×

Multistep reduction gear

  • US 6,960,149 B2
  • Filed: 03/27/2002
  • Issued: 11/01/2005
  • Est. Priority Date: 03/30/2001
  • Status: Expired due to Term
First Claim
Patent Images

1. 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),a plurality of switch elements (A, B, C, D, E) acting on the front-mounted gear group (VS); and

    first and second switch elements (M, H, L) acting on the rear-mounted gear group (NS), and by selectively switching said switch elements (A, B, C, D, E and M, H, L), acting on the front-mounted and rear-mounted gear groups (VS, NS), 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 (A, B, C, D, E and M, H, L, M), acting on the front-mounted and rear-mounted gear groups (VS, NS), that have just been actuated only disconnect one switch element and connect one further switch element, and the rear-mounted group (NS) can be connected to the drive shaft (1) via at least the second switch element (H) acting on the rear-mounted group (NS);

    wherein the front-mounted gear group (VS) is formed by first and second coupled, shiftable front-mounted planetary gear sets (VS1, VS2) and a maximum of two further non-shiftable front-mounted planetary gear sets (VSa, VSb), and the rear-mounted gear group (NS) is firmly connected to the front-mounted gear group (VS) by one spacer shaft (2) rotating at an output speed (nvs) of the front-mounted gear group (VS), with the spacer shaft not being connected to any one of the switch elements (A, B, C, D, E and M, H, L), acting on the front-mounted and rear-mounted gear groups (VS, NS), and the output speed (nvs) of the front-mounted gear group (VS) is generated by selectively engaging a maximum of two of the plurality switch elements (A, B, C, D, E) acting on the front-mounted gear group (VS).

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×