second rotational axis (AX2) arranged axially parallel to the first rotational axis (AX1) on which a countershaft (W3), a first gear (21), a second gear (22), a third gear (23) and a fourth gear (24) are arranged, • wherein the first gear (21) on the second rotational axis (AX2) meshes with a first gear (11) on the first rotational axis (AX1) and forms a first spur gear stage (ST1), • wherein the second gear (22) on the second rotational axis (AX2) meshes with a second gear (12) on the first rotational axis (AX1) and forms a second spur gear stage (ST2), • wherein the third gear (23) on the second rotational axis (AX2) meshes with a third gear (13) on the first rotational axis (AX1) and forms a third spur gear stage (ST3), • wherein the fourth gear (24) on the second rotational axis (AX2) meshes with a fourth gear (14) on the first rotational axis (AX1) and forms a fourth spur gear stage (ST4), • an output shaft (W4) arranged on the first rotation axis (AX1), • a first switching element (A4) which, in the closed state, connects the first and second gear wheels (11, 12) on the first rotation axis (AX1) in a rotationally fixed manner, • a second switching element (B4) which, in the closed state, connects the second and third gear wheels (12, 13) on the first rotation axis (AX1) in a rotationally fixed manner, • a third switching element (C4) which, in the closed state, connects the third gear (13) on the first rotation axis (AX1) to the second element (P12) of the planetary gear set (P1) in a rotationally fixed manner, • a fourth switching element (H4) which, when closed, connects the output shaft (W4) to the second element (P12) of the planetary gear set (P1) in a rotationally fixed manner, • a fifth switching element (D4) which, in the closed state, connects the third gear (23) on the second rotation axis (AX2) to the countershaft (W3) in a rotationally fixed manner, • a sixth switching element (E4) which, in the closed state, connects the second gear (22) on the second rotation axis (AX2) to the countershaft (W3) in a rotationally fixed manner, • a seventh switching element (F4) which, in the closed state, connects the first gear (21) on the second rotation axis (AX2) to the countershaft (W3) in a rotationally fixed manner, • wherein the first gear (11) is connected on the first rotation axis (AX1) to the third element (P13) of the planetary gear set (P1) in a rotationally fixed manner, • wherein the fourth gear (14) on the first rotation axis (AX1) is connected in a rotationally fixed manner to the output shaft (W4), • wherein the fourth gear (24) on the second rotation axis (AX2) is connected in a rotationally fixed manner to the countershaft (W3), • wherein the first element (P11) of the planetary gear set (P1) is connected in a rotationally fixed manner to the first transmission input shaft (W1), • wherein the third element (P13) of the planetary gear set (P1) is connected in a rotationally fixed manner to the second transmission input shaft (W2). [8] Method for setting gears and EDS shift modes for a transmission (1) according to claim 7, • wherein in a first gear, the first switching element (A4), the second switching element (B4), the third switching element (C4) and the seventh switching element (F4) are closed and the fourth switching element (H4), the fifth switching element (D4) and the sixth switching element (E4) are open, • to initiate an EDS2 shift mode from the first gear, the first shift element (A4) is first opened, then the sixth shift element (E4) is closed and then the seventh shift element (F4) is opened, to initiate a second gear from this EDS2 shift mode, the first shift element (A4) is closed, • in second gear, the first switching element (A4), the second switching element (B4), the third switching element (C4) and the sixth switching element (E4) are closed and the fourth switching element (H4), the fifth switching element (D4) and the seventh switching element (F4) are open, • to initiate an EDS3 shift mode from the second gear, the second shift element (B4) is first opened, then the fifth shift element (D4) is closed and then the sixth shift element (E4) is opened, to initiate a third gear from this EDS3 shift mode, the second shift element (B4) is closed, • in third gear, the first switching element (A4), the second switching element (B4), the third switching element (C4) and the fifth switching element (D4) are closed and the fourth switching element (H4), the sixth switching element (E4) and the seventh switching element (F4) are open, • to initiate an EDS4 shift mode from the third gear, the third shift element (C4) is first opened, then the fourth shift element (H4) is closed and then the fifth shift element (D4) is opened, to initiate a fourth gear from this EDS4 shift mode, the third shift element (C4) is closed, • wherein in fourth gear the first switching element (A4), the second switching element (B4), the third switching element (C4) and the fourth switching element (H4) are closed and the fifth switching element (D4), the sixth switching element (E4) and the seventh switching element (F4) are open. [9] Transmission (1) for a drive train of a vehicle, comprising • a first transmission input shaft (W1) arranged on a first rotational axis (AX1) for connecting a first electric machine (EM1), • a second transmission input shaft (W2) arranged on the first rotation axis (AX1) for connecting a second electric machine (EM2), • at least one planetary gear set (P1) arranged on the first rotational axis (AX1) and connected to the two drive shafts (W1, W2) in a driving manner and designed as a superposition gear, with a first element (P11), a second element (P12) and a third element (P13), • a second rotational axis (AX2) arranged axially parallel to the first rotational axis (AX1), on which a countershaft (W3), a first gear (21), a second gear (22) and a third gear (23) are arranged, • wherein the first gear (21) on the second rotational axis (AX2) meshes with a first gear (11) on the first rotational axis (AX1) and forms a first spur gear stage (ST1), • wherein the second gear (22) on the second rotational axis (AX2) meshes with a second gear (12) on the first rotational axis (AX1) and forms a second spur gear stage (ST2), • wherein the third gear (23) on the second rotational axis (AX2) meshes with a third gear (13) on the first rotational axis (AX1) and forms a third spur gear stage (ST3), • an output shaft (W4) arranged on the first rotation axis (AX1), • a first switching element (B5) which, in the closed state, connects the first and second gears (11, 12) on the first rotation axis (AX1) in a rotationally fixed manner, • a second switching element (C5) which, in the closed state, connects the second gear (12) on the first rotation axis (AX1) to the second element (P12) of the planetary gear set (P1) in a rotationally fixed manner, • a third switching element (H5) which, when closed, connects the output shaft (W4) to the second element (P12) of the planetary gear set (P1) in a rotationally fixed manner, • a fourth switching element (D5) which, in the closed state, connects the second gear (22) on the second rotation axis (AX2) to the countershaft (W3) in a rotationally fixed manner, • a fifth switching element (E5) which, in the closed state, connects the first gear (21) on the second rotation axis (AX2) to the countershaft (W3) in a rotationally fixed manner, • wherein the first gear (11) is connected on the first rotation axis (AX1) to the third element (P13) of the planetary gear set (P1) in a rotationally fixed manner, • wherein the third gear (13) on the first rotation axis (AX1) is connected in a rotationally fixed manner to the output shaft (W4), • wherein the third gear (23) on the second rotation axis (AX2) is connected in a rotationally fixed manner to the countershaft (W3), • wherein the first element (P11) of the planetary gear set (P1) is connected in a rotationally fixed manner to the first transmission input shaft (W1), • wherein the third element (P13) of the planetary gear set (P1) is connected in a rotationally fixed manner to the second transmission input shaft (W2). [10] Method for setting gears and EDS shift modes for a transmission (1) according to claim 9, • wherein in a first gear the first switching element (B5), the second switching element (C5) and the fifth switching element (E5) are closed and the third switching element (H5) and the fourth switching element (D5) are open, • to initiate an EDS2 shift mode from the first gear, the first shift element (B5) is first opened, then the fourth shift element (D5) is closed and then the fifth shift element (E5) is opened, to initiate a second gear from this EDS2 shift mode, the first shift element (B5) is closed, • in second gear, the first switching element (B5), the second switching element (C5) and the fourth switching element (D5) are closed and the third switching element (H5) and the fifth switching element (E5) are open, • to initiate an EDS3 shift mode from the second gear, the second shift element (C5) is first opened, then the third shift element (H5) is closed and then the fourth shift element (D5) is opened, to initiate a third gear from this EDS3 shift mode, the second shift element (C5) is closed, • wherein in third gear the first switching element (B5), the second switching element (C5) and the third switching element (H5) are closed and the fourth switching element (D5) and the fifth switching element (E5) are open.

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