| 摘要 |
The invention relates to a multistep gear, comprising a drive shaft (1) linked with a front-mounted gear train (VS), an output shaft (2) linked with a rear-mounted gear train (NS), and maximally seven shift elements (A, B, C, D, E, D', A') through the selective shifting of which a least seven forward gears can be shifted without group shifts. The front-mounted gear train (VS) is formed by a front-mounted planetary gear (VS1) or maximally two non-shiftable front-mounted planetary gears (VS2) coupled with the first front-mounted planetary gear (VS1). The rear-mounted gear train (NS) is configured as a two-stage/four-shaft transmission with two shiftable rear-mounted planetary gears (NS1, NS2) and four free shafts. The first free shaft of said two-stage/four-shaft transmission is linked with the first shift element (A), the second free shaft with the second and third shift elements (B, C), the third free shaft with the fourth and fifth shift element (D, E) and the fourth free shaft with the output shaft (2). In order to provide a multistep gear with a total of six shift elements, the third free shaft or the first free shaft of the rear-mounted gear (NS) is additionally linked with a sixth shift element (D' or A'). In order to provide a multistep gear with a total of seven shift elements, the third free shaft is additionally linked with a sixth shift element (D') and the first free shaft is additionally linked with a seventh shift element (A').
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