A power transmission mechanism includes a first pinion gear meshed with a first sun gear coupled to a first output shaft; a second pinion gear meshed with a second sun gear coupled to a second output shaft and meshed with the first pinion gear; a differential case coupled to an input shaft and supporting the first and second pinion gears; an internal gear rotatable about the axes of the first and second output shafts; a motor generator coupled to the internal gear; a first one-way clutch including a first inner ring member configured to move in conjunction with the first pinion gear and a first outer ring member meshed with the internal gear; and a second one-way clutch including a second inner ring member configured to move in conjunction with the second pinion gear and a second outer ring member meshed with the internal gear.

The present invention is a powertrain for a hybrid vehicle, comprising a driving/receiving machine (20), a thermal engine (10) and engine shaft (12), a speed variation device (14) including an engine epicyclic gear train (24) with a sun gear (34) and a crown (42) which are each connected to the engine shaft (12) by an engine controlled coupling (26, 28) and to a fixed part (40) of the powertrain by a one-way automatic coupling (30, 32). A planet gear carrier (46) and a machine epicyclic gear train (60) are arranged on a shaft (62) substantially parallel to engine shaft (12). The planet gear carrier comprises a sun gear (64), a crown (72), a planet gear carrier (68) and an epicyclic gear train controlled coupling (88). The speed variation device (14) comprises a device (94) for connecting/disconnecting electric machine (20) with machine epicyclic gear train (60).

A control process including the following steps is executed. The control process includes, at the time of switching from series-parallel mode to series mode, a step of reducing an engine torque, a step of releasing a clutch, a step of reducing a reaction torque of a first rotary electric machine and a step of increasing a torque of a second rotary electric machine, and, when synchronization is started and a step of increasing a positive torque of the first MG, a step of starting engagement of a clutch, and, when a rotation speed of the first rotary electric machine and a rotation speed of an engine are synchronous with each other, a step of engaging the clutch.

Methods and systems for an electric axle assembly are provided herein. The electric axle assembly includes, in one example, an electric machine with a rotor shaft having an output gear thereon. The electric axle assembly further includes a planetary gearset with a carrier coupled to a pair of axle shafts, a first ring gear with external teeth that are rotationally coupled to the output gear; and a sun gear meshing with a plurality of planet gears that rotate on the carrier, where, in the axle assembly, internal teeth of the ring gear are rotationally coupled to the plurality of planet gears, and where, in the axle assembly, the sun gear or the carrier are grounded by a housing of the electric axle assembly.

A drive arrangement of a working machine to be driven at a variably adjustable speed includes a differential gear, a first drive unit coupled to a first element of the differential gear, a working machine coupled to a second element of the differential gear, and a second drive unit coupled to a third element of the differential gear. The speed of the second drive unit can be superimposed on a speed dependent on the speed of the first drive unit, whereby the first or second drive unit can be driven at a variably adjustable speed. The drive arrangement includes an auxiliary gear stage and a switching element interacting with the auxiliary gear stage, wherein, when the switching element is closed, the auxiliary gear stage is load-transmitting and the speeds of the first and second drive units are coupled as a function of at least one transmission ratio of the auxiliary gear stage, and when the switching element is open, the auxiliary gear stage is load-free and the speeds of the first and second drive units are decoupled.

A power transmission apparatus of a hybrid electric vehicle includes an input shaft configured of receiving an engine torque, a motor shaft configured of receiving a torque of a motor/generator, first and second planetary gear sets respectively having first to third rotation elements and fourth to sixth rotation elements, a first shaft connected to the first rotation element and selectively connectable to each of the input shaft and the motor shaft, a second shaft fixedly connecting the second and fifth rotation elements, and selectively connectable to the input shaft, the motor shaft, and a transmission housing, respectively, a third shaft fixedly connecting the third and fourth rotation elements and selectively connectable to the transmission housing, a fourth shaft fixedly connecting the sixth rotation element and an output gear, and a plurality of engagement elements including at least one clutch and at least one brake.

This gear speed change device is provided with an input unit 13 in which an eccentric guide portion 14 is formed centered about an eccentric position x1, on an input shaft 11 having an axial center x, an internal/external gear 20 which has external teeth 18 and internal teeth 19 having the center of rotation at the eccentric position x1, and one side of which is rotatably held by the eccentric guide portion 14, an output unit 24 which has an output shaft 12 on the axis x and on one side of which are formed internal teeth 22 that mesh with the external teeth 18 and that are centered about the axis x, and a rotation control unit 25 for controlling the rotational speed of the output unit 24.

A transmission (2) of a motor vehicle includes a first input shaft (7) for a first prime mover (3), a second input shaft (8) for a second prime mover (4), and an output shaft (9). A first sub-transmission (5) includes the first input shaft and a countershaft (11) coupled to the first input shaft (7) via a constant ratio. Gearwheels (16, 17, 18) are arranged on the countershaft, which mesh exclusively into gearwheels (12, 13, 15) arranged coaxially to the first input shaft (7). At least some of these gearwheels mesh into gearwheels (20, 21) arranged on the output shaft (9). Shift elements (A, B, C, D) are associated with the first input shaft (7) as well as with the countershaft (11), which provide either a gear with a first number of instances of gearwheel meshing or a winding-path gear with a second number of instances of gearwheel meshing. A second sub-transmission (6) includes the second input shaft (8), which is designed as a planetary transmission. A ring gear (22) forms the second input shaft (8), and a carrier (23) is coupled to the output shaft (9) via a gearwheel (14) arranged coaxially to the first input shaft (7). Shift elements (F, E) are associated with the planetary transmission, via which a sun gear (24) is fixedly connectable to the housing or the planetary transmission is bringable into direct drive. A sub-transmission coupling of the sub-transmissions is providable via one of the shift elements (A) associated with the countershaft.

A vehicle powertrain comprising a first and second electric machines, and a transmission arranged to transmit torque from said electric machines to a driving axle, the transmission comprising: first and second input shafts arranged to be driven by the machines, respectively, a common output shaft, a first gear set comprising:
first and second input gears via which torque is transmittable from the respective input shafts, to the output shaft; a second gear set comprising:
third and fourth input gears via which torque is transmittable from the respective input shafts to the output shaft; means for disconnecting each machine from each other and from the output shaft; an intermediate shaft drivable by the first and/or the second input gear; and an auxiliary gear set having two gear ratios arranged between the intermediate and common output shafts, at least the first gear set being arranged to drive the output shaft via the intermediate shaft and the auxiliary gear set.

An electromechanical power-split system and a method of operating thereof is provided, with a mechanical drive branch including an internal combustion engine (3), and with an electric drive branch including a first motor-generator block (59) including a first motor-generator (1) and a second motor-generator block (60) including a second motor-generator (2), the first motor-generator (1) is connectable to the internal combustion engine (3) and to the second motor-generator (2). The system includes a planetary gearset (4) with dual planet gears (46) and four input/output members for altering the flow ratio of the mechanical and electric drive branch . Each dual planet gear (46) is connected to the four input/output members, which are a first pair of input/output members formed by a first sun gear (41) and a ring gear (44), and a second pair of input/output members formed by a second sun gear (143) and a planet carrier (45).