| US 7,549,942 B2 | ||
| Multi-speed transmission | ||
| Gerhard Gumpoltsberger, Friedrichshafen (Germany) | ||
| Assigned to ZF Friedrichshafen AG, Freidrichshafen (Germany) | ||
| Filed on Feb. 09, 2007, as Appl. No. 11/705,111. | ||
| Claims priority of application No. 10 2006 006 637 (DE), filed on Feb. 14, 2006. | ||
| Prior Publication US 2007/0207891 A1, Sep. 06, 2007 | ||
| Int. Cl. F16H 3/62 (2006.01); F16H 3/44 (2006.01) | ||
| U.S. Cl. 475—280 [475/276] | 21 Claims |
| 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 (1, 2, 3, 4, 5, 6, 7), as well as at least six control elements (03, 04, 05, 15, 17, 36), comprising first, second, and third brakes (03, 04, 05) and first, second, and third clutches (15, 17, 36), 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 a reverse gear can be implemented;
wherein the input shaft (1) is permanently connected to the carrier of the first planetary gear set (P1) and detachably connectable, via the first clutch (15), to the fifth shaft (5) and, via the second clutch (17), to the seventh shaft (7);
the output shaft (2) is permanently connected to the ring gear of the fourth planetary gear set (P4) and the carrier of the second planetary gear set (P2);
the third shaft (3) is permanently connected to the ring gear of the second planetary gear set (P2) and the carrier of the fourth planetary gear set (P4) and detachably connectable, 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 sun gear of the fourth planetary gear set (P4) and detachably connectable, via the second brake (04), to the housing (G);
the fifth shaft (5) is permanently connected to the carrier of the third planetary gear set (P3) and detachably connectable, via the third brake (05), to the housing (G);
the sixth shaft (6) is permanently connected to the ring gear of the first planetary gear set (P1) and the sun gear of the third planetary gear set (P3) and detachably connectable, via the third clutch (36), to the third shaft (3);
the seventh shaft (7) is permanently connected to the sun gear of the second planetary gear set (P2); and
the sun gear of the first planetary gear set (P1) is fixed to the housing (G).
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