Drive system for a motor vehicle

A drive system for a motor vehicle having a drive shaft (6) and an associated starter and generator unit (1), the drive system having an electrical machine (8, 9) operable both as a starting motor, during a starting mode of operation, and as an electric generator, during a generator mode of operation, and a planetary drive (10) with at least one sun gear (16, 28), at least one planetary gear (17, 17′) and at least one internal gear (18, 27);

• wherein the electrical machine (8, 9) is connectable with the drive shaft (6) via the planetary drive (10), by means of at least one additional shaft (12, 13, 31), and at least one clutch (14, 15, 15′, 15″, 15′″, 29, 30, 32, 34, 36 to 41) to form a drive train such that, during the starting mode of operation, the drive train has a ratio i>1, and, during the generator mode of operation, the drive train has a ratio i=1;
• and the drive shaft (6) penetrates through a cover (4) and a seal is provided between the drive shaft (6) and the cover (4), and a housing (3) accommodates the starter and generator unit (1) and the housing (3), on a side facing a motor, is closed by the cover (4), and an opposite side of the housing (3) is connected to a vehicle transmission (2);
• the vehicle transmission (2) has a hydrodynamic torque converter (20), for reception of a converter bell (23) transmission housing, and the starter and generator unit (1) is placed between the torque converter (20) and an oil pump (24) on a side of the torque converter (20) proximal to the vehicle transmission (2).

A drive system for a motor vehicle having a drive shaft (6) and an associated starter and generator unit (1), the drive system having an electrical machine (8, 9) operable both as a starting motor, during a starting mode of operation, and as an electric generator, during a generator mode of operation, and a planetary drive (10) with at least one sun gear (16, 28), at least one planetary gear (17, 17′) and at least one internal gear (18, 27);

• wherein the electrical machine (8, 9) is connectable with the drive shaft (6) via the planetary drive (10), by means of at least one additional shaft (12, 13, 31), and at least one clutch (14, 15, 15′, 15″, 15′″, 29, 30, 32, 34, 36 to 41) to form a drive train such that, during the starting mode of operation, the drive train has a ratio i>1, and, during the generator mode of operation, the drive train has a ratio i=1;
• and the drive shaft (6) penetrates through a cover (4) and a seal is provided between the drive shaft (6) and the cover (4), and a housing (3) accommodates the starter and generator unit (1) and the housing (3), on a side facing a motor, is closed by the cover (4), an opposite side of the housing (3) is connected to a vehicle transmission (2);
• both the electrical machine (8, 9) and the planetary drive (10) are accommodated within a housing (3) without being separated from one another by a sealed partition, and the electrical machine (8, 9) and the planetary drive (10) are located radially with respect to one another.