Power split transmission and method to operate a power split transmission and powertrain

A power-split transmission (28) with a first power path and a second power path, wherein the first power path is a mechanical power path, and the power-split transmission comprising:

• an input shaft (12),
• an output shaft (16),
• a primary planetary gearset (P1) with a first primary sun gear (P111), a second primary sun gear (P112), a shared primary planetary carrier (P12) and at least one shared primary gearwheel (P13),
• a secondary planetary gearset (P2) with a secondary sun gear (P21), a secondary planetary carrier (P22) and at least one secondary ring gear (P24),
• a tertiary planetary gearset (P3) with a first tertiary planetary gearset element (P32),
• a first shifting element (S1), a second shifting element (S2), a third shifting element (S3), and a fourth shifting element (S4),
• the first primary sun gear (P111) being coupled, in a rotationally fixed manner, to the input shaft (12),
• the shared primary planetary carrier (P12) being rotationally fixedly connectable to the secondary sun gear (P21), via the first shifting element (S1),
• the second primary sun gear (P112) being rotationally fixedly connectable to the secondary sun gear (P21), via the second shifting element (S2),
• the shared primary planetary carrier (P12) being rotationally fixedly connectable to the secondary ring gear (P24), via the third shifting element (S3),
• the secondary ring gear (P24) being rotationally fixedly connectable to a transmission housing (44), via the fourth shifting element (S4),
• the secondary planetary carrier (P22) being rotationally fixedly coupled to the first tertiary planetary gearset element (P32), and
• the output shaft (16) being rotationally fixedly coupled to the first tertiary planetary gearset element (P32).

A method for operating a power-split transmission (28) which has first and second paths, the first power path is a mechanical power path, and the power-split transmission having an input shaft (12) and an output shaft (16), a primary planetary gearset (P1) with a first primary sun gear (P111), a second primary sun gear (P112), a shared primary planetary carrier (P12) and at least one shared primary gearwheel (P13), a secondary planetary gearset (P2) with a secondary sun gear (P21), a secondary planetary carrier (P22) and at least one secondary ring gear (P24), a tertiary planetary gearset (P3) with a first tertiary planetary gearset element (P32), first, second, third and fourth shifting elements (S1, S2, S3, S4), the first primary sun gear (P111) is coupled, in a rotationally fixed manner, to the input shaft (12), the shared primary planetary carrier (P12) is rotationally fixedly connectable to the secondary sun gear (P21), via the first shifting element (S1), the second primary sun gear (P112) is rotationally fixedly connectable to the secondary sun gear (P21), via the second shifting element (S2), the shared primary planetary carrier (P12) is rotationally fixedly connectable to the secondary ring gear (P24), via the third shifting element (S3), the secondary ring gear (P24) is rotationally fixedly connectable to a transmission housing (44), via the fourth shifting element (S4), the secondary planetary carrier (P22) is rotationally fixedly coupled to the first tertiary planetary gearset element (P32), and the output shaft (16) is rotationally fixedly coupled to the first tertiary planetary gearset element (P32), the method comprising:

• implementing a first forward traveling range by engagement of the first shifting element (S1) and the fourth shifting element (S4) and disengagement of all the other shifting elements,
• implementing a second forward traveling range by engagement of the second shifting element (S2) and the fourth shifting element (S4) and disengagement of all the other shifting elements,
• implementing a third forward traveling range by engagement of the third shifting element (S3) and the second shifting element (S2) and disengagement of all the other shifting elements,
• implementing a fourth forward traveling range by engagement of the second shifting element (S2) and a sixth shifting element (S6) and disengagement of all the other shifting elements,
• implementing a first reverse traveling range by engagement of the first shifting element (S1) and a fifth shifting element (S5) and disengagement of all the other shifting elements, and
• implementing a second reverse traveling range by engagement of the second shifting element (S2) and the fifth shifting element (S5) and disengagement of all the other shifting elements.

A drive-train (10) of a working machine having a power-split transmission power-split transmission (28) with a first power path and a second power path, wherein the first power path is a mechanical power path, and the power-split transmission comprising:

• an input shaft (12),
• an output shaft (16),
• a primary planetary gearset (P1) with a first primary sun gear (P111), a second primary sun gear (P112), a shared primary planetary carrier (P12), and at least one shared primary gearwheel (P13),
• a secondary planetary gearset (P2) with a secondary sun gear (P21), a secondary planetary carrier (P22), and at least one secondary ring gear (P24),
• a tertiary planetary gearset (P3) with a first tertiary planetary gearset element (P32),
• a first shifting element (S1), a second shifting element (S2), a third shifting element (S3), and a fourth shifting element (S4),
• the first primary sun gear (P111) being coupled, in a rotationally fixed manner, to the input shaft (12),
• the shared primary planetary carrier (P12) being rotationally fixedly connectable to the secondary sun gear (P21), via the first shifting element (S1),
• the second primary sun gear (P112) being rotationally fixedly connectable to the secondary sun gear (P21), via the second shifting element (S2),
• the shared primary planetary carrier (P12) being rotationally fixedly connectable to the secondary ring gear (P24), via the third shifting element (S3),
• the secondary ring gear (P24) being rotationally fixedly connectable to a transmission housing (44), via the fourth shifting element (S4),
• the secondary planetary carrier (P22) being rotationally fixedly coupled to the first tertiary planetary gearset element (P32), and
• the output shaft (16) being rotationally fixedly coupled to the first tertiary planetary gearset element (P32).