Multi-step automatic gearbox

A multi-stage automatic transmission comprising:

• a drive input shaft (AN),
• a drive output shaft (AB), and
• a transmission housing (GG);
• a transfer gearset (VS) of a double planetary gearset design comprising a sun gear (SO_VS), a ring gear (HO_VS), a coupled carrier (ST_VS) rotatably supporting inner planetary gears (P1_VS) and outer planetary gears (P2_VS);
• a main gearset (HS) of a three-carrier, five-shaft coupled planetary gearset reduction transmission design comprising first, second and third sun gears (S1_HS, S2_HS, S3_HS), a coupled ring gear (H13_HS), a second ring gear (H2_HS), a coupled carrier (ST13_HS) rotatably supporting longer planetary gears (P13_HS), a second carrier (ST2_HS) rotatably supporting shorter planetary gears (P2_HS), a plurality of uncoupled input elements and an output element;
• and
• at least first, second, third, fourth, fifth and sixth shift elements (A, B, C, D, E, F) and each of the first shift element (A), the second shift element (B), the third shift element (C), the fourth shift element (D), the fifth shift element (E) and the sixth shift element (F) having an input element (120, 220, 320, 420, 520, 620) and an output element (130, 230, 330, 430, 530, 630);
• an output element of the transfer gearset (VS) rotates at a rotational speed slower than a rotational speed of the drive input shaft (AN);
• an input element of the transfer gearset (VS) is fixed to the drive input shaft (AN);
• the output element of the main gearset (HS) is permanently connected to the drive output shaft (AB);
• the input element (120) of the first shift element (A) is connected to the output element of the transfer gearset (VS);
• the output element (130) of the first shift element (A) is connected to a second input element of the main gearset (HS);
• the input element (220) of the second shift element (B) is connected to the output element of the transfer gearset (VS);
• the output element (230) of the second shift element (B) is connected to a first input element of the main gearset (HS);
• the input element (320) of the third shift element (C) is connected to the transmission housing (GG);
• the output element (330) of the third shift element (C) is connected to one of the first input element of the main gearset (HS) and another input element of the main gearset (HS) which is close to the first input element of the main gearset (HS);
• the input element (420) of the fourth shift element (D) is connected to the transmission housing (GG);
• the output element (430) of the fourth shift element (D) is connected to a third input element of the main gearset (HS);
• the input element (520) of the fifth shift element (E) is connected to the drive input shaft (AN);
• the output element (530) of the fifth shift element (E) is connected to the third input element of the main gearset (HS);
• the input element (620) of the sixth shift element (F) is connected to the drive input shaft (AN);
• the output element (630) of the sixth shift element (F) is connected to one of the first input element of the main gearset (HS) and another input element of the main gearset (HS) which is close to the first input element of the main gearset (HS);
• the fifth shift element (E) and the sixth shift element (F) form a structural group comprising a disk carrier (ZYLEF) common to both the fifth shift element (E) and the sixth shift element (F), a disk set (500) coupled to the fifth shift element (E), a disk set (600) coupled to the sixth shift element (F), a servomechanism (510) for the fifth shift element (E) to actuate the disk set (500) of the fifth shift element (E) and a servomechanism (610) for the sixth shift element (F) to actuate the disk set (600) of the sixth shift elements (F);
• the inner planetary gears (P1_VS) of the transfer gearset (VS) engage the sun gear (SO_VS) of the transfer gearset (VS) and the outer planetary gears (P2_VS) of the transfer gearset (VS);
• the outer planetary gears (P2_VS) of the transfer gearset (VS) engage the inner planetary gears (P1_VS) of the transfer gearset (VS) and the ring gear (HO_VS) of the transfer gearset (VS);
• the coupled carrier (ST_VS) of the transfer gearset (VS) is the input element of the transfer gearset (VS);
• the ring gear (HO_VS) of the transfer gearset (VS) is the output element of the transfer gearset (VS) and is connectable to at least one of the plurality input elements of the main gearset (HS);
• the sun gear (SO_VS) of the transfer gearset (VS) is fixed on the transmission housing (GG);
• the first sun gear (S1_HS) of the main gearset (HS) is axially located between the second sun gear (S2_HS) of the main gearset (HS) and the third sun gear (S3_HS) of the main gearset (HS);
• the longer planetary gears (P13_HS) of the main gearset (HS) engage the coupled ring gear (H13_HS) of the main gearset (HS), the first sun gear (S113 HS) of the main gearset (HS) and the third sun gear (S3_HS) of the main gearset (HS);
• the shorter planetary gears (P2_HS) of the main gearset (HS) engage the second ring gear (H2_HS) of the main gearset (HS) and the second sun gear (S2_HS) of the main gearset (HS);
• the first sun gear (S1_HS) of the main gearset (HS) is fixed to the second sun gear (S2_HS) of the main gearset (HS) to form the first input element of the main gearset (HS);
• the second ring gear (H2_HS) of the main gearset (HS) is the second input element of the main gearset (HS);
• the coupled carrier (ST13_HS) of the main gearset (HS) is the third input element of the main gearset (HS);
• the third sun gear (S3_HS) of the main gearset (HS) forms a fourth input element of the main gearset (HS) and is connected to the output element (330) of the third shift element (C) and the output element (630) of the sixth shift element (F);
• and
• the coupled ring gear (H13_HS) of the main gearset (HS) is fixed to the second carrier (ST2_HS) of the main gearset (HS) to form the output element of the main gearset (HS).