Hybrid power train for a motor vehicle

A hybrid powertrain for a motor vehicle, comprising

• a combustion engine;
• a first electric motor;
• and
• a transmission, comprising:
• an input shaft;
• an output shaft;
• a first and a second power path between the input shaft and a driving gear set, having a first gear ratio;
• a second power path between the input shaft and the driving gear set, having a second gear ratio smaller than the first gear ratio;
• the driving gear set comprising
• a first planetary gear set and
• a second planetary gear set,
• the first planetary gear set and the second planetary gear set having a plurality of shafts capable of being connected to the electric motor, the plurality of shafts comprising:
• a first shaft, capable of being fixed by a first gear-shifting element and being connected by a gear-shifting element to the first power path;
• a second shaft, capable of being connected to the first power path by a third gear-shifting element and to the second power path by a fourth gear-shifting element;
• a third shaft, being connected to the output shaft;
• and
• a fourth shaft, capable to being connected to the second power path by a fifth gear-shifting element and fixed by a sixth gear-shifting element,
• wherein the rotational speed of each of the plurality of shafts varies linearly with the rotational speed of each other of the plurality of shafts such that:
• for a positive linear relation, the second shaft is configured to operate at a second-shaft rotational speed that is greater than or equal to a rotational speed of the first shaft, the third shaft is configured to operate at a third-shaft rotational speed that is greater than or equal to the second-shaft rotational speed, and the fourth shaft is configured to operate at a fourth-shaft rotational speed that is greater than or equal to the third-shaft rotational speed;
• and
• for a negative linear relation, the second-shaft rotational speed is less than or equal to the rotational speed of the first shaft, the third-shaft rotational speed is less than or equal to the second-shaft rotational speed, and the fourth-shaft rotational speed is less than or equal to the third-shaft rotational speed.

A transmission comprising:

• an input shaft;
• an output shaft;
• an electric motor;
• and
• a driving gear set comprising:
• a first planetary gear set,
• a second planetary gear set adjacent to the first planetary gear set, the first and second gear sets comprising:
• a first shaft connected to the electric motor and capable of being fixed by a first gear-shift element and capable of being connected to a first power path via a second gear-shift element;
• a second shaft connected to an internal ring gear of the second planetary gear set, wherein the second shaft is coaxial with the first shaft, wherein the second shaft is capable of being connected to the first power path via a third gear shifting element and capable of being connected to a second power path via a fourth shifting element;
• a third shaft connected to the output shaft, an internal ring gear of the first planetary gear set, and a planet carrier of the second planetary gear set;
• and
• a fourth shaft connecting to a center gear of the second planetary gear set, capable of being connected to the second power path via a fifth gear-shifting element and capable of being fixed by a sixth gear-shifting element,
• wherein the rotational speed of the first shaft varies linearly with the rotational speed of the second shaft, the rotational speed of the third shaft, and the rotational speed of the fourth shaft, such that:
• the rotational speed of the fourth shaft is greater than or equal to the rotational speed of the third shaft, the rotational speed of the third shaft is greater than or equal to the rotational speed of the second shaft, and the rotational speed of the second shaft is greater than or equal to the rotational speed of the first shaft;
• or
• the rotational speed of the fourth shaft is less than or equal to the rotational speed of the third shaft, the rotational speed of the third shaft is less than or equal to the rotational speed of the second shaft, and the rotational speed of the second shaft is less than or equal to the rotational speed of the first shaft.