×

Multi-speed transmission

  • US 7,575,533 B2
  • Filed: 02/09/2007
  • Issued: 08/18/2009
  • Est. Priority Date: 02/14/2006
  • Status: Expired due to Fees
First Claim
Patent Images

1. A multi-speed automatic transmission of a planetary design for a motor vehicle, the transmission comprising:

  • an input shaft (1) and an output shaft (2) arranged in a housing (G);

    first, second, third, and fourth planetary gear sets (P1, P2, P3, P4), and each of the first, the second, the third, and the fourth planetary gear sets (P1, P2, P3, P4) comprising a sun gear, a carrier and a ring gear;

    at least third, fourth, fifth, sixth and seventh rotatable shafts (3, 4, 5, 6, 7) as well as at least six shifting elements (03, 04, 05, 14, 16, 26, 46, 57), comprising first, second, and third brakes (03, 04, 05) and first, second, and third, clutches (14, 16, 26, 48, 57), whose selective engagement creates different gear ratios between the input shaft (1) and the output shaft (2) so that at least nine forward gears and one reverse gear can be implemented;

    wherein the input shaft (1) is permanently connected to the sun gear of the second planetary gear set (P2) and the sun gear of the third planetary gear set (P3);

    the third shaft (3) is permanently connected to the carrier of the second planetary gear set (P2) and the ring gear of the first planetary gear set (P1), and is detachably connected, via the first brake (03), to the housing (G);

    the fourth shaft (4) is permanently connected to the ring gear of the third planetary gear set (P3) and the carrier of the fourth planetary gear set (P4), and is detachably connected, via the second brake (04), to the housing (G);

    the fifth shaft (5) is permanently connected to the sun gear of the fourth planetary gear set (P4) and the ring gear of the second planetary gear set (P2), and is detachably connected, via the third brake (05), to the housing (G), and, via the third clutch (57), to the seventh shaft (7);

    the seventh shaft (7) is permanently connected to the carrier of the first planetary gear set (P1);

    the sixth shaft (6) is permanently connected to the carrier of the third planetary gear set (P3) and detachably connected to the output shaft (2);

    the output shaft (2) is permanently connected to the ring gear of the fourth planetary gear set (P4);

    the sun gear of the first planetary gear set (P1) is fixed to the housing (G); and

    one of;

    the input shaft (1) is detachably connected, via the first clutch (14), to the fourth shaft (4);

    the input shaft (1) is detachably connected, via the first clutch (16), to the sixth shaft (6); and

    the fourth shaft (4) is detachably connected, via the first clutch (46), to the sixth shaft (6).

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