| 摘要 |
The invention relates to a multi-step reduction gear, comprising a drive shaft (1), which is connected to a front-mounted gear group (VS), an output shaft (3), which is connected to a rear-mounted gear group (NS), switch elements (A, B, C, D, E) acting on the front-mounted gear group (VS) and switch elements (M, H, L) acting on the rear-mounted gear group (NS). By selectively switching said switch elements (A, B, C, D, E and M, H, L) an input speed (n) of the drive shaft (1) can be transmitted to the output shaft (3) for the purpose of shifting at least seven forward gears in such a way that in order to change from one gear to the next highest or next lowest gear the switch elements that have just been actuated only disconnect one switch element and connect one further switch element. Pursuant to the invention it is suggested to design the front-mounted gear group (VS) from two coupled, shiftable front-mounted planetary gear sets (VS1, VS2) and a maximum of two further non-shiftable front-mounted planetary gear sets (VSA, VSb), wherein the rear-mounted gear group (NS) is firmly connected to the front-mounted gear group (VS) by means of a spacer shaft (2) rotating at an output speed (nvs) of the front-mounted gear group (VS) and can be connected to the drive shaft (1) by means of at least one second switch element (H) acting on the rear-mounted gear group (NS), and wherein the output speed (nvs) of the front-mounted gear group (VS) is generated by selectively closing switch elements (A, B, C, D, E) acting on the front-mounted gear group (VS).
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